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authorThomas Gleixner <tglx@linutronix.de>2008-09-22 19:02:25 +0200
committerThomas Gleixner <tglx@linutronix.de>2008-09-23 11:38:53 +0200
commita8d6829044901a67732904be5f1eacdf8539604f (patch)
tree9540f55fd2beb716a5dda0146e3e742c5a48e380 /include/asm-x86/cpufeature.h
parentclockevents: prevent mode mismatch on cpu online (diff)
downloadlinux-a8d6829044901a67732904be5f1eacdf8539604f.tar.xz
linux-a8d6829044901a67732904be5f1eacdf8539604f.zip
x86: prevent C-states hang on AMD C1E enabled machines
Impact: System hang when AMD C1E machines switch into C2/C3 AMD C1E enabled systems do not work with normal ACPI C-states even if the BIOS is advertising them. Limit the C-states to C1 for the ACPI processor idle code. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/asm-x86/cpufeature.h')
-rw-r--r--include/asm-x86/cpufeature.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-x86/cpufeature.h b/include/asm-x86/cpufeature.h
index 9489283a4bcf..cfcfb0a806ba 100644
--- a/include/asm-x86/cpufeature.h
+++ b/include/asm-x86/cpufeature.h
@@ -81,6 +81,7 @@
#define X86_FEATURE_LFENCE_RDTSC (3*32+18) /* Lfence synchronizes RDTSC */
#define X86_FEATURE_11AP (3*32+19) /* Bad local APIC aka 11AP */
#define X86_FEATURE_NOPL (3*32+20) /* The NOPL (0F 1F) instructions */
+#define X86_FEATURE_AMDC1E (3*32+21) /* AMD C1E detected */
/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
#define X86_FEATURE_XMM3 (4*32+ 0) /* Streaming SIMD Extensions-3 */