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
|
/*
* (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 <image.h>
#include <zlib.h>
#include <bzlib.h>
#include <watchdog.h>
#include <environment.h>
#include <asm/byteorder.h>
DECLARE_GLOBAL_DATA_PTR;
#define PHYSADDR(x) x
#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
void do_bootm_linux(cmd_tbl_t * cmdtp, int flag,
int argc, char *argv[],
image_header_t *hdr, int verify)
{
ulong sp;
ulong rd_data_start, rd_data_end, rd_len;
ulong initrd_high;
ulong initrd_start, initrd_end;
int initrd_copy_to_ram = 1;
ulong cmd_start, cmd_end;
char *cmdline;
char *s;
bd_t *kbd;
void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
if ((s = getenv("initrd_high")) != NULL) {
/* a value of "no" or a similar string will act like 0,
* turning the "load high" feature off. This is intentional.
*/
initrd_high = simple_strtoul(s, NULL, 16);
if (initrd_high == ~0)
initrd_copy_to_ram = 0;
} else { /* not set, no restrictions to load high */
initrd_high = ~0;
}
#ifdef CONFIG_LOGBUFFER
kbd = gd->bd;
/* Prevent initrd from overwriting logbuffer */
if (initrd_high < (kbd->bi_memsize - LOGBUFF_LEN - LOGBUFF_OVERHEAD))
initrd_high = kbd->bi_memsize - LOGBUFF_LEN - LOGBUFF_OVERHEAD;
debug("## Logbuffer at 0x%08lX ", kbd->bi_memsize - LOGBUFF_LEN);
#endif
/*
* Booting a (Linux) kernel image
*
* Allocate space for command line and board info - the
* address should be as high as possible within the reach of
* the kernel (see CFG_BOOTMAPSZ settings), but in unused
* memory, which means far enough below the current stack
* pointer.
*/
asm("movel %%a7, %%d0\n"
"movel %%d0, %0\n": "=d"(sp): :"%d0");
debug("## Current stack ends at 0x%08lX ", sp);
sp -= 2048; /* just to be sure */
if (sp > CFG_BOOTMAPSZ)
sp = CFG_BOOTMAPSZ;
sp &= ~0xF;
debug("=> set upper limit to 0x%08lX\n", sp);
cmdline = (char *)((sp - CFG_BARGSIZE) & ~0xF);
kbd = (bd_t *) (((ulong) cmdline - sizeof(bd_t)) & ~0xF);
if ((s = getenv("bootargs")) == NULL)
s = "";
strcpy(cmdline, s);
cmd_start = (ulong) & cmdline[0];
cmd_end = cmd_start + strlen(cmdline);
*kbd = *(gd->bd);
#ifdef DEBUG
printf("## cmdline at 0x%08lX ... 0x%08lX\n", cmd_start, cmd_end);
do_bdinfo(NULL, 0, 0, NULL);
#endif
if ((s = getenv("clocks_in_mhz")) != NULL) {
/* convert all clock information to MHz */
kbd->bi_intfreq /= 1000000L;
kbd->bi_busfreq /= 1000000L;
}
kernel =
(void (*)(bd_t *, ulong, ulong, ulong, ulong))image_get_ep (hdr);
get_ramdisk (cmdtp, flag, argc, argv, hdr, verify,
IH_ARCH_M68K, &rd_data_start, &rd_data_end);
rd_len = rd_data_end - rd_data_start;
if (rd_data_start) {
if (!initrd_copy_to_ram) { /* zero-copy ramdisk support */
initrd_start = rd_data_start;
initrd_end = rd_data_end;
} else {
initrd_start = (ulong) kbd - rd_len;
initrd_start &= ~(4096 - 1); /* align on page */
if (initrd_high) {
ulong nsp;
/*
* the inital ramdisk does not need to be within
* CFG_BOOTMAPSZ as it is not accessed until after
* the mm system is initialised.
*
* do the stack bottom calculation again and see if
* the initrd will fit just below the monitor stack
* bottom without overwriting the area allocated
* above for command line args and board info.
*/
asm("movel %%a7, %%d0\n"
"movel %%d0, %0\n": "=d"(nsp): :"%d0");
nsp -= 2048; /* just to be sure */
nsp &= ~0xF;
if (nsp > initrd_high) /* limit as specified */
nsp = initrd_high;
nsp -= rd_len;
nsp &= ~(4096 - 1); /* align on page */
if (nsp >= sp)
initrd_start = nsp;
}
SHOW_BOOT_PROGRESS(12);
debug
("## initrd at 0x%08lX ... 0x%08lX (len=%ld=0x%lX)\n",
rd_data_start, rd_data_end - 1, rd_len, rd_len);
initrd_end = initrd_start + rd_len;
printf(" Loading Ramdisk to %08lx, end %08lx ... ",
initrd_start, initrd_end);
memmove_wd((void *)initrd_start,
(void *)rd_data_start, rd_len, CHUNKSZ);
puts("OK\n");
}
} else {
initrd_start = 0;
initrd_end = 0;
}
debug("## Transferring control to Linux (at address %08lx) ...\n",
(ulong) kernel);
SHOW_BOOT_PROGRESS(15);
/*
* Linux Kernel Parameters (passing board info data):
* r3: ptr to board info data
* r4: initrd_start or 0 if no initrd
* r5: initrd_end - unused if r4 is 0
* r6: Start of command line string
* r7: End of command line string
*/
(*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
/* does not return */
}
|
