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-rw-r--r--lib_arm/armlinux.c324
1 files changed, 324 insertions, 0 deletions
diff --git a/lib_arm/armlinux.c b/lib_arm/armlinux.c
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+++ b/lib_arm/armlinux.c
@@ -0,0 +1,324 @@
+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
+ *
+ * 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/setup.h>
+#define tag_size(type) ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
+#define tag_next(t) ((struct tag *)((u32 *)(t) + (t)->hdr.size))
+
+#if defined (CONFIG_SETUP_MEMORY_TAGS) || \
+ defined (CONFIG_CMDLINE_TAG) || \
+ defined (CONFIG_INITRD_TAG) || \
+ defined (CONFIG_VFD)
+static void setup_start_tag(bd_t *bd);
+static void setup_memory_tags(bd_t *bd);
+static void setup_commandline_tag(bd_t *bd, char *commandline);
+#if 0
+static void setup_ramdisk_tag(bd_t *bd);
+#endif
+static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end);
+static void setup_end_tag(bd_t *bd);
+#if defined (CONFIG_VFD)
+static void setup_videolfb_tag(gd_t *gd);
+#endif
+
+
+static struct tag *params;
+#endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
+
+extern image_header_t header; /* from cmd_bootm.c */
+
+
+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 zero, int arch);
+ image_header_t *hdr = &header;
+ bd_t *bd = gd->bd;
+#ifdef CONFIG_CMDLINE_TAG
+ char *commandline = getenv("bootargs");
+#endif
+
+ theKernel = (void (*)(int, int))ntohl(hdr->ih_ep);
+
+ /*
+ * Check if there is an initrd image
+ */
+ if (argc >= 3) {
+ 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");
+ 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");
+ do_reset (cmdtp, flag, argc, argv);
+ }
+
+ 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");
+ do_reset (cmdtp, flag, argc, argv);
+ }
+ printf ("OK\n");
+ }
+
+ if ((hdr->ih_os != IH_OS_LINUX) ||
+ (hdr->ih_arch != IH_CPU_ARM) ||
+ (hdr->ih_type != IH_TYPE_RAMDISK) ) {
+ printf ("No Linux ARM Ramdisk Image\n");
+ 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;
+
+ /* 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
+ */
+ 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;
+ }
+
+#ifdef DEBUG
+ printf ("## Transferring control to Linux (at address %08lx) ...\n",
+ (ulong)theKernel);
+#endif
+
+#if defined (CONFIG_SETUP_MEMORY_TAGS) || \
+ defined (CONFIG_CMDLINE_TAG) || \
+ defined (CONFIG_INITRD_TAG) || \
+ defined (CONFIG_VFD)
+ setup_start_tag(bd);
+#ifdef CONFIG_SETUP_MEMORY_TAGS
+ setup_memory_tags(bd);
+#endif
+#ifdef CONFIG_CMDLINE_TAG
+ setup_commandline_tag(bd, commandline);
+#endif
+#ifdef CONFIG_INITRD_TAG
+ setup_initrd_tag(bd, initrd_start, initrd_end);
+#endif
+#if 0
+ setup_ramdisk_tag(bd);
+#endif
+#if defined (CONFIG_VFD)
+ setup_videolfb_tag(gd);
+#endif
+ setup_end_tag(bd);
+#endif
+
+ /* we assume that the kernel is in place */
+ printf("\nStarting kernel ...\n\n");
+
+ cleanup_before_linux();
+
+ theKernel(0, bd->bi_arch_number);
+}
+
+
+#if defined (CONFIG_SETUP_MEMORY_TAGS) || \
+ defined (CONFIG_CMDLINE_TAG) || \
+ defined (CONFIG_INITRD_TAG) || \
+ defined (CONFIG_VFD)
+static void setup_start_tag(bd_t *bd)
+{
+ params = (struct tag *)bd->bi_boot_params;
+
+ params->hdr.tag = ATAG_CORE;
+ params->hdr.size = tag_size(tag_core);
+
+ params->u.core.flags = 0;
+ params->u.core.pagesize = 0;
+ params->u.core.rootdev = 0;
+
+ params = tag_next(params);
+}
+
+
+static void setup_memory_tags(bd_t *bd)
+{
+ int i;
+
+ for(i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+ params->hdr.tag = ATAG_MEM;
+ params->hdr.size = tag_size(tag_mem32);
+
+ params->u.mem.start = bd->bi_dram[i].start;
+ params->u.mem.size = bd->bi_dram[i].size;
+
+ params = tag_next(params);
+ }
+}
+
+
+static void setup_commandline_tag(bd_t *bd, char *commandline)
+{
+ char *p;
+
+ /* eat leading white space */
+ for(p = commandline; *p == ' '; p++)
+ ;
+
+ /* skip non-existent command lines so the kernel will still
+ * use its default command line.
+ */
+ if(*p == '\0')
+ return;
+
+ params->hdr.tag = ATAG_CMDLINE;
+ params->hdr.size = (sizeof(struct tag_header) + strlen(p) + 1 + 4) >> 2;
+
+ strcpy(params->u.cmdline.cmdline, p);
+
+ params = tag_next(params);
+}
+
+
+#ifndef ATAG_INITRD2
+#define ATAG_INITRD2 0x54420005
+#endif
+static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
+{
+ /* an ATAG_INITRD node tells the kernel where the compressed
+ * ramdisk can be found. ATAG_RDIMG is a better name, actually.
+ */
+ params->hdr.tag = ATAG_INITRD2;
+ params->hdr.size = tag_size(tag_initrd);
+
+ params->u.initrd.start = initrd_start;
+ params->u.initrd.size = initrd_end - initrd_start;
+
+ params = tag_next(params);
+}
+
+
+#if 0
+static void setup_ramdisk_tag(bd_t *bd)
+{
+ /* an ATAG_RAMDISK node tells the kernel how large the
+ * decompressed ramdisk will become.
+ */
+ params->hdr.tag = ATAG_RAMDISK;
+ params->hdr.size = tag_size(tag_ramdisk);
+
+ params->u.ramdisk.start = 0;
+ /*params->u.ramdisk.size = RAMDISK_SIZE; */
+ params->u.ramdisk.flags = 1; /* automatically load ramdisk */
+
+ params = tag_next(params);
+}
+#endif /* 0 */
+
+#if defined (CONFIG_VFD)
+static void setup_videolfb_tag(gd_t *gd)
+{
+ /* An ATAG_VIDEOLFB node tells the kernel where and how large
+ * the framebuffer for video was allocated (among other things).
+ * Note that a _physical_ address is passed !
+ *
+ * We only use it to pass the address and size, the other entries
+ * in the tag_videolfb are not of interest.
+ */
+ params->hdr.tag = ATAG_VIDEOLFB;
+ params->hdr.size = tag_size(tag_videolfb);
+
+ params->u.videolfb.lfb_base = (u32)gd->fb_base;
+ /* 7168 = 256*4*56/8 - actually 2 pages (8192 bytes) are allocated */
+ params->u.videolfb.lfb_size = 7168;
+
+ params = tag_next(params);
+}
+#endif
+
+static void setup_end_tag(bd_t *bd)
+{
+ params->hdr.tag = ATAG_NONE;
+ params->hdr.size = 0;
+}
+
+#endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
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