LXR linux/arch/x86/kernel/paravirt_patch

   1#include <asm/paravirt.h>
   2
   3DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
   4DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
   5DEF_NATIVE(pv_irq_ops, restore_fl, "push %eax; popf");
   6DEF_NATIVE(pv_irq_ops, save_fl, "pushf; pop %eax");
   7DEF_NATIVE(pv_cpu_ops, iret, "iret");
   8DEF_NATIVE(pv_cpu_ops, irq_enable_sysexit, "sti; sysexit");
   9DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
  10DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
  11DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
  12DEF_NATIVE(pv_cpu_ops, clts, "clts");
  13DEF_NATIVE(pv_cpu_ops, read_tsc, "rdtsc");
  14
  15unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
  16{
  17        /* arg in %eax, return in %eax */
  18        return 0;
  19}
  20
  21unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
  22{
  23        /* arg in %edx:%eax, return in %edx:%eax */
  24        return 0;
  25}
  26
  27unsigned 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}
  62