Fairly straightforward code motion of MSR / TSC / PMC accessors
to the sub-arch level. Note that rdmsr/wrmsr_safe functions are
not moved; Linux relies on the fault behavior here in the event
that certain MSRs are not supported on hardware, and combining
this with a VMI wrapper is overly complicated. The instructions
are virtualizable with trap and emulate, not on critical code
paths, and only used as part of the MSR /proc device, which is
highly sketchy to use inside a virtual machine, but must be
allowed as part of the compile, since it is useful on native.
Signed-off-by: Zachary Amsden <zach@xxxxxxxxxx>
Index: linux-2.6.16-rc5/include/asm-i386/msr.h
===================================================================
--- linux-2.6.16-rc5.orig/include/asm-i386/msr.h 2006-03-08
10:31:10.000000000 -0800
+++ linux-2.6.16-rc5/include/asm-i386/msr.h 2006-03-08 10:32:07.000000000
-0800
@@ -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__); \
@@ -62,22 +54,6 @@ static inline void wrmsrl (unsigned long
: "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-2.6.16-rc5/include/asm-i386/mach-vmi/mach_msr.h
===================================================================
--- linux-2.6.16-rc5.orig/include/asm-i386/mach-vmi/mach_msr.h 2006-03-08
10:32:07.000000000 -0800
+++ linux-2.6.16-rc5/include/asm-i386/mach-vmi/mach_msr.h 2006-03-08
10:32:30.000000000 -0800
@@ -0,0 +1,79 @@
+#ifndef MACH_MSR_H
+#define MACH_MSR_H
+
+#include <vmi.h>
+
+static inline u64 vmi_rdmsr(const u32 msr)
+{
+ u64 ret;
+ vmi_wrap_call(
+ RDMSR, "rdmsr",
+ VMI_OREG64 (ret),
+ 1, "c" (msr),
+ VMI_CLOBBER(TWO_RETURNS));
+ return ret;
+}
+
+#define rdmsr(msr,val1,val2) \
+do { \
+ u64 _val = vmi_rdmsr(msr); \
+ val1 = (u32)_val; \
+ val2 = (u32)(_val >> 32); \
+} while (0)
+
+static inline void wrmsr(const u32 msr, const u32 valLo, const u32 valHi)
+{
+ vmi_wrap_call(
+ WRMSR, "wrmsr",
+ VMI_NO_OUTPUT,
+ 3, XCONC("a"(valLo), "d"(valHi), "c"(msr)),
+ VMI_CLOBBER_EXTENDED(ZERO_RETURNS, "memory"));
+}
+
+static inline u64 vmi_rdtsc(void)
+{
+ u64 ret;
+ vmi_wrap_call(
+ RDTSC, "rdtsc",
+ VMI_OREG64 (ret),
+ 0, VMI_NO_INPUT,
+ VMI_CLOBBER(TWO_RETURNS));
+ return ret;
+}
+
+#define rdtsc(low,high) \
+do { \
+ u64 _val = vmi_rdtsc(); \
+ low = (u32)_val; \
+ high = (u32)(_val >> 32); \
+} while (0)
+
+#define rdtscl(low) \
+do { \
+ u64 _val = vmi_rdtsc(); \
+ low = (u32)_val; \
+} while (0)
+
+#define rdtscll(val) do { val = vmi_rdtsc(); } while (0)
+
+#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
+
+static inline u64 vmi_rdpmc(const u32 counter)
+{
+ u64 ret;
+ vmi_wrap_call(
+ RDPMC, "rdpmc",
+ VMI_OREG64 (ret),
+ 1, "c" (counter),
+ VMI_CLOBBER(TWO_RETURNS));
+ return ret;
+}
+
+#define rdpmc(counter,val1,val2) \
+do { \
+ u64 _val = vmi_rdpmc(counter); \
+ val1 = (u32)_val; \
+ val2 = (u32)(_val >> 32); \
+} while (0)
+
+#endif
Index: linux-2.6.16-rc5/include/asm-i386/mach-default/mach_msr.h
===================================================================
--- linux-2.6.16-rc5.orig/include/asm-i386/mach-default/mach_msr.h
2006-03-08 10:32:07.000000000 -0800
+++ linux-2.6.16-rc5/include/asm-i386/mach-default/mach_msr.h 2006-03-08
10:32:07.000000000 -0800
@@ -0,0 +1,30 @@
+#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))
+
+#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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