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u-boot/lib_m68k/m68k_linux.c

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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 <environment.h>
#include <asm/byteorder.h>
DECLARE_GLOBAL_DATA_PTR;
#define PHYSADDR(x) x
#define LINUX_MAX_ENVS 256
#define LINUX_MAX_ARGS 256
#ifdef CONFIG_SHOW_BOOT_PROGRESS
# include <status_led.h>
# define SHOW_BOOT_PROGRESS(arg) show_boot_progress(arg)
#else
# define SHOW_BOOT_PROGRESS(arg)
#endif
extern image_header_t header;
void do_bootm_linux(cmd_tbl_t * cmdtp, int flag,
int argc, char *argv[],
ulong addr, ulong * len_ptr, int verify)
{
ulong sp;
ulong len, checksum;
ulong initrd_start, initrd_end;
ulong cmd_start, cmd_end;
ulong initrd_high;
ulong data;
int initrd_copy_to_ram = 1;
char *cmdline;
char *s;
bd_t *kbd;
void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
image_header_t *hdr = &header;
if ((s = getenv("initrd_high")) != NULL) {
/* a value of "no" or a similar string will act like 0,
* turning the "load high" feature off. This is intentional.
*/
initrd_high = simple_strtoul(s, NULL, 16);
if (initrd_high == ~0)
initrd_copy_to_ram = 0;
} else { /* not set, no restrictions to load high */
initrd_high = ~0;
}
#ifdef CONFIG_LOGBUFFER
kbd = gd->bd;
/* Prevent initrd from overwriting logbuffer */
if (initrd_high < (kbd->bi_memsize - LOGBUFF_LEN - LOGBUFF_OVERHEAD))
initrd_high = kbd->bi_memsize - LOGBUFF_LEN - LOGBUFF_OVERHEAD;
debug("## Logbuffer at 0x%08lX ", kbd->bi_memsize - LOGBUFF_LEN);
#endif
/*
* 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.
*/
asm("movel %%a7, %%d0\n"
"movel %%d0, %0\n": "=d"(sp): :"%d0");
debug("## Current stack ends at 0x%08lX ", sp);
sp -= 2048; /* just to be sure */
if (sp > CFG_BOOTMAPSZ)
sp = CFG_BOOTMAPSZ;
sp &= ~0xF;
debug("=> set upper limit to 0x%08lX\n", sp);
cmdline = (char *)((sp - CFG_BARGSIZE) & ~0xF);
kbd = (bd_t *) (((ulong) cmdline - sizeof(bd_t)) & ~0xF);
if ((s = getenv("bootargs")) == NULL)
s = "";
strcpy(cmdline, s);
cmd_start = (ulong) & cmdline[0];
cmd_end = cmd_start + strlen(cmdline);
*kbd = *(gd->bd);
#ifdef DEBUG
printf("## cmdline at 0x%08lX ... 0x%08lX\n", cmd_start, cmd_end);
do_bdinfo(NULL, 0, 0, NULL);
#endif
if ((s = getenv("clocks_in_mhz")) != NULL) {
/* convert all clock information to MHz */
kbd->bi_intfreq /= 1000000L;
kbd->bi_busfreq /= 1000000L;
}
kernel =
(void (*)(bd_t *, ulong, ulong, ulong, ulong))ntohl(hdr->ih_ep);
/*
* Check if there is an initrd image
*/
if (argc >= 3) {
debug("Not skipping initrd\n");
SHOW_BOOT_PROGRESS(9);
addr = simple_strtoul(argv[2], NULL, 16);
printf("## Loading RAMDisk Image at %08lx ...\n", addr);
/* Copy header so we can blank CRC field for re-calculation */
memmove(&header, (char *)addr, sizeof(image_header_t));
if (ntohl(hdr->ih_magic) != IH_MAGIC) {
puts("Bad Magic Number\n");
SHOW_BOOT_PROGRESS(-10);
do_reset(cmdtp, flag, argc, argv);
}
data = (ulong) & header;
len = sizeof(image_header_t);
checksum = ntohl(hdr->ih_hcrc);
hdr->ih_hcrc = 0;
if (crc32(0, (uchar *) data, len) != checksum) {
puts("Bad Header Checksum\n");
SHOW_BOOT_PROGRESS(-11);
do_reset(cmdtp, flag, argc, argv);
}
SHOW_BOOT_PROGRESS(10);
print_image_hdr(hdr);
data = addr + sizeof(image_header_t);
len = ntohl(hdr->ih_size);
if (verify) {
ulong csum = 0;
#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
ulong cdata = data, edata = cdata + len;
#endif /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
puts(" Verifying Checksum ... ");
#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
while (cdata < edata) {
ulong chunk = edata - cdata;
if (chunk > CHUNKSZ)
chunk = CHUNKSZ;
csum = crc32(csum, (uchar *) cdata, chunk);
cdata += chunk;
WATCHDOG_RESET();
}
#else /* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
csum = crc32(0, (uchar *) data, len);
#endif /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
if (csum != ntohl(hdr->ih_dcrc)) {
puts("Bad Data CRC\n");
SHOW_BOOT_PROGRESS(-12);
do_reset(cmdtp, flag, argc, argv);
}
puts("OK\n");
}
SHOW_BOOT_PROGRESS(11);
if ((hdr->ih_os != IH_OS_LINUX) ||
(hdr->ih_arch != IH_CPU_M68K) ||
(hdr->ih_type != IH_TYPE_RAMDISK)) {
puts("No Linux ColdFire Ramdisk Image\n");
SHOW_BOOT_PROGRESS(-13);
do_reset(cmdtp, flag, argc, argv);
}
/*
* Now check if we have a multifile image
*/
} else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
u_long tail = ntohl(len_ptr[0]) % 4;
int i;
SHOW_BOOT_PROGRESS(13);
/* skip kernel length and terminator */
data = (ulong) (&len_ptr[2]);
/* skip any additional image length fields */
for (i = 1; len_ptr[i]; ++i)
data += 4;
/* add kernel length, and align */
data += ntohl(len_ptr[0]);
if (tail) {
data += 4 - tail;
}
len = ntohl(len_ptr[1]);
} else {
/*
* no initrd image
*/
SHOW_BOOT_PROGRESS(14);
len = data = 0;
}
if (!data) {
debug("No initrd\n");
}
if (data) {
if (!initrd_copy_to_ram) { /* zero-copy ramdisk support */
initrd_start = data;
initrd_end = initrd_start + len;
} else {
initrd_start = (ulong) kbd - len;
initrd_start &= ~(4096 - 1); /* align on page */
if (initrd_high) {
ulong nsp;
/*
* the inital ramdisk does not need to be within
* CFG_BOOTMAPSZ as it is not accessed until after
* the mm system is initialised.
*
* do the stack bottom calculation again and see if
* the initrd will fit just below the monitor stack
* bottom without overwriting the area allocated
* above for command line args and board info.
*/
asm("movel %%a7, %%d0\n"
"movel %%d0, %0\n": "=d"(nsp): :"%d0");
nsp -= 2048; /* just to be sure */
nsp &= ~0xF;
if (nsp > initrd_high) /* limit as specified */
nsp = initrd_high;
nsp -= len;
nsp &= ~(4096 - 1); /* align on page */
if (nsp >= sp)
initrd_start = nsp;
}
SHOW_BOOT_PROGRESS(12);
debug
("## initrd at 0x%08lX ... 0x%08lX (len=%ld=0x%lX)\n",
data, data + len - 1, len, len);
initrd_end = initrd_start + len;
printf(" Loading Ramdisk to %08lx, end %08lx ... ",
initrd_start, initrd_end);
#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
{
size_t l = len;
void *to = (void *)initrd_start;
void *from = (void *)data;
while (l > 0) {
size_t tail =
(l > CHUNKSZ) ? CHUNKSZ : l;
WATCHDOG_RESET();
memmove(to, from, tail);
to += tail;
from += tail;
l -= tail;
}
}
#else /* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
memmove((void *)initrd_start, (void *)data, len);
#endif /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
puts("OK\n");
}
} else {
initrd_start = 0;
initrd_end = 0;
}
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 */
}
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