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/*
* (C) Copyright 2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <common.h>
#include <command.h>
#include <image.h>
#include <zlib.h>
#include <bzlib.h>
#include <watchdog.h>
#include <environment.h>
#include <asm/byteorder.h>
#ifdef CONFIG_SHOW_BOOT_PROGRESS
# include <status_led.h>
#endif
DECLARE_GLOBAL_DATA_PTR;
extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
#define PHYSADDR(x) x
#define LINUX_MAX_ENVS 256
#define LINUX_MAX_ARGS 256
static ulong get_sp (void);
static void set_clocks_in_mhz (bd_t *kbd);
extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
void do_bootm_linux(cmd_tbl_t * cmdtp, int flag,
int argc, char *argv[],
bootm_headers_t *images)
{
ulong sp, sp_limit, alloc_current;
ulong rd_data_start, rd_data_end, rd_len;
ulong initrd_start, initrd_end;
int ret;
ulong cmd_start, cmd_end;
bd_t *kbd;
ulong ep = 0;
void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
/*
* Booting a (Linux) kernel image
*
* Allocate space for command line and board info - the
* address should be as high as possible within the reach of
* the kernel (see CFG_BOOTMAPSZ settings), but in unused
* memory, which means far enough below the current stack
* pointer.
*/
sp = get_sp();
debug ("## Current stack ends at 0x%08lx ", sp);
alloc_current = sp_limit = get_boot_sp_limit(sp);
debug ("=> set upper limit to 0x%08lx\n", sp_limit);
/* allocate space and init command line */
alloc_current = get_boot_cmdline (alloc_current, &cmd_start, &cmd_end);
/* allocate space for kernel copy of board info */
alloc_current = get_boot_kbd (alloc_current, &kbd);
set_clocks_in_mhz(kbd);
/* find kernel entry point */
if (images->legacy_hdr_valid) {
ep = image_get_ep (images->legacy_hdr_os);
#if defined(CONFIG_FIT)
} else if (images->fit_uname_os) {
fit_unsupported_reset ("M68K linux bootm");
do_reset (cmdtp, flag, argc, argv);
#endif
} else {
puts ("Could not find kernel entry point!\n");
do_reset (cmdtp, flag, argc, argv);
}
kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))ep;
/* find ramdisk */
ret = get_ramdisk (cmdtp, flag, argc, argv, images,
IH_ARCH_M68K, &rd_data_start, &rd_data_end);
if (ret)
goto error;
rd_len = rd_data_end - rd_data_start;
alloc_current = ramdisk_high (alloc_current, rd_data_start, rd_len,
sp_limit, get_sp (), &initrd_start, &initrd_end);
debug("## Transferring control to Linux (at address %08lx) ...\n",
(ulong) kernel);
show_boot_progress (15);
/*
* Linux Kernel Parameters (passing board info data):
* r3: ptr to board info data
* r4: initrd_start or 0 if no initrd
* r5: initrd_end - unused if r4 is 0
* r6: Start of command line string
* r7: End of command line string
*/
(*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
/* does not return */
return ;
error:
do_reset (cmdtp, flag, argc, argv);
return ;
}
static ulong get_sp (void)
{
ulong sp;
asm("movel %%a7, %%d0\n"
"movel %%d0, %0\n": "=d"(sp): :"%d0");
return sp;
}
static void set_clocks_in_mhz (bd_t *kbd)
{
char *s;
if ((s = getenv("clocks_in_mhz")) != NULL) {
/* convert all clock information to MHz */
kbd->bi_intfreq /= 1000000L;
kbd->bi_busfreq /= 1000000L;
}
}
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