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 native_patch(u8 type, u16 clobbers, void *ibuf,
  16                       unsigned long addr, unsigned len)
  17 {
  18         const unsigned char *start, *end;
  19         unsigned ret;
  20
  21 #define PATCH_SITE(ops, x)                                      \
  22                 case PARAVIRT_PATCH(ops.x):                     \
  23                         start = start_##ops##_##x;              \
  24                         end = end_##ops##_##x;                  \
  25                         goto patch_site
  26         switch (type) {
  27                 PATCH_SITE(pv_irq_ops, irq_disable);
  28                 PATCH_SITE(pv_irq_ops, irq_enable);
  29                 PATCH_SITE(pv_irq_ops, restore_fl);
  30                 PATCH_SITE(pv_irq_ops, save_fl);
  31                 PATCH_SITE(pv_cpu_ops, iret);
  32                 PATCH_SITE(pv_cpu_ops, irq_enable_sysexit);
  33                 PATCH_SITE(pv_mmu_ops, read_cr2);
  34                 PATCH_SITE(pv_mmu_ops, read_cr3);
  35                 PATCH_SITE(pv_mmu_ops, write_cr3);
  36                 PATCH_SITE(pv_cpu_ops, clts);
  37                 PATCH_SITE(pv_cpu_ops, read_tsc);
  38
  39         patch_site:
  40                 ret = paravirt_patch_insns(ibuf, len, start, end);
  41                 break;
  42
  43         default:
  44                 ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
  45                 break;
  46         }
  47 #undef PATCH_SITE
  48         return ret;
  49 }