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

111 lines
3.4 KiB
C

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