1 #include <asm/paravirt.h>
2 #include <asm/asm-offsets.h>
3 #include <linux/stringify.h>
4
5 DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
6 DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
7 DEF_NATIVE(pv_irq_ops, restore_fl, "pushq %rdi; popfq");
8 DEF_NATIVE(pv_irq_ops, save_fl, "pushfq; popq %rax");
9 DEF_NATIVE(pv_cpu_ops, iret, "iretq");
10 DEF_NATIVE(pv_mmu_ops, read_cr2, "movq %cr2, %rax");
11 DEF_NATIVE(pv_mmu_ops, read_cr3, "movq %cr3, %rax");
12 DEF_NATIVE(pv_mmu_ops, write_cr3, "movq %rdi, %cr3");
13 DEF_NATIVE(pv_mmu_ops, flush_tlb_single, "invlpg (%rdi)");
14 DEF_NATIVE(pv_cpu_ops, clts, "clts");
15 DEF_NATIVE(pv_cpu_ops, wbinvd, "wbinvd");
16
17 /* the three commands give us more control to how to return from a syscall */
18 DEF_NATIVE(pv_cpu_ops, irq_enable_syscall_ret, "movq %gs:" __stringify(pda_oldrsp) ", %rsp; swapgs; sysretq;");
19 DEF_NATIVE(pv_cpu_ops, swapgs, "swapgs");
20
21 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
22 unsigned long addr, unsigned len)
23 {
24 const unsigned char *start, *end;
25 unsigned ret;
26
27 #define PATCH_SITE(ops, x) \
28 case PARAVIRT_PATCH(ops.x): \
29 start = start_##ops##_##x; \
30 end = end_##ops##_##x; \
31 goto patch_site
32 switch(type) {
33 PATCH_SITE(pv_irq_ops, restore_fl);
34 PATCH_SITE(pv_irq_ops, save_fl);
35 PATCH_SITE(pv_irq_ops, irq_enable);
36 PATCH_SITE(pv_irq_ops, irq_disable);
37 PATCH_SITE(pv_cpu_ops, iret);
38 PATCH_SITE(pv_cpu_ops, irq_enable_syscall_ret);
39 PATCH_SITE(pv_cpu_ops, swapgs);
40 PATCH_SITE(pv_mmu_ops, read_cr2);
41 PATCH_SITE(pv_mmu_ops, read_cr3);
42 PATCH_SITE(pv_mmu_ops, write_cr3);
43 PATCH_SITE(pv_cpu_ops, clts);
44 PATCH_SITE(pv_mmu_ops, flush_tlb_single);
45 PATCH_SITE(pv_cpu_ops, wbinvd);
46
47 patch_site:
48 ret = paravirt_patch_insns(ibuf, len, start, end);
49 break;
50
51 default:
52 ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
53 break;
54 }
55 #undef PATCH_SITE
56 return ret;
57 }
58
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