LXR uboot/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
  33DECLARE_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)
  40static void setup_start_tag (bd_t *bd);
  41
  42# ifdef CONFIG_SETUP_MEMORY_TAGS
  43static void setup_memory_tags (bd_t *bd);
  44# endif
  45static void setup_commandline_tag (bd_t *bd, char *commandline);
  46
  47# ifdef CONFIG_INITRD_TAG
  48static void setup_initrd_tag (bd_t *bd, ulong initrd_start,
  49                              ulong initrd_end);
  50# endif
  51static void setup_end_tag (bd_t *bd);
  52
  53static struct tag *params;
  54#endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
  55
  56static ulong get_sp(void);
  57#if defined(CONFIG_OF_LIBFDT)
  58static int bootm_linux_fdt(int machid, bootm_headers_t *images);
  59#endif
  60
  61void 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
  83static 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
  96int 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)
 162static 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
 177static int bootm_linux_fdt(int machid, bootm_headers_t *images)
 178{
 179        ulong rd_len;
 180        void (*kernel_entry)(int zero, int dt_machid, void *dtblob);
 181        ulong bootmap_base = getenv_bootm_low();
 182        ulong of_size = images->ft_len;
 183        char **of_flat_tree = &images->ft_addr;
 184        ulong *initrd_start = &images->initrd_start;
 185        ulong *initrd_end = &images->initrd_end;
 186        struct lmb *lmb = &images->lmb;
 187        int ret;
 188
 189        kernel_entry = (void (*)(int, int, void *))images->ep;
 190
 191        rd_len = images->rd_end - images->rd_start;
 192        ret = boot_ramdisk_high(lmb, images->rd_start, rd_len,
 193                                initrd_start, initrd_end);
 194        if (ret)
 195                return ret;
 196
 197        ret = boot_relocate_fdt(lmb, bootmap_base, of_flat_tree, &of_size);
 198        if (ret)
 199                return ret;
 200
 201        debug("## Transferring control to Linux (at address %08lx) ...\n",
 202               (ulong) kernel_entry);
 203
 204        fdt_chosen(*of_flat_tree, 1);
 205
 206        fixup_memory_node(*of_flat_tree);
 207
 208        fdt_initrd(*of_flat_tree, *initrd_start, *initrd_end, 1);
 209
 210        announce_and_cleanup();
 211
 212        kernel_entry(0, machid, *of_flat_tree);
 213        /* does not return */
 214
 215        return 1;
 216}
 217#endif
 218
 219#if defined (CONFIG_SETUP_MEMORY_TAGS) || \
 220    defined (CONFIG_CMDLINE_TAG) || \
 221    defined (CONFIG_INITRD_TAG) || \
 222    defined (CONFIG_SERIAL_TAG) || \
 223    defined (CONFIG_REVISION_TAG)
 224static void setup_start_tag (bd_t *bd)
 225{
 226        params = (struct tag *) bd->bi_boot_params;
 227
 228        params->hdr.tag = ATAG_CORE;
 229        params->hdr.size = tag_size (tag_core);
 230
 231        params->u.core.flags = 0;
 232        params->u.core.pagesize = 0;
 233        params->u.core.rootdev = 0;
 234
 235        params = tag_next (params);
 236}
 237
 238
 239#ifdef CONFIG_SETUP_MEMORY_TAGS
 240static void setup_memory_tags (bd_t *bd)
 241{
 242        int i;
 243
 244        for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 245                params->hdr.tag = ATAG_MEM;
 246                params->hdr.size = tag_size (tag_mem32);
 247
 248                params->u.mem.start = bd->bi_dram[i].start;
 249                params->u.mem.size = bd->bi_dram[i].size;
 250
 251                params = tag_next (params);
 252        }
 253}
 254#endif /* CONFIG_SETUP_MEMORY_TAGS */
 255
 256
 257static void setup_commandline_tag (bd_t *bd, char *commandline)
 258{
 259        char *p;
 260
 261        if (!commandline)
 262                return;
 263
 264        /* eat leading white space */
 265        for (p = commandline; *p == ' '; p++);
 266
 267        /* skip non-existent command lines so the kernel will still
 268         * use its default command line.
 269         */
 270        if (*p == '\0')
 271                return;
 272
 273        params->hdr.tag = ATAG_CMDLINE;
 274        params->hdr.size =
 275                (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
 276
 277        strcpy (params->u.cmdline.cmdline, p);
 278
 279        params = tag_next (params);
 280}
 281
 282
 283#ifdef CONFIG_INITRD_TAG
 284static void setup_initrd_tag (bd_t *bd, ulong initrd_start, ulong initrd_end)
 285{
 286        /* an ATAG_INITRD node tells the kernel where the compressed
 287         * ramdisk can be found. ATAG_RDIMG is a better name, actually.
 288         */
 289        params->hdr.tag = ATAG_INITRD2;
 290        params->hdr.size = tag_size (tag_initrd);
 291
 292        params->u.initrd.start = initrd_start;
 293        params->u.initrd.size = initrd_end - initrd_start;
 294
 295        params = tag_next (params);
 296}
 297#endif /* CONFIG_INITRD_TAG */
 298
 299#ifdef CONFIG_SERIAL_TAG
 300void setup_serial_tag (struct tag **tmp)
 301{
 302        struct tag *params = *tmp;
 303        struct tag_serialnr serialnr;
 304        void get_board_serial(struct tag_serialnr *serialnr);
 305
 306        get_board_serial(&serialnr);
 307        params->hdr.tag = ATAG_SERIAL;
 308        params->hdr.size = tag_size (tag_serialnr);
 309        params->u.serialnr.low = serialnr.low;
 310        params->u.serialnr.high= serialnr.high;
 311        params = tag_next (params);
 312        *tmp = params;
 313}
 314#endif
 315
 316#ifdef CONFIG_REVISION_TAG
 317void setup_revision_tag(struct tag **in_params)
 318{
 319        u32 rev = 0;
 320        u32 get_board_rev(void);
 321
 322        rev = get_board_rev();
 323        params->hdr.tag = ATAG_REVISION;
 324        params->hdr.size = tag_size (tag_revision);
 325        params->u.revision.rev = rev;
 326        params = tag_next (params);
 327}
 328#endif  /* CONFIG_REVISION_TAG */
 329
 330
 331static void setup_end_tag (bd_t *bd)
 332{
 333        params->hdr.tag = ATAG_NONE;
 334        params->hdr.size = 0;
 335}
 336
 337static ulong get_sp(void)
 338{
 339        ulong ret;
 340
 341        asm("mov %0, sp" : "=r"(ret) : );
 342        return ret;
 343}
 344
 345#endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
 346