diff options
63 files changed, 2026 insertions, 247 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 49d993cee512..aba657a9d3a6 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -9,7 +9,7 @@ config ARM select BUILDTIME_EXTABLE_SORT if MMU select CPU_PM if (SUSPEND || CPU_IDLE) select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU - select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI) + select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI) select GENERIC_CLOCKEVENTS_BROADCAST if SMP select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW @@ -1414,7 +1414,7 @@ config SMP depends on CPU_V6K || CPU_V7 depends on GENERIC_CLOCKEVENTS depends on HAVE_SMP - depends on MMU + depends on MMU || ARM_MPU select USE_GENERIC_SMP_HELPERS help This enables support for systems with more than one CPU. If you have @@ -1435,7 +1435,7 @@ config SMP config SMP_ON_UP bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)" - depends on SMP && !XIP_KERNEL + depends on SMP && !XIP_KERNEL && MMU default y help SMP kernels contain instructions which fail on non-SMP processors. @@ -1585,7 +1585,7 @@ config SCHED_HRTICK config THUMB2_KERNEL bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY - depends on CPU_V7 && !CPU_V6 && !CPU_V6K + depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K default y if CPU_THUMBONLY select AEABI select ARM_ASM_UNIFIED @@ -1707,6 +1707,14 @@ config HW_PERF_EVENTS Enable hardware performance counter support for perf events. If disabled, perf events will use software events only. +config SYS_SUPPORTS_HUGETLBFS + def_bool y + depends on ARM_LPAE + +config HAVE_ARCH_TRANSPARENT_HUGEPAGE + def_bool y + depends on ARM_LPAE + source "mm/Kconfig" config FORCE_MAX_ZONEORDER diff --git a/arch/arm/Kconfig-nommu b/arch/arm/Kconfig-nommu index 2cef8e13f9f8..aed66d5df7f1 100644 --- a/arch/arm/Kconfig-nommu +++ b/arch/arm/Kconfig-nommu @@ -28,7 +28,7 @@ config FLASH_SIZE config PROCESSOR_ID hex 'Hard wire the processor ID' default 0x00007700 - depends on !CPU_CP15 + depends on !(CPU_CP15 || CPU_V7M) help If processor has no CP15 register, this processor ID is used instead of the auto-probing which utilizes the register. @@ -50,3 +50,15 @@ config REMAP_VECTORS_TO_RAM Otherwise, say 'y' here. In this case, the kernel will require external support to redirect the hardware exception vectors to the writable versions located at DRAM_BASE. + +config ARM_MPU + bool 'Use the ARM v7 PMSA Compliant MPU' + depends on CPU_V7 + default y + help + Some ARM systems without an MMU have instead a Memory Protection + Unit (MPU) that defines the type and permissions for regions of + memory. + + If your CPU has an MPU then you should choose 'y' here unless you + know that you do not want to use the MPU. diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 1d41908d5cda..f2623b25ff9a 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -476,6 +476,13 @@ choice of the tiles using the RS1 memory map, including all new A-class core tiles, FPGA-based SMMs and software models. + config DEBUG_VEXPRESS_UART0_CRX + bool "Use PL011 UART0 at 0xb0090000 (Cortex-R compliant tiles)" + depends on ARCH_VEXPRESS && !MMU + help + This option selects UART0 at 0xb0090000. This is appropriate for + Cortex-R series tiles and SMMs, such as Cortex-R5 and Cortex-R7 + config DEBUG_VT8500_UART0 bool "Use UART0 on VIA/Wondermedia SoCs" depends on ARCH_VT8500 @@ -645,7 +652,8 @@ config DEBUG_LL_INCLUDE default "debug/tegra.S" if DEBUG_TEGRA_UART default "debug/ux500.S" if DEBUG_UX500_UART default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \ - DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1 + DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1 || \ + DEBUG_VEXPRESS_UART0_CRX default "debug/vt8500.S" if DEBUG_VT8500_UART0 default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1 default "mach/debug-macro.S" diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 1ba358ba16b8..3380c4f51757 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -59,6 +59,7 @@ comma = , # Note that GCC does not numerically define an architecture version # macro, but instead defines a whole series of macros which makes # testing for a specific architecture or later rather impossible. +arch-$(CONFIG_CPU_32v7M) :=-D__LINUX_ARM_ARCH__=7 -march=armv7-m -Wa,-march=armv7-m arch-$(CONFIG_CPU_32v7) :=-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a) arch-$(CONFIG_CPU_32v6) :=-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6,-march=armv5t -Wa$(comma)-march=armv6) # Only override the compiler option if ARMv6. The ARMv6K extensions are diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h index 05ee9eebad6b..a5fef710af32 100644 --- a/arch/arm/include/asm/assembler.h +++ b/arch/arm/include/asm/assembler.h @@ -136,7 +136,11 @@ * assumes FIQs are enabled, and that the processor is in SVC mode. */ .macro save_and_disable_irqs, oldcpsr +#ifdef CONFIG_CPU_V7M + mrs \oldcpsr, primask +#else mrs \oldcpsr, cpsr +#endif disable_irq .endm @@ -150,7 +154,11 @@ * guarantee that this will preserve the flags. */ .macro restore_irqs_notrace, oldcpsr +#ifdef CONFIG_CPU_V7M + msr primask, \oldcpsr +#else msr cpsr_c, \oldcpsr +#endif .endm .macro restore_irqs, oldcpsr @@ -229,7 +237,14 @@ #endif .endm -#ifdef CONFIG_THUMB2_KERNEL +#if defined(CONFIG_CPU_V7M) + /* + * setmode is used to assert to be in svc mode during boot. For v7-M + * this is done in __v7m_setup, so setmode can be empty here. + */ + .macro setmode, mode, reg + .endm +#elif defined(CONFIG_THUMB2_KERNEL) .macro setmode, mode, reg mov \reg, #\mode msr cpsr_c, \reg diff --git a/arch/arm/include/asm/cp15.h b/arch/arm/include/asm/cp15.h index 1f3262e99d81..a524a23d8627 100644 --- a/arch/arm/include/asm/cp15.h +++ b/arch/arm/include/asm/cp15.h @@ -23,6 +23,11 @@ #define CR_RR (1 << 14) /* Round Robin cache replacement */ #define CR_L4 (1 << 15) /* LDR pc can set T bit */ #define CR_DT (1 << 16) +#ifdef CONFIG_MMU +#define CR_HA (1 << 17) /* Hardware management of Access Flag */ +#else +#define CR_BR (1 << 17) /* MPU Background region enable (PMSA) */ +#endif #define CR_IT (1 << 18) #define CR_ST (1 << 19) #define CR_FI (1 << 21) /* Fast interrupt (lower latency mode) */ diff --git a/arch/arm/include/asm/cputype.h b/arch/arm/include/asm/cputype.h index 7652712d1d14..3b704dfb6c58 100644 --- a/arch/arm/include/asm/cputype.h +++ b/arch/arm/include/asm/cputype.h @@ -8,8 +8,25 @@ #define CPUID_CACHETYPE 1 #define CPUID_TCM 2 #define CPUID_TLBTYPE 3 +#define CPUID_MPUIR 4 #define CPUID_MPIDR 5 +#ifdef CONFIG_CPU_V7M +#define CPUID_EXT_PFR0 0x40 +#define CPUID_EXT_PFR1 0x44 +#define CPUID_EXT_DFR0 0x48 +#define CPUID_EXT_AFR0 0x4c +#define CPUID_EXT_MMFR0 0x50 +#define CPUID_EXT_MMFR1 0x54 +#define CPUID_EXT_MMFR2 0x58 +#define CPUID_EXT_MMFR3 0x5c +#define CPUID_EXT_ISAR0 0x60 +#define CPUID_EXT_ISAR1 0x64 +#define CPUID_EXT_ISAR2 0x68 +#define CPUID_EXT_ISAR3 0x6c +#define CPUID_EXT_ISAR4 0x70 +#define CPUID_EXT_ISAR5 0x74 +#else #define CPUID_EXT_PFR0 "c1, 0" #define CPUID_EXT_PFR1 "c1, 1" #define CPUID_EXT_DFR0 "c1, 2" @@ -24,6 +41,7 @@ #define CPUID_EXT_ISAR3 "c2, 3" #define CPUID_EXT_ISAR4 "c2, 4" #define CPUID_EXT_ISAR5 "c2, 5" +#endif #define MPIDR_SMP_BITMASK (0x3 << 30) #define MPIDR_SMP_VALUE (0x2 << 30) @@ -79,7 +97,23 @@ extern unsigned int processor_id; __val; \ }) -#else /* ifdef CONFIG_CPU_CP15 */ +#elif defined(CONFIG_CPU_V7M) + +#include <asm/io.h> +#include <asm/v7m.h> + +#define read_cpuid(reg) \ + ({ \ + WARN_ON_ONCE(1); \ + 0; \ + }) + +static inline unsigned int __attribute_const__ read_cpuid_ext(unsigned offset) +{ + return readl(BASEADDR_V7M_SCB + offset); +} + +#else /* ifdef CONFIG_CPU_CP15 / elif defined (CONFIG_CPU_V7M) */ /* * read_cpuid and read_cpuid_ext should only ever be called on machines that @@ -106,7 +140,14 @@ static inline unsigned int __attribute_const__ read_cpuid_id(void) return read_cpuid(CPUID_ID); } -#else /* ifdef CONFIG_CPU_CP15 */ +#elif defined(CONFIG_CPU_V7M) + +static inline unsigned int __attribute_const__ read_cpuid_id(void) +{ + return readl(BASEADDR_V7M_SCB + V7M_SCB_CPUID); +} + +#else /* ifdef CONFIG_CPU_CP15 / elif defined(CONFIG_CPU_V7M) */ static inline unsigned int __attribute_const__ read_cpuid_id(void) { diff --git a/arch/arm/include/asm/glue-cache.h b/arch/arm/include/asm/glue-cache.h index ea289e1435e7..c81adc08b3fb 100644 --- a/arch/arm/include/asm/glue-cache.h +++ b/arch/arm/include/asm/glue-cache.h @@ -117,10 +117,37 @@ # endif #endif +#if defined(CONFIG_CPU_V7M) +# ifdef _CACHE +# define MULTI_CACHE 1 +# else +# define _CACHE nop +# endif +#endif + #if !defined(_CACHE) && !defined(MULTI_CACHE) #error Unknown cache maintenance model #endif +#ifndef __ASSEMBLER__ +extern inline void nop_flush_icache_all(void) { } +extern inline void nop_flush_kern_cache_all(void) { } +extern inline void nop_flush_kern_cache_louis(void) { } +extern inline void nop_flush_user_cache_all(void) { } +extern inline void nop_flush_user_cache_range(unsigned long a, + unsigned long b, unsigned int c) { } + +extern inline void nop_coherent_kern_range(unsigned long a, unsigned long b) { } +extern inline int nop_coherent_user_range(unsigned long a, + unsigned long b) { return 0; } +extern inline void nop_flush_kern_dcache_area(void *a, size_t s) { } + +extern inline void nop_dma_flush_range(const void *a, const void *b) { } + +extern inline void nop_dma_map_area(const void *s, size_t l, int f) { } +extern inline void nop_dma_unmap_area(const void *s, size_t l, int f) { } +#endif + #ifndef MULTI_CACHE #define __cpuc_flush_icache_all __glue(_CACHE,_flush_icache_all) #define __cpuc_flush_kern_all __glue(_CACHE,_flush_kern_cache_all) diff --git a/arch/arm/include/asm/glue-df.h b/arch/arm/include/asm/glue-df.h index b6e9f2c108b5..6b70f1b46a6e 100644 --- a/arch/arm/include/asm/glue-df.h +++ b/arch/arm/include/asm/glue-df.h @@ -95,6 +95,14 @@ # endif #endif +#ifdef CONFIG_CPU_ABRT_NOMMU +# ifdef CPU_DABORT_HANDLER +# define MULTI_DABORT 1 +# else +# define CPU_DABORT_HANDLER nommu_early_abort +# endif +#endif + #ifndef CPU_DABORT_HANDLER #error Unknown data abort handler type #endif diff --git a/arch/arm/include/asm/glue-proc.h b/arch/arm/include/asm/glue-proc.h index ac1dd54724b6..f2f39bcf7945 100644 --- a/arch/arm/include/asm/glue-proc.h +++ b/arch/arm/include/asm/glue-proc.h @@ -230,6 +230,15 @@ # endif #endif +#ifdef CONFIG_CPU_V7M +# ifdef CPU_NAME +# undef MULTI_CPU +# define MULTI_CPU +# else +# define CPU_NAME cpu_v7m +# endif +#endif + #ifndef MULTI_CPU #define cpu_proc_init __glue(CPU_NAME,_proc_init) #define cpu_proc_fin __glue(CPU_NAME,_proc_fin) diff --git a/arch/arm/include/asm/hugetlb-3level.h b/arch/arm/include/asm/hugetlb-3level.h new file mode 100644 index 000000000000..d4014fbe5ea3 --- /dev/null +++ b/arch/arm/include/asm/hugetlb-3level.h @@ -0,0 +1,71 @@ +/* + * arch/arm/include/asm/hugetlb-3level.h + * + * Copyright (C) 2012 ARM Ltd. + * + * Based on arch/x86/include/asm/hugetlb.h. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef _ASM_ARM_HUGETLB_3LEVEL_H +#define _ASM_ARM_HUGETLB_3LEVEL_H + + +/* + * If our huge pte is non-zero then mark the valid bit. + * This allows pte_present(huge_ptep_get(ptep)) to return true for non-zero + * ptes. + * (The valid bit is automatically cleared by set_pte_at for PROT_NONE ptes). + */ +static inline pte_t huge_ptep_get(pte_t *ptep) +{ + pte_t retval = *ptep; + if (pte_val(retval)) + pte_val(retval) |= L_PTE_VALID; + return retval; +} + +static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t pte) +{ + set_pte_at(mm, addr, ptep, pte); +} + +static inline void huge_ptep_clear_flush(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep) +{ + ptep_clear_flush(vma, addr, ptep); +} + +static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, + unsigned long addr, pte_t *ptep) +{ + ptep_set_wrprotect(mm, addr, ptep); +} + +static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, + unsigned long addr, pte_t *ptep) +{ + return ptep_get_and_clear(mm, addr, ptep); +} + +static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, + pte_t pte, int dirty) +{ + return ptep_set_access_flags(vma, addr, ptep, pte, dirty); +} + +#endif /* _ASM_ARM_HUGETLB_3LEVEL_H */ diff --git a/arch/arm/include/asm/hugetlb.h b/arch/arm/include/asm/hugetlb.h new file mode 100644 index 000000000000..1f1b1cd112f3 --- /dev/null +++ b/arch/arm/include/asm/hugetlb.h @@ -0,0 +1,84 @@ +/* + * arch/arm/include/asm/hugetlb.h + * + * Copyright (C) 2012 ARM Ltd. + * + * Based on arch/x86/include/asm/hugetlb.h + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef _ASM_ARM_HUGETLB_H +#define _ASM_ARM_HUGETLB_H + +#include <asm/page.h> +#include <asm-generic/hugetlb.h> + +#include <asm/hugetlb-3level.h> + +static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb, + unsigned long addr, unsigned long end, + unsigned long floor, + unsigned long ceiling) +{ + free_pgd_range(tlb, addr, end, floor, ceiling); +} + + +static inline int is_hugepage_only_range(struct mm_struct *mm, + unsigned long addr, unsigned long len) +{ + return 0; +} + +static inline int prepare_hugepage_range(struct file *file, + unsigned long addr, unsigned long len) +{ + struct hstate *h = hstate_file(file); + if (len & ~huge_page_mask(h)) + return -EINVAL; + if (addr & ~huge_page_mask(h)) + return -EINVAL; + return 0; +} + +static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm) +{ +} + +static inline int huge_pte_none(pte_t pte) +{ + return pte_none(pte); +} + +static inline pte_t huge_pte_wrprotect(pte_t pte) +{ + return pte_wrprotect(pte); +} + +static inline int arch_prepare_hugepage(struct page *page) +{ + return 0; +} + +static inline void arch_release_hugepage(struct page *page) +{ +} + +static inline void arch_clear_hugepage_flags(struct page *page) +{ + clear_bit(PG_dcache_clean, &page->flags); +} + +#endif /* _ASM_ARM_HUGETLB_H */ diff --git a/arch/arm/include/asm/irqflags.h b/arch/arm/include/asm/irqflags.h index 1e6cca55c750..3b763d6652a0 100644 --- a/arch/arm/include/asm/irqflags.h +++ b/arch/arm/include/asm/irqflags.h @@ -8,6 +8,16 @@ /* * CPU interrupt mask handling. */ +#ifdef CONFIG_CPU_V7M +#define IRQMASK_REG_NAME_R "primask" +#define IRQMASK_REG_NAME_W "primask" +#define IRQMASK_I_BIT 1 +#else +#define IRQMASK_REG_NAME_R "cpsr" +#define IRQMASK_REG_NAME_W "cpsr_c" +#define IRQMASK_I_BIT PSR_I_BIT +#endif + #if __LINUX_ARM_ARCH__ >= 6 static inline unsigned long arch_local_irq_save(void) @@ -15,7 +25,7 @@ static inline unsigned long arch_local_irq_save(void) unsigned long flags; asm volatile( - " mrs %0, cpsr @ arch_local_irq_save\n" + " mrs %0, " IRQMASK_REG_NAME_R " @ arch_local_irq_save\n" " cpsid i" : "=r" (flags) : : "memory", "cc"); return flags; @@ -129,7 +139,7 @@ static inline unsigned long arch_local_save_flags(void) { unsigned long flags; asm volatile( - " mrs %0, cpsr @ local_save_flags" + " mrs %0, " IRQMASK_REG_NAME_R " @ local_save_flags" : "=r" (flags) : : "memory", "cc"); return flags; } @@ -140,7 +150,7 @@ static inline unsigned long arch_local_save_flags(void) static inline void arch_local_irq_restore(unsigned long flags) { asm volatile( - " msr cpsr_c, %0 @ local_irq_restore" + " msr " IRQMASK_REG_NAME_W ", %0 @ local_irq_restore" : : "r" (flags) : "memory", "cc"); @@ -148,8 +158,8 @@ static inline void arch_local_irq_restore(unsigned long flags) static inline int arch_irqs_disabled_flags(unsigned long flags) { - return flags & PSR_I_BIT; + return flags & IRQMASK_I_BIT; } -#endif -#endif +#endif /* ifdef __KERNEL__ */ +#endif /* ifndef __ASM_ARM_IRQFLAGS_H */ diff --git a/arch/arm/include/asm/mach/arch.h b/arch/arm/include/asm/mach/arch.h index 308ad7d6f98b..75bf07910b81 100644 --- a/arch/arm/include/asm/mach/arch.h +++ b/arch/arm/include/asm/mach/arch.h @@ -8,6 +8,8 @@ * published by the Free Software Foundation. */ +#include <linux/types.h> + #ifndef __ASSEMBLY__ struct tag; @@ -16,8 +18,10 @@ struct pt_regs; struct smp_operations; #ifdef CONFIG_SMP #define smp_ops(ops) (&(ops)) +#define smp_init_ops(ops) (&(ops)) #else #define smp_ops(ops) (struct smp_operations *)NULL +#define smp_init_ops(ops) (bool (*)(void))NULL #endif struct machine_desc { @@ -41,6 +45,7 @@ struct machine_desc { unsigned char reserve_lp2 :1; /* never has lp2 */ char restart_mode; /* default restart mode */ struct smp_operations *smp; /* SMP operations */ + bool (*smp_init)(void); void (*fixup)(struct tag *, char **, struct meminfo *); void (*reserve)(void);/* reserve mem blocks */ diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h index 57870ab313c5..584786f740f9 100644 --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -18,6 +18,8 @@ #include <linux/types.h> #include <linux/sizes.h> +#include <asm/cache.h> + #ifdef CONFIG_NEED_MACH_MEMORY_H #include <mach/memory.h> #endif @@ -141,6 +143,20 @@ #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) +/* + * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed + * around in head.S and proc-*.S are shifted by this amount, in order to + * leave spare high bits for systems with physical address extension. This + * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but + * gives us about 38-bits or so. + */ +#ifdef CONFIG_ARM_LPAE +#define ARCH_PGD_SHIFT L1_CACHE_SHIFT +#else +#define ARCH_PGD_SHIFT 0 +#endif +#define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1) + #ifndef __ASSEMBLY__ /* @@ -207,7 +223,7 @@ static inline unsigned long __phys_to_virt(unsigned long x) * direct-mapped view. We assume this is the first page * of RAM in the mem_map as well. */ -#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) +#define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) /* * These are *only* valid on the kernel direct mapped RAM memory. diff --git a/arch/arm/include/asm/mpu.h b/arch/arm/include/asm/mpu.h new file mode 100644 index 000000000000..c3247cc2fe08 --- /dev/null +++ b/arch/arm/include/asm/mpu.h @@ -0,0 +1,76 @@ +#ifndef __ARM_MPU_H +#define __ARM_MPU_H + +#ifdef CONFIG_ARM_MPU + +/* MPUIR layout */ +#define MPUIR_nU 1 +#define MPUIR_DREGION 8 +#define MPUIR_IREGION 16 +#define MPUIR_DREGION_SZMASK (0xFF << MPUIR_DREGION) +#define MPUIR_IREGION_SZMASK (0xFF << MPUIR_IREGION) + +/* ID_MMFR0 data relevant to MPU */ +#define MMFR0_PMSA (0xF << 4) +#define MMFR0_PMSAv7 (3 << 4) + +/* MPU D/I Size Register fields */ +#define MPU_RSR_SZ 1 +#define MPU_RSR_EN 0 + +/* The D/I RSR value for an enabled region spanning the whole of memory */ +#define MPU_RSR_ALL_MEM 63 + +/* Individual bits in the DR/IR ACR */ +#define MPU_ACR_XN (1 << 12) +#define MPU_ACR_SHARED (1 << 2) + +/* C, B and TEX[2:0] bits only have semantic meanings when grouped */ +#define MPU_RGN_CACHEABLE 0xB +#define MPU_RGN_SHARED_CACHEABLE (MPU_RGN_CACHEABLE | MPU_ACR_SHARED) +#define MPU_RGN_STRONGLY_ORDERED 0 + +/* Main region should only be shared for SMP */ +#ifdef CONFIG_SMP +#define MPU_RGN_NORMAL (MPU_RGN_CACHEABLE | MPU_ACR_SHARED) +#else +#define MPU_RGN_NORMAL MPU_RGN_CACHEABLE +#endif + +/* Access permission bits of ACR (only define those that we use)*/ +#define MPU_AP_PL1RW_PL0RW (0x3 << 8) +#define MPU_AP_PL1RW_PL0R0 (0x2 << 8) +#define MPU_AP_PL1RW_PL0NA (0x1 << 8) + +/* For minimal static MPU region configurations */ +#define MPU_PROBE_REGION 0 +#define MPU_BG_REGION 1 +#define MPU_RAM_REGION 2 +#define MPU_VECTORS_REGION 3 + +/* Maximum number of regions Linux is interested in */ +#define MPU_MAX_REGIONS 16 + +#define MPU_DATA_SIDE 0 +#define MPU_INSTR_SIDE 1 + +#ifndef __ASSEMBLY__ + +struct mpu_rgn { + /* Assume same attributes for d/i-side */ + u32 drbar; + u32 drsr; + u32 dracr; +}; + +struct mpu_rgn_info { + u32 mpuir; + struct mpu_rgn rgns[MPU_MAX_REGIONS]; +}; +extern struct mpu_rgn_info mpu_rgn_info; + +#endif /* __ASSEMBLY__ */ + +#endif /* CONFIG_ARM_MPU */ + +#endif diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h index 812a4944e783..6363f3d1d505 100644 --- a/arch/arm/include/asm/page.h +++ b/arch/arm/include/asm/page.h @@ -13,7 +13,7 @@ /* PAGE_SHIFT determines the page size */ #define PAGE_SHIFT 12 #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) -#define PAGE_MASK (~(PAGE_SIZE-1)) +#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) #ifndef __ASSEMBLY__ diff --git a/arch/arm/include/asm/pgtable-3level-hwdef.h b/arch/arm/include/asm/pgtable-3level-hwdef.h index 18f5cef82ad5..626989fec4d3 100644 --- a/arch/arm/include/asm/pgtable-3level-hwdef.h +++ b/arch/arm/include/asm/pgtable-3level-hwdef.h @@ -30,6 +30,7 @@ #define PMD_TYPE_FAULT (_AT(pmdval_t, 0) << 0) #define PMD_TYPE_TABLE (_AT(pmdval_t, 3) << 0) #define PMD_TYPE_SECT (_AT(pmdval_t, 1) << 0) +#define PMD_TABLE_BIT (_AT(pmdval_t, 1) << 1) #define PMD_BIT4 (_AT(pmdval_t, 0)) #define PMD_DOMAIN(x) (_AT(pmdval_t, 0)) #define PMD_APTABLE_SHIFT (61) @@ -41,6 +42,8 @@ */ #define PMD_SECT_BUFFERABLE (_AT(pmdval_t, 1) << 2) #define PMD_SECT_CACHEABLE (_AT(pmdval_t, 1) << 3) +#define PMD_SECT_USER (_AT(pmdval_t, 1) << 6) /* AP[1] */ +#define PMD_SECT_RDONLY (_AT(pmdval_t, 1) << 7) /* AP[2] */ #define PMD_SECT_S (_AT(pmdval_t, 3) << 8) #define PMD_SECT_AF (_AT(pmdval_t, 1) << 10) #define PMD_SECT_nG (_AT(pmdval_t, 1) << 11) @@ -66,6 +69,7 @@ #define PTE_TYPE_MASK (_AT(pteval_t, 3) << 0) #define PTE_TYPE_FAULT (_AT(pteval_t, 0) << 0) #define PTE_TYPE_PAGE (_AT(pteval_t, 3) << 0) +#define PTE_TABLE_BIT (_AT(pteval_t, 1) << 1) #define PTE_BUFFERABLE (_AT(pteval_t, 1) << 2) /* AttrIndx[0] */ #define PTE_CACHEABLE (_AT(pteval_t, 1) << 3) /* AttrIndx[1] */ #define PTE_EXT_SHARED (_AT(pteval_t, 3) << 8) /* SH[1:0], inner shareable */ @@ -79,4 +83,24 @@ #define PHYS_MASK_SHIFT (40) #define PHYS_MASK ((1ULL << PHYS_MASK_SHIFT) - 1) +/* + * TTBR0/TTBR1 split (PAGE_OFFSET): + * 0x40000000: T0SZ = 2, T1SZ = 0 (not used) + * 0x80000000: T0SZ = 0, T1SZ = 1 + * 0xc0000000: T0SZ = 0, T1SZ = 2 + * + * Only use this feature if PHYS_OFFSET <= PAGE_OFFSET, otherwise + * booting secondary CPUs would end up using TTBR1 for the identity + * mapping set up in TTBR0. + */ +#if defined CONFIG_VMSPLIT_2G +#define TTBR1_OFFSET 16 /* skip two L1 entries */ +#elif defined CONFIG_VMSPLIT_3G +#define TTBR1_OFFSET (4096 * (1 + 3)) /* only L2, skip pgd + 3*pmd */ +#else +#define TTBR1_OFFSET 0 +#endif + +#define TTBR1_SIZE (((PAGE_OFFSET >> 30) - 1) << 16) + #endif diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h index 86b8fe398b95..5689c18c85f5 100644 --- a/arch/arm/include/asm/pgtable-3level.h +++ b/arch/arm/include/asm/pgtable-3level.h @@ -33,7 +33,7 @@ #define PTRS_PER_PMD 512 #define PTRS_PER_PGD 4 -#define PTE_HWTABLE_PTRS (PTRS_PER_PTE) +#define PTE_HWTABLE_PTRS (0) #define PTE_HWTABLE_OFF (0) #define PTE_HWTABLE_SIZE (PTRS_PER_PTE * sizeof(u64)) @@ -48,20 +48,28 @@ #define PMD_SHIFT 21 #define PMD_SIZE (1UL << PMD_SHIFT) -#define PMD_MASK (~(PMD_SIZE-1)) +#define PMD_MASK (~((1 << PMD_SHIFT) - 1)) #define PGDIR_SIZE (1UL << PGDIR_SHIFT) -#define PGDIR_MASK (~(PGDIR_SIZE-1)) +#define PGDIR_MASK (~((1 << PGDIR_SHIFT) - 1)) /* * section address mask and size definitions. */ #define SECTION_SHIFT 21 #define SECTION_SIZE (1UL << SECTION_SHIFT) -#define SECTION_MASK (~(SECTION_SIZE-1)) +#define SECTION_MASK (~((1 << SECTION_SHIFT) - 1)) #define USER_PTRS_PER_PGD (PAGE_OFFSET / PGDIR_SIZE) /* + * Hugetlb definitions. + */ +#define HPAGE_SHIFT PMD_SHIFT +#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) +#define HPAGE_MASK (~(HPAGE_SIZE - 1)) +#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) + +/* * "Linux" PTE definitions for LPAE. * * These bits overlap with the hardware bits but the naming is preserved for @@ -79,6 +87,11 @@ #define L_PTE_SPECIAL (_AT(pteval_t, 1) << 56) /* unused */ #define L_PTE_NONE (_AT(pteval_t, 1) << 57) /* PROT_NONE */ +#define PMD_SECT_VALID (_AT(pmdval_t, 1) << 0) +#define PMD_SECT_DIRTY (_AT(pmdval_t, 1) << 55) +#define PMD_SECT_SPLITTING (_AT(pmdval_t, 1) << 56) +#define PMD_SECT_NONE (_AT(pmdval_t, 1) << 57) + /* * To be used in assembly code with the upper page attributes. */ @@ -166,8 +179,83 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) clean_pmd_entry(pmdp); \ } while (0) +/* + * For 3 levels of paging the PTE_EXT_NG bit will be set for user address ptes + * that are written to a page table but not for ptes created with mk_pte. + * + * In hugetlb_no_page, a new huge pte (new_pte) is generated and passed to + * hugetlb_cow, where it is compared with an entry in a page table. + * This comparison test fails erroneously leading ultimately to a memory leak. + * + * To correct this behaviour, we mask off PTE_EXT_NG for any pte that is + * present before running the comparison. + */ +#define __HAVE_ARCH_PTE_SAME +#define pte_same(pte_a,pte_b) ((pte_present(pte_a) ? pte_val(pte_a) & ~PTE_EXT_NG \ + : pte_val(pte_a)) \ + == (pte_present(pte_b) ? pte_val(pte_b) & ~PTE_EXT_NG \ + : pte_val(pte_b))) + #define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,__pte(pte_val(pte)|(ext))) +#define pte_huge(pte) (pte_val(pte) && !(pte_val(pte) & PTE_TABLE_BIT)) +#define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT)) + +#define pmd_young(pmd) (pmd_val(pmd) & PMD_SECT_AF) + +#define __HAVE_ARCH_PMD_WRITE +#define pmd_write(pmd) (!(pmd_val(pmd) & PMD_SECT_RDONLY)) + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +#define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT)) +#define pmd_trans_splitting(pmd) (pmd_val(pmd) & PMD_SECT_SPLITTING) +#endif + +#define PMD_BIT_FUNC(fn,op) \ +static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; } + +PMD_BIT_FUNC(wrprotect, |= PMD_SECT_RDONLY); +PMD_BIT_FUNC(mkold, &= ~PMD_SECT_AF); +PMD_BIT_FUNC(mksplitting, |= PMD_SECT_SPLITTING); +PMD_BIT_FUNC(mkwrite, &= ~PMD_SECT_RDONLY); +PMD_BIT_FUNC(mkdirty, |= PMD_SECT_DIRTY); +PMD_BIT_FUNC(mkyoung, |= PMD_SECT_AF); + +#define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT)) + +#define pmd_pfn(pmd) (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT) +#define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) +#define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) + +/* represent a notpresent pmd by zero, this is used by pmdp_invalidate */ +#define pmd_mknotpresent(pmd) (__pmd(0)) + +static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) +{ + const pmdval_t mask = PMD_SECT_USER | PMD_SECT_XN | PMD_SECT_RDONLY | + PMD_SECT_VALID | PMD_SECT_NONE; + pmd_val(pmd) = (pmd_val(pmd) & ~mask) | (pgprot_val(newprot) & mask); + return pmd; +} + +static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, + pmd_t *pmdp, pmd_t pmd) +{ + BUG_ON(addr >= TASK_SIZE); + + /* create a faulting entry if PROT_NONE protected */ + if (pmd_val(pmd) & PMD_SECT_NONE) + pmd_val(pmd) &= ~PMD_SECT_VALID; + + *pmdp = __pmd(pmd_val(pmd) | PMD_SECT_nG); + flush_pmd_entry(pmdp); +} + +static inline int has_transparent_hugepage(void) +{ + return 1; +} + #endif /* __ASSEMBLY__ */ #endif /* _ASM_PGTABLE_3LEVEL_H */ diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 9bcd262a9008..eaedce7b7e3a 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -24,6 +24,9 @@ #include <asm/memory.h> #include <asm/pgtable-hwdef.h> + +#include <asm/tlbflush.h> + #ifdef CONFIG_ARM_LPAE #include <asm/pgtable-3level.h> #else diff --git a/arch/arm/include/asm/proc-fns.h b/arch/arm/include/asm/proc-fns.h index f3628fb3d2b3..5324c1112f3a 100644 --- a/arch/arm/include/asm/proc-fns.h +++ b/arch/arm/include/asm/proc-fns.h @@ -60,7 +60,7 @@ extern struct processor { /* * Set the page table */ - void (*switch_mm)(unsigned long pgd_phys, struct mm_struct *mm); + void (*switch_mm)(phys_addr_t pgd_phys, struct mm_struct *mm); /* * Set a possibly extended PTE. Non-extended PTEs should * ignore 'ext'. @@ -82,7 +82,7 @@ extern void cpu_proc_init(void); extern void cpu_proc_fin(void); extern int cpu_do_idle(void); extern void cpu_dcache_clean_area(void *, int); -extern void cpu_do_switch_mm(unsigned long pgd_phys, struct mm_struct *mm); +extern void cpu_do_switch_mm(phys_addr_t pgd_phys, struct mm_struct *mm); #ifdef CONFIG_ARM_LPAE extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte); #else @@ -116,13 +116,25 @@ extern void cpu_resume(void); #define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm) #ifdef CONFIG_ARM_LPAE + +#define cpu_get_ttbr(nr) \ + ({ \ + u64 ttbr; \ + __asm__("mrrc p15, " #nr ", %Q0, %R0, c2" \ + : "=r" (ttbr)); \ + ttbr; \ + }) + +#define cpu_set_ttbr(nr, val) \ + do { \ + u64 ttbr = val; \ + __asm__("mcrr p15, " #nr ", %Q0, %R0, c2" \ + : : "r" (ttbr)); \ + } while (0) + #define cpu_get_pgd() \ ({ \ - unsigned long pg, pg2; \ - __asm__("mrrc p15, 0, %0, %1, c2" \ - : "=r" (pg), "=r" (pg2) \ - : \ - : "cc"); \ + u64 pg = cpu_get_ttbr(0); \ pg &= ~(PTRS_PER_PGD*sizeof(pgd_t)-1); \ (pgd_t *)phys_to_virt(pg); \ }) @@ -137,6 +149,10 @@ extern void cpu_resume(void); }) #endif +#else /*!CONFIG_MMU */ + +#define cpu_switch_mm(pgd,mm) { } + #endif #endif /* __ASSEMBLY__ */ diff --git a/arch/arm/include/asm/psci.h b/arch/arm/include/asm/psci.h index ce0dbe7c1625..c4ae171850f8 100644 --- a/arch/arm/include/asm/psci.h +++ b/arch/arm/include/asm/psci.h @@ -32,5 +32,14 @@ struct psci_operations { }; extern struct psci_operations psci_ops; +extern struct smp_operations psci_smp_ops; + +#ifdef CONFIG_ARM_PSCI +void psci_init(void); +bool psci_smp_available(void); +#else +static inline void psci_init(void) { } +static inline bool psci_smp_available(void) { return false; } +#endif #endif /* __ASM_ARM_PSCI_H */ diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h index 3d52ee1bfb31..04c99f36ff7f 100644 --- a/arch/arm/include/asm/ptrace.h +++ b/arch/arm/include/asm/ptrace.h @@ -45,6 +45,7 @@ struct pt_regs { */ static inline int valid_user_regs(struct pt_regs *regs) { +#ifndef CONFIG_CPU_V7M unsigned long mode = regs->ARM_cpsr & MODE_MASK; /* @@ -67,6 +68,9 @@ static inline int valid_user_regs(struct pt_regs *regs) regs->ARM_cpsr |= USR_MODE; return 0; +#else /* ifndef CONFIG_CPU_V7M */ + return 1; +#endif } static inline long regs_return_value(struct pt_regs *regs) diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h index d3a22bebe6ce..a8cae71caceb 100644 --- a/arch/arm/include/asm/smp.h +++ b/arch/arm/include/asm/smp.h @@ -65,7 +65,10 @@ asmlinkage void secondary_start_kernel(void); * Initial data for bringing up a secondary CPU. */ struct secondary_data { - unsigned long pgdir; + union { + unsigned long mpu_rgn_szr; + unsigned long pgdir; + }; unsigned long swapper_pg_dir; void *stack; }; diff --git a/arch/arm/include/asm/smp_plat.h b/arch/arm/include/asm/smp_plat.h index aaa61b6f50ff..1c7b6f8101ae 100644 --- a/arch/arm/include/asm/smp_plat.h +++ b/arch/arm/include/asm/smp_plat.h @@ -26,6 +26,9 @@ static inline bool is_smp(void) } /* all SMP configurations have the extended CPUID registers */ +#ifndef CONFIG_MMU +#define tlb_ops_need_broadcast() 0 +#else static inline int tlb_ops_need_broadcast(void) { if (!is_smp()) @@ -33,6 +36,7 @@ static inline int tlb_ops_need_broadcast(void) return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 2; } +#endif #if !defined(CONFIG_SMP) || __LINUX_ARM_ARCH__ >= 7 #define cache_ops_need_broadcast() 0 diff --git a/arch/arm/include/asm/system_info.h b/arch/arm/include/asm/system_info.h index dfd386d0c022..720ea0320a6d 100644 --- a/arch/arm/include/asm/system_info.h +++ b/arch/arm/include/asm/system_info.h @@ -11,6 +11,7 @@ #define CPU_ARCH_ARMv5TEJ 7 #define CPU_ARCH_ARMv6 8 #define CPU_ARCH_ARMv7 9 +#define CPU_ARCH_ARMv7M 10 #ifndef __ASSEMBLY__ diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h index 99a19512ee26..bdc62da2f212 100644 --- a/arch/arm/include/asm/tlb.h +++ b/arch/arm/include/asm/tlb.h @@ -223,6 +223,12 @@ static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, #endif } +static inline void +tlb_remove_pmd_tlb_entry(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr) +{ + tlb_add_flush(tlb, addr); +} + #define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr) #define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr) #define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp) diff --git a/arch/arm/include/asm/tlbflush.h b/arch/arm/include/asm/tlbflush.h index a3625d141c1d..fdbb9e369745 100644 --- a/arch/arm/include/asm/tlbflush.h +++ b/arch/arm/include/asm/tlbflush.h @@ -535,8 +535,33 @@ static inline void update_mmu_cache(struct vm_area_struct *vma, } #endif +#define update_mmu_cache_pmd(vma, address, pmd) do { } while (0) + #endif -#endif /* CONFIG_MMU */ +#elif defined(CONFIG_SMP) /* !CONFIG_MMU */ + +#ifndef __ASSEMBLY__ + +#include <linux/mm_types.h> + +static inline void local_flush_tlb_all(void) { } +static inline void local_flush_tlb_mm(struct mm_struct *mm) { } +static inline void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) { } +static inline void local_flush_tlb_kernel_page(unsigned long kaddr) { } +static inline void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { } +static inline void local_flush_tlb_kernel_range(unsigned long start, unsigned long end) { } +static inline void local_flush_bp_all(void) { } + +extern void flush_tlb_all(void); +extern void flush_tlb_mm(struct mm_struct *mm); +extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr); +extern void flush_tlb_kernel_page(unsigned long kaddr); +extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); +extern void flush_tlb_kernel_range(unsigned long start, unsigned long end); +extern void flush_bp_all(void); +#endif /* __ASSEMBLY__ */ + +#endif #endif diff --git a/arch/arm/include/asm/v7m.h b/arch/arm/include/asm/v7m.h new file mode 100644 index 000000000000..fa88d09fa3d9 --- /dev/null +++ b/arch/arm/include/asm/v7m.h @@ -0,0 +1,44 @@ +/* + * Common defines for v7m cpus + */ +#define V7M_SCS_ICTR IOMEM(0xe000e004) +#define V7M_SCS_ICTR_INTLINESNUM_MASK 0x0000000f + +#define BASEADDR_V7M_SCB IOMEM(0xe000ed00) + +#define V7M_SCB_CPUID 0x00 + +#define V7M_SCB_ICSR 0x04 +#define V7M_SCB_ICSR_PENDSVSET (1 << 28) +#define V7M_SCB_ICSR_PENDSVCLR (1 << 27) +#define V7M_SCB_ICSR_RETTOBASE (1 << 11) + +#define V7M_SCB_VTOR 0x08 + +#define V7M_SCB_SCR 0x10 +#define V7M_SCB_SCR_SLEEPDEEP (1 << 2) + +#define V7M_SCB_CCR 0x14 +#define V7M_SCB_CCR_STKALIGN (1 << 9) + +#define V7M_SCB_SHPR2 0x1c +#define V7M_SCB_SHPR3 0x20 + +#define V7M_SCB_SHCSR 0x24 +#define V7M_SCB_SHCSR_USGFAULTENA (1 << 18) +#define V7M_SCB_SHCSR_BUSFAULTENA (1 << 17) +#define V7M_SCB_SHCSR_MEMFAULTENA (1 << 16) + +#define V7M_xPSR_FRAMEPTRALIGN 0x00000200 +#define V7M_xPSR_EXCEPTIONNO 0x000001ff + +/* + * When branching to an address that has bits [31:28] == 0xf an exception return + * occurs. Bits [27:5] are reserved (SBOP). If the processor implements the FP + * extension Bit [4] defines if the exception frame has space allocated for FP + * state information, SBOP otherwise. Bit [3] defines the mode that is returned + * to (0 -> handler mode; 1 -> thread mode). Bit [2] defines which sp is used + * (0 -> msp; 1 -> psp). Bits [1:0] are fixed to 0b01. + */ +#define EXC_RET_STACK_MASK 0x00000004 +#define EXC_RET_THREADMODE_PROCESSSTACK 0xfffffffd diff --git a/arch/arm/include/debug/vexpress.S b/arch/arm/include/debug/vexpress.S index dc8e882a6257..acafb229e2b6 100644 --- a/arch/arm/include/debug/vexpress.S +++ b/arch/arm/include/debug/vexpress.S @@ -16,6 +16,8 @@ #define DEBUG_LL_PHYS_BASE_RS1 0x1c000000 #define DEBUG_LL_UART_OFFSET_RS1 0x00090000 +#define DEBUG_LL_UART_PHYS_CRX 0xb0090000 + #define DEBUG_LL_VIRT_BASE 0xf8000000 #if defined(CONFIG_DEBUG_VEXPRESS_UART0_DETECT) @@ -67,6 +69,14 @@ #include <asm/hardware/debug-pl01x.S> +#elif defined(CONFIG_DEBUG_VEXPRESS_UART0_CRX) + + .macro addruart,rp,tmp,tmp2 + ldr \rp, =DEBUG_LL_UART_PHYS_CRX + .endm + +#include <asm/hardware/debug-pl01x.S> + #else /* CONFIG_DEBUG_LL_UART_NONE */ .macro addruart, rp, rv, tmp diff --git a/arch/arm/include/uapi/asm/hwcap.h b/arch/arm/include/uapi/asm/hwcap.h index 3688fd15a32d..6d34d080372a 100644 --- a/arch/arm/include/uapi/asm/hwcap.h +++ b/arch/arm/include/uapi/asm/hwcap.h @@ -25,6 +25,6 @@ #define HWCAP_IDIVT (1 << 18) #define HWCAP_VFPD32 (1 << 19) /* set if VFP has 32 regs (not 16) */ #define HWCAP_IDIV (HWCAP_IDIVA | HWCAP_IDIVT) - +#define HWCAP_LPAE (1 << 20) #endif /* _UAPI__ASMARM_HWCAP_H */ diff --git a/arch/arm/include/uapi/asm/ptrace.h b/arch/arm/include/uapi/asm/ptrace.h index 96ee0929790f..5af0ed1b825a 100644 --- a/arch/arm/include/uapi/asm/ptrace.h +++ b/arch/arm/include/uapi/asm/ptrace.h @@ -34,28 +34,47 @@ /* * PSR bits + * Note on V7M there is no mode contained in the PSR */ #define USR26_MODE 0x00000000 #define FIQ26_MODE 0x00000001 #define IRQ26_MODE 0x00000002 #define SVC26_MODE 0x00000003 +#if defined(__KERNEL__) && defined(CONFIG_CPU_V7M) +/* + * Use 0 here to get code right that creates a userspace + * or kernel space thread. + */ +#define USR_MODE 0x00000000 +#define SVC_MODE 0x00000000 +#else #define USR_MODE 0x00000010 +#define SVC_MODE 0x00000013 +#endif #define FIQ_MODE 0x00000011 #define IRQ_MODE 0x00000012 -#define SVC_MODE 0x00000013 #define ABT_MODE 0x00000017 #define HYP_MODE 0x0000001a #define UND_MODE 0x0000001b #define SYSTEM_MODE 0x0000001f #define MODE32_BIT 0x00000010 #define MODE_MASK 0x0000001f -#define PSR_T_BIT 0x00000020 -#define PSR_F_BIT 0x00000040 -#define PSR_I_BIT 0x00000080 -#define PSR_A_BIT 0x00000100 -#define PSR_E_BIT 0x00000200 -#define PSR_J_BIT 0x01000000 -#define PSR_Q_BIT 0x08000000 + +#define V4_PSR_T_BIT 0x00000020 /* >= V4T, but not V7M */ +#define V7M_PSR_T_BIT 0x01000000 +#if defined(__KERNEL__) && defined(CONFIG_CPU_V7M) +#define PSR_T_BIT V7M_PSR_T_BIT +#else +/* for compatibility */ +#define PSR_T_BIT V4_PSR_T_BIT +#endif + +#define PSR_F_BIT 0x00000040 /* >= V4, but not V7M */ +#define PSR_I_BIT 0x00000080 /* >= V4, but not V7M */ +#define PSR_A_BIT 0x00000100 /* >= V6, but not V7M */ +#define PSR_E_BIT 0x00000200 /* >= V6, but not V7M */ +#define PSR_J_BIT 0x01000000 /* >= V5J, but not V7M */ +#define PSR_Q_BIT 0x08000000 /* >= V5E, including V7M */ #define PSR_V_BIT 0x10000000 #define PSR_C_BIT 0x20000000 #define PSR_Z_BIT 0x40000000 diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 5f3338eacad2..fccfbdb03df1 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -15,7 +15,7 @@ CFLAGS_REMOVE_return_address.o = -pg # Object file lists. -obj-y := elf.o entry-armv.o entry-common.o irq.o opcodes.o \ +obj-y := elf.o entry-common.o irq.o opcodes.o \ process.o ptrace.o return_address.o sched_clock.o \ setup.o signal.o stacktrace.o sys_arm.o time.o traps.o @@ -23,6 +23,12 @@ obj-$(CONFIG_ATAGS) += atags_parse.o obj-$(CONFIG_ATAGS_PROC) += atags_proc.o obj-$(CONFIG_DEPRECATED_PARAM_STRUCT) += atags_compat.o +ifeq ($(CONFIG_CPU_V7M),y) +obj-y += entry-v7m.o +else +obj-y += entry-armv.o +endif + obj-$(CONFIG_OC_ETM) += etm.o obj-$(CONFIG_CPU_IDLE) += cpuidle.o obj-$(CONFIG_ISA_DMA_API) += dma.o @@ -32,7 +38,10 @@ obj-$(CONFIG_ARTHUR) += arthur.o obj-$(CONFIG_ISA_DMA) += dma-isa.o obj-$(CONFIG_PCI) += bios32.o isa.o obj-$(CONFIG_ARM_CPU_SUSPEND) += sleep.o suspend.o -obj-$(CONFIG_SMP) += smp.o smp_tlb.o +obj-$(CONFIG_SMP) += smp.o +ifdef CONFIG_MMU +obj-$(CONFIG_SMP) += smp_tlb.o +endif obj-$(CONFIG_HAVE_ARM_SCU) += smp_scu.o obj-$(CONFIG_HAVE_ARM_TWD) += smp_twd.o obj-$(CONFIG_ARM_ARCH_TIMER) += arch_timer.o @@ -82,6 +91,9 @@ obj-$(CONFIG_DEBUG_LL) += debug.o obj-$(CONFIG_EARLY_PRINTK) += early_printk.o obj-$(CONFIG_ARM_VIRT_EXT) += hyp-stub.o -obj-$(CONFIG_ARM_PSCI) += psci.o +ifeq ($(CONFIG_ARM_PSCI),y) +obj-y += psci.o +obj-$(CONFIG_SMP) += psci_smp.o +endif extra-y := $(head-y) vmlinux.lds diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index bc5bc0a97131..85a72b0809ca 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -350,6 +350,9 @@ ENDPROC(ftrace_stub) .align 5 ENTRY(vector_swi) +#ifdef CONFIG_CPU_V7M + v7m_exception_entry +#else sub sp, sp, #S_FRAME_SIZE stmia sp, {r0 - r12} @ Calling r0 - r12 ARM( add r8, sp, #S_PC ) @@ -360,6 +363,7 @@ ENTRY(vector_swi) str lr, [sp, #S_PC] @ Save calling PC str r8, [sp, #S_PSR] @ Save CPSR str r0, [sp, #S_OLD_R0] @ Save OLD_R0 +#endif zero_fp /* diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S index 160f3376ba6d..de23a9beed13 100644 --- a/arch/arm/kernel/entry-header.S +++ b/arch/arm/kernel/entry-header.S @@ -5,6 +5,7 @@ #include <asm/asm-offsets.h> #include <asm/errno.h> #include <asm/thread_info.h> +#include <asm/v7m.h> @ Bad Abort numbers @ ----------------- @@ -44,6 +45,116 @@ #endif .endm +#ifdef CONFIG_CPU_V7M +/* + * ARMv7-M exception entry/exit macros. + * + * xPSR, ReturnAddress(), LR (R14), R12, R3, R2, R1, and R0 are + * automatically saved on the current stack (32 words) before + * switching to the exception stack (SP_main). + * + * If exception is taken while in user mode, SP_main is + * empty. Otherwise, SP_main is aligned to 64 bit automatically + * (CCR.STKALIGN set). + * + * Linux assumes that the interrupts are disabled when entering an + * exception handler and it may BUG if this is not the case. Interrupts + * are disabled during entry and reenabled in the exit macro. + * + * v7m_exception_slow_exit is used when returning from SVC or PendSV. + * When returning to kernel mode, we don't return from exception. + */ + .macro v7m_exception_entry + @ determine the location of the registers saved by the core during + @ exception entry. Depending on the mode the cpu was in when the + @ exception happend that is either on the main or the process stack. + @ Bit 2 of EXC_RETURN stored in the lr register specifies which stack + @ was used. + tst lr, #EXC_RET_STACK_MASK + mrsne r12, psp + moveq r12, sp + + @ we cannot rely on r0-r3 and r12 matching the value saved in the + @ exception frame because of tail-chaining. So these have to be + @ reloaded. + ldmia r12!, {r0-r3} + + @ Linux expects to have irqs off. Do it here before taking stack space + cpsid i + + sub sp, #S_FRAME_SIZE-S_IP + stmdb sp!, {r0-r11} + + @ load saved r12, lr, return address and xPSR. + @ r0-r7 are used for signals and never touched from now on. Clobbering + @ r8-r12 is OK. + mov r9, r12 + ldmia r9!, {r8, r10-r12} + + @ calculate the original stack pointer value. + @ r9 currently points to the memory location just above the auto saved + @ xPSR. + @ The cpu might automatically 8-byte align the stack. Bit 9 + @ of the saved xPSR specifies if stack aligning took place. In this case + @ another 32-bit value is included in the stack. + + tst r12, V7M_xPSR_FRAMEPTRALIGN + addne r9, r9, #4 + + @ store saved r12 using str to have a register to hold the base for stm + str r8, [sp, #S_IP] + add r8, sp, #S_SP + @ store r13-r15, xPSR + stmia r8!, {r9-r12} + @ store old_r0 + str r0, [r8] + .endm + + /* + * PENDSV and SVCALL are configured to have the same exception + * priorities. As a kernel thread runs at SVCALL execution priority it + * can never be preempted and so we will never have to return to a + * kernel thread here. + */ + .macro v7m_exception_slow_exit ret_r0 + cpsid i + ldr lr, =EXC_RET_THREADMODE_PROCESSSTACK + + @ read original r12, sp, lr, pc and xPSR + add r12, sp, #S_IP + ldmia r12, {r1-r5} + + @ an exception frame is always 8-byte aligned. To tell the hardware if + @ the sp to be restored is aligned or not set bit 9 of the saved xPSR + @ accordingly. + tst r2, #4 + subne r2, r2, #4 + orrne r5, V7M_xPSR_FRAMEPTRALIGN + biceq r5, V7M_xPSR_FRAMEPTRALIGN + + @ write basic exception frame + stmdb r2!, {r1, r3-r5} + ldmia sp, {r1, r3-r5} + .if \ret_r0 + stmdb r2!, {r0, r3-r5} + .else + stmdb r2!, {r1, r3-r5} + .endif + + @ restore process sp + msr psp, r2 + + @ restore original r4-r11 + ldmia sp!, {r0-r11} + + @ restore main sp + add sp, sp, #S_FRAME_SIZE-S_IP + + cpsie i + bx lr + .endm +#endif /* CONFIG_CPU_V7M */ + @ @ Store/load the USER SP and LR registers by switching to the SYS @ mode. Useful in Thumb-2 mode where "stm/ldm rd, {sp, lr}^" is not @@ -165,6 +276,18 @@ rfeia sp! .endm +#ifdef CONFIG_CPU_V7M + /* + * Note we don't need to do clrex here as clearing the local monitor is + * part of each exception entry and exit sequence. + */ + .macro restore_user_regs, fast = 0, offset = 0 + .if \offset + add sp, #\offset + .endif + v7m_exception_slow_exit ret_r0 = \fast + .endm +#else /* ifdef CONFIG_CPU_V7M */ .macro restore_user_regs, fast = 0, offset = 0 clrex @ clear the exclusive monitor mov r2, sp @@ -181,6 +304,7 @@ add sp, sp, #S_FRAME_SIZE - S_SP movs pc, lr @ return & move spsr_svc into cpsr .endm +#endif /* ifdef CONFIG_CPU_V7M / else */ .macro get_thread_info, rd mov \rd, sp diff --git a/arch/arm/kernel/entry-v7m.S b/arch/arm/kernel/entry-v7m.S new file mode 100644 index 000000000000..e00621f1403f --- /dev/null +++ b/arch/arm/kernel/entry-v7m.S @@ -0,0 +1,143 @@ +/* + * linux/arch/arm/kernel/entry-v7m.S + * + * Copyright (C) 2008 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Low-level vector interface routines for the ARMv7-M architecture + */ +#include <asm/memory.h> +#include <asm/glue.h> +#include <asm/thread_notify.h> +#include <asm/v7m.h> + +#include <mach/entry-macro.S> + +#include "entry-header.S" + +#ifdef CONFIG_TRACE_IRQFLAGS +#error "CONFIG_TRACE_IRQFLAGS not supported on the current ARMv7M implementation" +#endif + +__invalid_entry: + v7m_exception_entry + adr r0, strerr + mrs r1, ipsr + mov r2, lr + bl printk + mov r0, sp + bl show_regs +1: b 1b +ENDPROC(__invalid_entry) + +strerr: .asciz "\nUnhandled exception: IPSR = %08lx LR = %08lx\n" + + .align 2 +__irq_entry: + v7m_exception_entry + + @ + @ Invoke the IRQ handler + @ + mrs r0, ipsr + ldr r1, =V7M_xPSR_EXCEPTIONNO + and r0, r1 + sub r0, #16 + mov r1, sp + stmdb sp!, {lr} + @ routine called with r0 = irq number, r1 = struct pt_regs * + bl nvic_do_IRQ + + pop {lr} + @ + @ Check for any pending work if returning to user + @ + ldr r1, =BASEADDR_V7M_SCB + ldr r0, [r1, V7M_SCB_ICSR] + tst r0, V7M_SCB_ICSR_RETTOBASE + beq 2f + + get_thread_info tsk + ldr r2, [tsk, #TI_FLAGS] + tst r2, #_TIF_WORK_MASK + beq 2f @ no work pending + mov r0, #V7M_SCB_ICSR_PENDSVSET + str r0, [r1, V7M_SCB_ICSR] @ raise PendSV + +2: + @ registers r0-r3 and r12 are automatically restored on exception + @ return. r4-r7 were not clobbered in v7m_exception_entry so for + @ correctness they don't need to be restored. So only r8-r11 must be + @ restored here. The easiest way to do so is to restore r0-r7, too. + ldmia sp!, {r0-r11} + add sp, #S_FRAME_SIZE-S_IP + cpsie i + bx lr +ENDPROC(__irq_entry) + +__pendsv_entry: + v7m_exception_entry + + ldr r1, =BASEADDR_V7M_SCB + mov r0, #V7M_SCB_ICSR_PENDSVCLR + str r0, [r1, V7M_SCB_ICSR] @ clear PendSV + + @ execute the pending work, including reschedule + get_thread_info tsk + mov why, #0 + b ret_to_user +ENDPROC(__pendsv_entry) + +/* + * Register switch for ARMv7-M processors. + * r0 = previous task_struct, r1 = previous thread_info, r2 = next thread_info + * previous and next are guaranteed not to be the same. + */ +ENTRY(__switch_to) + .fnstart + .cantunwind + add ip, r1, #TI_CPU_SAVE + stmia ip!, {r4 - r11} @ Store most regs on stack + str sp, [ip], #4 + str lr, [ip], #4 + mov r5, r0 + add r4, r2, #TI_CPU_SAVE + ldr r0, =thread_notify_head + mov r1, #THREAD_NOTIFY_SWITCH + bl atomic_notifier_call_chain + mov ip, r4 + mov r0, r5 + ldmia ip!, {r4 - r11} @ Load all regs saved previously + ldr sp, [ip] + ldr pc, [ip, #4]! + .fnend +ENDPROC(__switch_to) + + .data + .align 8 +/* + * Vector table (64 words => 256 bytes natural alignment) + */ +ENTRY(vector_table) + .long 0 @ 0 - Reset stack pointer + .long __invalid_entry @ 1 - Reset + .long __invalid_entry @ 2 - NMI + .long __invalid_entry @ 3 - HardFault + .long __invalid_entry @ 4 - MemManage + .long __invalid_entry @ 5 - BusFault + .long __invalid_entry @ 6 - UsageFault + .long __invalid_entry @ 7 - Reserved + .long __invalid_entry @ 8 - Reserved + .long __invalid_entry @ 9 - Reserved + .long __invalid_entry @ 10 - Reserved + .long vector_swi @ 11 - SVCall + .long __invalid_entry @ 12 - Debug Monitor + .long __invalid_entry @ 13 - Reserved + .long __pendsv_entry @ 14 - PendSV + .long __invalid_entry @ 15 - SysTick + .rept 64 - 16 + .long __irq_entry @ 16..64 - External Interrupts + .endr diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S index 6a2e09c952c7..75f14cc3e073 100644 --- a/arch/arm/kernel/head-nommu.S +++ b/arch/arm/kernel/head-nommu.S @@ -17,8 +17,12 @@ #include <asm/assembler.h> #include <asm/ptrace.h> #include <asm/asm-offsets.h> +#include <asm/memory.h> #include <asm/cp15.h> #include <asm/thread_info.h> +#include <asm/v7m.h> +#include <asm/mpu.h> +#include <asm/page.h> /* * Kernel startup entry point. @@ -50,21 +54,86 @@ ENTRY(stext) setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9 @ ensure svc mode @ and irqs disabled -#ifndef CONFIG_CPU_CP15 - ldr r9, =CONFIG_PROCESSOR_ID -#else +#if defined(CONFIG_CPU_CP15) mrc p15, 0, r9, c0, c0 @ get processor id +#elif defined(CONFIG_CPU_V7M) + ldr r9, =BASEADDR_V7M_SCB + ldr r9, [r9, V7M_SCB_CPUID] +#else + ldr r9, =CONFIG_PROCESSOR_ID #endif bl __lookup_processor_type @ r5=procinfo r9=cpuid movs r10, r5 @ invalid processor (r5=0)? beq __error_p @ yes, error 'p' - adr lr, BSYM(__after_proc_init) @ return (PIC) address +#ifdef CONFIG_ARM_MPU + /* Calculate the size of a region covering just the kernel */ + ldr r5, =PHYS_OFFSET @ Region start: PHYS_OFFSET + ldr r6, =(_end) @ Cover whole kernel + sub r6, r6, r5 @ Minimum size of region to map + clz r6, r6 @ Region size must be 2^N... + rsb r6, r6, #31 @ ...so round up region size + lsl r6, r6, #MPU_RSR_SZ @ Put size in right field + orr r6, r6, #(1 << MPU_RSR_EN) @ Set region enabled bit + bl __setup_mpu +#endif + ldr r13, =__mmap_switched @ address to jump to after + @ initialising sctlr + adr lr, BSYM(1f) @ return (PIC) address ARM( add pc, r10, #PROCINFO_INITFUNC ) THUMB( add r12, r10, #PROCINFO_INITFUNC ) THUMB( mov pc, r12 ) + 1: b __after_proc_init ENDPROC(stext) +#ifdef CONFIG_SMP + __CPUINIT +ENTRY(secondary_startup) + /* + * Common entry point for secondary CPUs. + * + * Ensure that we're in SVC mode, and IRQs are disabled. Lookup + * the processor type - there is no need to check the machine type + * as it has already been validated by the primary processor. + */ + setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9 +#ifndef CONFIG_CPU_CP15 + ldr r9, =CONFIG_PROCESSOR_ID +#else + mrc p15, 0, r9, c0, c0 @ get processor id +#endif + bl __lookup_processor_type @ r5=procinfo r9=cpuid + movs r10, r5 @ invalid processor? + beq __error_p @ yes, error 'p' + + adr r4, __secondary_data + ldmia r4, {r7, r12} + +#ifdef CONFIG_ARM_MPU + /* Use MPU region info supplied by __cpu_up */ + ldr r6, [r7] @ get secondary_data.mpu_szr + bl __setup_mpu @ Initialize the MPU +#endif + + adr lr, BSYM(__after_proc_init) @ return address + mov r13, r12 @ __secondary_switched address + ARM( add pc, r10, #PROCINFO_INITFUNC ) + THUMB( add r12, r10, #PROCINFO_INITFUNC ) + THUMB( mov pc, r12 ) +ENDPROC(secondary_startup) + +ENTRY(__secondary_switched) + ldr sp, [r7, #8] @ set up the stack pointer + mov fp, #0 + b secondary_start_kernel +ENDPROC(__secondary_switched) + + .type __secondary_data, %object +__secondary_data: + .long secondary_data + .long __secondary_switched +#endif /* CONFIG_SMP */ + /* * Set the Control Register and Read the process ID. */ @@ -95,10 +164,97 @@ __after_proc_init: #endif mcr p15, 0, r0, c1, c0, 0 @ write control reg #endif /* CONFIG_CPU_CP15 */ - - b __mmap_switched @ clear the BSS and jump - @ to start_kernel + mov pc, r13 ENDPROC(__after_proc_init) .ltorg +#ifdef CONFIG_ARM_MPU + + +/* Set which MPU region should be programmed */ +.macro set_region_nr tmp, rgnr + mov \tmp, \rgnr @ Use static region numbers + mcr p15, 0, \tmp, c6, c2, 0 @ Write RGNR +.endm + +/* Setup a single MPU region, either D or I side (D-side for unified) */ +.macro setup_region bar, acr, sr, side = MPU_DATA_SIDE + mcr p15, 0, \bar, c6, c1, (0 + \side) @ I/DRBAR + mcr p15, 0, \acr, c6, c1, (4 + \side) @ I/DRACR + mcr p15, 0, \sr, c6, c1, (2 + \side) @ I/DRSR +.endm + +/* + * Setup the MPU and initial MPU Regions. We create the following regions: + * Region 0: Use this for probing the MPU details, so leave disabled. + * Region 1: Background region - covers the whole of RAM as strongly ordered + * Region 2: Normal, Shared, cacheable for RAM. From PHYS_OFFSET, size from r6 + * Region 3: Normal, shared, inaccessible from PL0 to protect the vectors page + * + * r6: Value to be written to DRSR (and IRSR if required) for MPU_RAM_REGION +*/ + +ENTRY(__setup_mpu) + + /* Probe for v7 PMSA compliance */ + mrc p15, 0, r0, c0, c1, 4 @ Read ID_MMFR0 + and r0, r0, #(MMFR0_PMSA) @ PMSA field + teq r0, #(MMFR0_PMSAv7) @ PMSA v7 + bne __error_p @ Fail: ARM_MPU on NOT v7 PMSA + + /* Determine whether the D/I-side memory map is unified. We set the + * flags here and continue to use them for the rest of this function */ + mrc p15, 0, r0, c0, c0, 4 @ MPUIR + ands r5, r0, #MPUIR_DREGION_SZMASK @ 0 size d region => No MPU + beq __error_p @ Fail: ARM_MPU and no MPU + tst r0, #MPUIR_nU @ MPUIR_nU = 0 for unified + + /* Setup second region first to free up r6 */ + set_region_nr r0, #MPU_RAM_REGION + isb + /* Full access from PL0, PL1, shared for CONFIG_SMP, cacheable */ + ldr r0, =PHYS_OFFSET @ RAM starts at PHYS_OFFSET + ldr r5,=(MPU_AP_PL1RW_PL0RW | MPU_RGN_NORMAL) + + setup_region r0, r5, r6, MPU_DATA_SIDE @ PHYS_OFFSET, shared, enabled + beq 1f @ Memory-map not unified + setup_region r0, r5, r6, MPU_INSTR_SIDE @ PHYS_OFFSET, shared, enabled +1: isb + + /* First/background region */ + set_region_nr r0, #MPU_BG_REGION + isb + /* Execute Never, strongly ordered, inaccessible to PL0, rw PL1 */ + mov r0, #0 @ BG region starts at 0x0 + ldr r5,=(MPU_ACR_XN | MPU_RGN_STRONGLY_ORDERED | MPU_AP_PL1RW_PL0NA) + mov r6, #MPU_RSR_ALL_MEM @ 4GB region, enabled + + setup_region r0, r5, r6, MPU_DATA_SIDE @ 0x0, BG region, enabled + beq 2f @ Memory-map not unified + setup_region r0, r5, r6, MPU_INSTR_SIDE @ 0x0, BG region, enabled +2: isb + + /* Vectors region */ + set_region_nr r0, #MPU_VECTORS_REGION + isb + /* Shared, inaccessible to PL0, rw PL1 */ + mov r0, #CONFIG_VECTORS_BASE @ Cover from VECTORS_BASE + ldr r5,=(MPU_AP_PL1RW_PL0NA | MPU_RGN_NORMAL) + /* Writing N to bits 5:1 (RSR_SZ) --> region size 2^N+1 */ + mov r6, #(((PAGE_SHIFT - 1) << MPU_RSR_SZ) | 1 << MPU_RSR_EN) + + setup_region r0, r5, r6, MPU_DATA_SIDE @ VECTORS_BASE, PL0 NA, enabled + beq 3f @ Memory-map not unified + setup_region r0, r5, r6, MPU_INSTR_SIDE @ VECTORS_BASE, PL0 NA, enabled +3: isb + + /* Enable the MPU */ + mrc p15, 0, r0, c1, c0, 0 @ Read SCTLR + bic r0, r0, #CR_BR @ Disable the 'default mem-map' + orr r0, r0, #CR_M @ Set SCTRL.M (MPU on) + mcr p15, 0, r0, c1, c0, 0 @ Enable MPU + isb + mov pc,lr +ENDPROC(__setup_mpu) +#endif #include "head-common.S" diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index 8bac553fe213..45e8935cae4e 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -156,7 +156,7 @@ ENDPROC(stext) * * Returns: * r0, r3, r5-r7 corrupted - * r4 = physical page table address + * r4 = page table (see ARCH_PGD_SHIFT in asm/memory.h) */ __create_page_tables: pgtbl r4, r8 @ page table address @@ -331,6 +331,7 @@ __create_page_tables: #endif #ifdef CONFIG_ARM_LPAE sub r4, r4, #0x1000 @ point to the PGD table + mov r4, r4, lsr #ARCH_PGD_SHIFT #endif mov pc, lr ENDPROC(__create_page_tables) @@ -408,7 +409,7 @@ __secondary_data: * r0 = cp#15 control register * r1 = machine ID * r2 = atags or dtb pointer - * r4 = page table pointer + * r4 = page table (see ARCH_PGD_SHIFT in asm/memory.h) * r9 = processor ID * r13 = *virtual* address to jump to upon completion */ @@ -427,10 +428,7 @@ __enable_mmu: #ifdef CONFIG_CPU_ICACHE_DISABLE bic r0, r0, #CR_I #endif -#ifdef CONFIG_ARM_LPAE - mov r5, #0 - mcrr p15, 0, r4, r5, c2 @ load TTBR0 -#else +#ifndef CONFIG_ARM_LPAE mov r5, #(domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \ domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ domain_val(DOMAIN_TABLE, DOMAIN_MANAGER) | \ diff --git a/arch/arm/kernel/psci.c b/arch/arm/kernel/psci.c index 36531643cc2c..46931880093d 100644 --- a/arch/arm/kernel/psci.c +++ b/arch/arm/kernel/psci.c @@ -158,7 +158,7 @@ static const struct of_device_id psci_of_match[] __initconst = { {}, }; -static int __init psci_init(void) +void __init psci_init(void) { struct device_node *np; const char *method; @@ -166,7 +166,7 @@ static int __init psci_init(void) np = of_find_matching_node(NULL, psci_of_match); if (!np) - return 0; + return; pr_info("probing function IDs from device-tree\n"); @@ -206,6 +206,5 @@ static int __init psci_init(void) out_put_node: of_node_put(np); - return 0; + return; } -early_initcall(psci_init); diff --git a/arch/arm/kernel/psci_smp.c b/arch/arm/kernel/psci_smp.c new file mode 100644 index 000000000000..219f1d73572a --- /dev/null +++ b/arch/arm/kernel/psci_smp.c @@ -0,0 +1,84 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * Copyright (C) 2012 ARM Limited + * + * Author: Will Deacon <will.deacon@arm.com> + */ + +#include <linux/init.h> +#include <linux/irqchip/arm-gic.h> +#include <linux/smp.h> +#include <linux/of.h> + +#include <asm/psci.h> +#include <asm/smp_plat.h> + +/* + * psci_smp assumes that the following is true about PSCI: + * + * cpu_suspend Suspend the execution on a CPU + * @state we don't currently describe affinity levels, so just pass 0. + * @entry_point the first instruction to be executed on return + * returns 0 success, < 0 on failure + * + * cpu_off Power down a CPU + * @state we don't currently describe affinity levels, so just pass 0. + * no return on successful call + * + * cpu_on Power up a CPU + * @cpuid cpuid of target CPU, as from MPIDR + * @entry_point the first instruction to be executed on return + * returns 0 success, < 0 on failure + * + * migrate Migrate the context to a different CPU + * @cpuid cpuid of target CPU, as from MPIDR + * returns 0 success, < 0 on failure + * + */ + +extern void secondary_startup(void); + +static int __cpuinit psci_boot_secondary(unsigned int cpu, + struct task_struct *idle) +{ + if (psci_ops.cpu_on) + return psci_ops.cpu_on(cpu_logical_map(cpu), + __pa(secondary_startup)); + return -ENODEV; +} + +#ifdef CONFIG_HOTPLUG_CPU +void __ref psci_cpu_die(unsigned int cpu) +{ + const struct psci_power_state ps = { + .type = PSCI_POWER_STATE_TYPE_POWER_DOWN, + }; + + if (psci_ops.cpu_off) + psci_ops.cpu_off(ps); + + /* We should never return */ + panic("psci: cpu %d failed to shutdown\n", cpu); +} +#endif + +bool __init psci_smp_available(void) +{ + /* is cpu_on available at least? */ + return (psci_ops.cpu_on != NULL); +} + +struct smp_operations __initdata psci_smp_ops = { + .smp_boot_secondary = psci_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_die = psci_cpu_die, +#endif +}; diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 1522c7ae31b0..ca34224f891f 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -37,6 +37,7 @@ #include <asm/cputype.h> #include <asm/elf.h> #include <asm/procinfo.h> +#include <asm/psci.h> #include <asm/sections.h> #include <asm/setup.h> #include <asm/smp_plat.h> @@ -128,7 +129,9 @@ struct stack { u32 und[3]; } ____cacheline_aligned; +#ifndef CONFIG_CPU_V7M static struct stack stacks[NR_CPUS]; +#endif char elf_platform[ELF_PLATFORM_SIZE]; EXPORT_SYMBOL(elf_platform); @@ -207,7 +210,7 @@ static const char *proc_arch[] = { "5TEJ", "6TEJ", "7", - "?(11)", + "7M", "?(12)", "?(13)", "?(14)", @@ -216,6 +219,12 @@ static const char *proc_arch[] = { "?(17)", }; +#ifdef CONFIG_CPU_V7M +static int __get_cpu_architecture(void) +{ + return CPU_ARCH_ARMv7M; +} +#else static int __get_cpu_architecture(void) { int cpu_arch; @@ -248,6 +257,7 @@ static int __get_cpu_architecture(void) return cpu_arch; } +#endif int __pure cpu_architecture(void) { @@ -293,7 +303,9 @@ static void __init cacheid_init(void) { unsigned int arch = cpu_architecture(); - if (arch >= CPU_ARCH_ARMv6) { + if (arch == CPU_ARCH_ARMv7M) { + cacheid = 0; + } else if (arch >= CPU_ARCH_ARMv6) { unsigned int cachetype = read_cpuid_cachetype(); if ((cachetype & (7 << 29)) == 4 << 29) { /* ARMv7 register format */ @@ -355,7 +367,7 @@ void __init early_print(const char *str, ...) static void __init cpuid_init_hwcaps(void) { - unsigned int divide_instrs; + unsigned int divide_instrs, vmsa; if (cpu_architecture() < CPU_ARCH_ARMv7) return; @@ -368,6 +380,11 @@ static void __init cpuid_init_hwcaps(void) case 1: elf_hwcap |= HWCAP_IDIVT; } + + /* LPAE implies atomic ldrd/strd instructions */ + vmsa = (read_cpuid_ext(CPUID_EXT_MMFR0) & 0xf) >> 0; + if (vmsa >= 5) + elf_hwcap |= HWCAP_LPAE; } static void __init feat_v6_fixup(void) @@ -392,6 +409,7 @@ static void __init feat_v6_fixup(void) */ void notrace cpu_init(void) { +#ifndef CONFIG_CPU_V7M unsigned int cpu = smp_processor_id(); struct stack *stk = &stacks[cpu]; @@ -442,6 +460,7 @@ void notrace cpu_init(void) "I" (offsetof(struct stack, und[0])), PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE) : "r14"); +#endif } int __cpu_logical_map[NR_CPUS]; @@ -796,9 +815,15 @@ void __init setup_arch(char **cmdline_p) unflatten_device_tree(); arm_dt_init_cpu_maps(); + psci_init(); #ifdef CONFIG_SMP if (is_smp()) { - smp_set_ops(mdesc->smp); + if (!mdesc->smp_init || !mdesc->smp_init()) { + if (psci_smp_available()) + smp_set_ops(&psci_smp_ops); + else if (mdesc->smp) + smp_set_ops(mdesc->smp); + } smp_init_cpus(); } #endif @@ -872,6 +897,7 @@ static const char *hwcap_str[] = { "vfpv4", "idiva", "idivt", + "lpae", NULL }; diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c index 296786bdbb73..1c16c35c271a 100644 --- a/arch/arm/kernel/signal.c +++ b/arch/arm/kernel/signal.c @@ -392,14 +392,19 @@ setup_return(struct pt_regs *regs, struct ksignal *ksig, if (ksig->ka.sa.sa_flags & SA_SIGINFO) idx += 3; + /* + * Put the sigreturn code on the stack no matter which return + * mechanism we use in order to remain ABI compliant + */ if (__put_user(sigreturn_codes[idx], rc) || __put_user(sigreturn_codes[idx+1], rc+1)) return 1; - if (cpsr & MODE32_BIT) { + if ((cpsr & MODE32_BIT) && !IS_ENABLED(CONFIG_ARM_MPU)) { /* * 32-bit code can use the new high-page - * signal return code support. + * signal return code support except when the MPU has + * protected the vectors page from PL0 */ retcode = KERN_SIGRETURN_CODE + (idx << 2) + thumb; } else { diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 550d63cef68e..32af17932a7a 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -45,6 +45,7 @@ #include <asm/smp_plat.h> #include <asm/virt.h> #include <asm/mach/arch.h> +#include <asm/mpu.h> /* * as from 2.5, kernels no longer have an init_tasks structure @@ -78,6 +79,13 @@ void __init smp_set_ops(struct smp_operations *ops) smp_ops = *ops; }; +static unsigned long get_arch_pgd(pgd_t *pgd) +{ + phys_addr_t pgdir = virt_to_phys(pgd); + BUG_ON(pgdir & ARCH_PGD_MASK); + return pgdir >> ARCH_PGD_SHIFT; +} + int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *idle) { int ret; @@ -87,8 +95,14 @@ int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *idle) * its stack and the page tables. */ secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; - secondary_data.pgdir = virt_to_phys(idmap_pgd); - secondary_data.swapper_pg_dir = virt_to_phys(swapper_pg_dir); +#ifdef CONFIG_ARM_MPU + secondary_data.mpu_rgn_szr = mpu_rgn_info.rgns[MPU_RAM_REGION].drsr; +#endif + +#ifdef CONFIG_MMU + secondary_data.pgdir = get_arch_pgd(idmap_pgd); + secondary_data.swapper_pg_dir = get_arch_pgd(swapper_pg_dir); +#endif __cpuc_flush_dcache_area(&secondary_data, sizeof(secondary_data)); outer_clean_range(__pa(&secondary_data), __pa(&secondary_data + 1)); @@ -112,9 +126,8 @@ int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *idle) pr_err("CPU%u: failed to boot: %d\n", cpu, ret); } - secondary_data.stack = NULL; - secondary_data.pgdir = 0; + memset(&secondary_data, 0, sizeof(secondary_data)); return ret; } diff --git a/arch/arm/kernel/suspend.c b/arch/arm/kernel/suspend.c index c59c97ea8268..38a50676213b 100644 --- a/arch/arm/kernel/suspend.c +++ b/arch/arm/kernel/suspend.c @@ -10,6 +10,42 @@ extern int __cpu_suspend(unsigned long, int (*)(unsigned long)); extern void cpu_resume_mmu(void); +#ifdef CONFIG_MMU +/* + * Hide the first two arguments to __cpu_suspend - these are an implementation + * detail which platform code shouldn't have to know about. + */ +int cpu_suspend(unsigned long arg, int (*fn)(unsigned long)) +{ + struct mm_struct *mm = current->active_mm; + int ret; + + if (!idmap_pgd) + return -EINVAL; + + /* + * Provide a temporary page table with an identity mapping for + * the MMU-enable code, required for resuming. On successful + * resume (indicated by a zero return code), we need to switch + * back to the correct page tables. + */ + ret = __cpu_suspend(arg, fn); + if (ret == 0) { + cpu_switch_mm(mm->pgd, mm); + local_flush_bp_all(); + local_flush_tlb_all(); + } + + return ret; +} +#else +int cpu_suspend(unsigned long arg, int (*fn)(unsigned long)) +{ + return __cpu_suspend(arg, fn); +} +#define idmap_pgd NULL +#endif + /* * This is called by __cpu_suspend() to save the state, and do whatever * flushing is required to ensure that when the CPU goes to sleep we have @@ -46,31 +82,3 @@ void __cpu_suspend_save(u32 *ptr, u32 ptrsz, u32 sp, u32 *save_ptr) outer_clean_range(virt_to_phys(save_ptr), virt_to_phys(save_ptr) + sizeof(*save_ptr)); } - -/* - * Hide the first two arguments to __cpu_suspend - these are an implementation - * detail which platform code shouldn't have to know about. - */ -int cpu_suspend(unsigned long arg, int (*fn)(unsigned long)) -{ - struct mm_struct *mm = current->active_mm; - int ret; - - if (!idmap_pgd) - return -EINVAL; - - /* - * Provide a temporary page table with an identity mapping for - * the MMU-enable code, required for resuming. On successful - * resume (indicated by a zero return code), we need to switch - * back to the correct page tables. - */ - ret = __cpu_suspend(arg, fn); - if (ret == 0) { - cpu_switch_mm(mm->pgd, mm); - local_flush_bp_all(); - local_flush_tlb_all(); - } - - return ret; -} diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 18b32e8e4497..486e12a0f26a 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -812,6 +812,7 @@ static void __init kuser_get_tls_init(unsigned long vectors) void __init early_trap_init(void *vectors_base) { +#ifndef CONFIG_CPU_V7M unsigned long vectors = (unsigned long)vectors_base; extern char __stubs_start[], __stubs_end[]; extern char __vectors_start[], __vectors_end[]; @@ -843,4 +844,11 @@ void __init early_trap_init(void *vectors_base) flush_icache_range(vectors, vectors + PAGE_SIZE); modify_domain(DOMAIN_USER, DOMAIN_CLIENT); +#else /* ifndef CONFIG_CPU_V7M */ + /* + * on V7-M there is no need to copy the vector table to a dedicated + * memory area. The address is configurable and so a table in the kernel + * image can be used. + */ +#endif } diff --git a/arch/arm/mach-virt/Makefile b/arch/arm/mach-virt/Makefile index 042afc1f8c44..7ddbfa60227f 100644 --- a/arch/arm/mach-virt/Makefile +++ b/arch/arm/mach-virt/Makefile @@ -3,4 +3,3 @@ # obj-y := virt.o -obj-$(CONFIG_SMP) += platsmp.o diff --git a/arch/arm/mach-virt/platsmp.c b/arch/arm/mach-virt/platsmp.c deleted file mode 100644 index f4143f5bfa5b..000000000000 --- a/arch/arm/mach-virt/platsmp.c +++ /dev/null @@ -1,50 +0,0 @@ -/* - * Dummy Virtual Machine - does what it says on the tin. - * - * Copyright (C) 2012 ARM Ltd - * Author: Will Deacon <will.deacon@arm.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ - -#include <linux/init.h> -#include <linux/smp.h> -#include <linux/of.h> - -#include <asm/psci.h> -#include <asm/smp_plat.h> - -extern void secondary_startup(void); - -static void __init virt_smp_init_cpus(void) -{ -} - -static void __init virt_smp_prepare_cpus(unsigned int max_cpus) -{ -} - -static int __cpuinit virt_boot_secondary(unsigned int cpu, - struct task_struct *idle) -{ - if (psci_ops.cpu_on) - return psci_ops.cpu_on(cpu_logical_map(cpu), - __pa(secondary_startup)); - return -ENODEV; -} - -struct smp_operations __initdata virt_smp_ops = { - .smp_init_cpus = virt_smp_init_cpus, - .smp_prepare_cpus = virt_smp_prepare_cpus, - .smp_boot_secondary = virt_boot_secondary, -}; diff --git a/arch/arm/mach-virt/virt.c b/arch/arm/mach-virt/virt.c index 061f283f579e..a67d2dd5bb60 100644 --- a/arch/arm/mach-virt/virt.c +++ b/arch/arm/mach-virt/virt.c @@ -36,11 +36,8 @@ static const char *virt_dt_match[] = { NULL }; -extern struct smp_operations virt_smp_ops; - DT_MACHINE_START(VIRT, "Dummy Virtual Machine") .init_irq = irqchip_init, .init_machine = virt_init, - .smp = smp_ops(virt_smp_ops), .dt_compat = virt_dt_match, MACHINE_END diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 35955b54944c..6cacdc8dd654 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -392,11 +392,21 @@ config CPU_V7 select CPU_CACHE_V7 select CPU_CACHE_VIPT select CPU_COPY_V6 if MMU - select CPU_CP15_MMU + select CPU_CP15_MMU if MMU + select CPU_CP15_MPU if !MMU select CPU_HAS_ASID if MMU select CPU_PABRT_V7 select CPU_TLB_V7 if MMU +# ARMv7M +config CPU_V7M + bool + select CPU_32v7M + select CPU_ABRT_NOMMU + select CPU_CACHE_NOP + select CPU_PABRT_LEGACY + select CPU_THUMBONLY + config CPU_THUMBONLY bool # There are no CPUs available with MMU that don't implement an ARM ISA: @@ -441,6 +451,9 @@ config CPU_32v6K config CPU_32v7 bool +config CPU_32v7M + bool + # The abort model config CPU_ABRT_NOMMU bool @@ -491,6 +504,9 @@ config CPU_CACHE_V6 config CPU_CACHE_V7 bool +config CPU_CACHE_NOP + bool + config CPU_CACHE_VIVT bool @@ -613,7 +629,11 @@ config ARCH_DMA_ADDR_T_64BIT config ARM_THUMB bool "Support Thumb user binaries" if !CPU_THUMBONLY - depends on CPU_ARM720T || CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM946E || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_V6 || CPU_V6K || CPU_V7 || CPU_FEROCEON + depends on CPU_ARM720T || CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || \ + CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM946E || \ + CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \ + CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_V6 || CPU_V6K || \ + CPU_V7 || CPU_FEROCEON || CPU_V7M default y help Say Y if you want to include kernel support for running user space diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile index 9e51be96f635..ecfe6e53f6e0 100644 --- a/arch/arm/mm/Makefile +++ b/arch/arm/mm/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_MODULES) += proc-syms.o obj-$(CONFIG_ALIGNMENT_TRAP) += alignment.o obj-$(CONFIG_HIGHMEM) += highmem.o +obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o obj-$(CONFIG_CPU_ABRT_NOMMU) += abort-nommu.o obj-$(CONFIG_CPU_ABRT_EV4) += abort-ev4.o @@ -39,6 +40,7 @@ obj-$(CONFIG_CPU_CACHE_V4WB) += cache-v4wb.o obj-$(CONFIG_CPU_CACHE_V6) += cache-v6.o obj-$(CONFIG_CPU_CACHE_V7) += cache-v7.o obj-$(CONFIG_CPU_CACHE_FA) += cache-fa.o +obj-$(CONFIG_CPU_CACHE_NOP) += cache-nop.o AFLAGS_cache-v6.o :=-Wa,-march=armv6 AFLAGS_cache-v7.o :=-Wa,-march=armv7-a @@ -87,6 +89,7 @@ obj-$(CONFIG_CPU_FEROCEON) += proc-feroceon.o obj-$(CONFIG_CPU_V6) += proc-v6.o obj-$(CONFIG_CPU_V6K) += proc-v6.o obj-$(CONFIG_CPU_V7) += proc-v7.o +obj-$(CONFIG_CPU_V7M) += proc-v7m.o AFLAGS_proc-v6.o :=-Wa,-march=armv6 AFLAGS_proc-v7.o :=-Wa,-march=armv7-a diff --git a/arch/arm/mm/cache-nop.S b/arch/arm/mm/cache-nop.S new file mode 100644 index 000000000000..8e12ddca0031 --- /dev/null +++ b/arch/arm/mm/cache-nop.S @@ -0,0 +1,50 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/linkage.h> +#include <linux/init.h> + +#include "proc-macros.S" + +ENTRY(nop_flush_icache_all) + mov pc, lr +ENDPROC(nop_flush_icache_all) + + .globl nop_flush_kern_cache_all + .equ nop_flush_kern_cache_all, nop_flush_icache_all + + .globl nop_flush_kern_cache_louis + .equ nop_flush_kern_cache_louis, nop_flush_icache_all + + .globl nop_flush_user_cache_all + .equ nop_flush_user_cache_all, nop_flush_icache_all + + .globl nop_flush_user_cache_range + .equ nop_flush_user_cache_range, nop_flush_icache_all + + .globl nop_coherent_kern_range + .equ nop_coherent_kern_range, nop_flush_icache_all + +ENTRY(nop_coherent_user_range) + mov r0, 0 + mov pc, lr +ENDPROC(nop_coherent_user_range) + + .globl nop_flush_kern_dcache_area + .equ nop_flush_kern_dcache_area, nop_flush_icache_all + + .globl nop_dma_flush_range + .equ nop_dma_flush_range, nop_flush_icache_all + + .globl nop_dma_map_area + .equ nop_dma_map_area, nop_flush_icache_all + + .globl nop_dma_unmap_area + .equ nop_dma_unmap_area, nop_flush_icache_all + + __INITDATA + + @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S) + define_cache_functions nop diff --git a/arch/arm/mm/context.c b/arch/arm/mm/context.c index 2ac37372ef52..3675e31473e3 100644 --- a/arch/arm/mm/context.c +++ b/arch/arm/mm/context.c @@ -20,6 +20,7 @@ #include <asm/smp_plat.h> #include <asm/thread_notify.h> #include <asm/tlbflush.h> +#include <asm/proc-fns.h> /* * On ARMv6, we have the following structure in the Context ID: @@ -55,17 +56,11 @@ static cpumask_t tlb_flush_pending; #ifdef CONFIG_ARM_LPAE static void cpu_set_reserved_ttbr0(void) { - unsigned long ttbl = __pa(swapper_pg_dir); - unsigned long ttbh = 0; - /* * Set TTBR0 to swapper_pg_dir which contains only global entries. The * ASID is set to 0. */ - asm volatile( - " mcrr p15, 0, %0, %1, c2 @ set TTBR0\n" - : - : "r" (ttbl), "r" (ttbh)); + cpu_set_ttbr(0, __pa(swapper_pg_dir)); isb(); } #else diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index ef3e0f3aac96..9674476a75dc 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -250,7 +250,7 @@ static void __dma_free_buffer(struct page *page, size_t size) #ifdef CONFIG_MMU #ifdef CONFIG_HUGETLB_PAGE -#error ARM Coherent DMA allocator does not (yet) support huge TLB +#warning ARM Coherent DMA allocator does not (yet) support huge TLB #endif static void *__alloc_from_contiguous(struct device *dev, size_t size, diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c index 0d473cce501c..370640780d57 100644 --- a/arch/arm/mm/flush.c +++ b/arch/arm/mm/flush.c @@ -17,6 +17,7 @@ #include <asm/highmem.h> #include <asm/smp_plat.h> #include <asm/tlbflush.h> +#include <linux/hugetlb.h> #include "mm.h" @@ -168,19 +169,23 @@ void __flush_dcache_page(struct address_space *mapping, struct page *page) * coherent with the kernels mapping. */ if (!PageHighMem(page)) { - __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE); + size_t page_size = PAGE_SIZE << compound_order(page); + __cpuc_flush_dcache_area(page_address(page), page_size); } else { - void *addr; - + unsigned long i; if (cache_is_vipt_nonaliasing()) { - addr = kmap_atomic(page); - __cpuc_flush_dcache_area(addr, PAGE_SIZE); - kunmap_atomic(addr); - } else { - addr = kmap_high_get(page); - if (addr) { + for (i = 0; i < (1 << compound_order(page)); i++) { + void *addr = kmap_atomic(page); __cpuc_flush_dcache_area(addr, PAGE_SIZE); - kunmap_high(page); + kunmap_atomic(addr); + } + } else { + for (i = 0; i < (1 << compound_order(page)); i++) { + void *addr = kmap_high_get(page); + if (addr) { + __cpuc_flush_dcache_area(addr, PAGE_SIZE); + kunmap_high(page); + } } } } diff --git a/arch/arm/mm/fsr-3level.c b/arch/arm/mm/fsr-3level.c index 05a4e9431836..ab4409a2307e 100644 --- a/arch/arm/mm/fsr-3level.c +++ b/arch/arm/mm/fsr-3level.c @@ -9,11 +9,11 @@ static struct fsr_info fsr_info[] = { { do_page_fault, SIGSEGV, SEGV_MAPERR, "level 3 translation fault" }, { do_bad, SIGBUS, 0, "reserved access flag fault" }, { do_bad, SIGSEGV, SEGV_ACCERR, "level 1 access flag fault" }, - { do_bad, SIGSEGV, SEGV_ACCERR, "level 2 access flag fault" }, + { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 2 access flag fault" }, { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 3 access flag fault" }, { do_bad, SIGBUS, 0, "reserved permission fault" }, { do_bad, SIGSEGV, SEGV_ACCERR, "level 1 permission fault" }, - { do_sect_fault, SIGSEGV, SEGV_ACCERR, "level 2 permission fault" }, + { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 2 permission fault" }, { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 3 permission fault" }, { do_bad, SIGBUS, 0, "synchronous external abort" }, { do_bad, SIGBUS, 0, "asynchronous external abort" }, diff --git a/arch/arm/mm/hugetlbpage.c b/arch/arm/mm/hugetlbpage.c new file mode 100644 index 000000000000..3d1e4a205b0b --- /dev/null +++ b/arch/arm/mm/hugetlbpage.c @@ -0,0 +1,101 @@ +/* + * arch/arm/mm/hugetlbpage.c + * + * Copyright (C) 2012 ARM Ltd. + * + * Based on arch/x86/include/asm/hugetlb.h and Bill Carson's patches + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/hugetlb.h> +#include <linux/pagemap.h> +#include <linux/err.h> +#include <linux/sysctl.h> +#include <asm/mman.h> +#include <asm/tlb.h> +#include <asm/tlbflush.h> +#include <asm/pgalloc.h> + +/* + * On ARM, huge pages are backed by pmd's rather than pte's, so we do a lot + * of type casting from pmd_t * to pte_t *. + */ + +pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd = NULL; + + pgd = pgd_offset(mm, addr); + if (pgd_present(*pgd)) { + pud = pud_offset(pgd, addr); + if (pud_present(*pud)) + pmd = pmd_offset(pud, addr); + } + + return (pte_t *)pmd; +} + +struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, + int write) +{ + return ERR_PTR(-EINVAL); +} + +int pud_huge(pud_t pud) +{ + return 0; +} + +int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) +{ + return 0; +} + +pte_t *huge_pte_alloc(struct mm_struct *mm, + unsigned long addr, unsigned long sz) +{ + pgd_t *pgd; + pud_t *pud; + pte_t *pte = NULL; + + pgd = pgd_offset(mm, addr); + pud = pud_alloc(mm, pgd, addr); + if (pud) + pte = (pte_t *)pmd_alloc(mm, pud, addr); + + return pte; +} + +struct page * +follow_huge_pmd(struct mm_struct *mm, unsigned long address, + pmd_t *pmd, int write) +{ + struct page *page; + + page = pte_page(*(pte_t *)pmd); + if (page) + page += ((address & ~PMD_MASK) >> PAGE_SHIFT); + return page; +} + +int pmd_huge(pmd_t pmd) +{ + return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT); +} diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c index 9a5cdc01fcdf..2ffee02d1d5c 100644 --- a/arch/arm/mm/init.c +++ b/arch/arm/mm/init.c @@ -36,12 +36,13 @@ #include "mm.h" -static unsigned long phys_initrd_start __initdata = 0; +static phys_addr_t phys_initrd_start __initdata = 0; static unsigned long phys_initrd_size __initdata = 0; static int __init early_initrd(char *p) { - unsigned long start, size; + phys_addr_t start; + unsigned long size; char *endp; start = memparse(p, &endp); @@ -350,14 +351,14 @@ void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) #ifdef CONFIG_BLK_DEV_INITRD if (phys_initrd_size && !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { - pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n", - phys_initrd_start, phys_initrd_size); + pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", + (u64)phys_initrd_start, phys_initrd_size); phys_initrd_start = phys_initrd_size = 0; } if (phys_initrd_size && memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { - pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", - phys_initrd_start, phys_initrd_size); + pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", + (u64)phys_initrd_start, phys_initrd_size); phys_initrd_start = phys_initrd_size = 0; } if (phys_initrd_size) { @@ -442,7 +443,7 @@ static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) { struct page *start_pg, *end_pg; - unsigned long pg, pgend; + phys_addr_t pg, pgend; /* * Convert start_pfn/end_pfn to a struct page pointer. @@ -454,8 +455,8 @@ free_memmap(unsigned long start_pfn, unsigned long end_pfn) * Convert to physical addresses, and * round start upwards and end downwards. */ - pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); - pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; + pg = PAGE_ALIGN(__pa(start_pg)); + pgend = __pa(end_pg) & PAGE_MASK; /* * If there are free pages between these, diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index e0d8565671a6..280f91d02de2 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -673,7 +673,8 @@ static void __init alloc_init_pmd(pud_t *pud, unsigned long addr, } static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr, - unsigned long end, unsigned long phys, const struct mem_type *type) + unsigned long end, phys_addr_t phys, + const struct mem_type *type) { pud_t *pud = pud_offset(pgd, addr); unsigned long next; @@ -987,27 +988,28 @@ phys_addr_t arm_lowmem_limit __initdata = 0; void __init sanity_check_meminfo(void) { int i, j, highmem = 0; + phys_addr_t vmalloc_limit = __pa(vmalloc_min - 1) + 1; for (i = 0, j = 0; i < meminfo.nr_banks; i++) { struct membank *bank = &meminfo.bank[j]; - *bank = meminfo.bank[i]; + phys_addr_t size_limit; - if (bank->start > ULONG_MAX) - highmem = 1; + *bank = meminfo.bank[i]; + size_limit = bank->size; -#ifdef CONFIG_HIGHMEM - if (__va(bank->start) >= vmalloc_min || - __va(bank->start) < (void *)PAGE_OFFSET) + if (bank->start >= vmalloc_limit) highmem = 1; + else + size_limit = vmalloc_limit - bank->start; bank->highmem = highmem; +#ifdef CONFIG_HIGHMEM /* * Split those memory banks which are partially overlapping * the vmalloc area greatly simplifying things later. */ - if (!highmem && __va(bank->start) < vmalloc_min && - bank->size > vmalloc_min - __va(bank->start)) { + if (!highmem && bank->size > size_limit) { if (meminfo.nr_banks >= NR_BANKS) { printk(KERN_CRIT "NR_BANKS too low, " "ignoring high memory\n"); @@ -1016,16 +1018,14 @@ void __init sanity_check_meminfo(void) (meminfo.nr_banks - i) * sizeof(*bank)); meminfo.nr_banks++; i++; - bank[1].size -= vmalloc_min - __va(bank->start); - bank[1].start = __pa(vmalloc_min - 1) + 1; + bank[1].size -= size_limit; + bank[1].start = vmalloc_limit; bank[1].highmem = highmem = 1; j++; } - bank->size = vmalloc_min - __va(bank->start); + bank->size = size_limit; } #else - bank->highmem = highmem; - /* * Highmem banks not allowed with !CONFIG_HIGHMEM. */ @@ -1038,31 +1038,16 @@ void __init sanity_check_meminfo(void) } /* - * Check whether this memory bank would entirely overlap - * the vmalloc area. - */ - if (__va(bank->start) >= vmalloc_min || - __va(bank->start) < (void *)PAGE_OFFSET) { - printk(KERN_NOTICE "Ignoring RAM at %.8llx-%.8llx " - "(vmalloc region overlap).\n", - (unsigned long long)bank->start, - (unsigned long long)bank->start + bank->size - 1); - continue; - } - - /* * Check whether this memory bank would partially overlap * the vmalloc area. */ - if (__va(bank->start + bank->size - 1) >= vmalloc_min || - __va(bank->start + bank->size - 1) <= __va(bank->start)) { - unsigned long newsize = vmalloc_min - __va(bank->start); + if (bank->size > size_limit) { printk(KERN_NOTICE "Truncating RAM at %.8llx-%.8llx " "to -%.8llx (vmalloc region overlap).\n", (unsigned long long)bank->start, (unsigned long long)bank->start + bank->size - 1, - (unsigned long long)bank->start + newsize - 1); - bank->size = newsize; + (unsigned long long)bank->start + size_limit - 1); + bank->size = size_limit; } #endif if (!bank->highmem && bank->start + bank->size > arm_lowmem_limit) diff --git a/arch/arm/mm/nommu.c b/arch/arm/mm/nommu.c index d51225f90ae2..c1b494d43ed1 100644 --- a/arch/arm/mm/nommu.c +++ b/arch/arm/mm/nommu.c @@ -8,6 +8,7 @@ #include <linux/pagemap.h> #include <linux/io.h> #include <linux/memblock.h> +#include <linux/kernel.h> #include <asm/cacheflush.h> #include <asm/sections.h> @@ -15,22 +16,282 @@ #include <asm/setup.h> #include <asm/traps.h> #include <asm/mach/arch.h> +#include <asm/cputype.h> +#include <asm/mpu.h> #include "mm.h" +#ifdef CONFIG_ARM_MPU +struct mpu_rgn_info mpu_rgn_info; + +/* Region number */ +static void rgnr_write(u32 v) +{ + asm("mcr p15, 0, %0, c6, c2, 0" : : "r" (v)); +} + +/* Data-side / unified region attributes */ + +/* Region access control register */ +static void dracr_write(u32 v) +{ + asm("mcr p15, 0, %0, c6, c1, 4" : : "r" (v)); +} + +/* Region size register */ +static void drsr_write(u32 v) +{ + asm("mcr p15, 0, %0, c6, c1, 2" : : "r" (v)); +} + +/* Region base address register */ +static void drbar_write(u32 v) +{ + asm("mcr p15, 0, %0, c6, c1, 0" : : "r" (v)); +} + +static u32 drbar_read(void) +{ + u32 v; + asm("mrc p15, 0, %0, c6, c1, 0" : "=r" (v)); + return v; +} +/* Optional instruction-side region attributes */ + +/* I-side Region access control register */ +static void iracr_write(u32 v) +{ + asm("mcr p15, 0, %0, c6, c1, 5" : : "r" (v)); +} + +/* I-side Region size register */ +static void irsr_write(u32 v) +{ + asm("mcr p15, 0, %0, c6, c1, 3" : : "r" (v)); +} + +/* I-side Region base address register */ +static void irbar_write(u32 v) +{ + asm("mcr p15, 0, %0, c6, c1, 1" : : "r" (v)); +} + +static unsigned long irbar_read(void) +{ + unsigned long v; + asm("mrc p15, 0, %0, c6, c1, 1" : "=r" (v)); + return v; +} + +/* MPU initialisation functions */ +void __init sanity_check_meminfo_mpu(void) +{ + int i; + struct membank *bank = meminfo.bank; + phys_addr_t phys_offset = PHYS_OFFSET; + phys_addr_t aligned_region_size, specified_mem_size, rounded_mem_size; + + /* Initially only use memory continuous from PHYS_OFFSET */ + if (bank_phys_start(&bank[0]) != phys_offset) + panic("First memory bank must be contiguous from PHYS_OFFSET"); + + /* Banks have already been sorted by start address */ + for (i = 1; i < meminfo.nr_banks; i++) { + if (bank[i].start <= bank_phys_end(&bank[0]) && + bank_phys_end(&bank[i]) > bank_phys_end(&bank[0])) { + bank[0].size = bank_phys_end(&bank[i]) - bank[0].start; + } else { + pr_notice("Ignoring RAM after 0x%.8lx. " + "First non-contiguous (ignored) bank start: 0x%.8lx\n", + (unsigned long)bank_phys_end(&bank[0]), + (unsigned long)bank_phys_start(&bank[i])); + break; + } + } + /* All contiguous banks are now merged in to the first bank */ + meminfo.nr_banks = 1; + specified_mem_size = bank[0].size; + + /* + * MPU has curious alignment requirements: Size must be power of 2, and + * region start must be aligned to the region size + */ + if (phys_offset != 0) + pr_info("PHYS_OFFSET != 0 => MPU Region size constrained by alignment requirements\n"); + + /* + * Maximum aligned region might overflow phys_addr_t if phys_offset is + * 0. Hence we keep everything below 4G until we take the smaller of + * the aligned_region_size and rounded_mem_size, one of which is + * guaranteed to be smaller than the maximum physical address. + */ + aligned_region_size = (phys_offset - 1) ^ (phys_offset); + /* Find the max power-of-two sized region that fits inside our bank */ + rounded_mem_size = (1 << __fls(bank[0].size)) - 1; + + /* The actual region size is the smaller of the two */ + aligned_region_size = aligned_region_size < rounded_mem_size + ? aligned_region_size + 1 + : rounded_mem_size + 1; + + if (aligned_region_size != specified_mem_size) + pr_warn("Truncating memory from 0x%.8lx to 0x%.8lx (MPU region constraints)", + (unsigned long)specified_mem_size, + (unsigned long)aligned_region_size); + + meminfo.bank[0].size = aligned_region_size; + pr_debug("MPU Region from 0x%.8lx size 0x%.8lx (end 0x%.8lx))\n", + (unsigned long)phys_offset, + (unsigned long)aligned_region_size, + (unsigned long)bank_phys_end(&bank[0])); + +} + +static int mpu_present(void) +{ + return ((read_cpuid_ext(CPUID_EXT_MMFR0) & MMFR0_PMSA) == MMFR0_PMSAv7); +} + +static int mpu_max_regions(void) +{ + /* + * We don't support a different number of I/D side regions so if we + * have separate instruction and data memory maps then return + * whichever side has a smaller number of supported regions. + */ + u32 dregions, iregions, mpuir; + mpuir = read_cpuid(CPUID_MPUIR); + + dregions = iregions = (mpuir & MPUIR_DREGION_SZMASK) >> MPUIR_DREGION; + + /* Check for separate d-side and i-side memory maps */ + if (mpuir & MPUIR_nU) + iregions = (mpuir & MPUIR_IREGION_SZMASK) >> MPUIR_IREGION; + + /* Use the smallest of the two maxima */ + return min(dregions, iregions); +} + +static int mpu_iside_independent(void) +{ + /* MPUIR.nU specifies whether there is *not* a unified memory map */ + return read_cpuid(CPUID_MPUIR) & MPUIR_nU; +} + +static int mpu_min_region_order(void) +{ + u32 drbar_result, irbar_result; + /* We've kept a region free for this probing */ + rgnr_write(MPU_PROBE_REGION); + isb(); + /* + * As per ARM ARM, write 0xFFFFFFFC to DRBAR to find the minimum + * region order + */ + drbar_write(0xFFFFFFFC); + drbar_result = irbar_result = drbar_read(); + drbar_write(0x0); + /* If the MPU is non-unified, we use the larger of the two minima*/ + if (mpu_iside_independent()) { + irbar_write(0xFFFFFFFC); + irbar_result = irbar_read(); + irbar_write(0x0); + } + isb(); /* Ensure that MPU region operations have completed */ + /* Return whichever result is larger */ + return __ffs(max(drbar_result, irbar_result)); +} + +static int mpu_setup_region(unsigned int number, phys_addr_t start, + unsigned int size_order, unsigned int properties) +{ + u32 size_data; + + /* We kept a region free for probing resolution of MPU regions*/ + if (number > mpu_max_regions() || number == MPU_PROBE_REGION) + return -ENOENT; + + if (size_order > 32) + return -ENOMEM; + + if (size_order < mpu_min_region_order()) + return -ENOMEM; + + /* Writing N to bits 5:1 (RSR_SZ) specifies region size 2^N+1 */ + size_data = ((size_order - 1) << MPU_RSR_SZ) | 1 << MPU_RSR_EN; + + dsb(); /* Ensure all previous data accesses occur with old mappings */ + rgnr_write(number); + isb(); + drbar_write(start); + dracr_write(properties); + isb(); /* Propagate properties before enabling region */ + drsr_write(size_data); + + /* Check for independent I-side registers */ + if (mpu_iside_independent()) { + irbar_write(start); + iracr_write(properties); + isb(); + irsr_write(size_data); + } + isb(); + + /* Store region info (we treat i/d side the same, so only store d) */ + mpu_rgn_info.rgns[number].dracr = properties; + mpu_rgn_info.rgns[number].drbar = start; + mpu_rgn_info.rgns[number].drsr = size_data; + return 0; +} + +/* +* Set up default MPU regions, doing nothing if there is no MPU +*/ +void __init mpu_setup(void) +{ + int region_err; + if (!mpu_present()) + return; + + region_err = mpu_setup_region(MPU_RAM_REGION, PHYS_OFFSET, + ilog2(meminfo.bank[0].size), + MPU_AP_PL1RW_PL0RW | MPU_RGN_NORMAL); + if (region_err) { + panic("MPU region initialization failure! %d", region_err); + } else { + pr_info("Using ARMv7 PMSA Compliant MPU. " + "Region independence: %s, Max regions: %d\n", + mpu_iside_independent() ? "Yes" : "No", + mpu_max_regions()); + } +} +#else +static void sanity_check_meminfo_mpu(void) {} +static void __init mpu_setup(void) {} +#endif /* CONFIG_ARM_MPU */ + void __init arm_mm_memblock_reserve(void) { +#ifndef CONFIG_CPU_V7M /* * Register the exception vector page. * some architectures which the DRAM is the exception vector to trap, * alloc_page breaks with error, although it is not NULL, but "0." */ memblock_reserve(CONFIG_VECTORS_BASE, PAGE_SIZE); +#else /* ifndef CONFIG_CPU_V7M */ + /* + * There is no dedicated vector page on V7-M. So nothing needs to be + * reserved here. + */ +#endif } void __init sanity_check_meminfo(void) { - phys_addr_t end = bank_phys_end(&meminfo.bank[meminfo.nr_banks - 1]); + phys_addr_t end; + sanity_check_meminfo_mpu(); + end = bank_phys_end(&meminfo.bank[meminfo.nr_banks - 1]); high_memory = __va(end - 1) + 1; } @@ -41,6 +302,7 @@ void __init sanity_check_meminfo(void) void __init paging_init(struct machine_desc *mdesc) { early_trap_init((void *)CONFIG_VECTORS_BASE); + mpu_setup(); bootmem_init(); } diff --git a/arch/arm/mm/proc-v6.S b/arch/arm/mm/proc-v6.S index 919405e20b80..2d1ef87328a1 100644 --- a/arch/arm/mm/proc-v6.S +++ b/arch/arm/mm/proc-v6.S @@ -140,8 +140,10 @@ ENTRY(cpu_v6_set_pte_ext) ENTRY(cpu_v6_do_suspend) stmfd sp!, {r4 - r9, lr} mrc p15, 0, r4, c13, c0, 0 @ FCSE/PID +#ifdef CONFIG_MMU mrc p15, 0, r5, c3, c0, 0 @ Domain ID mrc p15, 0, r6, c2, c0, 1 @ Translation table base 1 +#endif mrc p15, 0, r7, c1, c0, 1 @ auxiliary control register mrc p15, 0, r8, c1, c0, 2 @ co-processor access control mrc p15, 0, r9, c1, c0, 0 @ control register @@ -158,14 +160,16 @@ ENTRY(cpu_v6_do_resume) mcr p15, 0, ip, c13, c0, 1 @ set reserved context ID ldmia r0, {r4 - r9} mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID +#ifdef CONFIG_MMU mcr p15, 0, r5, c3, c0, 0 @ Domain ID ALT_SMP(orr r1, r1, #TTB_FLAGS_SMP) ALT_UP(orr r1, r1, #TTB_FLAGS_UP) mcr p15, 0, r1, c2, c0, 0 @ Translation table base 0 mcr p15, 0, r6, c2, c0, 1 @ Translation table base 1 + mcr p15, 0, ip, c2, c0, 2 @ TTB control register +#endif mcr p15, 0, r7, c1, c0, 1 @ auxiliary control register mcr p15, 0, r8, c1, c0, 2 @ co-processor access control - mcr p15, 0, ip, c2, c0, 2 @ TTB control register mcr p15, 0, ip, c7, c5, 4 @ ISB mov r0, r9 @ control register b cpu_resume_mmu diff --git a/arch/arm/mm/proc-v7-3level.S b/arch/arm/mm/proc-v7-3level.S index 363027e811d6..5ffe1956c6d9 100644 --- a/arch/arm/mm/proc-v7-3level.S +++ b/arch/arm/mm/proc-v7-3level.S @@ -39,6 +39,14 @@ #define TTB_FLAGS_SMP (TTB_IRGN_WBWA|TTB_S|TTB_RGN_OC_WBWA) #define PMD_FLAGS_SMP (PMD_SECT_WBWA|PMD_SECT_S) +#ifndef __ARMEB__ +# define rpgdl r0 +# define rpgdh r1 +#else +# define rpgdl r1 +# define rpgdh r0 +#endif + /* * cpu_v7_switch_mm(pgd_phys, tsk) * @@ -47,10 +55,10 @@ */ ENTRY(cpu_v7_switch_mm) #ifdef CONFIG_MMU - mmid r1, r1 @ get mm->context.id - asid r3, r1 - mov r3, r3, lsl #(48 - 32) @ ASID - mcrr p15, 0, r0, r3, c2 @ set TTB 0 + mmid r2, r2 + asid r2, r2 + orr rpgdh, rpgdh, r2, lsl #(48 - 32) @ upper 32-bits of pgd + mcrr p15, 0, rpgdl, rpgdh, c2 @ set TTB 0 isb #endif mov pc, lr @@ -106,7 +114,8 @@ ENDPROC(cpu_v7_set_pte_ext) */ .macro v7_ttb_setup, zero, ttbr0, ttbr1, tmp ldr \tmp, =swapper_pg_dir @ swapper_pg_dir virtual address - cmp \ttbr1, \tmp @ PHYS_OFFSET > PAGE_OFFSET? (branch below) + mov \tmp, \tmp, lsr #ARCH_PGD_SHIFT + cmp \ttbr1, \tmp @ PHYS_OFFSET > PAGE_OFFSET? mrc p15, 0, \tmp, c2, c0, 2 @ TTB control register orr \tmp, \tmp, #TTB_EAE ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP) @@ -114,27 +123,21 @@ ENDPROC(cpu_v7_set_pte_ext) ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP << 16) ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP << 16) /* - * TTBR0/TTBR1 split (PAGE_OFFSET): - * 0x40000000: T0SZ = 2, T1SZ = 0 (not used) - * 0x80000000: T0SZ = 0, T1SZ = 1 - * 0xc0000000: T0SZ = 0, T1SZ = 2 - * - * Only use this feature if PHYS_OFFSET <= PAGE_OFFSET, otherwise - * booting secondary CPUs would end up using TTBR1 for the identity - * mapping set up in TTBR0. + * Only use split TTBRs if PHYS_OFFSET <= PAGE_OFFSET (cmp above), + * otherwise booting secondary CPUs would end up using TTBR1 for the + * identity mapping set up in TTBR0. */ - bhi 9001f @ PHYS_OFFSET > PAGE_OFFSET? - orr \tmp, \tmp, #(((PAGE_OFFSET >> 30) - 1) << 16) @ TTBCR.T1SZ -#if defined CONFIG_VMSPLIT_2G - /* PAGE_OFFSET == 0x80000000, T1SZ == 1 */ - add \ttbr1, \ttbr1, #1 << 4 @ skip two L1 entries -#elif defined CONFIG_VMSPLIT_3G - /* PAGE_OFFSET == 0xc0000000, T1SZ == 2 */ - add \ttbr1, \ttbr1, #4096 * (1 + 3) @ only L2 used, skip pgd+3*pmd -#endif - /* CONFIG_VMSPLIT_1G does not need TTBR1 adjustment */ -9001: mcr p15, 0, \tmp, c2, c0, 2 @ TTB control register - mcrr p15, 1, \ttbr1, \zero, c2 @ load TTBR1 + orrls \tmp, \tmp, #TTBR1_SIZE @ TTBCR.T1SZ + mcr p15, 0, \tmp, c2, c0, 2 @ TTBCR + mov \tmp, \ttbr1, lsr #(32 - ARCH_PGD_SHIFT) @ upper bits + mov \ttbr1, \ttbr1, lsl #ARCH_PGD_SHIFT @ lower bits + addls \ttbr1, \ttbr1, #TTBR1_OFFSET + mcrr p15, 1, \ttbr1, \zero, c2 @ load TTBR1 + mov \tmp, \ttbr0, lsr #(32 - ARCH_PGD_SHIFT) @ upper bits + mov \ttbr0, \ttbr0, lsl #ARCH_PGD_SHIFT @ lower bits + mcrr p15, 0, \ttbr0, \zero, c2 @ load TTBR0 + mcrr p15, 1, \ttbr1, \zero, c2 @ load TTBR1 + mcrr p15, 0, \ttbr0, \zero, c2 @ load TTBR0 .endm __CPUINIT diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index 2c73a7301ff7..f85ae8cad17f 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -98,9 +98,11 @@ ENTRY(cpu_v7_do_suspend) mrc p15, 0, r4, c13, c0, 0 @ FCSE/PID mrc p15, 0, r5, c13, c0, 3 @ User r/o thread ID stmia r0!, {r4 - r5} +#ifdef CONFIG_MMU mrc p15, 0, r6, c3, c0, 0 @ Domain ID mrc p15, 0, r7, c2, c0, 1 @ TTB 1 mrc p15, 0, r11, c2, c0, 2 @ TTB control register +#endif mrc p15, 0, r8, c1, c0, 0 @ Control register mrc p15, 0, r9, c1, c0, 1 @ Auxiliary control register mrc p15, 0, r10, c1, c0, 2 @ Co-processor access control @@ -110,13 +112,14 @@ ENDPROC(cpu_v7_do_suspend) ENTRY(cpu_v7_do_resume) mov ip, #0 - mcr p15, 0, ip, c8, c7, 0 @ invalidate TLBs mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache mcr p15, 0, ip, c13, c0, 1 @ set reserved context ID ldmia r0!, {r4 - r5} mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID mcr p15, 0, r5, c13, c0, 3 @ User r/o thread ID ldmia r0, {r6 - r11} +#ifdef CONFIG_MMU + mcr p15, 0, ip, c8, c7, 0 @ invalidate TLBs mcr p15, 0, r6, c3, c0, 0 @ Domain ID #ifndef CONFIG_ARM_LPAE ALT_SMP(orr r1, r1, #TTB_FLAGS_SMP) @@ -125,14 +128,15 @@ ENTRY(cpu_v7_do_resume) mcr p15, 0, r1, c2, c0, 0 @ TTB 0 mcr p15, 0, r7, c2, c0, 1 @ TTB 1 mcr p15, 0, r11, c2, c0, 2 @ TTB control register - mrc p15, 0, r4, c1, c0, 1 @ Read Auxiliary control register - teq r4, r9 @ Is it already set? - mcrne p15, 0, r9, c1, c0, 1 @ No, so write it - mcr p15, 0, r10, c1, c0, 2 @ Co-processor access control ldr r4, =PRRR @ PRRR ldr r5, =NMRR @ NMRR mcr p15, 0, r4, c10, c2, 0 @ write PRRR mcr p15, 0, r5, c10, c2, 1 @ write NMRR +#endif /* CONFIG_MMU */ + mrc p15, 0, r4, c1, c0, 1 @ Read Auxiliary control register + teq r4, r9 @ Is it already set? + mcrne p15, 0, r9, c1, c0, 1 @ No, so write it + mcr p15, 0, r10, c1, c0, 2 @ Co-processor access control isb dsb mov r0, r8 @ control register @@ -155,7 +159,8 @@ ENDPROC(cpu_v7_do_resume) */ __v7_ca5mp_setup: __v7_ca9mp_setup: - mov r10, #(1 << 0) @ TLB ops broadcasting +__v7_cr7mp_setup: + mov r10, #(1 << 0) @ Cache/TLB ops broadcasting b 1f __v7_ca7mp_setup: __v7_ca15mp_setup: @@ -415,6 +420,16 @@ __v7_pj4b_proc_info: .size __v7_pj4b_proc_info, . - __v7_pj4b_proc_info /* + * ARM Ltd. Cortex R7 processor. + */ + .type __v7_cr7mp_proc_info, #object +__v7_cr7mp_proc_info: + .long 0x410fc170 + .long 0xff0ffff0 + __v7_proc __v7_cr7mp_setup + .size __v7_cr7mp_proc_info, . - __v7_cr7mp_proc_info + + /* * ARM Ltd. Cortex A7 processor. */ .type __v7_ca7mp_proc_info, #object diff --git a/arch/arm/mm/proc-v7m.S b/arch/arm/mm/proc-v7m.S new file mode 100644 index 000000000000..0c93588fcb91 --- /dev/null +++ b/arch/arm/mm/proc-v7m.S @@ -0,0 +1,157 @@ +/* + * linux/arch/arm/mm/proc-v7m.S + * + * Copyright (C) 2008 ARM Ltd. + * Copyright (C) 2001 Deep Blue Solutions Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This is the "shell" of the ARMv7-M processor support. + */ +#include <linux/linkage.h> +#include <asm/assembler.h> +#include <asm/v7m.h> +#include "proc-macros.S" + +ENTRY(cpu_v7m_proc_init) + mov pc, lr +ENDPROC(cpu_v7m_proc_init) + +ENTRY(cpu_v7m_proc_fin) + mov pc, lr +ENDPROC(cpu_v7m_proc_fin) + +/* + * cpu_v7m_reset(loc) + * + * Perform a soft reset of the system. Put the CPU into the + * same state as it would be if it had been reset, and branch + * to what would be the reset vector. + * + * - loc - location to jump to for soft reset + */ + .align 5 +ENTRY(cpu_v7m_reset) + mov pc, r0 +ENDPROC(cpu_v7m_reset) + +/* + * cpu_v7m_do_idle() + * + * Idle the processor (eg, wait for interrupt). + * + * IRQs are already disabled. + */ +ENTRY(cpu_v7m_do_idle) + wfi + mov pc, lr +ENDPROC(cpu_v7m_do_idle) + +ENTRY(cpu_v7m_dcache_clean_area) + mov pc, lr +ENDPROC(cpu_v7m_dcache_clean_area) + +/* + * There is no MMU, so here is nothing to do. + */ +ENTRY(cpu_v7m_switch_mm) + mov pc, lr +ENDPROC(cpu_v7m_switch_mm) + +.globl cpu_v7m_suspend_size +.equ cpu_v7m_suspend_size, 0 + +#ifdef CONFIG_ARM_CPU_SUSPEND +ENTRY(cpu_v7m_do_suspend) + mov pc, lr +ENDPROC(cpu_v7m_do_suspend) + +ENTRY(cpu_v7m_do_resume) + mov pc, lr +ENDPROC(cpu_v7m_do_resume) +#endif + + .section ".text.init", #alloc, #execinstr + +/* + * __v7m_setup + * + * This should be able to cover all ARMv7-M cores. + */ +__v7m_setup: + @ Configure the vector table base address + ldr r0, =BASEADDR_V7M_SCB + ldr r12, =vector_table + str r12, [r0, V7M_SCB_VTOR] + + @ enable UsageFault, BusFault and MemManage fault. + ldr r5, [r0, #V7M_SCB_SHCSR] + orr r5, #(V7M_SCB_SHCSR_USGFAULTENA | V7M_SCB_SHCSR_BUSFAULTENA | V7M_SCB_SHCSR_MEMFAULTENA) + str r5, [r0, #V7M_SCB_SHCSR] + + @ Lower the priority of the SVC and PendSV exceptions + mov r5, #0x80000000 + str r5, [r0, V7M_SCB_SHPR2] @ set SVC priority + mov r5, #0x00800000 + str r5, [r0, V7M_SCB_SHPR3] @ set PendSV priority + + @ SVC to run the kernel in this mode + adr r1, BSYM(1f) + ldr r5, [r12, #11 * 4] @ read the SVC vector entry + str r1, [r12, #11 * 4] @ write the temporary SVC vector entry + mov r6, lr @ save LR + mov r7, sp @ save SP + ldr sp, =__v7m_setup_stack_top + cpsie i + svc #0 +1: cpsid i + str r5, [r12, #11 * 4] @ restore the original SVC vector entry + mov lr, r6 @ restore LR + mov sp, r7 @ restore SP + + @ Special-purpose control register + mov r1, #1 + msr control, r1 @ Thread mode has unpriviledged access + + @ Configure the System Control Register to ensure 8-byte stack alignment + @ Note the STKALIGN bit is either RW or RAO. + ldr r12, [r0, V7M_SCB_CCR] @ system control register + orr r12, #V7M_SCB_CCR_STKALIGN + str r12, [r0, V7M_SCB_CCR] + mov pc, lr +ENDPROC(__v7m_setup) + + define_processor_functions v7m, dabort=nommu_early_abort, pabort=legacy_pabort, nommu=1 + + .section ".rodata" + string cpu_arch_name, "armv7m" + string cpu_elf_name "v7m" + string cpu_v7m_name "ARMv7-M" + + .section ".proc.info.init", #alloc, #execinstr + + /* + * Match any ARMv7-M processor core. + */ + .type __v7m_proc_info, #object +__v7m_proc_info: + .long 0x000f0000 @ Required ID value + .long 0x000f0000 @ Mask for ID + .long 0 @ proc_info_list.__cpu_mm_mmu_flags + .long 0 @ proc_info_list.__cpu_io_mmu_flags + b __v7m_setup @ proc_info_list.__cpu_flush + .long cpu_arch_name + .long cpu_elf_name + .long HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT + .long cpu_v7m_name + .long v7m_processor_functions @ proc_info_list.proc + .long 0 @ proc_info_list.tlb + .long 0 @ proc_info_list.user + .long nop_cache_fns @ proc_info_list.cache + .size __v7m_proc_info, . - __v7m_proc_info + +__v7m_setup_stack: + .space 4 * 8 @ 8 registers +__v7m_setup_stack_top: |
