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@@ -0,0 +1,56 @@
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+#include <asm/paravirt.h>
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+#include <asm/asm-offsets.h>
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+
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+DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
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+DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
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+DEF_NATIVE(pv_irq_ops, restore_fl, "pushq %rdi; popfq");
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+DEF_NATIVE(pv_irq_ops, save_fl, "pushfq; popq %rax");
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+DEF_NATIVE(pv_cpu_ops, iret, "iretq");
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+DEF_NATIVE(pv_mmu_ops, read_cr2, "movq %cr2, %rax");
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+DEF_NATIVE(pv_mmu_ops, read_cr3, "movq %cr3, %rax");
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+DEF_NATIVE(pv_mmu_ops, write_cr3, "movq %rdi, %cr3");
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+DEF_NATIVE(pv_mmu_ops, flush_tlb_single, "invlpg (%rdi)");
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+DEF_NATIVE(pv_cpu_ops, clts, "clts");
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+DEF_NATIVE(pv_cpu_ops, wbinvd, "wbinvd");
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+
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+/* the three commands give us more control to how to return from a syscall */
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+DEF_NATIVE(pv_cpu_ops, irq_enable_syscall_ret, "movq %gs:" __stringify(pda_oldrsp) ", %rsp; swapgs; sysretq;");
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+DEF_NATIVE(pv_cpu_ops, swapgs, "swapgs");
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+
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+unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
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+ unsigned long addr, unsigned len)
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+{
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+ const unsigned char *start, *end;
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+ unsigned ret;
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+
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+#define PATCH_SITE(ops, x) \
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+ case PARAVIRT_PATCH(ops.x): \
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+ start = start_##ops##_##x; \
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+ end = end_##ops##_##x; \
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+ goto patch_site
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+ switch(type) {
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+ PATCH_SITE(pv_irq_ops, restore_fl);
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+ PATCH_SITE(pv_irq_ops, save_fl);
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+ PATCH_SITE(pv_irq_ops, irq_enable);
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+ PATCH_SITE(pv_irq_ops, irq_disable);
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+ PATCH_SITE(pv_cpu_ops, iret);
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+ PATCH_SITE(pv_cpu_ops, irq_enable_syscall_ret);
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+ PATCH_SITE(pv_cpu_ops, swapgs);
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+ PATCH_SITE(pv_mmu_ops, read_cr2);
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+ PATCH_SITE(pv_mmu_ops, read_cr3);
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+ PATCH_SITE(pv_mmu_ops, write_cr3);
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+ PATCH_SITE(pv_cpu_ops, clts);
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+ PATCH_SITE(pv_mmu_ops, flush_tlb_single);
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+ PATCH_SITE(pv_cpu_ops, wbinvd);
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+
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+ patch_site:
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+ ret = paravirt_patch_insns(ibuf, len, start, end);
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+ break;
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+
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+ default:
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+ ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
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+ break;
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+ }
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+#undef PATCH_SITE
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+ return ret;
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+}
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