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callout(9): Remove some leftover APM BIOS support

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This code is obsolete since r366546.

Reviewed by:	imp
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D27267
This commit is contained in:
Mark Johnston 2020-11-27 20:46:02 +00:00
parent 1def0a6257
commit 0c56925bc2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=368112
2 changed files with 0 additions and 70 deletions
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65
sys/kern/kern_timeout.c
View file

@ -1339,71 +1339,6 @@ _callout_init_lock(struct callout *c, struct lock_object *lock, int flags)
c->c_cpu = cc_default_cpu;
}
#ifdef APM_FIXUP_CALLTODO
/*
* Adjust the kernel calltodo timeout list. This routine is used after
* an APM resume to recalculate the calltodo timer list values with the
* number of hz's we have been sleeping. The next hardclock() will detect
* that there are fired timers and run softclock() to execute them.
*
* Please note, I have not done an exhaustive analysis of what code this
* might break. I am motivated to have my select()'s and alarm()'s that
* have expired during suspend firing upon resume so that the applications
* which set the timer can do the maintanence the timer was for as close
* as possible to the originally intended time. Testing this code for a
* week showed that resuming from a suspend resulted in 22 to 25 timers
* firing, which seemed independent on whether the suspend was 2 hours or
* 2 days. Your milage may vary. - Ken Key <key@cs.utk.edu>
*/
void
adjust_timeout_calltodo(struct timeval *time_change)
{
struct callout *p;
unsigned long delta_ticks;
/*
* How many ticks were we asleep?
* (stolen from tvtohz()).
*/
/* Don't do anything */
if (time_change->tv_sec < 0)
return;
else if (time_change->tv_sec <= LONG_MAX / 1000000)
delta_ticks = howmany(time_change->tv_sec * 1000000 +
time_change->tv_usec, tick) + 1;
else if (time_change->tv_sec <= LONG_MAX / hz)
delta_ticks = time_change->tv_sec * hz +
howmany(time_change->tv_usec, tick) + 1;
else
delta_ticks = LONG_MAX;
if (delta_ticks > INT_MAX)
delta_ticks = INT_MAX;
/*
* Now rip through the timer calltodo list looking for timers
* to expire.
*/
/* don't collide with softclock() */
CC_LOCK(cc);
for (p = calltodo.c_next; p != NULL; p = p->c_next) {
p->c_time -= delta_ticks;
/* Break if the timer had more time on it than delta_ticks */
if (p->c_time > 0)
break;
/* take back the ticks the timer didn't use (p->c_time <= 0) */
delta_ticks = -p->c_time;
}
CC_UNLOCK(cc);
return;
}
#endif /* APM_FIXUP_CALLTODO */
static int
flssbt(sbintime_t sbt)
{

5
sys/sys/systm.h
View file

@ -482,11 +482,6 @@ extern cpu_tick_f *cpu_ticks;
uint64_t cpu_tickrate(void);
uint64_t cputick2usec(uint64_t tick);
#ifdef APM_FIXUP_CALLTODO
struct timeval;
void adjust_timeout_calltodo(struct timeval *time_change);
#endif /* APM_FIXUP_CALLTODO */
#include <sys/libkern.h>
/* Initialize the world */