release/src-rt-6.x.4708/linux/linux-2.6.36/arch/x86/kernel/paravirt_patch_32.c

   1 #include <asm/paravirt.h>
   2
   3 DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
   4 DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
   5 DEF_NATIVE(pv_irq_ops, restore_fl, "push %eax; popf");
   6 DEF_NATIVE(pv_irq_ops, save_fl, "pushf; pop %eax");
   7 DEF_NATIVE(pv_cpu_ops, iret, "iret");
   8 DEF_NATIVE(pv_cpu_ops, irq_enable_sysexit, "sti; sysexit");
   9 DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
  10 DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
  11 DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
  12 DEF_NATIVE(pv_cpu_ops, clts, "clts");
  13 DEF_NATIVE(pv_cpu_ops, read_tsc, "rdtsc");
  14
  15 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
  16 {
  17         /* arg in %eax, return in %eax */
  18         return 0;
  19 }
  20
  21 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
  22 {
  23         /* arg in %edx:%eax, return in %edx:%eax */
  24         return 0;
  25 }
  26
  27 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
  28                       unsigned long addr, unsigned len)
  29 {
  30         const unsigned char *start, *end;
  31         unsigned ret;
  32
  33 #define PATCH_SITE(ops, x)                                      \
  34                 case PARAVIRT_PATCH(ops.x):                     \
  35                         start = start_##ops##_##x;              \
  36                         end = end_##ops##_##x;                  \
  37                         goto patch_site
  38         switch (type) {
  39                 PATCH_SITE(pv_irq_ops, irq_disable);
  40                 PATCH_SITE(pv_irq_ops, irq_enable);
  41                 PATCH_SITE(pv_irq_ops, restore_fl);
  42                 PATCH_SITE(pv_irq_ops, save_fl);
  43                 PATCH_SITE(pv_cpu_ops, iret);
  44                 PATCH_SITE(pv_cpu_ops, irq_enable_sysexit);
  45                 PATCH_SITE(pv_mmu_ops, read_cr2);
  46                 PATCH_SITE(pv_mmu_ops, read_cr3);
  47                 PATCH_SITE(pv_mmu_ops, write_cr3);
  48                 PATCH_SITE(pv_cpu_ops, clts);
  49                 PATCH_SITE(pv_cpu_ops, read_tsc);
  50
  51         patch_site:
  52                 ret = paravirt_patch_insns(ibuf, len, start, end);
  53                 break;
  54
  55         default:
  56                 ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
  57                 break;
  58         }
  59 #undef PATCH_SITE
  60         return ret;
  61 }