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x86/CPU: Add native CPUID variants returning a single datum 

... similarly to the cpuid_<reg>() variants.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/20170109114147.5082-2-bp@alien8.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Borislav Petkov 2017-01-09 12:41:43 +01:00 committed by Thomas Gleixner
parent fac69d0efa
commit 5dedade6df
1 changed files with 18 additions and 0 deletions
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18
arch/x86/include/asm/processor.h
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@ -219,6 +219,24 @@ static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
: "memory");
}
#define native_cpuid_reg(reg) \
static inline unsigned int native_cpuid_##reg(unsigned int op) \
{ \
unsigned int eax = op, ebx, ecx = 0, edx; \
\
native_cpuid(&eax, &ebx, &ecx, &edx); \
\
return reg; \
}
/*
* Native CPUID functions returning a single datum.
*/
native_cpuid_reg(eax)
native_cpuid_reg(ebx)
native_cpuid_reg(ecx)
native_cpuid_reg(edx)
static inline void load_cr3(pgd_t *pgdir)
{
write_cr3(__pa(pgdir));