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Commit 73767759 authored by Borislav Petkov's avatar Borislav Petkov Committed by Greg Kroah-Hartman
Browse files

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



commit 5dedade6dfa243c130b85d1e4daba6f027805033 upstream.

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

Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/20170109114147.5082-2-bp@alien8.de


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Evalds Iodzevics <evalds.iodzevics@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent bed37eb4

arch/x86/include/asm/processor.h

+18 −0
Original line number Diff line number Diff line
@@ -213,6 +213,24 @@ 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));