mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-13 14:53:06 +00:00
340 lines
8.3 KiB
C
340 lines
8.3 KiB
C
/*
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* (C) Copyright 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <command.h>
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#include <image.h>
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#include <zlib.h>
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#include <bzlib.h>
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#include <watchdog.h>
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#include <environment.h>
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#include <asm/byteorder.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define PHYSADDR(x) x
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#define LINUX_MAX_ENVS 256
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#define LINUX_MAX_ARGS 256
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#define CHUNKSZ (64 * 1024)
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#ifdef CONFIG_SHOW_BOOT_PROGRESS
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# include <status_led.h>
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# define SHOW_BOOT_PROGRESS(arg) show_boot_progress(arg)
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#else
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# define SHOW_BOOT_PROGRESS(arg)
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#endif
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extern image_header_t header;
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void do_bootm_linux(cmd_tbl_t * cmdtp, int flag,
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int argc, char *argv[],
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ulong addr, ulong * len_ptr, int verify)
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{
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ulong sp;
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ulong len, checksum;
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ulong initrd_start, initrd_end;
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ulong cmd_start, cmd_end;
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ulong initrd_high;
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ulong data;
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int initrd_copy_to_ram = 1;
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char *cmdline;
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char *s;
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bd_t *kbd;
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void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
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image_header_t *hdr = &header;
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if ((s = getenv("initrd_high")) != NULL) {
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/* a value of "no" or a similar string will act like 0,
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* turning the "load high" feature off. This is intentional.
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*/
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initrd_high = simple_strtoul(s, NULL, 16);
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if (initrd_high == ~0)
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initrd_copy_to_ram = 0;
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} else { /* not set, no restrictions to load high */
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initrd_high = ~0;
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}
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#ifdef CONFIG_LOGBUFFER
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kbd = gd->bd;
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/* Prevent initrd from overwriting logbuffer */
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if (initrd_high < (kbd->bi_memsize - LOGBUFF_LEN - LOGBUFF_OVERHEAD))
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initrd_high = kbd->bi_memsize - LOGBUFF_LEN - LOGBUFF_OVERHEAD;
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debug("## Logbuffer at 0x%08lX ", kbd->bi_memsize - LOGBUFF_LEN);
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#endif
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/*
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* Booting a (Linux) kernel image
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*
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* Allocate space for command line and board info - the
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* address should be as high as possible within the reach of
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* the kernel (see CFG_BOOTMAPSZ settings), but in unused
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* memory, which means far enough below the current stack
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* pointer.
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*/
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asm("movel %%a7, %%d0\n"
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"movel %%d0, %0\n": "=d"(sp): :"%d0");
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debug("## Current stack ends at 0x%08lX ", sp);
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sp -= 2048; /* just to be sure */
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if (sp > CFG_BOOTMAPSZ)
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sp = CFG_BOOTMAPSZ;
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sp &= ~0xF;
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debug("=> set upper limit to 0x%08lX\n", sp);
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cmdline = (char *)((sp - CFG_BARGSIZE) & ~0xF);
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kbd = (bd_t *) (((ulong) cmdline - sizeof(bd_t)) & ~0xF);
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if ((s = getenv("bootargs")) == NULL)
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s = "";
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strcpy(cmdline, s);
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cmd_start = (ulong) & cmdline[0];
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cmd_end = cmd_start + strlen(cmdline);
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*kbd = *(gd->bd);
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#ifdef DEBUG
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printf("## cmdline at 0x%08lX ... 0x%08lX\n", cmd_start, cmd_end);
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do_bdinfo(NULL, 0, 0, NULL);
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#endif
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if ((s = getenv("clocks_in_mhz")) != NULL) {
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/* convert all clock information to MHz */
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kbd->bi_intfreq /= 1000000L;
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kbd->bi_busfreq /= 1000000L;
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}
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kernel =
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(void (*)(bd_t *, ulong, ulong, ulong, ulong))ntohl(hdr->ih_ep);
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/*
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* Check if there is an initrd image
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*/
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if (argc >= 3) {
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debug("Not skipping initrd\n");
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SHOW_BOOT_PROGRESS(9);
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addr = simple_strtoul(argv[2], NULL, 16);
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printf("## Loading RAMDisk Image at %08lx ...\n", addr);
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/* Copy header so we can blank CRC field for re-calculation */
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memmove(&header, (char *)addr, sizeof(image_header_t));
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if (ntohl(hdr->ih_magic) != IH_MAGIC) {
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puts("Bad Magic Number\n");
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SHOW_BOOT_PROGRESS(-10);
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do_reset(cmdtp, flag, argc, argv);
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}
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data = (ulong) & header;
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len = sizeof(image_header_t);
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checksum = ntohl(hdr->ih_hcrc);
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hdr->ih_hcrc = 0;
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if (crc32(0, (uchar *) data, len) != checksum) {
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puts("Bad Header Checksum\n");
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SHOW_BOOT_PROGRESS(-11);
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do_reset(cmdtp, flag, argc, argv);
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}
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SHOW_BOOT_PROGRESS(10);
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print_image_hdr(hdr);
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data = addr + sizeof(image_header_t);
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len = ntohl(hdr->ih_size);
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if (verify) {
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ulong csum = 0;
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#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
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ulong cdata = data, edata = cdata + len;
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#endif /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
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puts(" Verifying Checksum ... ");
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#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
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while (cdata < edata) {
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ulong chunk = edata - cdata;
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if (chunk > CHUNKSZ)
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chunk = CHUNKSZ;
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csum = crc32(csum, (uchar *) cdata, chunk);
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cdata += chunk;
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WATCHDOG_RESET();
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}
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#else /* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
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csum = crc32(0, (uchar *) data, len);
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#endif /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
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if (csum != ntohl(hdr->ih_dcrc)) {
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puts("Bad Data CRC\n");
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SHOW_BOOT_PROGRESS(-12);
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do_reset(cmdtp, flag, argc, argv);
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}
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puts("OK\n");
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}
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SHOW_BOOT_PROGRESS(11);
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if ((hdr->ih_os != IH_OS_LINUX) ||
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(hdr->ih_arch != IH_CPU_M68K) ||
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(hdr->ih_type != IH_TYPE_RAMDISK)) {
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puts("No Linux ColdFire Ramdisk Image\n");
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SHOW_BOOT_PROGRESS(-13);
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do_reset(cmdtp, flag, argc, argv);
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}
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/*
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* Now check if we have a multifile image
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*/
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} else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
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u_long tail = ntohl(len_ptr[0]) % 4;
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int i;
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SHOW_BOOT_PROGRESS(13);
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/* skip kernel length and terminator */
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data = (ulong) (&len_ptr[2]);
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/* skip any additional image length fields */
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for (i = 1; len_ptr[i]; ++i)
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data += 4;
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/* add kernel length, and align */
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data += ntohl(len_ptr[0]);
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if (tail) {
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data += 4 - tail;
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}
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len = ntohl(len_ptr[1]);
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} else {
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/*
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* no initrd image
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*/
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SHOW_BOOT_PROGRESS(14);
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len = data = 0;
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}
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if (!data) {
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debug("No initrd\n");
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}
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if (data) {
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if (!initrd_copy_to_ram) { /* zero-copy ramdisk support */
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initrd_start = data;
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initrd_end = initrd_start + len;
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} else {
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initrd_start = (ulong) kbd - len;
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initrd_start &= ~(4096 - 1); /* align on page */
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if (initrd_high) {
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ulong nsp;
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/*
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* the inital ramdisk does not need to be within
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* CFG_BOOTMAPSZ as it is not accessed until after
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* the mm system is initialised.
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*
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* do the stack bottom calculation again and see if
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* the initrd will fit just below the monitor stack
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* bottom without overwriting the area allocated
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* above for command line args and board info.
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*/
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asm("movel %%a7, %%d0\n"
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"movel %%d0, %0\n": "=d"(nsp): :"%d0");
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nsp -= 2048; /* just to be sure */
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nsp &= ~0xF;
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if (nsp > initrd_high) /* limit as specified */
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nsp = initrd_high;
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nsp -= len;
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nsp &= ~(4096 - 1); /* align on page */
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if (nsp >= sp)
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initrd_start = nsp;
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}
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SHOW_BOOT_PROGRESS(12);
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debug
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("## initrd at 0x%08lX ... 0x%08lX (len=%ld=0x%lX)\n",
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data, data + len - 1, len, len);
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initrd_end = initrd_start + len;
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printf(" Loading Ramdisk to %08lx, end %08lx ... ",
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initrd_start, initrd_end);
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#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
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{
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size_t l = len;
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void *to = (void *)initrd_start;
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void *from = (void *)data;
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while (l > 0) {
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size_t tail =
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(l > CHUNKSZ) ? CHUNKSZ : l;
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WATCHDOG_RESET();
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memmove(to, from, tail);
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to += tail;
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from += tail;
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l -= tail;
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}
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}
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#else /* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
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memmove((void *)initrd_start, (void *)data, len);
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#endif /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
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puts("OK\n");
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}
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} else {
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initrd_start = 0;
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initrd_end = 0;
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}
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debug("## Transferring control to Linux (at address %08lx) ...\n",
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(ulong) kernel);
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SHOW_BOOT_PROGRESS(15);
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/*
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* Linux Kernel Parameters (passing board info data):
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* r3: ptr to board info data
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* r4: initrd_start or 0 if no initrd
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* r5: initrd_end - unused if r4 is 0
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* r6: Start of command line string
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* r7: End of command line string
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*/
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(*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
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/* does not return */
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}
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