cpuid: better parser for processor info

Signed-off-by: Ahmed Samy <f.fallen45@gmail.com>

ccan/cpuid/cpuid.c

@@ -29,6 +29,7 @@
 #include "cpuid.h"
 
 #include <string.h>
+#include <stdio.h>
 
 enum {
 	CPU_PROC_BRAND_STRING_INTERNAL0  		= 0x80000003,
@@ -309,10 +310,15 @@ void cpuid(cpuid_t info, uint32_t *buf)
 			buf[2] = ecx;
 			break;
 		case CPU_PROCINFO_AND_FEATUREBITS:
-			buf[0] = eax; 	/* The so called "signature" of the CPU.  */
-			buf[1] = edx; 	/* Feature flags #1.  */
-			buf[2] = ecx; 	/* Feature flags #2.  */
-			buf[3] = ebx; 	/* Additional feature information.  */
+			buf[0] = (eax & 0x0F);		/* Stepping  */
+			buf[1] = (eax >> 4)  & 0x0F; 	/* Model  */
+			buf[2] = (eax >> 8)  & 0x0F; 	/* Family  */
+			buf[3] = (eax >> 16) & 0x0F; 	/* Extended Model.  */
+			buf[4] = (eax >> 24) & 0x0F; 	/* Extended Family.  */
+
+			buf[5] = edx; 			/* Feature flags #1.  */
+			buf[6] = ecx; 			/* Feature flags #2.  */
+			buf[7] = ebx; 			/* Additional feature information.  */
 			break;
 		case CPU_CACHE_AND_TLBD_INFO:
 			buf[0] = eax;

ccan/cpuid/cpuid.h

@@ -173,16 +173,14 @@ uint32_t cpuid_highest_ext_func_supported(void);
  * 	Returns a string into buf.
  *
  * For CPU_PROCINFO_AND_FEATUREBITS:
- * 	buf[0]:
- * 		- 3:0 - Stepping
- * 		- 7:4 - Model
- * 		- 11:8 - Family
- * 		- 13:12 - Processor Type
- * 		- 19:16 - Extended Model
- * 		- 27:20 - Extended family
- * 	buf[1] and buf[2]:
+ * 	buf[0]: Stepping
+ * 	buf[1]: Model
+ * 	buf[2]: Family
+ * 	buf[3]: Extended Model
+ * 	buf[4]: Extended Family
+ * 	buf[5] and buf[6]:
  * 		Feature flags
- * 	buf[3]:
+ * 	buf[7]:
  * 		Additional feature information.
  *
  * For CPU_L1_CACHE_AND_TLB_IDS:

ccan/cpuid/test/run.c

@@ -18,6 +18,11 @@ int main(void)
 	cpuid(CPU_PROC_BRAND_STRING, (uint32_t *)buf);
 	printf ("Processor Brand: %s\n", buf);
 
+	uint32_t procinfo[8];
+	cpuid(CPU_PROCINFO_AND_FEATUREBITS, procinfo);
+	printf("Stepping: %d Model: 0x%X Family: %d extended model: %d extended family: %d\n",
+		procinfo[0], procinfo[1], procinfo[2], procinfo[3], procinfo[4]);
+
 	printf ("Highest extended function supported: %#010x\n", cpuid_highest_ext_func_supported());
 
 	uint32_t phys_virt[2];