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 <libfdt.h>
  34 #include <fdt_support.h>
  35 #include <asm/bootm.h>
  36 #include <linux/compiler.h>
  37
  38 DECLARE_GLOBAL_DATA_PTR;
  39
  40 static struct tag *params;
  41
  42 static ulong get_sp(void)
  43 {
  44         ulong ret;
  45
  46         asm("mov %0, sp" : "=r"(ret) : );
  47         return ret;
  48 }
  49
  50 void arch_lmb_reserve(struct lmb *lmb)
  51 {
  52         ulong sp;
  53
  54         /*
  55          * Booting a (Linux) kernel image
  56          *
  57          * Allocate space for command line and board info - the
  58          * address should be as high as possible within the reach of
  59          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  60          * memory, which means far enough below the current stack
  61          * pointer.
  62          */
  63         sp = get_sp();
  64         debug("## Current stack ends at 0x%08lx ", sp);
  65
  66         /* adjust sp by 4K to be safe */
  67         sp -= 4096;
  68         lmb_reserve(lmb, sp,
  69                     gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
  70 }
  71
  72 #ifdef CONFIG_OF_LIBFDT
  73 static int fixup_memory_node(void *blob)
  74 {
  75         bd_t    *bd = gd->bd;
  76         int bank;
  77         u64 start[CONFIG_NR_DRAM_BANKS];
  78         u64 size[CONFIG_NR_DRAM_BANKS];
  79
  80         for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
  81                 start[bank] = bd->bi_dram[bank].start;
  82                 size[bank] = bd->bi_dram[bank].size;
  83         }
  84
  85         return fdt_fixup_memory_banks(blob, start, size, CONFIG_NR_DRAM_BANKS);
  86 }
  87 #endif
  88
  89 static void announce_and_cleanup(void)
  90 {
  91         printf("\nStarting kernel ...\n\n");
  92         bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  93 #ifdef CONFIG_BOOTSTAGE_FDT
  94         bootstage_fdt_add_report();
  95 #endif
  96 #ifdef CONFIG_BOOTSTAGE_REPORT
  97         bootstage_report();
  98 #endif
  99
 100 #ifdef CONFIG_USB_DEVICE
 101         udc_disconnect();
 102 #endif
 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 #ifdef CONFIG_OF_LIBFDT
 206 static int create_fdt(bootm_headers_t *images)
 207 {
 208         ulong of_size = images->ft_len;
 209         char **of_flat_tree = &images->ft_addr;
 210         ulong *initrd_start = &images->initrd_start;
 211         ulong *initrd_end = &images->initrd_end;
 212         struct lmb *lmb = &images->lmb;
 213         ulong rd_len;
 214         int ret;
 215
 216         debug("using: FDT\n");
 217
 218         boot_fdt_add_mem_rsv_regions(lmb, *of_flat_tree);
 219
 220         rd_len = images->rd_end - images->rd_start;
 221         ret = boot_ramdisk_high(lmb, images->rd_start, rd_len,
 222                         initrd_start, initrd_end);
 223         if (ret)
 224                 return ret;
 225
 226         ret = boot_relocate_fdt(lmb, of_flat_tree, &of_size);
 227         if (ret)
 228                 return ret;
 229
 230         fdt_chosen(*of_flat_tree, 1);
 231         fixup_memory_node(*of_flat_tree);
 232         fdt_fixup_ethernet(*of_flat_tree);
 233         fdt_initrd(*of_flat_tree, *initrd_start, *initrd_end, 1);
 234 #ifdef CONFIG_OF_BOARD_SETUP
 235         ft_board_setup(*of_flat_tree, gd->bd);
 236 #endif
 237
 238         return 0;
 239 }
 240 #endif
 241
 242 __weak void setup_board_tags(struct tag **in_params) {}
 243
 244 /* Subcommand: PREP */
 245 static void boot_prep_linux(bootm_headers_t *images)
 246 {
 247         char *commandline = getenv("bootargs");
 248
 249         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
 250 #ifdef CONFIG_OF_LIBFDT
 251                 debug("using: FDT\n");
 252                 if (create_fdt(images)) {
 253                         printf("FDT creation failed! hanging...");
 254                         hang();
 255                 }
 256 #endif
 257         } else if (BOOTM_ENABLE_TAGS) {
 258                 debug("using: ATAGS\n");
 259                 setup_start_tag(gd->bd);
 260                 if (BOOTM_ENABLE_SERIAL_TAG)
 261                         setup_serial_tag(&params);
 262                 if (BOOTM_ENABLE_CMDLINE_TAG)
 263                         setup_commandline_tag(gd->bd, commandline);
 264                 if (BOOTM_ENABLE_REVISION_TAG)
 265                         setup_revision_tag(&params);
 266                 if (BOOTM_ENABLE_MEMORY_TAGS)
 267                         setup_memory_tags(gd->bd);
 268                 if (BOOTM_ENABLE_INITRD_TAG) {
 269                         if (images->rd_start && images->rd_end) {
 270                                 setup_initrd_tag(gd->bd, images->rd_start,
 271                                                  images->rd_end);
 272                         }
 273                 }
 274                 setup_board_tags(&params);
 275                 setup_end_tag(gd->bd);
 276         } else {
 277                 printf("FDT and ATAGS support not compiled in - hanging\n");
 278                 hang();
 279         }
 280 }
 281
 282 /* Subcommand: GO */
 283 static void boot_jump_linux(bootm_headers_t *images)
 284 {
 285         unsigned long machid = gd->bd->bi_arch_number;
 286         char *s;
 287         void (*kernel_entry)(int zero, int arch, uint params);
 288         unsigned long r2;
 289
 290         kernel_entry = (void (*)(int, int, uint))images->ep;
 291
 292         s = getenv("machid");
 293         if (s) {
 294                 strict_strtoul(s, 16, &machid);
 295                 printf("Using machid 0x%lx from environment\n", machid);
 296         }
 297
 298         debug("## Transferring control to Linux (at address %08lx)" \
 299                 "...\n", (ulong) kernel_entry);
 300         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 301         announce_and_cleanup();
 302
 303         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
 304                 r2 = (unsigned long)images->ft_addr;
 305         else
 306                 r2 = gd->bd->bi_boot_params;
 307
 308         kernel_entry(0, machid, r2);
 309 }
 310
 311 /* Main Entry point for arm bootm implementation
 312  *
 313  * Modeled after the powerpc implementation
 314  * DIFFERENCE: Instead of calling prep and go at the end
 315  * they are called if subcommand is equal 0.
 316  */
 317 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
 318 {
 319         /* No need for those on ARM */
 320         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
 321                 return -1;
 322
 323         if (flag & BOOTM_STATE_OS_PREP) {
 324                 boot_prep_linux(images);
 325                 return 0;
 326         }
 327
 328         if (flag & BOOTM_STATE_OS_GO) {
 329                 boot_jump_linux(images);
 330                 return 0;
 331         }
 332
 333         boot_prep_linux(images);
 334         boot_jump_linux(images);
 335         return 0;
 336 }
 337
 338 #ifdef CONFIG_CMD_BOOTZ
 339
 340 struct zimage_header {
 341         uint32_t        code[9];
 342         uint32_t        zi_magic;
 343         uint32_t        zi_start;
 344         uint32_t        zi_end;
 345 };
 346
 347 #define LINUX_ARM_ZIMAGE_MAGIC  0x016f2818
 348
 349 int bootz_setup(void *image, void **start, void **end)
 350 {
 351         struct zimage_header *zi = (struct zimage_header *)image;
 352
 353         if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) {
 354                 puts("Bad Linux ARM zImage magic!\n");
 355                 return 1;
 356         }
 357
 358         *start = (void *)zi->zi_start;
 359         *end = (void *)zi->zi_end;
 360
 361         debug("Kernel image @ 0x%08x [ 0x%08x - 0x%08x ]\n",
 362                 (uint32_t)image, (uint32_t)*start, (uint32_t)*end);
 363
 364         return 0;
 365 }
 366 #endif  /* CONFIG_CMD_BOOTZ */