#ifndef _ASM_POWERPC_TIMEX_H | |
#define _ASM_POWERPC_TIMEX_H | |
#ifdef __KERNEL__ | |
/* | |
* PowerPC architecture timex specifications | |
*/ | |
#include <asm/cputable.h> | |
#define CLOCK_TICK_RATE 1024000 /* Underlying HZ */ | |
typedef unsigned long cycles_t; | |
static inline cycles_t get_cycles(void) | |
{ | |
cycles_t ret; | |
#ifdef __powerpc64__ | |
__asm__ __volatile__("mftb %0" : "=r" (ret) : ); | |
#else | |
/* | |
* For the "cycle" counter we use the timebase lower half. | |
* Currently only used on SMP. | |
*/ | |
ret = 0; | |
__asm__ __volatile__( | |
"98: mftb %0\n" | |
"99:\n" | |
".section __ftr_fixup,\"a\"\n" | |
" .long %1\n" | |
" .long 0\n" | |
" .long 98b\n" | |
" .long 99b\n" | |
".previous" | |
: "=r" (ret) : "i" (CPU_FTR_601)); | |
#endif | |
return ret; | |
} | |
#endif /* __KERNEL__ */ | |
#endif /* _ASM_POWERPC_TIMEX_H */ |