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Commit 81af4449 authored by Vojtech Pavlik's avatar Vojtech Pavlik Committed by Andi Kleen
Browse files

[PATCH] Add macros for rdtscp 



This patch adds macros for reading tsc via the RDTSCP instruction, as well
as writing the auxilliary MSR read by RDTSCP to msr.h

[AK: changed rdtscp definition for old binutils]

Signed-off-by: default avatarVojtech Pavlik <vojtech@suse.cz>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent 248dcb2f

include/asm-x86_64/msr.h

+11 −0
Original line number Diff line number Diff line
@@ -66,14 +66,25 @@ 
#define rdtscl(low) \

     __asm__ __volatile__ ("rdtsc" : "=a" (low) : : "edx")



#define rdtscp(low,high,aux) \

     asm volatile (".byte 0x0f,0x01,0xf9" : "=a" (low), "=d" (high), "=c" (aux))



#define rdtscll(val) do { \

     unsigned int __a,__d; \

     asm volatile("rdtsc" : "=a" (__a), "=d" (__d)); \

     (val) = ((unsigned long)__a) | (((unsigned long)__d)<<32); \

} while(0)



#define rdtscpll(val, aux) do { \

     unsigned long __a, __d; \

     asm volatile (".byte 0x0f,0x01,0xf9" : "=a" (__a), "=d" (__d), "=c" (aux)); \

     (val) = (__d << 32) | __a; \

} while (0)



#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)



#define write_rdtscp_aux(val) wrmsr(0xc0000103, val, 0)



#define rdpmc(counter,low,high) \

     __asm__ __volatile__("rdpmc" \

			  : "=a" (low), "=d" (high) \