kernel/generic/src/cpu/cpu.c

   1  /*
   2  * Copyright (c) 2001-2004 Jakub Jermar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup generic
  30  * @{
  31  */
  32
  33 /**
  34  * @file
  35  * @brief       CPU subsystem initialization and listing.
  36  */
  37
  38 #include <cpu.h>
  39 #include <arch.h>
  40 #include <arch/cpu.h>
  41 #include <mm/slab.h>
  42 #include <mm/page.h>
  43 #include <mm/frame.h>
  44 #include <arch/types.h>
  45 #include <config.h>
  46 #include <panic.h>
  47 #include <typedefs.h>
  48 #include <memstr.h>
  49 #include <adt/list.h>
  50 #include <print.h>
  51
  52 cpu_t *cpus;
  53
  54 /** Initialize CPUs
  55  *
  56  * Initialize kernel CPUs support.
  57  *
  58  */
  59 void cpu_init(void) {
  60         int i, j;
  61
  62 #ifdef CONFIG_SMP
  63         if (config.cpu_active == 1) {
  64 #endif /* CONFIG_SMP */
  65                 cpus = (cpu_t *) malloc(sizeof(cpu_t) * config.cpu_count,
  66                                         FRAME_ATOMIC);
  67                 if (!cpus)
  68                         panic("malloc/cpus");
  69
  70                 /* initialize everything */
  71                 memsetb((uintptr_t) cpus, sizeof(cpu_t) * config.cpu_count, 0);
  72
  73                 for (i=0; i < config.cpu_count; i++) {
  74                         cpus[i].stack = (uint8_t *) frame_alloc(STACK_FRAMES, FRAME_KA | FRAME_ATOMIC);
  75
  76                         cpus[i].id = i;
  77
  78                         spinlock_initialize(&cpus[i].lock, "cpu_t.lock");
  79
  80                         for (j = 0; j < RQ_COUNT; j++) {
  81                                 spinlock_initialize(&cpus[i].rq[j].lock, "rq_t.lock");
  82                                 list_initialize(&cpus[i].rq[j].rq_head);
  83                         }
  84                 }
  85
  86 #ifdef CONFIG_SMP
  87         }
  88 #endif /* CONFIG_SMP */
  89
  90         CPU = &cpus[config.cpu_active-1];
  91
  92         CPU->active = 1;
  93         CPU->tlb_active = 1;
  94
  95         cpu_identify();
  96         cpu_arch_init();
  97 }
  98
  99 /** List all processors. */
 100 void cpu_list(void)
 101 {
 102         int i;
 103
 104         for (i = 0; i < config.cpu_count; i++) {
 105                 if (cpus[i].active)
 106                         cpu_print_report(&cpus[i]);
 107                 else
 108                         printf("cpu%d: not active\n", i);
 109         }
 110 }
 111
 112 /** @}
 113  */
 114