summaryrefslogtreecommitdiff
path: root/arch/mips/lib/bootm.c
blob: 692f7dc6ca2dce8e0c4637ae2c11277765e08dbe (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
/*
 * (C) Copyright 2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <command.h>
#include <image.h>
#include <u-boot/zlib.h>
#include <asm/byteorder.h>
#include <asm/addrspace.h>

DECLARE_GLOBAL_DATA_PTR;

#define	LINUX_MAX_ENVS		256
#define	LINUX_MAX_ARGS		256

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);

static void boot_prep_linux(bootm_headers_t *images)
{
	char *commandline = getenv("bootargs");
	char env_buf[12];
	char *cp;

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

#ifdef CONFIG_MEMSIZE_IN_BYTES
	sprintf(env_buf, "%lu", (ulong)gd->ram_size);
	debug("## Giving linux memsize in bytes, %lu\n", (ulong)gd->ram_size);
#else
	sprintf(env_buf, "%lu", (ulong)(gd->ram_size >> 20));
	debug("## Giving linux memsize in MB, %lu\n",
	      (ulong)(gd->ram_size >> 20));
#endif /* CONFIG_MEMSIZE_IN_BYTES */

	linux_env_set("memsize", env_buf);

	sprintf(env_buf, "0x%08X", (uint) UNCACHED_SDRAM(images->rd_start));
	linux_env_set("initrd_start", env_buf);

	sprintf(env_buf, "0x%X", (uint) (images->rd_end - images->rd_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);

	cp = getenv("ethaddr");
	if (cp)
		linux_env_set("ethaddr", cp);

	cp = getenv("eth1addr");
	if (cp)
		linux_env_set("eth1addr", cp);
}

static void boot_jump_linux(bootm_headers_t *images)
{
	typedef void __noreturn (*kernel_entry_t)(int, ulong, ulong, ulong);
	kernel_entry_t kernel = (kernel_entry_t) images->ep;

	debug("## Transferring control to Linux (at address %p) ...\n", kernel);

	bootstage_mark(BOOTSTAGE_ID_RUN_OS);

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

	kernel(linux_argc, (ulong)linux_argv, (ulong)linux_env, 0);
}

int do_bootm_linux(int flag, int argc, char * const argv[],
			bootm_headers_t *images)
{
	/* No need for those on MIPS */
	if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
		return -1;

	if (flag & BOOTM_STATE_OS_PREP) {
		boot_prep_linux(images);
		return 0;
	}

	if (flag & BOOTM_STATE_OS_GO) {
		boot_jump_linux(images);
		return 0;
	}

	boot_prep_linux(images);
	boot_jump_linux(images);

	/* does not return */
	return 1;
}

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 && quote && 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) {
				quote = strchr(next + 1, '"');
				next = strchr(next + 1, ' ');
			}
		}

		if (!next)
			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;
	}
}