From: Mathias Krause <minipli@googlemail.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
Mathias Krause <minipli@googlemail.com>,
Borislav Petkov <bp@alien8.de>
Subject: [PATCH] x86, cpufeature: add feature bit for SDBG
Date: Sun, 19 Jul 2015 20:26:43 +0200 [thread overview]
Message-ID: <1437330403-12102-1-git-send-email-minipli@googlemail.com> (raw)
Add a CPUID feature bit for the SDBG (Silicon Debug) CPU feature found
on recent Intel systems starting with Haswell.
Using the IA32_DEBUG_INTERFACE MSR (index C80H) one can at least detect
if SDBG has been enabled by the firmware and if it has been used or not.
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/include/asm/cpufeature.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 3d6606fb97d0..4b11974b4ea7 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -119,6 +119,7 @@
#define X86_FEATURE_TM2 ( 4*32+ 8) /* Thermal Monitor 2 */
#define X86_FEATURE_SSSE3 ( 4*32+ 9) /* Supplemental SSE-3 */
#define X86_FEATURE_CID ( 4*32+10) /* Context ID */
+#define X86_FEATURE_SDBG ( 4*32+11) /* Silicon Debug */
#define X86_FEATURE_FMA ( 4*32+12) /* Fused multiply-add */
#define X86_FEATURE_CX16 ( 4*32+13) /* CMPXCHG16B */
#define X86_FEATURE_XTPR ( 4*32+14) /* Send Task Priority Messages */
--
1.7.10.4
next reply other threads:[~2015-07-19 18:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-19 18:26 Mathias Krause [this message]
2015-07-20 11:54 ` [PATCH] x86, cpufeature: add feature bit for SDBG Borislav Petkov
2015-07-20 15:41 ` Borislav Petkov
2015-07-31 13:57 ` [tip:x86/cpu] x86/cpufeature: Add feature bit for Intel' s Silicon Debug CPUID bit tip-bot for Mathias Krause
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