/*      $NetBSD: mboot.c,v 1.12 2012/04/06 09:44:44 isaki Exp $ */

/*-
 * Copyright (c) 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Minoura Makoto.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/types.h>
#include <machine/disklabel.h>

#include "iocs.h"

int bootmain(int);

#define PART_BOOTABLE   0
#define PART_UNUSED     1
#define PART_INUSE      2

int
bootmain(int scsiid)
{
        struct iocs_readcap cap;
        int size;

        if (IOCS_BITSNS(0) & 1) /* ESC key */
                return 0;

        if (IOCS_S_READCAP(scsiid, &cap) < 0) {
                IOCS_B_PRINT(BOOT ": Error in reading.\r\n");
                return 0;
        }
        size = cap.size >> 9;

        {
                long *label = (void*) 0x3000;
                if (IOCS_S_READ(0, 1, scsiid, size, label) < 0) {
                        IOCS_B_PRINT(BOOT ": Error in reading.\r\n");
                        return 0;
                }
                if (label[0] != 0x58363853 ||
                    label[1] != 0x43534931) {
                        IOCS_B_PRINT(BOOT ": Invalid disk.\r\n");
                        return 0;
                }
        }

        {
                struct cpu_disklabel *label = (void*) 0x3000;
                int i, firstinuse=-1;
                unsigned char *t;

                if (IOCS_S_READ(2<<(2-size), size?2:1, scsiid, size, label) < 0) {
                        IOCS_B_PRINT(BOOT ": Error in reading.\r\n");
                        return 0;
                }
                t = label->dosparts[0].dp_typname;
                if (t[0] != 'X' || t[1] != '6' || t[2] != '8' || t[3] != 'K') {
                        IOCS_B_PRINT(BOOT ": Invalid disk.\r\n");
                        return 0;
                }

                for (i = 1; i < NDOSPART; i++) {
                        if (label->dosparts[i].dp_flag == PART_BOOTABLE)
                                break;
                        else if (label->dosparts[i].dp_flag == PART_INUSE)
                                firstinuse = i;
                }
                if (i >= NDOSPART && firstinuse >= 0)
                        i = firstinuse;
                if (i < NDOSPART) {
                        unsigned int start = label->dosparts[i].dp_start;
                        unsigned int start1 = start << (2-size);
                        int r;
                        if ((start1 & 0x1fffff) == 0x1fffff)
                                r = IOCS_S_READ(start1,
                                                8>>size,
                                                scsiid,
                                                size,
                                                (void*) 0x2400);
                        else
                                r = IOCS_S_READEXT(start1,
                                                   8>>size,
                                                   scsiid,
                                                   size,
                                                   (void*) 0x2400);
                        if (r < 0) {
                                IOCS_B_PRINT(BOOT ": Error in reading.\r\n");
                                return 0;
                        }
                        if (*((char*) 0x2400) != 0x60) {
                                IOCS_B_PRINT(BOOT ": Invalid disk.\r\n");
                                return 0;
                        }
                        __asm volatile ("movl %0,%%d4\n\t"
                                      "movl %1,%%d2\n\t"
                                      "jsr 0x2400"
                                      :
                                      : "g" (scsiid), "g"(start)
                                      : "d4");
                        return 0;
                }
                IOCS_B_PRINT(BOOT ": No bootable partition.\r\n");
                return 0;
        }

        return 0;
}