/*-
 * main.c --
 *	First-level boot program for Sprite. Takes its arguments
 *	and uses tftp to download the appropriate kernel image.
 *
 * Copyright (c) 1987 by the Regents of the University of California
 *
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies.  The University of California
 * makes no representations about the suitability of this
 * software for any purpose.  It is provided "as is" without
 * express or implied warranty.
 *
 *
 */
#ifndef lint
static char rcsid[] =
"$Header$ SPRITE (Berkeley)";
#endif lint

#include    "boot.h"

#include    "saio.h"
#include    "bootparam.h"

/*-
 *-----------------------------------------------------------------------
 * main --
 *	Main function for downloading stuff.
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *	Begins the booted program.
 *
 *-----------------------------------------------------------------------
 */
main()
{
    register struct bootparam	*bp = *romp->v_bootparam;
    struct saioreq	    req;
    int	    	  	startAddr;
    

    if ((strcmp(bp->bp_name, "vmunix") == 0) || (*bp->bp_name == '\0')) {
	bp->bp_name = "sprite";
    }

    printf ("SpriteBoot: %c%c(%x,%x,%x)%s\n",
	    bp->bp_dev[0], bp->bp_dev[1], bp->bp_ctlr,
	    bp->bp_unit, bp->bp_part, bp->bp_name);

    req.si_ctlr = bp->bp_ctlr;
    req.si_unit = bp->bp_unit;
    req.si_boff = (daddr_t)bp->bp_part;
    req.si_boottab = bp->bp_boottab;
    
    if (devopen(&req)) {      /* Do all the hard work */
	(*romp->v_exit_to_mon)();
    }
    etheropen( &req);
    startAddr = tftpload(&req, bp);
    devclose(&req);
    
    if (startAddr == -1){
	(*romp->v_exit_to_mon)();
    } else {
	/*
	 * Jump to the address returned by tftpload
	 */
	printf("Starting execution at 0x%x\n", startAddr);
	startKernel(startAddr);
	return(startAddr);
    }
}