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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert,Andreas Naive
#ifndef MAME_MACHINE_AWBOARD_H
#define MAME_MACHINE_AWBOARD_H
#pragma once
#include "naomig1.h"
class aw_rom_board : public naomi_g1_device
{
public:
aw_rom_board(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
virtual void submap(address_map &map) override;
DECLARE_WRITE16_MEMBER(epr_offsetl_w); // 5f7000
DECLARE_WRITE16_MEMBER(epr_offseth_w); // 5f7004
DECLARE_WRITE16_MEMBER(mpr_record_index_w); // 5f700c
DECLARE_WRITE16_MEMBER(mpr_first_file_index_w); // 5f7010
DECLARE_WRITE16_MEMBER(mpr_file_offsetl_w); // 5f7014
DECLARE_WRITE16_MEMBER(mpr_file_offseth_w); // 5f7018
DECLARE_READ16_MEMBER(pio_r); // 5f7080
DECLARE_WRITE16_MEMBER(pio_w); // 5f7080
protected:
virtual void device_start() override;
virtual void device_reset() override;
virtual void dma_get_position(uint8_t *&base, uint32_t &limit, bool to_mainram) override;
virtual void dma_advance(uint32_t size) override;
private:
enum { EPR, MPR_RECORD, MPR_FILE };
required_memory_region m_region;
uint8_t rombd_key;
uint32_t mpr_offset, mpr_bank;
uint32_t epr_offset, mpr_file_offset;
uint16_t mpr_record_index, mpr_first_file_index;
uint16_t decrypted_buf[16];
uint32_t dma_offset, dma_limit;
struct sbox_set {
uint8_t S0[32];
uint8_t S1[16];
uint8_t S2[16];
uint8_t S3[8];
};
static const int permutation_table[4][16];
static const sbox_set sboxes_table[4];
static const int xor_table[16];
static uint16_t decrypt(uint16_t cipherText, uint32_t address, const uint8_t key);
uint16_t decrypt16(uint32_t address) { return decrypt(m_region->as_u16(address), address, rombd_key); }
void recalc_dma_offset(int mode);
};
DECLARE_DEVICE_TYPE(AW_ROM_BOARD, aw_rom_board)
#endif // MAME_MACHINE_AWBOARD_H
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