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| author | Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> | 2005-10-30 14:59:35 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-30 17:37:12 -0800 |
| commit | 434440a2804639f11858d9d384c9505927feb186 (patch) | |
| tree | 60bb584d535aa6ff3b632025facd167e844c6009 /arch | |
| parent | 251e6912df43df54570ed68aade703b329c6cd5b (diff) | |
| download | linux-3.10-434440a2804639f11858d9d384c9505927feb186.tar.gz linux-3.10-434440a2804639f11858d9d384c9505927feb186.tar.bz2 linux-3.10-434440a2804639f11858d9d384c9505927feb186.zip | |
[PATCH] x86: bug fix in P6 Machine check initialization
Make P6 MCA initialization code complaint with guidelines in IA-32 SDM
Vol3. Bank 0 control register should not be set by OS and clear status
registers on all banks on reset.
This will prevent false MCE alarms on the systems that has some non-MCE
information left-over in MC0_STATUS on reboot.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/kernel/cpu/mcheck/p6.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/i386/kernel/cpu/mcheck/p6.c b/arch/i386/kernel/cpu/mcheck/p6.c index 3c035b8fa3d..979b18bc95c 100644 --- a/arch/i386/kernel/cpu/mcheck/p6.c +++ b/arch/i386/kernel/cpu/mcheck/p6.c @@ -102,11 +102,16 @@ void __devinit intel_p6_mcheck_init(struct cpuinfo_x86 *c) wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff); nr_mce_banks = l & 0xff; - /* Don't enable bank 0 on intel P6 cores, it goes bang quickly. */ - for (i=1; i<nr_mce_banks; i++) { + /* + * Following the example in IA-32 SDM Vol 3: + * - MC0_CTL should not be written + * - Status registers on all banks should be cleared on reset + */ + for (i=1; i<nr_mce_banks; i++) wrmsr (MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff); + + for (i=0; i<nr_mce_banks; i++) wrmsr (MSR_IA32_MC0_STATUS+4*i, 0x0, 0x0); - } set_in_cr4 (X86_CR4_MCE); printk (KERN_INFO "Intel machine check reporting enabled on CPU#%d.\n", |