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Add variable `idelayed' and macros setdelayed() and schedsofttty()
to access it. setdelayed() actually ORs the bits in `idelayed' into `ipending' and clears `idelayed'. Call setdelayed() every (normal) clock tick to convert delayed interrupts into pending ones. Drivers can set bits in `idelayed' at any time to schedule an interrupt at the next clock tick. This is more efficient than calling timeout(). Currently only software interrupts can be scheduled.
This commit is contained in:
Bruce Evans
parent
c77a009363
commit
d81fba0cda
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=8448
@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
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* $Id: clock.c,v 1.31 1995/01/19 22:05:27 ats Exp $
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* $Id: clock.c,v 1.32 1995/03/16 18:11:58 bde Exp $
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*/
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/*
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@ -92,6 +92,7 @@
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int adjkerntz = 0; /* offset from CMOS clock */
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int disable_rtc_set = 0; /* disable resettodr() if != 0 */
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u_int idelayed;
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#ifdef I586_CPU
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int pentium_mhz;
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#endif
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@ -124,6 +125,7 @@ void
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clkintr(struct clockframe frame)
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{
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hardclock(&frame);
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setdelayed();
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}
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#else
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void
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@ -132,15 +134,18 @@ clkintr(struct clockframe frame)
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timer_func(&frame);
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switch (timer0_state) {
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case 0:
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setdelayed();
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break;
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case 1:
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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hardclock(&frame);
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setdelayed();
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timer0_prescaler_count -= hardclock_max_count;
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}
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break;
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case 2:
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setdelayed();
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timer0_max_count = TIMER_DIV(new_rate);
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timer0_overflow_threshold =
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timer0_max_count - TIMER0_LATCH_COUNT;
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@ -157,6 +162,7 @@ clkintr(struct clockframe frame)
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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hardclock(&frame);
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setdelayed();
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timer0_max_count = hardclock_max_count;
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timer0_overflow_threshold =
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timer0_max_count - TIMER0_LATCH_COUNT;
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@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
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* $Id: clock.c,v 1.31 1995/01/19 22:05:27 ats Exp $
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* $Id: clock.c,v 1.32 1995/03/16 18:11:58 bde Exp $
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*/
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/*
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@ -92,6 +92,7 @@
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int adjkerntz = 0; /* offset from CMOS clock */
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int disable_rtc_set = 0; /* disable resettodr() if != 0 */
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u_int idelayed;
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#ifdef I586_CPU
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int pentium_mhz;
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#endif
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@ -124,6 +125,7 @@ void
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clkintr(struct clockframe frame)
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{
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hardclock(&frame);
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setdelayed();
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}
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#else
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void
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@ -132,15 +134,18 @@ clkintr(struct clockframe frame)
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timer_func(&frame);
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switch (timer0_state) {
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case 0:
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setdelayed();
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break;
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case 1:
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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hardclock(&frame);
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setdelayed();
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timer0_prescaler_count -= hardclock_max_count;
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}
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break;
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case 2:
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setdelayed();
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timer0_max_count = TIMER_DIV(new_rate);
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timer0_overflow_threshold =
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timer0_max_count - TIMER0_LATCH_COUNT;
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@ -157,6 +162,7 @@ clkintr(struct clockframe frame)
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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hardclock(&frame);
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setdelayed();
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timer0_max_count = hardclock_max_count;
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timer0_overflow_threshold =
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timer0_max_count - TIMER0_LATCH_COUNT;
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@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
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* $Id: clock.c,v 1.31 1995/01/19 22:05:27 ats Exp $
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* $Id: clock.c,v 1.32 1995/03/16 18:11:58 bde Exp $
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*/
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/*
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@ -92,6 +92,7 @@
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int adjkerntz = 0; /* offset from CMOS clock */
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int disable_rtc_set = 0; /* disable resettodr() if != 0 */
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u_int idelayed;
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#ifdef I586_CPU
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int pentium_mhz;
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#endif
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@ -124,6 +125,7 @@ void
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clkintr(struct clockframe frame)
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{
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hardclock(&frame);
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setdelayed();
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}
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#else
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void
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@ -132,15 +134,18 @@ clkintr(struct clockframe frame)
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timer_func(&frame);
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switch (timer0_state) {
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case 0:
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setdelayed();
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break;
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case 1:
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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hardclock(&frame);
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setdelayed();
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timer0_prescaler_count -= hardclock_max_count;
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}
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break;
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case 2:
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setdelayed();
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timer0_max_count = TIMER_DIV(new_rate);
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timer0_overflow_threshold =
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timer0_max_count - TIMER0_LATCH_COUNT;
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@ -157,6 +162,7 @@ clkintr(struct clockframe frame)
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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hardclock(&frame);
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setdelayed();
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timer0_max_count = hardclock_max_count;
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timer0_overflow_threshold =
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timer0_max_count - TIMER0_LATCH_COUNT;
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@ -30,7 +30,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: spl.h,v 1.6 1994/12/30 12:42:15 bde Exp $
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* $Id: spl.h,v 1.7 1995/05/11 00:13:01 wollman Exp $
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*/
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#ifndef _MACHINE_IPL_H_
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@ -74,6 +74,7 @@
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extern unsigned bio_imask; /* group of interrupts masked with splbio() */
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extern unsigned cpl; /* current priority level mask */
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extern volatile unsigned idelayed; /* interrupts to become pending */
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extern volatile unsigned ipending; /* active interrupts masked by cpl */
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extern unsigned net_imask; /* group of interrupts masked with splimp() */
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extern unsigned stat_imask; /* interrupts masked with splstatclock() */
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@ -85,11 +86,14 @@ extern unsigned tty_imask; /* group of interrupts masked with spltty() */
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* it is changed. Pretending that ipending is a plain int happens to give
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* suitable atomic code for "ipending |= constant;".
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*/
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#define setdelayed() (*(unsigned *)&ipending |= loadandclear(&idelayed))
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#define setsoftast() (*(unsigned *)&ipending |= SWI_AST_PENDING)
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#define setsoftclock() (*(unsigned *)&ipending |= SWI_CLOCK_PENDING)
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#define setsoftnet() (*(unsigned *)&ipending |= SWI_NET_PENDING)
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#define setsofttty() (*(unsigned *)&ipending |= SWI_TTY_PENDING)
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#define schedsofttty() (*(unsigned *)&idelayed |= SWI_TTY_PENDING)
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void unpend_V __P((void));
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#ifdef __GNUC__
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@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
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* $Id: clock.c,v 1.31 1995/01/19 22:05:27 ats Exp $
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* $Id: clock.c,v 1.32 1995/03/16 18:11:58 bde Exp $
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*/
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/*
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@ -92,6 +92,7 @@
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int adjkerntz = 0; /* offset from CMOS clock */
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int disable_rtc_set = 0; /* disable resettodr() if != 0 */
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u_int idelayed;
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#ifdef I586_CPU
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int pentium_mhz;
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#endif
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@ -124,6 +125,7 @@ void
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clkintr(struct clockframe frame)
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{
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hardclock(&frame);
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setdelayed();
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}
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#else
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void
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@ -132,15 +134,18 @@ clkintr(struct clockframe frame)
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timer_func(&frame);
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switch (timer0_state) {
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case 0:
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setdelayed();
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break;
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case 1:
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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hardclock(&frame);
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setdelayed();
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timer0_prescaler_count -= hardclock_max_count;
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}
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break;
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case 2:
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setdelayed();
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timer0_max_count = TIMER_DIV(new_rate);
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timer0_overflow_threshold =
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timer0_max_count - TIMER0_LATCH_COUNT;
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@ -157,6 +162,7 @@ clkintr(struct clockframe frame)
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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hardclock(&frame);
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setdelayed();
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timer0_max_count = hardclock_max_count;
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timer0_overflow_threshold =
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timer0_max_count - TIMER0_LATCH_COUNT;
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@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
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* $Id: clock.c,v 1.31 1995/01/19 22:05:27 ats Exp $
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* $Id: clock.c,v 1.32 1995/03/16 18:11:58 bde Exp $
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*/
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/*
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@ -92,6 +92,7 @@
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int adjkerntz = 0; /* offset from CMOS clock */
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int disable_rtc_set = 0; /* disable resettodr() if != 0 */
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u_int idelayed;
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#ifdef I586_CPU
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int pentium_mhz;
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#endif
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@ -124,6 +125,7 @@ void
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clkintr(struct clockframe frame)
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{
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hardclock(&frame);
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setdelayed();
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}
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#else
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void
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@ -132,15 +134,18 @@ clkintr(struct clockframe frame)
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timer_func(&frame);
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switch (timer0_state) {
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case 0:
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setdelayed();
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break;
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case 1:
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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hardclock(&frame);
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setdelayed();
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timer0_prescaler_count -= hardclock_max_count;
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}
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break;
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case 2:
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setdelayed();
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timer0_max_count = TIMER_DIV(new_rate);
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timer0_overflow_threshold =
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timer0_max_count - TIMER0_LATCH_COUNT;
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@ -157,6 +162,7 @@ clkintr(struct clockframe frame)
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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hardclock(&frame);
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setdelayed();
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timer0_max_count = hardclock_max_count;
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timer0_overflow_threshold =
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timer0_max_count - TIMER0_LATCH_COUNT;
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