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x86: add framework to disable CPUID bits on the command line

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There are already various options to disable specific cpuid bits
on the command line. They all use their own variable. Add a generic
mask to make this easier in the future.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andi Kleen 2008-01-30 13:33:20 +01:00 committed by Ingo Molnar
parent f95f2f7b9d
commit 7d851c8d3d
4 changed files with 17 additions and 0 deletions
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6
arch/x86/kernel/cpu/common.c
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@ -57,6 +57,8 @@ DEFINE_PER_CPU(struct gdt_page, gdt_page) = { .gdt = {
} };
EXPORT_PER_CPU_SYMBOL_GPL(gdt_page);
__u32 cleared_cpu_caps[NCAPINTS] __cpuinitdata;
static int cachesize_override __cpuinitdata = -1;
static int disable_x86_fxsr __cpuinitdata;
static int disable_x86_serial_nr __cpuinitdata = 1;
@ -497,6 +499,10 @@ void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
}
/* Clear all flags overriden by options */
for (i = 0; i < NCAPINTS; i++)
c->x86_capability[i] ^= cleared_cpu_caps[i];
/* Init Machine Check Exception if available. */
mcheck_init(c);

6
arch/x86/kernel/setup_64.c
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@ -80,6 +80,8 @@
struct cpuinfo_x86 boot_cpu_data __read_mostly;
EXPORT_SYMBOL(boot_cpu_data);
__u32 cleared_cpu_caps[NCAPINTS] __cpuinitdata;
unsigned long mmu_cr4_features;
/* Boot loader ID as an integer, for the benefit of proc_dointvec */
@ -1013,6 +1015,10 @@ void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
}
/* Clear all flags overriden by options */
for (i = 0; i < NCAPINTS; i++)
c->x86_capability[i] ^= cleared_cpu_caps[i];
#ifdef CONFIG_X86_MCE
mcheck_init(c);
#endif

4
include/asm-x86/cpufeature.h
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@ -131,6 +131,10 @@
#define set_cpu_cap(c, bit) set_bit(bit, (unsigned long *)((c)->x86_capability))
#define clear_cpu_cap(c, bit) clear_bit(bit, (unsigned long *)((c)->x86_capability))
#define setup_clear_cpu_cap(bit) do { \
clear_cpu_cap(&boot_cpu_data, bit); \
set_bit(bit, cleared_cpu_caps); \
} while (0)
#define cpu_has_fpu boot_cpu_has(X86_FEATURE_FPU)
#define cpu_has_vme boot_cpu_has(X86_FEATURE_VME)

1
include/asm-x86/processor.h
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@ -118,6 +118,7 @@ struct cpuinfo_x86 {
extern struct cpuinfo_x86 boot_cpu_data;
extern struct cpuinfo_x86 new_cpu_data;
extern struct tss_struct doublefault_tss;
extern __u32 cleared_cpu_caps[NCAPINTS];
#ifdef CONFIG_SMP
DECLARE_PER_CPU(struct cpuinfo_x86, cpu_info);