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
  36 DECLARE_GLOBAL_DATA_PTR;
  37
  38 #define PHYSADDR(x) x
  39
  40 #define LINUX_MAX_ENVS          256
  41 #define LINUX_MAX_ARGS          256
  42
  43 static ulong get_sp (void);
  44 static void set_clocks_in_mhz (bd_t *kbd);
  45
  46 void 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
  67 int 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 */
 123 error:
 124         return 1;
 125 }
 126
 127 static 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
 137 static 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 }