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-rw-r--r--arch/arm/cpu/armv8/cache_v8.c77
-rw-r--r--arch/arm/cpu/armv8/start.S36
-rw-r--r--arch/arm/include/asm/armv8/mmu.h82
-rw-r--r--arch/arm/include/asm/global_data.h3
-rw-r--r--arch/arm/include/asm/system.h7
-rw-r--r--doc/README.arm6435
6 files changed, 228 insertions, 12 deletions
diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c
index 53bac3b449..71f0020c7f 100644
--- a/arch/arm/cpu/armv8/cache_v8.c
+++ b/arch/arm/cpu/armv8/cache_v8.c
@@ -12,6 +12,69 @@
DECLARE_GLOBAL_DATA_PTR;
#ifndef CONFIG_SYS_DCACHE_OFF
+
+#ifdef CONFIG_SYS_FULL_VA
+static void set_ptl1_entry(u64 index, u64 ptl2_entry)
+{
+ u64 *pgd = (u64 *)gd->arch.tlb_addr;
+ u64 value;
+
+ value = ptl2_entry | PTL1_TYPE_TABLE;
+ pgd[index] = value;
+}
+
+static void set_ptl2_block(u64 ptl1, u64 bfn, u64 address, u64 memory_attrs)
+{
+ u64 *pmd = (u64 *)ptl1;
+ u64 value;
+
+ value = address | PTL2_TYPE_BLOCK | PTL2_BLOCK_AF;
+ value |= memory_attrs;
+ pmd[bfn] = value;
+}
+
+static struct mm_region mem_map[] = CONFIG_SYS_MEM_MAP;
+
+#define PTL1_ENTRIES CONFIG_SYS_PTL1_ENTRIES
+#define PTL2_ENTRIES CONFIG_SYS_PTL2_ENTRIES
+
+static void setup_pgtables(void)
+{
+ int l1_e, l2_e;
+ unsigned long pmd = 0;
+ unsigned long address;
+
+ /* Setup the PMD pointers */
+ for (l1_e = 0; l1_e < CONFIG_SYS_MEM_MAP_SIZE; l1_e++) {
+ gd->arch.pmd_addr[l1_e] = gd->arch.tlb_addr +
+ PTL1_ENTRIES * sizeof(u64);
+ gd->arch.pmd_addr[l1_e] += PTL2_ENTRIES * sizeof(u64) * l1_e;
+ gd->arch.pmd_addr[l1_e] = ALIGN(gd->arch.pmd_addr[l1_e],
+ 0x10000UL);
+ }
+
+ /* Setup the page tables */
+ for (l1_e = 0; l1_e < PTL1_ENTRIES; l1_e++) {
+ if (mem_map[pmd].base ==
+ (uintptr_t)l1_e << PTL2_BITS) {
+ set_ptl1_entry(l1_e, gd->arch.pmd_addr[pmd]);
+
+ for (l2_e = 0; l2_e < PTL2_ENTRIES; l2_e++) {
+ address = mem_map[pmd].base
+ + (uintptr_t)l2_e * BLOCK_SIZE;
+ set_ptl2_block(gd->arch.pmd_addr[pmd], l2_e,
+ address, mem_map[pmd].attrs);
+ }
+
+ pmd++;
+ } else {
+ set_ptl1_entry(l1_e, 0);
+ }
+ }
+}
+
+#else
+
inline void set_pgtable_section(u64 *page_table, u64 index, u64 section,
u64 memory_type, u64 attribute)
{
@@ -30,14 +93,24 @@ inline void set_pgtable_table(u64 *page_table, u64 index, u64 *table_addr)
value = (u64)table_addr | PMD_TYPE_TABLE;
page_table[index] = value;
}
+#endif
/* to activate the MMU we need to set up virtual memory */
__weak void mmu_setup(void)
{
+#ifndef CONFIG_SYS_FULL_VA
bd_t *bd = gd->bd;
u64 *page_table = (u64 *)gd->arch.tlb_addr, i, j;
+#endif
int el;
+#ifdef CONFIG_SYS_FULL_VA
+ unsigned long coreid = read_mpidr() & CONFIG_COREID_MASK;
+
+ /* Set up page tables only on BSP */
+ if (coreid == BSP_COREID)
+ setup_pgtables();
+#else
/* Setup an identity-mapping for all spaces */
for (i = 0; i < (PGTABLE_SIZE >> 3); i++) {
set_pgtable_section(page_table, i, i << SECTION_SHIFT,
@@ -55,6 +128,7 @@ __weak void mmu_setup(void)
}
}
+#endif
/* load TTBR0 */
el = current_el();
if (el == 1) {
@@ -154,6 +228,7 @@ u64 *__weak arch_get_page_table(void) {
return NULL;
}
+#ifndef CONFIG_SYS_FULL_VA
void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size,
enum dcache_option option)
{
@@ -179,6 +254,8 @@ void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size,
flush_dcache_range(start, end);
asm volatile("dsb sy");
}
+#endif
+
#else /* CONFIG_SYS_DCACHE_OFF */
void invalidate_dcache_all(void)
diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S
index da45d984d0..2ee60d60f1 100644
--- a/arch/arm/cpu/armv8/start.S
+++ b/arch/arm/cpu/armv8/start.S
@@ -43,6 +43,9 @@ _bss_end_ofs:
.quad __bss_end - _start
reset:
+#ifdef CONFIG_SYS_RESET_SCTRL
+ bl reset_sctrl
+#endif
/*
* Could be EL3/EL2/EL1, Initial State:
* Little Endian, MMU Disabled, i/dCache Disabled
@@ -99,6 +102,39 @@ master_cpu:
bl _main
+#ifdef CONFIG_SYS_RESET_SCTRL
+reset_sctrl:
+ switch_el x1, 3f, 2f, 1f
+3:
+ mrs x0, sctlr_el3
+ b 0f
+2:
+ mrs x0, sctlr_el2
+ b 0f
+1:
+ mrs x0, sctlr_el1
+
+0:
+ ldr x1, =0xfdfffffa
+ and x0, x0, x1
+
+ switch_el x1, 6f, 5f, 4f
+6:
+ msr sctlr_el3, x0
+ b 7f
+5:
+ msr sctlr_el2, x0
+ b 7f
+4:
+ msr sctlr_el1, x0
+
+7:
+ dsb sy
+ isb
+ b __asm_invalidate_tlb_all
+ ret
+#endif
+
/*-----------------------------------------------------------------------*/
WEAK(apply_core_errata)
diff --git a/arch/arm/include/asm/armv8/mmu.h b/arch/arm/include/asm/armv8/mmu.h
index 2e2a3a8226..897f010207 100644
--- a/arch/arm/include/asm/armv8/mmu.h
+++ b/arch/arm/include/asm/armv8/mmu.h
@@ -21,7 +21,13 @@
* The following definitions are related each other, shoud be
* calculated specifically.
*/
+
+#ifndef CONFIG_SYS_FULL_VA
#define VA_BITS (42) /* 42 bits virtual address */
+#else
+#define VA_BITS CONFIG_SYS_VA_BITS
+#define PTL2_BITS CONFIG_SYS_PTL2_BITS
+#endif
/* PAGE_SHIFT determines the page size */
#undef PAGE_SIZE
@@ -30,11 +36,18 @@
#define PAGE_MASK (~(PAGE_SIZE-1))
/*
- * section address mask and size definitions.
+ * block/section address mask and size definitions.
*/
+#ifndef CONFIG_SYS_FULL_VA
#define SECTION_SHIFT 29
#define SECTION_SIZE (UL(1) << SECTION_SHIFT)
#define SECTION_MASK (~(SECTION_SIZE-1))
+#else
+#define BLOCK_SHIFT CONFIG_SYS_BLOCK_SHIFT
+#define BLOCK_SIZE (UL(1) << BLOCK_SHIFT)
+#define BLOCK_MASK (~(BLOCK_SIZE-1))
+#endif
+
/***************************************************************/
/*
@@ -46,15 +59,54 @@
#define MT_NORMAL_NC 3
#define MT_NORMAL 4
-#define MEMORY_ATTRIBUTES ((0x00 << (MT_DEVICE_NGNRNE*8)) | \
- (0x04 << (MT_DEVICE_NGNRE*8)) | \
- (0x0c << (MT_DEVICE_GRE*8)) | \
- (0x44 << (MT_NORMAL_NC*8)) | \
- (UL(0xff) << (MT_NORMAL*8)))
+#define MEMORY_ATTRIBUTES ((0x00 << (MT_DEVICE_NGNRNE * 8)) | \
+ (0x04 << (MT_DEVICE_NGNRE * 8)) | \
+ (0x0c << (MT_DEVICE_GRE * 8)) | \
+ (0x44 << (MT_NORMAL_NC * 8)) | \
+ (UL(0xff) << (MT_NORMAL * 8)))
/*
* Hardware page table definitions.
*
+ */
+
+#ifdef CONFIG_SYS_FULL_VA
+/*
+ * Level 1 descriptor (PGD).
+ */
+
+#define PTL1_TYPE_MASK (3 << 0)
+#define PTL1_TYPE_TABLE (3 << 0)
+
+#define PTL1_TABLE_PXN (1UL << 59)
+#define PTL1_TABLE_XN (1UL << 60)
+#define PTL1_TABLE_AP (1UL << 61)
+#define PTL1_TABLE_NS (1UL << 63)
+
+
+/*
+ * Level 2 descriptor (PMD).
+ */
+
+#define PTL2_TYPE_MASK (3 << 0)
+#define PTL2_TYPE_FAULT (0 << 0)
+#define PTL2_TYPE_TABLE (3 << 0)
+#define PTL2_TYPE_BLOCK (1 << 0)
+
+/*
+ * Block
+ */
+#define PTL2_MEMTYPE(x) ((x) << 2)
+#define PTL2_BLOCK_NON_SHARE (0 << 8)
+#define PTL2_BLOCK_OUTER_SHARE (2 << 8)
+#define PTL2_BLOCK_INNER_SHARE (3 << 8)
+#define PTL2_BLOCK_AF (1 << 10)
+#define PTL2_BLOCK_NG (1 << 11)
+#define PTL2_BLOCK_PXN (UL(1) << 53)
+#define PTL2_BLOCK_UXN (UL(1) << 54)
+
+#else
+/*
* Level 2 descriptor (PMD).
*/
#define PMD_TYPE_MASK (3 << 0)
@@ -74,6 +126,8 @@
#define PMD_SECT_PXN (UL(1) << 53)
#define PMD_SECT_UXN (UL(1) << 54)
+#endif
+
/*
* AttrIndx[2:0]
*/
@@ -100,9 +154,16 @@
#define TCR_TG0_4K (0 << 14)
#define TCR_TG0_64K (1 << 14)
#define TCR_TG0_16K (2 << 14)
+
+#ifndef CONFIG_SYS_FULL_VA
#define TCR_EL1_IPS_BITS (UL(3) << 32) /* 42 bits physical address */
#define TCR_EL2_IPS_BITS (3 << 16) /* 42 bits physical address */
#define TCR_EL3_IPS_BITS (3 << 16) /* 42 bits physical address */
+#else
+#define TCR_EL1_IPS_BITS CONFIG_SYS_TCR_EL1_IPS_BITS
+#define TCR_EL2_IPS_BITS CONFIG_SYS_TCR_EL2_IPS_BITS
+#define TCR_EL3_IPS_BITS CONFIG_SYS_TCR_EL3_IPS_BITS
+#endif
/* PTWs cacheable, inner/outer WBWA and inner shareable */
#define TCR_FLAGS (TCR_TG0_64K | \
@@ -116,6 +177,7 @@
#define TCR_EL3_RSVD (1 << 31 | 1 << 23)
#ifndef __ASSEMBLY__
+#ifndef CONFIG_SYS_FULL_VA
void set_pgtable_section(u64 *page_table, u64 index,
u64 section, u64 memory_type,
@@ -123,6 +185,7 @@ void set_pgtable_section(u64 *page_table, u64 index,
void set_pgtable_table(u64 *page_table, u64 index,
u64 *table_addr);
+#endif
static inline void set_ttbr_tcr_mair(int el, u64 table, u64 tcr, u64 attr)
{
asm volatile("dsb sy");
@@ -143,5 +206,12 @@ static inline void set_ttbr_tcr_mair(int el, u64 table, u64 tcr, u64 attr)
}
asm volatile("isb");
}
+
+struct mm_region {
+ u64 base;
+ u64 size;
+ u64 attrs;
+};
#endif
+
#endif /* _ASM_ARMV8_MMU_H_ */
diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h
index bd27281e79..dcfa0985b5 100644
--- a/arch/arm/include/asm/global_data.h
+++ b/arch/arm/include/asm/global_data.h
@@ -38,6 +38,9 @@ struct arch_global_data {
unsigned long long timer_reset_value;
#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
unsigned long tlb_addr;
+#if defined(CONFIG_SYS_FULL_VA)
+ unsigned long pmd_addr[CONFIG_SYS_PTL1_ENTRIES];
+#endif
unsigned long tlb_size;
#endif
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 5d66fa00b6..393e7afcdd 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -14,7 +14,12 @@
#define CR_WXN (1 << 19) /* Write Permision Imply XN */
#define CR_EE (1 << 25) /* Exception (Big) Endian */
+#ifndef CONFIG_SYS_FULL_VA
#define PGTABLE_SIZE (0x10000)
+#else
+#define PGTABLE_SIZE CONFIG_SYS_PGTABLE_SIZE
+#endif
+
/* 2MB granularity */
#define MMU_SECTION_SHIFT 21
#define MMU_SECTION_SIZE (1 << MMU_SECTION_SHIFT)
@@ -148,7 +153,9 @@ void flush_l3_cache(void);
#define CR_AFE (1 << 29) /* Access flag enable */
#define CR_TE (1 << 30) /* Thumb exception enable */
+#ifndef PGTABLE_SIZE
#define PGTABLE_SIZE (4096 * 4)
+#endif
/*
* This is used to ensure the compiler did actually allocate the register we
diff --git a/doc/README.arm64 b/doc/README.arm64
index 75586dbaa7..f32108feb7 100644
--- a/doc/README.arm64
+++ b/doc/README.arm64
@@ -36,11 +36,34 @@ Notes
6. CONFIG_ARM64 instead of CONFIG_ARMV8 is used to distinguish aarch64 and
aarch32 specific codes.
+7. CONFIG_SYS_FULL_VA is used to enable 2-level page tables. For cores
+ supporting 64k pages it allows usage of full 48+ virtual/physical addresses
+
+ Enabling this option requires the following ones to be defined:
+ - CONFIG_SYS_MEM_MAP - an array of 'struct mm_region' describing the
+ system memory map (start, length, attributes)
+ - CONFIG_SYS_MEM_MAP_SIZE - number of entries in CONFIG_SYS_MEM_MAP
+ - CONFIG_SYS_PTL1_ENTRIES - number of 1st level page table entries
+ - CONFIG_SYS_PTL2_ENTRIES - number of 1nd level page table entries
+ for the largest CONFIG_SYS_MEM_MAP entry
+ - CONFIG_COREID_MASK - the mask value used to get the core from the
+ MPIDR_EL1 register
+ - CONFIG_SYS_PTL2_BITS - number of bits addressed by the 2nd level
+ page tables
+ - CONFIG_SYS_BLOCK_SHIFT - number of bits addressed by a single block
+ entry from L2 page tables
+ - CONFIG_SYS_PGTABLE_SIZE - total size of the page table
+ - CONFIG_SYS_TCR_EL{1,2,3}_IPS_BITS - the IPS field of the TCR_EL{1,2,3}
+
+
+
+
Contributor
===========
- Tom Rini <trini@ti.com>
- Scott Wood <scottwood@freescale.com>
- York Sun <yorksun@freescale.com>
- Simon Glass <sjg@chromium.org>
- Sharma Bhupesh <bhupesh.sharma@freescale.com>
- Rob Herring <robherring2@gmail.com>
+ Tom Rini <trini@ti.com>
+ Scott Wood <scottwood@freescale.com>
+ York Sun <yorksun@freescale.com>
+ Simon Glass <sjg@chromium.org>
+ Sharma Bhupesh <bhupesh.sharma@freescale.com>
+ Rob Herring <robherring2@gmail.com>
+ Sergey Temerkhanov <s.temerkhanov@gmail.com>
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