111 lines
3.4 KiB
C
111 lines
3.4 KiB
C
/* $NetBSD: mips.c,v 1.3 2000/01/16 03:07:32 takemura Exp $ */
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/*-
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* Copyright (c) 1999 Shin Takemura.
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* All rights reserved.
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*
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* This software is part of the PocketBSD.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the PocketBSD project
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* and its contributors.
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* 4. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <pbsdboot.h>
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#define DUMMYBUFSIZE (1024*32)
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int dummy_buf[DUMMYBUFSIZE];
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int
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mips_boot(caddr_t map)
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{
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unsigned char *mem;
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unsigned long jump_instruction, phys_mem;
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int i, j;
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/*
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* allocate physical memory for startup program.
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*/
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if ((mem = (unsigned char*)vmem_alloc()) == NULL) {
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msg_printf(MSG_ERROR, whoami, TEXT("Can't allocate root page.\n"));
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return -1;
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}
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/*
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* copy startup program code
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*/
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memcpy(mem, system_info.si_asmcode, system_info.si_asmcodelen);
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/*
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* set map address (override target field of asmcode
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* "lui a0, 0x0; ori a0, 0x0;".
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*/
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*(unsigned short*)&mem[0] = (unsigned short)(((long)map) >> 16);
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*(unsigned short*)&mem[4] = (unsigned short)map;
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/*
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* construct start instruction
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*/
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if (!(phys_mem = (unsigned long)vtophysaddr(mem))) {
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msg_printf(MSG_ERROR, whoami, TEXT("Missing physical page.\n"));
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return -1;
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}
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jump_instruction = (0x08000000 | ((phys_mem >> 2) & 0x03ffffff));
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/*
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* map interrupt vector
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*/
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mem = (unsigned char*)VirtualAlloc(0, 0x400, MEM_RESERVE, PAGE_NOACCESS);
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if (!(VirtualCopy((LPVOID)mem, (LPVOID)(system_info.si_dramstart >> 8), 0x400,
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PAGE_READWRITE | PAGE_NOCACHE | PAGE_PHYSICAL))) {
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msg_printf(MSG_ERROR, whoami, TEXT("Mapping interrupt vector failed.\n"));
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return -1;
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}
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/*
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* Flush D-cache
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*/
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for (i = 0; i < DUMMYBUFSIZE; i++) {
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dummy_buf[i] = j;
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}
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for (i = 0; i < DUMMYBUFSIZE; i++) {
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j = dummy_buf[i];
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j++;
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}
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/*
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* Flush I-cache
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*/
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__asm(".space 32768;");
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/*
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* GO !
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*/
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*(unsigned long*)&mem[system_info.si_intrvec] = jump_instruction;
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return (0); /* not reachable */
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}
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