include/asm-x86_64/page.h

   1 #ifndef _X86_64_PAGE_H
   2 #define _X86_64_PAGE_H
   3
   4 #include <linux/config.h>
   5
   6 /* PAGE_SHIFT determines the page size */
   7 #define PAGE_SHIFT      12
   8 #ifdef __ASSEMBLY__
   9 #define PAGE_SIZE       (0x1 << PAGE_SHIFT)
  10 #else
  11 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  12 #endif
  13 #define PAGE_MASK       (~(PAGE_SIZE-1))
  14 #define PHYSICAL_PAGE_MASK      (~(PAGE_SIZE-1) & (__PHYSICAL_MASK << PAGE_SHIFT))
  15
  16 #define THREAD_ORDER 1
  17 #ifdef __ASSEMBLY__
  18 #define THREAD_SIZE  (1 << (PAGE_SHIFT + THREAD_ORDER))
  19 #else
  20 #define THREAD_SIZE  (1UL << (PAGE_SHIFT + THREAD_ORDER))
  21 #endif
  22 #define CURRENT_MASK (~(THREAD_SIZE-1))
  23
  24 #define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
  25 #define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
  26
  27 #define HPAGE_SHIFT PMD_SHIFT
  28 #define HPAGE_SIZE      ((1UL) << HPAGE_SHIFT)
  29 #define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  30 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  31
  32 #ifdef __KERNEL__
  33 #ifndef __ASSEMBLY__
  34
  35 void clear_page(void *);
  36 void copy_page(void *, void *);
  37
  38 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  39 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  40
  41 /*
  42  * These are used to make use of C type-checking..
  43  */
  44 typedef struct { unsigned long pte; } pte_t;
  45 typedef struct { unsigned long pmd; } pmd_t;
  46 typedef struct { unsigned long pgd; } pgd_t;
  47 typedef struct { unsigned long pml4; } pml4_t;
  48 #define PTE_MASK        PHYSICAL_PAGE_MASK
  49
  50 typedef struct { unsigned long pgprot; } pgprot_t;
  51
  52 #define pte_val(x)      ((x).pte)
  53 #define pmd_val(x)      ((x).pmd)
  54 #define pgd_val(x)      ((x).pgd)
  55 #define pml4_val(x)     ((x).pml4)
  56 #define pgprot_val(x)   ((x).pgprot)
  57
  58 #define __pte(x) ((pte_t) { (x) } )
  59 #define __pmd(x) ((pmd_t) { (x) } )
  60 #define __pgd(x) ((pgd_t) { (x) } )
  61 #define __pml4(x) ((pml4_t) { (x) } )
  62 #define __pgprot(x)     ((pgprot_t) { (x) } )
  63
  64 extern unsigned long vm_stack_flags, vm_stack_flags32;
  65 extern unsigned long vm_data_default_flags, vm_data_default_flags32;
  66 extern unsigned long vm_force_exec32;
  67
  68 #define __START_KERNEL          0xffffffff80100000UL
  69 #define __START_KERNEL_map      0xffffffff80000000UL
  70 #define __PAGE_OFFSET           0x0000010000000000UL    /* 1 << 40 */
  71
  72 #else
  73 #define __START_KERNEL          0xffffffff80100000
  74 #define __START_KERNEL_map      0xffffffff80000000
  75 #define __PAGE_OFFSET           0x0000010000000000      /* 1 << 40 */
  76 #endif /* !__ASSEMBLY__ */
  77
  78 /* to align the pointer to the (next) page boundary */
  79 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  80
  81 /* See Documentation/x86_64/mm.txt for a description of the memory map. */
  82 #define __PHYSICAL_MASK_SHIFT   40
  83 #define __PHYSICAL_MASK         ((1UL << __PHYSICAL_MASK_SHIFT) - 1)
  84 #define __VIRTUAL_MASK_SHIFT    48
  85 #define __VIRTUAL_MASK          ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
  86
  87 #define KERNEL_TEXT_SIZE  (40UL*1024*1024)
  88 #define KERNEL_TEXT_START 0xffffffff80000000UL
  89
  90 #ifndef __ASSEMBLY__
  91
  92 #include <asm/bug.h>
  93
  94 /* Pure 2^n version of get_order */
  95 extern __inline__ int get_order(unsigned long size)
  96 {
  97         int order;
  98
  99         size = (size-1) >> (PAGE_SHIFT-1);
 100         order = -1;
 101         do {
 102                 size >>= 1;
 103                 order++;
 104         } while (size);
 105         return order;
 106 }
 107
 108 #endif /* __ASSEMBLY__ */
 109
 110 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 111
 112 /* Note: __pa(&symbol_visible_to_c) should be always replaced with __pa_symbol.
 113    Otherwise you risk miscompilation. */
 114 #define __pa(x)                 (((unsigned long)(x)>=__START_KERNEL_map)?(unsigned long)(x) - (unsigned long)__START_KERNEL_map:(unsigned long)(x) - PAGE_OFFSET)
 115 /* __pa_symbol should be used for C visible symbols.
 116    This seems to be the official gcc blessed way to do such arithmetic. */
 117 #define __pa_symbol(x)          \
 118         ({unsigned long v;  \
 119           asm("" : "=r" (v) : "0" (x)); \
 120           __pa(v); })
 121
 122 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 123 #ifndef CONFIG_DISCONTIGMEM
 124 #define pfn_to_page(pfn)        (mem_map + (pfn))
 125 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 126 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 127 #endif
 128
 129 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 130 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 131 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 132
 133 #define __VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
 134                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 135 #define __VM_STACK_FLAGS        (VM_GROWSDOWN | VM_READ | VM_WRITE | VM_EXEC | \
 136                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 137
 138 #define VM_DATA_DEFAULT_FLAGS \
 139         (test_thread_flag(TIF_IA32) ? vm_data_default_flags32 : \
 140           vm_data_default_flags)
 141
 142 #define VM_STACK_DEFAULT_FLAGS \
 143         (test_thread_flag(TIF_IA32) ? vm_stack_flags32 : vm_stack_flags)
 144
 145 #define CONFIG_ARCH_GATE_AREA 1
 146
 147 #ifndef __ASSEMBLY__
 148 struct task_struct;
 149 struct vm_area_struct *get_gate_vma(struct task_struct *tsk);
 150 int in_gate_area(struct task_struct *task, unsigned long addr);
 151 #endif
 152
 153 #endif /* __KERNEL__ */
 154
 155 #endif /* _X86_64_PAGE_H */