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authorBorislav Petkov <bp@suse.de>2017-01-09 12:41:43 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-09 23:11:13 +0100
commit5dedade6dfa243c130b85d1e4daba6f027805033 (patch)
treec6e315a77002b5d3e3b3305fbc4844fe813ef022 /arch
parentfac69d0efad08fc15e4dbfc116830782acc0dc9a (diff)
downloadlinux-5dedade6dfa243c130b85d1e4daba6f027805033.tar.bz2
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/processor.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index eaf100508c36..1be64da0384e 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -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));