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 <vxworks.h>
  19 #include <u-boot/zlib.h>
  20 #include <asm/byteorder.h>
  21 #include <libfdt.h>
  22 #include <fdt_support.h>
  23 #include <asm/bootm.h>
  24 #include <asm/secure.h>
  25 #include <linux/compiler.h>
  26
  27 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
  28 #include <asm/armv7.h>
  29 #endif
  30
  31 DECLARE_GLOBAL_DATA_PTR;
  32
  33 static struct tag *params;
  34
  35 static ulong get_sp(void)
  36 {
  37         ulong ret;
  38
  39         asm("mov %0, sp" : "=r"(ret) : );
  40         return ret;
  41 }
  42
  43 void arch_lmb_reserve(struct lmb *lmb)
  44 {
  45         ulong sp;
  46
  47         /*
  48          * Booting a (Linux) kernel image
  49          *
  50          * Allocate space for command line and board info - the
  51          * address should be as high as possible within the reach of
  52          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  53          * memory, which means far enough below the current stack
  54          * pointer.
  55          */
  56         sp = get_sp();
  57         debug("## Current stack ends at 0x%08lx ", sp);
  58
  59         /* adjust sp by 4K to be safe */
  60         sp -= 4096;
  61         lmb_reserve(lmb, sp,
  62                     gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
  63 }
  64
  65 /**
  66  * announce_and_cleanup() - Print message and prepare for kernel boot
  67  *
  68  * @fake: non-zero to do everything except actually boot
  69  */
  70 static void announce_and_cleanup(int fake)
  71 {
  72         printf("\nStarting kernel ...%s\n\n", fake ?
  73                 "(fake run for tracing)" : "");
  74         bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  75 #ifdef CONFIG_BOOTSTAGE_FDT
  76         bootstage_fdt_add_report();
  77 #endif
  78 #ifdef CONFIG_BOOTSTAGE_REPORT
  79         bootstage_report();
  80 #endif
  81
  82 #ifdef CONFIG_USB_DEVICE
  83         udc_disconnect();
  84 #endif
  85         cleanup_before_linux();
  86 }
  87
  88 static void setup_start_tag (bd_t *bd)
  89 {
  90         params = (struct tag *)bd->bi_boot_params;
  91
  92         params->hdr.tag = ATAG_CORE;
  93         params->hdr.size = tag_size (tag_core);
  94
  95         params->u.core.flags = 0;
  96         params->u.core.pagesize = 0;
  97         params->u.core.rootdev = 0;
  98
  99         params = tag_next (params);
 100 }
 101
 102 static void setup_memory_tags(bd_t *bd)
 103 {
 104         int i;
 105
 106         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 107                 params->hdr.tag = ATAG_MEM;
 108                 params->hdr.size = tag_size (tag_mem32);
 109
 110                 params->u.mem.start = bd->bi_dram[i].start;
 111                 params->u.mem.size = bd->bi_dram[i].size;
 112
 113                 params = tag_next (params);
 114         }
 115 }
 116
 117 static void setup_commandline_tag(bd_t *bd, char *commandline)
 118 {
 119         char *p;
 120
 121         if (!commandline)
 122                 return;
 123
 124         /* eat leading white space */
 125         for (p = commandline; *p == ' '; p++);
 126
 127         /* skip non-existent command lines so the kernel will still
 128          * use its default command line.
 129          */
 130         if (*p == '\0')
 131                 return;
 132
 133         params->hdr.tag = ATAG_CMDLINE;
 134         params->hdr.size =
 135                 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
 136
 137         strcpy (params->u.cmdline.cmdline, p);
 138
 139         params = tag_next (params);
 140 }
 141
 142 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
 143 {
 144         /* an ATAG_INITRD node tells the kernel where the compressed
 145          * ramdisk can be found. ATAG_RDIMG is a better name, actually.
 146          */
 147         params->hdr.tag = ATAG_INITRD2;
 148         params->hdr.size = tag_size (tag_initrd);
 149
 150         params->u.initrd.start = initrd_start;
 151         params->u.initrd.size = initrd_end - initrd_start;
 152
 153         params = tag_next (params);
 154 }
 155
 156 static void setup_serial_tag(struct tag **tmp)
 157 {
 158         struct tag *params = *tmp;
 159         struct tag_serialnr serialnr;
 160
 161         get_board_serial(&serialnr);
 162         params->hdr.tag = ATAG_SERIAL;
 163         params->hdr.size = tag_size (tag_serialnr);
 164         params->u.serialnr.low = serialnr.low;
 165         params->u.serialnr.high= serialnr.high;
 166         params = tag_next (params);
 167         *tmp = params;
 168 }
 169
 170 static void setup_revision_tag(struct tag **in_params)
 171 {
 172         u32 rev = 0;
 173
 174         rev = get_board_rev();
 175         params->hdr.tag = ATAG_REVISION;
 176         params->hdr.size = tag_size (tag_revision);
 177         params->u.revision.rev = rev;
 178         params = tag_next (params);
 179 }
 180
 181 static void setup_end_tag(bd_t *bd)
 182 {
 183         params->hdr.tag = ATAG_NONE;
 184         params->hdr.size = 0;
 185 }
 186
 187 __weak void setup_board_tags(struct tag **in_params) {}
 188
 189 #ifdef CONFIG_ARM64
 190 static void do_nonsec_virt_switch(void)
 191 {
 192         smp_kick_all_cpus();
 193         flush_dcache_all();     /* flush cache before swtiching to EL2 */
 194         armv8_switch_to_el2();
 195 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
 196         armv8_switch_to_el1();
 197 #endif
 198 }
 199 #endif
 200
 201 /* Subcommand: PREP */
 202 static void boot_prep_linux(bootm_headers_t *images)
 203 {
 204         char *commandline = getenv("bootargs");
 205
 206         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
 207 #ifdef CONFIG_OF_LIBFDT
 208                 debug("using: FDT\n");
 209                 if (image_setup_linux(images)) {
 210                         printf("FDT creation failed! hanging...");
 211                         hang();
 212                 }
 213 #endif
 214         } else if (BOOTM_ENABLE_TAGS) {
 215                 debug("using: ATAGS\n");
 216                 setup_start_tag(gd->bd);
 217                 if (BOOTM_ENABLE_SERIAL_TAG)
 218                         setup_serial_tag(&params);
 219                 if (BOOTM_ENABLE_CMDLINE_TAG)
 220                         setup_commandline_tag(gd->bd, commandline);
 221                 if (BOOTM_ENABLE_REVISION_TAG)
 222                         setup_revision_tag(&params);
 223                 if (BOOTM_ENABLE_MEMORY_TAGS)
 224                         setup_memory_tags(gd->bd);
 225                 if (BOOTM_ENABLE_INITRD_TAG) {
 226                         if (images->rd_start && images->rd_end) {
 227                                 setup_initrd_tag(gd->bd, images->rd_start,
 228                                                  images->rd_end);
 229                         }
 230                 }
 231                 setup_board_tags(&params);
 232                 setup_end_tag(gd->bd);
 233         } else {
 234                 printf("FDT and ATAGS support not compiled in - hanging\n");
 235                 hang();
 236         }
 237 }
 238
 239 /* Subcommand: GO */
 240 static void boot_jump_linux(bootm_headers_t *images, int flag)
 241 {
 242 #ifdef CONFIG_ARM64
 243         void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
 244                         void *res2);
 245         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 246
 247         kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
 248                                 void *res2))images->ep;
 249
 250         debug("## Transferring control to Linux (at address %lx)...\n",
 251                 (ulong) kernel_entry);
 252         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 253
 254         announce_and_cleanup(fake);
 255
 256         if (!fake) {
 257                 do_nonsec_virt_switch();
 258                 kernel_entry(images->ft_addr, NULL, NULL, NULL);
 259         }
 260 #else
 261         unsigned long machid = gd->bd->bi_arch_number;
 262         char *s;
 263         void (*kernel_entry)(int zero, int arch, uint params);
 264         unsigned long r2;
 265         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 266
 267         kernel_entry = (void (*)(int, int, uint))images->ep;
 268
 269         s = getenv("machid");
 270         if (s) {
 271                 strict_strtoul(s, 16, &machid);
 272                 printf("Using machid 0x%lx from environment\n", machid);
 273         }
 274
 275         debug("## Transferring control to Linux (at address %08lx)" \
 276                 "...\n", (ulong) kernel_entry);
 277         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 278         announce_and_cleanup(fake);
 279
 280         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
 281                 r2 = (unsigned long)images->ft_addr;
 282         else
 283                 r2 = gd->bd->bi_boot_params;
 284
 285         if (!fake) {
 286 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
 287                 armv7_init_nonsec();
 288                 secure_ram_addr(_do_nonsec_entry)(kernel_entry,
 289                                                   0, machid, r2);
 290 #else
 291                 kernel_entry(0, machid, r2);
 292 #endif
 293         }
 294 #endif
 295 }
 296
 297 /* Main Entry point for arm bootm implementation
 298  *
 299  * Modeled after the powerpc implementation
 300  * DIFFERENCE: Instead of calling prep and go at the end
 301  * they are called if subcommand is equal 0.
 302  */
 303 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
 304 {
 305         /* No need for those on ARM */
 306         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
 307                 return -1;
 308
 309         if (flag & BOOTM_STATE_OS_PREP) {
 310                 boot_prep_linux(images);
 311                 return 0;
 312         }
 313
 314         if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
 315                 boot_jump_linux(images, flag);
 316                 return 0;
 317         }
 318
 319         boot_prep_linux(images);
 320         boot_jump_linux(images, flag);
 321         return 0;
 322 }
 323
 324 #ifdef CONFIG_CMD_BOOTZ
 325
 326 struct zimage_header {
 327         uint32_t        code[9];
 328         uint32_t        zi_magic;
 329         uint32_t        zi_start;
 330         uint32_t        zi_end;
 331 };
 332
 333 #define LINUX_ARM_ZIMAGE_MAGIC  0x016f2818
 334
 335 int bootz_setup(ulong image, ulong *start, ulong *end)
 336 {
 337         struct zimage_header *zi;
 338
 339         zi = (struct zimage_header *)map_sysmem(image, 0);
 340         if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) {
 341                 puts("Bad Linux ARM zImage magic!\n");
 342                 return 1;
 343         }
 344
 345         *start = zi->zi_start;
 346         *end = zi->zi_end;
 347
 348         printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n", image, *start,
 349               *end);
 350
 351         return 0;
 352 }
 353
 354 #endif  /* CONFIG_CMD_BOOTZ */
 355
 356 #if defined(CONFIG_BOOTM_VXWORKS)
 357 void boot_prep_vxworks(bootm_headers_t *images)
 358 {
 359 #if defined(CONFIG_OF_LIBFDT)
 360         int off;
 361
 362         if (images->ft_addr) {
 363                 off = fdt_path_offset(images->ft_addr, "/memory");
 364                 if (off < 0) {
 365                         if (arch_fixup_fdt(images->ft_addr))
 366                                 puts("## WARNING: fixup memory failed!\n");
 367                 }
 368         }
 369 #endif
 370         cleanup_before_linux();
 371 }
 372 void boot_jump_vxworks(bootm_headers_t *images)
 373 {
 374         /* ARM VxWorks requires device tree physical address to be passed */
 375         ((void (*)(void *))images->ep)(images->ft_addr);
 376 }
 377 #endif