LXR linux/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
  11unsigned 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}
  24EXPORT_SYMBOL(__phys_addr);
  25
  26bool __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}
  43EXPORT_SYMBOL(__virt_addr_valid);
  44
  45#else
  46
  47#ifdef CONFIG_DEBUG_VIRTUAL
  48unsigned 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}
  55EXPORT_SYMBOL(__phys_addr);
  56#endif
  57
  58bool __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}
  68EXPORT_SYMBOL(__virt_addr_valid);
  69
  70#endif  /* CONFIG_X86_64 */
  71