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  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991,1990 Carnegie Mellon University
  31  * All Rights Reserved.
  32  *
  33  * Permission to use, copy, modify and distribute this software and its
  34  * documentation is hereby granted, provided that both the copyright
  35  * notice and this permission notice appear in all copies of the
  36  * software, derivative works or modified versions, and any portions
  37  * thereof, and that both notices appear in supporting documentation.
  38  *
  39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  42  *
  43  * Carnegie Mellon requests users of this software to return to
  44  *
  45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  46  *  School of Computer Science
  47  *  Carnegie Mellon University
  48  *  Pittsburgh PA 15213-3890
  49  *
  50  * any improvements or extensions that they make and grant Carnegie Mellon
  51  * the rights to redistribute these changes.
  52  */
  53
  54 /*
  55  */
  56
  57 #include <cpus.h>
  58 #include <mp_v1_1.h>
  59
  60 #if NCPUS > 1
  61
  62 #include <types.h>
  63 #include <mach/machine.h>
  64 #include <kern/lock.h>
  65 #include <kern/cpu_data.h>
  66 #include <kern/processor.h>
  67 #include <kern/misc_protos.h>
  68 #include <kern/machine.h>
  69 #include <i386/db_machdep.h>
  70 #include <ddb/db_run.h>
  71 #include <i386/AT386/mp/mp.h>
  72 #include <i386/setjmp.h>
  73 #include <i386/misc_protos.h>
  74
  75 int     cpu_int_word[NCPUS];
  76
  77 extern void cpu_interrupt(int cpu);
  78 extern int get_ncpus(void);
  79
  80 /*
  81  * Generate a clock interrupt on next running cpu
  82  *
  83  * Instead of having the master processor interrupt
  84  * all active processors, each processor in turn interrupts
  85  * the next active one. This avoids all slave processors
  86  * accessing the same R/W data simultaneously.
  87  */
  88
  89 void
  90 slave_clock(void)
  91 {
  92 }
  93
  94 void
  95 i386_signal_cpus(int event)
  96 {
  97 }
  98
  99 /*ARGSUSED*/
 100 void
 101 init_ast_check(
 102         processor_t     processor)
 103 {
 104 }
 105
 106 void
 107 cause_ast_check(
 108         processor_t     processor)
 109 {
 110 }
 111
 112 /*ARGSUSED*/
 113 kern_return_t
 114 cpu_start(
 115         int     slot_num)
 116 {
 117         printf("cpu_start not implemented\n");
 118         return (KERN_FAILURE);
 119 }
 120
 121
 122 int real_ncpus;
 123 int wncpu = -1;
 124
 125 /*
 126  * Find out how many cpus will run
 127  */
 128
 129 void
 130 mp_probe_cpus(void)
 131 {
 132         int i;
 133
 134         /*
 135          * get real number of cpus
 136          */
 137
 138         real_ncpus = get_ncpus();
 139
 140         if (wncpu <= 0)
 141                 wncpu = NCPUS;
 142
 143         /*
 144          * Ignore real number of cpus it if number of requested cpus
 145          * is smaller.
 146          * Keep it if number of requested cpu is null or larger.
 147          */
 148
 149         if (real_ncpus < wncpu)
 150                 wncpu = real_ncpus;
 151 #if     MP_V1_1
 152     {
 153         extern void validate_cpus(int);
 154
 155         /*
 156          * We do NOT have CPUS numbered contiguously.
 157          */
 158
 159         validate_cpus(wncpu);
 160     }
 161 #else
 162         for (i=0; i < wncpu; i++)
 163                 machine_slot[i].is_cpu = TRUE;
 164 #endif
 165 }
 166
 167 /*
 168  * invoke kdb on slave processors
 169  */
 170
 171 void
 172 remote_kdb(void)
 173 {
 174 }
 175
 176 /*
 177  * Clear kdb interrupt
 178  */
 179
 180 void
 181 clear_kdb_intr(void)
 182 {
 183 }
 184 #else /* NCPUS > 1 */
 185 int     cpu_int_word[NCPUS];
 186 #endif /* NCPUS > 1 */