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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
    
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     * 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
    
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     * 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 <environment.h>
    
    #include <asm/byteorder.h>
    
    #ifdef CONFIG_SHOW_BOOT_PROGRESS
    # include <status_led.h>
    #endif
    
    #define PHYSADDR(x) x
    
    
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    #define LINUX_MAX_ENVS		256
    #define LINUX_MAX_ARGS		256
    
    static ulong get_sp (void);
    
    static void set_clocks_in_mhz (bd_t *kbd);
    
    int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
    
    	ulong rd_len;
    
    	ulong initrd_start, initrd_end;
    
    	bd_t  *kbd;
    	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;
    	}
    
    	kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))images->ep;
    
    	rd_len = images->rd_end - images->rd_start;
    	ret = boot_ramdisk_high (lmb, images->rd_start, rd_len,
    
    	if (ret)
    		goto error;
    
    	debug("## Transferring control to Linux (at address %08lx) ...\n",
    	      (ulong) kernel);
    
    	/*
    	 * 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 */
    
    
    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;
    	}
    }