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-rw-r--r--lib_m68k/bootm.c279
1 files changed, 279 insertions, 0 deletions
diff --git a/lib_m68k/bootm.c b/lib_m68k/bootm.c
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--- /dev/null
+++ b/lib_m68k/bootm.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 <watchdog.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
+
+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[],
+ image_header_t *hdr, int verify)
+{
+ ulong sp;
+
+ ulong rd_data, rd_len;
+ ulong initrd_high;
+ ulong initrd_start, initrd_end;
+ image_header_t *rd_hdr;
+ int initrd_copy_to_ram = 1;
+
+ ulong cmd_start, cmd_end;
+ char *cmdline;
+ char *s;
+ bd_t *kbd;
+ void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
+
+ 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))image_get_ep (hdr);
+
+ /*
+ * Check if there is an initrd image
+ */
+
+ if (argc >= 3) {
+ debug("Not skipping initrd\n");
+ SHOW_BOOT_PROGRESS(9);
+
+ rd_hdr = (image_header_t *)simple_strtoul (argv[2], NULL, 16);
+ printf ("## Loading RAMDisk Image at %08lx ...\n", rd_hdr);
+
+ if (!image_check_magic (rd_hdr)) {
+ puts("Bad Magic Number\n");
+ SHOW_BOOT_PROGRESS(-10);
+ do_reset(cmdtp, flag, argc, argv);
+ }
+
+ if (!image_check_hcrc (rd_hdr)) {
+ puts("Bad Header Checksum\n");
+ SHOW_BOOT_PROGRESS(-11);
+ do_reset(cmdtp, flag, argc, argv);
+ }
+
+ SHOW_BOOT_PROGRESS(10);
+
+ print_image_hdr (rd_hdr);
+
+ rd_data = image_get_data (rd_hdr);
+ rd_len = image_get_data_size (rd_hdr);
+
+ if (verify) {
+ puts(" Verifying Checksum ... ");
+ if (!image_check_dcrc_wd (rd_hdr, CHUNKSZ)) {
+ puts("Bad Data CRC\n");
+ SHOW_BOOT_PROGRESS(-12);
+ do_reset(cmdtp, flag, argc, argv);
+ }
+ puts("OK\n");
+ }
+
+ SHOW_BOOT_PROGRESS(11);
+
+ if (!image_check_os (rd_hdr, IH_OS_LINUX) ||
+ !image_check_arch (rd_hdr, IH_ARCH_M68K) ||
+ !image_check_type (rd_hdr, 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 (image_check_type (hdr, IH_TYPE_MULTI)) {
+ /*
+ * Get second entry data start address and len
+ */
+ SHOW_BOOT_PROGRESS (13);
+ image_multi_getimg (hdr, 1, &rd_data, &rd_len);
+ } else {
+ /*
+ * no initrd image
+ */
+ SHOW_BOOT_PROGRESS(14);
+
+ rd_len = rd_data = 0;
+ }
+
+ if (!rd_data) {
+ debug("No initrd\n");
+ }
+
+ if (rd_data) {
+ if (!initrd_copy_to_ram) { /* zero-copy ramdisk support */
+ initrd_start = rd_data;
+ initrd_end = initrd_start + rd_len;
+ } else {
+ initrd_start = (ulong) kbd - rd_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 -= rd_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",
+ rd_data, rd_data + rd_len - 1, rd_len, rd_len);
+
+ initrd_end = initrd_start + rd_len;
+ printf(" Loading Ramdisk to %08lx, end %08lx ... ",
+ initrd_start, initrd_end);
+
+ memmove_wd((void *)initrd_start,
+ (void *)rd_data, rd_len, CHUNKSZ);
+
+ 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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