1 /* SPDX-License-Identifier: GPL-2.0 */ !! 1 /*
2 #ifndef __ASM_GENERIC_TIMEX_H !! 2 * linux/include/asm-i386/timex.h
3 #define __ASM_GENERIC_TIMEX_H !! 3 *
>> 4 * i386 architecture timex specifications
>> 5 */
>> 6 #ifndef _ASMi386_TIMEX_H
>> 7 #define _ASMi386_TIMEX_H
>> 8
>> 9 #include <linux/config.h>
>> 10 #include <asm/msr.h>
>> 11
>> 12 #ifdef CONFIG_X86_PC9800
>> 13 extern int CLOCK_TICK_RATE;
>> 14 #else
>> 15 #ifdef CONFIG_MELAN
>> 16 # define CLOCK_TICK_RATE 1189200 /* AMD Elan has different frequency! */
>> 17 #else
>> 18 # define CLOCK_TICK_RATE 1193182 /* Underlying HZ */
>> 19 #endif
>> 20 #endif
>> 21
>> 22 #define CLOCK_TICK_FACTOR 20 /* Factor of both 1000000 and CLOCK_TICK_RATE */
>> 23 #define FINETUNE ((((((long)LATCH * HZ - CLOCK_TICK_RATE) << SHIFT_HZ) * \
>> 24 (1000000/CLOCK_TICK_FACTOR) / (CLOCK_TICK_RATE/CLOCK_TICK_FACTOR)) \
>> 25 << (SHIFT_SCALE-SHIFT_HZ)) / HZ)
4 26
5 /* 27 /*
6 * If you have a cycle counter, return the val !! 28 * Standard way to access the cycle counter on i586+ CPUs.
>> 29 * Currently only used on SMP.
>> 30 *
>> 31 * If you really have a SMP machine with i486 chips or older,
>> 32 * compile for that, and this will just always return zero.
>> 33 * That's ok, it just means that the nicer scheduling heuristics
>> 34 * won't work for you.
>> 35 *
>> 36 * We only use the low 32 bits, and we'd simply better make sure
>> 37 * that we reschedule before that wraps. Scheduling at least every
>> 38 * four billion cycles just basically sounds like a good idea,
>> 39 * regardless of how fast the machine is.
7 */ 40 */
8 typedef unsigned long cycles_t; !! 41 typedef unsigned long long cycles_t;
9 #ifndef get_cycles !! 42
10 static inline cycles_t get_cycles(void) !! 43 extern cycles_t cacheflush_time;
>> 44
>> 45 static inline cycles_t get_cycles (void)
11 { 46 {
>> 47 #ifndef CONFIG_X86_TSC
12 return 0; 48 return 0;
13 } !! 49 #else
>> 50 unsigned long long ret;
>> 51
>> 52 rdtscll(ret);
>> 53 return ret;
14 #endif 54 #endif
>> 55 }
15 56
16 /* !! 57 extern unsigned long cpu_khz;
17 * Architectures are encouraged to implement r <<
18 * and define this in order to avoid the expen <<
19 * calibration during boot. <<
20 */ <<
21 #undef ARCH_HAS_READ_CURRENT_TIMER <<
22 58
23 #endif /* __ASM_GENERIC_TIMEX_H */ !! 59 #endif
24 60
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