pgtable.h
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上传日期:2013-04-10
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- /*
- * 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) 1994, 95, 96, 97, 98, 99, 2000 by Ralf Baechle at alii
- * Copyright (C) 1999 Silicon Graphics, Inc.
- */
- #ifndef _ASM_PGTABLE_H
- #define _ASM_PGTABLE_H
- #include <linux/config.h>
- #include <asm/addrspace.h>
- #include <asm/page.h>
- #include <linux/linkage.h>
- #include <asm/cachectl.h>
- #include <asm/fixmap.h>
- /* Cache flushing:
- *
- * - flush_cache_all() flushes entire cache
- * - flush_cache_mm(mm) flushes the specified mm context's cache lines
- * - flush_cache_page(mm, vmaddr) flushes a single page
- * - flush_cache_range(mm, start, end) flushes a range of pages
- * - flush_page_to_ram(page) write back kernel page to ram
- * - flush_icache_range(start, end) flush a range of instructions
- *
- * - flush_cache_sigtramp() flush signal trampoline
- * - flush_icache_all() flush the entire instruction cache
- */
- extern void (*_flush_cache_all)(void);
- extern void (*___flush_cache_all)(void);
- extern void (*_flush_cache_mm)(struct mm_struct *mm);
- extern void (*_flush_cache_range)(struct mm_struct *mm, unsigned long start,
- unsigned long end);
- extern void (*_flush_cache_page)(struct vm_area_struct *vma,
- unsigned long page);
- extern void (*_flush_page_to_ram)(struct page * page);
- extern void (*_flush_icache_range)(unsigned long start, unsigned long end);
- extern void (*_flush_icache_page)(struct vm_area_struct *vma,
- struct page *page);
- extern void (*_flush_cache_sigtramp)(unsigned long addr);
- extern void (*_flush_icache_all)(void);
- #define flush_dcache_page(page) do { } while (0)
- #define flush_cache_all() _flush_cache_all()
- #define __flush_cache_all() ___flush_cache_all()
- #define flush_cache_mm(mm) _flush_cache_mm(mm)
- #define flush_cache_range(mm,start,end) _flush_cache_range(mm,start,end)
- #define flush_cache_page(vma,page) _flush_cache_page(vma, page)
- #define flush_page_to_ram(page) _flush_page_to_ram(page)
- #define flush_icache_range(start, end) _flush_icache_range(start,end)
- #define flush_icache_user_range(vma, page, addr, len)
- _flush_icache_page((vma), (page))
- #define flush_icache_page(vma, page) _flush_icache_page(vma, page)
- #define flush_cache_sigtramp(addr) _flush_cache_sigtramp(addr)
- #ifdef CONFIG_VTAG_ICACHE
- #define flush_icache_all() _flush_icache_all()
- #else
- #define flush_icache_all() do { } while(0)
- #endif
- /*
- * - add_wired_entry() add a fixed TLB entry, and move wired register
- */
- extern void add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
- unsigned long entryhi, unsigned long pagemask);
- /*
- * - add_temporary_entry() add a temporary TLB entry. We use TLB entries
- * starting at the top and working down. This is for populating the
- * TLB before trap_init() puts the TLB miss handler in place. It
- * should be used only for entries matching the actual page tables,
- * to prevent inconsistencies.
- */
- extern int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
- unsigned long entryhi, unsigned long pagemask);
- /* Basically we have the same two-level (which is the logical three level
- * Linux page table layout folded) page tables as the i386. Some day
- * when we have proper page coloring support we can have a 1% quicker
- * tlb refill handling mechanism, but for now it is a bit slower but
- * works even with the cache aliasing problem the R4k and above have.
- */
- /* PMD_SHIFT determines the size of the area a second-level page table can map */
- #ifdef CONFIG_64BIT_PHYS_ADDR
- #define PMD_SHIFT 21
- #else
- #define PMD_SHIFT 22
- #endif
- #define PMD_SIZE (1UL << PMD_SHIFT)
- #define PMD_MASK (~(PMD_SIZE-1))
- /* PGDIR_SHIFT determines what a third-level page table entry can map */
- #define PGDIR_SHIFT PMD_SHIFT
- #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
- #define PGDIR_MASK (~(PGDIR_SIZE-1))
- /*
- * Entries per page directory level: we use two-level, so
- * we don't really have any PMD directory physically.
- */
- #ifdef CONFIG_64BIT_PHYS_ADDR
- #define PTRS_PER_PTE 512
- #define PTRS_PER_PMD 1
- #define PTRS_PER_PGD 2048
- #define PGD_ORDER 1
- #else
- #define PTRS_PER_PTE 1024
- #define PTRS_PER_PMD 1
- #define PTRS_PER_PGD 1024
- #define PGD_ORDER 0
- #endif
- #define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
- #define FIRST_USER_PGD_NR 0
- #define VMALLOC_START KSEG2
- #define VMALLOC_VMADDR(x) ((unsigned long)(x))
- #if CONFIG_HIGHMEM
- # define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE)
- #else
- # define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
- #endif
- #include <asm/pgtable-bits.h>
- #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
- #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE |
- PAGE_CACHABLE_DEFAULT)
- #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ |
- PAGE_CACHABLE_DEFAULT)
- #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ |
- PAGE_CACHABLE_DEFAULT)
- #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE |
- _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
- #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE |
- PAGE_CACHABLE_DEFAULT)
- #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE |
- __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
- /*
- * MIPS can't do page protection for execute, and considers that the same like
- * read. Also, write permissions imply read permissions. This is the closest
- * we can get by reasonable means..
- */
- #define __P000 PAGE_NONE
- #define __P001 PAGE_READONLY
- #define __P010 PAGE_COPY
- #define __P011 PAGE_COPY
- #define __P100 PAGE_READONLY
- #define __P101 PAGE_READONLY
- #define __P110 PAGE_COPY
- #define __P111 PAGE_COPY
- #define __S000 PAGE_NONE
- #define __S001 PAGE_READONLY
- #define __S010 PAGE_SHARED
- #define __S011 PAGE_SHARED
- #define __S100 PAGE_READONLY
- #define __S101 PAGE_READONLY
- #define __S110 PAGE_SHARED
- #define __S111 PAGE_SHARED
- #ifdef CONFIG_64BIT_PHYS_ADDR
- #define pte_ERROR(e)
- printk("%s:%d: bad pte %016Lx.n", __FILE__, __LINE__, pte_val(e))
- #else
- #define pte_ERROR(e)
- printk("%s:%d: bad pte %08lx.n", __FILE__, __LINE__, pte_val(e))
- #endif
- #define pmd_ERROR(e)
- printk("%s:%d: bad pmd %08lx.n", __FILE__, __LINE__, pmd_val(e))
- #define pgd_ERROR(e)
- printk("%s:%d: bad pgd %08lx.n", __FILE__, __LINE__, pgd_val(e))
- extern unsigned long empty_zero_page;
- extern unsigned long zero_page_mask;
- #define ZERO_PAGE(vaddr)
- (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
- extern void load_pgd(unsigned long pg_dir);
- extern pmd_t invalid_pte_table[PAGE_SIZE/sizeof(pmd_t)];
- /*
- * Conversion functions: convert a page and protection to a page entry,
- * and a page entry and page directory to the page they refer to.
- */
- static inline unsigned long pmd_page(pmd_t pmd)
- {
- return pmd_val(pmd);
- }
- static inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
- {
- pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK);
- }
- static inline int pte_none(pte_t pte) { return !(pte_val(pte) & ~_PAGE_GLOBAL); }
- static inline int pte_present(pte_t pte) { return pte_val(pte) & _PAGE_PRESENT; }
- /* Certain architectures need to do special things when pte's
- * within a page table are directly modified. Thus, the following
- * hook is made available.
- */
- static inline void set_pte(pte_t *ptep, pte_t pteval)
- {
- *ptep = pteval;
- #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
- if (pte_val(pteval) & _PAGE_GLOBAL) {
- pte_t *buddy = ptep_buddy(ptep);
- /*
- * Make sure the buddy is global too (if it's !none,
- * it better already be global)
- */
- if (pte_none(*buddy))
- pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
- }
- #endif
- }
- static inline void pte_clear(pte_t *ptep)
- {
- #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
- /* Preserve global status for the pair */
- if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
- set_pte(ptep, __pte(_PAGE_GLOBAL));
- else
- #endif
- set_pte(ptep, __pte(0));
- }
- /*
- * (pmds are folded into pgds so this doesn't get actually called,
- * but the define is needed for a generic inline function.)
- */
- #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
- #define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
- /*
- * Empty pgd/pmd entries point to the invalid_pte_table.
- */
- static inline int pmd_none(pmd_t pmd)
- {
- return pmd_val(pmd) == (unsigned long) invalid_pte_table;
- }
- static inline int pmd_bad(pmd_t pmd)
- {
- return ((pmd_page(pmd) > (unsigned long) high_memory) ||
- (pmd_page(pmd) < PAGE_OFFSET));
- }
- static inline int pmd_present(pmd_t pmd)
- {
- return (pmd_val(pmd) != (unsigned long) invalid_pte_table);
- }
- static inline void pmd_clear(pmd_t *pmdp)
- {
- pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
- }
- /*
- * The "pgd_xxx()" functions here are trivial for a folded two-level
- * setup: the pgd is never bad, and a pmd always exists (as it's folded
- * into the pgd entry)
- */
- static inline int pgd_none(pgd_t pgd) { return 0; }
- static inline int pgd_bad(pgd_t pgd) { return 0; }
- static inline int pgd_present(pgd_t pgd) { return 1; }
- static inline void pgd_clear(pgd_t *pgdp) { }
- /*
- * Permanent address of a page. Obviously must never be called on a highmem
- * page.
- */
- #ifdef CONFIG_CPU_VR41XX
- #define pte_page(x) (mem_map+(unsigned long)((pte_val(x) >> (PAGE_SHIFT + 2))))
- #else
- #define pte_page(x) (mem_map+(unsigned long)((pte_val(x) >> PAGE_SHIFT)))
- #endif
- /*
- * The following only work if pte_present() is true.
- * Undefined behaviour if not..
- */
- static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
- static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
- static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
- static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
- static inline pte_t pte_wrprotect(pte_t pte)
- {
- pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
- return pte;
- }
- static inline pte_t pte_rdprotect(pte_t pte)
- {
- pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
- return pte;
- }
- static inline pte_t pte_mkclean(pte_t pte)
- {
- pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
- return pte;
- }
- static inline pte_t pte_mkold(pte_t pte)
- {
- pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
- return pte;
- }
- static inline pte_t pte_mkwrite(pte_t pte)
- {
- pte_val(pte) |= _PAGE_WRITE;
- if (pte_val(pte) & _PAGE_MODIFIED)
- pte_val(pte) |= _PAGE_SILENT_WRITE;
- return pte;
- }
- static inline pte_t pte_mkread(pte_t pte)
- {
- pte_val(pte) |= _PAGE_READ;
- if (pte_val(pte) & _PAGE_ACCESSED)
- pte_val(pte) |= _PAGE_SILENT_READ;
- return pte;
- }
- static inline pte_t pte_mkdirty(pte_t pte)
- {
- pte_val(pte) |= _PAGE_MODIFIED;
- if (pte_val(pte) & _PAGE_WRITE)
- pte_val(pte) |= _PAGE_SILENT_WRITE;
- return pte;
- }
- /*
- * Macro to make mark a page protection value as "uncacheable". Note
- * that "protection" is really a misnomer here as the protection value
- * contains the memory attribute bits, dirty bits, and various other
- * bits as well.
- */
- #define pgprot_noncached pgprot_noncached
- static inline pgprot_t pgprot_noncached(pgprot_t _prot)
- {
- unsigned long prot = pgprot_val(_prot);
- prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
- return __pgprot(prot);
- }
- static inline pte_t pte_mkyoung(pte_t pte)
- {
- pte_val(pte) |= _PAGE_ACCESSED;
- if (pte_val(pte) & _PAGE_READ)
- pte_val(pte) |= _PAGE_SILENT_READ;
- return 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.
- */
- #ifdef CONFIG_CPU_VR41XX
- #define mk_pte(page, pgprot)
- ({
- pte_t __pte;
-
- pte_val(__pte) = ((phys_t)(page - mem_map) << (PAGE_SHIFT + 2)) |
- pgprot_val(pgprot);
-
- __pte;
- })
- #else
- #define mk_pte(page, pgprot)
- ({
- pte_t __pte;
-
- pte_val(__pte) = ((phys_t)(page - mem_map) << PAGE_SHIFT) |
- pgprot_val(pgprot);
-
- __pte;
- })
- #endif
- static inline pte_t mk_pte_phys(phys_t physpage, pgprot_t pgprot)
- {
- #ifdef CONFIG_CPU_VR41XX
- return __pte((physpage << 2) | pgprot_val(pgprot));
- #else
- return __pte(physpage | pgprot_val(pgprot));
- #endif
- }
- static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
- {
- return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
- }
- #define page_pte(page) page_pte_prot(page, __pgprot(0))
- #define __pgd_offset(address) pgd_index(address)
- #define __pmd_offset(address)
- (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
- /* to find an entry in a kernel page-table-directory */
- #define pgd_offset_k(address) pgd_offset(&init_mm, address)
- #define pgd_index(address) ((address) >> PGDIR_SHIFT)
- /* to find an entry in a page-table-directory */
- static inline pgd_t *pgd_offset(struct mm_struct *mm, unsigned long address)
- {
- return mm->pgd + pgd_index(address);
- }
- /* Find an entry in the second-level page table.. */
- static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address)
- {
- return (pmd_t *) dir;
- }
- /* Find an entry in the third-level page table.. */
- static inline pte_t *pte_offset(pmd_t * dir, unsigned long address)
- {
- return (pte_t *) (pmd_page(*dir)) +
- ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
- }
- extern int do_check_pgt_cache(int, int);
- extern pgd_t swapper_pg_dir[1024];
- extern void paging_init(void);
- extern void update_mmu_cache(struct vm_area_struct *vma,
- unsigned long address, pte_t pte);
- /* Swap entries must have VALID and GLOBAL bits cleared. */
- #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
- #define SWP_TYPE(x) (((x).val >> 1) & 0x7f)
- #define SWP_OFFSET(x) ((x).val >> 10)
- #define SWP_ENTRY(type,offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 10) })
- #else
- #define SWP_TYPE(x) (((x).val >> 1) & 0x1f)
- #define SWP_OFFSET(x) ((x).val >> 8)
- #define SWP_ENTRY(type,offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
- #endif
- #define pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
- #define swp_entry_to_pte(x) ((pte_t) { (x).val })
- /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
- #define PageSkip(page) (0)
- #define kern_addr_valid(addr) (1)
- #include <asm-generic/pgtable.h>
- /*
- * We provide our own get_unmapped area to cope with the virtual aliasing
- * constraints placed on us by the cache architecture.
- */
- #define HAVE_ARCH_UNMAPPED_AREA
- #define io_remap_page_range remap_page_range
- /*
- * No page table caches to initialise
- */
- #define pgtable_cache_init() do { } while (0)
- #endif /* _ASM_PGTABLE_H */