3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <asm/addrspace.h>
12 DECLARE_GLOBAL_DATA_PTR;
14 #define LINUX_MAX_ENVS 256
15 #define LINUX_MAX_ARGS 256
17 #if defined(CONFIG_MALTA)
18 #define mips_boot_malta 1
20 #define mips_boot_malta 0
23 #if defined(CONFIG_MIPS_BOOT_CMDLINE_LEGACY)
24 #define mips_boot_cmdline_legacy 1
26 #define mips_boot_cmdline_legacy 0
29 #if defined(CONFIG_MIPS_BOOT_ENV_LEGACY)
30 #define mips_boot_env_legacy 1
32 #define mips_boot_env_legacy 0
35 static int linux_argc;
36 static char **linux_argv;
37 static char *linux_argp;
39 static char **linux_env;
40 static char *linux_env_p;
41 static int linux_env_idx;
43 static ulong arch_get_sp(void)
47 __asm__ __volatile__("move %0, $sp" : "=r"(ret) : );
52 void arch_lmb_reserve(struct lmb *lmb)
57 debug("## Current stack ends at 0x%08lx\n", sp);
59 /* adjust sp by 4K to be safe */
61 lmb_reserve(lmb, sp, CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp);
64 static int boot_setup_linux(bootm_headers_t *images)
69 rd_len = images->rd_end - images->rd_start;
70 ret = boot_ramdisk_high(&images->lmb, images->rd_start,
71 rd_len, &images->initrd_start, &images->initrd_end);
78 static void linux_cmdline_init(void)
81 linux_argv = (char **)UNCACHED_SDRAM(gd->bd->bi_boot_params);
83 linux_argp = (char *)(linux_argv + LINUX_MAX_ARGS);
86 static void linux_cmdline_set(const char *value, size_t len)
88 linux_argv[linux_argc] = linux_argp;
89 memcpy(linux_argp, value, len);
92 linux_argp += len + 1;
96 static void linux_cmdline_dump(void)
100 debug("## cmdline argv at 0x%p, argp at 0x%p\n",
101 linux_argv, linux_argp);
103 for (i = 1; i < linux_argc; i++)
104 debug(" arg %03d: %s\n", i, linux_argv[i]);
107 static void linux_cmdline_legacy(bootm_headers_t *images)
109 const char *bootargs, *next, *quote;
111 linux_cmdline_init();
113 bootargs = getenv("bootargs");
119 while (bootargs && *bootargs && linux_argc < LINUX_MAX_ARGS) {
120 quote = strchr(bootargs, '"');
121 next = strchr(bootargs, ' ');
123 while (next && quote && quote < next) {
125 * we found a left quote before the next blank
126 * now we have to find the matching right quote
128 next = strchr(quote + 1, '"');
130 quote = strchr(next + 1, '"');
131 next = strchr(next + 1, ' ');
136 next = bootargs + strlen(bootargs);
138 linux_cmdline_set(bootargs, next - bootargs);
147 static void boot_cmdline_linux(bootm_headers_t *images)
149 if (mips_boot_cmdline_legacy) {
150 linux_cmdline_legacy(images);
151 linux_cmdline_dump();
155 static void linux_env_init(void)
157 linux_env = (char **)(((ulong) linux_argp + 15) & ~15);
159 linux_env_p = (char *)(linux_env + LINUX_MAX_ENVS);
163 static void linux_env_set(const char *env_name, const char *env_val)
165 if (linux_env_idx < LINUX_MAX_ENVS - 1) {
166 linux_env[linux_env_idx] = linux_env_p;
168 strcpy(linux_env_p, env_name);
169 linux_env_p += strlen(env_name);
171 if (mips_boot_malta) {
173 linux_env[++linux_env_idx] = linux_env_p;
175 *linux_env_p++ = '=';
178 strcpy(linux_env_p, env_val);
179 linux_env_p += strlen(env_val);
182 linux_env[++linux_env_idx] = 0;
186 static void linux_env_legacy(bootm_headers_t *images)
190 ulong rd_start, rd_size;
192 #ifdef CONFIG_MEMSIZE_IN_BYTES
193 sprintf(env_buf, "%lu", (ulong)gd->ram_size);
194 debug("## Giving linux memsize in bytes, %lu\n", (ulong)gd->ram_size);
196 sprintf(env_buf, "%lu", (ulong)(gd->ram_size >> 20));
197 debug("## Giving linux memsize in MB, %lu\n",
198 (ulong)(gd->ram_size >> 20));
199 #endif /* CONFIG_MEMSIZE_IN_BYTES */
201 rd_start = UNCACHED_SDRAM(images->initrd_start);
202 rd_size = images->initrd_end - images->initrd_start;
206 linux_env_set("memsize", env_buf);
208 sprintf(env_buf, "0x%08lX", rd_start);
209 linux_env_set("initrd_start", env_buf);
211 sprintf(env_buf, "0x%lX", rd_size);
212 linux_env_set("initrd_size", env_buf);
214 sprintf(env_buf, "0x%08X", (uint) (gd->bd->bi_flashstart));
215 linux_env_set("flash_start", env_buf);
217 sprintf(env_buf, "0x%X", (uint) (gd->bd->bi_flashsize));
218 linux_env_set("flash_size", env_buf);
220 cp = getenv("ethaddr");
222 linux_env_set("ethaddr", cp);
224 cp = getenv("eth1addr");
226 linux_env_set("eth1addr", cp);
228 if (mips_boot_malta) {
229 sprintf(env_buf, "%un8r", gd->baudrate);
230 linux_env_set("modetty0", env_buf);
234 static void boot_prep_linux(bootm_headers_t *images)
236 if (mips_boot_env_legacy)
237 linux_env_legacy(images);
240 static void boot_jump_linux(bootm_headers_t *images)
242 typedef void __noreturn (*kernel_entry_t)(int, ulong, ulong, ulong);
243 kernel_entry_t kernel = (kernel_entry_t) images->ep;
244 ulong linux_extra = 0;
246 debug("## Transferring control to Linux (at address %p) ...\n", kernel);
248 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
251 linux_extra = gd->ram_size;
253 /* we assume that the kernel is in place */
254 printf("\nStarting kernel ...\n\n");
256 kernel(linux_argc, (ulong)linux_argv, (ulong)linux_env, linux_extra);
259 int do_bootm_linux(int flag, int argc, char * const argv[],
260 bootm_headers_t *images)
264 /* No need for those on MIPS */
265 if (flag & BOOTM_STATE_OS_BD_T)
268 if (flag & BOOTM_STATE_OS_CMDLINE) {
269 boot_cmdline_linux(images);
273 if (flag & BOOTM_STATE_OS_PREP) {
274 boot_prep_linux(images);
278 if (flag & BOOTM_STATE_OS_GO) {
279 boot_jump_linux(images);
283 ret = boot_setup_linux(images);
287 boot_cmdline_linux(images);
288 boot_prep_linux(images);
289 boot_jump_linux(images);
291 /* does not return */