i386 Transparent Paravirtualization Subarch Patch #1
This change encapsulates MSR register accessors and moves them into the
sub-architecture layer. The goal is a clean, uniform interface that may
be redefined on new sub-architectures of i386.
Diffs against: linux-2.6.13-rc4-mm1
Signed-off-by: Zachary Amsden <[email protected]>
Index: linux-2.6.13/include/asm-i386/msr.h
===================================================================
--- linux-2.6.13.orig/include/asm-i386/msr.h 2005-08-02 17:08:58.000000000 -0700
+++ linux-2.6.13/include/asm-i386/msr.h 2005-08-02 17:13:43.000000000 -0700
@@ -1,22 +1,14 @@
#ifndef __ASM_MSR_H
#define __ASM_MSR_H
+#include <mach_msr.h>
+
/*
* Access to machine-specific registers (available on 586 and better only)
* Note: the rd* operations modify the parameters directly (without using
* pointer indirection), this allows gcc to optimize better
*/
-#define rdmsr(msr,val1,val2) \
- __asm__ __volatile__("rdmsr" \
- : "=a" (val1), "=d" (val2) \
- : "c" (msr))
-
-#define wrmsr(msr,val1,val2) \
- __asm__ __volatile__("wrmsr" \
- : /* no outputs */ \
- : "c" (msr), "a" (val1), "d" (val2))
-
#define rdmsrl(msr,val) do { \
unsigned long l__,h__; \
rdmsr (msr, l__, h__); \
@@ -32,52 +24,6 @@
wrmsr (msr, lo, hi);
}
-/* wrmsr with exception handling */
-#define wrmsr_safe(msr,a,b) ({ int ret__; \
- asm volatile("2: wrmsr ; xorl %0,%0\n" \
- "1:\n\t" \
- ".section .fixup,\"ax\"\n\t" \
- "3: movl %4,%0 ; jmp 1b\n\t" \
- ".previous\n\t" \
- ".section __ex_table,\"a\"\n" \
- " .align 4\n\t" \
- " .long 2b,3b\n\t" \
- ".previous" \
- : "=a" (ret__) \
- : "c" (msr), "0" (a), "d" (b), "i" (-EFAULT));\
- ret__; })
-
-/* rdmsr with exception handling */
-#define rdmsr_safe(msr,a,b) ({ int ret__; \
- asm volatile("2: rdmsr ; xorl %0,%0\n" \
- "1:\n\t" \
- ".section .fixup,\"ax\"\n\t" \
- "3: movl %4,%0 ; jmp 1b\n\t" \
- ".previous\n\t" \
- ".section __ex_table,\"a\"\n" \
- " .align 4\n\t" \
- " .long 2b,3b\n\t" \
- ".previous" \
- : "=r" (ret__), "=a" (*(a)), "=d" (*(b)) \
- : "c" (msr), "i" (-EFAULT));\
- ret__; })
-
-#define rdtsc(low,high) \
- __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high))
-
-#define rdtscl(low) \
- __asm__ __volatile__("rdtsc" : "=a" (low) : : "edx")
-
-#define rdtscll(val) \
- __asm__ __volatile__("rdtsc" : "=A" (val))
-
-#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
-
-#define rdpmc(counter,low,high) \
- __asm__ __volatile__("rdpmc" \
- : "=a" (low), "=d" (high) \
- : "c" (counter))
-
/* symbolic names for some interesting MSRs */
/* Intel defined MSRs. */
#define MSR_IA32_P5_MC_ADDR 0
Index: linux-2.6.13/include/asm-i386/mach-default/mach_msr.h
===================================================================
--- linux-2.6.13.orig/include/asm-i386/mach-default/mach_msr.h 2005-08-02 17:12:02.000000000 -0700
+++ linux-2.6.13/include/asm-i386/mach-default/mach_msr.h 2005-08-02 17:14:11.000000000 -0700
@@ -0,0 +1,60 @@
+#ifndef MACH_MSR_H
+#define MACH_MSR_H
+
+#define rdmsr(msr,val1,val2) \
+ __asm__ __volatile__("rdmsr" \
+ : "=a" (val1), "=d" (val2) \
+ : "c" (msr))
+
+#define wrmsr(msr,val1,val2) \
+ __asm__ __volatile__("wrmsr" \
+ : /* no outputs */ \
+ : "c" (msr), "a" (val1), "d" (val2))
+
+/* wrmsr with exception handling */
+#define wrmsr_safe(msr,a,b) ({ int ret__; \
+ asm volatile("2: wrmsr ; xorl %0,%0\n" \
+ "1:\n\t" \
+ ".section .fixup,\"ax\"\n\t" \
+ "3: movl %4,%0 ; jmp 1b\n\t" \
+ ".previous\n\t" \
+ ".section __ex_table,\"a\"\n" \
+ " .align 4\n\t" \
+ " .long 2b,3b\n\t" \
+ ".previous" \
+ : "=a" (ret__) \
+ : "c" (msr), "0" (a), "d" (b), "i" (-EFAULT));\
+ ret__; })
+
+/* rdmsr with exception handling */
+#define rdmsr_safe(msr,a,b) ({ int ret__; \
+ asm volatile("2: rdmsr ; xorl %0,%0\n" \
+ "1:\n\t" \
+ ".section .fixup,\"ax\"\n\t" \
+ "3: movl %4,%0 ; jmp 1b\n\t" \
+ ".previous\n\t" \
+ ".section __ex_table,\"a\"\n" \
+ " .align 4\n\t" \
+ " .long 2b,3b\n\t" \
+ ".previous" \
+ : "=r" (ret__), "=a" (*(a)), "=d" (*(b)) \
+ : "c" (msr), "i" (-EFAULT));\
+ ret__; })
+
+#define rdtsc(low,high) \
+ __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high))
+
+#define rdtscl(low) \
+ __asm__ __volatile__("rdtsc" : "=a" (low) : : "edx")
+
+#define rdtscll(val) \
+ __asm__ __volatile__("rdtsc" : "=A" (val))
+
+#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
+
+#define rdpmc(counter,low,high) \
+ __asm__ __volatile__("rdpmc" \
+ : "=a" (low), "=d" (high) \
+ : "c" (counter))
+
+#endif
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