git.sur5r.net Git - u-boot/blob - arch/arm/lib/bootm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Copyright (C) 2011
   3  * Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
   4  *  - Added prep subcommand support
   5  *  - Reorganized source - modeled after powerpc version
   6  *
   7  * (C) Copyright 2002
   8  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   9  * Marius Groeger <mgroeger@sysgo.de>
  10  *
  11  * Copyright (C) 2001  Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
  12  */
  13
  14 #include <common.h>
  15 #include <command.h>
  16 #include <dm.h>
  17 #include <dm/root.h>
  18 #include <image.h>
  19 #include <u-boot/zlib.h>
  20 #include <asm/byteorder.h>
  21 #include <linux/libfdt.h>
  22 #include <mapmem.h>
  23 #include <fdt_support.h>
  24 #include <asm/bootm.h>
  25 #include <asm/secure.h>
  26 #include <linux/compiler.h>
  27 #include <bootm.h>
  28 #include <vxworks.h>
  29
  30 #ifdef CONFIG_ARMV7_NONSEC
  31 #include <asm/armv7.h>
  32 #endif
  33 #include <asm/setup.h>
  34
  35 DECLARE_GLOBAL_DATA_PTR;
  36
  37 static struct tag *params;
  38
  39 static ulong get_sp(void)
  40 {
  41         ulong ret;
  42
  43         asm("mov %0, sp" : "=r"(ret) : );
  44         return ret;
  45 }
  46
  47 void arch_lmb_reserve(struct lmb *lmb)
  48 {
  49         ulong sp, bank_end;
  50         int bank;
  51
  52         /*
  53          * Booting a (Linux) kernel image
  54          *
  55          * Allocate space for command line and board info - the
  56          * address should be as high as possible within the reach of
  57          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  58          * memory, which means far enough below the current stack
  59          * pointer.
  60          */
  61         sp = get_sp();
  62         debug("## Current stack ends at 0x%08lx ", sp);
  63
  64         /* adjust sp by 4K to be safe */
  65         sp -= 4096;
  66         for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
  67                 if (sp < gd->bd->bi_dram[bank].start)
  68                         continue;
  69                 bank_end = gd->bd->bi_dram[bank].start +
  70                         gd->bd->bi_dram[bank].size;
  71                 if (sp >= bank_end)
  72                         continue;
  73                 lmb_reserve(lmb, sp, bank_end - sp);
  74                 break;
  75         }
  76 }
  77
  78 __weak void board_quiesce_devices(void)
  79 {
  80 }
  81
  82 /**
  83  * announce_and_cleanup() - Print message and prepare for kernel boot
  84  *
  85  * @fake: non-zero to do everything except actually boot
  86  */
  87 static void announce_and_cleanup(int fake)
  88 {
  89         printf("\nStarting kernel ...%s\n\n", fake ?
  90                 "(fake run for tracing)" : "");
  91         bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  92 #ifdef CONFIG_BOOTSTAGE_FDT
  93         bootstage_fdt_add_report();
  94 #endif
  95 #ifdef CONFIG_BOOTSTAGE_REPORT
  96         bootstage_report();
  97 #endif
  98
  99 #ifdef CONFIG_USB_DEVICE
 100         udc_disconnect();
 101 #endif
 102
 103         board_quiesce_devices();
 104
 105         /*
 106          * Call remove function of all devices with a removal flag set.
 107          * This may be useful for last-stage operations, like cancelling
 108          * of DMA operation or releasing device internal buffers.
 109          */
 110         dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
 111
 112         cleanup_before_linux();
 113 }
 114
 115 static void setup_start_tag (bd_t *bd)
 116 {
 117         params = (struct tag *)bd->bi_boot_params;
 118
 119         params->hdr.tag = ATAG_CORE;
 120         params->hdr.size = tag_size (tag_core);
 121
 122         params->u.core.flags = 0;
 123         params->u.core.pagesize = 0;
 124         params->u.core.rootdev = 0;
 125
 126         params = tag_next (params);
 127 }
 128
 129 static void setup_memory_tags(bd_t *bd)
 130 {
 131         int i;
 132
 133         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 134                 params->hdr.tag = ATAG_MEM;
 135                 params->hdr.size = tag_size (tag_mem32);
 136
 137                 params->u.mem.start = bd->bi_dram[i].start;
 138                 params->u.mem.size = bd->bi_dram[i].size;
 139
 140                 params = tag_next (params);
 141         }
 142 }
 143
 144 static void setup_commandline_tag(bd_t *bd, char *commandline)
 145 {
 146         char *p;
 147
 148         if (!commandline)
 149                 return;
 150
 151         /* eat leading white space */
 152         for (p = commandline; *p == ' '; p++);
 153
 154         /* skip non-existent command lines so the kernel will still
 155          * use its default command line.
 156          */
 157         if (*p == '\0')
 158                 return;
 159
 160         params->hdr.tag = ATAG_CMDLINE;
 161         params->hdr.size =
 162                 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
 163
 164         strcpy (params->u.cmdline.cmdline, p);
 165
 166         params = tag_next (params);
 167 }
 168
 169 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
 170 {
 171         /* an ATAG_INITRD node tells the kernel where the compressed
 172          * ramdisk can be found. ATAG_RDIMG is a better name, actually.
 173          */
 174         params->hdr.tag = ATAG_INITRD2;
 175         params->hdr.size = tag_size (tag_initrd);
 176
 177         params->u.initrd.start = initrd_start;
 178         params->u.initrd.size = initrd_end - initrd_start;
 179
 180         params = tag_next (params);
 181 }
 182
 183 static void setup_serial_tag(struct tag **tmp)
 184 {
 185         struct tag *params = *tmp;
 186         struct tag_serialnr serialnr;
 187
 188         get_board_serial(&serialnr);
 189         params->hdr.tag = ATAG_SERIAL;
 190         params->hdr.size = tag_size (tag_serialnr);
 191         params->u.serialnr.low = serialnr.low;
 192         params->u.serialnr.high= serialnr.high;
 193         params = tag_next (params);
 194         *tmp = params;
 195 }
 196
 197 static void setup_revision_tag(struct tag **in_params)
 198 {
 199         u32 rev = 0;
 200
 201         rev = get_board_rev();
 202         params->hdr.tag = ATAG_REVISION;
 203         params->hdr.size = tag_size (tag_revision);
 204         params->u.revision.rev = rev;
 205         params = tag_next (params);
 206 }
 207
 208 static void setup_end_tag(bd_t *bd)
 209 {
 210         params->hdr.tag = ATAG_NONE;
 211         params->hdr.size = 0;
 212 }
 213
 214 __weak void setup_board_tags(struct tag **in_params) {}
 215
 216 #ifdef CONFIG_ARM64
 217 static void do_nonsec_virt_switch(void)
 218 {
 219         smp_kick_all_cpus();
 220         dcache_disable();       /* flush cache before swtiching to EL2 */
 221 }
 222 #endif
 223
 224 /* Subcommand: PREP */
 225 static void boot_prep_linux(bootm_headers_t *images)
 226 {
 227         char *commandline = env_get("bootargs");
 228
 229         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
 230 #ifdef CONFIG_OF_LIBFDT
 231                 debug("using: FDT\n");
 232                 if (image_setup_linux(images)) {
 233                         printf("FDT creation failed! hanging...");
 234                         hang();
 235                 }
 236 #endif
 237         } else if (BOOTM_ENABLE_TAGS) {
 238                 debug("using: ATAGS\n");
 239                 setup_start_tag(gd->bd);
 240                 if (BOOTM_ENABLE_SERIAL_TAG)
 241                         setup_serial_tag(&params);
 242                 if (BOOTM_ENABLE_CMDLINE_TAG)
 243                         setup_commandline_tag(gd->bd, commandline);
 244                 if (BOOTM_ENABLE_REVISION_TAG)
 245                         setup_revision_tag(&params);
 246                 if (BOOTM_ENABLE_MEMORY_TAGS)
 247                         setup_memory_tags(gd->bd);
 248                 if (BOOTM_ENABLE_INITRD_TAG) {
 249                         /*
 250                          * In boot_ramdisk_high(), it may relocate ramdisk to
 251                          * a specified location. And set images->initrd_start &
 252                          * images->initrd_end to relocated ramdisk's start/end
 253                          * addresses. So use them instead of images->rd_start &
 254                          * images->rd_end when possible.
 255                          */
 256                         if (images->initrd_start && images->initrd_end) {
 257                                 setup_initrd_tag(gd->bd, images->initrd_start,
 258                                                  images->initrd_end);
 259                         } else if (images->rd_start && images->rd_end) {
 260                                 setup_initrd_tag(gd->bd, images->rd_start,
 261                                                  images->rd_end);
 262                         }
 263                 }
 264                 setup_board_tags(&params);
 265                 setup_end_tag(gd->bd);
 266         } else {
 267                 printf("FDT and ATAGS support not compiled in - hanging\n");
 268                 hang();
 269         }
 270 }
 271
 272 __weak bool armv7_boot_nonsec_default(void)
 273 {
 274 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
 275         return false;
 276 #else
 277         return true;
 278 #endif
 279 }
 280
 281 #ifdef CONFIG_ARMV7_NONSEC
 282 bool armv7_boot_nonsec(void)
 283 {
 284         char *s = env_get("bootm_boot_mode");
 285         bool nonsec = armv7_boot_nonsec_default();
 286
 287         if (s && !strcmp(s, "sec"))
 288                 nonsec = false;
 289
 290         if (s && !strcmp(s, "nonsec"))
 291                 nonsec = true;
 292
 293         return nonsec;
 294 }
 295 #endif
 296
 297 #ifdef CONFIG_ARM64
 298 __weak void update_os_arch_secondary_cores(uint8_t os_arch)
 299 {
 300 }
 301
 302 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
 303 static void switch_to_el1(void)
 304 {
 305         if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
 306             (images.os.arch == IH_ARCH_ARM))
 307                 armv8_switch_to_el1(0, (u64)gd->bd->bi_arch_number,
 308                                     (u64)images.ft_addr, 0,
 309                                     (u64)images.ep,
 310                                     ES_TO_AARCH32);
 311         else
 312                 armv8_switch_to_el1((u64)images.ft_addr, 0, 0, 0,
 313                                     images.ep,
 314                                     ES_TO_AARCH64);
 315 }
 316 #endif
 317 #endif
 318
 319 /* Subcommand: GO */
 320 static void boot_jump_linux(bootm_headers_t *images, int flag)
 321 {
 322 #ifdef CONFIG_ARM64
 323         void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
 324                         void *res2);
 325         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 326
 327         kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
 328                                 void *res2))images->ep;
 329
 330         debug("## Transferring control to Linux (at address %lx)...\n",
 331                 (ulong) kernel_entry);
 332         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 333
 334         announce_and_cleanup(fake);
 335
 336         if (!fake) {
 337 #ifdef CONFIG_ARMV8_PSCI
 338                 armv8_setup_psci();
 339 #endif
 340                 do_nonsec_virt_switch();
 341
 342                 update_os_arch_secondary_cores(images->os.arch);
 343
 344 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
 345                 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
 346                                     (u64)switch_to_el1, ES_TO_AARCH64);
 347 #else
 348                 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
 349                     (images->os.arch == IH_ARCH_ARM))
 350                         armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number,
 351                                             (u64)images->ft_addr, 0,
 352                                             (u64)images->ep,
 353                                             ES_TO_AARCH32);
 354                 else
 355                         armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
 356                                             images->ep,
 357                                             ES_TO_AARCH64);
 358 #endif
 359         }
 360 #else
 361         unsigned long machid = gd->bd->bi_arch_number;
 362         char *s;
 363         void (*kernel_entry)(int zero, int arch, uint params);
 364         unsigned long r2;
 365         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 366
 367         kernel_entry = (void (*)(int, int, uint))images->ep;
 368 #ifdef CONFIG_CPU_V7M
 369         ulong addr = (ulong)kernel_entry | 1;
 370         kernel_entry = (void *)addr;
 371 #endif
 372         s = env_get("machid");
 373         if (s) {
 374                 if (strict_strtoul(s, 16, &machid) < 0) {
 375                         debug("strict_strtoul failed!\n");
 376                         return;
 377                 }
 378                 printf("Using machid 0x%lx from environment\n", machid);
 379         }
 380
 381         debug("## Transferring control to Linux (at address %08lx)" \
 382                 "...\n", (ulong) kernel_entry);
 383         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 384         announce_and_cleanup(fake);
 385
 386         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
 387                 r2 = (unsigned long)images->ft_addr;
 388         else
 389                 r2 = gd->bd->bi_boot_params;
 390
 391         if (!fake) {
 392 #ifdef CONFIG_ARMV7_NONSEC
 393                 if (armv7_boot_nonsec()) {
 394                         armv7_init_nonsec();
 395                         secure_ram_addr(_do_nonsec_entry)(kernel_entry,
 396                                                           0, machid, r2);
 397                 } else
 398 #endif
 399                         kernel_entry(0, machid, r2);
 400         }
 401 #endif
 402 }
 403
 404 /* Main Entry point for arm bootm implementation
 405  *
 406  * Modeled after the powerpc implementation
 407  * DIFFERENCE: Instead of calling prep and go at the end
 408  * they are called if subcommand is equal 0.
 409  */
 410 int do_bootm_linux(int flag, int argc, char * const argv[],
 411                    bootm_headers_t *images)
 412 {
 413         /* No need for those on ARM */
 414         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
 415                 return -1;
 416
 417         if (flag & BOOTM_STATE_OS_PREP) {
 418                 boot_prep_linux(images);
 419                 return 0;
 420         }
 421
 422         if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
 423                 boot_jump_linux(images, flag);
 424                 return 0;
 425         }
 426
 427         boot_prep_linux(images);
 428         boot_jump_linux(images, flag);
 429         return 0;
 430 }
 431
 432 #if defined(CONFIG_BOOTM_VXWORKS)
 433 void boot_prep_vxworks(bootm_headers_t *images)
 434 {
 435 #if defined(CONFIG_OF_LIBFDT)
 436         int off;
 437
 438         if (images->ft_addr) {
 439                 off = fdt_path_offset(images->ft_addr, "/memory");
 440                 if (off < 0) {
 441                         if (arch_fixup_fdt(images->ft_addr))
 442                                 puts("## WARNING: fixup memory failed!\n");
 443                 }
 444         }
 445 #endif
 446         cleanup_before_linux();
 447 }
 448 void boot_jump_vxworks(bootm_headers_t *images)
 449 {
 450 #if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI)
 451         armv8_setup_psci();
 452         smp_kick_all_cpus();
 453 #endif
 454
 455         /* ARM VxWorks requires device tree physical address to be passed */
 456         ((void (*)(void *))images->ep)(images->ft_addr);
 457 }
 458 #endif