LXR linux/include/asm-i386/page.h

   1#ifndef _I386_PAGE_H
   2#define _I386_PAGE_H
   3
   4/* PAGE_SHIFT determines the page size */
   5#define PAGE_SHIFT      12
   6#define PAGE_SIZE       (1UL << PAGE_SHIFT)
   7#define PAGE_MASK       (~(PAGE_SIZE-1))
   8
   9#define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
  10#define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
  11
  12#ifdef __KERNEL__
  13#ifndef __ASSEMBLY__
  14
  15#include <linux/config.h>
  16
  17#ifdef CONFIG_X86_USE_3DNOW
  18
  19#include <asm/mmx.h>
  20
  21#define clear_page(page)        mmx_clear_page((void *)(page))
  22#define copy_page(to,from)      mmx_copy_page(to,from)
  23
  24#else
  25
  26/*
  27 *      On older X86 processors it's not a win to use MMX here it seems.
  28 *      Maybe the K6-III ?
  29 */
  30 
  31#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  32#define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  33
  34#endif
  35
  36#define clear_user_page(page, vaddr, pg)        clear_page(page)
  37#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  38
  39#define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
  40#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  41
  42/*
  43 * These are used to make use of C type-checking..
  44 */
  45extern int nx_enabled;
  46#ifdef CONFIG_X86_PAE
  47extern unsigned long long __supported_pte_mask;
  48typedef struct { unsigned long pte_low, pte_high; } pte_t;
  49typedef struct { unsigned long long pmd; } pmd_t;
  50typedef struct { unsigned long long pgd; } pgd_t;
  51typedef struct { unsigned long long pgprot; } pgprot_t;
  52#define pmd_val(x)      ((x).pmd)
  53#define pte_val(x)      ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  54#define __pmd(x) ((pmd_t) { (x) } )
  55#define HPAGE_SHIFT     21
  56#else
  57typedef struct { unsigned long pte_low; } pte_t;
  58typedef struct { unsigned long pgd; } pgd_t;
  59typedef struct { unsigned long pgprot; } pgprot_t;
  60#define boot_pte_t pte_t /* or would you rather have a typedef */
  61#define pte_val(x)      ((x).pte_low)
  62#define HPAGE_SHIFT     22
  63#endif
  64#define PTE_MASK        PAGE_MASK
  65
  66#ifdef CONFIG_HUGETLB_PAGE
  67#define HPAGE_SIZE      ((1UL) << HPAGE_SHIFT)
  68#define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  69#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  70#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  71#endif
  72
  73#define pgd_val(x)      ((x).pgd)
  74#define pgprot_val(x)   ((x).pgprot)
  75
  76#define __pte(x) ((pte_t) { (x) } )
  77#define __pgd(x) ((pgd_t) { (x) } )
  78#define __pgprot(x)     ((pgprot_t) { (x) } )
  79
  80#endif /* !__ASSEMBLY__ */
  81
  82/* to align the pointer to the (next) page boundary */
  83#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  84
  85/*
  86 * This handles the memory map.. We could make this a config
  87 * option, but too many people screw it up, and too few need
  88 * it.
  89 *
  90 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  91 * a virtual address space of one gigabyte, which limits the
  92 * amount of physical memory you can use to about 950MB. 
  93 *
  94 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
  95 * and CONFIG_HIGHMEM64G options in the kernel configuration.
  96 */
  97
  98#ifndef __ASSEMBLY__
  99
 100/*
 101 * This much address space is reserved for vmalloc() and iomap()
 102 * as well as fixmap mappings.
 103 */
 104extern unsigned int __VMALLOC_RESERVE;
 105
 106/* Pure 2^n version of get_order */
 107static __inline__ int get_order(unsigned long size)
 108{
 109        int order;
 110
 111        size = (size-1) >> (PAGE_SHIFT-1);
 112        order = -1;
 113        do {
 114                size >>= 1;
 115                order++;
 116        } while (size);
 117        return order;
 118}
 119
 120extern int sysctl_legacy_va_layout;
 121
 122#endif /* __ASSEMBLY__ */
 123
 124#ifdef __ASSEMBLY__
 125#define __PAGE_OFFSET           (0xC0000000)
 126#else
 127#define __PAGE_OFFSET           (0xC0000000UL)
 128#endif
 129
 130
 131#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 132#define VMALLOC_RESERVE         ((unsigned long)__VMALLOC_RESERVE)
 133#define MAXMEM                  (-__PAGE_OFFSET-__VMALLOC_RESERVE)
 134#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 135#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 136#define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 137#ifndef CONFIG_DISCONTIGMEM
 138#define pfn_to_page(pfn)        (mem_map + (pfn))
 139#define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 140#define pfn_valid(pfn)          ((pfn) < max_mapnr)
 141#endif /* !CONFIG_DISCONTIGMEM */
 142#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 143
 144#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 145
 146#define VM_DATA_DEFAULT_FLAGS \
 147        (VM_READ | VM_WRITE | \
 148        ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
 149                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 150
 151#endif /* __KERNEL__ */
 152
 153#endif /* _I386_PAGE_H */
 154