#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 <linux/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[]; #define swapper_pg_dir init_level4_pgt extern void paging_init(void); #endif /* !__ASSEMBLY__ */ #define SHARED_KERNEL_PMD 0 /* * 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)) struct mm_struct; static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { *ptep = native_make_pte(0); } static inline void native_set_pte(pte_t *ptep, pte_t pte) { *ptep = pte; } static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte) { native_set_pte(ptep, pte); } static inline pte_t native_ptep_get_and_clear(pte_t *xp) { #ifdef CONFIG_SMP return native_make_pte(xchg(&xp->pte, 0)); #else /* native_local_ptep_get_and_clear, but duplicated because of cyclic dependency */ pte_t ret = *xp; native_pte_clear(NULL, 0, xp); return ret; #endif } static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd) { *pmdp = pmd; } static inline void native_pmd_clear(pmd_t *pmd) { native_set_pmd(pmd, native_make_pmd(0)); } static inline void native_set_pud(pud_t *pudp, pud_t pud) { *pudp = pud; } static inline void native_pud_clear(pud_t *pud) { native_set_pud(pud, native_make_pud(0)); } static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd) { *pgdp = pgd; } static inline void native_pgd_clear(pgd_t *pgd) { native_set_pgd(pgd, native_make_pgd(0)); } #define pte_same(a, b) ((a).pte == (b).pte) #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 MAXMEM _AC(0x00003fffffffffff, UL) #define VMALLOC_START _AC(0xffffc20000000000, UL) #define VMALLOC_END _AC(0xffffe1ffffffffff, UL) #define VMEMMAP_START _AC(0xffffe20000000000, UL) #define MODULES_VADDR _AC(0xffffffffa0000000, UL) #define MODULES_END _AC(0xfffffffffff00000, UL) #define MODULES_LEN (MODULES_END - MODULES_VADDR) #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 | _PAGE_PSE | _PAGE_NX); } static inline unsigned long pmd_bad(pmd_t pmd) { return pmd_val(pmd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER | _PAGE_PSE | _PAGE_NX); } #define pte_none(x) (!pte_val((x))) #define pte_present(x) (pte_val((x)) & (_PAGE_PRESENT | _PAGE_PROTNONE)) #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) /* * Macro to mark a page protection value as "uncacheable". */ #define pgprot_noncached(prot) \ (__pgprot(pgprot_val((prot)) | _PAGE_PCD | _PAGE_PWT)) /* * 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, address) ((mm)->pgd + pgd_index((address))) #define pgd_offset_k(address) (init_level4_pgt + pgd_index((address))) #define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT) static inline int pgd_large(pgd_t pgd) { return 0; } #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) static inline int pud_large(pud_t pte) { return (pud_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) == (_PAGE_PSE | _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 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) { .pte = ((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 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) extern int direct_gbpages; /* 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) { .pte = (x).val }) extern int kern_addr_valid(unsigned long addr); extern void cleanup_highmap(void); #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ remap_pfn_range(vma, vaddr, pfn, size, prot) #define HAVE_ARCH_UNMAPPED_AREA #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN #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_PTE_SAME #endif /* !__ASSEMBLY__ */ #endif /* _X86_64_PGTABLE_H */