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authorGlauber de Oliveira Costa <gcosta@redhat.com>2008-01-30 13:32:10 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:32:10 +0100
commit53fd13cff04ce27ff3e8d3eb7e5ad4f56b580f2f (patch)
tree3ccca4b41a17c4c34c41455f07ef0f422ba389d2 /arch/x86/kernel/paravirt_patch_64.c
parent2f485ef568372af4680c4e2f8490efb9f2523b05 (diff)
x86: patching functions on 64-bit
Like i386, x86_64 also need to include its own patching function. (Well, if you're not in a hurry, and don't care about speed, you don't really _need_ ;-)) So here they are. Not much different in essence from i386 Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/paravirt_patch_64.c')
-rw-r--r--arch/x86/kernel/paravirt_patch_64.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/x86/kernel/paravirt_patch_64.c b/arch/x86/kernel/paravirt_patch_64.c
new file mode 100644
index 000000000000..cbfc4f3069e3
--- /dev/null
+++ b/arch/x86/kernel/paravirt_patch_64.c
@@ -0,0 +1,56 @@
+#include <asm/paravirt.h>
+#include <asm/asm-offsets.h>
+
+DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
+DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
+DEF_NATIVE(pv_irq_ops, restore_fl, "pushq %rdi; popfq");
+DEF_NATIVE(pv_irq_ops, save_fl, "pushfq; popq %rax");
+DEF_NATIVE(pv_cpu_ops, iret, "iretq");
+DEF_NATIVE(pv_mmu_ops, read_cr2, "movq %cr2, %rax");
+DEF_NATIVE(pv_mmu_ops, read_cr3, "movq %cr3, %rax");
+DEF_NATIVE(pv_mmu_ops, write_cr3, "movq %rdi, %cr3");
+DEF_NATIVE(pv_mmu_ops, flush_tlb_single, "invlpg (%rdi)");
+DEF_NATIVE(pv_cpu_ops, clts, "clts");
+DEF_NATIVE(pv_cpu_ops, wbinvd, "wbinvd");
+
+/* the three commands give us more control to how to return from a syscall */
+DEF_NATIVE(pv_cpu_ops, irq_enable_syscall_ret, "movq %gs:" __stringify(pda_oldrsp) ", %rsp; swapgs; sysretq;");
+DEF_NATIVE(pv_cpu_ops, swapgs, "swapgs");
+
+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, restore_fl);
+ PATCH_SITE(pv_irq_ops, save_fl);
+ PATCH_SITE(pv_irq_ops, irq_enable);
+ PATCH_SITE(pv_irq_ops, irq_disable);
+ PATCH_SITE(pv_cpu_ops, iret);
+ PATCH_SITE(pv_cpu_ops, irq_enable_syscall_ret);
+ PATCH_SITE(pv_cpu_ops, swapgs);
+ 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_mmu_ops, flush_tlb_single);
+ PATCH_SITE(pv_cpu_ops, wbinvd);
+
+ 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;
+}