+++ /dev/null
-#ifndef _ALPHA_PGTABLE_H
-#define _ALPHA_PGTABLE_H
-
-#include <asm-generic/4level-fixup.h>
-
-/*
- * This file contains the functions and defines necessary to modify and use
- * the Alpha page table tree.
- *
- * This hopefully works with any standard Alpha page-size, as defined
- * in <asm/page.h> (currently 8192).
- */
-#include <linux/mmzone.h>
-
-#include <asm/page.h>
-#include <asm/processor.h> /* For TASK_SIZE */
-#include <asm/machvec.h>
-
-struct mm_struct;
-struct vm_area_struct;
-
-/* 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) ((*(pteptr)) = (pteval))
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
-
-/* PMD_SHIFT determines the size of the area a second-level page table can map */
-#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3))
-#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 (PAGE_SHIFT + 2*(PAGE_SHIFT-3))
-#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
-#define PGDIR_MASK (~(PGDIR_SIZE-1))
-
-/*
- * Entries per page directory level: the Alpha is three-level, with
- * all levels having a one-page page table.
- */
-#define PTRS_PER_PTE (1UL << (PAGE_SHIFT-3))
-#define PTRS_PER_PMD (1UL << (PAGE_SHIFT-3))
-#define PTRS_PER_PGD (1UL << (PAGE_SHIFT-3))
-#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
-#define FIRST_USER_ADDRESS 0
-
-/* Number of pointers that fit on a page: this will go away. */
-#define PTRS_PER_PAGE (1UL << (PAGE_SHIFT-3))
-
-#ifdef CONFIG_ALPHA_LARGE_VMALLOC
-#define VMALLOC_START 0xfffffe0000000000
-#else
-#define VMALLOC_START (-2*PGDIR_SIZE)
-#endif
-#define VMALLOC_END (-PGDIR_SIZE)
-
-/*
- * OSF/1 PAL-code-imposed page table bits
- */
-#define _PAGE_VALID 0x0001
-#define _PAGE_FOR 0x0002 /* used for page protection (fault on read) */
-#define _PAGE_FOW 0x0004 /* used for page protection (fault on write) */
-#define _PAGE_FOE 0x0008 /* used for page protection (fault on exec) */
-#define _PAGE_ASM 0x0010
-#define _PAGE_KRE 0x0100 /* xxx - see below on the "accessed" bit */
-#define _PAGE_URE 0x0200 /* xxx */
-#define _PAGE_KWE 0x1000 /* used to do the dirty bit in software */
-#define _PAGE_UWE 0x2000 /* used to do the dirty bit in software */
-
-/* .. and these are ours ... */
-#define _PAGE_DIRTY 0x20000
-#define _PAGE_ACCESSED 0x40000
-#define _PAGE_FILE 0x80000 /* set:pagecache, unset:swap */
-
-/*
- * NOTE! The "accessed" bit isn't necessarily exact: it can be kept exactly
- * by software (use the KRE/URE/KWE/UWE bits appropriately), but I'll fake it.
- * Under Linux/AXP, the "accessed" bit just means "read", and I'll just use
- * the KRE/URE bits to watch for it. That way we don't need to overload the
- * KWE/UWE bits with both handling dirty and accessed.
- *
- * Note that the kernel uses the accessed bit just to check whether to page
- * out a page or not, so it doesn't have to be exact anyway.
- */
-
-#define __DIRTY_BITS (_PAGE_DIRTY | _PAGE_KWE | _PAGE_UWE)
-#define __ACCESS_BITS (_PAGE_ACCESSED | _PAGE_KRE | _PAGE_URE)
-
-#define _PFN_MASK 0xFFFFFFFF00000000UL
-
-#define _PAGE_TABLE (_PAGE_VALID | __DIRTY_BITS | __ACCESS_BITS)
-#define _PAGE_CHG_MASK (_PFN_MASK | __DIRTY_BITS | __ACCESS_BITS)
-
-/*
- * All the normal masks have the "page accessed" bits on, as any time they are used,
- * the page is accessed. They are cleared only by the page-out routines
- */
-#define PAGE_NONE __pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOR | _PAGE_FOW | _PAGE_FOE)
-#define PAGE_SHARED __pgprot(_PAGE_VALID | __ACCESS_BITS)
-#define PAGE_COPY __pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOW)
-#define PAGE_READONLY __pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOW)
-#define PAGE_KERNEL __pgprot(_PAGE_VALID | _PAGE_ASM | _PAGE_KRE | _PAGE_KWE)
-
-#define _PAGE_NORMAL(x) __pgprot(_PAGE_VALID | __ACCESS_BITS | (x))
-
-#define _PAGE_P(x) _PAGE_NORMAL((x) | (((x) & _PAGE_FOW)?0:_PAGE_FOW))
-#define _PAGE_S(x) _PAGE_NORMAL(x)
-
-/*
- * The hardware can handle write-only mappings, but as the Alpha
- * architecture does byte-wide writes with a read-modify-write
- * sequence, it's not practical to have write-without-read privs.
- * Thus the "-w- -> rw-" and "-wx -> rwx" mapping here (and in
- * arch/alpha/mm/fault.c)
- */
- /* xwr */
-#define __P000 _PAGE_P(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR)
-#define __P001 _PAGE_P(_PAGE_FOE | _PAGE_FOW)
-#define __P010 _PAGE_P(_PAGE_FOE)
-#define __P011 _PAGE_P(_PAGE_FOE)
-#define __P100 _PAGE_P(_PAGE_FOW | _PAGE_FOR)
-#define __P101 _PAGE_P(_PAGE_FOW)
-#define __P110 _PAGE_P(0)
-#define __P111 _PAGE_P(0)
-
-#define __S000 _PAGE_S(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR)
-#define __S001 _PAGE_S(_PAGE_FOE | _PAGE_FOW)
-#define __S010 _PAGE_S(_PAGE_FOE)
-#define __S011 _PAGE_S(_PAGE_FOE)
-#define __S100 _PAGE_S(_PAGE_FOW | _PAGE_FOR)
-#define __S101 _PAGE_S(_PAGE_FOW)
-#define __S110 _PAGE_S(0)
-#define __S111 _PAGE_S(0)
-
-/*
- * pgprot_noncached() is only for infiniband pci support, and a real
- * implementation for RAM would be more complicated.
- */
-#define pgprot_noncached(prot) (prot)
-
-/*
- * BAD_PAGETABLE is used when we need a bogus page-table, while
- * BAD_PAGE is used for a bogus page.
- *
- * ZERO_PAGE is a global shared page that is always zero: used
- * for zero-mapped memory areas etc..
- */
-extern pte_t __bad_page(void);
-extern pmd_t * __bad_pagetable(void);
-
-extern unsigned long __zero_page(void);
-
-#define BAD_PAGETABLE __bad_pagetable()
-#define BAD_PAGE __bad_page()
-#define ZERO_PAGE(vaddr) (virt_to_page(ZERO_PGE))
-
-/* number of bits that fit into a memory pointer */
-#define BITS_PER_PTR (8*sizeof(unsigned long))
-
-/* to align the pointer to a pointer address */
-#define PTR_MASK (~(sizeof(void*)-1))
-
-/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
-#define SIZEOF_PTR_LOG2 3
-
-/* to find an entry in a page-table */
-#define PAGE_PTR(address) \
- ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
-
-/*
- * On certain platforms whose physical address space can overlap KSEG,
- * namely EV6 and above, we must re-twiddle the physaddr to restore the
- * correct high-order bits.
- *
- * This is extremely confusing until you realize that this is actually
- * just working around a userspace bug. The X server was intending to
- * provide the physical address but instead provided the KSEG address.
- * Or tried to, except it's not representable.
- *
- * On Tsunami there's nothing meaningful at 0x40000000000, so this is
- * a safe thing to do. Come the first core logic that does put something
- * in this area -- memory or whathaveyou -- then this hack will have
- * to go away. So be prepared!
- */
-
-#if defined(CONFIG_ALPHA_GENERIC) && defined(USE_48_BIT_KSEG)
-#error "EV6-only feature in a generic kernel"
-#endif
-#if defined(CONFIG_ALPHA_GENERIC) || \
- (defined(CONFIG_ALPHA_EV6) && !defined(USE_48_BIT_KSEG))
-#define KSEG_PFN (0xc0000000000UL >> PAGE_SHIFT)
-#define PHYS_TWIDDLE(pfn) \
- ((((pfn) & KSEG_PFN) == (0x40000000000UL >> PAGE_SHIFT)) \
- ? ((pfn) ^= KSEG_PFN) : (pfn))
-#else
-#define PHYS_TWIDDLE(pfn) (pfn)
-#endif
-
-/*
- * Conversion functions: convert a page and protection to a page entry,
- * and a page entry and page directory to the page they refer to.
- */
-#ifndef CONFIG_DISCONTIGMEM
-#define page_to_pa(page) (((page) - mem_map) << PAGE_SHIFT)
-
-#define pte_pfn(pte) (pte_val(pte) >> 32)
-#define pte_page(pte) pfn_to_page(pte_pfn(pte))
-#define mk_pte(page, pgprot) \
-({ \
- pte_t pte; \
- \
- pte_val(pte) = (page_to_pfn(page) << 32) | pgprot_val(pgprot); \
- pte; \
-})
-#endif
-
-extern inline pte_t pfn_pte(unsigned long physpfn, pgprot_t pgprot)
-{ pte_t pte; pte_val(pte) = (PHYS_TWIDDLE(physpfn) << 32) | pgprot_val(pgprot); return 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; }
-
-extern inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
-{ pmd_val(*pmdp) = _PAGE_TABLE | ((((unsigned long) ptep) - PAGE_OFFSET) << (32-PAGE_SHIFT)); }
-
-extern inline void pgd_set(pgd_t * pgdp, pmd_t * pmdp)
-{ pgd_val(*pgdp) = _PAGE_TABLE | ((((unsigned long) pmdp) - PAGE_OFFSET) << (32-PAGE_SHIFT)); }
-
-
-extern inline unsigned long
-pmd_page_vaddr(pmd_t pmd)
-{
- return ((pmd_val(pmd) & _PFN_MASK) >> (32-PAGE_SHIFT)) + PAGE_OFFSET;
-}
-
-#ifndef CONFIG_DISCONTIGMEM
-#define pmd_page(pmd) (mem_map + ((pmd_val(pmd) & _PFN_MASK) >> 32))
-#define pgd_page(pgd) (mem_map + ((pgd_val(pgd) & _PFN_MASK) >> 32))
-#endif
-
-extern inline unsigned long pgd_page_vaddr(pgd_t pgd)
-{ return PAGE_OFFSET + ((pgd_val(pgd) & _PFN_MASK) >> (32-PAGE_SHIFT)); }
-
-extern inline int pte_none(pte_t pte) { return !pte_val(pte); }
-extern inline int pte_present(pte_t pte) { return pte_val(pte) & _PAGE_VALID; }
-extern inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
-{
- pte_val(*ptep) = 0;
-}
-
-extern inline int pmd_none(pmd_t pmd) { return !pmd_val(pmd); }
-extern inline int pmd_bad(pmd_t pmd) { return (pmd_val(pmd) & ~_PFN_MASK) != _PAGE_TABLE; }
-extern inline int pmd_present(pmd_t pmd) { return pmd_val(pmd) & _PAGE_VALID; }
-extern inline void pmd_clear(pmd_t * pmdp) { pmd_val(*pmdp) = 0; }
-
-extern inline int pgd_none(pgd_t pgd) { return !pgd_val(pgd); }
-extern inline int pgd_bad(pgd_t pgd) { return (pgd_val(pgd) & ~_PFN_MASK) != _PAGE_TABLE; }
-extern inline int pgd_present(pgd_t pgd) { return pgd_val(pgd) & _PAGE_VALID; }
-extern inline void pgd_clear(pgd_t * pgdp) { pgd_val(*pgdp) = 0; }
-
-/*
- * The following only work if pte_present() is true.
- * Undefined behaviour if not..
- */
-extern inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_FOW); }
-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_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
-extern inline int pte_special(pte_t pte) { return 0; }
-
-extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOW; return pte; }
-extern inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~(__DIRTY_BITS); return pte; }
-extern inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~(__ACCESS_BITS); return pte; }
-extern inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_FOW; return pte; }
-extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= __DIRTY_BITS; return pte; }
-extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= __ACCESS_BITS; return pte; }
-extern inline pte_t pte_mkspecial(pte_t pte) { return pte; }
-
-#define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
-
-/* to find an entry in a kernel page-table-directory */
-#define pgd_offset_k(address) pgd_offset(&init_mm, (address))
-
-/* to find an entry in a page-table-directory. */
-#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
-#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
-
-/*
- * The smp_read_barrier_depends() in the following functions are required to
- * order the load of *dir (the pointer in the top level page table) with any
- * subsequent load of the returned pmd_t *ret (ret is data dependent on *dir).
- *
- * If this ordering is not enforced, the CPU might load an older value of
- * *ret, which may be uninitialized data. See mm/memory.c:__pte_alloc for
- * more details.
- *
- * Note that we never change the mm->pgd pointer after the task is running, so
- * pgd_offset does not require such a barrier.
- */
-
-/* Find an entry in the second-level page table.. */
-extern inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
-{
- pmd_t *ret = (pmd_t *) pgd_page_vaddr(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1));
- smp_read_barrier_depends(); /* see above */
- return ret;
-}
-
-/* Find an entry in the third-level page table.. */
-extern inline pte_t * pte_offset_kernel(pmd_t * dir, unsigned long address)
-{
- pte_t *ret = (pte_t *) pmd_page_vaddr(*dir)
- + ((address >> PAGE_SHIFT) & (PTRS_PER_PAGE - 1));
- smp_read_barrier_depends(); /* see above */
- return ret;
-}
-
-#define pte_offset_map(dir,addr) pte_offset_kernel((dir),(addr))
-#define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir),(addr))
-#define pte_unmap(pte) do { } while (0)
-#define pte_unmap_nested(pte) do { } while (0)
-
-extern pgd_t swapper_pg_dir[1024];
-
-/*
- * The Alpha doesn't have any external MMU info: the kernel page
- * tables contain all the necessary information.
- */
-extern inline void update_mmu_cache(struct vm_area_struct * vma,
- unsigned long address, pte_t pte)
-{
-}
-
-/*
- * Non-present pages: high 24 bits are offset, next 8 bits type,
- * low 32 bits zero.
- */
-extern inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
-{ pte_t pte; pte_val(pte) = (type << 32) | (offset << 40); return pte; }
-
-#define __swp_type(x) (((x).val >> 32) & 0xff)
-#define __swp_offset(x) ((x).val >> 40)
-#define __swp_entry(type, off) ((swp_entry_t) { pte_val(mk_swap_pte((type), (off))) })
-#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
-#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
-
-#define pte_to_pgoff(pte) (pte_val(pte) >> 32)
-#define pgoff_to_pte(off) ((pte_t) { ((off) << 32) | _PAGE_FILE })
-
-#define PTE_FILE_MAX_BITS 32
-
-#ifndef CONFIG_DISCONTIGMEM
-#define kern_addr_valid(addr) (1)
-#endif
-
-#define io_remap_pfn_range(vma, start, pfn, size, prot) \
- remap_pfn_range(vma, start, pfn, size, prot)
-
-#define pte_ERROR(e) \
- printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
-#define pmd_ERROR(e) \
- printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
-#define pgd_ERROR(e) \
- printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
-
-extern void paging_init(void);
-
-#include <asm-generic/pgtable.h>
-
-/*
- * No page table caches to initialise
- */
-#define pgtable_cache_init() do { } while (0)
-
-/* We have our own get_unmapped_area to cope with ADDR_LIMIT_32BIT. */
-#define HAVE_ARCH_UNMAPPED_AREA
-
-#endif /* _ALPHA_PGTABLE_H */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff