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 #if defined(CONFIG_PARAVIRT_SPINLOCKS) && defined(CONFIG_QUEUED_SPINLOCKS)
  16 DEF_NATIVE(pv_lock_ops, queued_spin_unlock, "movb $0, (%eax)");
  17 #endif
  18
  19 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
  20 {
  21         /* arg in %eax, return in %eax */
  22         return 0;
  23 }
  24
  25 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
  26 {
  27         /* arg in %edx:%eax, return in %edx:%eax */
  28         return 0;
  29 }
  30
  31 extern bool pv_is_native_spin_unlock(void);
  32
  33 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
  34                       unsigned long addr, unsigned len)
  35 {
  36         const unsigned char *start, *end;
  37         unsigned ret;
  38
  39 #define PATCH_SITE(ops, x)                                      \
  40                 case PARAVIRT_PATCH(ops.x):                     \
  41                         start = start_##ops##_##x;              \
  42                         end = end_##ops##_##x;                  \
  43                         goto patch_site
  44         switch (type) {
  45                 PATCH_SITE(pv_irq_ops, irq_disable);
  46                 PATCH_SITE(pv_irq_ops, irq_enable);
  47                 PATCH_SITE(pv_irq_ops, restore_fl);
  48                 PATCH_SITE(pv_irq_ops, save_fl);
  49                 PATCH_SITE(pv_cpu_ops, iret);
  50                 PATCH_SITE(pv_cpu_ops, irq_enable_sysexit);
  51                 PATCH_SITE(pv_mmu_ops, read_cr2);
  52                 PATCH_SITE(pv_mmu_ops, read_cr3);
  53                 PATCH_SITE(pv_mmu_ops, write_cr3);
  54                 PATCH_SITE(pv_cpu_ops, clts);
  55                 PATCH_SITE(pv_cpu_ops, read_tsc);
  56 #if defined(CONFIG_PARAVIRT_SPINLOCKS) && defined(CONFIG_QUEUED_SPINLOCKS)
  57                 case PARAVIRT_PATCH(pv_lock_ops.queued_spin_unlock):
  58                         if (pv_is_native_spin_unlock()) {
  59                                 start = start_pv_lock_ops_queued_spin_unlock;
  60                                 end   = end_pv_lock_ops_queued_spin_unlock;
  61                                 goto patch_site;
  62                         }
  63 #endif
  64
  65         default:
  66                 ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
  67                 break;
  68
  69 patch_site:
  70                 ret = paravirt_patch_insns(ibuf, len, start, end);
  71                 break;
  72         }
  73 #undef PATCH_SITE
  74         return ret;
  75 }