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