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) 41int dummy_buf[DUMMYBUFSIZE]; 42 43int 44mips_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} 111