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devopen.c revision 1.4 
      1 /*	$NetBSD: devopen.c,v 1.4 2018/04/02 09:44:18 nonaka Exp $	 */
      2 
      3 /*-
      4  * Copyright (c) 2005 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Bang Jun-Young.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Copyright (c) 1996, 1997
     34  *	Matthias Drochner.  All rights reserved.
     35  *
     36  * Redistribution and use in source and binary forms, with or without
     37  * modification, are permitted provided that the following conditions
     38  * are met:
     39  * 1. Redistributions of source code must retain the above copyright
     40  *    notice, this list of conditions and the following disclaimer.
     41  * 2. Redistributions in binary form must reproduce the above copyright
     42  *    notice, this list of conditions and the following disclaimer in the
     43  *    documentation and/or other materials provided with the distribution.
     44  *
     45  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     46  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     47  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     48  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     49  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     50  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     51  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     52  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     53  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     54  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     55  */
     56 
     57 #include "efiboot.h"
     58 
     59 #include <biosdisk.h>
     60 #include "devopen.h"
     61 #include <bootinfo.h>
     62 #include "efidisk.h"
     63 
     64 static int
     65 dev2bios(char *devname, int unit, int *biosdev)
     66 {
     67 
     68 	if (strcmp(devname, "hd") == 0)
     69 		*biosdev = 0x80 + unit;
     70 	else if (strcmp(devname, "cd") == 0)
     71 		*biosdev = 0x80 + get_harddrives() + unit;
     72 	else
     73 		return ENXIO;
     74 
     75 	return 0;
     76 }
     77 
     78 void
     79 bios2dev(int biosdev, daddr_t sector, char **devname, int *unit, int *partition)
     80 {
     81 
     82 	*unit = biosdev & 0x7f;
     83 
     84 	if (biosdev >= 0x80 + get_harddrives()) {
     85 		*devname = "cd";
     86 		*unit -= get_harddrives();
     87 	} else
     88 		*devname = "hd";
     89 
     90 	*partition = biosdisk_findpartition(biosdev, sector);
     91 }
     92 
     93 struct btinfo_bootpath bibp;
     94 extern bool kernel_loaded;
     95 
     96 /*
     97  * Open the EFI disk device
     98  */
     99 int
    100 devopen(struct open_file *f, const char *fname, char **file)
    101 {
    102 	char *fsname, *devname;
    103 	int unit, partition;
    104 	int biosdev;
    105 	int error;
    106 
    107 	error = parsebootfile(fname, &fsname, &devname, &unit, &partition,
    108 	    (const char **) file);
    109 	if (error)
    110 		return error;
    111 
    112 	if (strcmp(devname, "esp") == 0) {
    113 		bios2dev(boot_biosdev, boot_biossector, &devname, &unit,
    114 		    &partition);
    115 		if (efidisk_get_efi_system_partition(boot_biosdev, &partition))
    116 			return ENXIO;
    117 	}
    118 
    119 	error = dev2bios(devname, unit, &biosdev);
    120 	if (error)
    121 		return error;
    122 
    123 	f->f_dev = &devsw[0];		/* must be biosdisk */
    124 
    125 	if (!kernel_loaded) {
    126 		strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
    127 		BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
    128 	}
    129 
    130 	return biosdisk_open(f, biosdev, partition);
    131 }
    132