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