arch/x86/mm/physaddr.c

   1 #include <linux/mmdebug.h>
   2 #include <linux/module.h>
   3 #include <linux/mm.h>
   4
   5 #include <asm/page.h>
   6
   7 #include "physaddr.h"
   8
   9 #ifdef CONFIG_X86_64
  10
  11 unsigned long __phys_addr(unsigned long x)
  12 {
  13         if (x >= __START_KERNEL_map) {
  14                 x -= __START_KERNEL_map;
  15                 VIRTUAL_BUG_ON(x >= KERNEL_IMAGE_SIZE);
  16                 x += phys_base;
  17         } else {
  18                 VIRTUAL_BUG_ON(x < PAGE_OFFSET);
  19                 x -= PAGE_OFFSET;
  20                 VIRTUAL_BUG_ON(!phys_addr_valid(x));
  21         }
  22         return x;
  23 }
  24 EXPORT_SYMBOL(__phys_addr);
  25
  26 bool __virt_addr_valid(unsigned long x)
  27 {
  28         if (x >= __START_KERNEL_map) {
  29                 x -= __START_KERNEL_map;
  30                 if (x >= KERNEL_IMAGE_SIZE)
  31                         return false;
  32                 x += phys_base;
  33         } else {
  34                 if (x < PAGE_OFFSET)
  35                         return false;
  36                 x -= PAGE_OFFSET;
  37                 if (!phys_addr_valid(x))
  38                         return false;
  39         }
  40
  41         return pfn_valid(x >> PAGE_SHIFT);
  42 }
  43 EXPORT_SYMBOL(__virt_addr_valid);
  44
  45 #else
  46
  47 #ifdef CONFIG_DEBUG_VIRTUAL
  48 unsigned long __phys_addr(unsigned long x)
  49 {
  50         /* VMALLOC_* aren't constants  */
  51         VIRTUAL_BUG_ON(x < PAGE_OFFSET);
  52         VIRTUAL_BUG_ON(__vmalloc_start_set && is_vmalloc_addr((void *) x));
  53         return x - PAGE_OFFSET;
  54 }
  55 EXPORT_SYMBOL(__phys_addr);
  56 #endif
  57
  58 bool __virt_addr_valid(unsigned long x)
  59 {
  60         if (x < PAGE_OFFSET)
  61                 return false;
  62         if (__vmalloc_start_set && is_vmalloc_addr((void *) x))
  63                 return false;
  64         if (x >= FIXADDR_START)
  65                 return false;
  66         return pfn_valid((x - PAGE_OFFSET) >> PAGE_SHIFT);
  67 }
  68 EXPORT_SYMBOL(__virt_addr_valid);
  69
  70 #endif  /* CONFIG_X86_64 */