diff --git a/sys/amd64/include/cpufunc.h b/sys/amd64/include/cpufunc.h
index 9a4c82275a9..e52c55dc80f 100644
--- a/sys/amd64/include/cpufunc.h
+++ b/sys/amd64/include/cpufunc.h
@@ -99,14 +99,6 @@ disable_intr(void)
 	__asm __volatile("cli" : : : "memory");
 }
 
-static __inline void
-do_cpuid(u_int ax, u_int *p)
-{
-	__asm __volatile("cpuid"
-	    : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
-	    :  "0" (ax));
-}
-
 static __inline void
 cpuid_count(u_int ax, u_int cx, u_int *p)
 {
@@ -115,6 +107,12 @@ cpuid_count(u_int ax, u_int cx, u_int *p)
 	    :  "0" (ax), "c" (cx));
 }
 
+static __inline void
+do_cpuid(u_int ax, u_int *p)
+{
+	cpuid_count(ax, 0, p);
+}
+
 static __inline void
 enable_intr(void)
 {
diff --git a/sys/i386/include/cpufunc.h b/sys/i386/include/cpufunc.h
index b200588b073..5ee516656d7 100644
--- a/sys/i386/include/cpufunc.h
+++ b/sys/i386/include/cpufunc.h
@@ -91,14 +91,6 @@ disable_intr(void)
 }
 
 #ifdef _KERNEL
-static __inline void
-do_cpuid(u_int ax, u_int *p)
-{
-	__asm __volatile("cpuid"
-	    : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
-	    :  "0" (ax));
-}
-
 static __inline void
 cpuid_count(u_int ax, u_int cx, u_int *p)
 {
@@ -107,18 +99,6 @@ cpuid_count(u_int ax, u_int cx, u_int *p)
 	    :  "0" (ax), "c" (cx));
 }
 #else
-static __inline void
-do_cpuid(u_int ax, u_int *p)
-{
-	__asm __volatile(
-	    "pushl\t%%ebx\n\t"
-	    "cpuid\n\t"
-	    "movl\t%%ebx,%1\n\t"
-	    "popl\t%%ebx"
-	    : "=a" (p[0]), "=DS" (p[1]), "=c" (p[2]), "=d" (p[3])
-	    :  "0" (ax));
-}
-
 static __inline void
 cpuid_count(u_int ax, u_int cx, u_int *p)
 {
@@ -132,6 +112,12 @@ cpuid_count(u_int ax, u_int cx, u_int *p)
 }
 #endif
 
+static __inline void
+do_cpuid(u_int ax, u_int *p)
+{
+	cpuid_count(ax, 0, p);
+}
+
 static __inline void
 enable_intr(void)
 {