sys/arch/hpcmips/stand/pbsdboot/mips.c

   1 /*      $NetBSD: mips.c,v 1.3 2000/01/16 03:07:32 takemura Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1999 Shin Takemura.
   5  * All rights reserved.
   6  *
   7  * This software is part of the PocketBSD.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the PocketBSD project
  20  *      and its contributors.
  21  * 4. Neither the name of the project nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  */
  38 #include <pbsdboot.h>
  39
  40 #define DUMMYBUFSIZE    (1024*32)
  41 int dummy_buf[DUMMYBUFSIZE];
  42
  43 int
  44 mips_boot(void *map)
  45 {
  46         unsigned char *mem;
  47         unsigned long jump_instruction, phys_mem;
  48         int i, j;
  49
  50         /*
  51          *  allocate physical memory for startup program.
  52          */
  53         if ((mem = (unsigned char*)vmem_alloc()) == NULL) {
  54                 msg_printf(MSG_ERROR, whoami, TEXT("Can't allocate root page.\n"));
  55                 return -1;
  56         }
  57
  58         /*
  59          *  copy startup program code
  60          */
  61         memcpy(mem, system_info.si_asmcode, system_info.si_asmcodelen);
  62
  63         /*
  64          *  set map address (override target field of asmcode
  65          *  "lui a0, 0x0; ori a0, 0x0;".
  66          */
  67         *(unsigned short*)&mem[0] = (unsigned short)(((long)map) >> 16);
  68         *(unsigned short*)&mem[4] = (unsigned short)map;
  69
  70         /*
  71          *  construct start instruction
  72          */
  73         if (!(phys_mem = (unsigned long)vtophysaddr(mem))) {
  74                 msg_printf(MSG_ERROR, whoami, TEXT("Missing physical page.\n"));
  75                 return -1;
  76         }
  77         jump_instruction = (0x08000000 | ((phys_mem >> 2) & 0x03ffffff));
  78
  79         /*
  80          *  map interrupt vector
  81          */
  82         mem = (unsigned char*)VirtualAlloc(0, 0x400, MEM_RESERVE, PAGE_NOACCESS);
  83         if (!(VirtualCopy((LPVOID)mem, (LPVOID)(system_info.si_dramstart >> 8), 0x400,
  84                           PAGE_READWRITE | PAGE_NOCACHE | PAGE_PHYSICAL))) {
  85                 msg_printf(MSG_ERROR, whoami, TEXT("Mapping interrupt vector failed.\n"));
  86                 return -1;
  87         }
  88
  89         /*
  90          *  Flush D-cache
  91          */
  92         for (i = 0; i < DUMMYBUFSIZE; i++) {
  93                 dummy_buf[i] = j;
  94         }
  95         for (i = 0; i < DUMMYBUFSIZE; i++) {
  96                 j = dummy_buf[i];
  97                 j++;
  98         }
  99         /*
 100          *  Flush I-cache
 101          */
 102         __asm(".space 32768;");
 103
 104         /*
 105          *  GO !
 106          */
 107         *(unsigned long*)&mem[system_info.si_intrvec] = jump_instruction;
 108
 109         return (0); /* not reachable */
 110 }