1 /* 2 * (C) Copyright 2003 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <image.h> 10 #include <asm/addrspace.h> 11 12 DECLARE_GLOBAL_DATA_PTR; 13 14 #define LINUX_MAX_ENVS 256 15 #define LINUX_MAX_ARGS 256 16 17 #if defined(CONFIG_MALTA) 18 #define mips_boot_malta 1 19 #else 20 #define mips_boot_malta 0 21 #endif 22 23 #if defined(CONFIG_MIPS_BOOT_CMDLINE_LEGACY) 24 #define mips_boot_cmdline_legacy 1 25 #else 26 #define mips_boot_cmdline_legacy 0 27 #endif 28 29 static int linux_argc; 30 static char **linux_argv; 31 static char *linux_argp; 32 33 static char **linux_env; 34 static char *linux_env_p; 35 static int linux_env_idx; 36 37 static ulong arch_get_sp(void) 38 { 39 ulong ret; 40 41 __asm__ __volatile__("move %0, $sp" : "=r"(ret) : ); 42 43 return ret; 44 } 45 46 void arch_lmb_reserve(struct lmb *lmb) 47 { 48 ulong sp; 49 50 sp = arch_get_sp(); 51 debug("## Current stack ends at 0x%08lx\n", sp); 52 53 /* adjust sp by 4K to be safe */ 54 sp -= 4096; 55 lmb_reserve(lmb, sp, CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp); 56 } 57 58 static int boot_setup_linux(bootm_headers_t *images) 59 { 60 int ret; 61 ulong rd_len; 62 63 rd_len = images->rd_end - images->rd_start; 64 ret = boot_ramdisk_high(&images->lmb, images->rd_start, 65 rd_len, &images->initrd_start, &images->initrd_end); 66 if (ret) 67 return ret; 68 69 return 0; 70 } 71 72 static void linux_cmdline_init(void) 73 { 74 linux_argc = 1; 75 linux_argv = (char **)UNCACHED_SDRAM(gd->bd->bi_boot_params); 76 linux_argv[0] = 0; 77 linux_argp = (char *)(linux_argv + LINUX_MAX_ARGS); 78 } 79 80 static void linux_cmdline_set(const char *value, size_t len) 81 { 82 linux_argv[linux_argc] = linux_argp; 83 memcpy(linux_argp, value, len); 84 linux_argp[len] = 0; 85 86 linux_argp += len + 1; 87 linux_argc++; 88 } 89 90 static void linux_cmdline_dump(void) 91 { 92 int i; 93 94 debug("## cmdline argv at 0x%p, argp at 0x%p\n", 95 linux_argv, linux_argp); 96 97 for (i = 1; i < linux_argc; i++) 98 debug(" arg %03d: %s\n", i, linux_argv[i]); 99 } 100 101 static void linux_cmdline_legacy(bootm_headers_t *images) 102 { 103 const char *bootargs, *next, *quote; 104 105 linux_cmdline_init(); 106 107 bootargs = getenv("bootargs"); 108 if (!bootargs) 109 return; 110 111 next = bootargs; 112 113 while (bootargs && *bootargs && linux_argc < LINUX_MAX_ARGS) { 114 quote = strchr(bootargs, '"'); 115 next = strchr(bootargs, ' '); 116 117 while (next && quote && quote < next) { 118 /* 119 * we found a left quote before the next blank 120 * now we have to find the matching right quote 121 */ 122 next = strchr(quote + 1, '"'); 123 if (next) { 124 quote = strchr(next + 1, '"'); 125 next = strchr(next + 1, ' '); 126 } 127 } 128 129 if (!next) 130 next = bootargs + strlen(bootargs); 131 132 linux_cmdline_set(bootargs, next - bootargs); 133 134 if (*next) 135 next++; 136 137 bootargs = next; 138 } 139 } 140 141 static void boot_cmdline_linux(bootm_headers_t *images) 142 { 143 if (mips_boot_cmdline_legacy) { 144 linux_cmdline_legacy(images); 145 linux_cmdline_dump(); 146 } 147 } 148 149 static void linux_env_init(void) 150 { 151 linux_env = (char **)(((ulong) linux_argp + 15) & ~15); 152 linux_env[0] = 0; 153 linux_env_p = (char *)(linux_env + LINUX_MAX_ENVS); 154 linux_env_idx = 0; 155 } 156 157 static void linux_env_set(const char *env_name, const char *env_val) 158 { 159 if (linux_env_idx < LINUX_MAX_ENVS - 1) { 160 linux_env[linux_env_idx] = linux_env_p; 161 162 strcpy(linux_env_p, env_name); 163 linux_env_p += strlen(env_name); 164 165 if (mips_boot_malta) { 166 linux_env_p++; 167 linux_env[++linux_env_idx] = linux_env_p; 168 } else { 169 *linux_env_p++ = '='; 170 } 171 172 strcpy(linux_env_p, env_val); 173 linux_env_p += strlen(env_val); 174 175 linux_env_p++; 176 linux_env[++linux_env_idx] = 0; 177 } 178 } 179 180 static void boot_prep_linux(bootm_headers_t *images) 181 { 182 char env_buf[12]; 183 const char *cp; 184 ulong rd_start, rd_size; 185 186 #ifdef CONFIG_MEMSIZE_IN_BYTES 187 sprintf(env_buf, "%lu", (ulong)gd->ram_size); 188 debug("## Giving linux memsize in bytes, %lu\n", (ulong)gd->ram_size); 189 #else 190 sprintf(env_buf, "%lu", (ulong)(gd->ram_size >> 20)); 191 debug("## Giving linux memsize in MB, %lu\n", 192 (ulong)(gd->ram_size >> 20)); 193 #endif /* CONFIG_MEMSIZE_IN_BYTES */ 194 195 rd_start = UNCACHED_SDRAM(images->initrd_start); 196 rd_size = images->initrd_end - images->initrd_start; 197 198 linux_env_init(); 199 200 linux_env_set("memsize", env_buf); 201 202 sprintf(env_buf, "0x%08lX", rd_start); 203 linux_env_set("initrd_start", env_buf); 204 205 sprintf(env_buf, "0x%lX", rd_size); 206 linux_env_set("initrd_size", env_buf); 207 208 sprintf(env_buf, "0x%08X", (uint) (gd->bd->bi_flashstart)); 209 linux_env_set("flash_start", env_buf); 210 211 sprintf(env_buf, "0x%X", (uint) (gd->bd->bi_flashsize)); 212 linux_env_set("flash_size", env_buf); 213 214 cp = getenv("ethaddr"); 215 if (cp) 216 linux_env_set("ethaddr", cp); 217 218 cp = getenv("eth1addr"); 219 if (cp) 220 linux_env_set("eth1addr", cp); 221 222 if (mips_boot_malta) { 223 sprintf(env_buf, "%un8r", gd->baudrate); 224 linux_env_set("modetty0", env_buf); 225 } 226 } 227 228 static void boot_jump_linux(bootm_headers_t *images) 229 { 230 typedef void __noreturn (*kernel_entry_t)(int, ulong, ulong, ulong); 231 kernel_entry_t kernel = (kernel_entry_t) images->ep; 232 ulong linux_extra = 0; 233 234 debug("## Transferring control to Linux (at address %p) ...\n", kernel); 235 236 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 237 238 if (mips_boot_malta) 239 linux_extra = gd->ram_size; 240 241 /* we assume that the kernel is in place */ 242 printf("\nStarting kernel ...\n\n"); 243 244 kernel(linux_argc, (ulong)linux_argv, (ulong)linux_env, linux_extra); 245 } 246 247 int do_bootm_linux(int flag, int argc, char * const argv[], 248 bootm_headers_t *images) 249 { 250 int ret; 251 252 /* No need for those on MIPS */ 253 if (flag & BOOTM_STATE_OS_BD_T) 254 return -1; 255 256 if (flag & BOOTM_STATE_OS_CMDLINE) { 257 boot_cmdline_linux(images); 258 return 0; 259 } 260 261 if (flag & BOOTM_STATE_OS_PREP) { 262 boot_prep_linux(images); 263 return 0; 264 } 265 266 if (flag & BOOTM_STATE_OS_GO) { 267 boot_jump_linux(images); 268 return 0; 269 } 270 271 ret = boot_setup_linux(images); 272 if (ret) 273 return ret; 274 275 boot_cmdline_linux(images); 276 boot_prep_linux(images); 277 boot_jump_linux(images); 278 279 /* does not return */ 280 return 1; 281 } 282