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// license:BSD-3-Clause
// copyright-holders:Juergen Buchmueller
/***************************************************************************
z80daisy.h
Z80/180 daisy chaining support functions.
***************************************************************************/
#ifndef MAME_MACHINE_Z80DAISY_H
#define MAME_MACHINE_Z80DAISY_H
#pragma once
//**************************************************************************
// CONSTANTS
//**************************************************************************
// these constants are returned from the irq_state function
const uint8_t Z80_DAISY_INT = 0x01; // interrupt request mask
const uint8_t Z80_DAISY_IEO = 0x02; // interrupt disable mask (IEO)
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> z80_daisy_config
struct z80_daisy_config
{
const char * devname; // name of the device
};
// ======================> device_z80daisy_interface
class device_z80daisy_interface : public device_interface
{
friend class z80_daisy_chain_interface;
public:
// construction/destruction
device_z80daisy_interface(const machine_config &mconfig, device_t &device);
virtual ~device_z80daisy_interface();
// interface-level overrides
virtual void interface_post_start() override;
virtual void interface_post_reset() override;
// required operation overrides
virtual int z80daisy_irq_state() = 0;
virtual int z80daisy_irq_ack() = 0;
virtual void z80daisy_irq_reti() = 0;
// instruction decoding
void z80daisy_decode(uint8_t opcode);
private:
device_z80daisy_interface *m_daisy_next; // next device in the chain
uint8_t m_last_opcode;
};
// ======================> z80_daisy_chain_interface
class z80_daisy_chain_interface : public device_interface
{
public:
// construction/destruction
z80_daisy_chain_interface(const machine_config &mconfig, device_t &device);
virtual ~z80_daisy_chain_interface();
// configuration helpers
void set_daisy_config(const z80_daisy_config *config) { m_daisy_config = config; }
// getters
bool daisy_chain_present() const { return (m_chain != nullptr); }
std::string daisy_show_chain() const;
protected:
// interface-level overrides
virtual void interface_post_start() override;
virtual void interface_post_reset() override;
// initialization
void daisy_init(const z80_daisy_config *daisy);
// callbacks
int daisy_update_irq_state();
device_z80daisy_interface *daisy_get_irq_device();
void daisy_call_reti_device();
private:
const z80_daisy_config *m_daisy_config;
device_z80daisy_interface *m_chain; // head of the daisy chain
};
#endif // MAME_MACHINE_Z80DAISY_H
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