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-rw-r--r--lib_m68k/bootm.c171
1 files changed, 171 insertions, 0 deletions
diff --git a/lib_m68k/bootm.c 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>
+#ifdef CONFIG_SHOW_BOOT_PROGRESS
+# include <status_led.h>
+#endif
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#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;
+
+ ulong rd_data_start, rd_data_end, rd_len;
+ ulong initrd_start, initrd_end;
+ int ret;
+
+ ulong cmd_start, cmd_end;
+ ulong bootmap_base;
+ bd_t *kbd;
+ ulong ep = 0;
+ void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
+ struct lmb *lmb = images->lmb;
+
+ bootmap_base = getenv_bootm_low();
+
+ /*
+ * 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);
+
+ /* adjust sp by 1K to be safe */
+ sp -= 1024;
+ lmb_reserve(lmb, sp, (CFG_SDRAM_BASE + gd->ram_size - sp));
+
+ /* allocate space and init command line */
+ ret = boot_get_cmdline (lmb, &cmd_start, &cmd_end, bootmap_base);
+ if (ret) {
+ puts("ERROR with allocation of cmdline\n");
+ goto error;
+ }
+
+ /* allocate space for kernel copy of board info */
+ ret = boot_get_kbd (lmb, &kbd, bootmap_base);
+ if (ret) {
+ puts("ERROR with allocation of kernel bd\n");
+ goto error;
+ }
+ 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) {
+ ret = fit_image_get_entry (images->fit_hdr_os,
+ images->fit_noffset_os, &ep);
+ if (ret) {
+ puts ("Can't get entry point property!\n");
+ goto error;
+ }
+#endif
+ } else {
+ puts ("Could not find kernel entry point!\n");
+ goto error;
+ }
+ kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))ep;
+
+ /* find ramdisk */
+ ret = boot_get_ramdisk (argc, argv, images, IH_ARCH_M68K,
+ &rd_data_start, &rd_data_end);
+ if (ret)
+ goto error;
+
+ rd_len = rd_data_end - rd_data_start;
+ ret = boot_ramdisk_high (lmb, rd_data_start, rd_len,
+ &initrd_start, &initrd_end);
+ if (ret)
+ goto error;
+
+ debug("## Transferring control to Linux (at address %08lx) ...\n",
+ (ulong) kernel);
+
+ show_boot_progress (15);
+
+ if (!images->autostart)
+ return;
+ /*
+ * 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:
+ if (images->autostart)
+ 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;
+ }
+}