1 /* 2 * (C) Copyright 2000 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 <cli.h> 10 #include <fdtdec.h> 11 #include <menu.h> 12 #include <post.h> 13 14 DECLARE_GLOBAL_DATA_PTR; 15 16 #define MAX_DELAY_STOP_STR 32 17 18 #ifndef DEBUG_BOOTKEYS 19 #define DEBUG_BOOTKEYS 0 20 #endif 21 #define debug_bootkeys(fmt, args...) \ 22 debug_cond(DEBUG_BOOTKEYS, fmt, ##args) 23 24 /*************************************************************************** 25 * Watch for 'delay' seconds for autoboot stop or autoboot delay string. 26 * returns: 0 - no key string, allow autoboot 1 - got key string, abort 27 */ 28 # if defined(CONFIG_AUTOBOOT_KEYED) 29 static int abortboot_keyed(int bootdelay) 30 { 31 int abort = 0; 32 uint64_t etime = endtick(bootdelay); 33 struct { 34 char *str; 35 u_int len; 36 int retry; 37 } 38 delaykey[] = { 39 { str: getenv("bootdelaykey"), retry: 1 }, 40 { str: getenv("bootdelaykey2"), retry: 1 }, 41 { str: getenv("bootstopkey"), retry: 0 }, 42 { str: getenv("bootstopkey2"), retry: 0 }, 43 }; 44 45 char presskey[MAX_DELAY_STOP_STR]; 46 u_int presskey_len = 0; 47 u_int presskey_max = 0; 48 u_int i; 49 50 #ifndef CONFIG_ZERO_BOOTDELAY_CHECK 51 if (bootdelay == 0) 52 return 0; 53 #endif 54 55 # ifdef CONFIG_AUTOBOOT_PROMPT 56 printf(CONFIG_AUTOBOOT_PROMPT); 57 # endif 58 59 # ifdef CONFIG_AUTOBOOT_DELAY_STR 60 if (delaykey[0].str == NULL) 61 delaykey[0].str = CONFIG_AUTOBOOT_DELAY_STR; 62 # endif 63 # ifdef CONFIG_AUTOBOOT_DELAY_STR2 64 if (delaykey[1].str == NULL) 65 delaykey[1].str = CONFIG_AUTOBOOT_DELAY_STR2; 66 # endif 67 # ifdef CONFIG_AUTOBOOT_STOP_STR 68 if (delaykey[2].str == NULL) 69 delaykey[2].str = CONFIG_AUTOBOOT_STOP_STR; 70 # endif 71 # ifdef CONFIG_AUTOBOOT_STOP_STR2 72 if (delaykey[3].str == NULL) 73 delaykey[3].str = CONFIG_AUTOBOOT_STOP_STR2; 74 # endif 75 76 for (i = 0; i < sizeof(delaykey) / sizeof(delaykey[0]); i++) { 77 delaykey[i].len = delaykey[i].str == NULL ? 78 0 : strlen(delaykey[i].str); 79 delaykey[i].len = delaykey[i].len > MAX_DELAY_STOP_STR ? 80 MAX_DELAY_STOP_STR : delaykey[i].len; 81 82 presskey_max = presskey_max > delaykey[i].len ? 83 presskey_max : delaykey[i].len; 84 85 debug_bootkeys("%s key:<%s>\n", 86 delaykey[i].retry ? "delay" : "stop", 87 delaykey[i].str ? delaykey[i].str : "NULL"); 88 } 89 90 /* In order to keep up with incoming data, check timeout only 91 * when catch up. 92 */ 93 do { 94 if (tstc()) { 95 if (presskey_len < presskey_max) { 96 presskey[presskey_len++] = getc(); 97 } else { 98 for (i = 0; i < presskey_max - 1; i++) 99 presskey[i] = presskey[i + 1]; 100 101 presskey[i] = getc(); 102 } 103 } 104 105 for (i = 0; i < sizeof(delaykey) / sizeof(delaykey[0]); i++) { 106 if (delaykey[i].len > 0 && 107 presskey_len >= delaykey[i].len && 108 memcmp(presskey + presskey_len - 109 delaykey[i].len, delaykey[i].str, 110 delaykey[i].len) == 0) { 111 debug_bootkeys("got %skey\n", 112 delaykey[i].retry ? "delay" : 113 "stop"); 114 115 # ifdef CONFIG_BOOT_RETRY_TIME 116 /* don't retry auto boot */ 117 if (!delaykey[i].retry) 118 bootretry_dont_retry(); 119 # endif 120 abort = 1; 121 } 122 } 123 } while (!abort && get_ticks() <= etime); 124 125 if (!abort) 126 debug_bootkeys("key timeout\n"); 127 128 #ifdef CONFIG_SILENT_CONSOLE 129 if (abort) 130 gd->flags &= ~GD_FLG_SILENT; 131 #endif 132 133 return abort; 134 } 135 136 # else /* !defined(CONFIG_AUTOBOOT_KEYED) */ 137 138 #ifdef CONFIG_MENUKEY 139 static int menukey; 140 #endif 141 142 static int abortboot_normal(int bootdelay) 143 { 144 int abort = 0; 145 unsigned long ts; 146 147 #ifdef CONFIG_MENUPROMPT 148 printf(CONFIG_MENUPROMPT); 149 #else 150 if (bootdelay >= 0) 151 printf("Hit any key to stop autoboot: %2d ", bootdelay); 152 #endif 153 154 #if defined CONFIG_ZERO_BOOTDELAY_CHECK 155 /* 156 * Check if key already pressed 157 * Don't check if bootdelay < 0 158 */ 159 if (bootdelay >= 0) { 160 if (tstc()) { /* we got a key press */ 161 (void) getc(); /* consume input */ 162 puts("\b\b\b 0"); 163 abort = 1; /* don't auto boot */ 164 } 165 } 166 #endif 167 168 while ((bootdelay > 0) && (!abort)) { 169 --bootdelay; 170 /* delay 1000 ms */ 171 ts = get_timer(0); 172 do { 173 if (tstc()) { /* we got a key press */ 174 abort = 1; /* don't auto boot */ 175 bootdelay = 0; /* no more delay */ 176 # ifdef CONFIG_MENUKEY 177 menukey = getc(); 178 # else 179 (void) getc(); /* consume input */ 180 # endif 181 break; 182 } 183 udelay(10000); 184 } while (!abort && get_timer(ts) < 1000); 185 186 printf("\b\b\b%2d ", bootdelay); 187 } 188 189 putc('\n'); 190 191 #ifdef CONFIG_SILENT_CONSOLE 192 if (abort) 193 gd->flags &= ~GD_FLG_SILENT; 194 #endif 195 196 return abort; 197 } 198 # endif /* CONFIG_AUTOBOOT_KEYED */ 199 200 static int abortboot(int bootdelay) 201 { 202 #ifdef CONFIG_AUTOBOOT_KEYED 203 return abortboot_keyed(bootdelay); 204 #else 205 return abortboot_normal(bootdelay); 206 #endif 207 } 208 209 /* 210 * Runs the given boot command securely. Specifically: 211 * - Doesn't run the command with the shell (run_command or parse_string_outer), 212 * since that's a lot of code surface that an attacker might exploit. 213 * Because of this, we don't do any argument parsing--the secure boot command 214 * has to be a full-fledged u-boot command. 215 * - Doesn't check for keypresses before booting, since that could be a 216 * security hole; also disables Ctrl-C. 217 * - Doesn't allow the command to return. 218 * 219 * Upon any failures, this function will drop into an infinite loop after 220 * printing the error message to console. 221 */ 222 223 #if defined(CONFIG_OF_CONTROL) 224 static void secure_boot_cmd(char *cmd) 225 { 226 cmd_tbl_t *cmdtp; 227 int rc; 228 229 if (!cmd) { 230 printf("## Error: Secure boot command not specified\n"); 231 goto err; 232 } 233 234 /* Disable Ctrl-C just in case some command is used that checks it. */ 235 disable_ctrlc(1); 236 237 /* Find the command directly. */ 238 cmdtp = find_cmd(cmd); 239 if (!cmdtp) { 240 printf("## Error: \"%s\" not defined\n", cmd); 241 goto err; 242 } 243 244 /* Run the command, forcing no flags and faking argc and argv. */ 245 rc = (cmdtp->cmd)(cmdtp, 0, 1, &cmd); 246 247 /* Shouldn't ever return from boot command. */ 248 printf("## Error: \"%s\" returned (code %d)\n", cmd, rc); 249 250 err: 251 /* 252 * Not a whole lot to do here. Rebooting won't help much, since we'll 253 * just end up right back here. Just loop. 254 */ 255 hang(); 256 } 257 258 static void process_fdt_options(const void *blob) 259 { 260 ulong addr; 261 262 /* Add an env variable to point to a kernel payload, if available */ 263 addr = fdtdec_get_config_int(gd->fdt_blob, "kernel-offset", 0); 264 if (addr) 265 setenv_addr("kernaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr)); 266 267 /* Add an env variable to point to a root disk, if available */ 268 addr = fdtdec_get_config_int(gd->fdt_blob, "rootdisk-offset", 0); 269 if (addr) 270 setenv_addr("rootaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr)); 271 } 272 #endif /* CONFIG_OF_CONTROL */ 273 274 void bootdelay_process(void) 275 { 276 #ifdef CONFIG_OF_CONTROL 277 char *env; 278 #endif 279 char *s; 280 int bootdelay; 281 #ifdef CONFIG_BOOTCOUNT_LIMIT 282 unsigned long bootcount = 0; 283 unsigned long bootlimit = 0; 284 #endif /* CONFIG_BOOTCOUNT_LIMIT */ 285 286 #ifdef CONFIG_BOOTCOUNT_LIMIT 287 bootcount = bootcount_load(); 288 bootcount++; 289 bootcount_store(bootcount); 290 setenv_ulong("bootcount", bootcount); 291 bootlimit = getenv_ulong("bootlimit", 10, 0); 292 #endif /* CONFIG_BOOTCOUNT_LIMIT */ 293 294 s = getenv("bootdelay"); 295 bootdelay = s ? (int)simple_strtol(s, NULL, 10) : CONFIG_BOOTDELAY; 296 297 #ifdef CONFIG_OF_CONTROL 298 bootdelay = fdtdec_get_config_int(gd->fdt_blob, "bootdelay", 299 bootdelay); 300 #endif 301 302 debug("### main_loop entered: bootdelay=%d\n\n", bootdelay); 303 304 #if defined(CONFIG_MENU_SHOW) 305 bootdelay = menu_show(bootdelay); 306 #endif 307 # ifdef CONFIG_BOOT_RETRY_TIME 308 init_cmd_timeout(); 309 # endif /* CONFIG_BOOT_RETRY_TIME */ 310 311 #ifdef CONFIG_POST 312 if (gd->flags & GD_FLG_POSTFAIL) { 313 s = getenv("failbootcmd"); 314 } else 315 #endif /* CONFIG_POST */ 316 #ifdef CONFIG_BOOTCOUNT_LIMIT 317 if (bootlimit && (bootcount > bootlimit)) { 318 printf("Warning: Bootlimit (%u) exceeded. Using altbootcmd.\n", 319 (unsigned)bootlimit); 320 s = getenv("altbootcmd"); 321 } else 322 #endif /* CONFIG_BOOTCOUNT_LIMIT */ 323 s = getenv("bootcmd"); 324 #ifdef CONFIG_OF_CONTROL 325 /* Allow the fdt to override the boot command */ 326 env = fdtdec_get_config_string(gd->fdt_blob, "bootcmd"); 327 if (env) 328 s = env; 329 330 process_fdt_options(gd->fdt_blob); 331 332 /* 333 * If the bootsecure option was chosen, use secure_boot_cmd(). 334 * Always use 'env' in this case, since bootsecure requres that the 335 * bootcmd was specified in the FDT too. 336 */ 337 if (fdtdec_get_config_int(gd->fdt_blob, "bootsecure", 0)) 338 secure_boot_cmd(env); 339 340 #endif /* CONFIG_OF_CONTROL */ 341 342 debug("### main_loop: bootcmd=\"%s\"\n", s ? s : "<UNDEFINED>"); 343 344 if (bootdelay != -1 && s && !abortboot(bootdelay)) { 345 #if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC) 346 int prev = disable_ctrlc(1); /* disable Control C checking */ 347 #endif 348 349 run_command_list(s, -1, 0); 350 351 #if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC) 352 disable_ctrlc(prev); /* restore Control C checking */ 353 #endif 354 } 355 356 #ifdef CONFIG_MENUKEY 357 if (menukey == CONFIG_MENUKEY) { 358 s = getenv("menucmd"); 359 if (s) 360 run_command_list(s, -1, 0); 361 } 362 #endif /* CONFIG_MENUKEY */ 363 } 364