osfmk/i386/AT386/mp/mp.c

   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  Software.Distribution@CS.CMU.EDU
  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 */