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 <vxworks.h> 19 #include <u-boot/zlib.h> 20 #include <asm/byteorder.h> 21 #include <libfdt.h> 22 #include <fdt_support.h> 23 #include <asm/bootm.h> 24 #include <asm/secure.h> 25 #include <linux/compiler.h> 26 27 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT) 28 #include <asm/armv7.h> 29 #endif 30 31 DECLARE_GLOBAL_DATA_PTR; 32 33 static struct tag *params; 34 35 static ulong get_sp(void) 36 { 37 ulong ret; 38 39 asm("mov %0, sp" : "=r"(ret) : ); 40 return ret; 41 } 42 43 void arch_lmb_reserve(struct lmb *lmb) 44 { 45 ulong sp; 46 47 /* 48 * Booting a (Linux) kernel image 49 * 50 * Allocate space for command line and board info - the 51 * address should be as high as possible within the reach of 52 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused 53 * memory, which means far enough below the current stack 54 * pointer. 55 */ 56 sp = get_sp(); 57 debug("## Current stack ends at 0x%08lx ", sp); 58 59 /* adjust sp by 4K to be safe */ 60 sp -= 4096; 61 lmb_reserve(lmb, sp, 62 gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp); 63 } 64 65 /** 66 * announce_and_cleanup() - Print message and prepare for kernel boot 67 * 68 * @fake: non-zero to do everything except actually boot 69 */ 70 static void announce_and_cleanup(int fake) 71 { 72 printf("\nStarting kernel ...%s\n\n", fake ? 73 "(fake run for tracing)" : ""); 74 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel"); 75 #ifdef CONFIG_BOOTSTAGE_FDT 76 bootstage_fdt_add_report(); 77 #endif 78 #ifdef CONFIG_BOOTSTAGE_REPORT 79 bootstage_report(); 80 #endif 81 82 #ifdef CONFIG_USB_DEVICE 83 udc_disconnect(); 84 #endif 85 cleanup_before_linux(); 86 } 87 88 static void setup_start_tag (bd_t *bd) 89 { 90 params = (struct tag *)bd->bi_boot_params; 91 92 params->hdr.tag = ATAG_CORE; 93 params->hdr.size = tag_size (tag_core); 94 95 params->u.core.flags = 0; 96 params->u.core.pagesize = 0; 97 params->u.core.rootdev = 0; 98 99 params = tag_next (params); 100 } 101 102 static void setup_memory_tags(bd_t *bd) 103 { 104 int i; 105 106 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { 107 params->hdr.tag = ATAG_MEM; 108 params->hdr.size = tag_size (tag_mem32); 109 110 params->u.mem.start = bd->bi_dram[i].start; 111 params->u.mem.size = bd->bi_dram[i].size; 112 113 params = tag_next (params); 114 } 115 } 116 117 static void setup_commandline_tag(bd_t *bd, char *commandline) 118 { 119 char *p; 120 121 if (!commandline) 122 return; 123 124 /* eat leading white space */ 125 for (p = commandline; *p == ' '; p++); 126 127 /* skip non-existent command lines so the kernel will still 128 * use its default command line. 129 */ 130 if (*p == '\0') 131 return; 132 133 params->hdr.tag = ATAG_CMDLINE; 134 params->hdr.size = 135 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2; 136 137 strcpy (params->u.cmdline.cmdline, p); 138 139 params = tag_next (params); 140 } 141 142 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end) 143 { 144 /* an ATAG_INITRD node tells the kernel where the compressed 145 * ramdisk can be found. ATAG_RDIMG is a better name, actually. 146 */ 147 params->hdr.tag = ATAG_INITRD2; 148 params->hdr.size = tag_size (tag_initrd); 149 150 params->u.initrd.start = initrd_start; 151 params->u.initrd.size = initrd_end - initrd_start; 152 153 params = tag_next (params); 154 } 155 156 static void setup_serial_tag(struct tag **tmp) 157 { 158 struct tag *params = *tmp; 159 struct tag_serialnr serialnr; 160 161 get_board_serial(&serialnr); 162 params->hdr.tag = ATAG_SERIAL; 163 params->hdr.size = tag_size (tag_serialnr); 164 params->u.serialnr.low = serialnr.low; 165 params->u.serialnr.high= serialnr.high; 166 params = tag_next (params); 167 *tmp = params; 168 } 169 170 static void setup_revision_tag(struct tag **in_params) 171 { 172 u32 rev = 0; 173 174 rev = get_board_rev(); 175 params->hdr.tag = ATAG_REVISION; 176 params->hdr.size = tag_size (tag_revision); 177 params->u.revision.rev = rev; 178 params = tag_next (params); 179 } 180 181 static void setup_end_tag(bd_t *bd) 182 { 183 params->hdr.tag = ATAG_NONE; 184 params->hdr.size = 0; 185 } 186 187 __weak void setup_board_tags(struct tag **in_params) {} 188 189 #ifdef CONFIG_ARM64 190 static void do_nonsec_virt_switch(void) 191 { 192 smp_kick_all_cpus(); 193 flush_dcache_all(); /* flush cache before swtiching to EL2 */ 194 armv8_switch_to_el2(); 195 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1 196 armv8_switch_to_el1(); 197 #endif 198 } 199 #endif 200 201 /* Subcommand: PREP */ 202 static void boot_prep_linux(bootm_headers_t *images) 203 { 204 char *commandline = getenv("bootargs"); 205 206 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { 207 #ifdef CONFIG_OF_LIBFDT 208 debug("using: FDT\n"); 209 if (image_setup_linux(images)) { 210 printf("FDT creation failed! hanging..."); 211 hang(); 212 } 213 #endif 214 } else if (BOOTM_ENABLE_TAGS) { 215 debug("using: ATAGS\n"); 216 setup_start_tag(gd->bd); 217 if (BOOTM_ENABLE_SERIAL_TAG) 218 setup_serial_tag(¶ms); 219 if (BOOTM_ENABLE_CMDLINE_TAG) 220 setup_commandline_tag(gd->bd, commandline); 221 if (BOOTM_ENABLE_REVISION_TAG) 222 setup_revision_tag(¶ms); 223 if (BOOTM_ENABLE_MEMORY_TAGS) 224 setup_memory_tags(gd->bd); 225 if (BOOTM_ENABLE_INITRD_TAG) { 226 if (images->rd_start && images->rd_end) { 227 setup_initrd_tag(gd->bd, images->rd_start, 228 images->rd_end); 229 } 230 } 231 setup_board_tags(¶ms); 232 setup_end_tag(gd->bd); 233 } else { 234 printf("FDT and ATAGS support not compiled in - hanging\n"); 235 hang(); 236 } 237 } 238 239 /* Subcommand: GO */ 240 static void boot_jump_linux(bootm_headers_t *images, int flag) 241 { 242 #ifdef CONFIG_ARM64 243 void (*kernel_entry)(void *fdt_addr, void *res0, void *res1, 244 void *res2); 245 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 246 247 kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1, 248 void *res2))images->ep; 249 250 debug("## Transferring control to Linux (at address %lx)...\n", 251 (ulong) kernel_entry); 252 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 253 254 announce_and_cleanup(fake); 255 256 if (!fake) { 257 do_nonsec_virt_switch(); 258 kernel_entry(images->ft_addr, NULL, NULL, NULL); 259 } 260 #else 261 unsigned long machid = gd->bd->bi_arch_number; 262 char *s; 263 void (*kernel_entry)(int zero, int arch, uint params); 264 unsigned long r2; 265 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 266 267 kernel_entry = (void (*)(int, int, uint))images->ep; 268 269 s = getenv("machid"); 270 if (s) { 271 strict_strtoul(s, 16, &machid); 272 printf("Using machid 0x%lx from environment\n", machid); 273 } 274 275 debug("## Transferring control to Linux (at address %08lx)" \ 276 "...\n", (ulong) kernel_entry); 277 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 278 announce_and_cleanup(fake); 279 280 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) 281 r2 = (unsigned long)images->ft_addr; 282 else 283 r2 = gd->bd->bi_boot_params; 284 285 if (!fake) { 286 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT) 287 armv7_init_nonsec(); 288 secure_ram_addr(_do_nonsec_entry)(kernel_entry, 289 0, machid, r2); 290 #else 291 kernel_entry(0, machid, r2); 292 #endif 293 } 294 #endif 295 } 296 297 /* Main Entry point for arm bootm implementation 298 * 299 * Modeled after the powerpc implementation 300 * DIFFERENCE: Instead of calling prep and go at the end 301 * they are called if subcommand is equal 0. 302 */ 303 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) 304 { 305 /* No need for those on ARM */ 306 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE) 307 return -1; 308 309 if (flag & BOOTM_STATE_OS_PREP) { 310 boot_prep_linux(images); 311 return 0; 312 } 313 314 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { 315 boot_jump_linux(images, flag); 316 return 0; 317 } 318 319 boot_prep_linux(images); 320 boot_jump_linux(images, flag); 321 return 0; 322 } 323 324 #ifdef CONFIG_CMD_BOOTZ 325 326 struct zimage_header { 327 uint32_t code[9]; 328 uint32_t zi_magic; 329 uint32_t zi_start; 330 uint32_t zi_end; 331 }; 332 333 #define LINUX_ARM_ZIMAGE_MAGIC 0x016f2818 334 335 int bootz_setup(ulong image, ulong *start, ulong *end) 336 { 337 struct zimage_header *zi; 338 339 zi = (struct zimage_header *)map_sysmem(image, 0); 340 if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) { 341 puts("Bad Linux ARM zImage magic!\n"); 342 return 1; 343 } 344 345 *start = zi->zi_start; 346 *end = zi->zi_end; 347 348 printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n", image, *start, 349 *end); 350 351 return 0; 352 } 353 354 #endif /* CONFIG_CMD_BOOTZ */ 355 356 #if defined(CONFIG_BOOTM_VXWORKS) 357 void boot_prep_vxworks(bootm_headers_t *images) 358 { 359 #if defined(CONFIG_OF_LIBFDT) 360 int off; 361 362 if (images->ft_addr) { 363 off = fdt_path_offset(images->ft_addr, "/memory"); 364 if (off < 0) { 365 if (arch_fixup_fdt(images->ft_addr)) 366 puts("## WARNING: fixup memory failed!\n"); 367 } 368 } 369 #endif 370 cleanup_before_linux(); 371 } 372 void boot_jump_vxworks(bootm_headers_t *images) 373 { 374 /* ARM VxWorks requires device tree physical address to be passed */ 375 ((void (*)(void *))images->ep)(images->ft_addr); 376 } 377 #endif 378