Messages in this thread Patch in this message | | | Subject | [PATCH] x86: pat cpu feature bit setting for known cpus | Date | Mon, 24 Mar 2008 23:24:34 -0700 | From | Yinghai Lu <> |
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[PATCH] x86: pat cpu feature bit setting for known cpus
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index eb94460..b186047 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -309,6 +309,19 @@ static void __cpuinit early_get_cap(struct cpuinfo_x86 *c) } + clear_cpu_cap(c, X86_FEATURE_PAT); + + switch (c->x86_vendor) { + case X86_VENDOR_AMD: + if (c->x86 >= 0xf && c->x86 <= 0x11) + set_cpu_cap(c, X86_FEATURE_PAT); + break; + case X86_VENDOR_INTEL: + if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15)) + set_cpu_cap(c, X86_FEATURE_PAT); + break; + } + } /* @@ -397,6 +410,18 @@ static void __cpuinit generic_identify(struct cpuinfo_x86 *c) init_scattered_cpuid_features(c); } + clear_cpu_cap(c, X86_FEATURE_PAT); + + switch (c->x86_vendor) { + case X86_VENDOR_AMD: + if (c->x86 >= 0xf && c->x86 <= 0x11) + set_cpu_cap(c, X86_FEATURE_PAT); + break; + case X86_VENDOR_INTEL: + if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15)) + set_cpu_cap(c, X86_FEATURE_PAT); + break; + } } static void __cpuinit squash_the_stupid_serial_number(struct cpuinfo_x86 *c) diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c index 3f1dc97..ddaaaaa 100644 --- a/arch/x86/kernel/setup_64.c +++ b/arch/x86/kernel/setup_64.c @@ -979,12 +979,19 @@ static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c) if (c->extended_cpuid_level >= 0x80000007) c->x86_power = cpuid_edx(0x80000007); + + clear_cpu_cap(c, X86_FEATURE_PAT); + switch (c->x86_vendor) { case X86_VENDOR_AMD: early_init_amd(c); + if (c->x86 >= 0xf && c->x86 <= 0x11) + set_cpu_cap(c, X86_FEATURE_PAT); break; case X86_VENDOR_INTEL: early_init_intel(c); + if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15)) + set_cpu_cap(c, X86_FEATURE_PAT); break; } --- a/arch/x86/mm/pat.c 2008-03-24 23:10:32.000000000 -0700 +++ b/arch/x86/mm/pat.c 2008-03-24 23:11:38.000000000 -0700 @@ -42,19 +42,8 @@ if (!pat_wc_enabled) return 0; - if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && - (boot_cpu_data.x86 == 0xF || - (boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model >= 15))) { - if (cpu_has_pat) { - return 1; - } - } - if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && - boot_cpu_data.x86 >= 0xf && boot_cpu_data.x86 <= 0x11) { - if (cpu_has_pat) { - return 1; - } - } + if (cpu_has_pat) + return 1; pat_wc_enabled = 0; printk(KERN_INFO "CPU and/or kernel does not support PAT.\n");
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