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 #ifdef CONFIG_XEN
  12 #define phys_base 0
  13 #endif
  14
  15 unsigned long __phys_addr(unsigned long x)
  16 {
  17         if (x >= __START_KERNEL_map) {
  18                 x -= __START_KERNEL_map;
  19                 VIRTUAL_BUG_ON(x >= KERNEL_IMAGE_SIZE);
  20                 x += phys_base;
  21         } else {
  22                 VIRTUAL_BUG_ON(x < PAGE_OFFSET);
  23                 x -= PAGE_OFFSET;
  24                 VIRTUAL_BUG_ON(!phys_addr_valid(x));
  25         }
  26         return x;
  27 }
  28 EXPORT_SYMBOL(__phys_addr);
  29
  30 bool __virt_addr_valid(unsigned long x)
  31 {
  32         if (x >= __START_KERNEL_map) {
  33                 x -= __START_KERNEL_map;
  34                 if (x >= KERNEL_IMAGE_SIZE)
  35                         return false;
  36                 x += phys_base;
  37         } else {
  38                 if (x < PAGE_OFFSET)
  39                         return false;
  40                 x -= PAGE_OFFSET;
  41                 if (!phys_addr_valid(x))
  42                         return false;
  43         }
  44
  45         return pfn_valid(x >> PAGE_SHIFT);
  46 }
  47 EXPORT_SYMBOL(__virt_addr_valid);
  48
  49 #else
  50
  51 #ifdef CONFIG_DEBUG_VIRTUAL
  52 unsigned long __phys_addr(unsigned long x)
  53 {
  54         /* VMALLOC_* aren't constants  */
  55         VIRTUAL_BUG_ON(x < PAGE_OFFSET);
  56         VIRTUAL_BUG_ON(__vmalloc_start_set && is_vmalloc_addr((void *) x));
  57         return x - PAGE_OFFSET;
  58 }
  59 EXPORT_SYMBOL(__phys_addr);
  60 #endif
  61
  62 bool __virt_addr_valid(unsigned long x)
  63 {
  64         if (x < PAGE_OFFSET)
  65                 return false;
  66         if (__vmalloc_start_set && is_vmalloc_addr((void *) x))
  67                 return false;
  68         if (x >= FIXADDR_START)
  69                 return false;
  70         return pfn_valid((x - PAGE_OFFSET) >> PAGE_SHIFT);
  71 }
  72 EXPORT_SYMBOL(__virt_addr_valid);
  73
  74 #endif  /* CONFIG_X86_64 */