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