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 <image.h>
  18 #include <u-boot/zlib.h>
  19 #include <asm/byteorder.h>
  20 #include <libfdt.h>
  21 #include <mapmem.h>
  22 #include <fdt_support.h>
  23 #include <asm/bootm.h>
  24 #include <asm/secure.h>
  25 #include <linux/compiler.h>
  26 #include <bootm.h>
  27 #include <vxworks.h>
  28
  29 #ifdef CONFIG_ARMV7_NONSEC
  30 #include <asm/armv7.h>
  31 #endif
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 static struct tag *params;
  36
  37 static ulong get_sp(void)
  38 {
  39         ulong ret;
  40
  41         asm("mov %0, sp" : "=r"(ret) : );
  42         return ret;
  43 }
  44
  45 void arch_lmb_reserve(struct lmb *lmb)
  46 {
  47         ulong sp;
  48
  49         /*
  50          * Booting a (Linux) kernel image
  51          *
  52          * Allocate space for command line and board info - the
  53          * address should be as high as possible within the reach of
  54          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  55          * memory, which means far enough below the current stack
  56          * pointer.
  57          */
  58         sp = get_sp();
  59         debug("## Current stack ends at 0x%08lx ", sp);
  60
  61         /* adjust sp by 4K to be safe */
  62         sp -= 4096;
  63         lmb_reserve(lmb, sp,
  64                     gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
  65 }
  66
  67 __weak void board_quiesce_devices(void)
  68 {
  69 }
  70
  71 /**
  72  * announce_and_cleanup() - Print message and prepare for kernel boot
  73  *
  74  * @fake: non-zero to do everything except actually boot
  75  */
  76 static void announce_and_cleanup(int fake)
  77 {
  78         printf("\nStarting kernel ...%s\n\n", fake ?
  79                 "(fake run for tracing)" : "");
  80         bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  81 #ifdef CONFIG_BOOTSTAGE_FDT
  82         bootstage_fdt_add_report();
  83 #endif
  84 #ifdef CONFIG_BOOTSTAGE_REPORT
  85         bootstage_report();
  86 #endif
  87
  88 #ifdef CONFIG_USB_DEVICE
  89         udc_disconnect();
  90 #endif
  91
  92         board_quiesce_devices();
  93
  94         cleanup_before_linux();
  95 }
  96
  97 static void setup_start_tag (bd_t *bd)
  98 {
  99         params = (struct tag *)bd->bi_boot_params;
 100
 101         params->hdr.tag = ATAG_CORE;
 102         params->hdr.size = tag_size (tag_core);
 103
 104         params->u.core.flags = 0;
 105         params->u.core.pagesize = 0;
 106         params->u.core.rootdev = 0;
 107
 108         params = tag_next (params);
 109 }
 110
 111 static void setup_memory_tags(bd_t *bd)
 112 {
 113         int i;
 114
 115         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 116                 params->hdr.tag = ATAG_MEM;
 117                 params->hdr.size = tag_size (tag_mem32);
 118
 119                 params->u.mem.start = bd->bi_dram[i].start;
 120                 params->u.mem.size = bd->bi_dram[i].size;
 121
 122                 params = tag_next (params);
 123         }
 124 }
 125
 126 static void setup_commandline_tag(bd_t *bd, char *commandline)
 127 {
 128         char *p;
 129
 130         if (!commandline)
 131                 return;
 132
 133         /* eat leading white space */
 134         for (p = commandline; *p == ' '; p++);
 135
 136         /* skip non-existent command lines so the kernel will still
 137          * use its default command line.
 138          */
 139         if (*p == '\0')
 140                 return;
 141
 142         params->hdr.tag = ATAG_CMDLINE;
 143         params->hdr.size =
 144                 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
 145
 146         strcpy (params->u.cmdline.cmdline, p);
 147
 148         params = tag_next (params);
 149 }
 150
 151 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
 152 {
 153         /* an ATAG_INITRD node tells the kernel where the compressed
 154          * ramdisk can be found. ATAG_RDIMG is a better name, actually.
 155          */
 156         params->hdr.tag = ATAG_INITRD2;
 157         params->hdr.size = tag_size (tag_initrd);
 158
 159         params->u.initrd.start = initrd_start;
 160         params->u.initrd.size = initrd_end - initrd_start;
 161
 162         params = tag_next (params);
 163 }
 164
 165 static void setup_serial_tag(struct tag **tmp)
 166 {
 167         struct tag *params = *tmp;
 168         struct tag_serialnr serialnr;
 169
 170         get_board_serial(&serialnr);
 171         params->hdr.tag = ATAG_SERIAL;
 172         params->hdr.size = tag_size (tag_serialnr);
 173         params->u.serialnr.low = serialnr.low;
 174         params->u.serialnr.high= serialnr.high;
 175         params = tag_next (params);
 176         *tmp = params;
 177 }
 178
 179 static void setup_revision_tag(struct tag **in_params)
 180 {
 181         u32 rev = 0;
 182
 183         rev = get_board_rev();
 184         params->hdr.tag = ATAG_REVISION;
 185         params->hdr.size = tag_size (tag_revision);
 186         params->u.revision.rev = rev;
 187         params = tag_next (params);
 188 }
 189
 190 static void setup_end_tag(bd_t *bd)
 191 {
 192         params->hdr.tag = ATAG_NONE;
 193         params->hdr.size = 0;
 194 }
 195
 196 __weak void setup_board_tags(struct tag **in_params) {}
 197
 198 #ifdef CONFIG_ARM64
 199 static void do_nonsec_virt_switch(void)
 200 {
 201         smp_kick_all_cpus();
 202         dcache_disable();       /* 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 }
 208 #endif
 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(&params);
 228                 if (BOOTM_ENABLE_CMDLINE_TAG)
 229                         setup_commandline_tag(gd->bd, commandline);
 230                 if (BOOTM_ENABLE_REVISION_TAG)
 231                         setup_revision_tag(&params);
 232                 if (BOOTM_ENABLE_MEMORY_TAGS)
 233                         setup_memory_tags(gd->bd);
 234                 if (BOOTM_ENABLE_INITRD_TAG) {
 235                         /*
 236                          * In boot_ramdisk_high(), it may relocate ramdisk to
 237                          * a specified location. And set images->initrd_start &
 238                          * images->initrd_end to relocated ramdisk's start/end
 239                          * addresses. So use them instead of images->rd_start &
 240                          * images->rd_end when possible.
 241                          */
 242                         if (images->initrd_start && images->initrd_end) {
 243                                 setup_initrd_tag(gd->bd, images->initrd_start,
 244                                                  images->initrd_end);
 245                         } else if (images->rd_start && images->rd_end) {
 246                                 setup_initrd_tag(gd->bd, images->rd_start,
 247                                                  images->rd_end);
 248                         }
 249                 }
 250                 setup_board_tags(&params);
 251                 setup_end_tag(gd->bd);
 252         } else {
 253                 printf("FDT and ATAGS support not compiled in - hanging\n");
 254                 hang();
 255         }
 256 }
 257
 258 __weak bool armv7_boot_nonsec_default(void)
 259 {
 260 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
 261         return false;
 262 #else
 263         return true;
 264 #endif
 265 }
 266
 267 #ifdef CONFIG_ARMV7_NONSEC
 268 bool armv7_boot_nonsec(void)
 269 {
 270         char *s = getenv("bootm_boot_mode");
 271         bool nonsec = armv7_boot_nonsec_default();
 272
 273         if (s && !strcmp(s, "sec"))
 274                 nonsec = false;
 275
 276         if (s && !strcmp(s, "nonsec"))
 277                 nonsec = true;
 278
 279         return nonsec;
 280 }
 281 #endif
 282
 283 /* Subcommand: GO */
 284 static void boot_jump_linux(bootm_headers_t *images, int flag)
 285 {
 286 #ifdef CONFIG_ARM64
 287         void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
 288                         void *res2);
 289         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 290
 291         kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
 292                                 void *res2))images->ep;
 293
 294         debug("## Transferring control to Linux (at address %lx)...\n",
 295                 (ulong) kernel_entry);
 296         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 297
 298         announce_and_cleanup(fake);
 299
 300         if (!fake) {
 301                 do_nonsec_virt_switch();
 302                 kernel_entry(images->ft_addr, NULL, NULL, NULL);
 303         }
 304 #else
 305         unsigned long machid = gd->bd->bi_arch_number;
 306         char *s;
 307         void (*kernel_entry)(int zero, int arch, uint params);
 308         unsigned long r2;
 309         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 310
 311         kernel_entry = (void (*)(int, int, uint))images->ep;
 312
 313         s = getenv("machid");
 314         if (s) {
 315                 if (strict_strtoul(s, 16, &machid) < 0) {
 316                         debug("strict_strtoul failed!\n");
 317                         return;
 318                 }
 319                 printf("Using machid 0x%lx from environment\n", machid);
 320         }
 321
 322         debug("## Transferring control to Linux (at address %08lx)" \
 323                 "...\n", (ulong) kernel_entry);
 324         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 325         announce_and_cleanup(fake);
 326
 327         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
 328                 r2 = (unsigned long)images->ft_addr;
 329         else
 330                 r2 = gd->bd->bi_boot_params;
 331
 332         if (!fake) {
 333 #ifdef CONFIG_ARMV7_NONSEC
 334                 if (armv7_boot_nonsec()) {
 335                         armv7_init_nonsec();
 336                         secure_ram_addr(_do_nonsec_entry)(kernel_entry,
 337                                                           0, machid, r2);
 338                 } else
 339 #endif
 340                         kernel_entry(0, machid, r2);
 341         }
 342 #endif
 343 }
 344
 345 /* Main Entry point for arm bootm implementation
 346  *
 347  * Modeled after the powerpc implementation
 348  * DIFFERENCE: Instead of calling prep and go at the end
 349  * they are called if subcommand is equal 0.
 350  */
 351 int do_bootm_linux(int flag, int argc, char * const argv[],
 352                    bootm_headers_t *images)
 353 {
 354         /* No need for those on ARM */
 355         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
 356                 return -1;
 357
 358         if (flag & BOOTM_STATE_OS_PREP) {
 359                 boot_prep_linux(images);
 360                 return 0;
 361         }
 362
 363         if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
 364                 boot_jump_linux(images, flag);
 365                 return 0;
 366         }
 367
 368         boot_prep_linux(images);
 369         boot_jump_linux(images, flag);
 370         return 0;
 371 }
 372
 373 #if defined(CONFIG_BOOTM_VXWORKS)
 374 void boot_prep_vxworks(bootm_headers_t *images)
 375 {
 376 #if defined(CONFIG_OF_LIBFDT)
 377         int off;
 378
 379         if (images->ft_addr) {
 380                 off = fdt_path_offset(images->ft_addr, "/memory");
 381                 if (off < 0) {
 382 #ifdef CONFIG_ARCH_FIXUP_FDT
 383                         if (arch_fixup_fdt(images->ft_addr))
 384                                 puts("## WARNING: fixup memory failed!\n");
 385 #endif
 386                 }
 387         }
 388 #endif
 389         cleanup_before_linux();
 390 }
 391 void boot_jump_vxworks(bootm_headers_t *images)
 392 {
 393         /* ARM VxWorks requires device tree physical address to be passed */
 394         ((void (*)(void *))images->ep)(images->ft_addr);
 395 }
 396 #endif