/*      $NetBSD: bootmain.c,v 1.9 2024/01/07 07:58:34 isaki Exp $       */

/*-
 * Copyright (c) 1993, 1994 Takumi Nakamura.
 * Copyright (c) 1999, 2000 Itoh Yasufumi.
 * Copyright (c) 2001 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Takumi Nakamura.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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/param.h>
#include <sys/types.h>
#include <machine/bootinfo.h>
#include <machine/disklabel.h>
#include <lib/libsa/stand.h>
#include <lib/libsa/loadfile.h>

#include "xxboot.h"
#include "libx68k.h"
#include "iocs.h"
#include "exec_image.h"

#define EXSCSI_BDID     ((void *)0x00ea0001)

static int get_scsi_host_adapter(char *);
int get_scsi_part(void);
void bootmain(void) __attribute__ ((__noreturn__));

#if defined(XXBOOT_DEBUG)
/* Print 'x' as 'width' digit hex number */
void
print_hex(unsigned int x, int width)
{

        if (width > 0) {
                print_hex(x >> 4, width - 1);
                x &= 0x0F;
                if (x > 9)
                        x += 7;
                IOCS_B_PUTC((unsigned int) '0' + x);
        }
}
#endif

/*
 * Check the type of SCSI interface
 */
static int
get_scsi_host_adapter(char *devstr)
{
        uint8_t *bootrom;
        int ha;

#ifdef XXBOOT_DEBUG
        *(uint32_t *)(devstr +  0) = '/' << 24 | 's' << 16 | 'p' << 8 | 'c';
#if defined(CDBOOT)
        *(uint32_t *)(devstr +  4) = '@' << 24 | '0' << 16 | '/' << 8 | 'c';
#else
        *(uint32_t *)(devstr +  4) = '@' << 24 | '0' << 16 | '/' << 8 | 's';
#endif
        *(uint32_t *)(devstr +  8) = 'd' << 24 | '@' << 16 | '0' << 8 | ',';
        *(uint32_t *)(devstr + 12) = '0' << 24 | ':' << 16 | 'a' << 8 | '\0';
#endif

        bootrom = (uint8_t *)(BOOT_INFO & 0x00ffffe0);
        /*
         * bootrom+0x24 "SCSIIN" ... Internal SCSI (spc@0)
         *              "SCSIEX" ... External SCSI (spc@1 or mha@0)
         */
        if (*(uint16_t *)(bootrom + 0x24 + 4) == 0x494e) {      /* "IN" */
                ha = (X68K_BOOT_SCSIIF_SPC << 4) | 0;
        } else if (badbaddr(EXSCSI_BDID)) {
                ha = (X68K_BOOT_SCSIIF_MHA << 4) | 0;
#ifdef XXBOOT_DEBUG
                *(uint32_t *)devstr =
                    ('/' << 24) | ('m' << 16) | ('h' << 8) | 'a';
#endif
        } else {
                ha = (X68K_BOOT_SCSIIF_SPC << 4) | 1;
#ifdef XXBOOT_DEBUG
                devstr[5] = '1';
#endif
        }

        return ha;
}

#define PARTTBL_TOP     (4)     /* sector pos of part info in 512byte/sector */
#define NPART           (15)    /* total number of Human68k partitions */
#define MAXPART         (6)
int
get_scsi_part(void)
{
        union {
                char pad[1024];
                struct {
                        uint32_t magic;         /* 0x5836384b ("X68k") */
                        uint32_t parttotal;     /* total block# -1 */
                        uint32_t diskblocks;
                        uint32_t diskblocks2;   /* backup? */
                        struct dos_partition parttbl[NPART];
                } __packed;
        } partbuf;
        int i;
        int part_top;

        /*
         * Read partition table.
         * The actual partition table size we want to read is 256 bytes but
         * raw_read() for SCSI requires bytelen a multiple of sector size
         * (SCSI_CAP.blocksize).  Human68k supports sector size only 256,
         * 512 and 1024 so that we always use 1024 bytes fixed length buffer.
         */
        raw_read(PARTTBL_TOP, SCSI_CAP.blocksize, &partbuf);

        if (partbuf.magic != 0x5836384b/*"X68k"*/) {
                BOOT_ERROR("Bad Human68k partition table");
                /* NOTREACHED */
        }

        /*
         * SCSI_PARTTOP is top sector # of this partition in sector size
         * of this device (normally 512 bytes/sector).
         * part_top is top block # of this partition in 1024 bytes/block.
         * Human68k partition table uses 1024 bytes/block unit.
         */
        part_top = SCSI_PARTTOP >> (2 - SCSI_BLKLEN);
        for (i = 0; i < MAXPART; i++) {
                if ((uint32_t)partbuf.parttbl[i].dp_start == part_top)
                        goto found;
        }
        BOOT_ERROR("Can't find this partition?");
        /* NOTREACHED */
found:
        /* bsd disklabel's c: means whole disk.  Skip it */
        if (i >= 2)
                i++;
        return i;
}

void
bootmain(void)
{
        int bootdev, fd;
        char bootdevstr[16];
        u_long marks[MARK_MAX];

        IOCS_B_PRINT(bootprog_name);
        IOCS_B_PRINT(" rev.");
        IOCS_B_PRINT(bootprog_rev);
        IOCS_B_PRINT("\r\n");

#if defined(XXBOOT_DEBUG)
        /* Print the initial registers */
        int i;
        for (i = 0; i < __arraycount(startregs); i++) {
                print_hex(startregs[i], 8);
                IOCS_B_PRINT((i & 7) == 7 ? "\r\n" : " ");
        }
        IOCS_B_PRINT("BOOT_INFO ");
        print_hex(BOOT_INFO, 8);
        IOCS_B_PRINT("\r\n");
#endif

        if (BINF_ISFD(&BOOT_INFO)) {
                /* floppy */
                int minor;
                /* fdNa for 1024 bytes/sector, fdNc for 512 bytes/sector */
                minor = (FDSEC.minsec.N == 3) ? 0 : 2;
                bootdev = X68K_MAKEBOOTDEV(X68K_MAJOR_FD, BOOT_INFO & 3, minor);
#ifdef XXBOOT_DEBUG
                *(uint32_t *)bootdevstr =
                    ('f' << 24) | ('d' << 16) | ('@' << 8) |
                    ('0' + (BOOT_INFO & 3));
                bootdevstr[4] = 'a' + minor;
                bootdevstr[5] = '\0';
#endif
        } else {
                /* SCSI */
                int major, ha, part;
                ha = get_scsi_host_adapter(bootdevstr);
                part = 0;
#if defined(CDBOOT)
                major = X68K_MAJOR_CD;
#else
                major = X68K_MAJOR_SD;
                if (SCSI_PARTTOP != 0)
                        part = get_scsi_part();
#endif
                bootdev = X68K_MAKESCSIBOOTDEV(major, ha >> 4, ha & 15,
                    SCSI_ID & 7, 0, part);
#ifdef XXBOOT_DEBUG
                bootdevstr[10] = '0' + (SCSI_ID & 7);
                bootdevstr[14] = 'a' + part;
#endif
        }

#ifdef XXBOOT_DEBUG
        IOCS_B_PRINT("boot device: ");
        IOCS_B_PRINT(bootdevstr);
#endif
        IOCS_B_PRINT("\r\n");

        marks[MARK_START] = BOOT_TEXTADDR;

#if defined(XXBOOT_USTARFS)
        /* ustarfs requires mangled filename... */
        fd = loadfile("USTAR.volsize.4540", marks,
            LOAD_TEXT|LOAD_DATA|LOAD_BSS);
#else
        /* XXX what is x68k/boot? */
        fd = loadfile("x68k/boot", marks, LOAD_TEXT|LOAD_DATA|LOAD_BSS);
        if (fd < 0)
                fd = loadfile("boot", marks, LOAD_TEXT|LOAD_DATA|LOAD_BSS);
#endif
        if (fd >= 0) {
                close(fd);
                exec_image(BOOT_TEXTADDR, /* image loaded at */
                           BOOT_TEXTADDR, /* image executed at */
                           BOOT_TEXTADDR, /* XXX: entry point */
                           0,             /* XXX: image size */
                           bootdev, 0);   /* arguments */
        }
        IOCS_B_PRINT("can't load the secondary bootstrap.");
        exit(0);
}

int
devopen(struct open_file *f, const char *fname, char **file)
{

        *file = __UNCONST(fname);
        return DEV_OPEN()(f);
}