| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/include/asm-alpha/timex.h |
| 3 | * |
| 4 | * ALPHA architecture timex specifications |
| 5 | */ |
| 6 | #ifndef _ASMALPHA_TIMEX_H |
| 7 | #define _ASMALPHA_TIMEX_H |
| 8 | |
| 9 | /* With only one or two oddballs, we use the RTC as the ticker, selecting |
| 10 | the 32.768kHz reference clock, which nicely divides down to our HZ. */ |
| 11 | #define CLOCK_TICK_RATE 32768 |
| 12 | |
| 13 | /* |
| 14 | * Standard way to access the cycle counter. |
| 15 | * Currently only used on SMP for scheduling. |
| 16 | * |
| 17 | * Only the low 32 bits are available as a continuously counting entity. |
| 18 | * But this only means we'll force a reschedule every 8 seconds or so, |
| 19 | * which isn't an evil thing. |
| 20 | */ |
| 21 | |
| 22 | typedef unsigned int cycles_t; |
| 23 | |
| 24 | static inline cycles_t get_cycles (void) |
| 25 | { |
| 26 | cycles_t ret; |
| 27 | __asm__ __volatile__ ("rpcc %0" : "=r"(ret)); |
| 28 | return ret; |
| 29 | } |
| 30 | |
| 31 | #endif |