arch/arm/lib/bootm.c

   1 /*
   2  * (C) Copyright 2002
   3  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4  * Marius Groeger <mgroeger@sysgo.de>
   5  *
   6  * Copyright (C) 2001  Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <common.h>
  25 #include <command.h>
  26 #include <image.h>
  27 #include <u-boot/zlib.h>
  28 #include <asm/byteorder.h>
  29 #include <fdt.h>
  30 #include <libfdt.h>
  31 #include <fdt_support.h>
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
  36     defined (CONFIG_CMDLINE_TAG) || \
  37     defined (CONFIG_INITRD_TAG) || \
  38     defined (CONFIG_SERIAL_TAG) || \
  39     defined (CONFIG_REVISION_TAG)
  40 static void setup_start_tag (bd_t *bd);
  41
  42 # ifdef CONFIG_SETUP_MEMORY_TAGS
  43 static void setup_memory_tags (bd_t *bd);
  44 # endif
  45 static void setup_commandline_tag (bd_t *bd, char *commandline);
  46
  47 # ifdef CONFIG_INITRD_TAG
  48 static void setup_initrd_tag (bd_t *bd, ulong initrd_start,
  49                               ulong initrd_end);
  50 # endif
  51 static void setup_end_tag (bd_t *bd);
  52
  53 static struct tag *params;
  54 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
  55
  56 static ulong get_sp(void);
  57 #if defined(CONFIG_OF_LIBFDT)
  58 static int bootm_linux_fdt(int machid, bootm_headers_t *images);
  59 #endif
  60
  61 void arch_lmb_reserve(struct lmb *lmb)
  62 {
  63         ulong sp;
  64
  65         /*
  66          * Booting a (Linux) kernel image
  67          *
  68          * Allocate space for command line and board info - the
  69          * address should be as high as possible within the reach of
  70          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  71          * memory, which means far enough below the current stack
  72          * pointer.
  73          */
  74         sp = get_sp();
  75         debug("## Current stack ends at 0x%08lx ", sp);
  76
  77         /* adjust sp by 1K to be safe */
  78         sp -= 1024;
  79         lmb_reserve(lmb, sp,
  80                     gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
  81 }
  82
  83 static void announce_and_cleanup(void)
  84 {
  85         printf("\nStarting kernel ...\n\n");
  86
  87 #ifdef CONFIG_USB_DEVICE
  88         {
  89                 extern void udc_disconnect(void);
  90                 udc_disconnect();
  91         }
  92 #endif
  93         cleanup_before_linux();
  94 }
  95
  96 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
  97 {
  98         bd_t    *bd = gd->bd;
  99         char    *s;
 100         int     machid = bd->bi_arch_number;
 101         void    (*kernel_entry)(int zero, int arch, uint params);
 102
 103 #ifdef CONFIG_CMDLINE_TAG
 104         char *commandline = getenv ("bootargs");
 105 #endif
 106
 107         if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
 108                 return 1;
 109
 110         s = getenv ("machid");
 111         if (s) {
 112                 machid = simple_strtoul (s, NULL, 16);
 113                 printf ("Using machid 0x%x from environment\n", machid);
 114         }
 115
 116         show_boot_progress (15);
 117
 118 #ifdef CONFIG_OF_LIBFDT
 119         if (images->ft_len)
 120                 return bootm_linux_fdt(machid, images);
 121 #endif
 122
 123         kernel_entry = (void (*)(int, int, uint))images->ep;
 124
 125         debug ("## Transferring control to Linux (at address %08lx) ...\n",
 126                (ulong) kernel_entry);
 127
 128 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
 129     defined (CONFIG_CMDLINE_TAG) || \
 130     defined (CONFIG_INITRD_TAG) || \
 131     defined (CONFIG_SERIAL_TAG) || \
 132     defined (CONFIG_REVISION_TAG)
 133         setup_start_tag (bd);
 134 #ifdef CONFIG_SERIAL_TAG
 135         setup_serial_tag (&params);
 136 #endif
 137 #ifdef CONFIG_REVISION_TAG
 138         setup_revision_tag (&params);
 139 #endif
 140 #ifdef CONFIG_SETUP_MEMORY_TAGS
 141         setup_memory_tags (bd);
 142 #endif
 143 #ifdef CONFIG_CMDLINE_TAG
 144         setup_commandline_tag (bd, commandline);
 145 #endif
 146 #ifdef CONFIG_INITRD_TAG
 147         if (images->rd_start && images->rd_end)
 148                 setup_initrd_tag (bd, images->rd_start, images->rd_end);
 149 #endif
 150         setup_end_tag(bd);
 151 #endif
 152
 153         announce_and_cleanup();
 154
 155         kernel_entry(0, machid, bd->bi_boot_params);
 156         /* does not return */
 157
 158         return 1;
 159 }
 160
 161 #if defined(CONFIG_OF_LIBFDT)
 162 static int fixup_memory_node(void *blob)
 163 {
 164         bd_t    *bd = gd->bd;
 165         int bank;
 166         u64 start[CONFIG_NR_DRAM_BANKS];
 167         u64 size[CONFIG_NR_DRAM_BANKS];
 168
 169         for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
 170                 start[bank] = bd->bi_dram[bank].start;
 171                 size[bank] = bd->bi_dram[bank].size;
 172         }
 173
 174         return fdt_fixup_memory_banks(blob, start, size, CONFIG_NR_DRAM_BANKS);
 175 }
 176
 177 static int bootm_linux_fdt(int machid, bootm_headers_t *images)
 178 {
 179         ulong rd_len;
 180         bd_t *bd = gd->bd;
 181         char *s;
 182         void (*kernel_entry)(int zero, int dt_machid, void *dtblob);
 183         ulong bootmap_base = getenv_bootm_low();
 184         ulong of_size = images->ft_len;
 185         char **of_flat_tree = &images->ft_addr;
 186         ulong *initrd_start = &images->initrd_start;
 187         ulong *initrd_end = &images->initrd_end;
 188         struct lmb *lmb = &images->lmb;
 189         int ret;
 190
 191         kernel_entry = (void (*)(int, int, void *))images->ep;
 192
 193         rd_len = images->rd_end - images->rd_start;
 194         ret = boot_ramdisk_high(lmb, images->rd_start, rd_len,
 195                                 initrd_start, initrd_end);
 196         if (ret)
 197                 return ret;
 198
 199         ret = boot_relocate_fdt(lmb, bootmap_base, of_flat_tree, &of_size);
 200         if (ret)
 201                 return ret;
 202
 203         debug("## Transferring control to Linux (at address %08lx) ...\n",
 204                (ulong) kernel_entry);
 205
 206         fdt_chosen(*of_flat_tree, 1);
 207
 208         fixup_memory_node(*of_flat_tree);
 209
 210         fdt_initrd(*of_flat_tree, *initrd_start, *initrd_end, 1);
 211
 212         announce_and_cleanup();
 213
 214         kernel_entry(0, machid, *of_flat_tree);
 215         /* does not return */
 216
 217         return 1;
 218 }
 219 #endif
 220
 221 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
 222     defined (CONFIG_CMDLINE_TAG) || \
 223     defined (CONFIG_INITRD_TAG) || \
 224     defined (CONFIG_SERIAL_TAG) || \
 225     defined (CONFIG_REVISION_TAG)
 226 static void setup_start_tag (bd_t *bd)
 227 {
 228         params = (struct tag *) bd->bi_boot_params;
 229
 230         params->hdr.tag = ATAG_CORE;
 231         params->hdr.size = tag_size (tag_core);
 232
 233         params->u.core.flags = 0;
 234         params->u.core.pagesize = 0;
 235         params->u.core.rootdev = 0;
 236
 237         params = tag_next (params);
 238 }
 239
 240
 241 #ifdef CONFIG_SETUP_MEMORY_TAGS
 242 static void setup_memory_tags (bd_t *bd)
 243 {
 244         int i;
 245
 246         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 247                 params->hdr.tag = ATAG_MEM;
 248                 params->hdr.size = tag_size (tag_mem32);
 249
 250                 params->u.mem.start = bd->bi_dram[i].start;
 251                 params->u.mem.size = bd->bi_dram[i].size;
 252
 253                 params = tag_next (params);
 254         }
 255 }
 256 #endif /* CONFIG_SETUP_MEMORY_TAGS */
 257
 258
 259 static void setup_commandline_tag (bd_t *bd, char *commandline)
 260 {
 261         char *p;
 262
 263         if (!commandline)
 264                 return;
 265
 266         /* eat leading white space */
 267         for (p = commandline; *p == ' '; p++);
 268
 269         /* skip non-existent command lines so the kernel will still
 270          * use its default command line.
 271          */
 272         if (*p == '\0')
 273                 return;
 274
 275         params->hdr.tag = ATAG_CMDLINE;
 276         params->hdr.size =
 277                 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
 278
 279         strcpy (params->u.cmdline.cmdline, p);
 280
 281         params = tag_next (params);
 282 }
 283
 284
 285 #ifdef CONFIG_INITRD_TAG
 286 static void setup_initrd_tag (bd_t *bd, ulong initrd_start, ulong initrd_end)
 287 {
 288         /* an ATAG_INITRD node tells the kernel where the compressed
 289          * ramdisk can be found. ATAG_RDIMG is a better name, actually.
 290          */
 291         params->hdr.tag = ATAG_INITRD2;
 292         params->hdr.size = tag_size (tag_initrd);
 293
 294         params->u.initrd.start = initrd_start;
 295         params->u.initrd.size = initrd_end - initrd_start;
 296
 297         params = tag_next (params);
 298 }
 299 #endif /* CONFIG_INITRD_TAG */
 300
 301 #ifdef CONFIG_SERIAL_TAG
 302 void setup_serial_tag (struct tag **tmp)
 303 {
 304         struct tag *params = *tmp;
 305         struct tag_serialnr serialnr;
 306         void get_board_serial(struct tag_serialnr *serialnr);
 307
 308         get_board_serial(&serialnr);
 309         params->hdr.tag = ATAG_SERIAL;
 310         params->hdr.size = tag_size (tag_serialnr);
 311         params->u.serialnr.low = serialnr.low;
 312         params->u.serialnr.high= serialnr.high;
 313         params = tag_next (params);
 314         *tmp = params;
 315 }
 316 #endif
 317
 318 #ifdef CONFIG_REVISION_TAG
 319 void setup_revision_tag(struct tag **in_params)
 320 {
 321         u32 rev = 0;
 322         u32 get_board_rev(void);
 323
 324         rev = get_board_rev();
 325         params->hdr.tag = ATAG_REVISION;
 326         params->hdr.size = tag_size (tag_revision);
 327         params->u.revision.rev = rev;
 328         params = tag_next (params);
 329 }
 330 #endif  /* CONFIG_REVISION_TAG */
 331
 332
 333 static void setup_end_tag (bd_t *bd)
 334 {
 335         params->hdr.tag = ATAG_NONE;
 336         params->hdr.size = 0;
 337 }
 338
 339 static ulong get_sp(void)
 340 {
 341         ulong ret;
 342
 343         asm("mov %0, sp" : "=r"(ret) : );
 344         return ret;
 345 }
 346
 347 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */