/*
 * cbm2rom.c - CBM-6x0/7x0 rom code.
 *
 * Written by
 *  Andreas Boose <viceteam@t-online.de>
 *  Andre Fachat <fachat@physik.tu-chemnitz.de>
 *
 * This file is part of VICE, the Versatile Commodore Emulator.
 * See README for copyright notice.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307  USA.
 *
 */

#include "vice.h"

#include <stdio.h>
#include <string.h>

#include "autostart.h"
#include "cbm2.h"
#include "cbm2mem.h"
#include "cbm2rom.h"
#include "crtc.h"
#include "kbdbuf.h"
#include "log.h"
#include "machine.h"
#include "resources.h"
#include "sysfile.h"
#include "tape.h"
#include "types.h"
#include "util.h"


static log_t cbm2rom_log = LOG_ERR;

/* Flag: nonzero if the ROM has been loaded. */
static int rom_loaded = 0;

static tape_init_t tapeinit = {
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    NULL,
    36 * 8,
    54 * 8,
    55 * 8,
    73 * 8,
    74 * 8,
    100 * 8
};


int cbm2rom_load_chargen(const char *rom_name)
{
    int i;

    if (!rom_loaded) {
        return 0;  /* init not far enough */
    }
    /* Load chargen ROM
     * we load 4k of 16-byte-per-char Charrom.
     * Then we generate the inverted chars */

    if (!util_check_null_string(rom_name)) {
        memset(mem_chargen_rom, 0, CBM2_CHARGEN_ROM_SIZE);

        if (sysfile_load(rom_name, mem_chargen_rom, 4096, 4096) < 0) {
            log_error(cbm2rom_log, "Couldn't load character ROM '%s'.",
                      rom_name);
            return -1;
        }

        memmove(mem_chargen_rom + 4096, mem_chargen_rom + 2048, 2048);

        /* Inverted chargen into second half. This is a hardware feature.*/
        for (i = 0; i < 2048; i++) {
            mem_chargen_rom[i + 2048] = mem_chargen_rom[i] ^ 0xff;
            mem_chargen_rom[i + 6144] = mem_chargen_rom[i + 4096] ^ 0xff;
        }
    }

    crtc_set_chargen_addr(mem_chargen_rom, CBM2_CHARGEN_ROM_SIZE >> 4);

    return 0;
}

int cbm2rom_checksum(void)
{
    int i, delay;
    WORD sum;

    /* Checksum over top 8 kByte kernal.  */
    for (i = 0xe000, sum = 0; i < 0x10000; i++) {
        sum += mem_rom[i];
    }
    log_message(cbm2rom_log, "Kernal checksum is %d ($%04X).", sum, sum);

    resources_get_int("AutostartDelay", &delay);
    if (delay == 0) {
        delay = 10; /* default */
    }
    autostart_init((CLOCK)(delay * C610_PAL_RFSH_PER_SEC * C610_PAL_CYCLES_PER_RFSH), 0,
                    0, /* Pointer: Cursor Blink enable: 0 = Flash Cursor */
                    0xc8, /* Pointer: Current Screen Line Address */
                    0xcb, /* Pointer: Cursor Column on Current Line */
                    -80); /* chars per line */
    return 0;
}

int cbm2rom_load_kernal(const char *rom_name)
{
    if (!rom_loaded) {
        return 0;  /* init not far enough */
    }
    /* De-initialize kbd-buf, autostart and tape stuff here before
       reloading the ROM the traps are installed in.  */
    kbdbuf_init(0, 0, 0, 0);
    autostart_init(0, 0, 0, 0, 0, 0);
    tape_init(&tapeinit);

    /* Load Kernal ROM.  */
    if (!util_check_null_string(rom_name)) {
        if (sysfile_load(rom_name, mem_rom + 0xe000, 0x2000, 0x2000) < 0) {
            log_error(cbm2rom_log, "Couldn't load ROM `%s'.", rom_name);
            return -1;
        }
    }

    return cbm2rom_checksum();
}

int cbm2rom_load_basic(const char *rom_name)
{
    if (!rom_loaded) {
        return 0;  /* init not far enough */
    }
    /* Load BASIC ROM.  */
    if (!util_check_null_string(rom_name)) {
        if ((sysfile_load(rom_name, mem_rom + 0x8000, 0x4000, 0x4000) < 0)) {
            log_error(cbm2rom_log, "Couldn't load BASIC ROM `%s'.",
                      rom_name);
            return -1;
        }
    } else {
        log_warning(cbm2rom_log, "Disabling BASIC by unloading ROM!");
        memset(mem_rom + 0x8000, 0xff, 0x4000);
    }
    return 0;
}

int cbm2rom_load_cart_1(const char *rom_name)
{
    if (!rom_loaded) {
        return 0;  /* init not far enough */
    }
    if (!util_check_null_string(rom_name)) {
        if ((sysfile_load(rom_name, mem_rom + 0x1000, 0x1000, 0x1000) < 0)) {
            log_error(cbm2rom_log, "Couldn't load ROM `%s'.",
                      rom_name);
        }
    } else {
        memset(mem_rom + 0x1000, 0xff, 0x1000);
    }
    return 0;
}

int cbm2rom_load_cart_2(const char *rom_name)
{
    if (!rom_loaded) {
        return 0;  /* init not far enough */
    }
    if (!util_check_null_string(rom_name)) {
        if ((sysfile_load(rom_name, mem_rom + 0x2000, 0x2000, 0x2000) < 0)) {
            log_error(cbm2rom_log, "Couldn't load ROM `%s'.",
                      rom_name);
        }
    } else {
        memset(mem_rom + 0x2000, 0xff, 0x2000);
    }
    return 0;
}

int cbm2rom_load_cart_4(const char *rom_name)
{
    if (!rom_loaded) {
        return 0;  /* init not far enough */
    }
    if (!util_check_null_string(rom_name)) {
        if ((sysfile_load(rom_name, mem_rom + 0x4000, 0x2000, 0x2000) < 0)) {
            log_error(cbm2rom_log, "Couldn't load ROM `%s'.",
                      rom_name);
        }
    } else {
        memset(mem_rom + 0x4000, 0xff, 0x2000);
    }
    return 0;
}

int cbm2rom_load_cart_6(const char *rom_name)
{
    if (!rom_loaded) {
        return 0;  /* init not far enough */
    }
    if (!util_check_null_string(rom_name)) {
        if ((sysfile_load(rom_name, mem_rom + 0x6000, 0x2000, 0x2000) < 0)) {
            log_error(cbm2rom_log, "Couldn't load ROM `%s'.",
                      rom_name);
        }
    } else {
        memset(mem_rom + 0x6000, 0xff, 0x2000);
    }
    return 0;
}

/* Load memory image files. */
int mem_load(void)
{
    int i;
    const char *rom_name = NULL;

    if (cbm2rom_log == LOG_ERR) {
        cbm2rom_log = log_open("CBM2MEM");
    }

    rom_loaded = 1;

    if (resources_get_string("ChargenName", &rom_name) < 0) {
        return -1;
    }
    if (cbm2rom_load_chargen(rom_name) < 0) {
        return -1;
    }

    /* Init Disk/Cartridge ROM with 'unused address' values.  */
    for (i = 0x800; i < 0x8000; i++) {
        mem_rom[i] = 0xff;
    }

    if (resources_get_string("KernalName", &rom_name) < 0) {
        return -1;
    }
    if (cbm2rom_load_kernal(rom_name) < 0) {
        return -1;
    }

    if (resources_get_string("BasicName", &rom_name) < 0) {
        return -1;
    }
    if (cbm2rom_load_basic(rom_name) < 0) {
        return -1;
    }

    /* Load extension ROMs.  */
    if (resources_get_string("Cart1Name", &rom_name) < 0) {
        return -1;
    }
    if (cbm2rom_load_cart_1(rom_name) < 0) {
        return -1;
    }

    if (resources_get_string("Cart2Name", &rom_name) < 0) {
        return -1;
    }
    if (cbm2rom_load_cart_2(rom_name) < 0) {
        return -1;
    }

    if (resources_get_string("Cart4Name", &rom_name) < 0) {
        return -1;
    }
    if (cbm2rom_load_cart_4(rom_name) < 0) {
        return -1;
    }

    if (resources_get_string("Cart6Name", &rom_name) < 0) {
        return -1;
    }
    if (cbm2rom_load_cart_6(rom_name) < 0) {
        return -1;
    }

    crtc_set_screen_addr(mem_rom + 0xd000);

    return 0;
}
