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      1 /*	$NetBSD: mboot.c,v 1.12 2012/04/06 09:44:44 isaki Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Minoura Makoto.
      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 #include <sys/types.h>
     33 #include <machine/disklabel.h>
     34 
     35 #include "iocs.h"
     36 
     37 int bootmain(int);
     38 
     39 #define PART_BOOTABLE	0
     40 #define PART_UNUSED	1
     41 #define PART_INUSE	2
     42 
     43 int
     44 bootmain(int scsiid)
     45 {
     46 	struct iocs_readcap cap;
     47 	int size;
     48 
     49 	if (IOCS_BITSNS(0) & 1)	/* ESC key */
     50 		return 0;
     51 
     52 	if (IOCS_S_READCAP(scsiid, &cap) < 0) {
     53 		IOCS_B_PRINT(BOOT ": Error in reading.\r\n");
     54 		return 0;
     55 	}
     56 	size = cap.size >> 9;
     57 
     58 	{
     59 		long *label = (void*) 0x3000;
     60 		if (IOCS_S_READ(0, 1, scsiid, size, label) < 0) {
     61 			IOCS_B_PRINT(BOOT ": Error in reading.\r\n");
     62 			return 0;
     63 		}
     64 		if (label[0] != 0x58363853 ||
     65 		    label[1] != 0x43534931) {
     66 			IOCS_B_PRINT(BOOT ": Invalid disk.\r\n");
     67 			return 0;
     68 		}
     69 	}
     70 
     71 	{
     72 		struct cpu_disklabel *label = (void*) 0x3000;
     73 		int i, firstinuse=-1;
     74 		unsigned char *t;
     75 
     76 		if (IOCS_S_READ(2<<(2-size), size?2:1, scsiid, size, label) < 0) {
     77 			IOCS_B_PRINT(BOOT ": Error in reading.\r\n");
     78 			return 0;
     79 		}
     80 		t = label->dosparts[0].dp_typname;
     81 		if (t[0] != 'X' || t[1] != '6' || t[2] != '8' || t[3] != 'K') {
     82 			IOCS_B_PRINT(BOOT ": Invalid disk.\r\n");
     83 			return 0;
     84 		}
     85 
     86 		for (i = 1; i < NDOSPART; i++) {
     87 			if (label->dosparts[i].dp_flag == PART_BOOTABLE)
     88 				break;
     89 			else if (label->dosparts[i].dp_flag == PART_INUSE)
     90 				firstinuse = i;
     91 		}
     92 		if (i >= NDOSPART && firstinuse >= 0)
     93 			i = firstinuse;
     94 		if (i < NDOSPART) {
     95 			unsigned int start = label->dosparts[i].dp_start;
     96 			unsigned int start1 = start << (2-size);
     97 			int r;
     98 			if ((start1 & 0x1fffff) == 0x1fffff)
     99 				r = IOCS_S_READ(start1,
    100 						8>>size,
    101 						scsiid,
    102 						size,
    103 						(void*) 0x2400);
    104 			else
    105 				r = IOCS_S_READEXT(start1,
    106 						   8>>size,
    107 						   scsiid,
    108 						   size,
    109 						   (void*) 0x2400);
    110 			if (r < 0) {
    111 				IOCS_B_PRINT(BOOT ": Error in reading.\r\n");
    112 				return 0;
    113 			}
    114 			if (*((char*) 0x2400) != 0x60) {
    115 				IOCS_B_PRINT(BOOT ": Invalid disk.\r\n");
    116 				return 0;
    117 			}
    118 			__asm volatile ("movl %0,%%d4\n\t"
    119 				      "movl %1,%%d2\n\t"
    120 				      "jsr 0x2400"
    121 				      :
    122 				      : "g" (scsiid), "g"(start)
    123 				      : "d4");
    124 			return 0;
    125 		}
    126 		IOCS_B_PRINT(BOOT ": No bootable partition.\r\n");
    127 		return 0;
    128 	}
    129 
    130 	return 0;
    131 }
    132