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