80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
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/*
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* m4cartridge.h
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*
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* Created on: Nov 5, 2018
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* Author: flyinghead
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* Plagiarized from mame (mame/src/mame/machine/naomim4.h)
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* // license:BSD-3-Clause
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* // copyright-holders:Olivier Galibert,Andreas Naive
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*
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*/
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#ifndef CORE_HW_NAOMI_M4CARTRIDGE_H_
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#define CORE_HW_NAOMI_M4CARTRIDGE_H_
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#include "naomi_cart.h"
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#include "naomi_regs.h"
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class M4Cartridge: public NaomiCartridge {
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public:
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M4Cartridge(u32 size) : NaomiCartridge(size) { }
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~M4Cartridge();
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virtual u32 ReadMem(u32 address, u32 size) override
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{
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if ((address & 0xff) == 0x34)
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return m4id & 0xff80;
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u32 data = NaomiCartridge::ReadMem(address, size);
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if ((address & 0xff) == (NAOMI_ROM_OFFSETH_addr & 0xff))
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// indicates that security PIC is present
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data |= 0x2000;
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return data;
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}
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virtual bool Read(u32 offset, u32 size, void *dst) override;
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virtual bool Write(u32 offset, u32 size, u32 data) override;
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virtual void* GetDmaPtr(u32 &size) override;
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virtual void AdvancePtr(u32 size) override;
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void SetM4Id(u16 m4id) { this->m4id = m4id; }
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void SetKeyData(u8 *key_data)
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{
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this->m_key_data = key_data;
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// FIXME not the best place to do this
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device_start();
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device_reset();
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}
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protected:
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virtual void DmaOffsetChanged(u32 dma_offset) override;
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virtual void PioOffsetChanged(u32 pio_offset) override;
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private:
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void device_start();
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void device_reset();
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static const u8 k_sboxes[4][16];
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u16 m4id;
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u8 *m_key_data; // 2048 bytes
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u16 subkey1, subkey2;
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u16 one_round[0x10000];
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u8 buffer[32768];
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u32 rom_cur_address, buffer_actual_size;
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u16 iv;
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u8 counter;
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bool encryption;
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bool cfi_mode;
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void enc_init();
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void enc_reset();
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void enc_fill();
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u16 decrypt_one_round(u16 word, u16 subkey);
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};
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#endif /* CORE_HW_NAOMI_M4CARTRIDGE_H_ */
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