arch/arm/lib/bootm.c

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