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