diff options
Diffstat (limited to 'arch/powerpc/include/asm/timex.h')
-rw-r--r-- | arch/powerpc/include/asm/timex.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/timex.h b/arch/powerpc/include/asm/timex.h new file mode 100644 index 000000000..2cf846edb --- /dev/null +++ b/arch/powerpc/include/asm/timex.h @@ -0,0 +1,58 @@ +#ifndef _ASM_POWERPC_TIMEX_H +#define _ASM_POWERPC_TIMEX_H + +#ifdef __KERNEL__ + +/* + * PowerPC architecture timex specifications + */ + +#include <asm/cputable.h> +#include <asm/reg.h> + +#define CLOCK_TICK_RATE 1024000 /* Underlying HZ */ + +typedef unsigned long cycles_t; + +static inline cycles_t get_cycles(void) +{ +#ifdef __powerpc64__ + return mftb(); +#else + cycles_t ret; + + /* + * For the "cycle" counter we use the timebase lower half. + * Currently only used on SMP. + */ + + ret = 0; + + __asm__ __volatile__( +#ifdef CONFIG_8xx + "97: mftb %0\n" +#else + "97: mfspr %0, %2\n" +#endif + "99:\n" + ".section __ftr_fixup,\"a\"\n" + ".align 2\n" + "98:\n" + " .long %1\n" + " .long 0\n" + " .long 97b-98b\n" + " .long 99b-98b\n" + " .long 0\n" + " .long 0\n" + ".previous" +#ifdef CONFIG_8xx + : "=r" (ret) : "i" (CPU_FTR_601)); +#else + : "=r" (ret) : "i" (CPU_FTR_601), "i" (SPRN_TBRL)); +#endif + return ret; +#endif +} + +#endif /* __KERNEL__ */ +#endif /* _ASM_POWERPC_TIMEX_H */ |