1 /* $NetBSD: mboot.c,v 1.12 2012/04/06 09:44:44 isaki Exp $ */
2
3 /*-
4 * Copyright (c) 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Minoura Makoto.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/types.h>
33 #include <machine/disklabel.h>
34
35 #include "iocs.h"
36
37 int bootmain(int);
38
39 #define PART_BOOTABLE 0
40 #define PART_UNUSED 1
41 #define PART_INUSE 2
42
43 int
bootmain(int scsiid)44 bootmain(int scsiid)
45 {
46 struct iocs_readcap cap;
47 int size;
48
49 if (IOCS_BITSNS(0) & 1) /* ESC key */
50 return 0;
51
52 if (IOCS_S_READCAP(scsiid, &cap) < 0) {
53 IOCS_B_PRINT(BOOT ": Error in reading.\r\n");
54 return 0;
55 }
56 size = cap.size >> 9;
57
58 {
59 long *label = (void*) 0x3000;
60 if (IOCS_S_READ(0, 1, scsiid, size, label) < 0) {
61 IOCS_B_PRINT(BOOT ": Error in reading.\r\n");
62 return 0;
63 }
64 if (label[0] != 0x58363853 ||
65 label[1] != 0x43534931) {
66 IOCS_B_PRINT(BOOT ": Invalid disk.\r\n");
67 return 0;
68 }
69 }
70
71 {
72 struct cpu_disklabel *label = (void*) 0x3000;
73 int i, firstinuse=-1;
74 unsigned char *t;
75
76 if (IOCS_S_READ(2<<(2-size), size?2:1, scsiid, size, label) < 0) {
77 IOCS_B_PRINT(BOOT ": Error in reading.\r\n");
78 return 0;
79 }
80 t = label->dosparts[0].dp_typname;
81 if (t[0] != 'X' || t[1] != '6' || t[2] != '8' || t[3] != 'K') {
82 IOCS_B_PRINT(BOOT ": Invalid disk.\r\n");
83 return 0;
84 }
85
86 for (i = 1; i < NDOSPART; i++) {
87 if (label->dosparts[i].dp_flag == PART_BOOTABLE)
88 break;
89 else if (label->dosparts[i].dp_flag == PART_INUSE)
90 firstinuse = i;
91 }
92 if (i >= NDOSPART && firstinuse >= 0)
93 i = firstinuse;
94 if (i < NDOSPART) {
95 unsigned int start = label->dosparts[i].dp_start;
96 unsigned int start1 = start << (2-size);
97 int r;
98 if ((start1 & 0x1fffff) == 0x1fffff)
99 r = IOCS_S_READ(start1,
100 8>>size,
101 scsiid,
102 size,
103 (void*) 0x2400);
104 else
105 r = IOCS_S_READEXT(start1,
106 8>>size,
107 scsiid,
108 size,
109 (void*) 0x2400);
110 if (r < 0) {
111 IOCS_B_PRINT(BOOT ": Error in reading.\r\n");
112 return 0;
113 }
114 if (*((char*) 0x2400) != 0x60) {
115 IOCS_B_PRINT(BOOT ": Invalid disk.\r\n");
116 return 0;
117 }
118 __asm volatile ("movl %0,%%d4\n\t"
119 "movl %1,%%d2\n\t"
120 "jsr 0x2400"
121 :
122 : "g" (scsiid), "g"(start)
123 : "d4");
124 return 0;
125 }
126 IOCS_B_PRINT(BOOT ": No bootable partition.\r\n");
127 return 0;
128 }
129
130 return 0;
131 }
132