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// license:BSD-3-Clause
// copyright-holders:David Haywood, ElSemi
/***********************************************************************
 PGM 012 + 025 PGM protection emulation

 these are simulations of the IGS 012 and 025 protection combination
 used on the following PGM games

 Dragon World 2

 ----

 IGS012 provides ROM overlay???

 IGS025 is some kind of state machine / logic device which the game
 uses for various security checks bitswap checks.

 ***********************************************************************/

#include "emu.h"
#include "includes/pgm.h"
#include "machine/pgmprot_igs025_igs012.h"

/* Dragon World 2 */

void pgm_012_025_state::pgm_drgw2_decrypt()
{
	int i;
	uint16_t *src = (uint16_t *) (memregion("maincpu")->base()+0x100000);

	int rom_size = 0x80000;

	for (i = 0; i < rom_size / 2; i++)
	{
		uint16_t x = src[i];

		if (((i & 0x20890) == 0) || ((i & 0x20000) == 0x20000 && (i & 0x01500) != 0x01400))
			x ^= 0x0002;

		if (((i & 0x20400) == 0 && (i & 0x02010) != 0x02010) || ((i & 0x20000) == 0x20000 && (i & 0x00148) != 0x00140))
			x ^= 0x0400;

		src[i] = x;
	}
}

// All tables all xored by 'warning' information at $1354ee (drgw2)
// tables are the same as drgw3 and olds
static const uint8_t drgw2_source_data[0x08][0xec] =
{
	{ 0, }, // Region 0, not used
	{   // Region 1, $13A886
		0x67, 0x51, 0xF3, 0x19, 0xA0, 0x11, 0xB1, 0x11, 0xB0, 0xEE, 0xE3, 0xF6, 0xBE, 0x81, 0x35, 0xE3,
		0xFB, 0xE6, 0xEF, 0xDF, 0x61, 0x01, 0xFA, 0x22, 0x5D, 0x43, 0x01, 0xA5, 0x3B, 0x17, 0xD4, 0x74,
		0xF0, 0xF4, 0xF3, 0x43, 0xB5, 0x19, 0x04, 0xD5, 0x84, 0xCE, 0x87, 0xFE, 0x35, 0x3E, 0xC4, 0x3C,
		0xC7, 0x85, 0x2A, 0x33, 0x00, 0x86, 0xD0, 0x4D, 0x65, 0x4B, 0xF9, 0xE9, 0xC0, 0xBA, 0xAA, 0x77,
		0x9E, 0x66, 0xF6, 0x0F, 0x4F, 0x3A, 0xB6, 0xF1, 0x64, 0x9A, 0xE9, 0x25, 0x1A, 0x5F, 0x22, 0xA3,
		0xA2, 0xBF, 0x4B, 0x77, 0x3F, 0x34, 0xC9, 0x6E, 0xDB, 0x12, 0x5C, 0x33, 0xA5, 0x8B, 0x6C, 0xB1,
		0x74, 0xC8, 0x40, 0x4E, 0x2F, 0xE7, 0x46, 0xAE, 0x99, 0xFC, 0xB0, 0x55, 0x54, 0xDF, 0xA7, 0xA1,
		0x0F, 0x5E, 0x49, 0xCF, 0x56, 0x3C, 0x90, 0x2B, 0xAC, 0x65, 0x6E, 0xDB, 0x58, 0x3E, 0xC9, 0x00,
		0xAE, 0x53, 0x4D, 0x92, 0xFA, 0x40, 0xB2, 0x6B, 0x65, 0x4B, 0x90, 0x8A, 0x0C, 0xE2, 0xA5, 0x9A,
		0xD0, 0x20, 0x29, 0x55, 0xA4, 0x44, 0xAC, 0x51, 0x87, 0x54, 0x53, 0x34, 0x24, 0x4B, 0x81, 0x67,
		0x34, 0x4C, 0x5F, 0x31, 0x4E, 0xF2, 0xF1, 0x19, 0x18, 0x1C, 0x34, 0x38, 0xE1, 0x81, 0x17, 0xCF,
		0x24, 0xB9, 0x9A, 0xCB, 0x34, 0x51, 0x50, 0x59, 0x44, 0xB1, 0x0B, 0x50, 0x95, 0x6C, 0x48, 0x7E,
		0x14, 0xA4, 0xC6, 0xD9, 0xD3, 0xA5, 0xD6, 0xD0, 0xC5, 0x97, 0xF0, 0x45, 0xD0, 0x98, 0x51, 0x91,
		0x9F, 0xA3, 0x43, 0x51, 0x05, 0x90, 0xEE, 0xCA, 0x7E, 0x5F, 0x72, 0x53, 0xB1, 0xD3, 0xAF, 0x36,
		0x08, 0x75, 0xB0, 0x9B, 0xE0, 0x0D, 0x43, 0x88, 0xAA, 0x27, 0x44, 0x11
	},
	{ 0, }, // Region 2, not used
	{ 0, }, // Region 3, not used
	{ 0, }, // Region 4, not used
	{   // Region 5, $13ab42 (drgw2c)
		0x7F, 0x41, 0xF3, 0x39, 0xA0, 0x11, 0xA1, 0x11, 0xB0, 0xA2, 0x4C, 0x23, 0x13, 0xE9, 0x25, 0x3D,
		0x0F, 0x72, 0x3A, 0x9D, 0xB5, 0x96, 0xD1, 0xDA, 0x07, 0x29, 0x41, 0x9A, 0xAD, 0x70, 0xBA, 0x46,
		0x63, 0x2B, 0x7F, 0x3D, 0xBE, 0x40, 0xAD, 0xD4, 0x4C, 0x73, 0x27, 0x58, 0xA7, 0x65, 0xDC, 0xD6,
		0xFD, 0xDE, 0xB5, 0x6E, 0xD6, 0x6C, 0x75, 0x1A, 0x32, 0x45, 0xD5, 0xE3, 0x6A, 0x14, 0x6D, 0x80,
		0x84, 0x15, 0xAF, 0xCC, 0x7B, 0x61, 0x51, 0x82, 0x40, 0x53, 0x7F, 0x38, 0xA0, 0xD6, 0x8F, 0x61,
		0x79, 0x19, 0xE5, 0x99, 0x84, 0xD8, 0x78, 0x27, 0x3F, 0x16, 0x97, 0x78, 0x4F, 0x7B, 0x0C, 0xA6,
		0x37, 0xDB, 0xC6, 0x0C, 0x24, 0xB4, 0xC7, 0x94, 0x9D, 0x92, 0xD2, 0x3B, 0xD5, 0x11, 0x6F, 0x0A,
		0xDB, 0x76, 0x66, 0xE7, 0xCD, 0x18, 0x2B, 0x66, 0xD8, 0x41, 0x40, 0x58, 0xA2, 0x01, 0x1E, 0x6D,
		0x44, 0x75, 0xE7, 0x19, 0x4F, 0xB2, 0xE8, 0xC4, 0x96, 0x77, 0x62, 0x02, 0xC9, 0xDC, 0x59, 0xF3,
		0x43, 0x8D, 0xC8, 0xFE, 0x9E, 0x2A, 0xBA, 0x32, 0x3B, 0x62, 0xE3, 0x92, 0x6E, 0xC2, 0x08, 0x4D,
		0x51, 0xCD, 0xF9, 0x3A, 0x3E, 0xC9, 0x50, 0x27, 0x21, 0x25, 0x97, 0xD7, 0x0E, 0xF8, 0x39, 0x38,
		0xF5, 0x86, 0x94, 0x93, 0xBF, 0xEB, 0x18, 0xA8, 0xFC, 0x24, 0xF5, 0xF9, 0x99, 0x20, 0x3D, 0xCD,
		0x2C, 0x94, 0x25, 0x79, 0x28, 0x77, 0x8F, 0x2F, 0x10, 0x69, 0x86, 0x30, 0x43, 0x01, 0xD7, 0x9A,
		0x17, 0xE3, 0x47, 0x37, 0xBD, 0x62, 0x75, 0x42, 0x78, 0xF4, 0x2B, 0x57, 0x4C, 0x0A, 0xDB, 0x53,
		0x4D, 0xA1, 0x0A, 0xD6, 0x3A, 0x16, 0x15, 0xAA, 0x2C, 0x6C, 0x39, 0x42
	},
	{   // Region 6, $13ab42 (drgw2), $13ab2e (dw2v100x)
		0x12, 0x09, 0xF3, 0x29, 0xA0, 0x11, 0xA0, 0x11, 0xB0, 0xD5, 0x66, 0xA1, 0x28, 0x4A, 0x21, 0xC0,
		0xD3, 0x9B, 0x86, 0x80, 0x57, 0x6F, 0x41, 0xC2, 0xE4, 0x2F, 0x0B, 0x91, 0xBD, 0x3A, 0x7A, 0xBA,
		0x00, 0xE5, 0x35, 0x02, 0x74, 0x7D, 0x8B, 0x21, 0x57, 0x10, 0x0F, 0xAE, 0x44, 0xBB, 0xE2, 0x37,
		0x18, 0x7B, 0x52, 0x3D, 0x8C, 0x59, 0x9E, 0x20, 0x1F, 0x0A, 0xCC, 0x1C, 0x8E, 0x6A, 0xD7, 0x95,
		0x2B, 0x34, 0xB0, 0x82, 0x6D, 0xFD, 0x25, 0x33, 0xAA, 0x3B, 0x2B, 0x70, 0x15, 0x87, 0x31, 0x5D,
		0xBB, 0x29, 0x19, 0x95, 0xD5, 0x8E, 0x24, 0x28, 0x5E, 0xD0, 0x20, 0x83, 0x46, 0x4A, 0x21, 0x70,
		0x5B, 0xCD, 0xAE, 0x7B, 0x61, 0xA1, 0xFA, 0xF4, 0x2B, 0x84, 0x15, 0x6E, 0x36, 0x5D, 0x1B, 0x24,
		0x0F, 0x09, 0x3A, 0x61, 0x38, 0x0F, 0x18, 0x35, 0x11, 0x38, 0xB4, 0xBD, 0xEE, 0xF7, 0xEC, 0x0F,
		0x1D, 0xB7, 0x48, 0x01, 0xAA, 0x09, 0x8F, 0x61, 0xB5, 0x0F, 0x1D, 0x26, 0x39, 0x2E, 0x8C, 0xD6,
		0x26, 0x5C, 0x3D, 0x23, 0x63, 0xE9, 0x6B, 0x97, 0xB4, 0x9F, 0x7B, 0xB6, 0xBA, 0xA0, 0x7C, 0xC6,
		0x25, 0xA1, 0x73, 0x36, 0x67, 0x7F, 0x74, 0x1E, 0x1D, 0xDA, 0x70, 0xBF, 0xA5, 0x63, 0x35, 0x39,
		0x24, 0x8C, 0x9F, 0x85, 0x16, 0xD8, 0x50, 0x95, 0x71, 0xC0, 0xF6, 0x1E, 0x6D, 0x80, 0xED, 0x15,
		0xEB, 0x63, 0xE9, 0x1B, 0xF6, 0x78, 0x31, 0xC6, 0x5C, 0xDD, 0x19, 0xBD, 0xDF, 0xA7, 0xEC, 0x50,
		0x22, 0xAD, 0xBB, 0xF6, 0xEB, 0xD6, 0xA3, 0x20, 0xC9, 0xE6, 0x9F, 0xCB, 0xF2, 0x97, 0xB9, 0x54,
		0x12, 0x66, 0xA6, 0xBE, 0x4A, 0x12, 0x43, 0xEC, 0x00, 0xEA, 0x49, 0x02
	},
	{ 0, }  // Region 7, not used
};

MACHINE_RESET_MEMBER(pgm_012_025_state,drgw2)
{
	MACHINE_RESET_CALL_MEMBER(pgm);


}

void pgm_012_025_state::drgw2_common_init()
{
	m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xd80000, 0xd80003, read16_delegate(FUNC(igs025_device::killbld_igs025_prot_r), (igs025_device*)m_igs025), write16_delegate(FUNC(igs025_device::drgw2_d80000_protection_w), (igs025_device*)m_igs025));


	m_igs025->m_kb_source_data = drgw2_source_data;

	pgm_basic_init();
	pgm_drgw2_decrypt();


}

void pgm_012_025_state::drgw2_mem(address_map &map)
{
	pgm_mem(map);
	map(0x100000, 0x1fffff).bankr("bank1"); /* Game ROM */
	map(0xd00000, 0xd00fff).noprw(); // Written, but never read back? Related to the protection device? - IGS012?
}

MACHINE_CONFIG_START(pgm_012_025_state::pgm_012_025_drgw2)
	pgmbase(config);

	MCFG_DEVICE_MODIFY("maincpu")
	MCFG_DEVICE_PROGRAM_MAP(drgw2_mem)

	MCFG_DEVICE_ADD("igs025", IGS025, 0)
	//MCFG_IGS025_SET_EXTERNAL_EXECUTE( pgm_022_025_state, igs025_to_igs012_callback )

	MCFG_MACHINE_RESET_OVERRIDE(pgm_012_025_state,drgw2)
MACHINE_CONFIG_END


void pgm_012_025_state::init_drgw2()
{
	/* incomplete? */
	uint16_t *mem16 = (uint16_t *)memregion("maincpu")->base();

	drgw2_common_init();

	int region = 0x06;
	m_igs025->m_kb_region = region;
	m_igs025->m_kb_game_id = region | (region << 8) | (region << 16) | (region << 24);

	mem16[0x131098 / 2] = 0x4e93;
	mem16[0x13113e / 2] = 0x4e93;
	mem16[0x1311ce / 2] = 0x4e93;
}

void pgm_012_025_state::init_dw2v100x()
{
	uint16_t *mem16 = (uint16_t *)memregion("maincpu")->base();

	drgw2_common_init();

	int region = 0x06;
	m_igs025->m_kb_region = region;
	m_igs025->m_kb_game_id = region | (region << 8) | (region << 16) | (region << 24);

	mem16[0x131084 / 2] = 0x4e93;
	mem16[0x13112a / 2] = 0x4e93;
	mem16[0x1311ba / 2] = 0x4e93;
}

void pgm_012_025_state::init_drgw2c()
{
	uint16_t *mem16 = (uint16_t *)memregion("maincpu")->base();

	drgw2_common_init();

	int region = 0x05;
	m_igs025->m_kb_region = region;
	m_igs025->m_kb_game_id = region | (region << 8) | (region << 16) | (region << 24);

	mem16[0x1303bc / 2] = 0x4e93;
	mem16[0x130462 / 2] = 0x4e93;
	mem16[0x1304f2 / 2] = 0x4e93;
}

void pgm_012_025_state::init_drgw2j()
{
	uint16_t *mem16 = (uint16_t *)memregion("maincpu")->base();

	drgw2_common_init();

	int region = 0x01;
	m_igs025->m_kb_region = region;
	m_igs025->m_kb_game_id = region | (region << 8) | (region << 16) | (region << 24);

	mem16[0x1302c0 / 2] = 0x4e93;
	mem16[0x130366 / 2] = 0x4e93;
	mem16[0x1303f6 / 2] = 0x4e93;
}

void pgm_012_025_state::init_drgw2hk()
{
	drgw2_common_init();

	// todo, correct protection sequence for this region?
	int region = 0x01;
	m_igs025->m_kb_region = region;
	m_igs025->m_kb_game_id = region | (region << 8) | (region << 16) | (region << 24);

	uint16_t *mem16 = (uint16_t *)memregion("maincpu")->base();
	mem16[0x12f520 / 2] = 0x4e93;
	mem16[0x12f5c6 / 2] = 0x4e93;
	mem16[0x12f656 / 2] = 0x4e93;
}