/* * (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 "armboot.h"#include "command.h"#include "cmd_boot.h"#include "image.h"#include "malloc.h"#include "zlib.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))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 0static void setup_ramdisk_tag(bd_t *bd);#endifstatic void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end);static void setup_end_tag(bd_t *bd);extern image_header_t header;           /* from cmd_bootm.c */#undef DEBUGstatic struct tag *params;void boot_linux(cmd_tbl_t *cmdtp,		bd_t *bd, int flag,		int argc, char *argv[],		ulong addr,		ulong *len_ptr,		int   verify){    ulong len = 0, checksum;    ulong initrd_start, initrd_end;    ulong data;    char *commandline = getenv(bd, "bootargs");    void (*theKernel)(int zero, int arch);    image_header_t *hdr = &header;    /*     * 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 (SWAP32(hdr->ih_magic) != IH_MAGIC) {	    printf ("Bad Magic Number\n");	    do_reset (cmdtp, bd, flag, argc, argv);	}		data = (ulong)&header;	len  = sizeof(image_header_t);		checksum = SWAP32(hdr->ih_hcrc);	hdr->ih_hcrc = 0;		if (crc32 (0, (char *)data, len) != checksum) {	    printf ("Bad Header Checksum\n");	    do_reset (cmdtp, bd, flag, argc, argv);	}		print_image_hdr (hdr);		data = addr + sizeof(image_header_t);	len  = SWAP32(hdr->ih_size);		if (verify) {	    ulong csum = 0;	    printf ("   Verifying Checksum ... ");	    csum = crc32 (0, (char *)data, len);	    if (csum != SWAP32(hdr->ih_dcrc)) {		printf ("Bad Data CRC\n");		do_reset (cmdtp, bd, 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, bd, flag, argc, argv);	}		/*	 * Now check if we have a multifile image	 */    } else if ((hdr->ih_type==IH_TYPE_MULTI) && (len_ptr[1])) {	ulong tail    = SWAP32(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 += SWAP32(len_ptr[0]);	if (tail) {	    data += 4 - tail;	}		len   = SWAP32(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;	printf ("   Loading Ramdisk to %08lx, end %08lx ... ",		initrd_start, initrd_end);	memmove ((void *)initrd_start, (void *)data, len);	printf ("OK\n");    } else {	initrd_start = 0;	initrd_end = 0;    }        theKernel = (void (*)(int, int))SWAP32(hdr->ih_ep);   #ifdef DEBUG    printf ("## Transferring control to Linux (at address %08lx) ...\n",	    (ulong)theKernel);#endif    setup_start_tag(bd);    setup_memory_tags(bd);    setup_commandline_tag(bd, commandline);    setup_initrd_tag(bd, initrd_start, initrd_end);#if 0    setup_ramdisk_tag(bd);#endif    setup_end_tag(bd);    /* we assume that the kernel is in place */    printf("\nStarting kernel ...\n\n");    cleanup_before_linux(bd);    theKernel(0, bd->bi_arch_number);}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);}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_INITRD;    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 0static 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);}#endifstatic void setup_end_tag(bd_t *bd){    params->hdr.tag = ATAG_NONE;    params->hdr.size = 0;}