1/*	$NetBSD: mboot.c,v 1.9.8.1 2012/04/09 18:08:31 riz 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
37int bootmain(int);
38
39#define PART_BOOTABLE	0
40#define PART_UNUSED	1
41#define PART_INUSE	2
42
43int
44bootmain(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