summaryrefslogtreecommitdiff
path: root/arch/mips/lib/bootm.c
blob: 9fec4ad43860717263ea04d1981d0711d3c44502 (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
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
/*
 * (C) Copyright 2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <image.h>
#include <fdt_support.h>
#include <asm/addrspace.h>
#include <asm/io.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_argp;

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

static ulong arch_get_sp(void)
{
	ulong ret;

	__asm__ __volatile__("move %0, $sp" : "=r"(ret) : );

	return ret;
}

void arch_lmb_reserve(struct lmb *lmb)
{
	ulong sp;

	sp = arch_get_sp();
	debug("## Current stack ends at 0x%08lx\n", sp);

	/* adjust sp by 4K to be safe */
	sp -= 4096;
	lmb_reserve(lmb, sp, gd->ram_top - sp);
}

static void linux_cmdline_init(void)
{
	linux_argc = 1;
	linux_argv = (char **)UNCACHED_SDRAM(gd->bd->bi_boot_params);
	linux_argv[0] = 0;
	linux_argp = (char *)(linux_argv + LINUX_MAX_ARGS);
}

static void linux_cmdline_set(const char *value, size_t len)
{
	linux_argv[linux_argc] = linux_argp;
	memcpy(linux_argp, value, len);
	linux_argp[len] = 0;

	linux_argp += len + 1;
	linux_argc++;
}

static void linux_cmdline_dump(void)
{
	int i;

	debug("## cmdline argv at 0x%p, argp at 0x%p\n",
	      linux_argv, linux_argp);

	for (i = 1; i < linux_argc; i++)
		debug("   arg %03d: %s\n", i, linux_argv[i]);
}

static void linux_cmdline_legacy(bootm_headers_t *images)
{
	const char *bootargs, *next, *quote;

	linux_cmdline_init();

	bootargs = getenv("bootargs");
	if (!bootargs)
		return;

	next = bootargs;

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

		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 = bootargs + strlen(bootargs);

		linux_cmdline_set(bootargs, next - bootargs);

		if (*next)
			next++;

		bootargs = next;
	}
}

static void linux_cmdline_append(bootm_headers_t *images)
{
	char buf[24];
	ulong mem, rd_start, rd_size;

	/* append mem */
	mem = gd->ram_size >> 20;
	sprintf(buf, "mem=%luM", mem);
	linux_cmdline_set(buf, strlen(buf));

	/* append rd_start and rd_size */
	rd_start = images->initrd_start;
	rd_size = images->initrd_end - images->initrd_start;

	if (rd_size) {
		sprintf(buf, "rd_start=0x%08lX", rd_start);
		linux_cmdline_set(buf, strlen(buf));
		sprintf(buf, "rd_size=0x%lX", rd_size);
		linux_cmdline_set(buf, strlen(buf));
	}
}

static void linux_env_init(void)
{
	linux_env = (char **)(((ulong) linux_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(const char *env_name, const 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);

		if (CONFIG_IS_ENABLED(MALTA)) {
			linux_env_p++;
			linux_env[++linux_env_idx] = linux_env_p;
		} else {
			*linux_env_p++ = '=';
		}

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

		linux_env_p++;
		linux_env[++linux_env_idx] = 0;
	}
}

static void linux_env_legacy(bootm_headers_t *images)
{
	char env_buf[12];
	const char *cp;
	ulong rd_start, rd_size;

	if (CONFIG_IS_ENABLED(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));
	}

	rd_start = UNCACHED_SDRAM(images->initrd_start);
	rd_size = images->initrd_end - images->initrd_start;

	linux_env_init();

	linux_env_set("memsize", env_buf);

	sprintf(env_buf, "0x%08lX", rd_start);
	linux_env_set("initrd_start", env_buf);

	sprintf(env_buf, "0x%lX", rd_size);
	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);

	if (CONFIG_IS_ENABLED(MALTA)) {
		sprintf(env_buf, "%un8r", gd->baudrate);
		linux_env_set("modetty0", env_buf);
	}
}

static int boot_reloc_ramdisk(bootm_headers_t *images)
{
	ulong rd_len = images->rd_end - images->rd_start;

	/*
	 * In case of legacy uImage's, relocation of ramdisk is already done
	 * by do_bootm_states() and should not repeated in 'bootm prep'.
	 */
	if (images->state & BOOTM_STATE_RAMDISK) {
		debug("## Ramdisk already relocated\n");
		return 0;
	}

	return boot_ramdisk_high(&images->lmb, images->rd_start,
		rd_len, &images->initrd_start, &images->initrd_end);
}

static int boot_reloc_fdt(bootm_headers_t *images)
{
	/*
	 * In case of legacy uImage's, relocation of FDT is already done
	 * by do_bootm_states() and should not repeated in 'bootm prep'.
	 */
	if (images->state & BOOTM_STATE_FDT) {
		debug("## FDT already relocated\n");
		return 0;
	}

#if CONFIG_IS_ENABLED(MIPS_BOOT_FDT) && CONFIG_IS_ENABLED(OF_LIBFDT)
	boot_fdt_add_mem_rsv_regions(&images->lmb, images->ft_addr);
	return boot_relocate_fdt(&images->lmb, &images->ft_addr,
		&images->ft_len);
#else
	return 0;
#endif
}

#ifdef CONFIG_ARCH_FIXUP_FDT
int arch_fixup_fdt(void *blob)
{
#if CONFIG_IS_ENABLED(MIPS_BOOT_FDT) && CONFIG_IS_ENABLED(OF_LIBFDT)
	u64 mem_start = virt_to_phys((void *)gd->bd->bi_memstart);
	u64 mem_size = gd->ram_size;

	return fdt_fixup_memory_banks(blob, &mem_start, &mem_size, 1);
#else
	return 0;
#endif
}
#endif

static int boot_setup_fdt(bootm_headers_t *images)
{
	return image_setup_libfdt(images, images->ft_addr, images->ft_len,
		&images->lmb);
}

static void boot_prep_linux(bootm_headers_t *images)
{
	boot_reloc_ramdisk(images);

	if (CONFIG_IS_ENABLED(MIPS_BOOT_FDT) && images->ft_len) {
		boot_reloc_fdt(images);
		boot_setup_fdt(images);
	} else {
		if (CONFIG_IS_ENABLED(CONFIG_MIPS_BOOT_ENV_LEGACY))
			linux_env_legacy(images);

		if (CONFIG_IS_ENABLED(MIPS_BOOT_CMDLINE_LEGACY)) {
			linux_cmdline_legacy(images);

			if (!CONFIG_IS_ENABLED(CONFIG_MIPS_BOOT_ENV_LEGACY))
				linux_cmdline_append(images);

			linux_cmdline_dump();
		}
	}
}

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;
	ulong linux_extra = 0;

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

	bootstage_mark(BOOTSTAGE_ID_RUN_OS);

	if (CONFIG_IS_ENABLED(MALTA))
		linux_extra = gd->ram_size;

#if CONFIG_IS_ENABLED(BOOTSTAGE_FDT)
	bootstage_fdt_add_report();
#endif
#if CONFIG_IS_ENABLED(BOOTSTAGE_REPORT)
	bootstage_report();
#endif

	if (images->ft_len)
		kernel(-2, (ulong)images->ft_addr, 0, 0);
	else
		kernel(linux_argc, (ulong)linux_argv, (ulong)linux_env,
			linux_extra);
}

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)
		return -1;

	/*
	 * Cmdline init has been moved to 'bootm prep' because it has to be
	 * done after relocation of ramdisk to always pass correct values
	 * for rd_start and rd_size to Linux kernel.
	 */
	if (flag & BOOTM_STATE_OS_CMDLINE)
		return 0;

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

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

	/* does not return */
	return 1;
}