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 bootstage_fdt_add_report(); 75 #endif 76 #ifdef CONFIG_BOOTSTAGE_REPORT 77 bootstage_report(); 78 #endif 79 80 #ifdef CONFIG_USB_DEVICE 81 udc_disconnect(); 82 #endif 83 cleanup_before_linux(); 84 } 85 86 static void setup_start_tag (bd_t *bd) 87 { 88 params = (struct tag *)bd->bi_boot_params; 89 90 params->hdr.tag = ATAG_CORE; 91 params->hdr.size = tag_size (tag_core); 92 93 params->u.core.flags = 0; 94 params->u.core.pagesize = 0; 95 params->u.core.rootdev = 0; 96 97 params = tag_next (params); 98 } 99 100 static void setup_memory_tags(bd_t *bd) 101 { 102 int i; 103 104 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { 105 params->hdr.tag = ATAG_MEM; 106 params->hdr.size = tag_size (tag_mem32); 107 108 params->u.mem.start = bd->bi_dram[i].start; 109 params->u.mem.size = bd->bi_dram[i].size; 110 111 params = tag_next (params); 112 } 113 } 114 115 static void setup_commandline_tag(bd_t *bd, char *commandline) 116 { 117 char *p; 118 119 if (!commandline) 120 return; 121 122 /* eat leading white space */ 123 for (p = commandline; *p == ' '; p++); 124 125 /* skip non-existent command lines so the kernel will still 126 * use its default command line. 127 */ 128 if (*p == '\0') 129 return; 130 131 params->hdr.tag = ATAG_CMDLINE; 132 params->hdr.size = 133 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2; 134 135 strcpy (params->u.cmdline.cmdline, p); 136 137 params = tag_next (params); 138 } 139 140 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end) 141 { 142 /* an ATAG_INITRD node tells the kernel where the compressed 143 * ramdisk can be found. ATAG_RDIMG is a better name, actually. 144 */ 145 params->hdr.tag = ATAG_INITRD2; 146 params->hdr.size = tag_size (tag_initrd); 147 148 params->u.initrd.start = initrd_start; 149 params->u.initrd.size = initrd_end - initrd_start; 150 151 params = tag_next (params); 152 } 153 154 static void setup_serial_tag(struct tag **tmp) 155 { 156 struct tag *params = *tmp; 157 struct tag_serialnr serialnr; 158 159 get_board_serial(&serialnr); 160 params->hdr.tag = ATAG_SERIAL; 161 params->hdr.size = tag_size (tag_serialnr); 162 params->u.serialnr.low = serialnr.low; 163 params->u.serialnr.high= serialnr.high; 164 params = tag_next (params); 165 *tmp = params; 166 } 167 168 static void setup_revision_tag(struct tag **in_params) 169 { 170 u32 rev = 0; 171 172 rev = get_board_rev(); 173 params->hdr.tag = ATAG_REVISION; 174 params->hdr.size = tag_size (tag_revision); 175 params->u.revision.rev = rev; 176 params = tag_next (params); 177 } 178 179 static void setup_end_tag(bd_t *bd) 180 { 181 params->hdr.tag = ATAG_NONE; 182 params->hdr.size = 0; 183 } 184 185 __weak void setup_board_tags(struct tag **in_params) {} 186 187 static void do_nonsec_virt_switch(void) 188 { 189 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT) 190 if (armv7_switch_nonsec() == 0) 191 #ifdef CONFIG_ARMV7_VIRT 192 if (armv7_switch_hyp() == 0) 193 debug("entered HYP mode\n"); 194 #else 195 debug("entered non-secure state\n"); 196 #endif 197 #endif 198 199 #ifdef CONFIG_ARM64 200 smp_kick_all_cpus(); 201 flush_dcache_all(); /* flush cache before swtiching to EL2 */ 202 armv8_switch_to_el2(); 203 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1 204 armv8_switch_to_el1(); 205 #endif 206 #endif 207 } 208 209 /* Subcommand: PREP */ 210 static void boot_prep_linux(bootm_headers_t *images) 211 { 212 char *commandline = getenv("bootargs"); 213 214 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { 215 #ifdef CONFIG_OF_LIBFDT 216 debug("using: FDT\n"); 217 if (image_setup_linux(images)) { 218 printf("FDT creation failed! hanging..."); 219 hang(); 220 } 221 #endif 222 } else if (BOOTM_ENABLE_TAGS) { 223 debug("using: ATAGS\n"); 224 setup_start_tag(gd->bd); 225 if (BOOTM_ENABLE_SERIAL_TAG) 226 setup_serial_tag(¶ms); 227 if (BOOTM_ENABLE_CMDLINE_TAG) 228 setup_commandline_tag(gd->bd, commandline); 229 if (BOOTM_ENABLE_REVISION_TAG) 230 setup_revision_tag(¶ms); 231 if (BOOTM_ENABLE_MEMORY_TAGS) 232 setup_memory_tags(gd->bd); 233 if (BOOTM_ENABLE_INITRD_TAG) { 234 if (images->rd_start && images->rd_end) { 235 setup_initrd_tag(gd->bd, images->rd_start, 236 images->rd_end); 237 } 238 } 239 setup_board_tags(¶ms); 240 setup_end_tag(gd->bd); 241 } else { 242 printf("FDT and ATAGS support not compiled in - hanging\n"); 243 hang(); 244 } 245 do_nonsec_virt_switch(); 246 } 247 248 /* Subcommand: GO */ 249 static void boot_jump_linux(bootm_headers_t *images, int flag) 250 { 251 #ifdef CONFIG_ARM64 252 void (*kernel_entry)(void *fdt_addr); 253 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 254 255 kernel_entry = (void (*)(void *fdt_addr))images->ep; 256 257 debug("## Transferring control to Linux (at address %lx)...\n", 258 (ulong) kernel_entry); 259 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 260 261 announce_and_cleanup(fake); 262 263 if (!fake) 264 kernel_entry(images->ft_addr); 265 #else 266 unsigned long machid = gd->bd->bi_arch_number; 267 char *s; 268 void (*kernel_entry)(int zero, int arch, uint params); 269 unsigned long r2; 270 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 271 272 kernel_entry = (void (*)(int, int, uint))images->ep; 273 274 s = getenv("machid"); 275 if (s) { 276 strict_strtoul(s, 16, &machid); 277 printf("Using machid 0x%lx from environment\n", machid); 278 } 279 280 debug("## Transferring control to Linux (at address %08lx)" \ 281 "...\n", (ulong) kernel_entry); 282 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 283 announce_and_cleanup(fake); 284 285 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) 286 r2 = (unsigned long)images->ft_addr; 287 else 288 r2 = gd->bd->bi_boot_params; 289 290 if (!fake) 291 kernel_entry(0, machid, r2); 292 #endif 293 } 294 295 /* Main Entry point for arm bootm implementation 296 * 297 * Modeled after the powerpc implementation 298 * DIFFERENCE: Instead of calling prep and go at the end 299 * they are called if subcommand is equal 0. 300 */ 301 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) 302 { 303 /* No need for those on ARM */ 304 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE) 305 return -1; 306 307 if (flag & BOOTM_STATE_OS_PREP) { 308 boot_prep_linux(images); 309 return 0; 310 } 311 312 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { 313 boot_jump_linux(images, flag); 314 return 0; 315 } 316 317 boot_prep_linux(images); 318 boot_jump_linux(images, flag); 319 return 0; 320 } 321 322 #ifdef CONFIG_CMD_BOOTZ 323 324 struct zimage_header { 325 uint32_t code[9]; 326 uint32_t zi_magic; 327 uint32_t zi_start; 328 uint32_t zi_end; 329 }; 330 331 #define LINUX_ARM_ZIMAGE_MAGIC 0x016f2818 332 333 int bootz_setup(ulong image, ulong *start, ulong *end) 334 { 335 struct zimage_header *zi; 336 337 zi = (struct zimage_header *)map_sysmem(image, 0); 338 if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) { 339 puts("Bad Linux ARM zImage magic!\n"); 340 return 1; 341 } 342 343 *start = zi->zi_start; 344 *end = zi->zi_end; 345 346 printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n", image, *start, 347 *end); 348 349 return 0; 350 } 351 352 #endif /* CONFIG_CMD_BOOTZ */ 353 354 #if defined(CONFIG_BOOTM_VXWORKS) 355 void boot_prep_vxworks(bootm_headers_t *images) 356 { 357 #if defined(CONFIG_OF_LIBFDT) 358 int off; 359 360 if (images->ft_addr) { 361 off = fdt_path_offset(images->ft_addr, "/memory"); 362 if (off < 0) { 363 if (arch_fixup_memory_node(images->ft_addr)) 364 puts("## WARNING: fixup memory failed!\n"); 365 } 366 } 367 #endif 368 cleanup_before_linux(); 369 } 370 void boot_jump_vxworks(bootm_headers_t *images) 371 { 372 /* ARM VxWorks requires device tree physical address to be passed */ 373 ((void (*)(void *))images->ep)(images->ft_addr); 374 } 375 #endif 376