summaryrefslogtreecommitdiff
path: root/lib_mips/mips_linux.c
blob: e73d4d8527539a38e211cf3c6f45def0bc99b37e (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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
/*
 * (C) Copyright 2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 <cmd_boot.h>
#include <image.h>
#include <zlib.h>
#include <asm/byteorder.h>
#include <asm/addrspace.h>

#define	LINUX_MAX_ENVS		256
#define	LINUX_MAX_ARGS		256

#ifdef CONFIG_SHOW_BOOT_PROGRESS
# include <status_led.h>
# define SHOW_BOOT_PROGRESS(arg)	show_boot_progress(arg)
#else
# define SHOW_BOOT_PROGRESS(arg)
#endif

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

static int	linux_argc;
static char **	linux_argv;

static char **	linux_env;
static char *	linux_env_p;
static int	linux_env_idx;

static void linux_params_init (ulong start, char * commandline);
static void linux_env_set (char * env_name, char * env_val);


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

    ulong len = 0, checksum;
    ulong initrd_start, initrd_end;
    ulong data;
    void (*theKernel)(int, char **, char **, int *);
    image_header_t *hdr = &header;
    char *commandline = getenv("bootargs");
    char env_buf[12];

    theKernel = (void (*)(int, char **, char **, int *))ntohl(hdr->ih_ep);

    /*
     * Check if there is an initrd image
     */
    if (argc >= 3) {
	SHOW_BOOT_PROGRESS (9);

	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");
	    SHOW_BOOT_PROGRESS (-10);
	    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");
	    SHOW_BOOT_PROGRESS (-11);
	    do_reset (cmdtp, flag, argc, argv);
	}

	SHOW_BOOT_PROGRESS (10);

	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");
	        SHOW_BOOT_PROGRESS (-12);
		do_reset (cmdtp, flag, argc, argv);
	    }
	    printf ("OK\n");
	}

	SHOW_BOOT_PROGRESS (11);

	if ((hdr->ih_os   != IH_OS_LINUX)	||
	    (hdr->ih_arch != IH_CPU_MIPS)	||
	    (hdr->ih_type != IH_TYPE_RAMDISK)	) {
	    printf ("No Linux MIPS Ramdisk Image\n");
	    SHOW_BOOT_PROGRESS (-13);
	    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;

	SHOW_BOOT_PROGRESS (13);

	/* 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
	 */
        SHOW_BOOT_PROGRESS (14);

	data = 0;
    }

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

    if (data) {
	initrd_start = data;
	initrd_end   = initrd_start + len;
    } else {
	initrd_start = 0;
	initrd_end = 0;
    }

    SHOW_BOOT_PROGRESS (15);

#ifdef DEBUG
    printf ("## Transferring control to Linux (at address %08lx) ...\n",
	    (ulong)theKernel);
#endif

    linux_params_init (PHYSADDR(gd->bd->bi_boot_params), commandline);

    sprintf (env_buf, "%lu", gd->ram_size >> 20);
    linux_env_set ("memsize", env_buf);

    sprintf (env_buf, "0x%08X", (uint)PHYSADDR(initrd_start));
    linux_env_set ("initrd_start", env_buf);

    sprintf (env_buf, "0x%X", (uint)(initrd_end - initrd_start));
    linux_env_set ("initrd_size", env_buf);

    sprintf (env_buf, "0x%08X", (uint)(gd->bd->bi_flashstart));
    linux_env_set ("flash_start", env_buf);

    sprintf (env_buf, "0x%X", (uint)(gd->bd->bi_flashsize));
    linux_env_set ("flash_size", env_buf);

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

    theKernel(linux_argc, linux_argv, linux_env, 0);
}

static void linux_params_init (ulong start, char * line)
{
    char * next, * quote, * argp;

    linux_argc = 1;
    linux_argv = (char **) start;
    linux_argv[0] = 0;
    argp = (char *)(linux_argv + LINUX_MAX_ARGS);

    next = line;

    while (line && *line && linux_argc < LINUX_MAX_ARGS)
    {
	quote = strchr (line, '"');
	next = strchr (line, ' ');

        while (next != NULL && quote != NULL && quote < next)
	{
	    /* we found a left quote before the next blank
             * now we have to find the matching right quote
             */
            next = strchr (quote + 1, '"');
            if (next != NULL)
	    {
                quote = strchr (next + 1, '"');
                next = strchr (next + 1, ' ');
            }
        }
	
	if (next == NULL)
	{
	    next = line + strlen (line);
	}

	linux_argv [linux_argc] = argp;
	memcpy (argp, line, next - line);
	argp [next - line] = 0;

	argp += next - line + 1;
	linux_argc ++;
        
	if (*next) next ++;
	
	line = next;
    }

    linux_env = (char **)(((ulong)argp + 15) & ~15);
    linux_env [0] = 0;
    linux_env_p = (char *)(linux_env + LINUX_MAX_ENVS);
    linux_env_idx = 0;
}

static void linux_env_set (char * env_name, char * env_val)
{
    if (linux_env_idx < LINUX_MAX_ENVS - 1)
    {
	linux_env [linux_env_idx] = linux_env_p;

	strcpy (linux_env_p, env_name);
	linux_env_p += strlen (env_name);

	strcpy (linux_env_p, "=");
	linux_env_p += 1;

	strcpy (linux_env_p, env_val);
	linux_env_p += strlen (env_val);
	
	linux_env_p ++;
	linux_env [++ linux_env_idx] = 0;
    }
}