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Annotation of kernel/machdep/ppc/ast_ppc.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: /* 
                     26:  * Copyright (c) 1997 Apple Computer, Inc.
                     27:  *
                     28:  * HISTORY
                     29:  *
                     30:  *     [email protected]
                     31:  *     Fixed sleep integration problem. sleep was not properly
                     32:  *     handling thread states of THREAD_INTERRUPTED and 
                     33:  *     THREAD_MUST_TERMINATE, so callers of sleep were getting
                     34:  *     confused and many times looping.  This fixes the (in)famous
                     35:  *     unkillable gdb problem, the PB (and other processes) don't
                     36:  *     terminate, and more. Cleaned up ast code to be just like
                     37:  *  i386 version.
                     38:  *
                     39:  */
                     40: 
                     41: #import <mach/mach_types.h>
                     42: #import <mach/exception.h>
                     43: 
                     44: #import <sys/param.h>
                     45: #import <sys/proc.h>
                     46: #import <sys/user.h>
                     47: #include <kern/ast.h>
                     48: 
                     49: 
                     50: #ifdef MACHINE_AST
                     51: void
                     52: astoff(int mycpu)
                     53: {
                     54:        printf("astoff: turning off needast, cpu=%x\n",mycpu);
                     55: }
                     56: 
                     57: 
                     58: 
                     59: void
                     60: aston(int mycpu)
                     61: {
                     62:        printf("aston: setting needast, cpu=%x\n",mycpu);
                     63: }
                     64: #endif
                     65: 
                     66: 
                     67: 
                     68: void
                     69: check_for_ast(void)
                     70: {
                     71:     thread_t    thread;
                     72:     struct proc        *p;
                     73:     ppc_saved_state_t  *saved_state;
                     74: 
                     75: 
                     76:     thread = current_thread();
                     77:     p = current_proc();
                     78:     saved_state = &thread->pcb->ss;
                     79: 
                     80:     while (TRUE) {
                     81:        ast_t   reasons;
                     82:        int     mycpu = cpu_number();
                     83:        int     signum;
                     84:        
                     85:        reasons = ast_needed(mycpu);
                     86: 
                     87:        if (p) {
                     88:            if ((p->p_flag & P_OWEUPC) && (p->p_flag & P_PROFIL)) {
                     89:                        addupc_task(p, saved_state->srr0, 1);
                     90:                        p->p_flag &= ~P_OWEUPC;
                     91:                }
                     92: 
                     93:            ast_off(mycpu, AST_UNIX);
                     94: 
                     95:            if (CHECK_SIGNALS(p, thread, thread->_uthread)) {
                     96:                        signum = issignal(p);
                     97:                        if (signum) {
                     98:                        postsig(signum);
                     99:                        }
                    100:            }
                    101:        }
                    102: 
                    103:        ast_off(mycpu, reasons);
                    104: 
                    105:        if (thread_should_halt(thread))
                    106:                        thread_halt_self();
                    107:        else if ((reasons & AST_BLOCK) || 
                    108:                csw_needed(thread, current_processor())) {
                    109:                p->p_stats->p_ru.ru_nivcsw++;
                    110:                thread_block_with_continuation(thread_exception_return);
                    111:        }
                    112:        else
                    113:                break;
                    114:     }
                    115:        
                    116: }

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