timex.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:2k
- /*
- * linux/include/asm-x8664/timex.h
- *
- * x8664 architecture timex specifications
- */
- #ifndef _ASMx8664_TIMEX_H
- #define _ASMx8664_TIMEX_H
- #include <linux/config.h>
- #include <asm/msr.h>
- #include <asm/vsyscall.h>
- #define CLOCK_TICK_RATE (hpet.address ? hpet.hz : 1193182L)
- #define FINETUNE ((((((long)LATCH * HZ - CLOCK_TICK_RATE) << SHIFT_HZ) *
- 1000000 / CLOCK_TICK_RATE) << (SHIFT_SCALE - SHIFT_HZ)) / HZ)
- /*
- * We only use the low 32 bits, and we'd simply better make sure
- * that we reschedule before that wraps. Scheduling at least every
- * four billion cycles just basically sounds like a good idea,
- * regardless of how fast the machine is.
- */
- typedef unsigned long long cycles_t;
- extern cycles_t cacheflush_time;
- static inline cycles_t get_cycles (void)
- {
- unsigned long long ret;
- rdtscll(ret);
- return ret;
- }
- extern unsigned int cpu_khz;
- /*
- * Documentation on HPET can be found at:
- * http://www.intel.com/ial/home/sp/pcmmspec.htm
- * ftp://download.intel.com/ial/home/sp/mmts098.pdf
- */
- #define HPET_ID 0x000
- #define HPET_PERIOD 0x004
- #define HPET_CFG 0x010
- #define HPET_STATUS 0x020
- #define HPET_COUNTER 0x0f0
- #define HPET_T0_CFG 0x100
- #define HPET_T0_CMP 0x108
- #define HPET_T0_ROUTE 0x110
- #define HPET_ID_VENDOR 0xffff0000
- #define HPET_ID_LEGSUP 0x00008000
- #define HPET_ID_NUMBER 0x00000f00
- #define HPET_ID_REV 0x000000ff
- #define HPET_CFG_ENABLE 0x001
- #define HPET_CFG_LEGACY 0x002
- #define HPET_T0_ENABLE 0x004
- #define HPET_T0_PERIODIC 0x008
- #define HPET_T0_SETVAL 0x040
- #define HPET_T0_32BIT 0x100
- extern struct hpet_data hpet;
- #endif