kernel/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
  14 #if defined(CONFIG_PARAVIRT_SPINLOCKS) && defined(CONFIG_QUEUED_SPINLOCKS)
  15 DEF_NATIVE(pv_lock_ops, queued_spin_unlock, "movb $0, (%eax)");
  16 #endif
  17
  18 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
  19 {
  20         /* arg in %eax, return in %eax */
  21         return 0;
  22 }
  23
  24 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
  25 {
  26         /* arg in %edx:%eax, return in %edx:%eax */
  27         return 0;
  28 }
  29
  30 extern bool pv_is_native_spin_unlock(void);
  31
  32 unsigned 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
  67 patch_site:
  68                 ret = paravirt_patch_insns(ibuf, len, start, end);
  69                 break;
  70         }
  71 #undef PATCH_SITE
  72         return ret;
  73 }