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 <fdt_support.h> 22 #include <asm/bootm.h> 23 #include <asm/secure.h> 24 #include <linux/compiler.h> 25 #include <bootm.h> 26 #include <vxworks.h> 27 28 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT) 29 #include <asm/armv7.h> 30 #endif 31 32 DECLARE_GLOBAL_DATA_PTR; 33 34 static struct tag *params; 35 36 static ulong get_sp(void) 37 { 38 ulong ret; 39 40 asm("mov %0, sp" : "=r"(ret) : ); 41 return ret; 42 } 43 44 void arch_lmb_reserve(struct lmb *lmb) 45 { 46 ulong sp; 47 48 /* 49 * Booting a (Linux) kernel image 50 * 51 * Allocate space for command line and board info - the 52 * address should be as high as possible within the reach of 53 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused 54 * memory, which means far enough below the current stack 55 * pointer. 56 */ 57 sp = get_sp(); 58 debug("## Current stack ends at 0x%08lx ", sp); 59 60 /* adjust sp by 4K to be safe */ 61 sp -= 4096; 62 lmb_reserve(lmb, sp, 63 gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp); 64 } 65 66 /** 67 * announce_and_cleanup() - Print message and prepare for kernel boot 68 * 69 * @fake: non-zero to do everything except actually boot 70 */ 71 static void announce_and_cleanup(int fake) 72 { 73 printf("\nStarting kernel ...%s\n\n", fake ? 74 "(fake run for tracing)" : ""); 75 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel"); 76 #ifdef CONFIG_BOOTSTAGE_FDT 77 bootstage_fdt_add_report(); 78 #endif 79 #ifdef CONFIG_BOOTSTAGE_REPORT 80 bootstage_report(); 81 #endif 82 83 #ifdef CONFIG_USB_DEVICE 84 udc_disconnect(); 85 #endif 86 cleanup_before_linux(); 87 } 88 89 static void setup_start_tag (bd_t *bd) 90 { 91 params = (struct tag *)bd->bi_boot_params; 92 93 params->hdr.tag = ATAG_CORE; 94 params->hdr.size = tag_size (tag_core); 95 96 params->u.core.flags = 0; 97 params->u.core.pagesize = 0; 98 params->u.core.rootdev = 0; 99 100 params = tag_next (params); 101 } 102 103 static void setup_memory_tags(bd_t *bd) 104 { 105 int i; 106 107 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { 108 params->hdr.tag = ATAG_MEM; 109 params->hdr.size = tag_size (tag_mem32); 110 111 params->u.mem.start = bd->bi_dram[i].start; 112 params->u.mem.size = bd->bi_dram[i].size; 113 114 params = tag_next (params); 115 } 116 } 117 118 static void setup_commandline_tag(bd_t *bd, char *commandline) 119 { 120 char *p; 121 122 if (!commandline) 123 return; 124 125 /* eat leading white space */ 126 for (p = commandline; *p == ' '; p++); 127 128 /* skip non-existent command lines so the kernel will still 129 * use its default command line. 130 */ 131 if (*p == '\0') 132 return; 133 134 params->hdr.tag = ATAG_CMDLINE; 135 params->hdr.size = 136 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2; 137 138 strcpy (params->u.cmdline.cmdline, p); 139 140 params = tag_next (params); 141 } 142 143 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end) 144 { 145 /* an ATAG_INITRD node tells the kernel where the compressed 146 * ramdisk can be found. ATAG_RDIMG is a better name, actually. 147 */ 148 params->hdr.tag = ATAG_INITRD2; 149 params->hdr.size = tag_size (tag_initrd); 150 151 params->u.initrd.start = initrd_start; 152 params->u.initrd.size = initrd_end - initrd_start; 153 154 params = tag_next (params); 155 } 156 157 static void setup_serial_tag(struct tag **tmp) 158 { 159 struct tag *params = *tmp; 160 struct tag_serialnr serialnr; 161 162 get_board_serial(&serialnr); 163 params->hdr.tag = ATAG_SERIAL; 164 params->hdr.size = tag_size (tag_serialnr); 165 params->u.serialnr.low = serialnr.low; 166 params->u.serialnr.high= serialnr.high; 167 params = tag_next (params); 168 *tmp = params; 169 } 170 171 static void setup_revision_tag(struct tag **in_params) 172 { 173 u32 rev = 0; 174 175 rev = get_board_rev(); 176 params->hdr.tag = ATAG_REVISION; 177 params->hdr.size = tag_size (tag_revision); 178 params->u.revision.rev = rev; 179 params = tag_next (params); 180 } 181 182 static void setup_end_tag(bd_t *bd) 183 { 184 params->hdr.tag = ATAG_NONE; 185 params->hdr.size = 0; 186 } 187 188 __weak void setup_board_tags(struct tag **in_params) {} 189 190 #ifdef CONFIG_ARM64 191 static void do_nonsec_virt_switch(void) 192 { 193 smp_kick_all_cpus(); 194 flush_dcache_all(); /* flush cache before swtiching to EL2 */ 195 armv8_switch_to_el2(); 196 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1 197 armv8_switch_to_el1(); 198 #endif 199 } 200 #endif 201 202 /* Subcommand: PREP */ 203 static void boot_prep_linux(bootm_headers_t *images) 204 { 205 char *commandline = getenv("bootargs"); 206 207 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { 208 #ifdef CONFIG_OF_LIBFDT 209 debug("using: FDT\n"); 210 if (image_setup_linux(images)) { 211 printf("FDT creation failed! hanging..."); 212 hang(); 213 } 214 #endif 215 } else if (BOOTM_ENABLE_TAGS) { 216 debug("using: ATAGS\n"); 217 setup_start_tag(gd->bd); 218 if (BOOTM_ENABLE_SERIAL_TAG) 219 setup_serial_tag(¶ms); 220 if (BOOTM_ENABLE_CMDLINE_TAG) 221 setup_commandline_tag(gd->bd, commandline); 222 if (BOOTM_ENABLE_REVISION_TAG) 223 setup_revision_tag(¶ms); 224 if (BOOTM_ENABLE_MEMORY_TAGS) 225 setup_memory_tags(gd->bd); 226 if (BOOTM_ENABLE_INITRD_TAG) { 227 if (images->rd_start && images->rd_end) { 228 setup_initrd_tag(gd->bd, images->rd_start, 229 images->rd_end); 230 } 231 } 232 setup_board_tags(¶ms); 233 setup_end_tag(gd->bd); 234 } else { 235 printf("FDT and ATAGS support not compiled in - hanging\n"); 236 hang(); 237 } 238 } 239 240 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT) 241 bool armv7_boot_nonsec(void) 242 { 243 char *s = getenv("bootm_boot_mode"); 244 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT 245 bool nonsec = false; 246 #else 247 bool nonsec = true; 248 #endif 249 250 if (s && !strcmp(s, "sec")) 251 nonsec = false; 252 253 if (s && !strcmp(s, "nonsec")) 254 nonsec = true; 255 256 return nonsec; 257 } 258 #endif 259 260 /* Subcommand: GO */ 261 static void boot_jump_linux(bootm_headers_t *images, int flag) 262 { 263 #ifdef CONFIG_ARM64 264 void (*kernel_entry)(void *fdt_addr, void *res0, void *res1, 265 void *res2); 266 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 267 268 kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1, 269 void *res2))images->ep; 270 271 debug("## Transferring control to Linux (at address %lx)...\n", 272 (ulong) kernel_entry); 273 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 274 275 announce_and_cleanup(fake); 276 277 if (!fake) { 278 do_nonsec_virt_switch(); 279 kernel_entry(images->ft_addr, NULL, NULL, NULL); 280 } 281 #else 282 unsigned long machid = gd->bd->bi_arch_number; 283 char *s; 284 void (*kernel_entry)(int zero, int arch, uint params); 285 unsigned long r2; 286 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 287 288 kernel_entry = (void (*)(int, int, uint))images->ep; 289 290 s = getenv("machid"); 291 if (s) { 292 strict_strtoul(s, 16, &machid); 293 printf("Using machid 0x%lx from environment\n", machid); 294 } 295 296 debug("## Transferring control to Linux (at address %08lx)" \ 297 "...\n", (ulong) kernel_entry); 298 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 299 announce_and_cleanup(fake); 300 301 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) 302 r2 = (unsigned long)images->ft_addr; 303 else 304 r2 = gd->bd->bi_boot_params; 305 306 if (!fake) { 307 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT) 308 if (armv7_boot_nonsec()) { 309 armv7_init_nonsec(); 310 secure_ram_addr(_do_nonsec_entry)(kernel_entry, 311 0, machid, r2); 312 } else 313 #endif 314 kernel_entry(0, machid, r2); 315 } 316 #endif 317 } 318 319 /* Main Entry point for arm bootm implementation 320 * 321 * Modeled after the powerpc implementation 322 * DIFFERENCE: Instead of calling prep and go at the end 323 * they are called if subcommand is equal 0. 324 */ 325 int do_bootm_linux(int flag, int argc, char * const argv[], 326 bootm_headers_t *images) 327 { 328 /* No need for those on ARM */ 329 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE) 330 return -1; 331 332 if (flag & BOOTM_STATE_OS_PREP) { 333 boot_prep_linux(images); 334 return 0; 335 } 336 337 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { 338 boot_jump_linux(images, flag); 339 return 0; 340 } 341 342 boot_prep_linux(images); 343 boot_jump_linux(images, flag); 344 return 0; 345 } 346 347 #ifdef CONFIG_CMD_BOOTZ 348 349 struct zimage_header { 350 uint32_t code[9]; 351 uint32_t zi_magic; 352 uint32_t zi_start; 353 uint32_t zi_end; 354 }; 355 356 #define LINUX_ARM_ZIMAGE_MAGIC 0x016f2818 357 358 int bootz_setup(ulong image, ulong *start, ulong *end) 359 { 360 struct zimage_header *zi; 361 362 zi = (struct zimage_header *)map_sysmem(image, 0); 363 if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) { 364 puts("Bad Linux ARM zImage magic!\n"); 365 return 1; 366 } 367 368 *start = zi->zi_start; 369 *end = zi->zi_end; 370 371 printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n", image, *start, 372 *end); 373 374 return 0; 375 } 376 377 #endif /* CONFIG_CMD_BOOTZ */ 378 379 #if defined(CONFIG_BOOTM_VXWORKS) 380 void boot_prep_vxworks(bootm_headers_t *images) 381 { 382 #if defined(CONFIG_OF_LIBFDT) 383 int off; 384 385 if (images->ft_addr) { 386 off = fdt_path_offset(images->ft_addr, "/memory"); 387 if (off < 0) { 388 if (arch_fixup_fdt(images->ft_addr)) 389 puts("## WARNING: fixup memory failed!\n"); 390 } 391 } 392 #endif 393 cleanup_before_linux(); 394 } 395 void boot_jump_vxworks(bootm_headers_t *images) 396 { 397 /* ARM VxWorks requires device tree physical address to be passed */ 398 ((void (*)(void *))images->ep)(images->ft_addr); 399 } 400 #endif 401