| jdl@freescale.com | dd56fdf | 2005-09-07 15:59:48 -0500 | [diff] [blame] | 1 | #ifndef _ASM_POWERPC_TIMEX_H |
| 2 | #define _ASM_POWERPC_TIMEX_H |
| 3 | |
| 4 | #ifdef __KERNEL__ |
| 5 | |
| 6 | /* |
| 7 | * PowerPC architecture timex specifications |
| 8 | */ |
| 9 | |
| 10 | #include <linux/config.h> |
| 11 | #include <asm/cputable.h> |
| 12 | |
| Benjamin Herrenschmidt | cbd27b8 | 2005-10-12 11:39:33 +1000 | [diff] [blame] | 13 | #define CLOCK_TICK_RATE 1024000 /* Underlying HZ */ |
| jdl@freescale.com | dd56fdf | 2005-09-07 15:59:48 -0500 | [diff] [blame] | 14 | |
| 15 | typedef unsigned long cycles_t; |
| 16 | |
| 17 | static inline cycles_t get_cycles(void) |
| 18 | { |
| 19 | cycles_t ret; |
| 20 | |
| 21 | #ifdef __powerpc64__ |
| 22 | |
| 23 | __asm__ __volatile__("mftb %0" : "=r" (ret) : ); |
| 24 | |
| 25 | #else |
| 26 | /* |
| 27 | * For the "cycle" counter we use the timebase lower half. |
| 28 | * Currently only used on SMP. |
| 29 | */ |
| 30 | |
| 31 | ret = 0; |
| 32 | |
| 33 | __asm__ __volatile__( |
| 34 | "98: mftb %0\n" |
| 35 | "99:\n" |
| 36 | ".section __ftr_fixup,\"a\"\n" |
| 37 | " .long %1\n" |
| 38 | " .long 0\n" |
| 39 | " .long 98b\n" |
| 40 | " .long 99b\n" |
| 41 | ".previous" |
| 42 | : "=r" (ret) : "i" (CPU_FTR_601)); |
| 43 | #endif |
| 44 | |
| 45 | return ret; |
| 46 | } |
| 47 | |
| 48 | #endif /* __KERNEL__ */ |
| 49 | #endif /* _ASM_POWERPC_TIMEX_H */ |