Merge branches 'x86/alternatives', 'x86/cleanups', 'x86/commandline', 'x86/crashdump...

[cascardo/linux.git] / include / asm-x86 / msr.h

diff --git a/include/asm-x86/msr.h b/include/asm-x86/msr.h
index 2362cfd..530af1f 100644 (file)
--- a/include/asm-x86/msr.h
+++ b/include/asm-x86/msr.h
@@ -1,5 +1,5 @@
-#ifndef __ASM_X86_MSR_H_
-#define __ASM_X86_MSR_H_
+#ifndef ASM_X86__MSR_H
+#define ASM_X86__MSR_H
 
 #include <asm/msr-index.h>
 
@@ -63,6 +63,22 @@ static inline unsigned long long native_read_msr_safe(unsigned int msr,
        return EAX_EDX_VAL(val, low, high);
 }
 
+static inline unsigned long long native_read_msr_amd_safe(unsigned int msr,
+                                                     int *err)
+{
+       DECLARE_ARGS(val, low, high);
+
+       asm volatile("2: rdmsr ; xor %0,%0\n"
+                    "1:\n\t"
+                    ".section .fixup,\"ax\"\n\t"
+                    "3:  mov %3,%0 ; jmp 1b\n\t"
+                    ".previous\n\t"
+                    _ASM_EXTABLE(2b, 3b)
+                    : "=r" (*err), EAX_EDX_RET(val, low, high)
+                    : "c" (msr), "D" (0x9c5a203a), "i" (-EFAULT));
+       return EAX_EDX_VAL(val, low, high);
+}
+
 static inline void native_write_msr(unsigned int msr,
                                    unsigned low, unsigned high)
 {
@@ -158,6 +174,13 @@ static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
        *p = native_read_msr_safe(msr, &err);
        return err;
 }
+static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)
+{
+       int err;
+
+       *p = native_read_msr_amd_safe(msr, &err);
+       return err;
+}
 
 #define rdtscl(low)                                            \
        ((low) = (u32)native_read_tsc())
@@ -221,4 +244,4 @@ static inline int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
 #endif /* __KERNEL__ */
 
 
-#endif
+#endif /* ASM_X86__MSR_H */