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 armv8_switch_to_el2(); 204 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1 205 armv8_switch_to_el1(); 206 #endif 207 } 208 #endif 209 210 /* Subcommand: PREP */ 211 static void boot_prep_linux(bootm_headers_t *images) 212 { 213 char *commandline = getenv("bootargs"); 214 215 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { 216 #ifdef CONFIG_OF_LIBFDT 217 debug("using: FDT\n"); 218 if (image_setup_linux(images)) { 219 printf("FDT creation failed! hanging..."); 220 hang(); 221 } 222 #endif 223 } else if (BOOTM_ENABLE_TAGS) { 224 debug("using: ATAGS\n"); 225 setup_start_tag(gd->bd); 226 if (BOOTM_ENABLE_SERIAL_TAG) 227 setup_serial_tag(¶ms); 228 if (BOOTM_ENABLE_CMDLINE_TAG) 229 setup_commandline_tag(gd->bd, commandline); 230 if (BOOTM_ENABLE_REVISION_TAG) 231 setup_revision_tag(¶ms); 232 if (BOOTM_ENABLE_MEMORY_TAGS) 233 setup_memory_tags(gd->bd); 234 if (BOOTM_ENABLE_INITRD_TAG) { 235 /* 236 * In boot_ramdisk_high(), it may relocate ramdisk to 237 * a specified location. And set images->initrd_start & 238 * images->initrd_end to relocated ramdisk's start/end 239 * addresses. So use them instead of images->rd_start & 240 * images->rd_end when possible. 241 */ 242 if (images->initrd_start && images->initrd_end) { 243 setup_initrd_tag(gd->bd, images->initrd_start, 244 images->initrd_end); 245 } else if (images->rd_start && images->rd_end) { 246 setup_initrd_tag(gd->bd, images->rd_start, 247 images->rd_end); 248 } 249 } 250 setup_board_tags(¶ms); 251 setup_end_tag(gd->bd); 252 } else { 253 printf("FDT and ATAGS support not compiled in - hanging\n"); 254 hang(); 255 } 256 } 257 258 __weak bool armv7_boot_nonsec_default(void) 259 { 260 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT 261 return false; 262 #else 263 return true; 264 #endif 265 } 266 267 #ifdef CONFIG_ARMV7_NONSEC 268 bool armv7_boot_nonsec(void) 269 { 270 char *s = getenv("bootm_boot_mode"); 271 bool nonsec = armv7_boot_nonsec_default(); 272 273 if (s && !strcmp(s, "sec")) 274 nonsec = false; 275 276 if (s && !strcmp(s, "nonsec")) 277 nonsec = true; 278 279 return nonsec; 280 } 281 #endif 282 283 /* Subcommand: GO */ 284 static void boot_jump_linux(bootm_headers_t *images, int flag) 285 { 286 #ifdef CONFIG_ARM64 287 void (*kernel_entry)(void *fdt_addr, void *res0, void *res1, 288 void *res2); 289 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 290 291 kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1, 292 void *res2))images->ep; 293 294 debug("## Transferring control to Linux (at address %lx)...\n", 295 (ulong) kernel_entry); 296 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 297 298 announce_and_cleanup(fake); 299 300 if (!fake) { 301 do_nonsec_virt_switch(); 302 kernel_entry(images->ft_addr, NULL, NULL, NULL); 303 } 304 #else 305 unsigned long machid = gd->bd->bi_arch_number; 306 char *s; 307 void (*kernel_entry)(int zero, int arch, uint params); 308 unsigned long r2; 309 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 310 311 kernel_entry = (void (*)(int, int, uint))images->ep; 312 313 s = getenv("machid"); 314 if (s) { 315 if (strict_strtoul(s, 16, &machid) < 0) { 316 debug("strict_strtoul failed!\n"); 317 return; 318 } 319 printf("Using machid 0x%lx from environment\n", machid); 320 } 321 322 debug("## Transferring control to Linux (at address %08lx)" \ 323 "...\n", (ulong) kernel_entry); 324 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 325 announce_and_cleanup(fake); 326 327 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) 328 r2 = (unsigned long)images->ft_addr; 329 else 330 r2 = gd->bd->bi_boot_params; 331 332 if (!fake) { 333 #ifdef CONFIG_ARMV7_NONSEC 334 if (armv7_boot_nonsec()) { 335 armv7_init_nonsec(); 336 secure_ram_addr(_do_nonsec_entry)(kernel_entry, 337 0, machid, r2); 338 } else 339 #endif 340 kernel_entry(0, machid, r2); 341 } 342 #endif 343 } 344 345 /* Main Entry point for arm bootm implementation 346 * 347 * Modeled after the powerpc implementation 348 * DIFFERENCE: Instead of calling prep and go at the end 349 * they are called if subcommand is equal 0. 350 */ 351 int do_bootm_linux(int flag, int argc, char * const argv[], 352 bootm_headers_t *images) 353 { 354 /* No need for those on ARM */ 355 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE) 356 return -1; 357 358 if (flag & BOOTM_STATE_OS_PREP) { 359 boot_prep_linux(images); 360 return 0; 361 } 362 363 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { 364 boot_jump_linux(images, flag); 365 return 0; 366 } 367 368 boot_prep_linux(images); 369 boot_jump_linux(images, flag); 370 return 0; 371 } 372 373 #if defined(CONFIG_BOOTM_VXWORKS) 374 void boot_prep_vxworks(bootm_headers_t *images) 375 { 376 #if defined(CONFIG_OF_LIBFDT) 377 int off; 378 379 if (images->ft_addr) { 380 off = fdt_path_offset(images->ft_addr, "/memory"); 381 if (off < 0) { 382 #ifdef CONFIG_ARCH_FIXUP_FDT 383 if (arch_fixup_fdt(images->ft_addr)) 384 puts("## WARNING: fixup memory failed!\n"); 385 #endif 386 } 387 } 388 #endif 389 cleanup_before_linux(); 390 } 391 void boot_jump_vxworks(bootm_headers_t *images) 392 { 393 /* ARM VxWorks requires device tree physical address to be passed */ 394 ((void (*)(void *))images->ep)(images->ft_addr); 395 } 396 #endif 397