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
paravirt_patch_ident_32(void * insnbuf,unsigned len)18 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
19 {
20 /* arg in %eax, return in %eax */
21 return 0;
22 }
23
paravirt_patch_ident_64(void * insnbuf,unsigned len)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
native_patch(u8 type,u16 clobbers,void * ibuf,unsigned long addr,unsigned len)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 }
74