pgtable.h
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上传日期:2013-04-10
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- #ifndef _PARISC_PGTABLE_H
- #define _PARISC_PGTABLE_H
- #include <asm/fixmap.h>
- #ifndef __ASSEMBLY__
- /*
- * we simulate an x86-style page table for the linux mm code
- */
- #include <linux/spinlock.h>
- #include <asm/processor.h>
- #include <asm/cache.h>
- #include <asm/bitops.h>
- #define ARCH_STACK_GROWSUP
- /*
- * kern_addr_valid(ADDR) tests if ADDR is pointing to valid kernel
- * memory. For the return value to be meaningful, ADDR must be >=
- * PAGE_OFFSET. This operation can be relatively expensive (e.g.,
- * require a hash-, or multi-level tree-lookup or something of that
- * sort) but it guarantees to return TRUE only if accessing the page
- * at that address does not cause an error. Note that there may be
- * addresses for which kern_addr_valid() returns FALSE even though an
- * access would not cause an error (e.g., this is typically true for
- * memory mapped I/O regions.
- *
- * XXX Need to implement this for parisc.
- */
- #define kern_addr_valid(addr) (1)
- /* Certain architectures need to do special things when PTEs
- * within a page table are directly modified. Thus, the following
- * hook is made available.
- */
- #define set_pte(pteptr, pteval)
- do{
- *(pteptr) = (pteval);
- } while(0)
- #endif /* !__ASSEMBLY__ */
- #define pte_ERROR(e)
- printk("%s:%d: bad pte %08lx.n", __FILE__, __LINE__, pte_val(e))
- #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))
- /* Note: If you change ISTACK_SIZE, you need to change the corresponding
- * values in vmlinux.lds and vmlinux64.lds (init_istack section). Also,
- * the "order" and size need to agree.
- */
- #define ISTACK_SIZE 32768 /* Interrupt Stack Size */
- #define ISTACK_ORDER 3
- /*
- * NOTE: Many of the below macros use PT_NLEVELS because
- * it is convenient that PT_NLEVELS == LOG2(pte size in bytes),
- * i.e. we use 3 level page tables when we use 8 byte pte's
- * (for 64 bit) and 2 level page tables when we use 4 byte pte's
- */
- #ifdef __LP64__
- #define PT_NLEVELS 3
- #define PT_INITIAL 4 /* Number of initial page tables */
- #else
- #define PT_NLEVELS 2
- #define PT_INITIAL 2 /* Number of initial page tables */
- #endif
- #define MAX_ADDRBITS (PAGE_SHIFT + (PT_NLEVELS)*(PAGE_SHIFT - PT_NLEVELS))
- #define MAX_ADDRESS (1UL << MAX_ADDRBITS)
- #define SPACEID_SHIFT (MAX_ADDRBITS - 32)
- /* Definitions for 1st level */
- #define PGDIR_SHIFT (PAGE_SHIFT + (PT_NLEVELS - 1)*(PAGE_SHIFT - PT_NLEVELS))
- #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
- #define PGDIR_MASK (~(PGDIR_SIZE-1))
- #define PTRS_PER_PGD (1UL << (PAGE_SHIFT - PT_NLEVELS))
- #define USER_PTRS_PER_PGD PTRS_PER_PGD
- /* Definitions for 2nd level */
- #define pgtable_cache_init() do { } while (0)
- #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PT_NLEVELS))
- #define PMD_SIZE (1UL << PMD_SHIFT)
- #define PMD_MASK (~(PMD_SIZE-1))
- #if PT_NLEVELS == 3
- #define PTRS_PER_PMD (1UL << (PAGE_SHIFT - PT_NLEVELS))
- #else
- #define PTRS_PER_PMD 1
- #endif
- /* Definitions for 3rd level */
- #define PTRS_PER_PTE (1UL << (PAGE_SHIFT - PT_NLEVELS))
- /*
- * pgd entries used up by user/kernel:
- */
- #define FIRST_USER_PGD_NR 0
- #ifndef __ASSEMBLY__
- extern void *vmalloc_start;
- #define PCXL_DMA_MAP_SIZE (8*1024*1024)
- #define VMALLOC_START ((unsigned long)vmalloc_start)
- #define VMALLOC_VMADDR(x) ((unsigned long)(x))
- #define VMALLOC_END (FIXADDR_START)
- #endif
- /* NB: The tlb miss handlers make certain assumptions about the order */
- /* of the following bits, so be careful (One example, bits 25-31 */
- /* are moved together in one instruction). */
- #define _PAGE_READ_BIT 31 /* (0x001) read access allowed */
- #define _PAGE_WRITE_BIT 30 /* (0x002) write access allowed */
- #define _PAGE_EXEC_BIT 29 /* (0x004) execute access allowed */
- #define _PAGE_GATEWAY_BIT 28 /* (0x008) privilege promotion allowed */
- #define _PAGE_DMB_BIT 27 /* (0x010) Data Memory Break enable (B bit) */
- #define _PAGE_DIRTY_BIT 26 /* (0x020) Page Dirty (D bit) */
- #define _PAGE_REFTRAP_BIT 25 /* (0x040) Page Ref. Trap enable (T bit) */
- #define _PAGE_NO_CACHE_BIT 24 /* (0x080) Uncached Page (U bit) */
- #define _PAGE_ACCESSED_BIT 23 /* (0x100) Software: Page Accessed */
- #define _PAGE_PRESENT_BIT 22 /* (0x200) Software: translation valid */
- #define _PAGE_FLUSH_BIT 21 /* (0x400) Software: translation valid */
- /* for cache flushing only */
- #define _PAGE_USER_BIT 20 /* (0x800) Software: User accessable page */
- /* N.B. The bits are defined in terms of a 32 bit word above, so the */
- /* following macro is ok for both 32 and 64 bit. */
- #define xlate_pabit(x) (31 - x)
- #define _PAGE_READ (1 << xlate_pabit(_PAGE_READ_BIT))
- #define _PAGE_WRITE (1 << xlate_pabit(_PAGE_WRITE_BIT))
- #define _PAGE_RW (_PAGE_READ | _PAGE_WRITE)
- #define _PAGE_EXEC (1 << xlate_pabit(_PAGE_EXEC_BIT))
- #define _PAGE_GATEWAY (1 << xlate_pabit(_PAGE_GATEWAY_BIT))
- #define _PAGE_DMB (1 << xlate_pabit(_PAGE_DMB_BIT))
- #define _PAGE_DIRTY (1 << xlate_pabit(_PAGE_DIRTY_BIT))
- #define _PAGE_REFTRAP (1 << xlate_pabit(_PAGE_REFTRAP_BIT))
- #define _PAGE_NO_CACHE (1 << xlate_pabit(_PAGE_NO_CACHE_BIT))
- #define _PAGE_ACCESSED (1 << xlate_pabit(_PAGE_ACCESSED_BIT))
- #define _PAGE_PRESENT (1 << xlate_pabit(_PAGE_PRESENT_BIT))
- #define _PAGE_FLUSH (1 << xlate_pabit(_PAGE_FLUSH_BIT))
- #define _PAGE_USER (1 << xlate_pabit(_PAGE_USER_BIT))
- #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | _PAGE_DIRTY | _PAGE_ACCESSED)
- #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
- #define _PAGE_KERNEL (_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_WRITE | _PAGE_DIRTY | _PAGE_ACCESSED)
- #ifndef __ASSEMBLY__
- #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
- #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_ACCESSED)
- /* Others seem to make this executable, I don't know if that's correct
- or not. The stack is mapped this way though so this is necessary
- in the short term - dhd@linuxcare.com, 2000-08-08 */
- #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_ACCESSED)
- #define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITE | _PAGE_ACCESSED)
- #define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_EXEC |_PAGE_ACCESSED)
- #define PAGE_COPY PAGE_EXECREAD
- #define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC |_PAGE_ACCESSED)
- #define PAGE_KERNEL __pgprot(_PAGE_KERNEL)
- #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_DIRTY | _PAGE_ACCESSED)
- #define PAGE_KERNEL_UNC __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
- #define PAGE_GATEWAY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_GATEWAY| _PAGE_READ)
- #define PAGE_FLUSH __pgprot(_PAGE_FLUSH)
- /*
- * We could have an execute only page using "gateway - promote to priv
- * level 3", but that is kind of silly. So, the way things are defined
- * now, we must always have read permission for pages with execute
- * permission. For the fun of it we'll go ahead and support write only
- * pages.
- */
- /*xwr*/
- #define __P000 PAGE_NONE
- #define __P001 PAGE_READONLY
- #define __P010 __P000 /* copy on write */
- #define __P011 __P001 /* copy on write */
- #define __P100 PAGE_EXECREAD
- #define __P101 PAGE_EXECREAD
- #define __P110 __P100 /* copy on write */
- #define __P111 __P101 /* copy on write */
- #define __S000 PAGE_NONE
- #define __S001 PAGE_READONLY
- #define __S010 PAGE_WRITEONLY
- #define __S011 PAGE_SHARED
- #define __S100 PAGE_EXECREAD
- #define __S101 PAGE_EXECREAD
- #define __S110 PAGE_RWX
- #define __S111 PAGE_RWX
- extern pgd_t swapper_pg_dir[]; /* declared in init_task.c */
- /* initial page tables for 0-8MB for kernel */
- extern unsigned long pg0[];
- /* zero page used for uninitialized stuff */
- extern unsigned long *empty_zero_page;
- /*
- * ZERO_PAGE is a global shared page that is always zero: used
- * for zero-mapped memory areas etc..
- */
- #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
- #define pte_none(x) ((pte_val(x) == 0) || (pte_val(x) & _PAGE_FLUSH))
- #define pte_present(x) (pte_val(x) & _PAGE_PRESENT)
- #define pte_clear(xp) do { pte_val(*(xp)) = 0; } while (0)
- #define pmd_none(x) (!pmd_val(x))
- #define pmd_bad(x) ((pmd_val(x) & ~PAGE_MASK) != _PAGE_TABLE)
- #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
- #define pmd_clear(xp) do { pmd_val(*(xp)) = 0; } while (0)
- #ifdef __LP64__
- #define pgd_page(pgd) ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
- /* For 64 bit we have three level tables */
- #define pgd_none(x) (!pgd_val(x))
- #define pgd_bad(x) ((pgd_val(x) & ~PAGE_MASK) != _PAGE_TABLE)
- #define pgd_present(x) (pgd_val(x) & _PAGE_PRESENT)
- #define pgd_clear(xp) do { pgd_val(*(xp)) = 0; } while (0)
- #else
- /*
- * 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)
- */
- extern inline int pgd_none(pgd_t pgd) { return 0; }
- extern inline int pgd_bad(pgd_t pgd) { return 0; }
- extern inline int pgd_present(pgd_t pgd) { return 1; }
- extern inline void pgd_clear(pgd_t * pgdp) { }
- #endif
- /*
- * The following only work if pte_present() is true.
- * Undefined behaviour if not..
- */
- extern inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
- extern inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
- extern inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
- extern inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
- extern inline pte_t pte_rdprotect(pte_t pte) { pte_val(pte) &= ~_PAGE_READ; return pte; }
- extern inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
- extern inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
- extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~_PAGE_WRITE; return pte; }
- extern inline pte_t pte_mkread(pte_t pte) { pte_val(pte) |= _PAGE_READ; return pte; }
- extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; }
- extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
- extern inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= _PAGE_WRITE; 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.
- */
- #define __mk_pte(addr,pgprot)
- ({
- pte_t __pte;
-
- pte_val(__pte) = ((addr)+pgprot_val(pgprot));
-
- __pte;
- })
- #ifdef CONFIG_DISCONTIGMEM
- #define PAGE_TO_PA(page)
- ((((page)-(page)->zone->zone_mem_map) << PAGE_SHIFT)
- + ((page)->zone->zone_start_paddr))
- #else
- #define PAGE_TO_PA(page) ((page - mem_map) << PAGE_SHIFT)
- #endif
- #define mk_pte(page, pgprot)
- ({
- pte_t __pte;
-
- pte_val(__pte) = ((unsigned long)(PAGE_TO_PA(page))) |
- pgprot_val(pgprot);
-
- __pte;
- })
- /* This takes a physical page address that is used by the remapping functions */
- #define mk_pte_phys(physpage, pgprot)
- ({ pte_t __pte; pte_val(__pte) = physpage + pgprot_val(pgprot); __pte; })
- extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
- { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
- /* Permanent address of a page. On parisc we don't have highmem. */
- #ifdef CONFIG_DISCONTIGMEM
- #define pte_page(x) (phys_to_page(pte_val(x)))
- #else
- #define pte_page(x) (mem_map+(pte_val(x) >> PAGE_SHIFT))
- #endif
- #define pmd_page(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
- #define pgd_index(address) ((address) >> PGDIR_SHIFT)
- /* to find an entry in a page-table-directory */
- #define pgd_offset(mm, address)
- ((mm)->pgd + ((address) >> PGDIR_SHIFT))
- /* to find an entry in a kernel page-table-directory */
- #define pgd_offset_k(address) pgd_offset(&init_mm, address)
- /* Find an entry in the second-level page table.. */
- #ifdef __LP64__
- #define pmd_offset(dir,address)
- ((pmd_t *) pgd_page(*(dir)) + (((address)>>PMD_SHIFT) & (PTRS_PER_PMD-1)))
- #else
- #define pmd_offset(dir,addr) ((pmd_t *) dir)
- #endif
- /* Find an entry in the third-level page table.. */
- #define pte_offset(pmd, address)
- ((pte_t *) pmd_page(*(pmd)) + (((address)>>PAGE_SHIFT) & (PTRS_PER_PTE-1)))
- extern void paging_init (void);
- /* Used for deferring calls to flush_dcache_page() */
- #define PG_dcache_dirty PG_arch_1
- struct vm_area_struct; /* forward declaration (include/linux/mm.h) */
- extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);
- /* Encode and de-code a swap entry */
- #define SWP_TYPE(x) ((x).val & 0x1f)
- #define SWP_OFFSET(x) ( (((x).val >> 5) & 0xf) |
- (((x).val >> 7) & ~0xf) )
- #define SWP_ENTRY(type, offset) ((swp_entry_t) { (type) |
- ((offset & 0xf) << 5) |
- ((offset & ~0xf) << 7) })
- #define pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
- #define swp_entry_to_pte(x) ((pte_t) { (x).val })
- static inline int ptep_test_and_clear_young(pte_t *ptep)
- {
- #ifdef CONFIG_SMP
- return test_and_clear_bit(xlate_pabit(_PAGE_ACCESSED_BIT), ptep);
- #else
- pte_t pte = *ptep;
- if (!pte_young(pte))
- return 0;
- set_pte(ptep, pte_mkold(pte));
- return 1;
- #endif
- }
- static inline int ptep_test_and_clear_dirty(pte_t *ptep)
- {
- #ifdef CONFIG_SMP
- return test_and_clear_bit(xlate_pabit(_PAGE_DIRTY_BIT), ptep);
- #else
- pte_t pte = *ptep;
- if (!pte_dirty(pte))
- return 0;
- set_pte(ptep, pte_mkclean(pte));
- return 1;
- #endif
- }
- #ifdef CONFIG_SMP
- extern spinlock_t pa_dbit_lock;
- #else
- static int pa_dbit_lock; /* dummy to keep the compilers happy */
- #endif
- static inline pte_t ptep_get_and_clear(pte_t *ptep)
- {
- pte_t old_pte;
- pte_t pte;
- spin_lock(&pa_dbit_lock);
- pte = old_pte = *ptep;
- pte_val(pte) &= ~_PAGE_PRESENT;
- pte_val(pte) |= _PAGE_FLUSH;
- set_pte(ptep,pte);
- spin_unlock(&pa_dbit_lock);
- return old_pte;
- }
- static inline void ptep_set_wrprotect(pte_t *ptep)
- {
- #ifdef CONFIG_SMP
- unsigned long new, old;
- do {
- old = pte_val(*ptep);
- new = pte_val(pte_wrprotect(__pte (old)));
- } while (cmpxchg((unsigned long *) ptep, old, new) != old);
- #else
- pte_t old_pte = *ptep;
- set_pte(ptep, pte_wrprotect(old_pte));
- #endif
- }
- static inline void ptep_mkdirty(pte_t *ptep)
- {
- #ifdef CONFIG_SMP
- set_bit(xlate_pabit(_PAGE_DIRTY_BIT), ptep);
- #else
- pte_t old_pte = *ptep;
- set_pte(ptep, pte_mkdirty(old_pte));
- #endif
- }
- #define pte_same(A,B) (pte_val(A) == pte_val(B))
- #endif /* !__ASSEMBLY__ */
- /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
- #define PageSkip(page) (0)
- #define io_remap_page_range remap_page_range
- /* We provide our own get_unmapped_area to provide cache coherency */
- #define HAVE_ARCH_UNMAPPED_AREA
- #endif /* _PARISC_PGTABLE_H */