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Add code from i386 to support sysbeep(). Doesn't work quite right but it

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makes a noise.
This commit is contained in:
Doug Rabson 1998-07-22 08:16:34 +00:00
parent e344c90c80
commit b50b3bda1d
1 changed files with 86 additions and 1 deletions
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87
sys/alpha/alpha/clock.c
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@ -1,4 +1,4 @@
/* $Id: clock.c,v 1.1 1998/06/10 10:52:13 dfr Exp $ */
/* $Id: clock.c,v 1.2 1998/06/14 13:44:38 dfr Exp $ */
/* $NetBSD: clock.c,v 1.20 1998/01/31 10:32:47 ross Exp $ */
/*
@ -53,6 +53,8 @@
#include <machine/cpuconf.h>
#include <machine/clockvar.h>
#include <isa/isareg.h>
#include <alpha/alpha/timerreg.h>
#define SECMIN ((unsigned)60) /* seconds per minute */
#define SECHOUR ((unsigned)(60*SECMIN)) /* seconds per hour */
@ -66,6 +68,7 @@ int clockinitted;
int tickfix;
int tickfixinterval;
int wall_cmos_clock; /* wall CMOS clock assumed if != 0 */
static int beeping = 0;
extern int cycles_per_sec;
@ -83,6 +86,15 @@ static struct timecounter alpha_timecounter[3] = {
SYSCTL_OPAQUE(_debug, OID_AUTO, alpha_timecounter, CTLFLAG_RD,
alpha_timecounter, sizeof(alpha_timecounter), "S,timecounter", "");
/* Values for timerX_state: */
#define RELEASED 0
#define RELEASE_PENDING 1
#define ACQUIRED 2
#define ACQUIRE_PENDING 3
/* static u_char timer0_state; */
static u_char timer2_state;
/*
* Algorithm for missed clock ticks from Linux/alpha.
*/
@ -189,6 +201,7 @@ handleclock(void* arg)
hardclock(arg);
}
hardclock(arg);
setdelayed();
}
/*
@ -348,3 +361,75 @@ alpha_get_timecount(struct timecounter* tc)
return alpha_rpcc();
}
int
acquire_timer2(int mode)
{
if (timer2_state != RELEASED)
return (-1);
timer2_state = ACQUIRED;
/*
* This access to the timer registers is as atomic as possible
* because it is a single instruction. We could do better if we
* knew the rate. Use of splclock() limits glitches to 10-100us,
* and this is probably good enough for timer2, so we aren't as
* careful with it as with timer0.
*/
outb(TIMER_MODE, TIMER_SEL2 | (mode & 0x3f));
return (0);
}
int
release_timer2()
{
if (timer2_state != ACQUIRED)
return (-1);
timer2_state = RELEASED;
outb(TIMER_MODE, TIMER_SEL2 | TIMER_SQWAVE | TIMER_16BIT);
return (0);
}
static void
sysbeepstop(void *chan)
{
outb(IO_PPI, inb(IO_PPI)&0xFC); /* disable counter2 output to speaker */
release_timer2();
beeping = 0;
}
/*
* Frequency of all three count-down timers; (TIMER_FREQ/freq) is the
* appropriate count to generate a frequency of freq hz.
*/
#ifndef TIMER_FREQ
#define TIMER_FREQ 1193182
#endif
#define TIMER_DIV(x) ((TIMER_FREQ+(x)/2)/(x))
int
sysbeep(int pitch, int period)
{
int x = splhigh();
if (acquire_timer2(TIMER_SQWAVE|TIMER_16BIT))
if (!beeping) {
/* Something else owns it. */
splx(x);
return (-1); /* XXX Should be EBUSY, but nobody cares anyway. */
}
pitch = TIMER_DIV(pitch);
outb(TIMER_CNTR2, pitch);
outb(TIMER_CNTR2, (pitch>>8));
if (!beeping) {
/* enable counter2 output to speaker */
outb(IO_PPI, inb(IO_PPI) | 3);
beeping = period;
timeout(sysbeepstop, (void *)NULL, period);
}
splx(x);
return (0);
}