Initial revision

1 files changed, 324 insertions, 0 deletions

diff --git a/lib_arm/armlinux.c b/lib_arm/armlinux.c
new file mode 100644
index 0000000..e5b8faa
--- /dev/null
+++ 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 */