diff options
Diffstat (limited to 'include/asm-x86/processor.h')
| -rw-r--r-- | include/asm-x86/processor.h | 90 |
1 files changed, 89 insertions, 1 deletions
diff --git a/include/asm-x86/processor.h b/include/asm-x86/processor.h index 36ee9881b74..8d0af7bf090 100644 --- a/include/asm-x86/processor.h +++ b/include/asm-x86/processor.h @@ -29,9 +29,97 @@ static inline void load_cr3(pgd_t *pgdir) # include "processor_64.h" #endif +static inline unsigned long native_get_debugreg(int regno) +{ + unsigned long val = 0; /* Damn you, gcc! */ + + switch (regno) { + case 0: + asm("mov %%db0, %0" :"=r" (val)); break; + case 1: + asm("mov %%db1, %0" :"=r" (val)); break; + case 2: + asm("mov %%db2, %0" :"=r" (val)); break; + case 3: + asm("mov %%db3, %0" :"=r" (val)); break; + case 6: + asm("mov %%db6, %0" :"=r" (val)); break; + case 7: + asm("mov %%db7, %0" :"=r" (val)); break; + default: + BUG(); + } + return val; +} + +static inline void native_set_debugreg(int regno, unsigned long value) +{ + switch (regno) { + case 0: + asm("mov %0,%%db0" : /* no output */ :"r" (value)); + break; + case 1: + asm("mov %0,%%db1" : /* no output */ :"r" (value)); + break; + case 2: + asm("mov %0,%%db2" : /* no output */ :"r" (value)); + break; + case 3: + asm("mov %0,%%db3" : /* no output */ :"r" (value)); + break; + case 6: + asm("mov %0,%%db6" : /* no output */ :"r" (value)); + break; + case 7: + asm("mov %0,%%db7" : /* no output */ :"r" (value)); + break; + default: + BUG(); + } +} + + #ifndef CONFIG_PARAVIRT #define __cpuid native_cpuid -#endif +#define paravirt_enabled() 0 + +/* + * These special macros can be used to get or set a debugging register + */ +#define get_debugreg(var, register) \ + (var) = native_get_debugreg(register) +#define set_debugreg(value, register) \ + native_set_debugreg(register, value) + +#endif /* CONFIG_PARAVIRT */ + +/* + * Save the cr4 feature set we're using (ie + * Pentium 4MB enable and PPro Global page + * enable), so that any CPU's that boot up + * after us can get the correct flags. + */ +extern unsigned long mmu_cr4_features; + +static inline void set_in_cr4(unsigned long mask) +{ + unsigned cr4; + mmu_cr4_features |= mask; + cr4 = read_cr4(); + cr4 |= mask; + write_cr4(cr4); +} + +static inline void clear_in_cr4(unsigned long mask) +{ + unsigned cr4; + mmu_cr4_features &= ~mask; + cr4 = read_cr4(); + cr4 &= ~mask; + write_cr4(cr4); +} + + /* * Generic CPUID function |