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-rw-r--r--src/arch/x86/include/arch/cpuid.h21
1 files changed, 9 insertions, 12 deletions
diff --git a/src/arch/x86/include/arch/cpuid.h b/src/arch/x86/include/arch/cpuid.h
index 70a5beb9b9..b2780bec47 100644
--- a/src/arch/x86/include/arch/cpuid.h
+++ b/src/arch/x86/include/arch/cpuid.h
@@ -56,39 +56,36 @@ static inline uint32_t cpuid_eax(uint32_t eax)
return eax;
}
-static inline uint32_t cpuid_ebx(const uint32_t eax)
+static inline uint32_t cpuid_ebx(uint32_t eax)
{
uint32_t ebx;
asm volatile(
"cpuid;"
- : "=b" (ebx)
- : "a" (eax)
- : "ecx", "edx");
+ : "=b" (ebx), "+a" (eax)
+ :: "ecx", "edx");
return ebx;
}
-static inline uint32_t cpuid_ecx(const uint32_t eax)
+static inline uint32_t cpuid_ecx(uint32_t eax)
{
uint32_t ecx;
asm volatile(
"cpuid;"
- : "=c" (ecx)
- : "a" (eax)
- : "ebx", "edx");
+ : "=c" (ecx), "+a" (eax)
+ :: "ebx", "edx");
return ecx;
}
-static inline uint32_t cpuid_edx(const uint32_t eax)
+static inline uint32_t cpuid_edx(uint32_t eax)
{
uint32_t edx;
asm volatile(
"cpuid;"
- : "=d" (edx)
- : "a" (eax)
- : "ebx", "ecx");
+ : "=d" (edx), "+a" (eax)
+ :: "ebx", "ecx");
return edx;
}