The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/idt/idt_machdep.c

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    1 /*-
    2  * Copyright (C) 2007 by Oleksandr Tymoshenko. All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   16  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
   17  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   19  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   21  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
   22  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   23  * THE POSSIBILITY OF SUCH DAMAGE.
   24  *
   25  * $Id: $
   26  * 
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/8.1/sys/mips/idt/idt_machdep.c 178173 2008-04-13 07:44:55Z imp $");
   31 
   32 #include "opt_ddb.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/conf.h>
   36 #include <sys/kernel.h>
   37 #include <sys/systm.h>
   38 #include <sys/imgact.h>
   39 #include <sys/bio.h>
   40 #include <sys/buf.h>
   41 #include <sys/bus.h>
   42 #include <sys/cpu.h>
   43 #include <sys/cons.h>
   44 #include <sys/exec.h>
   45 #include <sys/ucontext.h>
   46 #include <sys/proc.h>
   47 #include <sys/kdb.h>
   48 #include <sys/ptrace.h>
   49 #include <sys/reboot.h>
   50 #include <sys/signalvar.h>
   51 #include <sys/sysent.h>
   52 #include <sys/sysproto.h>
   53 #include <sys/user.h>
   54 
   55 #include <vm/vm.h>
   56 #include <vm/vm_object.h>
   57 #include <vm/vm_page.h>
   58 #include <vm/vm_pager.h>
   59 
   60 #include <machine/cache.h>
   61 #include <machine/clock.h>
   62 #include <machine/cpu.h>
   63 #include <machine/cpuinfo.h>
   64 #include <machine/cpufunc.h>
   65 #include <machine/cpuregs.h>
   66 #include <machine/hwfunc.h>
   67 #include <machine/intr_machdep.h>
   68 #include <machine/locore.h>
   69 #include <machine/md_var.h>
   70 #include <machine/pte.h>
   71 #include <machine/sigframe.h>
   72 #include <machine/trap.h>
   73 #include <machine/vmparam.h>
   74 
   75 extern int      *edata;
   76 extern int      *end;
   77 
   78 void
   79 platform_halt(void)
   80 {
   81 
   82 }
   83 
   84 
   85 void
   86 platform_identify(void)
   87 {
   88 
   89 }
   90 
   91 void
   92 platform_reset(void)
   93 {
   94         volatile unsigned int * p = (void *)0xb8008000;
   95         /* 
   96          * TODO: we should take care of TLB stuff here. Otherwise
   97          * board does not boots properly next time
   98          */
   99 
  100         /* Write 0x8000_0001 to the Reset register */
  101         *p = 0x80000001;
  102 
  103         __asm __volatile("li    $25, 0xbfc00000");
  104         __asm __volatile("j     $25");
  105 }
  106 
  107 void
  108 platform_trap_enter(void)
  109 {
  110 
  111 }
  112 
  113 void
  114 platform_trap_exit(void)
  115 {
  116 
  117 }
  118 
  119 void
  120 platform_start(__register_t a0, __register_t a1,
  121     __register_t a2 __unused, __register_t a3 __unused)
  122 {
  123         uint64_t platform_counter_freq;
  124         vm_offset_t kernend;
  125         int argc = a0;
  126         char **argv = (char **)a1;
  127         int i, mem;
  128 
  129 
  130         /* clear the BSS and SBSS segments */
  131         kernend = round_page((vm_offset_t)&end);
  132         memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  133 
  134         /*
  135          * Looking for mem=XXM argument
  136          */
  137         mem = 0; /* Just something to start with */
  138         for (i=0; i < argc; i++) {
  139                 if (strncmp(argv[i], "mem=", 4) == 0) {
  140                         mem = strtol(argv[i] + 4, NULL, 0);
  141                         break;
  142                 }
  143         }
  144 
  145         bootverbose = 1;
  146         if (mem > 0)
  147                 realmem = btoc(mem << 20);
  148         else
  149                 realmem = btoc(32 << 20);
  150 
  151         for (i = 0; i < 10; i++) {
  152                 phys_avail[i] = 0;
  153         }
  154 
  155         /* phys_avail regions are in bytes */
  156         phys_avail[0] = MIPS_KSEG0_TO_PHYS((vm_offset_t)&end);
  157         phys_avail[1] = ctob(realmem);
  158 
  159         physmem = realmem;
  160 
  161         /* 
  162          * ns8250 uart code uses DELAY so ticker should be inititalized 
  163          * before cninit. And tick_init_params refers to hz, so * init_param1 
  164          * should be called first.
  165          */
  166         init_param1();
  167         /* TODO: parse argc,argv */
  168         platform_counter_freq = 330000000UL;
  169         mips_timer_init_params(platform_counter_freq, 1);
  170         cninit();
  171         /* Panic here, after cninit */ 
  172         if (mem == 0)
  173                 panic("No mem=XX parameter in arguments");
  174 
  175         printf("cmd line: ");
  176         for (i=0; i < argc; i++)
  177                 printf("%s ", argv[i]);
  178         printf("\n");
  179 
  180         init_param2(physmem);
  181         mips_cpu_init();
  182         pmap_bootstrap();
  183         mips_proc0_init();
  184         mutex_init();
  185 #ifdef DDB
  186         kdb_init();
  187 #endif
  188 }

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