1 // SPDX-License-Identifier: GPL-2.0+ 2 /* Copyright (C) 2011 3 * Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de> 4 * - Added prep subcommand support 5 * - Reorganized source - modeled after powerpc version 6 * 7 * (C) Copyright 2002 8 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 9 * Marius Groeger <mgroeger@sysgo.de> 10 * 11 * Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) 12 */ 13 14 #include <common.h> 15 #include <command.h> 16 #include <dm.h> 17 #include <dm/root.h> 18 #include <image.h> 19 #include <u-boot/zlib.h> 20 #include <asm/byteorder.h> 21 #include <linux/libfdt.h> 22 #include <mapmem.h> 23 #include <fdt_support.h> 24 #include <asm/bootm.h> 25 #include <asm/secure.h> 26 #include <linux/compiler.h> 27 #include <bootm.h> 28 #include <vxworks.h> 29 30 #ifdef CONFIG_ARMV7_NONSEC 31 #include <asm/armv7.h> 32 #endif 33 #include <asm/setup.h> 34 35 DECLARE_GLOBAL_DATA_PTR; 36 37 static struct tag *params; 38 39 static ulong get_sp(void) 40 { 41 ulong ret; 42 43 asm("mov %0, sp" : "=r"(ret) : ); 44 return ret; 45 } 46 47 void arch_lmb_reserve(struct lmb *lmb) 48 { 49 ulong sp, bank_end; 50 int bank; 51 52 /* 53 * Booting a (Linux) kernel image 54 * 55 * Allocate space for command line and board info - the 56 * address should be as high as possible within the reach of 57 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused 58 * memory, which means far enough below the current stack 59 * pointer. 60 */ 61 sp = get_sp(); 62 debug("## Current stack ends at 0x%08lx ", sp); 63 64 /* adjust sp by 4K to be safe */ 65 sp -= 4096; 66 for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) { 67 if (!gd->bd->bi_dram[bank].size || 68 sp < gd->bd->bi_dram[bank].start) 69 continue; 70 /* Watch out for RAM at end of address space! */ 71 bank_end = gd->bd->bi_dram[bank].start + 72 gd->bd->bi_dram[bank].size - 1; 73 if (sp > bank_end) 74 continue; 75 lmb_reserve(lmb, sp, bank_end - sp + 1); 76 break; 77 } 78 } 79 80 __weak void board_quiesce_devices(void) 81 { 82 } 83 84 /** 85 * announce_and_cleanup() - Print message and prepare for kernel boot 86 * 87 * @fake: non-zero to do everything except actually boot 88 */ 89 static void announce_and_cleanup(int fake) 90 { 91 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel"); 92 #ifdef CONFIG_BOOTSTAGE_FDT 93 bootstage_fdt_add_report(); 94 #endif 95 #ifdef CONFIG_BOOTSTAGE_REPORT 96 bootstage_report(); 97 #endif 98 99 #ifdef CONFIG_USB_DEVICE 100 udc_disconnect(); 101 #endif 102 103 board_quiesce_devices(); 104 105 printf("\nStarting kernel ...%s\n\n", fake ? 106 "(fake run for tracing)" : ""); 107 /* 108 * Call remove function of all devices with a removal flag set. 109 * This may be useful for last-stage operations, like cancelling 110 * of DMA operation or releasing device internal buffers. 111 */ 112 dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL); 113 114 cleanup_before_linux(); 115 } 116 117 static void setup_start_tag (bd_t *bd) 118 { 119 params = (struct tag *)bd->bi_boot_params; 120 121 params->hdr.tag = ATAG_CORE; 122 params->hdr.size = tag_size (tag_core); 123 124 params->u.core.flags = 0; 125 params->u.core.pagesize = 0; 126 params->u.core.rootdev = 0; 127 128 params = tag_next (params); 129 } 130 131 static void setup_memory_tags(bd_t *bd) 132 { 133 int i; 134 135 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { 136 params->hdr.tag = ATAG_MEM; 137 params->hdr.size = tag_size (tag_mem32); 138 139 params->u.mem.start = bd->bi_dram[i].start; 140 params->u.mem.size = bd->bi_dram[i].size; 141 142 params = tag_next (params); 143 } 144 } 145 146 static void setup_commandline_tag(bd_t *bd, char *commandline) 147 { 148 char *p; 149 150 if (!commandline) 151 return; 152 153 /* eat leading white space */ 154 for (p = commandline; *p == ' '; p++); 155 156 /* skip non-existent command lines so the kernel will still 157 * use its default command line. 158 */ 159 if (*p == '\0') 160 return; 161 162 params->hdr.tag = ATAG_CMDLINE; 163 params->hdr.size = 164 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2; 165 166 strcpy (params->u.cmdline.cmdline, p); 167 168 params = tag_next (params); 169 } 170 171 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end) 172 { 173 /* an ATAG_INITRD node tells the kernel where the compressed 174 * ramdisk can be found. ATAG_RDIMG is a better name, actually. 175 */ 176 params->hdr.tag = ATAG_INITRD2; 177 params->hdr.size = tag_size (tag_initrd); 178 179 params->u.initrd.start = initrd_start; 180 params->u.initrd.size = initrd_end - initrd_start; 181 182 params = tag_next (params); 183 } 184 185 static void setup_serial_tag(struct tag **tmp) 186 { 187 struct tag *params = *tmp; 188 struct tag_serialnr serialnr; 189 190 get_board_serial(&serialnr); 191 params->hdr.tag = ATAG_SERIAL; 192 params->hdr.size = tag_size (tag_serialnr); 193 params->u.serialnr.low = serialnr.low; 194 params->u.serialnr.high= serialnr.high; 195 params = tag_next (params); 196 *tmp = params; 197 } 198 199 static void setup_revision_tag(struct tag **in_params) 200 { 201 u32 rev = 0; 202 203 rev = get_board_rev(); 204 params->hdr.tag = ATAG_REVISION; 205 params->hdr.size = tag_size (tag_revision); 206 params->u.revision.rev = rev; 207 params = tag_next (params); 208 } 209 210 static void setup_end_tag(bd_t *bd) 211 { 212 params->hdr.tag = ATAG_NONE; 213 params->hdr.size = 0; 214 } 215 216 __weak void setup_board_tags(struct tag **in_params) {} 217 218 #ifdef CONFIG_ARM64 219 static void do_nonsec_virt_switch(void) 220 { 221 smp_kick_all_cpus(); 222 dcache_disable(); /* flush cache before swtiching to EL2 */ 223 } 224 #endif 225 226 /* Subcommand: PREP */ 227 static void boot_prep_linux(bootm_headers_t *images) 228 { 229 char *commandline = env_get("bootargs"); 230 231 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { 232 #ifdef CONFIG_OF_LIBFDT 233 debug("using: FDT\n"); 234 if (image_setup_linux(images)) { 235 printf("FDT creation failed! hanging..."); 236 hang(); 237 } 238 #endif 239 } else if (BOOTM_ENABLE_TAGS) { 240 debug("using: ATAGS\n"); 241 setup_start_tag(gd->bd); 242 if (BOOTM_ENABLE_SERIAL_TAG) 243 setup_serial_tag(¶ms); 244 if (BOOTM_ENABLE_CMDLINE_TAG) 245 setup_commandline_tag(gd->bd, commandline); 246 if (BOOTM_ENABLE_REVISION_TAG) 247 setup_revision_tag(¶ms); 248 if (BOOTM_ENABLE_MEMORY_TAGS) 249 setup_memory_tags(gd->bd); 250 if (BOOTM_ENABLE_INITRD_TAG) { 251 /* 252 * In boot_ramdisk_high(), it may relocate ramdisk to 253 * a specified location. And set images->initrd_start & 254 * images->initrd_end to relocated ramdisk's start/end 255 * addresses. So use them instead of images->rd_start & 256 * images->rd_end when possible. 257 */ 258 if (images->initrd_start && images->initrd_end) { 259 setup_initrd_tag(gd->bd, images->initrd_start, 260 images->initrd_end); 261 } else if (images->rd_start && images->rd_end) { 262 setup_initrd_tag(gd->bd, images->rd_start, 263 images->rd_end); 264 } 265 } 266 setup_board_tags(¶ms); 267 setup_end_tag(gd->bd); 268 } else { 269 printf("FDT and ATAGS support not compiled in - hanging\n"); 270 hang(); 271 } 272 } 273 274 __weak bool armv7_boot_nonsec_default(void) 275 { 276 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT 277 return false; 278 #else 279 return true; 280 #endif 281 } 282 283 #ifdef CONFIG_ARMV7_NONSEC 284 bool armv7_boot_nonsec(void) 285 { 286 char *s = env_get("bootm_boot_mode"); 287 bool nonsec = armv7_boot_nonsec_default(); 288 289 if (s && !strcmp(s, "sec")) 290 nonsec = false; 291 292 if (s && !strcmp(s, "nonsec")) 293 nonsec = true; 294 295 return nonsec; 296 } 297 #endif 298 299 #ifdef CONFIG_ARM64 300 __weak void update_os_arch_secondary_cores(uint8_t os_arch) 301 { 302 } 303 304 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1 305 static void switch_to_el1(void) 306 { 307 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) && 308 (images.os.arch == IH_ARCH_ARM)) 309 armv8_switch_to_el1(0, (u64)gd->bd->bi_arch_number, 310 (u64)images.ft_addr, 0, 311 (u64)images.ep, 312 ES_TO_AARCH32); 313 else 314 armv8_switch_to_el1((u64)images.ft_addr, 0, 0, 0, 315 images.ep, 316 ES_TO_AARCH64); 317 } 318 #endif 319 #endif 320 321 /* Subcommand: GO */ 322 static void boot_jump_linux(bootm_headers_t *images, int flag) 323 { 324 #ifdef CONFIG_ARM64 325 void (*kernel_entry)(void *fdt_addr, void *res0, void *res1, 326 void *res2); 327 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 328 329 kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1, 330 void *res2))images->ep; 331 332 debug("## Transferring control to Linux (at address %lx)...\n", 333 (ulong) kernel_entry); 334 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 335 336 announce_and_cleanup(fake); 337 338 if (!fake) { 339 #ifdef CONFIG_ARMV8_PSCI 340 armv8_setup_psci(); 341 #endif 342 do_nonsec_virt_switch(); 343 344 update_os_arch_secondary_cores(images->os.arch); 345 346 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1 347 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0, 348 (u64)switch_to_el1, ES_TO_AARCH64); 349 #else 350 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) && 351 (images->os.arch == IH_ARCH_ARM)) 352 armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number, 353 (u64)images->ft_addr, 0, 354 (u64)images->ep, 355 ES_TO_AARCH32); 356 else 357 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0, 358 images->ep, 359 ES_TO_AARCH64); 360 #endif 361 } 362 #else 363 unsigned long machid = gd->bd->bi_arch_number; 364 char *s; 365 void (*kernel_entry)(int zero, int arch, uint params); 366 unsigned long r2; 367 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 368 369 kernel_entry = (void (*)(int, int, uint))images->ep; 370 #ifdef CONFIG_CPU_V7M 371 ulong addr = (ulong)kernel_entry | 1; 372 kernel_entry = (void *)addr; 373 #endif 374 s = env_get("machid"); 375 if (s) { 376 if (strict_strtoul(s, 16, &machid) < 0) { 377 debug("strict_strtoul failed!\n"); 378 return; 379 } 380 printf("Using machid 0x%lx from environment\n", machid); 381 } 382 383 debug("## Transferring control to Linux (at address %08lx)" \ 384 "...\n", (ulong) kernel_entry); 385 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 386 announce_and_cleanup(fake); 387 388 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) 389 r2 = (unsigned long)images->ft_addr; 390 else 391 r2 = gd->bd->bi_boot_params; 392 393 if (!fake) { 394 #ifdef CONFIG_ARMV7_NONSEC 395 if (armv7_boot_nonsec()) { 396 armv7_init_nonsec(); 397 secure_ram_addr(_do_nonsec_entry)(kernel_entry, 398 0, machid, r2); 399 } else 400 #endif 401 kernel_entry(0, machid, r2); 402 } 403 #endif 404 } 405 406 /* Main Entry point for arm bootm implementation 407 * 408 * Modeled after the powerpc implementation 409 * DIFFERENCE: Instead of calling prep and go at the end 410 * they are called if subcommand is equal 0. 411 */ 412 int do_bootm_linux(int flag, int argc, char * const argv[], 413 bootm_headers_t *images) 414 { 415 /* No need for those on ARM */ 416 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE) 417 return -1; 418 419 if (flag & BOOTM_STATE_OS_PREP) { 420 boot_prep_linux(images); 421 return 0; 422 } 423 424 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { 425 boot_jump_linux(images, flag); 426 return 0; 427 } 428 429 boot_prep_linux(images); 430 boot_jump_linux(images, flag); 431 return 0; 432 } 433 434 #if defined(CONFIG_BOOTM_VXWORKS) 435 void boot_prep_vxworks(bootm_headers_t *images) 436 { 437 #if defined(CONFIG_OF_LIBFDT) 438 int off; 439 440 if (images->ft_addr) { 441 off = fdt_path_offset(images->ft_addr, "/memory"); 442 if (off > 0) { 443 if (arch_fixup_fdt(images->ft_addr)) 444 puts("## WARNING: fixup memory failed!\n"); 445 } 446 } 447 #endif 448 cleanup_before_linux(); 449 } 450 void boot_jump_vxworks(bootm_headers_t *images) 451 { 452 #if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI) 453 armv8_setup_psci(); 454 smp_kick_all_cpus(); 455 #endif 456 457 /* ARM VxWorks requires device tree physical address to be passed */ 458 ((void (*)(void *))images->ep)(images->ft_addr); 459 } 460 #endif 461