From 7d851c8d3db0f79b92c8b14361779ede8acd2488 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Wed, 30 Jan 2008 13:33:20 +0100 Subject: x86: add framework to disable CPUID bits on the command line 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 Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- include/asm-x86/cpufeature.h | 4 ++++ include/asm-x86/processor.h | 1 + 2 files changed, 5 insertions(+) (limited to 'include') diff --git a/include/asm-x86/cpufeature.h b/include/asm-x86/cpufeature.h index 29727bf0e17..b8f53f869e1 100644 --- a/include/asm-x86/cpufeature.h +++ b/include/asm-x86/cpufeature.h @@ -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) diff --git a/include/asm-x86/processor.h b/include/asm-x86/processor.h index 81ecfed83e4..ab4d0c2a3f8 100644 --- a/include/asm-x86/processor.h +++ b/include/asm-x86/processor.h @@ -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); -- cgit v1.2.3