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 <bootm.h>
  15 #include <bootstage.h>
  16 #include <command.h>
  17 #include <cpu_func.h>
  18 #include <dm.h>
  19 #include <log.h>
  20 #include <asm/global_data.h>
  21 #include <dm/root.h>
  22 #include <env.h>
  23 #include <image.h>
  24 #include <u-boot/zlib.h>
  25 #include <asm/byteorder.h>
  26 #include <linux/libfdt.h>
  27 #include <mapmem.h>
  28 #include <fdt_support.h>
  29 #include <asm/bootm.h>
  30 #include <asm/secure.h>
  31 #include <linux/compiler.h>
  32 #include <bootm.h>
  33 #include <vxworks.h>
  34 #include <asm/cache.h>
  35
  36 #ifdef CONFIG_ARMV7_NONSEC
  37 #include <asm/armv7.h>
  38 #endif
  39 #include <asm/setup.h>
  40
  41 DECLARE_GLOBAL_DATA_PTR;
  42
  43 static struct tag *params;
  44
  45 __weak void board_quiesce_devices(void)
  46 {
  47 }
  48
  49 /**
  50  * announce_and_cleanup() - Print message and prepare for kernel boot
  51  *
  52  * @fake: non-zero to do everything except actually boot
  53  */
  54 static void announce_and_cleanup(int fake)
  55 {
  56         bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  57 #ifdef CONFIG_BOOTSTAGE_FDT
  58         bootstage_fdt_add_report();
  59 #endif
  60 #ifdef CONFIG_BOOTSTAGE_REPORT
  61         bootstage_report();
  62 #endif
  63
  64 #ifdef CONFIG_USB_DEVICE
  65         udc_disconnect();
  66 #endif
  67
  68         board_quiesce_devices();
  69
  70         printf("\nStarting kernel ...%s\n\n", fake ?
  71                 "(fake run for tracing)" : "");
  72         /*
  73          * Call remove function of all devices with a removal flag set.
  74          * This may be useful for last-stage operations, like cancelling
  75          * of DMA operation or releasing device internal buffers.
  76          */
  77         dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL | DM_REMOVE_NON_VITAL);
  78
  79         /* Remove all active vital devices next */
  80         dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
  81
  82         cleanup_before_linux();
  83 }
  84
  85 static void setup_start_tag (struct bd_info *bd)
  86 {
  87         params = (struct tag *)bd->bi_boot_params;
  88
  89         params->hdr.tag = ATAG_CORE;
  90         params->hdr.size = tag_size (tag_core);
  91
  92         params->u.core.flags = 0;
  93         params->u.core.pagesize = 0;
  94         params->u.core.rootdev = 0;
  95
  96         params = tag_next (params);
  97 }
  98
  99 static void setup_memory_tags(struct bd_info *bd)
 100 {
 101         int i;
 102
 103         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 104                 params->hdr.tag = ATAG_MEM;
 105                 params->hdr.size = tag_size (tag_mem32);
 106
 107                 params->u.mem.start = bd->bi_dram[i].start;
 108                 params->u.mem.size = bd->bi_dram[i].size;
 109
 110                 params = tag_next (params);
 111         }
 112 }
 113
 114 static void setup_commandline_tag(struct bd_info *bd, char *commandline)
 115 {
 116         char *p;
 117
 118         if (!commandline)
 119                 return;
 120
 121         /* eat leading white space */
 122         for (p = commandline; *p == ' '; p++);
 123
 124         /* skip non-existent command lines so the kernel will still
 125          * use its default command line.
 126          */
 127         if (*p == '\0')
 128                 return;
 129
 130         params->hdr.tag = ATAG_CMDLINE;
 131         params->hdr.size =
 132                 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
 133
 134         strcpy (params->u.cmdline.cmdline, p);
 135
 136         params = tag_next (params);
 137 }
 138
 139 static void setup_initrd_tag(struct bd_info *bd, ulong initrd_start,
 140                              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(struct bd_info *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 #ifdef CONFIG_ARM64
 188 static void do_nonsec_virt_switch(void)
 189 {
 190         smp_kick_all_cpus();
 191         dcache_disable();       /* flush cache before swtiching to EL2 */
 192 }
 193 #endif
 194
 195 __weak void board_prep_linux(struct bootm_headers *images) { }
 196
 197 /* Subcommand: PREP */
 198 static void boot_prep_linux(struct bootm_headers *images)
 199 {
 200         char *commandline = env_get("bootargs");
 201
 202         if (CONFIG_IS_ENABLED(OF_LIBFDT) && IS_ENABLED(CONFIG_LMB) && images->ft_len) {
 203                 debug("using: FDT\n");
 204                 if (image_setup_linux(images)) {
 205                         panic("FDT creation failed!");
 206                 }
 207         } else if (BOOTM_ENABLE_TAGS) {
 208                 debug("using: ATAGS\n");
 209                 setup_start_tag(gd->bd);
 210                 if (BOOTM_ENABLE_SERIAL_TAG)
 211                         setup_serial_tag(&params);
 212                 if (BOOTM_ENABLE_CMDLINE_TAG)
 213                         setup_commandline_tag(gd->bd, commandline);
 214                 if (BOOTM_ENABLE_REVISION_TAG)
 215                         setup_revision_tag(&params);
 216                 if (BOOTM_ENABLE_MEMORY_TAGS)
 217                         setup_memory_tags(gd->bd);
 218                 if (BOOTM_ENABLE_INITRD_TAG) {
 219                         /*
 220                          * In boot_ramdisk_high(), it may relocate ramdisk to
 221                          * a specified location. And set images->initrd_start &
 222                          * images->initrd_end to relocated ramdisk's start/end
 223                          * addresses. So use them instead of images->rd_start &
 224                          * images->rd_end when possible.
 225                          */
 226                         if (images->initrd_start && images->initrd_end) {
 227                                 setup_initrd_tag(gd->bd, images->initrd_start,
 228                                                  images->initrd_end);
 229                         } else if (images->rd_start && images->rd_end) {
 230                                 setup_initrd_tag(gd->bd, images->rd_start,
 231                                                  images->rd_end);
 232                         }
 233                 }
 234                 setup_board_tags(&params);
 235                 setup_end_tag(gd->bd);
 236         } else {
 237                 panic("FDT and ATAGS support not compiled in\n");
 238         }
 239
 240         board_prep_linux(images);
 241 }
 242
 243 __weak bool armv7_boot_nonsec_default(void)
 244 {
 245 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
 246         return false;
 247 #else
 248         return true;
 249 #endif
 250 }
 251
 252 #ifdef CONFIG_ARMV7_NONSEC
 253 bool armv7_boot_nonsec(void)
 254 {
 255         char *s = env_get("bootm_boot_mode");
 256         bool nonsec = armv7_boot_nonsec_default();
 257
 258         if (s && !strcmp(s, "sec"))
 259                 nonsec = false;
 260
 261         if (s && !strcmp(s, "nonsec"))
 262                 nonsec = true;
 263
 264         return nonsec;
 265 }
 266 #endif
 267
 268 #ifdef CONFIG_ARM64
 269 __weak void update_os_arch_secondary_cores(uint8_t os_arch)
 270 {
 271 }
 272
 273 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
 274 static void switch_to_el1(void)
 275 {
 276         if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
 277             (images.os.arch == IH_ARCH_ARM))
 278                 armv8_switch_to_el1(0, (u64)gd->bd->bi_arch_number,
 279                                     (u64)images.ft_addr, 0,
 280                                     (u64)images.ep,
 281                                     ES_TO_AARCH32);
 282         else
 283                 armv8_switch_to_el1((u64)images.ft_addr, 0, 0, 0,
 284                                     images.ep,
 285                                     ES_TO_AARCH64);
 286 }
 287 #endif
 288 #endif
 289
 290 /* Subcommand: GO */
 291 static void boot_jump_linux(struct bootm_headers *images, int flag)
 292 {
 293 #ifdef CONFIG_ARM64
 294         void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
 295                         void *res2);
 296         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 297
 298         kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
 299                                 void *res2))images->ep;
 300
 301         debug("## Transferring control to Linux (at address %lx)...\n",
 302                 (ulong) kernel_entry);
 303         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 304
 305         announce_and_cleanup(fake);
 306
 307         if (!fake) {
 308 #ifdef CONFIG_ARMV8_PSCI
 309                 armv8_setup_psci();
 310 #endif
 311                 do_nonsec_virt_switch();
 312
 313                 update_os_arch_secondary_cores(images->os.arch);
 314
 315 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
 316                 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
 317                                     (u64)switch_to_el1, ES_TO_AARCH64);
 318 #else
 319                 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
 320                     (images->os.arch == IH_ARCH_ARM))
 321                         armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number,
 322                                             (u64)images->ft_addr, 0,
 323                                             (u64)images->ep,
 324                                             ES_TO_AARCH32);
 325                 else
 326                         armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
 327                                             images->ep,
 328                                             ES_TO_AARCH64);
 329 #endif
 330         }
 331 #else
 332         unsigned long machid = gd->bd->bi_arch_number;
 333         char *s;
 334         void (*kernel_entry)(int zero, int arch, uint params);
 335         unsigned long r2;
 336         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 337
 338         kernel_entry = (void (*)(int, int, uint))images->ep;
 339 #ifdef CONFIG_CPU_V7M
 340         ulong addr = (ulong)kernel_entry | 1;
 341         kernel_entry = (void *)addr;
 342 #endif
 343         s = env_get("machid");
 344         if (s) {
 345                 if (strict_strtoul(s, 16, &machid) < 0) {
 346                         debug("strict_strtoul failed!\n");
 347                         return;
 348                 }
 349                 printf("Using machid 0x%lx from environment\n", machid);
 350         }
 351
 352         debug("## Transferring control to Linux (at address %08lx)" \
 353                 "...\n", (ulong) kernel_entry);
 354         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 355         announce_and_cleanup(fake);
 356
 357         if (CONFIG_IS_ENABLED(OF_LIBFDT) && images->ft_len)
 358                 r2 = (unsigned long)images->ft_addr;
 359         else
 360                 r2 = gd->bd->bi_boot_params;
 361
 362         if (!fake) {
 363 #ifdef CONFIG_ARMV7_NONSEC
 364                 if (armv7_boot_nonsec()) {
 365                         armv7_init_nonsec();
 366                         secure_ram_addr(_do_nonsec_entry)(kernel_entry,
 367                                                           0, machid, r2);
 368                 } else
 369 #endif
 370                         kernel_entry(0, machid, r2);
 371         }
 372 #endif
 373 }
 374
 375 /* Main Entry point for arm bootm implementation
 376  *
 377  * Modeled after the powerpc implementation
 378  * DIFFERENCE: Instead of calling prep and go at the end
 379  * they are called if subcommand is equal 0.
 380  */
 381 int do_bootm_linux(int flag, struct bootm_info *bmi)
 382 {
 383         struct bootm_headers *images = bmi->images;
 384
 385         /* No need for those on ARM */
 386         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
 387                 return -1;
 388
 389         if (flag & BOOTM_STATE_OS_PREP) {
 390                 boot_prep_linux(images);
 391                 return 0;
 392         }
 393
 394         if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
 395                 boot_jump_linux(images, flag);
 396                 return 0;
 397         }
 398
 399         boot_prep_linux(images);
 400         boot_jump_linux(images, flag);
 401         return 0;
 402 }
 403
 404 #if defined(CONFIG_BOOTM_VXWORKS)
 405 void boot_prep_vxworks(struct bootm_headers *images)
 406 {
 407 #if defined(CONFIG_OF_LIBFDT)
 408         int off;
 409
 410         if (images->ft_addr) {
 411                 off = fdt_path_offset(images->ft_addr, "/memory");
 412                 if (off > 0) {
 413                         if (arch_fixup_fdt(images->ft_addr))
 414                                 puts("## WARNING: fixup memory failed!\n");
 415                 }
 416         }
 417 #endif
 418         cleanup_before_linux();
 419 }
 420
 421 void boot_jump_vxworks(struct bootm_headers *images)
 422 {
 423 #if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI)
 424         armv8_setup_psci();
 425         smp_kick_all_cpus();
 426 #endif
 427
 428         /* ARM VxWorks requires device tree physical address to be passed */
 429         ((void (*)(void *))images->ep)(images->ft_addr);
 430 }
 431 #endif