1 /* $NetBSD: mips.c,v 1.4 2007/03/04 05:59:53 christos 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
mips_boot(void * map)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 }
111