/*
	ROMEMDEV.c

	Copyright (C) 2007 Philip Cummins, Paul C. Pratt

	You can redistribute this file and/or modify it under the terms
	of version 2 of the GNU General Public License as published by
	the Free Software Foundation.  You should have received a copy
	of the license along with this file; see the file COPYING.

	This file 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
	license for more details.
*/

/*
	Read Only Memory EMulated DEVice

	Checks the header of the loaded ROM image, and then patches
	the ROM image.

	This code descended from "ROM.c" in vMac by Philip Cummins.
*/

#ifndef AllFiles
#include "SYSDEPNS.h"
#include "MYOSGLUE.h"
#include "ENDIANAC.h"
#include "EMCONFIG.h"
#include "GLOBGLUE.h"
#endif

#include "ROMEMDEV.h"

#define UseSonyPatch \
	((CurEmMd <= kEmMd_Classic) || (CurEmMd == kEmMd_II) \
		|| (CurEmMd == kEmMd_IIx))

#define UseLargeScreenHack \
	(IncludeVidMem \
	&& (CurEmMd != kEmMd_PB100) \
	&& (CurEmMd != kEmMd_II) \
	&& (CurEmMd != kEmMd_IIx))

#if UseSonyPatch
LOCALVAR const ui3b sony_driver[] = {
/*
	Replacement for .Sony driver
	68k machine code, compiled from mydriver.a
*/
0x4F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xEE, 0x00, 0x18, 0x00, 0x24, 0x00, 0x4A,
0x00, 0x8A, 0x05, 0x2E, 0x53, 0x6F, 0x6E, 0x79,
0x48, 0xE7, 0x00, 0xC0, 0x55, 0x4F, 0x3F, 0x3C,
0x00, 0x01, 0x60, 0x30, 0x48, 0xE7, 0x00, 0xC0,
0x55, 0x4F, 0x3F, 0x3C, 0x00, 0x02, 0x41, 0xFA,
0x01, 0x84, 0x2F, 0x18, 0x20, 0x50, 0x20, 0x8F,
0x5C, 0x4F, 0x30, 0x1F, 0x4C, 0xDF, 0x03, 0x00,
0x0C, 0x68, 0x00, 0x01, 0x00, 0x1A, 0x66, 0x1E,
0x4E, 0x75, 0x48, 0xE7, 0x00, 0xC0, 0x55, 0x4F,
0x3F, 0x3C, 0x00, 0x03, 0x41, 0xFA, 0x01, 0x5E,
0x2F, 0x18, 0x20, 0x50, 0x20, 0x8F, 0x5C, 0x4F,
0x30, 0x1F, 0x4C, 0xDF, 0x03, 0x00, 0x32, 0x28,
0x00, 0x06, 0x08, 0x01, 0x00, 0x09, 0x67, 0x0C,
0x4A, 0x40, 0x6F, 0x02, 0x42, 0x40, 0x31, 0x40,
0x00, 0x10, 0x4E, 0x75, 0x4A, 0x40, 0x6F, 0x04,
0x42, 0x40, 0x4E, 0x75, 0x2F, 0x38, 0x08, 0xFC,
0x4E, 0x75, 0x48, 0xE7, 0x00, 0xC0, 0x55, 0x4F,
0x3F, 0x3C, 0x00, 0x04, 0x41, 0xFA, 0x01, 0x1E,
0x2F, 0x18, 0x20, 0x50, 0x20, 0x8F, 0x5C, 0x4F,
0x30, 0x1F, 0x4C, 0xDF, 0x03, 0x00, 0x4E, 0x75,
0x48, 0xE7, 0xE0, 0xC0, 0x20, 0x2F, 0x00, 0x14,
0x59, 0x4F, 0x2F, 0x00, 0x55, 0x4F, 0x3F, 0x3C,
0x00, 0x08, 0x41, 0xFA, 0x00, 0xF8, 0x2F, 0x18,
0x20, 0x50, 0x20, 0x8F, 0x5C, 0x4F, 0x32, 0x1F,
0x58, 0x4F, 0x20, 0x1F, 0x4A, 0x41, 0x66, 0x06,
0x30, 0x7C, 0x00, 0x07, 0xA0, 0x2F, 0x4C, 0xDF,
0x03, 0x07, 0x58, 0x4F, 0x4E, 0x73, 0x21, 0x40,
0x00, 0x06, 0x43, 0xF8, 0x03, 0x08, 0x4E, 0xF9,
0x00, 0x40, 0x0B, 0x20, 0x4E, 0x75, 0x48, 0xE7,
0x1F, 0x10, 0x48, 0xE7, 0x00, 0xC0, 0x5D, 0x4F,
0x3F, 0x3C, 0x00, 0x05, 0x41, 0xFA, 0x00, 0xB6,
0x2F, 0x18, 0x20, 0x50, 0x20, 0x8F, 0x5C, 0x4F,
0x30, 0x1F, 0x2E, 0x1F, 0x0C, 0x40, 0xFF, 0xCF,
0x66, 0x06, 0x42, 0x40, 0x60, 0x00, 0x00, 0x8E,
0x4A, 0x40, 0x66, 0x00, 0x00, 0x88, 0x20, 0x07,
0xA7, 0x1E, 0x26, 0x48, 0x20, 0x0B, 0x67, 0x00,
0x00, 0x86, 0x9E, 0xFC, 0x00, 0x10, 0x2F, 0x0B,
0x2F, 0x07, 0x55, 0x4F, 0x3F, 0x3C, 0x00, 0x06,
0x41, 0xFA, 0x00, 0x7A, 0x2F, 0x18, 0x20, 0x50,
0x20, 0x8F, 0x5C, 0x4F, 0x30, 0x1F, 0x50, 0x4F,
0x2E, 0x1F, 0x76, 0x00, 0x36, 0x1F, 0x38, 0x1F,
0x3C, 0x1F, 0x3A, 0x1F, 0x26, 0x5F, 0x4A, 0x40,
0x66, 0x4A, 0x20, 0x0B, 0x67, 0x0E, 0x41, 0xFA,
0xFF, 0x8C, 0x27, 0x48, 0x00, 0x06, 0x20, 0x4B,
0xA0, 0x58, 0x60, 0x1A, 0x41, 0xFA, 0xFF, 0x70,
0x30, 0x3C, 0xA0, 0x4E, 0xA0, 0x47, 0x60, 0x0E,
0x20, 0x47, 0x30, 0x06, 0x48, 0x40, 0x30, 0x05,
0xA0, 0x4E, 0xDE, 0x83, 0x52, 0x46, 0x51, 0xCC,
0xFF, 0xF0, 0x48, 0x7A, 0xFF, 0x1C, 0x55, 0x4F,
0x3F, 0x3C, 0x00, 0x07, 0x41, 0xFA, 0x00, 0x1E,
0x2F, 0x18, 0x20, 0x50, 0x20, 0x8F, 0x5C, 0x4F,
0x30, 0x1F, 0x58, 0x4F, 0x4C, 0xDF, 0x03, 0x00,
0x4C, 0xDF, 0x08, 0xF8, 0x4E, 0x75, 0x30, 0x3C,
0xFF, 0xFF, 0x60, 0xF0
};
#endif

#if UseSonyPatch
LOCALVAR const ui3b my_disk_icon[] = {
	0x7F, 0xFF, 0xFF, 0xF0,
	0x81, 0x00, 0x01, 0x08,
	0x81, 0x00, 0x71, 0x04,
	0x81, 0x00, 0x89, 0x02,
	0x81, 0x00, 0x89, 0x01,
	0x81, 0x00, 0x89, 0x01,
	0x81, 0x00, 0x89, 0x01,
	0x81, 0x00, 0x89, 0x01,
	0x81, 0x00, 0x89, 0x01,
	0x81, 0x00, 0x71, 0x01,
	0x81, 0x00, 0x01, 0x01,
	0x80, 0xFF, 0xFE, 0x01,
	0x80, 0x00, 0x00, 0x01,
	0x80, 0x00, 0x00, 0x01,
	0x80, 0x00, 0x00, 0x01,
	0x80, 0x00, 0x00, 0x01,
	0x83, 0xFF, 0xFF, 0xC1,
	0x84, 0x00, 0x00, 0x21,
	0x84, 0x00, 0x00, 0x21,
	0x84, 0x00, 0x00, 0x21,
	0x84, 0x00, 0x00, 0x21,
	0x84, 0x00, 0x00, 0x21,
	0x84, 0x06, 0x30, 0x21,
	0x84, 0x06, 0x60, 0x21,
	0x84, 0x06, 0xC0, 0x21,
	0x84, 0x07, 0x80, 0x21,
	0x84, 0x07, 0x00, 0x21,
	0x84, 0x06, 0x00, 0x21,
	0x84, 0x00, 0x00, 0x21,
	0x84, 0x00, 0x00, 0x21,
	0x84, 0x00, 0x00, 0x21,
	0x7F, 0xFF, 0xFF, 0xFE,

	/* mask */

	0x3F, 0xFF, 0xFF, 0xF0,
	0x7F, 0xFF, 0xFF, 0xF0,
	0xFF, 0xFF, 0xFF, 0xFC,
	0xFF, 0xFF, 0xFF, 0xFC,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0x7F, 0xFF, 0xFF, 0xFC,
	0x3F, 0xFF, 0xFF, 0xFC,

	/* empty pascal string */
	0x00, 0x00,
};
#endif

#if CurEmMd <= kEmMd_128K
#define Sony_DriverBase 0x1690
#elif CurEmMd <= kEmMd_Plus
#define Sony_DriverBase 0x17D30
#elif CurEmMd <= kEmMd_Classic
#define Sony_DriverBase 0x34680
#elif (CurEmMd == kEmMd_II) || (CurEmMd == kEmMd_IIx)
#define Sony_DriverBase 0x2D72C
#endif

#define kVidMem_Base 0x00540000

#if UseSonyPatch
LOCALPROC Sony_Install(void)
{
	ui3p pto = Sony_DriverBase + ROM;

	MyMoveBytes((anyp)sony_driver, (anyp)pto, sizeof(sony_driver));
	pto += sizeof(sony_driver);

	do_put_mem_word(pto, kcom_callcheck);
	pto += 2;
	do_put_mem_word(pto, kExtnSony);
	pto += 2;
	do_put_mem_long(pto, kExtn_Block_Base); /* pokeaddr */
	pto += 4;

	my_disk_icon_addr = (pto - ROM) + kROM_Base;
	MyMoveBytes((anyp)my_disk_icon, (anyp)pto, sizeof(my_disk_icon));
	pto += sizeof(my_disk_icon);

#if UseLargeScreenHack
	{
		ui3p patchp = pto;

#include "SCRNHACK.h"
	}
#endif
}
#endif

LOCALFUNC blnr Check_Checksum(ui5r CheckSum1)
{
	long int i;
	ui5b CheckSum2 = 0;
	ui3p p = 4 + ROM;

	for (i = (kCheckSumRom_Size - 4) >> 1; --i >= 0; ) {
		CheckSum2 += do_get_mem_word(p);
		p += 2;
	}
	return (CheckSum1 == CheckSum2);
}

GLOBALFUNC blnr ROM_Init(void)
{
	ui5r CheckSum = do_get_mem_long(ROM);

	if (! Check_Checksum(CheckSum)) {
		WarnMsgCorruptedROM();
	} else
#if CurEmMd <= kEmMd_128K
	if (CheckSum == 0x28BA61CE) {
	} else
	if (CheckSum == 0x28BA4E50) {
	} else
#elif CurEmMd <= kEmMd_Plus
	if (CheckSum == 0x4D1EEEE1) {
		/* Mac Plus ROM v 1, 'Lonely Hearts' */
	} else
	if (CheckSum == 0x4D1EEAE1) {
		/* Mac Plus ROM v 2, 'Lonely Heifers' */
	} else
	if (CheckSum == 0x4D1F8172) {
		/* Mac Plus ROM v 3, 'Loud Harmonicas' */
	} else
#elif CurEmMd <= kEmMd_SE
	if (CheckSum == 0xB2E362A8) {
	} else
#elif CurEmMd <= kEmMd_SEFDHD
	if (CheckSum == 0xB306E171) {
	} else
#elif CurEmMd <= kEmMd_Classic
	if (CheckSum == 0xA49F9914) {
	} else
#elif CurEmMd <= kEmMd_PB100
	if (CheckSum == 0x96645F9C) {
	} else
#elif CurEmMd <= kEmMd_II
	if (CheckSum == 0x9779D2C4) {
	} else
	if (CheckSum == 0x97221136) {
		/* accept IIx ROM */
	} else
#elif CurEmMd <= kEmMd_IIx
	if (CheckSum == 0x97221136) {
	} else
#endif
	{
		WarnMsgUnsupportedROM();
	}
	/*
		Even if ROM is corrupt or unsupported, go ahead and
		try to run anyway. It shouldn't do any harm.
	*/

/* skip the rom checksum */
#if CurEmMd <= kEmMd_128K
	do_put_mem_word(226 + ROM, 0x6004);
#elif CurEmMd <= kEmMd_Plus
	do_put_mem_word(3450 + ROM, 0x6022);
#elif CurEmMd <= kEmMd_Classic
	do_put_mem_word(7272 + ROM, 0x6008);
#elif (CurEmMd == kEmMd_II) || (CurEmMd == kEmMd_IIx)
	do_put_mem_word(0x2AB0 + ROM, 0x6008);
#endif

#if CurEmMd <= kEmMd_128K
#elif CurEmMd <= kEmMd_Plus
	do_put_mem_word(3752 + ROM, 0x4E71);
		/* shorten the ram check read */
	do_put_mem_word(3728 + ROM, 0x4E71);
		/* shorten the ram check write */
#elif CurEmMd <= kEmMd_Classic
	do_put_mem_word(134 + ROM, 0x6002);
	do_put_mem_word(286 + ROM, 0x6002);
#elif (CurEmMd == kEmMd_II) || (CurEmMd == kEmMd_IIx)
	do_put_mem_word(0xEE + ROM, 0x6002);
	do_put_mem_word(0x1AA + ROM, 0x6002);
#endif

	/* do_put_mem_word(862 + ROM, 0x4E71); */ /* shorten set memory */

#if UseSonyPatch
	Sony_Install();
#endif

	return trueblnr;
}