169 lines
4.3 KiB
C
169 lines
4.3 KiB
C
/* $NetBSD: ast.c,v 1.2 1996/03/08 18:54:55 mark Exp $ */
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/*
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* Copyright (c) 1994,1995 Mark Brinicombe
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the RiscBSD team.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTERS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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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* RiscBSD kernel project
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*
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* ast.c
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*
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* Code to handle ast's and returns to user mode
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*
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* Created : 11/10/94
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*/
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include <sys/acct.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/signal.h>
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#include <machine/cpu.h>
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#include <machine/frame.h>
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#include <machine/katelib.h>
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#include <machine/psl.h>
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int want_resched = 0;
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void
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userret(p, pc, oticks)
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register struct proc *p;
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int pc;
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u_quad_t oticks;
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{
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int sig, s;
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if (p == NULL)
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panic("userret: p=0 curproc=%08x", curproc);
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#ifdef DIAGNOSTIC
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if ((GetCPSR() & PSR_MODE) != PSR_SVC32_MODE) {
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traceback();
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panic("userret called in non SVC mode !");
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}
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if (current_spl_level != SPL_0)
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printf("WARNING: (1) current spl level=%d\n", current_spl_level);
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#endif
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/* take pending signals */
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while ((sig = (CURSIG(p))) != 0) {
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postsig(sig);
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}
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p->p_priority = p->p_usrpri;
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/*
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* Check for reschedule request
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*/
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if (want_resched) {
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/*
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* Since we are curproc, a clock interrupt could
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* change our priority without changing run queues
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* (the running process is not kept on a run queue).
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* If this happened after we setrunqueue ourselves but
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* before we switch()'ed, we might not be on the queue
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* indicated by our priority
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*/
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s = splstatclock();
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setrunqueue(p);
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p->p_stats->p_ru.ru_nivcsw++;
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mi_switch();
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(void)splx(s);
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while ((sig = (CURSIG(p))) != 0) {
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postsig(sig);
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}
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}
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/*
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* Not sure if this profiling bit is working yet ... Not been tested
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*/
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if (p->p_flag & P_PROFIL) {
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extern int psratio;
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addupc_task(p, pc, (int)(p->p_sticks - oticks) * psratio);
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}
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curpriority = p->p_priority;
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#ifdef DIAGNOSTIC
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if (current_spl_level != SPL_0)
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printf("WARNING: (2) current spl level=%d\n", current_spl_level);
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#endif
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}
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/*
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* void ast(trapframe_t *frame)
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*
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* Handle asynchronous system traps.
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* This is called from the irq handler to deliver signals
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* and switch processes if required.
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* userret() does all the signal delivery and process switching work
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*/
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void
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ast(frame)
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trapframe_t *frame;
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{
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register struct proc *p;
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cnt.v_trap++;
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if ((p = curproc) == 0)
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p = &proc0;
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if (&p->p_addr->u_pcb == 0)
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panic("ast: nopcb!");
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cnt.v_soft++;
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if (p->p_flag & P_OWEUPC) {
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p->p_flag &= ~P_OWEUPC;
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ADDUPROF(p);
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}
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#ifdef VALIDATE_TRAPFRAME
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validate_trapframe(frame, 3);
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#endif
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userret(p, frame->tf_pc, p->p_sticks);
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#ifdef VALIDATE_TRAPFRAME
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validate_trapframe(frame, 3);
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#endif
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}
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/* End of ast.c */
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