arch/m68k/lib/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 * const 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         bd_t  *kbd;
  75         void  (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
  76         struct lmb *lmb = &images->lmb;
  77
  78         /*
  79          * allow the PREP bootm subcommand, it is required for bootm to work
  80          */
  81         if (flag & BOOTM_STATE_OS_PREP)
  82                 return 0;
  83
  84         if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  85                 return 1;
  86
  87         /* allocate space for kernel copy of board info */
  88         ret = boot_get_kbd (lmb, &kbd);
  89         if (ret) {
  90                 puts("ERROR with allocation of kernel bd\n");
  91                 goto error;
  92         }
  93         set_clocks_in_mhz(kbd);
  94
  95         ret = image_setup_linux(images);
  96         if (ret)
  97                 goto error;
  98
  99         kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))images->ep;
 100
 101         debug("## Transferring control to Linux (at address %08lx) ...\n",
 102               (ulong) kernel);
 103
 104         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 105
 106         /*
 107          * Linux Kernel Parameters (passing board info data):
 108          *   sp+00: Ignore, side effect of using jsr to jump to kernel
 109          *   sp+04: ptr to board info data
 110          *   sp+08: initrd_start or 0 if no initrd
 111          *   sp+12: initrd_end - unused if initrd_start is 0
 112          *   sp+16: Start of command line string
 113          *   sp+20: End   of command line string
 114          */
 115         (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
 116         /* does not return */
 117 error:
 118         return 1;
 119 }
 120
 121 static ulong get_sp (void)
 122 {
 123         ulong sp;
 124
 125         asm("movel %%a7, %%d0\n"
 126             "movel %%d0, %0\n": "=d"(sp): :"%d0");
 127
 128         return sp;
 129 }
 130
 131 static void set_clocks_in_mhz (bd_t *kbd)
 132 {
 133         char *s;
 134
 135         if ((s = getenv("clocks_in_mhz")) != NULL) {
 136                 /* convert all clock information to MHz */
 137                 kbd->bi_intfreq /= 1000000L;
 138                 kbd->bi_busfreq /= 1000000L;
 139         }
 140 }