i386/linux/linux-2.3.21/include/asm-i386/msr.h

   1 /*
   2  * Access to machine-specific registers (available on 586 and better only)
   3  * Note: the rd* operations modify the parameters directly (without using
   4  * pointer indirection), this allows gcc to optimize better
   5  */
   6
   7 #define rdmsr(msr,val1,val2) \
   8        __asm__ __volatile__("rdmsr" \
   9                             : "=a" (val1), "=d" (val2) \
  10                             : "c" (msr))
  11
  12 #define wrmsr(msr,val1,val2) \
  13      __asm__ __volatile__("wrmsr" \
  14                           : /* no outputs */ \
  15                           : "c" (msr), "a" (val1), "d" (val2))
  16
  17 #define rdtsc(low,high) \
  18      __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high))
  19
  20 #define rdtscl(low) \
  21      __asm__ __volatile__ ("rdtsc" : "=a" (low) : : "edx")
  22
  23 #define rdtscll(val) \
  24      __asm__ __volatile__ ("rdtsc" : "=A" (val))
  25
  26 #define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
  27
  28 #define rdpmc(counter,low,high) \
  29      __asm__ __volatile__("rdpmc" \
  30                           : "=a" (low), "=d" (high) \
  31                           : "c" (counter))
  32