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-rw-r--r--lib_mips/mips_linux.c276
1 files changed, 276 insertions, 0 deletions
diff --git a/lib_mips/mips_linux.c b/lib_mips/mips_linux.c
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index 0000000..e73d4d8
--- /dev/null
+++ b/lib_mips/mips_linux.c
@@ -0,0 +1,276 @@
+/*
+ * (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 <cmd_boot.h>
+#include <image.h>
+#include <zlib.h>
+#include <asm/byteorder.h>
+#include <asm/addrspace.h>
+
+#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; /* from cmd_bootm.c */
+
+static int linux_argc;
+static char ** linux_argv;
+
+static char ** linux_env;
+static char * linux_env_p;
+static int linux_env_idx;
+
+static void linux_params_init (ulong start, char * commandline);
+static void linux_env_set (char * env_name, char * env_val);
+
+
+void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
+ ulong addr, ulong *len_ptr, int verify)
+{
+ DECLARE_GLOBAL_DATA_PTR;
+
+ ulong len = 0, checksum;
+ ulong initrd_start, initrd_end;
+ ulong data;
+ void (*theKernel)(int, char **, char **, int *);
+ image_header_t *hdr = &header;
+ char *commandline = getenv("bootargs");
+ char env_buf[12];
+
+ theKernel = (void (*)(int, char **, char **, int *))ntohl(hdr->ih_ep);
+
+ /*
+ * Check if there is an initrd image
+ */
+ if (argc >= 3) {
+ 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 */
+ memcpy (&header, (char *)addr, sizeof(image_header_t));
+
+ if (ntohl(hdr->ih_magic) != IH_MAGIC) {
+ printf ("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, (char *)data, len) != checksum) {
+ printf ("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;
+
+ printf (" Verifying Checksum ... ");
+ csum = crc32 (0, (char *)data, len);
+ if (csum != ntohl(hdr->ih_dcrc)) {
+ printf ("Bad Data CRC\n");
+ SHOW_BOOT_PROGRESS (-12);
+ do_reset (cmdtp, flag, argc, argv);
+ }
+ printf ("OK\n");
+ }
+
+ SHOW_BOOT_PROGRESS (11);
+
+ if ((hdr->ih_os != IH_OS_LINUX) ||
+ (hdr->ih_arch != IH_CPU_MIPS) ||
+ (hdr->ih_type != IH_TYPE_RAMDISK) ) {
+ printf ("No Linux MIPS 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])) {
+ ulong 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);
+
+ data = 0;
+ }
+
+#ifdef DEBUG
+ if (!data) {
+ printf ("No initrd\n");
+ }
+#endif
+
+ if (data) {
+ initrd_start = data;
+ initrd_end = initrd_start + len;
+ } else {
+ initrd_start = 0;
+ initrd_end = 0;
+ }
+
+ SHOW_BOOT_PROGRESS (15);
+
+#ifdef DEBUG
+ printf ("## Transferring control to Linux (at address %08lx) ...\n",
+ (ulong)theKernel);
+#endif
+
+ linux_params_init (PHYSADDR(gd->bd->bi_boot_params), commandline);
+
+ sprintf (env_buf, "%lu", gd->ram_size >> 20);
+ linux_env_set ("memsize", env_buf);
+
+ sprintf (env_buf, "0x%08X", (uint)PHYSADDR(initrd_start));
+ linux_env_set ("initrd_start", env_buf);
+
+ sprintf (env_buf, "0x%X", (uint)(initrd_end - initrd_start));
+ linux_env_set ("initrd_size", env_buf);
+
+ sprintf (env_buf, "0x%08X", (uint)(gd->bd->bi_flashstart));
+ linux_env_set ("flash_start", env_buf);
+
+ sprintf (env_buf, "0x%X", (uint)(gd->bd->bi_flashsize));
+ linux_env_set ("flash_size", env_buf);
+
+ /* we assume that the kernel is in place */
+ printf("\nStarting kernel ...\n\n");
+
+ theKernel(linux_argc, linux_argv, linux_env, 0);
+}
+
+static void linux_params_init (ulong start, char * line)
+{
+ char * next, * quote, * argp;
+
+ linux_argc = 1;
+ linux_argv = (char **) start;
+ linux_argv[0] = 0;
+ argp = (char *)(linux_argv + LINUX_MAX_ARGS);
+
+ next = line;
+
+ while (line && *line && linux_argc < LINUX_MAX_ARGS)
+ {
+ quote = strchr (line, '"');
+ next = strchr (line, ' ');
+
+ while (next != NULL && quote != NULL && quote < next)
+ {
+ /* we found a left quote before the next blank
+ * now we have to find the matching right quote
+ */
+ next = strchr (quote + 1, '"');
+ if (next != NULL)
+ {
+ quote = strchr (next + 1, '"');
+ next = strchr (next + 1, ' ');
+ }
+ }
+
+ if (next == NULL)
+ {
+ next = line + strlen (line);
+ }
+
+ linux_argv [linux_argc] = argp;
+ memcpy (argp, line, next - line);
+ argp [next - line] = 0;
+
+ argp += next - line + 1;
+ linux_argc ++;
+
+ if (*next) next ++;
+
+ line = next;
+ }
+
+ linux_env = (char **)(((ulong)argp + 15) & ~15);
+ linux_env [0] = 0;
+ linux_env_p = (char *)(linux_env + LINUX_MAX_ENVS);
+ linux_env_idx = 0;
+}
+
+static void linux_env_set (char * env_name, char * env_val)
+{
+ if (linux_env_idx < LINUX_MAX_ENVS - 1)
+ {
+ linux_env [linux_env_idx] = linux_env_p;
+
+ strcpy (linux_env_p, env_name);
+ linux_env_p += strlen (env_name);
+
+ strcpy (linux_env_p, "=");
+ linux_env_p += 1;
+
+ strcpy (linux_env_p, env_val);
+ linux_env_p += strlen (env_val);
+
+ linux_env_p ++;
+ linux_env [++ linux_env_idx] = 0;
+ }
+}
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