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/*
* Kernel interface to machine-dependent clock driver.
* Garrett Wollman, September 1994.
* This file is in the public domain.
*/
#ifndef _MACHINE_CLOCK_H_
#define _MACHINE_CLOCK_H_
#ifdef I586_CPU
/*
* This resets the CPU cycle counter to zero, to make our
* job easier in microtime(). Some fancy ifdefs could speed
* this up for Pentium-only kernels.
* We want this to be done as close as possible to the actual
* timer incrementing in hardclock(), because there is a window
* between the two where the value is no longer valid. Experimentation
* may reveal a good precompensation to apply in microtime().
*/
#define CPU_CLOCKUPDATE(otime, ntime) \
do { \
if(pentium_mhz) { \
__asm __volatile("cli\n" \
"movl (%2),%%eax\n" \
"movl %%eax,(%1)\n" \
"movl 4(%2),%%eax\n" \
"movl %%eax,4(%1)\n" \
"movl $0x10,%%ecx\n" \
"xorl %%eax,%%eax\n" \
"movl %%eax,%%edx\n" \
".byte 0x0f, 0x30\n" \
"sti\n" \
"#%0%1%2" \
: "=m"(*otime) /* no outputs */ \
: "c"(otime), "b"(ntime) /* fake input */ \
: "ax", "cx", "dx"); \
} else { \
*(otime) = *(ntime); \
} \
} while(0)
#else
#define CPU_CLOCKUPDATE(otime, ntime) \
(*(otime) = *(ntime))
#endif
#if defined(KERNEL) && !defined(LOCORE)
#include <sys/cdefs.h>
#include <machine/frame.h>
/*
* i386 to clock driver interface.
* XXX almost all of it is misplaced. i586 stuff is done in isa/clock.c
* and isa stuff is done in i386/microtime.s and i386/support.s.
*/
extern int adjkerntz;
extern int disable_rtc_set;
#ifdef I586_CPU
extern int pentium_mhz;
#endif
extern int timer0_max_count;
extern u_int timer0_overflow_threshold;
extern u_int timer0_prescaler_count;
#ifdef I586_CPU
void calibrate_cyclecounter __P((void));
#endif
void clkintr __P((struct clockframe frame));
void rtcintr __P((struct clockframe frame));
/*
* Driver to clock driver interface.
*/
void DELAY __P((int usec));
int acquire_timer0 __P((int rate,
void (*function)(struct clockframe *frame)));
int acquire_timer2 __P((int mode));
int release_timer0 __P((void));
int release_timer2 __P((void));
int sysbeep __P((int pitch, int period));
#endif /* KERNEL && !LOCORE */
#endif /* !_MACHINE_CLOCK_H_ */
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