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x86: pat cpu feature bit setting for known cpus

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Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-03-24 23:24:34 -07:00 committed by Ingo Molnar
parent a7c7d0e91d
commit 9307cacad0
3 changed files with 34 additions and 13 deletions
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25
arch/x86/kernel/cpu/common.c
View File

@ -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)

7
arch/x86/kernel/setup_64.c
View File

@ -962,12 +962,19 @@ 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;
}

15
arch/x86/mm/pat.c
View File

@ -40,19 +40,8 @@ static int pat_known_cpu(void)
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");