root/arch/x86/kernel/paravirt_patch_32.c

DEFINITIONS

1. native_patch

#include <asm/paravirt.h>

DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
DEF_NATIVE(pv_irq_ops, restore_fl, "push %eax; popf");
DEF_NATIVE(pv_irq_ops, save_fl, "pushf; pop %eax");
DEF_NATIVE(pv_cpu_ops, iret, "iret");
DEF_NATIVE(pv_cpu_ops, irq_enable_sysexit, "sti; sysexit");
DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
DEF_NATIVE(pv_cpu_ops, clts, "clts");
DEF_NATIVE(pv_cpu_ops, read_tsc, "rdtsc");

unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
                      unsigned long addr, unsigned len)
{
        const unsigned char *start, *end;
        unsigned ret;

#define PATCH_SITE(ops, x)                                      \
                case PARAVIRT_PATCH(ops.x):                     \
                        start = start_##ops##_##x;              \
                        end = end_##ops##_##x;                  \
                        goto patch_site
        switch (type) {
                PATCH_SITE(pv_irq_ops, irq_disable);
                PATCH_SITE(pv_irq_ops, irq_enable);
                PATCH_SITE(pv_irq_ops, restore_fl);
                PATCH_SITE(pv_irq_ops, save_fl);
                PATCH_SITE(pv_cpu_ops, iret);
                PATCH_SITE(pv_cpu_ops, irq_enable_sysexit);
                PATCH_SITE(pv_mmu_ops, read_cr2);
                PATCH_SITE(pv_mmu_ops, read_cr3);
                PATCH_SITE(pv_mmu_ops, write_cr3);
                PATCH_SITE(pv_cpu_ops, clts);
                PATCH_SITE(pv_cpu_ops, read_tsc);

        patch_site:
                ret = paravirt_patch_insns(ibuf, len, start, end);
                break;

        default:
                ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
                break;
        }
#undef PATCH_SITE
        return ret;
}