linux-kernel - [PATCH 10/15 -tip] x86: Add cpufeature for System configuration

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Date:	Mon, 11 May 2009 22:22:01 +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>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 10/15 -tip] x86: Add cpufeature for System configuration


X86_FEATURE_SYS_CFG (System configuration MSRs) :
 MSRC001_0010 System Configuration Register (SYS_CFG)
 MSRC001_001F Northbridge Configuration Register (NB_CFG)

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
---
 arch/x86/include/asm/cpufeature.h |    1 +
 arch/x86/kernel/cpu/amd.c         |    8 ++++++++
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 13050e9..674493f 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -164,6 +164,7 @@
 #define X86_FEATURE_MISC 	(7*32+ 9) /* Miscellaneous features	*/
 #define X86_FEATURE_PLATFORM 	(7*32+ 10) /* Platform feature		*/
 #define X86_FEATURE_HW_CFG 	(7*32+ 11) /* Hardware configuration	*/
+#define X86_FEATURE_SYS_CFG 	(7*32+ 12) /* System configuration	*/
 
 /* Virtualization flags: Linux defined */
 #define X86_FEATURE_TPR_SHADOW  (8*32+ 0) /* Intel TPR Shadow */
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index b2bccd2..8a8db1a 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -482,6 +482,14 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
 		/* MSRC001_0015 Hardware Configuration Register (HWCR)	*/
 		set_cpu_cap(c, X86_FEATURE_HW_CFG);
 	}
+	if (c->x86 >= 8) {				/* K8+		*/
+		/*
+		 * System configuration MSRs:
+		 * MSRC001_0010 System Configuration Register (SYS_CFG)
+		 * MSRC001_001F Northbridge Configuration Register (NB_CFG)
+		 */
+		set_cpu_cap(c, X86_FEATURE_SYS_CFG);
+	}
 	if (c->x86 >= 0x10) {				/* fam10h+	*/
 		/* MSRC001_1022 Data Cache Configuration (DC_CFG)	*/
 		set_cpu_cap(c, X86_FEATURE_CACHE_CTL);
-- 
1.6.0.6



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