| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * include/asm-ppc/timex.h |
| 3 | * |
| 4 | * ppc architecture timex specifications |
| 5 | */ |
| 6 | #ifdef __KERNEL__ |
| 7 | #ifndef _ASMppc_TIMEX_H |
| 8 | #define _ASMppc_TIMEX_H |
| 9 | |
| 10 | #include <linux/config.h> |
| 11 | #include <asm/cputable.h> |
| 12 | |
| 13 | #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */ |
| 14 | |
| 15 | typedef unsigned long cycles_t; |
| 16 | |
| 17 | /* |
| 18 | * For the "cycle" counter we use the timebase lower half. |
| 19 | * Currently only used on SMP. |
| 20 | */ |
| 21 | |
| 22 | static inline cycles_t get_cycles(void) |
| 23 | { |
| 24 | cycles_t ret = 0; |
| 25 | |
| 26 | __asm__ __volatile__( |
| 27 | "98: mftb %0\n" |
| 28 | "99:\n" |
| 29 | ".section __ftr_fixup,\"a\"\n" |
| 30 | " .long %1\n" |
| 31 | " .long 0\n" |
| 32 | " .long 98b\n" |
| 33 | " .long 99b\n" |
| 34 | ".previous" |
| 35 | : "=r" (ret) : "i" (CPU_FTR_601)); |
| 36 | return ret; |
| 37 | } |
| 38 | |
| 39 | #endif |
| 40 | #endif /* __KERNEL__ */ |