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/*
* fixmap.h: compile-time virtual memory allocation
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1998 Ingo Molnar
*
* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
* x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009
*/
#ifndef _ASM_X86_FIXMAP_H
#define _ASM_X86_FIXMAP_H
#ifndef __ASSEMBLY__
#include <linux/kernel.h>
#include <asm/acpi.h>
#include <asm/apicdef.h>
#include <asm/page.h>
#ifdef CONFIG_X86_32
#include <linux/threads.h>
#include <asm/kmap_types.h>
#else
#include <uapi/asm/vsyscall.h>
#endif
/*
* We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
* uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
* Because of this, FIXADDR_TOP x86 integration was left as later work.
*/
#ifdef CONFIG_X86_32
/* used by vmalloc.c, vsyscall.lds.S.
*
* Leave one empty page between vmalloc'ed areas and
* the start of the fixmap.
*/
extern unsigned long __FIXADDR_TOP;
#define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
#else
#define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
PAGE_SIZE)
#endif
/*
* cpu_entry_area is a percpu region in the fixmap that contains things
* needed by the CPU and early entry/exit code. Real types aren't used
* for all fields here to avoid circular header dependencies.
*
* Every field is a virtual alias of some other allocated backing store.
* There is no direct allocation of a struct cpu_entry_area.
*/
struct cpu_entry_area {
char gdt[PAGE_SIZE];
/*
* The GDT is just below entry_stack and thus serves (on x86_64) as
* a a read-only guard page.
*/
struct entry_stack_page entry_stack_page;
/*
* On x86_64, the TSS is mapped RO. On x86_32, it's mapped RW because
* we need task switches to work, and task switches write to the TSS.
*/
struct tss_struct tss;
char entry_trampoline[PAGE_SIZE];
#ifdef CONFIG_X86_64
/*
* Exception stacks used for IST entries.
*
* In the future, this should have a separate slot for each stack
* with guard pages between them.
*/
char exception_stacks[(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ + DEBUG_STKSZ];
#endif
};
#define CPU_ENTRY_AREA_PAGES (sizeof(struct cpu_entry_area) / PAGE_SIZE)
extern void setup_cpu_entry_areas(void);
/*
* Here we define all the compile-time 'special' virtual
* addresses. The point is to have a constant address at
* compile time, but to set the physical address only
* in the boot process.
* for x86_32: We allocate these special addresses
* from the end of virtual memory (0xfffff000) backwards.
* Also this lets us do fail-safe vmalloc(), we
* can guarantee that these special addresses and
* vmalloc()-ed addresses never overlap.
*
* These 'compile-time allocated' memory buffers are
* fixed-size 4k pages (or larger if used with an increment
* higher than 1). Use set_fixmap(idx,phys) to associate
* physical memory with fixmap indices.
*
* TLB entries of such buffers will not be flushed across
* task switches.
*/
enum fixed_addresses {
#ifdef CONFIG_X86_32
FIX_HOLE,
#else
#ifdef CONFIG_X86_VSYSCALL_EMULATION
VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
#endif
#endif
FIX_DBGP_BASE,
FIX_EARLYCON_MEM_BASE,
#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
FIX_OHCI1394_BASE,
#endif
#ifdef CONFIG_X86_LOCAL_APIC
FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
#endif
#ifdef CONFIG_X86_IO_APIC
FIX_IO_APIC_BASE_0,
FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
#endif
FIX_RO_IDT, /* Virtual mapping for read-only IDT */
#ifdef CONFIG_X86_32
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
#ifdef CONFIG_PCI_MMCONFIG
FIX_PCIE_MCFG,
#endif
#endif
#ifdef CONFIG_PARAVIRT
FIX_PARAVIRT_BOOTMAP,
#endif
FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */
FIX_TEXT_POKE0, /* first page is last, because allocation is backward */
#ifdef CONFIG_X86_INTEL_MID
FIX_LNW_VRTC,
#endif
/* Fixmap entries to remap the GDTs, one per processor. */
FIX_CPU_ENTRY_AREA_TOP,
FIX_CPU_ENTRY_AREA_BOTTOM = FIX_CPU_ENTRY_AREA_TOP + (CPU_ENTRY_AREA_PAGES * NR_CPUS) - 1,
#ifdef CONFIG_ACPI_APEI_GHES
/* Used for GHES mapping from assorted contexts */
FIX_APEI_GHES_IRQ,
FIX_APEI_GHES_NMI,
#endif
__end_of_permanent_fixed_addresses,
/*
* 512 temporary boot-time mappings, used by early_ioremap(),
* before ioremap() is functional.
*
* If necessary we round it up to the next 512 pages boundary so
* that we can have a single pgd entry and a single pte table:
*/
#define NR_FIX_BTMAPS 64
#define FIX_BTMAPS_SLOTS 8
#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
FIX_BTMAP_END =
(__end_of_permanent_fixed_addresses ^
(__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
-PTRS_PER_PTE
? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
(__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
: __end_of_permanent_fixed_addresses,
FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
#ifdef CONFIG_X86_32
FIX_WP_TEST,
#endif
#ifdef CONFIG_INTEL_TXT
FIX_TBOOT_BASE,
#endif
__end_of_fixed_addresses
};
extern void reserve_top_address(unsigned long reserve);
#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
extern int fixmaps_set;
extern pte_t *kmap_pte;
#define kmap_prot PAGE_KERNEL
extern pte_t *pkmap_page_table;
void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
void native_set_fixmap(enum fixed_addresses idx,
phys_addr_t phys, pgprot_t flags);
#ifndef CONFIG_PARAVIRT
static inline void __set_fixmap(enum fixed_addresses idx,
phys_addr_t phys, pgprot_t flags)
{
native_set_fixmap(idx, phys, flags);
}
#endif
/*
* FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not
* supported for MMIO addresses, so make sure that the memory encryption
* mask is not part of the page attributes.
*/
#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE
/*
* Early memremap routines used for in-place encryption. The mappings created
* by these routines are intended to be used as temporary mappings.
*/
void __init *early_memremap_encrypted(resource_size_t phys_addr,
unsigned long size);
void __init *early_memremap_encrypted_wp(resource_size_t phys_addr,
unsigned long size);
void __init *early_memremap_decrypted(resource_size_t phys_addr,
unsigned long size);
void __init *early_memremap_decrypted_wp(resource_size_t phys_addr,
unsigned long size);
#include <asm-generic/fixmap.h>
#define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
#define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
void __early_set_fixmap(enum fixed_addresses idx,
phys_addr_t phys, pgprot_t flags);
static inline unsigned int __get_cpu_entry_area_page_index(int cpu, int page)
{
BUILD_BUG_ON(sizeof(struct cpu_entry_area) % PAGE_SIZE != 0);
return FIX_CPU_ENTRY_AREA_BOTTOM - cpu*CPU_ENTRY_AREA_PAGES - page;
}
#define __get_cpu_entry_area_offset_index(cpu, offset) ({ \
BUILD_BUG_ON(offset % PAGE_SIZE != 0); \
__get_cpu_entry_area_page_index(cpu, offset / PAGE_SIZE); \
})
#define get_cpu_entry_area_index(cpu, field) \
__get_cpu_entry_area_offset_index((cpu), offsetof(struct cpu_entry_area, field))
static inline struct cpu_entry_area *get_cpu_entry_area(int cpu)
{
return (struct cpu_entry_area *)__fix_to_virt(__get_cpu_entry_area_page_index(cpu, 0));
}
static inline struct entry_stack *cpu_entry_stack(int cpu)
{
return &get_cpu_entry_area(cpu)->entry_stack_page.stack;
}
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_X86_FIXMAP_H */
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