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 <linux/compiler.h> 24 25 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT) 26 #include <asm/armv7.h> 27 #endif 28 29 DECLARE_GLOBAL_DATA_PTR; 30 31 static struct tag *params; 32 33 static ulong get_sp(void) 34 { 35 ulong ret; 36 37 asm("mov %0, sp" : "=r"(ret) : ); 38 return ret; 39 } 40 41 void arch_lmb_reserve(struct lmb *lmb) 42 { 43 ulong sp; 44 45 /* 46 * Booting a (Linux) kernel image 47 * 48 * Allocate space for command line and board info - the 49 * address should be as high as possible within the reach of 50 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused 51 * memory, which means far enough below the current stack 52 * pointer. 53 */ 54 sp = get_sp(); 55 debug("## Current stack ends at 0x%08lx ", sp); 56 57 /* adjust sp by 4K to be safe */ 58 sp -= 4096; 59 lmb_reserve(lmb, sp, 60 gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp); 61 } 62 63 /** 64 * announce_and_cleanup() - Print message and prepare for kernel boot 65 * 66 * @fake: non-zero to do everything except actually boot 67 */ 68 static void announce_and_cleanup(int fake) 69 { 70 printf("\nStarting kernel ...%s\n\n", fake ? 71 "(fake run for tracing)" : ""); 72 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel"); 73 #ifdef CONFIG_BOOTSTAGE_FDT 74 if (flag == BOOTM_STATE_OS_FAKE_GO) 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 static void do_nonsec_virt_switch(void) 189 { 190 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT) 191 if (armv7_switch_nonsec() == 0) 192 #ifdef CONFIG_ARMV7_VIRT 193 if (armv7_switch_hyp() == 0) 194 debug("entered HYP mode\n"); 195 #else 196 debug("entered non-secure state\n"); 197 #endif 198 #endif 199 200 #ifdef CONFIG_ARM64 201 smp_kick_all_cpus(); 202 flush_dcache_all(); /* 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 #endif 208 } 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 if (images->rd_start && images->rd_end) { 236 setup_initrd_tag(gd->bd, images->rd_start, 237 images->rd_end); 238 } 239 } 240 setup_board_tags(¶ms); 241 setup_end_tag(gd->bd); 242 } else { 243 printf("FDT and ATAGS support not compiled in - hanging\n"); 244 hang(); 245 } 246 do_nonsec_virt_switch(); 247 } 248 249 /* Subcommand: GO */ 250 static void boot_jump_linux(bootm_headers_t *images, int flag) 251 { 252 #ifdef CONFIG_ARM64 253 void (*kernel_entry)(void *fdt_addr); 254 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 255 256 kernel_entry = (void (*)(void *fdt_addr))images->ep; 257 258 debug("## Transferring control to Linux (at address %lx)...\n", 259 (ulong) kernel_entry); 260 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 261 262 announce_and_cleanup(fake); 263 264 if (!fake) 265 kernel_entry(images->ft_addr); 266 #else 267 unsigned long machid = gd->bd->bi_arch_number; 268 char *s; 269 void (*kernel_entry)(int zero, int arch, uint params); 270 unsigned long r2; 271 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 272 273 kernel_entry = (void (*)(int, int, uint))images->ep; 274 275 s = getenv("machid"); 276 if (s) { 277 strict_strtoul(s, 16, &machid); 278 printf("Using machid 0x%lx from environment\n", machid); 279 } 280 281 debug("## Transferring control to Linux (at address %08lx)" \ 282 "...\n", (ulong) kernel_entry); 283 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 284 announce_and_cleanup(fake); 285 286 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) 287 r2 = (unsigned long)images->ft_addr; 288 else 289 r2 = gd->bd->bi_boot_params; 290 291 if (!fake) 292 kernel_entry(0, machid, r2); 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_memory_node(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