Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | Re: [Patch] x86, x86_64: fix cpu model for family 0x6 | Date | Sat, 1 Oct 2005 00:02:16 +0200 |
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On Friday 30 September 2005 20:23, Siddha, Suresh B wrote: > On Fri, Sep 30, 2005 at 03:09:46PM +0200, Petr Vandrovec wrote: > > Siddha, Suresh B wrote: > > > - if (c->x86 == 0xf) { > > > + if (c->x86 == 0xf) > > > c->x86 += (tfms >> 20) & 0xff; > > > + if (c->x86 == 0x6 || c->x86 == 0xf) > > > > Are you sure this is correct? You just incremented c->x86 by extended > > family, so I believe test should be > > > > if (c->x86 == 0x6 || c->x86 >= 0xf) > > My bad. Your suggestion might work. But let me just follow what SDM Vol-2a > says here. New patch appended. > > Andi, please apply. I applied an earlier mix of your original one and Petr's suggestions. Hope it's ok.
x86-64/i386: Fix CPU model for family 6
From: Suresh Siddha <suresh.b.siddha@intel.com>
According to cpuid instruction in IA32 SDM-Vol2, when computing cpu model, we need to consider extended model ID for family 0x6 also.
AK: Also added fixes/simplifcation from Petr Vandrovec
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Andi Kleen <ak@suse.de>
Index: linux/arch/i386/kernel/cpu/common.c =================================================================== --- linux.orig/arch/i386/kernel/cpu/common.c +++ linux/arch/i386/kernel/cpu/common.c @@ -233,10 +233,10 @@ static void __init early_cpu_detect(void cpuid(0x00000001, &tfms, &misc, &junk, &cap0); c->x86 = (tfms >> 8) & 15; c->x86_model = (tfms >> 4) & 15; - if (c->x86 == 0xf) { + if (c->x86 == 0xf) c->x86 += (tfms >> 20) & 0xff; + if (c->x86 >= 0x6) c->x86_model += ((tfms >> 16) & 0xF) << 4; - } c->x86_mask = tfms & 15; if (cap0 & (1<<19)) c->x86_cache_alignment = ((misc >> 8) & 0xff) * 8; Index: linux/arch/x86_64/kernel/setup.c =================================================================== --- linux.orig/arch/x86_64/kernel/setup.c +++ linux/arch/x86_64/kernel/setup.c @@ -1059,10 +1059,10 @@ void __cpuinit early_identify_cpu(struct c->x86 = (tfms >> 8) & 0xf; c->x86_model = (tfms >> 4) & 0xf; c->x86_mask = tfms & 0xf; - if (c->x86 == 0xf) { + if (c->x86 == 0xf) c->x86 += (tfms >> 20) & 0xff; + if (c->x86 >= 0xf) c->x86_model += ((tfms >> 16) & 0xF) << 4; - } if (c->x86_capability[0] & (1<<19)) c->x86_clflush_size = ((misc >> 8) & 0xff) * 8; } else { - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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