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");
  13
  14#if defined(CONFIG_PARAVIRT_SPINLOCKS) && defined(CONFIG_QUEUED_SPINLOCKS)
  15DEF_NATIVE(pv_lock_ops, queued_spin_unlock, "movb $0, (%eax)");
  16#endif
  17
  18unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
  19{
  20        /* arg in %eax, return in %eax */
  21        return 0;
  22}
  23
  24unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
  25{
  26        /* arg in %edx:%eax, return in %edx:%eax */
  27        return 0;
  28}
  29
  30extern bool pv_is_native_spin_unlock(void);
  31
  32unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
  33                      unsigned long addr, unsigned len)
  34{
  35        const unsigned char *start, *end;
  36        unsigned ret;
  37
  38#define PATCH_SITE(ops, x)                                      \
  39                case PARAVIRT_PATCH(ops.x):                     \
  40                        start = start_##ops##_##x;              \
  41                        end = end_##ops##_##x;                  \
  42                        goto patch_site
  43        switch (type) {
  44                PATCH_SITE(pv_irq_ops, irq_disable);
  45                PATCH_SITE(pv_irq_ops, irq_enable);
  46                PATCH_SITE(pv_irq_ops, restore_fl);
  47                PATCH_SITE(pv_irq_ops, save_fl);
  48                PATCH_SITE(pv_cpu_ops, iret);
  49                PATCH_SITE(pv_cpu_ops, irq_enable_sysexit);
  50                PATCH_SITE(pv_mmu_ops, read_cr2);
  51                PATCH_SITE(pv_mmu_ops, read_cr3);
  52                PATCH_SITE(pv_mmu_ops, write_cr3);
  53                PATCH_SITE(pv_cpu_ops, clts);
  54#if defined(CONFIG_PARAVIRT_SPINLOCKS) && defined(CONFIG_QUEUED_SPINLOCKS)
  55                case PARAVIRT_PATCH(pv_lock_ops.queued_spin_unlock):
  56                        if (pv_is_native_spin_unlock()) {
  57                                start = start_pv_lock_ops_queued_spin_unlock;
  58                                end   = end_pv_lock_ops_queued_spin_unlock;
  59                                goto patch_site;
  60                        }
  61#endif
  62
  63        default:
  64                ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
  65                break;
  66
  67patch_site:
  68                ret = paravirt_patch_insns(ibuf, len, start, end);
  69                break;
  70        }
  71#undef PATCH_SITE
  72        return ret;
  73}
  74