--- src/hd/hd.c.orig	2012-08-02 17:13:27.557190312 +0900
+++ src/hd/hd.c	2012-08-02 17:14:33.370367535 +0900
@@ -3147,16 +3147,16 @@
     "mov %%edx,8(%%esi)\n\t"
     "pop %%ebx"
 #else
-    "push %%rbx\n\t"
+	"mov %%ebx,%%edi\n\t"
     "cpuid\n\t"
     "mov %%ebx,(%%rsi)\n\t"
     "mov %%ecx,4(%%rsi)\n\t"
     "mov %%edx,8(%%rsi)\n\t"
-    "pop %%rbx"
+    "mov %%edi,%%ebx\n\t"
 #endif
     : "=a" (u), "=c" (foo)
     : "a" (0x40000000), "c" (0), "S" (signature)
-    : "%edx"
+    : "%edx", "%edi"
   );
 
   signature[12] = 0;