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      1 /* $NetBSD: booted_dev.c,v 1.4 2016/10/13 16:18:20 flxd Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1999 Christopher G. Demetriou.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *      This product includes software developed by Christopher G. Demetriou
     17  *	for the NetBSD Project.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #include <lib/libsa/stand.h>
     34 #include <lib/libkern/libkern.h>
     35 
     36 #include <machine/prom.h>
     37 #include "common.h"
     38 
     39 long	booted_dev_fd;
     40 #if defined(PRIMARY_BOOTBLOCK) || defined(UNIFIED_BOOTBLOCK)
     41 char	booted_dev_name[BOOTED_DEV_MAXNAMELEN];
     42 #endif /* defined(PRIMARY_BOOTBLOCK) || defined(UNIFIED_BOOTBLOCK) */
     43 
     44 #if defined(PRIMARY_BOOTBLOCK) || defined(UNIFIED_BOOTBLOCK)
     45 int
     46 booted_dev_open(void)
     47 {
     48 	prom_return_t ret;
     49 	int devlen;
     50 
     51 	/*
     52 	 * XXX
     53 	 * We don't know what device names look like yet,
     54 	 * so we can't change them.
     55 	 */
     56 	devlen = prom_getenv(PROM_E_BOOTED_DEV, booted_dev_name,
     57 	    sizeof(booted_dev_name));
     58 
     59 	ret.bits = prom_open(booted_dev_name, devlen);
     60 
     61 	if (ret.u.status)
     62 		return 0;
     63 	booted_dev_fd = ret.u.retval;
     64 
     65 	return 1;
     66 }
     67 #endif
     68