21144e2fde
other schedsoft*() functions since they have never been used. Removed confused comment about not needing these functions. The functions delay scheduling of SWIs until the next hardclock tick. For devices that only deliver a few characters per interrupt, this reduces the number of calls to the scheduler by a large factor (about 115 for each sio port at 115200 bps).
99 lines
3.4 KiB
C
99 lines
3.4 KiB
C
/*-
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* Copyright (c) 1997 Bruce Evans.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <machine/ipl.h>
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#include <sys/proc.h>
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#include <i386/isa/icu.h>
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#include <i386/isa/intr_machdep.h>
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/*
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* Bits in the ipending bitmap variable must be set atomically because
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* ipending may be manipulated by interrupts or other cpu's without holding
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* any locks.
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*
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* Note: setbits uses a locked or, making simple cases MP safe.
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*/
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#define DO_SETBITS(name, var, bits) \
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void name(void) \
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{ \
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atomic_set_int(var, bits); \
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sched_ithd((void *) SOFTINTR); \
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}
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#define DO_SETBITS_AND_NO_MORE(name, var, bits) \
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void name(void) \
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{ \
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atomic_set_int(var, bits); \
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}
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DO_SETBITS(setdelayed, &spending, loadandclear(&idelayed))
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DO_SETBITS(setsoftcamnet,&spending, SWI_CAMNET_PENDING)
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DO_SETBITS(setsoftcambio,&spending, SWI_CAMBIO_PENDING)
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DO_SETBITS(setsoftclock, &spending, SWI_CLOCK_PENDING)
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DO_SETBITS(setsoftnet, &spending, SWI_NET_PENDING)
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DO_SETBITS(setsofttty, &spending, SWI_TTY_PENDING)
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DO_SETBITS(setsoftvm, &spending, SWI_VM_PENDING)
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DO_SETBITS(setsofttq, &spending, SWI_TQ_PENDING)
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DO_SETBITS_AND_NO_MORE(schedsofttty, &idelayed, SWI_TTY_PENDING)
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unsigned
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softclockpending(void)
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{
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return (spending & SWI_CLOCK_PENDING);
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}
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/*
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* Dummy spl calls. The only reason for these is to not break
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* all the code which expects to call them.
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*/
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void spl0 (void) {}
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void splx (intrmask_t x) {}
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intrmask_t splq(intrmask_t mask) {return 0; }
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intrmask_t splbio(void) {return 0; }
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intrmask_t splcam(void) {return 0; }
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intrmask_t splclock(void) {return 0; }
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intrmask_t splhigh(void) {return 0; }
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intrmask_t splimp(void) {return 0; }
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intrmask_t splnet(void) {return 0; }
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intrmask_t splsoftcam(void) {return 0; }
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intrmask_t splsoftcambio(void) {return 0; }
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intrmask_t splsoftcamnet(void) {return 0; }
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intrmask_t splsoftclock(void) {return 0; }
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intrmask_t splsofttty(void) {return 0; }
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intrmask_t splsoftvm(void) {return 0; }
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intrmask_t splsofttq(void) {return 0; }
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intrmask_t splstatclock(void) {return 0; }
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intrmask_t spltty(void) {return 0; }
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intrmask_t splvm(void) {return 0; }
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