3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <fdt_support.h>
11 #include <asm/addrspace.h>
14 DECLARE_GLOBAL_DATA_PTR;
16 #define LINUX_MAX_ENVS 256
17 #define LINUX_MAX_ARGS 256
19 static int linux_argc;
20 static char **linux_argv;
21 static char *linux_argp;
23 static char **linux_env;
24 static char *linux_env_p;
25 static int linux_env_idx;
27 static ulong arch_get_sp(void)
31 __asm__ __volatile__("move %0, $sp" : "=r"(ret) : );
36 void arch_lmb_reserve(struct lmb *lmb)
41 debug("## Current stack ends at 0x%08lx\n", sp);
43 /* adjust sp by 4K to be safe */
45 lmb_reserve(lmb, sp, CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp);
48 static void linux_cmdline_init(void)
51 linux_argv = (char **)UNCACHED_SDRAM(gd->bd->bi_boot_params);
53 linux_argp = (char *)(linux_argv + LINUX_MAX_ARGS);
56 static void linux_cmdline_set(const char *value, size_t len)
58 linux_argv[linux_argc] = linux_argp;
59 memcpy(linux_argp, value, len);
62 linux_argp += len + 1;
66 static void linux_cmdline_dump(void)
70 debug("## cmdline argv at 0x%p, argp at 0x%p\n",
71 linux_argv, linux_argp);
73 for (i = 1; i < linux_argc; i++)
74 debug(" arg %03d: %s\n", i, linux_argv[i]);
77 static void linux_cmdline_legacy(bootm_headers_t *images)
79 const char *bootargs, *next, *quote;
83 bootargs = getenv("bootargs");
89 while (bootargs && *bootargs && linux_argc < LINUX_MAX_ARGS) {
90 quote = strchr(bootargs, '"');
91 next = strchr(bootargs, ' ');
93 while (next && quote && quote < next) {
95 * we found a left quote before the next blank
96 * now we have to find the matching right quote
98 next = strchr(quote + 1, '"');
100 quote = strchr(next + 1, '"');
101 next = strchr(next + 1, ' ');
106 next = bootargs + strlen(bootargs);
108 linux_cmdline_set(bootargs, next - bootargs);
117 static void linux_cmdline_append(bootm_headers_t *images)
120 ulong mem, rd_start, rd_size;
123 mem = gd->ram_size >> 20;
124 sprintf(buf, "mem=%luM", mem);
125 linux_cmdline_set(buf, strlen(buf));
127 /* append rd_start and rd_size */
128 rd_start = images->initrd_start;
129 rd_size = images->initrd_end - images->initrd_start;
132 sprintf(buf, "rd_start=0x%08lX", rd_start);
133 linux_cmdline_set(buf, strlen(buf));
134 sprintf(buf, "rd_size=0x%lX", rd_size);
135 linux_cmdline_set(buf, strlen(buf));
139 static void linux_env_init(void)
141 linux_env = (char **)(((ulong) linux_argp + 15) & ~15);
143 linux_env_p = (char *)(linux_env + LINUX_MAX_ENVS);
147 static void linux_env_set(const char *env_name, const char *env_val)
149 if (linux_env_idx < LINUX_MAX_ENVS - 1) {
150 linux_env[linux_env_idx] = linux_env_p;
152 strcpy(linux_env_p, env_name);
153 linux_env_p += strlen(env_name);
155 if (CONFIG_IS_ENABLED(MALTA)) {
157 linux_env[++linux_env_idx] = linux_env_p;
159 *linux_env_p++ = '=';
162 strcpy(linux_env_p, env_val);
163 linux_env_p += strlen(env_val);
166 linux_env[++linux_env_idx] = 0;
170 static void linux_env_legacy(bootm_headers_t *images)
174 ulong rd_start, rd_size;
176 if (CONFIG_IS_ENABLED(MEMSIZE_IN_BYTES)) {
177 sprintf(env_buf, "%lu", (ulong)gd->ram_size);
178 debug("## Giving linux memsize in bytes, %lu\n",
179 (ulong)gd->ram_size);
181 sprintf(env_buf, "%lu", (ulong)(gd->ram_size >> 20));
182 debug("## Giving linux memsize in MB, %lu\n",
183 (ulong)(gd->ram_size >> 20));
186 rd_start = UNCACHED_SDRAM(images->initrd_start);
187 rd_size = images->initrd_end - images->initrd_start;
191 linux_env_set("memsize", env_buf);
193 sprintf(env_buf, "0x%08lX", rd_start);
194 linux_env_set("initrd_start", env_buf);
196 sprintf(env_buf, "0x%lX", rd_size);
197 linux_env_set("initrd_size", env_buf);
199 sprintf(env_buf, "0x%08X", (uint) (gd->bd->bi_flashstart));
200 linux_env_set("flash_start", env_buf);
202 sprintf(env_buf, "0x%X", (uint) (gd->bd->bi_flashsize));
203 linux_env_set("flash_size", env_buf);
205 cp = getenv("ethaddr");
207 linux_env_set("ethaddr", cp);
209 cp = getenv("eth1addr");
211 linux_env_set("eth1addr", cp);
213 if (CONFIG_IS_ENABLED(MALTA)) {
214 sprintf(env_buf, "%un8r", gd->baudrate);
215 linux_env_set("modetty0", env_buf);
219 static int boot_reloc_ramdisk(bootm_headers_t *images)
221 ulong rd_len = images->rd_end - images->rd_start;
224 * In case of legacy uImage's, relocation of ramdisk is already done
225 * by do_bootm_states() and should not repeated in 'bootm prep'.
227 if (images->state & BOOTM_STATE_RAMDISK) {
228 debug("## Ramdisk already relocated\n");
232 return boot_ramdisk_high(&images->lmb, images->rd_start,
233 rd_len, &images->initrd_start, &images->initrd_end);
236 static int boot_reloc_fdt(bootm_headers_t *images)
239 * In case of legacy uImage's, relocation of FDT is already done
240 * by do_bootm_states() and should not repeated in 'bootm prep'.
242 if (images->state & BOOTM_STATE_FDT) {
243 debug("## FDT already relocated\n");
247 #if CONFIG_IS_ENABLED(MIPS_BOOT_FDT) && CONFIG_IS_ENABLED(OF_LIBFDT)
248 boot_fdt_add_mem_rsv_regions(&images->lmb, images->ft_addr);
249 return boot_relocate_fdt(&images->lmb, &images->ft_addr,
256 #ifdef CONFIG_ARCH_FIXUP_FDT
257 int arch_fixup_fdt(void *blob)
259 #if CONFIG_IS_ENABLED(MIPS_BOOT_FDT) && CONFIG_IS_ENABLED(OF_LIBFDT)
260 u64 mem_start = virt_to_phys((void *)gd->bd->bi_memstart);
261 u64 mem_size = gd->ram_size;
263 return fdt_fixup_memory_banks(blob, &mem_start, &mem_size, 1);
270 static int boot_setup_fdt(bootm_headers_t *images)
272 return image_setup_libfdt(images, images->ft_addr, images->ft_len,
276 static void boot_prep_linux(bootm_headers_t *images)
278 boot_reloc_ramdisk(images);
280 if (CONFIG_IS_ENABLED(MIPS_BOOT_FDT) && images->ft_len) {
281 boot_reloc_fdt(images);
282 boot_setup_fdt(images);
284 if (CONFIG_IS_ENABLED(CONFIG_MIPS_BOOT_ENV_LEGACY))
285 linux_env_legacy(images);
287 if (CONFIG_IS_ENABLED(MIPS_BOOT_CMDLINE_LEGACY)) {
288 linux_cmdline_legacy(images);
290 if (!CONFIG_IS_ENABLED(CONFIG_MIPS_BOOT_ENV_LEGACY))
291 linux_cmdline_append(images);
293 linux_cmdline_dump();
298 static void boot_jump_linux(bootm_headers_t *images)
300 typedef void __noreturn (*kernel_entry_t)(int, ulong, ulong, ulong);
301 kernel_entry_t kernel = (kernel_entry_t) images->ep;
302 ulong linux_extra = 0;
304 debug("## Transferring control to Linux (at address %p) ...\n", kernel);
306 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
308 if (CONFIG_IS_ENABLED(MALTA))
309 linux_extra = gd->ram_size;
311 #if CONFIG_IS_ENABLED(BOOTSTAGE_FDT)
312 bootstage_fdt_add_report();
314 #if CONFIG_IS_ENABLED(BOOTSTAGE_REPORT)
319 kernel(-2, (ulong)images->ft_addr, 0, 0);
321 kernel(linux_argc, (ulong)linux_argv, (ulong)linux_env,
325 int do_bootm_linux(int flag, int argc, char * const argv[],
326 bootm_headers_t *images)
328 /* No need for those on MIPS */
329 if (flag & BOOTM_STATE_OS_BD_T)
333 * Cmdline init has been moved to 'bootm prep' because it has to be
334 * done after relocation of ramdisk to always pass correct values
335 * for rd_start and rd_size to Linux kernel.
337 if (flag & BOOTM_STATE_OS_CMDLINE)
340 if (flag & BOOTM_STATE_OS_PREP) {
341 boot_prep_linux(images);
345 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
346 boot_jump_linux(images);
350 /* does not return */