summaryrefslogtreecommitdiffstats
path: root/lib_i386/i386_linux.c
blob: b4a6f5a3cdd3bed82bcf43042e6decc181a591f6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
/*
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * Copyright (C) 2001  Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <common.h>
#include <command.h>
#include <image.h>
#include <zlib.h>
#include <asm/byteorder.h>
#include <asm/zimage.h>

/*cmd_boot.c*/
extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);

extern image_header_t header;           /* from cmd_bootm.c */


image_header_t *fake_header(image_header_t *hdr, void *ptr, int size)
{
	/* try each supported image type in order */
	if (NULL != fake_zimage_header(hdr, ptr, size)) {
		return hdr;
	}

	return NULL;
}


void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
		ulong addr, ulong *len_ptr, int   verify)
{
	void *base_ptr;

	ulong len = 0, checksum;
	ulong initrd_start, initrd_end;
	ulong data;
	image_header_t *hdr = &header;

	/*
	 * Check if there is an initrd image
	 */
	if (argc >= 3) {
		addr = simple_strtoul(argv[2], NULL, 16);

		printf ("## Loading Ramdisk Image at %08lx ...\n", addr);

		/* Copy header so we can blank CRC field for re-calculation */
		memcpy (&header, (char *)addr, sizeof(image_header_t));

		if (ntohl(hdr->ih_magic) != IH_MAGIC) {
			printf ("Bad Magic Number\n");
			do_reset (cmdtp, flag, argc, argv);
		}

		data = (ulong)&header;
		len  = sizeof(image_header_t);

		checksum = ntohl(hdr->ih_hcrc);
		hdr->ih_hcrc = 0;

		if (crc32 (0, (char *)data, len) != checksum) {
			printf ("Bad Header Checksum\n");
			do_reset (cmdtp, flag, argc, argv);
		}

		print_image_hdr (hdr);

		data = addr + sizeof(image_header_t);
		len  = ntohl(hdr->ih_size);

		if (verify) {
			ulong csum = 0;

			printf ("   Verifying Checksum ... ");
			csum = crc32 (0, (char *)data, len);
			if (csum != ntohl(hdr->ih_dcrc)) {
				printf ("Bad Data CRC\n");
				do_reset (cmdtp, flag, argc, argv);
			}
			printf ("OK\n");
		}

		if ((hdr->ih_os   != IH_OS_LINUX)	||
		    (hdr->ih_arch != IH_CPU_I386)	||
		    (hdr->ih_type != IH_TYPE_RAMDISK)	) {
			printf ("No Linux i386 Ramdisk Image\n");
			do_reset (cmdtp, flag, argc, argv);
		}

		/*
		 * Now check if we have a multifile image
		 */
	} else if ((hdr->ih_type==IH_TYPE_MULTI) && (len_ptr[1])) {
		ulong tail    = ntohl(len_ptr[0]) % 4;
		int i;

		/* skip kernel length and terminator */
		data = (ulong)(&len_ptr[2]);
		/* skip any additional image length fields */
		for (i=1; len_ptr[i]; ++i)
			data += 4;
		/* add kernel length, and align */
		data += ntohl(len_ptr[0]);
		if (tail) {
			data += 4 - tail;
		}

		len   = ntohl(len_ptr[1]);

	} else {
		/*
		 * no initrd image
		 */
		data = 0;
	}

#ifdef	DEBUG
	if (!data) {
		printf ("No initrd\n");
	}
#endif

	if (data) {
		initrd_start = data;
		initrd_end   = initrd_start + len;
		printf ("   Loading Ramdisk to %08lx, end %08lx ... ",
			initrd_start, initrd_end);
		memmove ((void *)initrd_start, (void *)data, len);
		printf ("OK\n");
	} else {
		initrd_start = 0;
		initrd_end = 0;
	}

	/* if multi-part image, we need to advance base ptr */
	if ((hdr->ih_type==IH_TYPE_MULTI) && (len_ptr[1])) {
		int i;
		for (i=0, addr+=sizeof(int); len_ptr[i++]; addr+=sizeof(int));
	}

	base_ptr = load_zimage((void*)addr + sizeof(image_header_t), ntohl(hdr->ih_size),
			       initrd_start, initrd_end-initrd_start, 0);

	if (NULL == base_ptr) {
		printf ("## Kernel loading failed ...\n");
		do_reset(cmdtp, flag, argc, argv);

	}

#ifdef DEBUG
	printf ("## Transferring control to Linux (at address %08x) ...\n",
		(u32)base_ptr);
#endif

	/* we assume that the kernel is in place */
	printf("\nStarting kernel ...\n\n");

	boot_zimage(base_ptr);

}
OpenPOWER on IntegriCloud