linux-kernel - [PATCH 1/10 -tip] x86: Add cpufeature for Processor Name

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Date:	Tue, 12 May 2009 21:07:03 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"H. Peter Anvin" <hpa@...nel.org>,
	Robert Richter <robert.richter@....com>,
	Dave Jones <davej@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	x86 maintainers <x86@...nel.org>
Subject: [PATCH 1/10 -tip] x86: Add cpufeature for Processor Name


Processor Name / Brand String (Function 8000_0002h, 8000_0003h, 8000_0004h)
Functions 8000_0002h, 8000_0003h, and 8000_0004h each return up to 16 ASCII
bytes of the processor name in the EAX, EBX, ECX and EDX registers.

X86_FEATURE_PNAME will be useful for displaying MSRs like AMD:
MSRC001_00[35:30] Processor Name String Registers

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
---
 arch/x86/include/asm/cpufeature.h |    5 +++--
 arch/x86/kernel/cpu/common.c      |   10 ++++++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 13cc6a5..e1a4cc4 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -153,8 +153,9 @@
  * Auxiliary flags: Linux defined - For features scattered in various
  * CPUID levels like 0x6, 0xA etc
  */
-#define X86_FEATURE_IDA		(7*32+ 0) /* Intel Dynamic Acceleration */
-#define X86_FEATURE_ARAT	(7*32+ 1) /* Always Running APIC Timer */
+#define X86_FEATURE_IDA		(7*32+ 0) /* Intel Dynamic Acceleration	*/
+#define X86_FEATURE_ARAT	(7*32+ 1) /* Always Running APIC Timer	*/
+#define X86_FEATURE_PNAME	(7*32+ 2) /* Processor Name		*/
 
 /* Virtualization flags: Linux defined */
 #define X86_FEATURE_TPR_SHADOW  (8*32+ 0) /* Intel TPR Shadow */
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index e7fd5c4..542684c 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -563,6 +563,16 @@ static void __cpuinit get_cpu_cap(struct cpuinfo_x86 *c)
 		}
 	}
 
+	/*
+	 * Processor Name / Brand String
+	 * (Function 8000_0002h, 8000_0003h, 8000_0004h)
+	 * Functions 8000_0002h, 8000_0003h, and 8000_0004h each return up to
+	 * 16 ASCII bytes of the processor name in the EAX, EBX, ECX and EDX
+	 * registers.
+	 */
+	if (c->extended_cpuid_level >= 0x80000004)
+		set_cpu_cap(c, X86_FEATURE_PNAME);
+
 	if (c->extended_cpuid_level >= 0x80000008) {
 		u32 eax = cpuid_eax(0x80000008);
 
-- 
1.6.0.6



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