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Annotation of XNU/osfmk/i386/AT386/mp/mp.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * @OSF_COPYRIGHT@
        !            24:  */
        !            25: /* 
        !            26:  * Mach Operating System
        !            27:  * Copyright (c) 1991,1990 Carnegie Mellon University
        !            28:  * All Rights Reserved.
        !            29:  * 
        !            30:  * Permission to use, copy, modify and distribute this software and its
        !            31:  * documentation is hereby granted, provided that both the copyright
        !            32:  * notice and this permission notice appear in all copies of the
        !            33:  * software, derivative works or modified versions, and any portions
        !            34:  * thereof, and that both notices appear in supporting documentation.
        !            35:  * 
        !            36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            39:  * 
        !            40:  * Carnegie Mellon requests users of this software to return to
        !            41:  * 
        !            42:  *  Software Distribution Coordinator  or  [email protected]
        !            43:  *  School of Computer Science
        !            44:  *  Carnegie Mellon University
        !            45:  *  Pittsburgh PA 15213-3890
        !            46:  * 
        !            47:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            48:  * the rights to redistribute these changes.
        !            49:  */
        !            50: 
        !            51: /*
        !            52:  */
        !            53: 
        !            54: #include <cpus.h>
        !            55: #include <mp_v1_1.h>
        !            56: 
        !            57: #if NCPUS > 1
        !            58: 
        !            59: #include <types.h>
        !            60: #include <mach/machine.h>
        !            61: #include <kern/lock.h>
        !            62: #include <kern/cpu_data.h>
        !            63: #include <kern/processor.h>
        !            64: #include <kern/misc_protos.h>
        !            65: #include <kern/machine.h>
        !            66: #include <i386/db_machdep.h>
        !            67: #include <ddb/db_run.h>
        !            68: #include <i386/AT386/mp/mp.h>
        !            69: #include <i386/setjmp.h>
        !            70: #include <i386/misc_protos.h>
        !            71: 
        !            72: int    cpu_int_word[NCPUS];
        !            73: 
        !            74: extern void cpu_interrupt(int cpu);
        !            75: extern int get_ncpus(void);
        !            76: 
        !            77: /*
        !            78:  * Generate a clock interrupt on next running cpu
        !            79:  *
        !            80:  * Instead of having the master processor interrupt
        !            81:  * all active processors, each processor in turn interrupts
        !            82:  * the next active one. This avoids all slave processors
        !            83:  * accessing the same R/W data simultaneously.
        !            84:  */
        !            85: 
        !            86: void
        !            87: slave_clock(void)
        !            88: {
        !            89: }
        !            90: 
        !            91: void
        !            92: i386_signal_cpus(int event)
        !            93: {
        !            94: }
        !            95: 
        !            96: /*ARGSUSED*/
        !            97: void
        !            98: init_ast_check(
        !            99:        processor_t     processor)
        !           100: {
        !           101: }
        !           102: 
        !           103: void
        !           104: cause_ast_check(
        !           105:        processor_t     processor)
        !           106: {
        !           107: }
        !           108: 
        !           109: /*ARGSUSED*/
        !           110: kern_return_t
        !           111: cpu_start(
        !           112:        int     slot_num)
        !           113: {
        !           114:        printf("cpu_start not implemented\n");
        !           115:        return (KERN_FAILURE);
        !           116: }
        !           117: 
        !           118: 
        !           119: int real_ncpus;
        !           120: int wncpu = -1;
        !           121: 
        !           122: /*
        !           123:  * Find out how many cpus will run
        !           124:  */
        !           125:  
        !           126: void
        !           127: mp_probe_cpus(void)
        !           128: {
        !           129:        int i;
        !           130: 
        !           131:        /* 
        !           132:         * get real number of cpus
        !           133:         */
        !           134: 
        !           135:        real_ncpus = get_ncpus();
        !           136: 
        !           137:        if (wncpu <= 0)
        !           138:                wncpu = NCPUS;
        !           139: 
        !           140:        /*
        !           141:         * Ignore real number of cpus it if number of requested cpus
        !           142:         * is smaller.
        !           143:         * Keep it if number of requested cpu is null or larger.
        !           144:         */
        !           145: 
        !           146:        if (real_ncpus < wncpu)
        !           147:                wncpu = real_ncpus;
        !           148: #if    MP_V1_1
        !           149:     {
        !           150:        extern void validate_cpus(int);
        !           151: 
        !           152:        /*
        !           153:         * We do NOT have CPUS numbered contiguously.
        !           154:         */
        !           155:        
        !           156:        validate_cpus(wncpu);
        !           157:     }
        !           158: #else
        !           159:        for (i=0; i < wncpu; i++)
        !           160:                machine_slot[i].is_cpu = TRUE;
        !           161: #endif
        !           162: }
        !           163: 
        !           164: /*
        !           165:  * invoke kdb on slave processors 
        !           166:  */
        !           167: 
        !           168: void
        !           169: remote_kdb(void)
        !           170: {
        !           171: }
        !           172: 
        !           173: /*
        !           174:  * Clear kdb interrupt
        !           175:  */
        !           176: 
        !           177: void
        !           178: clear_kdb_intr(void)
        !           179: {
        !           180: }
        !           181: #else /* NCPUS > 1 */
        !           182: int    cpu_int_word[NCPUS];
        !           183: #endif /* NCPUS > 1 */

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