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Annotation of sys/arch/arm/arm/ast.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: ast.c,v 1.8 2007/05/14 07:07:09 art Exp $     */
                      2: /*     $NetBSD: ast.c,v 1.6 2003/10/31 16:44:34 cl Exp $       */
                      3:
                      4: /*
                      5:  * Copyright (c) 1994,1995 Mark Brinicombe
                      6:  * All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by the RiscBSD team.
                     19:  * 4. The name of the company nor the name of the author may be used to
                     20:  *    endorse or promote products derived from this software without specific
                     21:  *    prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
                     24:  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
                     25:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     26:  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTERS BE LIABLE FOR ANY DIRECT,
                     27:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
                     28:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
                     29:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  *
                     35:  * RiscBSD kernel project
                     36:  *
                     37:  * ast.c
                     38:  *
                     39:  * Code to handle ast's and returns to user mode
                     40:  *
                     41:  * Created      : 11/10/94
                     42:  */
                     43:
                     44: #include <sys/param.h>
                     45: #include <sys/proc.h>
                     46: #include <sys/user.h>
                     47: #include <sys/acct.h>
                     48: #include <sys/systm.h>
                     49: #include <sys/kernel.h>
                     50: #include <sys/signal.h>
                     51: #include <sys/signalvar.h>
                     52: #include <sys/vmmeter.h>
                     53:
                     54: #include <machine/cpu.h>
                     55: #include <machine/frame.h>
                     56: #include <machine/cpu.h>
                     57:
                     58: #include <arm/cpufunc.h>
                     59:
                     60: #include <uvm/uvm_extern.h>
                     61:
                     62: #ifdef acorn26
                     63: #include <machine/machdep.h>
                     64: #endif
                     65:
                     66: /*
                     67:  * Prototypes
                     68:  */
                     69: void ast(struct trapframe *);
                     70:
                     71: int want_resched;
                     72: extern int astpending;
                     73:
                     74: void
                     75: userret(struct proc *p)
                     76: {
                     77:        int sig;
                     78:
                     79:        /* Take pending signals. */
                     80:        while ((sig = (CURSIG(p))) != 0)
                     81:                postsig(sig);
                     82:
                     83:        p->p_cpu->ci_schedstate.spc_curpriority = p->p_priority = p->p_usrpri;
                     84: }
                     85:
                     86:
                     87: /*
                     88:  * Handle asynchronous system traps.
                     89:  * This is called from the irq handler to deliver signals
                     90:  * and switch processes if required.
                     91:  */
                     92:
                     93: void
                     94: ast(struct trapframe *tf)
                     95: {
                     96:        struct proc *p = curproc;
                     97:
                     98: #ifdef acorn26
                     99:        /* Enable interrupts if they were enabled before the trap. */
                    100:        if ((tf->tf_r15 & R15_IRQ_DISABLE) == 0)
                    101:                int_on();
                    102: #else
                    103:        /* Interrupts were restored by exception_exit. */
                    104: #endif
                    105:
                    106:        uvmexp.traps++;
                    107:        uvmexp.softs++;
                    108:
                    109: #ifdef DEBUG
                    110:        if (p == NULL)
                    111:                panic("ast: no curproc!");
                    112:        if (&p->p_addr->u_pcb == 0)
                    113:                panic("ast: no pcb!");
                    114: #endif
                    115:
                    116:        if (p->p_flag & P_OWEUPC) {
                    117:                ADDUPROF(p);
                    118:        }
                    119:
                    120:        /* Allow a forced task switch. */
                    121:        if (want_resched)
                    122:                preempt(NULL);
                    123:
                    124:        userret(p);
                    125: }
                    126:
                    127: /* End of ast.c */