include/asm-x86/page_32.h

   1 #ifndef _ASM_X86_PAGE_32_H
   2 #define _ASM_X86_PAGE_32_H
   3
   4 /*
   5  * This handles the memory map.
   6  *
   7  * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
   8  * a virtual address space of one gigabyte, which limits the
   9  * amount of physical memory you can use to about 950MB.
  10  *
  11  * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
  12  * and CONFIG_HIGHMEM64G options in the kernel configuration.
  13  */
  14 #define __PAGE_OFFSET           _AC(CONFIG_PAGE_OFFSET, UL)
  15
  16 #ifdef CONFIG_X86_PAE
  17 /* 44=32+12, the limit we can fit into an unsigned long pfn */
  18 #define __PHYSICAL_MASK_SHIFT   44
  19 #define __VIRTUAL_MASK_SHIFT    32
  20 #define PAGETABLE_LEVELS        3
  21
  22 #ifndef __ASSEMBLY__
  23 typedef u64     pteval_t;
  24 typedef u64     pmdval_t;
  25 typedef u64     pudval_t;
  26 typedef u64     pgdval_t;
  27 typedef u64     pgprotval_t;
  28 typedef u64     phys_addr_t;
  29
  30 typedef union {
  31         struct {
  32                 unsigned long pte_low, pte_high;
  33         };
  34         pteval_t pte;
  35 } pte_t;
  36 #endif  /* __ASSEMBLY__
  37  */
  38 #else  /* !CONFIG_X86_PAE */
  39 #define __PHYSICAL_MASK_SHIFT   32
  40 #define __VIRTUAL_MASK_SHIFT    32
  41 #define PAGETABLE_LEVELS        2
  42
  43 #ifndef __ASSEMBLY__
  44 typedef unsigned long   pteval_t;
  45 typedef unsigned long   pmdval_t;
  46 typedef unsigned long   pudval_t;
  47 typedef unsigned long   pgdval_t;
  48 typedef unsigned long   pgprotval_t;
  49 typedef unsigned long   phys_addr_t;
  50
  51 typedef union {
  52         pteval_t pte;
  53         pteval_t pte_low;
  54 } pte_t;
  55
  56 #endif  /* __ASSEMBLY__ */
  57 #endif  /* CONFIG_X86_PAE */
  58
  59 #ifndef __ASSEMBLY__
  60 typedef struct page *pgtable_t;
  61 #endif
  62
  63 #ifdef CONFIG_HUGETLB_PAGE
  64 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  65 #endif
  66
  67 #ifndef __ASSEMBLY__
  68 #define __phys_addr(x)          ((x) - PAGE_OFFSET)
  69 #define __phys_reloc_hide(x)    RELOC_HIDE((x), 0)
  70
  71 #ifdef CONFIG_FLATMEM
  72 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
  73 #endif /* CONFIG_FLATMEM */
  74
  75 extern int nx_enabled;
  76
  77 /*
  78  * This much address space is reserved for vmalloc() and iomap()
  79  * as well as fixmap mappings.
  80  */
  81 extern unsigned int __VMALLOC_RESERVE;
  82 extern int sysctl_legacy_va_layout;
  83
  84 #define VMALLOC_RESERVE         ((unsigned long)__VMALLOC_RESERVE)
  85 #define MAXMEM                  (-__PAGE_OFFSET - __VMALLOC_RESERVE)
  86
  87 #ifdef CONFIG_X86_USE_3DNOW
  88 #include <asm/mmx.h>
  89
  90 static inline void clear_page(void *page)
  91 {
  92         mmx_clear_page(page);
  93 }
  94
  95 static inline void copy_page(void *to, void *from)
  96 {
  97         mmx_copy_page(to, from);
  98 }
  99 #else  /* !CONFIG_X86_USE_3DNOW */
 100 #include <linux/string.h>
 101
 102 static inline void clear_page(void *page)
 103 {
 104         memset(page, 0, PAGE_SIZE);
 105 }
 106
 107 static inline void copy_page(void *to, void *from)
 108 {
 109         memcpy(to, from, PAGE_SIZE);
 110 }
 111 #endif  /* CONFIG_X86_3DNOW */
 112 #endif  /* !__ASSEMBLY__ */
 113
 114 #endif /* _ASM_X86_PAGE_32_H */