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authorBorislav Petkov <bp@suse.de>2017-01-09 12:41:43 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-04-24 07:57:26 +0200
commiteb077831ed8afcb4b68c80ca63be930ac7918bef (patch)
tree0048dba32c24e6a0e079bf60664e029b89ec1146
parent128e99c8c35fb173b473ae865ea4f707e41154d9 (diff)
downloadlinux-rt-eb077831ed8afcb4b68c80ca63be930ac7918bef.tar.gz
x86/CPU: Add native CPUID variants returning a single datum
commit 5dedade6dfa243c130b85d1e4daba6f027805033 upstream. ... 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> Cc: Evalds Iodzevics <evalds.iodzevics@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-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 cac54e61c299..048942d53988 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -212,6 +212,24 @@ 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));