LXR uboot/lib_m68k/bootm.c

   1/*
   2 * (C) Copyright 2003
   3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 *
   5 * See file CREDITS for list of people who contributed to this
   6 * project.
   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 <bzlib.h>
  29#include <watchdog.h>
  30#include <environment.h>
  31#include <asm/byteorder.h>
  32#ifdef CONFIG_SHOW_BOOT_PROGRESS
  33# include <status_led.h>
  34#endif
  35
  36DECLARE_GLOBAL_DATA_PTR;
  37
  38#define PHYSADDR(x) x
  39
  40#define LINUX_MAX_ENVS          256
  41#define LINUX_MAX_ARGS          256
  42
  43static ulong get_sp (void);
  44static void set_clocks_in_mhz (bd_t *kbd);
  45
  46void arch_lmb_reserve(struct lmb *lmb)
  47{
  48        ulong sp;
  49
  50        /*
  51         * Booting a (Linux) kernel image
  52         *
  53         * Allocate space for command line and board info - the
  54         * address should be as high as possible within the reach of
  55         * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  56         * memory, which means far enough below the current stack
  57         * pointer.
  58         */
  59        sp = get_sp();
  60        debug ("## Current stack ends at 0x%08lx ", sp);
  61
  62        /* adjust sp by 1K to be safe */
  63        sp -= 1024;
  64        lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
  65}
  66
  67int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
  68{
  69        ulong rd_len;
  70        ulong initrd_start, initrd_end;
  71        int ret;
  72
  73        ulong cmd_start, cmd_end;
  74        ulong bootmap_base;
  75        bd_t  *kbd;
  76        void  (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
  77        struct lmb *lmb = &images->lmb;
  78
  79        if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  80                return 1;
  81
  82        bootmap_base = getenv_bootm_low();
  83
  84        /* allocate space and init command line */
  85        ret = boot_get_cmdline (lmb, &cmd_start, &cmd_end, bootmap_base);
  86        if (ret) {
  87                puts("ERROR with allocation of cmdline\n");
  88                goto error;
  89        }
  90
  91        /* allocate space for kernel copy of board info */
  92        ret = boot_get_kbd (lmb, &kbd, bootmap_base);
  93        if (ret) {
  94                puts("ERROR with allocation of kernel bd\n");
  95                goto error;
  96        }
  97        set_clocks_in_mhz(kbd);
  98
  99        kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))images->ep;
 100
 101        rd_len = images->rd_end - images->rd_start;
 102        ret = boot_ramdisk_high (lmb, images->rd_start, rd_len,
 103                        &initrd_start, &initrd_end);
 104        if (ret)
 105                goto error;
 106
 107        debug("## Transferring control to Linux (at address %08lx) ...\n",
 108              (ulong) kernel);
 109
 110        show_boot_progress (15);
 111
 112        /*
 113         * Linux Kernel Parameters (passing board info data):
 114         *   sp+00: Ignore, side effect of using jsr to jump to kernel
 115         *   sp+04: ptr to board info data
 116         *   sp+08: initrd_start or 0 if no initrd
 117         *   sp+12: initrd_end - unused if initrd_start is 0
 118         *   sp+16: Start of command line string
 119         *   sp+20: End   of command line string
 120         */
 121        (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
 122        /* does not return */
 123error:
 124        return 1;
 125}
 126
 127static ulong get_sp (void)
 128{
 129        ulong sp;
 130
 131        asm("movel %%a7, %%d0\n"
 132            "movel %%d0, %0\n": "=d"(sp): :"%d0");
 133
 134        return sp;
 135}
 136
 137static void set_clocks_in_mhz (bd_t *kbd)
 138{
 139        char *s;
 140
 141        if ((s = getenv("clocks_in_mhz")) != NULL) {
 142                /* convert all clock information to MHz */
 143                kbd->bi_intfreq /= 1000000L;
 144                kbd->bi_busfreq /= 1000000L;
 145        }
 146}
 147