]> err.no Git - linux-2.6/commitdiff
x86: add framework to disable CPUID bits on the command line
authorAndi Kleen <ak@suse.de>
Wed, 30 Jan 2008 12:33:20 +0000 (13:33 +0100)
committerIngo Molnar <mingo@elte.hu>
Wed, 30 Jan 2008 12:33:20 +0000 (13:33 +0100)
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>
arch/x86/kernel/cpu/common.c
arch/x86/kernel/setup_64.c
include/asm-x86/cpufeature.h
include/asm-x86/processor.h

index 4bd326d0322c7de7f013a3a5bea4c295c32ea132..f0f29ddf33a269694cdad172fbeacd3ed6d66f3d 100644 (file)
@@ -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);
 
index 7edb43f0b27961713f214070c776816e83155ceb..df159520bbd220b3db0af639375f7bd2c79c61fd 100644 (file)
@@ -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
index 29727bf0e17756a9ee8bf55906ff4649a65f6cc8..b8f53f869e1f0c3152df94032048597c3127c0f5 100644 (file)
 
 #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)
index 81ecfed83e47a5fc4ad8f1df1e876883bb779705..ab4d0c2a3f8f286b792e2b2b724c6186849fb5e3 100644 (file)
@@ -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);