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 #define STACKFAULT_STACK 0
  24 #define DOUBLEFAULT_STACK 1
  25 #define NMI_STACK 0
  26 #define DEBUG_STACK 0
  27 #define MCE_STACK 0
  28 #define N_EXCEPTION_STACKS 1
  29
  30 #ifdef CONFIG_X86_PAE
  31 /* 44=32+12, the limit we can fit into an unsigned long pfn */
  32 #define __PHYSICAL_MASK_SHIFT   44
  33 #define __VIRTUAL_MASK_SHIFT    32
  34 #define PAGETABLE_LEVELS        3
  35
  36 #ifndef __ASSEMBLY__
  37 typedef u64     pteval_t;
  38 typedef u64     pmdval_t;
  39 typedef u64     pudval_t;
  40 typedef u64     pgdval_t;
  41 typedef u64     pgprotval_t;
  42 typedef u64     phys_addr_t;
  43
  44 typedef union {
  45         struct {
  46                 unsigned long pte_low, pte_high;
  47         };
  48         pteval_t pte;
  49 } pte_t;
  50 #endif  /* __ASSEMBLY__
  51  */
  52 #else  /* !CONFIG_X86_PAE */
  53 #define __PHYSICAL_MASK_SHIFT   32
  54 #define __VIRTUAL_MASK_SHIFT    32
  55 #define PAGETABLE_LEVELS        2
  56
  57 #ifndef __ASSEMBLY__
  58 typedef unsigned long   pteval_t;
  59 typedef unsigned long   pmdval_t;
  60 typedef unsigned long   pudval_t;
  61 typedef unsigned long   pgdval_t;
  62 typedef unsigned long   pgprotval_t;
  63 typedef unsigned long   phys_addr_t;
  64
  65 typedef union {
  66         pteval_t pte;
  67         pteval_t pte_low;
  68 } pte_t;
  69
  70 #endif  /* __ASSEMBLY__ */
  71 #endif  /* CONFIG_X86_PAE */
  72
  73 #ifndef __ASSEMBLY__
  74 typedef struct page *pgtable_t;
  75 #endif
  76
  77 #ifdef CONFIG_HUGETLB_PAGE
  78 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  79 #endif
  80
  81 #ifndef __ASSEMBLY__
  82 #define __phys_addr_nodebug(x)  ((x) - PAGE_OFFSET)
  83 #ifdef CONFIG_DEBUG_VIRTUAL
  84 extern unsigned long __phys_addr(unsigned long);
  85 #else
  86 #define __phys_addr(x)          __phys_addr_nodebug(x)
  87 #endif
  88 #define __phys_reloc_hide(x)    RELOC_HIDE((x), 0)
  89
  90 #ifdef CONFIG_FLATMEM
  91 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
  92 #endif /* CONFIG_FLATMEM */
  93
  94 extern int nx_enabled;
  95
  96 /*
  97  * This much address space is reserved for vmalloc() and iomap()
  98  * as well as fixmap mappings.
  99  */
 100 extern unsigned int __VMALLOC_RESERVE;
 101 extern int sysctl_legacy_va_layout;
 102
 103 extern void find_low_pfn_range(void);
 104 extern unsigned long init_memory_mapping(unsigned long start,
 105                                          unsigned long end);
 106 extern void initmem_init(unsigned long, unsigned long);
 107 extern void free_initmem(void);
 108 extern void setup_bootmem_allocator(void);
 109
 110
 111 #ifdef CONFIG_X86_USE_3DNOW
 112 #include <asm/mmx.h>
 113
 114 static inline void clear_page(void *page)
 115 {
 116         mmx_clear_page(page);
 117 }
 118
 119 static inline void copy_page(void *to, void *from)
 120 {
 121         mmx_copy_page(to, from);
 122 }
 123 #else  /* !CONFIG_X86_USE_3DNOW */
 124 #include <linux/string.h>
 125
 126 static inline void clear_page(void *page)
 127 {
 128         memset(page, 0, PAGE_SIZE);
 129 }
 130
 131 static inline void copy_page(void *to, void *from)
 132 {
 133         memcpy(to, from, PAGE_SIZE);
 134 }
 135 #endif  /* CONFIG_X86_3DNOW */
 136 #endif  /* !__ASSEMBLY__ */
 137
 138 #endif /* ASM_X86__PAGE_32_H */