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  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  */
  27
  28 #include <common.h>
  29 #include <command.h>
  30 #include <image.h>
  31 #include <u-boot/zlib.h>
  32 #include <asm/byteorder.h>
  33 #include <fdt.h>
  34 #include <libfdt.h>
  35 #include <fdt_support.h>
  36 #include <asm/bootm.h>
  37
  38 DECLARE_GLOBAL_DATA_PTR;
  39
  40 #if defined(CONFIG_SETUP_MEMORY_TAGS) || \
  41         defined(CONFIG_CMDLINE_TAG) || \
  42         defined(CONFIG_INITRD_TAG) || \
  43         defined(CONFIG_SERIAL_TAG) || \
  44         defined(CONFIG_REVISION_TAG)
  45 static struct tag *params;
  46 #endif
  47
  48 static ulong get_sp(void)
  49 {
  50         ulong ret;
  51
  52         asm("mov %0, sp" : "=r"(ret) : );
  53         return ret;
  54 }
  55
  56 void arch_lmb_reserve(struct lmb *lmb)
  57 {
  58         ulong sp;
  59
  60         /*
  61          * Booting a (Linux) kernel image
  62          *
  63          * Allocate space for command line and board info - the
  64          * address should be as high as possible within the reach of
  65          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  66          * memory, which means far enough below the current stack
  67          * pointer.
  68          */
  69         sp = get_sp();
  70         debug("## Current stack ends at 0x%08lx ", sp);
  71
  72         /* adjust sp by 4K to be safe */
  73         sp -= 4096;
  74         lmb_reserve(lmb, sp,
  75                     gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
  76 }
  77
  78 #ifdef CONFIG_OF_LIBFDT
  79 static int fixup_memory_node(void *blob)
  80 {
  81         bd_t    *bd = gd->bd;
  82         int bank;
  83         u64 start[CONFIG_NR_DRAM_BANKS];
  84         u64 size[CONFIG_NR_DRAM_BANKS];
  85
  86         for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
  87                 start[bank] = bd->bi_dram[bank].start;
  88                 size[bank] = bd->bi_dram[bank].size;
  89         }
  90
  91         return fdt_fixup_memory_banks(blob, start, size, CONFIG_NR_DRAM_BANKS);
  92 }
  93 #endif
  94
  95 static void announce_and_cleanup(void)
  96 {
  97         printf("\nStarting kernel ...\n\n");
  98         bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  99 #ifdef CONFIG_BOOTSTAGE_FDT
 100         bootstage_fdt_add_report();
 101 #endif
 102 #ifdef CONFIG_BOOTSTAGE_REPORT
 103         bootstage_report();
 104 #endif
 105
 106 #ifdef CONFIG_USB_DEVICE
 107         udc_disconnect();
 108 #endif
 109         cleanup_before_linux();
 110 }
 111
 112 #if defined(CONFIG_SETUP_MEMORY_TAGS) || \
 113         defined(CONFIG_CMDLINE_TAG) || \
 114         defined(CONFIG_INITRD_TAG) || \
 115         defined(CONFIG_SERIAL_TAG) || \
 116         defined(CONFIG_REVISION_TAG)
 117 static void setup_start_tag (bd_t *bd)
 118 {
 119         params = (struct tag *)bd->bi_boot_params;
 120
 121         params->hdr.tag = ATAG_CORE;
 122         params->hdr.size = tag_size (tag_core);
 123
 124         params->u.core.flags = 0;
 125         params->u.core.pagesize = 0;
 126         params->u.core.rootdev = 0;
 127
 128         params = tag_next (params);
 129 }
 130 #endif
 131
 132 #ifdef CONFIG_SETUP_MEMORY_TAGS
 133 static void setup_memory_tags(bd_t *bd)
 134 {
 135         int i;
 136
 137         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 138                 params->hdr.tag = ATAG_MEM;
 139                 params->hdr.size = tag_size (tag_mem32);
 140
 141                 params->u.mem.start = bd->bi_dram[i].start;
 142                 params->u.mem.size = bd->bi_dram[i].size;
 143
 144                 params = tag_next (params);
 145         }
 146 }
 147 #endif
 148
 149 #ifdef CONFIG_CMDLINE_TAG
 150 static void setup_commandline_tag(bd_t *bd, char *commandline)
 151 {
 152         char *p;
 153
 154         if (!commandline)
 155                 return;
 156
 157         /* eat leading white space */
 158         for (p = commandline; *p == ' '; p++);
 159
 160         /* skip non-existent command lines so the kernel will still
 161          * use its default command line.
 162          */
 163         if (*p == '\0')
 164                 return;
 165
 166         params->hdr.tag = ATAG_CMDLINE;
 167         params->hdr.size =
 168                 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
 169
 170         strcpy (params->u.cmdline.cmdline, p);
 171
 172         params = tag_next (params);
 173 }
 174 #endif
 175
 176 #ifdef CONFIG_INITRD_TAG
 177 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
 178 {
 179         /* an ATAG_INITRD node tells the kernel where the compressed
 180          * ramdisk can be found. ATAG_RDIMG is a better name, actually.
 181          */
 182         params->hdr.tag = ATAG_INITRD2;
 183         params->hdr.size = tag_size (tag_initrd);
 184
 185         params->u.initrd.start = initrd_start;
 186         params->u.initrd.size = initrd_end - initrd_start;
 187
 188         params = tag_next (params);
 189 }
 190 #endif
 191
 192 #ifdef CONFIG_SERIAL_TAG
 193 void setup_serial_tag(struct tag **tmp)
 194 {
 195         struct tag *params = *tmp;
 196         struct tag_serialnr serialnr;
 197         void get_board_serial(struct tag_serialnr *serialnr);
 198
 199         get_board_serial(&serialnr);
 200         params->hdr.tag = ATAG_SERIAL;
 201         params->hdr.size = tag_size (tag_serialnr);
 202         params->u.serialnr.low = serialnr.low;
 203         params->u.serialnr.high= serialnr.high;
 204         params = tag_next (params);
 205         *tmp = params;
 206 }
 207 #endif
 208
 209 #ifdef CONFIG_REVISION_TAG
 210 void setup_revision_tag(struct tag **in_params)
 211 {
 212         u32 rev = 0;
 213         u32 get_board_rev(void);
 214
 215         rev = get_board_rev();
 216         params->hdr.tag = ATAG_REVISION;
 217         params->hdr.size = tag_size (tag_revision);
 218         params->u.revision.rev = rev;
 219         params = tag_next (params);
 220 }
 221 #endif
 222
 223 #if defined(CONFIG_SETUP_MEMORY_TAGS) || \
 224         defined(CONFIG_CMDLINE_TAG) || \
 225         defined(CONFIG_INITRD_TAG) || \
 226         defined(CONFIG_SERIAL_TAG) || \
 227         defined(CONFIG_REVISION_TAG)
 228 static void setup_end_tag(bd_t *bd)
 229 {
 230         params->hdr.tag = ATAG_NONE;
 231         params->hdr.size = 0;
 232 }
 233 #endif
 234
 235 #ifdef CONFIG_OF_LIBFDT
 236 static int create_fdt(bootm_headers_t *images)
 237 {
 238         ulong of_size = images->ft_len;
 239         char **of_flat_tree = &images->ft_addr;
 240         ulong *initrd_start = &images->initrd_start;
 241         ulong *initrd_end = &images->initrd_end;
 242         struct lmb *lmb = &images->lmb;
 243         ulong rd_len;
 244         int ret;
 245
 246         debug("using: FDT\n");
 247
 248         boot_fdt_add_mem_rsv_regions(lmb, *of_flat_tree);
 249
 250         rd_len = images->rd_end - images->rd_start;
 251         ret = boot_ramdisk_high(lmb, images->rd_start, rd_len,
 252                         initrd_start, initrd_end);
 253         if (ret)
 254                 return ret;
 255
 256         ret = boot_relocate_fdt(lmb, of_flat_tree, &of_size);
 257         if (ret)
 258                 return ret;
 259
 260         fdt_chosen(*of_flat_tree, 1);
 261         fixup_memory_node(*of_flat_tree);
 262         fdt_fixup_ethernet(*of_flat_tree);
 263         fdt_initrd(*of_flat_tree, *initrd_start, *initrd_end, 1);
 264 #ifdef CONFIG_OF_BOARD_SETUP
 265         ft_board_setup(*of_flat_tree, gd->bd);
 266 #endif
 267
 268         return 0;
 269 }
 270 #endif
 271
 272 /* Subcommand: PREP */
 273 static void boot_prep_linux(bootm_headers_t *images)
 274 {
 275 #ifdef CONFIG_CMDLINE_TAG
 276         char *commandline = getenv("bootargs");
 277 #endif
 278
 279 #ifdef CONFIG_OF_LIBFDT
 280         if (images->ft_len) {
 281                 debug("using: FDT\n");
 282                 if (create_fdt(images)) {
 283                         printf("FDT creation failed! hanging...");
 284                         hang();
 285                 }
 286         } else
 287 #endif
 288         {
 289 #if defined(CONFIG_SETUP_MEMORY_TAGS) || \
 290         defined(CONFIG_CMDLINE_TAG) || \
 291         defined(CONFIG_INITRD_TAG) || \
 292         defined(CONFIG_SERIAL_TAG) || \
 293         defined(CONFIG_REVISION_TAG)
 294                 debug("using: ATAGS\n");
 295                 setup_start_tag(gd->bd);
 296 #ifdef CONFIG_SERIAL_TAG
 297                 setup_serial_tag(&params);
 298 #endif
 299 #ifdef CONFIG_CMDLINE_TAG
 300                 setup_commandline_tag(gd->bd, commandline);
 301 #endif
 302 #ifdef CONFIG_REVISION_TAG
 303                 setup_revision_tag(&params);
 304 #endif
 305 #ifdef CONFIG_SETUP_MEMORY_TAGS
 306                 setup_memory_tags(gd->bd);
 307 #endif
 308 #ifdef CONFIG_INITRD_TAG
 309                 if (images->rd_start && images->rd_end)
 310                         setup_initrd_tag(gd->bd, images->rd_start,
 311                         images->rd_end);
 312 #endif
 313                 setup_end_tag(gd->bd);
 314 #else /* all tags */
 315                 printf("FDT and ATAGS support not compiled in - hanging\n");
 316                 hang();
 317 #endif /* all tags */
 318         }
 319 }
 320
 321 /* Subcommand: GO */
 322 static void boot_jump_linux(bootm_headers_t *images)
 323 {
 324         unsigned long machid = gd->bd->bi_arch_number;
 325         char *s;
 326         void (*kernel_entry)(int zero, int arch, uint params);
 327         unsigned long r2;
 328
 329         kernel_entry = (void (*)(int, int, uint))images->ep;
 330
 331         s = getenv("machid");
 332         if (s) {
 333                 strict_strtoul(s, 16, &machid);
 334                 printf("Using machid 0x%lx from environment\n", machid);
 335         }
 336
 337         debug("## Transferring control to Linux (at address %08lx)" \
 338                 "...\n", (ulong) kernel_entry);
 339         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 340         announce_and_cleanup();
 341
 342 #ifdef CONFIG_OF_LIBFDT
 343         if (images->ft_len)
 344                 r2 = (unsigned long)images->ft_addr;
 345         else
 346 #endif
 347                 r2 = gd->bd->bi_boot_params;
 348
 349         kernel_entry(0, machid, r2);
 350 }
 351
 352 /* Main Entry point for arm bootm implementation
 353  *
 354  * Modeled after the powerpc implementation
 355  * DIFFERENCE: Instead of calling prep and go at the end
 356  * they are called if subcommand is equal 0.
 357  */
 358 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
 359 {
 360         /* No need for those on ARM */
 361         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
 362                 return -1;
 363
 364         if (flag & BOOTM_STATE_OS_PREP) {
 365                 boot_prep_linux(images);
 366                 return 0;
 367         }
 368
 369         if (flag & BOOTM_STATE_OS_GO) {
 370                 boot_jump_linux(images);
 371                 return 0;
 372         }
 373
 374         boot_prep_linux(images);
 375         boot_jump_linux(images);
 376         return 0;
 377 }
 378
 379 #ifdef CONFIG_CMD_BOOTZ
 380
 381 struct zimage_header {
 382         uint32_t        code[9];
 383         uint32_t        zi_magic;
 384         uint32_t        zi_start;
 385         uint32_t        zi_end;
 386 };
 387
 388 #define LINUX_ARM_ZIMAGE_MAGIC  0x016f2818
 389
 390 int bootz_setup(void *image, void **start, void **end)
 391 {
 392         struct zimage_header *zi = (struct zimage_header *)image;
 393
 394         if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) {
 395                 puts("Bad Linux ARM zImage magic!\n");
 396                 return 1;
 397         }
 398
 399         *start = (void *)zi->zi_start;
 400         *end = (void *)zi->zi_end;
 401
 402         debug("Kernel image @ 0x%08x [ 0x%08x - 0x%08x ]\n",
 403                 (uint32_t)image, (uint32_t)*start, (uint32_t)*end);
 404
 405         return 0;
 406 }
 407 #endif  /* CONFIG_CMD_BOOTZ */