From: H.J. Lu <hjl.tools@gmail.com>
Date: Thu, 26 Jul 2018 17:49:19 +0000 (-0700)
Subject: x86: Populate COMMON_CPUID_INDEX_80000001 for Intel CPUs [BZ #23459]
X-Git-Tag: glibc-2.28~23
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=be525a69a66;p=thirdparty%2Fglibc.git

x86: Populate COMMON_CPUID_INDEX_80000001 for Intel CPUs [BZ #23459]

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

	[BZ #23459]
	* sysdeps/x86/cpu-features.c (get_extended_indices): New
	function.
	(init_cpu_features): Call get_extended_indices for both Intel
	and AMD CPUs.
	* sysdeps/x86/cpu-features.h (COMMON_CPUID_INDEX_80000001):
	Remove "for AMD" comment.
---

diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index 8108256c427..ea0b64fdb96 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -42,6 +42,20 @@ extern void TUNABLE_CALLBACK (set_x86_shstk) (tunable_val_t *)
 # include <cet-tunables.h>
 #endif
 
+static void
+get_extended_indices (struct cpu_features *cpu_features)
+{
+  unsigned int eax, ebx, ecx, edx;
+  __cpuid (0x80000000, eax, ebx, ecx, edx);
+  if (eax >= 0x80000001)
+    __cpuid (0x80000001,
+	     cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].eax,
+	     cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].ebx,
+	     cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].ecx,
+	     cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].edx);
+
+}
+
 static void
 get_common_indeces (struct cpu_features *cpu_features,
 		    unsigned int *family, unsigned int *model,
@@ -224,6 +238,8 @@ init_cpu_features (struct cpu_features *cpu_features)
       get_common_indeces (cpu_features, &family, &model, &extended_model,
 			  &stepping);
 
+      get_extended_indices (cpu_features);
+
       if (family == 0x06)
 	{
 	  model += extended_model;
@@ -338,16 +354,9 @@ init_cpu_features (struct cpu_features *cpu_features)
       get_common_indeces (cpu_features, &family, &model, &extended_model,
 			  &stepping);
 
-      ecx = cpu_features->cpuid[COMMON_CPUID_INDEX_1].ecx;
+      get_extended_indices (cpu_features);
 
-      unsigned int eax;
-      __cpuid (0x80000000, eax, ebx, ecx, edx);
-      if (eax >= 0x80000001)
-	__cpuid (0x80000001,
-		 cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].eax,
-		 cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].ebx,
-		 cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].ecx,
-		 cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].edx);
+      ecx = cpu_features->cpuid[COMMON_CPUID_INDEX_1].ecx;
 
       if (HAS_ARCH_FEATURE (AVX_Usable))
 	{
diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h
index 3807a9d6110..347a4b118d0 100644
--- a/sysdeps/x86/cpu-features.h
+++ b/sysdeps/x86/cpu-features.h
@@ -108,7 +108,7 @@ enum
   {
     COMMON_CPUID_INDEX_1 = 0,
     COMMON_CPUID_INDEX_7,
-    COMMON_CPUID_INDEX_80000001,	/* for AMD */
+    COMMON_CPUID_INDEX_80000001,
     /* Keep the following line at the end.  */
     COMMON_CPUID_INDEX_MAX
   };