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_4KSTACKS
  17 #define THREAD_ORDER    0
  18 #else
  19 #define THREAD_ORDER    1
  20 #endif
  21 #define THREAD_SIZE     (PAGE_SIZE << THREAD_ORDER)
  22
  23
  24 #ifdef CONFIG_X86_PAE
  25 /* 44=32+12, the limit we can fit into an unsigned long pfn */
  26 #define __PHYSICAL_MASK_SHIFT   44
  27 #define __VIRTUAL_MASK_SHIFT    32
  28 #define PAGETABLE_LEVELS        3
  29
  30 #ifndef __ASSEMBLY__
  31 typedef u64     pteval_t;
  32 typedef u64     pmdval_t;
  33 typedef u64     pudval_t;
  34 typedef u64     pgdval_t;
  35 typedef u64     pgprotval_t;
  36 typedef u64     phys_addr_t;
  37
  38 typedef union {
  39         struct {
  40                 unsigned long pte_low, pte_high;
  41         };
  42         pteval_t pte;
  43 } pte_t;
  44 #endif  /* __ASSEMBLY__
  45  */
  46 #else  /* !CONFIG_X86_PAE */
  47 #define __PHYSICAL_MASK_SHIFT   32
  48 #define __VIRTUAL_MASK_SHIFT    32
  49 #define PAGETABLE_LEVELS        2
  50
  51 #ifndef __ASSEMBLY__
  52 typedef unsigned long   pteval_t;
  53 typedef unsigned long   pmdval_t;
  54 typedef unsigned long   pudval_t;
  55 typedef unsigned long   pgdval_t;
  56 typedef unsigned long   pgprotval_t;
  57 typedef unsigned long   phys_addr_t;
  58
  59 typedef union {
  60         pteval_t pte;
  61         pteval_t pte_low;
  62 } pte_t;
  63
  64 #endif  /* __ASSEMBLY__ */
  65 #endif  /* CONFIG_X86_PAE */
  66
  67 #ifndef __ASSEMBLY__
  68 typedef struct page *pgtable_t;
  69 #endif
  70
  71 #ifdef CONFIG_HUGETLB_PAGE
  72 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  73 #endif
  74
  75 #ifndef __ASSEMBLY__
  76 #define __phys_addr(x)          ((x) - PAGE_OFFSET)
  77 #define __phys_reloc_hide(x)    RELOC_HIDE((x), 0)
  78
  79 #ifdef CONFIG_FLATMEM
  80 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
  81 #endif /* CONFIG_FLATMEM */
  82
  83 extern int nx_enabled;
  84
  85 /*
  86  * This much address space is reserved for vmalloc() and iomap()
  87  * as well as fixmap mappings.
  88  */
  89 extern unsigned int __VMALLOC_RESERVE;
  90 extern int sysctl_legacy_va_layout;
  91
  92 #define VMALLOC_RESERVE         ((unsigned long)__VMALLOC_RESERVE)
  93 #define MAXMEM                  (-__PAGE_OFFSET - __VMALLOC_RESERVE)
  94
  95 extern void find_low_pfn_range(void);
  96 extern unsigned long init_memory_mapping(unsigned long start,
  97                                          unsigned long end);
  98 extern void initmem_init(unsigned long, unsigned long);
  99 extern void setup_bootmem_allocator(void);
 100
 101
 102 #ifdef CONFIG_X86_USE_3DNOW
 103 #include <asm/mmx.h>
 104
 105 static inline void clear_page(void *page)
 106 {
 107         mmx_clear_page(page);
 108 }
 109
 110 static inline void copy_page(void *to, void *from)
 111 {
 112         mmx_copy_page(to, from);
 113 }
 114 #else  /* !CONFIG_X86_USE_3DNOW */
 115 #include <linux/string.h>
 116
 117 static inline void clear_page(void *page)
 118 {
 119         memset(page, 0, PAGE_SIZE);
 120 }
 121
 122 static inline void copy_page(void *to, void *from)
 123 {
 124         memcpy(to, from, PAGE_SIZE);
 125 }
 126 #endif  /* CONFIG_X86_3DNOW */
 127 #endif  /* !__ASSEMBLY__ */
 128
 129 #endif /* _ASM_X86_PAGE_32_H */