LXR linux/arch/alpha/include/asm/page.h

   1#ifndef _ALPHA_PAGE_H
   2#define _ALPHA_PAGE_H
   3
   4#include <linux/const.h>
   5#include <asm/pal.h>
   6
   7/* PAGE_SHIFT determines the page size */
   8#define PAGE_SHIFT      13
   9#define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  10#define PAGE_MASK       (~(PAGE_SIZE-1))
  11
  12#ifndef __ASSEMBLY__
  13
  14#define STRICT_MM_TYPECHECKS
  15
  16extern void clear_page(void *page);
  17#define clear_user_page(page, vaddr, pg)        clear_page(page)
  18
  19#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  20        alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vmaddr)
  21#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  22
  23extern void copy_page(void * _to, void * _from);
  24#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  25
  26#ifdef STRICT_MM_TYPECHECKS
  27/*
  28 * These are used to make use of C type-checking..
  29 */
  30typedef struct { unsigned long pte; } pte_t;
  31typedef struct { unsigned long pmd; } pmd_t;
  32typedef struct { unsigned long pgd; } pgd_t;
  33typedef struct { unsigned long pgprot; } pgprot_t;
  34
  35#define pte_val(x)      ((x).pte)
  36#define pmd_val(x)      ((x).pmd)
  37#define pgd_val(x)      ((x).pgd)
  38#define pgprot_val(x)   ((x).pgprot)
  39
  40#define __pte(x)        ((pte_t) { (x) } )
  41#define __pmd(x)        ((pmd_t) { (x) } )
  42#define __pgd(x)        ((pgd_t) { (x) } )
  43#define __pgprot(x)     ((pgprot_t) { (x) } )
  44
  45#else
  46/*
  47 * .. while these make it easier on the compiler
  48 */
  49typedef unsigned long pte_t;
  50typedef unsigned long pmd_t;
  51typedef unsigned long pgd_t;
  52typedef unsigned long pgprot_t;
  53
  54#define pte_val(x)      (x)
  55#define pmd_val(x)      (x)
  56#define pgd_val(x)      (x)
  57#define pgprot_val(x)   (x)
  58
  59#define __pte(x)        (x)
  60#define __pgd(x)        (x)
  61#define __pgprot(x)     (x)
  62
  63#endif /* STRICT_MM_TYPECHECKS */
  64
  65typedef struct page *pgtable_t;
  66
  67#ifdef USE_48_BIT_KSEG
  68#define PAGE_OFFSET             0xffff800000000000UL
  69#else
  70#define PAGE_OFFSET             0xfffffc0000000000UL
  71#endif
  72
  73#else
  74
  75#ifdef USE_48_BIT_KSEG
  76#define PAGE_OFFSET             0xffff800000000000
  77#else
  78#define PAGE_OFFSET             0xfffffc0000000000
  79#endif
  80
  81#endif /* !__ASSEMBLY__ */
  82
  83#define __pa(x)                 ((unsigned long) (x) - PAGE_OFFSET)
  84#define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
  85#ifndef CONFIG_DISCONTIGMEM
  86#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  87
  88#define pfn_valid(pfn)          ((pfn) < max_mapnr)
  89#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  90#endif /* CONFIG_DISCONTIGMEM */
  91
  92#define VM_DATA_DEFAULT_FLAGS           (VM_READ | VM_WRITE | VM_EXEC | \
  93                                         VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  94
  95#include <asm-generic/memory_model.h>
  96#include <asm-generic/getorder.h>
  97
  98#endif /* _ALPHA_PAGE_H */
  99