126 lines
3.3 KiB
C
126 lines
3.3 KiB
C
/* $NetBSD: ast.c,v 1.1 2001/03/06 07:52:35 matt 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 "opt_ddb.h"
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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 <sys/vmmeter.h>
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#include <machine/cpu.h>
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#include <machine/frame.h>
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#include <machine/cpu.h>
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#include <machine/cpufunc.h>
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#include <machine/psl.h>
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#include <uvm/uvm_extern.h>
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int want_resched = 0;
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void
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userret(p)
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struct proc *p;
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{
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int sig;
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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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curcpu()->ci_schedstate.spc_curpriority = p->p_priority = p->p_usrpri;
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#ifdef DEBUG
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if (current_spl_level != _SPL_0) {
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printf("userret: spl level=%d on exit\n", current_spl_level);
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#ifdef DDB
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Debugger();
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#endif /* DDB */
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}
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#endif /* DEBUG */
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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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struct proc *p = curproc;
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uvmexp.traps++;
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uvmexp.softs++;
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#ifdef DEBUG
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if (p == NULL)
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panic("ast: no curproc!");
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if (&p->p_addr->u_pcb == 0)
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panic("ast: no pcb!");
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if ((GetCPSR() & PSR_MODE) != PSR_SVC32_MODE)
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panic("ast: not in SVC32 mode");
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#endif
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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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/* Allow a forced task switch. */
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if (want_resched)
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preempt(NULL);
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userret(p);
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}
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/* End of ast.c */
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