diff options
Diffstat (limited to 'include/asm-x86/pgtable_64.h')
| -rw-r--r-- | include/asm-x86/pgtable_64.h | 432 |
1 files changed, 432 insertions, 0 deletions
diff --git a/include/asm-x86/pgtable_64.h b/include/asm-x86/pgtable_64.h new file mode 100644 index 00000000000..57dd6b3107e --- /dev/null +++ b/include/asm-x86/pgtable_64.h @@ -0,0 +1,432 @@ +#ifndef _X86_64_PGTABLE_H +#define _X86_64_PGTABLE_H + +#include <linux/const.h> +#ifndef __ASSEMBLY__ + +/* + * This file contains the functions and defines necessary to modify and use + * the x86-64 page table tree. + */ +#include <asm/processor.h> +#include <asm/bitops.h> +#include <linux/threads.h> +#include <asm/pda.h> + +extern pud_t level3_kernel_pgt[512]; +extern pud_t level3_ident_pgt[512]; +extern pmd_t level2_kernel_pgt[512]; +extern pgd_t init_level4_pgt[]; +extern unsigned long __supported_pte_mask; + +#define swapper_pg_dir init_level4_pgt + +extern void paging_init(void); +extern void clear_kernel_mapping(unsigned long addr, unsigned long size); + +/* + * ZERO_PAGE is a global shared page that is always zero: used + * for zero-mapped memory areas etc.. + */ +extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)]; +#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) + +#endif /* !__ASSEMBLY__ */ + +/* + * PGDIR_SHIFT determines what a top-level page table entry can map + */ +#define PGDIR_SHIFT 39 +#define PTRS_PER_PGD 512 + +/* + * 3rd level page + */ +#define PUD_SHIFT 30 +#define PTRS_PER_PUD 512 + +/* + * PMD_SHIFT determines the size of the area a middle-level + * page table can map + */ +#define PMD_SHIFT 21 +#define PTRS_PER_PMD 512 + +/* + * entries per page directory level + */ +#define PTRS_PER_PTE 512 + +#ifndef __ASSEMBLY__ + +#define pte_ERROR(e) \ + printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), pte_val(e)) +#define pmd_ERROR(e) \ + printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), pmd_val(e)) +#define pud_ERROR(e) \ + printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), pud_val(e)) +#define pgd_ERROR(e) \ + printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), pgd_val(e)) + +#define pgd_none(x) (!pgd_val(x)) +#define pud_none(x) (!pud_val(x)) + +static inline void set_pte(pte_t *dst, pte_t val) +{ + pte_val(*dst) = pte_val(val); +} +#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) + +static inline void set_pmd(pmd_t *dst, pmd_t val) +{ + pmd_val(*dst) = pmd_val(val); +} + +static inline void set_pud(pud_t *dst, pud_t val) +{ + pud_val(*dst) = pud_val(val); +} + +static inline void pud_clear (pud_t *pud) +{ + set_pud(pud, __pud(0)); +} + +static inline void set_pgd(pgd_t *dst, pgd_t val) +{ + pgd_val(*dst) = pgd_val(val); +} + +static inline void pgd_clear (pgd_t * pgd) +{ + set_pgd(pgd, __pgd(0)); +} + +#define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte, 0)) + +struct mm_struct; + +static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full) +{ + pte_t pte; + if (full) { + pte = *ptep; + *ptep = __pte(0); + } else { + pte = ptep_get_and_clear(mm, addr, ptep); + } + return pte; +} + +#define pte_same(a, b) ((a).pte == (b).pte) + +#define pte_pgprot(a) (__pgprot((a).pte & ~PHYSICAL_PAGE_MASK)) + +#endif /* !__ASSEMBLY__ */ + +#define PMD_SIZE (_AC(1,UL) << PMD_SHIFT) +#define PMD_MASK (~(PMD_SIZE-1)) +#define PUD_SIZE (_AC(1,UL) << PUD_SHIFT) +#define PUD_MASK (~(PUD_SIZE-1)) +#define PGDIR_SIZE (_AC(1,UL) << PGDIR_SHIFT) +#define PGDIR_MASK (~(PGDIR_SIZE-1)) + +#define USER_PTRS_PER_PGD ((TASK_SIZE-1)/PGDIR_SIZE+1) +#define FIRST_USER_ADDRESS 0 + +#define MAXMEM _AC(0x3fffffffffff, UL) +#define VMALLOC_START _AC(0xffffc20000000000, UL) +#define VMALLOC_END _AC(0xffffe1ffffffffff, UL) +#define MODULES_VADDR _AC(0xffffffff88000000, UL) +#define MODULES_END _AC(0xfffffffffff00000, UL) +#define MODULES_LEN (MODULES_END - MODULES_VADDR) + +#define _PAGE_BIT_PRESENT 0 +#define _PAGE_BIT_RW 1 +#define _PAGE_BIT_USER 2 +#define _PAGE_BIT_PWT 3 +#define _PAGE_BIT_PCD 4 +#define _PAGE_BIT_ACCESSED 5 +#define _PAGE_BIT_DIRTY 6 +#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */ +#define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */ +#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */ + +#define _PAGE_PRESENT 0x001 +#define _PAGE_RW 0x002 +#define _PAGE_USER 0x004 +#define _PAGE_PWT 0x008 +#define _PAGE_PCD 0x010 +#define _PAGE_ACCESSED 0x020 +#define _PAGE_DIRTY 0x040 +#define _PAGE_PSE 0x080 /* 2MB page */ +#define _PAGE_FILE 0x040 /* nonlinear file mapping, saved PTE; unset:swap */ +#define _PAGE_GLOBAL 0x100 /* Global TLB entry */ + +#define _PAGE_PROTNONE 0x080 /* If not present */ +#define _PAGE_NX (_AC(1,UL)<<_PAGE_BIT_NX) + +#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY) +#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY) + +#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) + +#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) +#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX) +#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED) +#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX) +#define PAGE_COPY PAGE_COPY_NOEXEC +#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) +#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX) +#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) +#define __PAGE_KERNEL \ + (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX) +#define __PAGE_KERNEL_EXEC \ + (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) +#define __PAGE_KERNEL_NOCACHE \ + (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_PCD | _PAGE_ACCESSED | _PAGE_NX) +#define __PAGE_KERNEL_RO \ + (_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX) +#define __PAGE_KERNEL_VSYSCALL \ + (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) +#define __PAGE_KERNEL_VSYSCALL_NOCACHE \ + (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_PCD) +#define __PAGE_KERNEL_LARGE \ + (__PAGE_KERNEL | _PAGE_PSE) +#define __PAGE_KERNEL_LARGE_EXEC \ + (__PAGE_KERNEL_EXEC | _PAGE_PSE) + +#define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL) + +#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL) +#define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC) +#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO) +#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE) +#define PAGE_KERNEL_VSYSCALL32 __pgprot(__PAGE_KERNEL_VSYSCALL) +#define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL) +#define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE) +#define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE) + +/* xwr */ +#define __P000 PAGE_NONE +#define __P001 PAGE_READONLY +#define __P010 PAGE_COPY +#define __P011 PAGE_COPY +#define __P100 PAGE_READONLY_EXEC +#define __P101 PAGE_READONLY_EXEC +#define __P110 PAGE_COPY_EXEC +#define __P111 PAGE_COPY_EXEC + +#define __S000 PAGE_NONE +#define __S001 PAGE_READONLY +#define __S010 PAGE_SHARED +#define __S011 PAGE_SHARED +#define __S100 PAGE_READONLY_EXEC +#define __S101 PAGE_READONLY_EXEC +#define __S110 PAGE_SHARED_EXEC +#define __S111 PAGE_SHARED_EXEC + +#ifndef __ASSEMBLY__ + +static inline unsigned long pgd_bad(pgd_t pgd) +{ + return pgd_val(pgd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER); +} + +static inline unsigned long pud_bad(pud_t pud) +{ + return pud_val(pud) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER); +} + +static inline unsigned long pmd_bad(pmd_t pmd) +{ + return pmd_val(pmd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER); +} + +#define pte_none(x) (!pte_val(x)) +#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE)) +#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0) + +#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) /* FIXME: is this + right? */ +#define pte_page(x) pfn_to_page(pte_pfn(x)) +#define pte_pfn(x) ((pte_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT) + +static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) +{ + pte_t pte; + pte_val(pte) = (page_nr << PAGE_SHIFT); + pte_val(pte) |= pgprot_val(pgprot); + pte_val(pte) &= __supported_pte_mask; + return pte; +} + +/* + * The following only work if pte_present() is true. + * Undefined behaviour if not.. + */ +#define __LARGE_PTE (_PAGE_PSE|_PAGE_PRESENT) +static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } +static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } +static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; } +static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } +static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_PSE; } + +static inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; } +static inline pte_t pte_mkold(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; } +static inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; } +static inline pte_t pte_mkexec(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_NX)); return pte; } +static inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; } +static inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; } +static inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; } +static inline pte_t pte_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_PSE)); return pte; } +static inline pte_t pte_clrhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_PSE)); return pte; } + +struct vm_area_struct; + +static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) +{ + if (!pte_young(*ptep)) + return 0; + return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte); +} + +static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) +{ + clear_bit(_PAGE_BIT_RW, &ptep->pte); +} + +/* + * Macro to mark a page protection value as "uncacheable". + */ +#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT)) + +static inline int pmd_large(pmd_t pte) { + return (pmd_val(pte) & __LARGE_PTE) == __LARGE_PTE; +} + + +/* + * Conversion functions: convert a page and protection to a page entry, + * and a page entry and page directory to the page they refer to. + */ + +/* + * Level 4 access. + */ +#define pgd_page_vaddr(pgd) ((unsigned long) __va((unsigned long)pgd_val(pgd) & PTE_MASK)) +#define pgd_page(pgd) (pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)) +#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) +#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr)) +#define pgd_offset_k(address) (init_level4_pgt + pgd_index(address)) +#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT) +#define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE }) + +/* PUD - Level3 access */ +/* to find an entry in a page-table-directory. */ +#define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK)) +#define pud_page(pud) (pfn_to_page(pud_val(pud) >> PAGE_SHIFT)) +#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1)) +#define pud_offset(pgd, address) ((pud_t *) pgd_page_vaddr(*(pgd)) + pud_index(address)) +#define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT) + +/* PMD - Level 2 access */ +#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK)) +#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)) + +#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) +#define pmd_offset(dir, address) ((pmd_t *) pud_page_vaddr(*(dir)) + \ + pmd_index(address)) +#define pmd_none(x) (!pmd_val(x)) +#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT) +#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0) +#define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot))) +#define pmd_pfn(x) ((pmd_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT) + +#define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT) +#define pgoff_to_pte(off) ((pte_t) { ((off) << PAGE_SHIFT) | _PAGE_FILE }) +#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT + +/* PTE - Level 1 access. */ + +/* page, protection -> pte */ +#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) +#define mk_pte_huge(entry) (pte_val(entry) |= _PAGE_PRESENT | _PAGE_PSE) + +/* Change flags of a PTE */ +static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) +{ + pte_val(pte) &= _PAGE_CHG_MASK; + pte_val(pte) |= pgprot_val(newprot); + pte_val(pte) &= __supported_pte_mask; + return pte; +} + +#define pte_index(address) \ + (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +#define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \ + pte_index(address)) + +/* x86-64 always has all page tables mapped. */ +#define pte_offset_map(dir,address) pte_offset_kernel(dir,address) +#define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address) +#define pte_unmap(pte) /* NOP */ +#define pte_unmap_nested(pte) /* NOP */ + +#define update_mmu_cache(vma,address,pte) do { } while (0) + +/* We only update the dirty/accessed state if we set + * the dirty bit by hand in the kernel, since the hardware + * will do the accessed bit for us, and we don't want to + * race with other CPU's that might be updating the dirty + * bit at the same time. */ +#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS +#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed && __dirty) { \ + set_pte(__ptep, __entry); \ + flush_tlb_page(__vma, __address); \ + } \ + __changed; \ +}) + +/* Encode and de-code a swap entry */ +#define __swp_type(x) (((x).val >> 1) & 0x3f) +#define __swp_offset(x) ((x).val >> 8) +#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) }) +#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) +#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) + +extern spinlock_t pgd_lock; +extern struct list_head pgd_list; + +extern int kern_addr_valid(unsigned long addr); + +pte_t *lookup_address(unsigned long addr); + +#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ + remap_pfn_range(vma, vaddr, pfn, size, prot) + +#define HAVE_ARCH_UNMAPPED_AREA + +#define pgtable_cache_init() do { } while (0) +#define check_pgt_cache() do { } while (0) + +#define PAGE_AGP PAGE_KERNEL_NOCACHE +#define HAVE_PAGE_AGP 1 + +/* fs/proc/kcore.c */ +#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK) +#define kc_offset_to_vaddr(o) \ + (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o)) + +#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG +#define __HAVE_ARCH_PTEP_GET_AND_CLEAR +#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL +#define __HAVE_ARCH_PTEP_SET_WRPROTECT +#define __HAVE_ARCH_PTE_SAME +#include <asm-generic/pgtable.h> +#endif /* !__ASSEMBLY__ */ + +#endif /* _X86_64_PGTABLE_H */ |