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-rw-r--r--arch/arch-x86.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arch-x86.h b/arch/arch-x86.h
index 69cf60b3..49e64dd3 100644
--- a/arch/arch-x86.h
+++ b/arch/arch-x86.h
@@ -1,6 +1,15 @@
#ifndef ARCH_X86_H
#define ARCH_X86_H
+static inline void do_cpuid(unsigned int *eax, unsigned int *ebx,
+ unsigned int *ecx, unsigned int *edx)
+{
+ asm volatile("xchgl %%ebx, %1\ncpuid\nxchgl %%ebx, %1"
+ : "=a" (*eax), "=r" (*ebx), "=c" (*ecx), "=d" (*edx)
+ : "0" (*eax)
+ : "memory");
+}
+
#include "arch-x86-common.h"
#define FIO_ARCH (arch_i386)