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