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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* |
| 2 | * linux/include/asm-i386/timex.h |
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| 3 | * |
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| 4 | * i386 architecture timex specifications |
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| 5 | */ |
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| 6 | #ifndef _ASMi386_TIMEX_H |
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| 7 | #define _ASMi386_TIMEX_H |
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| 8 | |||
| 9 | #include <linux/config.h> |
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| 10 | #include <asm/msr.h> |
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| 11 | |||
| 12 | #ifdef CONFIG_X86_PC9800 |
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| 13 | extern int CLOCK_TICK_RATE; |
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| 14 | #else |
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| 15 | #ifdef CONFIG_MELAN |
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| 16 | # define CLOCK_TICK_RATE 1189200 /* AMD Elan has different frequency! */ |
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| 17 | #else |
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| 18 | # define CLOCK_TICK_RATE 1193182 /* Underlying HZ */ |
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| 19 | #endif |
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| 20 | #endif |
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| 21 | |||
| 22 | #define CLOCK_TICK_FACTOR 20 /* Factor of both 1000000 and CLOCK_TICK_RATE */ |
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| 23 | #define FINETUNE ((((((long)LATCH * HZ - CLOCK_TICK_RATE) << SHIFT_HZ) * \ |
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| 24 | (1000000/CLOCK_TICK_FACTOR) / (CLOCK_TICK_RATE/CLOCK_TICK_FACTOR)) \ |
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| 25 | << (SHIFT_SCALE-SHIFT_HZ)) / HZ) |
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| 26 | |||
| 27 | /* |
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| 28 | * Standard way to access the cycle counter on i586+ CPUs. |
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| 29 | * Currently only used on SMP. |
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| 30 | * |
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| 31 | * If you really have a SMP machine with i486 chips or older, |
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| 32 | * compile for that, and this will just always return zero. |
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| 33 | * That's ok, it just means that the nicer scheduling heuristics |
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| 34 | * won't work for you. |
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| 35 | * |
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| 36 | * We only use the low 32 bits, and we'd simply better make sure |
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| 37 | * that we reschedule before that wraps. Scheduling at least every |
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| 38 | * four billion cycles just basically sounds like a good idea, |
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| 39 | * regardless of how fast the machine is. |
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| 40 | */ |
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| 41 | typedef unsigned long long cycles_t; |
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| 42 | |||
| 43 | extern cycles_t cacheflush_time; |
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| 44 | |||
| 45 | static inline cycles_t get_cycles (void) |
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| 46 | { |
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| 47 | #ifndef CONFIG_X86_TSC |
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| 48 | return 0; |
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| 49 | #else |
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| 50 | unsigned long long ret; |
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| 51 | |||
| 52 | rdtscll(ret); |
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| 53 | return ret; |
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| 54 | #endif |
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| 55 | } |
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| 56 | |||
| 57 | extern unsigned long cpu_khz; |
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| 58 | |||
| 59 | #endif |