| #ifndef _I386_PGTABLE_H |
| #define _I386_PGTABLE_H |
| |
| |
| /* |
| * The Linux memory management assumes a three-level page table setup. On |
| * the i386, we use that, but "fold" the mid level into the top-level page |
| * table, so that we physically have the same two-level page table as the |
| * i386 mmu expects. |
| * |
| * This file contains the functions and defines necessary to modify and use |
| * the i386 page table tree. |
| */ |
| #ifndef __ASSEMBLY__ |
| #include <asm/processor.h> |
| #include <asm/fixmap.h> |
| #include <linux/threads.h> |
| #include <asm/paravirt.h> |
| |
| #include <linux/bitops.h> |
| #include <linux/slab.h> |
| #include <linux/list.h> |
| #include <linux/spinlock.h> |
| |
| struct mm_struct; |
| struct vm_area_struct; |
| |
| extern pgd_t swapper_pg_dir[1024]; |
| extern struct kmem_cache *pmd_cache; |
| extern spinlock_t pgd_lock; |
| extern struct page *pgd_list; |
| void check_pgt_cache(void); |
| |
| void pmd_ctor(struct kmem_cache *, void *); |
| void pgtable_cache_init(void); |
| void paging_init(void); |
| |
| |
| /* |
| * The Linux x86 paging architecture is 'compile-time dual-mode', it |
| * implements both the traditional 2-level x86 page tables and the |
| * newer 3-level PAE-mode page tables. |
| */ |
| #ifdef CONFIG_X86_PAE |
| # include <asm/pgtable-3level-defs.h> |
| # define PMD_SIZE (1UL << PMD_SHIFT) |
| # define PMD_MASK (~(PMD_SIZE-1)) |
| #else |
| # include <asm/pgtable-2level-defs.h> |
| #endif |
| |
| #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
| #define PGDIR_MASK (~(PGDIR_SIZE-1)) |
| |
| #define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT) |
| #define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS) |
| |
| #define TWOLEVEL_PGDIR_SHIFT 22 |
| #define BOOT_USER_PGD_PTRS (__PAGE_OFFSET >> TWOLEVEL_PGDIR_SHIFT) |
| #define BOOT_KERNEL_PGD_PTRS (1024-BOOT_USER_PGD_PTRS) |
| |
| /* Just any arbitrary offset to the start of the vmalloc VM area: the |
| * current 8MB value just means that there will be a 8MB "hole" after the |
| * physical memory until the kernel virtual memory starts. That means that |
| * any out-of-bounds memory accesses will hopefully be caught. |
| * The vmalloc() routines leaves a hole of 4kB between each vmalloced |
| * area for the same reason. ;) |
| */ |
| #define VMALLOC_OFFSET (8*1024*1024) |
| #define VMALLOC_START (((unsigned long) high_memory + \ |
| 2*VMALLOC_OFFSET-1) & ~(VMALLOC_OFFSET-1)) |
| #ifdef CONFIG_HIGHMEM |
| # define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE) |
| #else |
| # define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE) |
| #endif |
| |
| /* |
| * Define this if things work differently on an i386 and an i486: |
| * it will (on an i486) warn about kernel memory accesses that are |
| * done without a 'access_ok(VERIFY_WRITE,..)' |
| */ |
| #undef TEST_ACCESS_OK |
| |
| /* The boot page tables (all created as a single array) */ |
| extern unsigned long pg0[]; |
| |
| #define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE)) |
| |
| /* To avoid harmful races, pmd_none(x) should check only the lower when PAE */ |
| #define pmd_none(x) (!(unsigned long)pmd_val(x)) |
| #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT) |
| #define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE) |
| |
| |
| #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) |
| |
| #ifdef CONFIG_X86_PAE |
| # include <asm/pgtable-3level.h> |
| #else |
| # include <asm/pgtable-2level.h> |
| #endif |
| |
| /* |
| * clone_pgd_range(pgd_t *dst, pgd_t *src, int count); |
| * |
| * dst - pointer to pgd range anwhere on a pgd page |
| * src - "" |
| * count - the number of pgds to copy. |
| * |
| * dst and src can be on the same page, but the range must not overlap, |
| * and must not cross a page boundary. |
| */ |
| static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count) |
| { |
| memcpy(dst, src, count * sizeof(pgd_t)); |
| } |
| |
| /* |
| * Macro to mark a page protection value as "uncacheable". On processors which do not support |
| * it, this is a no-op. |
| */ |
| #define pgprot_noncached(prot) ((boot_cpu_data.x86 > 3) \ |
| ? (__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT)) : (prot)) |
| |
| /* |
| * Conversion functions: convert a page and protection to a page entry, |
| * and a page entry and page directory to the page they refer to. |
| */ |
| |
| #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) |
| |
| /* |
| * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD] |
| * |
| * this macro returns the index of the entry in the pgd page which would |
| * control the given virtual address |
| */ |
| #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) |
| #define pgd_index_k(addr) pgd_index(addr) |
| |
| /* |
| * pgd_offset() returns a (pgd_t *) |
| * pgd_index() is used get the offset into the pgd page's array of pgd_t's; |
| */ |
| #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address)) |
| |
| /* |
| * a shortcut which implies the use of the kernel's pgd, instead |
| * of a process's |
| */ |
| #define pgd_offset_k(address) pgd_offset(&init_mm, address) |
| |
| /* |
| * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] |
| * |
| * this macro returns the index of the entry in the pmd page which would |
| * control the given virtual address |
| */ |
| #define pmd_index(address) \ |
| (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) |
| |
| /* |
| * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE] |
| * |
| * this macro returns the index of the entry in the pte page which would |
| * control the given virtual address |
| */ |
| #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)) |
| |
| #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)) |
| |
| #define pmd_page_vaddr(pmd) \ |
| ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) |
| |
| /* |
| * Helper function that returns the kernel pagetable entry controlling |
| * the virtual address 'address'. NULL means no pagetable entry present. |
| * NOTE: the return type is pte_t but if the pmd is PSE then we return it |
| * as a pte too. |
| */ |
| extern pte_t *lookup_address(unsigned long address, int *level); |
| |
| #if defined(CONFIG_HIGHPTE) |
| #define pte_offset_map(dir, address) \ |
| ((pte_t *)kmap_atomic_pte(pmd_page(*(dir)),KM_PTE0) + pte_index(address)) |
| #define pte_offset_map_nested(dir, address) \ |
| ((pte_t *)kmap_atomic_pte(pmd_page(*(dir)),KM_PTE1) + pte_index(address)) |
| #define pte_unmap(pte) kunmap_atomic(pte, KM_PTE0) |
| #define pte_unmap_nested(pte) kunmap_atomic(pte, KM_PTE1) |
| #else |
| #define pte_offset_map(dir, address) \ |
| ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address)) |
| #define pte_offset_map_nested(dir, address) pte_offset_map(dir, address) |
| #define pte_unmap(pte) do { } while (0) |
| #define pte_unmap_nested(pte) do { } while (0) |
| #endif |
| |
| /* Clear a kernel PTE and flush it from the TLB */ |
| #define kpte_clear_flush(ptep, vaddr) \ |
| do { \ |
| pte_clear(&init_mm, vaddr, ptep); \ |
| __flush_tlb_one(vaddr); \ |
| } while (0) |
| |
| /* |
| * The i386 doesn't have any external MMU info: the kernel page |
| * tables contain all the necessary information. |
| */ |
| #define update_mmu_cache(vma,address,pte) do { } while (0) |
| |
| void native_pagetable_setup_start(pgd_t *base); |
| void native_pagetable_setup_done(pgd_t *base); |
| |
| #ifndef CONFIG_PARAVIRT |
| static inline void paravirt_pagetable_setup_start(pgd_t *base) |
| { |
| native_pagetable_setup_start(base); |
| } |
| |
| static inline void paravirt_pagetable_setup_done(pgd_t *base) |
| { |
| native_pagetable_setup_done(base); |
| } |
| #endif /* !CONFIG_PARAVIRT */ |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| /* |
| * kern_addr_valid() is (1) for FLATMEM and (0) for |
| * SPARSEMEM and DISCONTIGMEM |
| */ |
| #ifdef CONFIG_FLATMEM |
| #define kern_addr_valid(addr) (1) |
| #else |
| #define kern_addr_valid(kaddr) (0) |
| #endif |
| |
| #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ |
| remap_pfn_range(vma, vaddr, pfn, size, prot) |
| |
| #endif /* _I386_PGTABLE_H */ |