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#pragma once
#ifndef __LR35902_H__
#define __LR35902_H__
#define MCFG_LR35902_CONFIG(_config) \
lr35902_cpu_device::static_set_config(*device, _config);
class lr35902_cpu_device;
// Perhaps replace this with a standard device callback
typedef void (*lr35902_timer_fired_func)(lr35902_cpu_device *device, int cycles);
struct lr35902_config
{
const UINT16 *c_regs;
UINT8 c_features;
lr35902_timer_fired_func c_timer_expired_func;
};
enum
{
LR35902_PC=1, LR35902_SP, LR35902_A, LR35902_F, LR35902_B, LR35902_C, LR35902_D, LR35902_E, LR35902_H, LR35902_L,
LR35902_IRQ_STATE,
/* Pseudo registers to keep track of the interrupt statuses */
LR35902_IE, LR35902_IF,
/* Pseudo register to change and check the cpu operating speed */
LR35902_SPEED,
};
// This and the features configuration could be removed if we introduce proper subclasses
#define LR35902_FEATURE_HALT_BUG 0x01
class lr35902_cpu_device : public cpu_device,
public lr35902_config
{
public:
// construction/destruction
lr35902_cpu_device(const machine_config &mconfig, const char *_tag, device_t *_owner, UINT32 _clock);
static void static_set_config(device_t &device, const lr35902_config &config);
UINT8 get_speed();
void set_speed( UINT8 speed_request );
UINT8 get_ie() { return m_IE; }
void set_ie( UINT8 data ) { m_IE = data; }
UINT8 get_if() { return m_IF; }
void set_if( UINT8 data ) { m_IF = data; }
protected:
// device-level overrides
virtual void device_start();
virtual void device_reset();
// device_execute_interface overrides
virtual UINT32 execute_min_cycles() const { return 1; }
virtual UINT32 execute_max_cycles() const { return 16; }
virtual UINT32 execute_input_lines() const { return 5; }
virtual void execute_run();
virtual void execute_set_input(int inputnum, int state);
// device_memory_interface overrides
virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const { return (spacenum == AS_PROGRAM) ? &m_program_config : NULL; }
// device_state_interface overrides
void state_string_export(const device_state_entry &entry, astring &string);
// device_disasm_interface overrides
virtual UINT32 disasm_min_opcode_bytes() const { return 1; }
virtual UINT32 disasm_max_opcode_bytes() const { return 4; }
virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options);
inline void cycles_passed(UINT8 cycles);
inline UINT8 mem_read_byte(UINT16 addr);
inline void mem_write_byte(UINT16 addr, UINT8 data);
inline UINT16 mem_read_word(UINT16 addr);
inline void mem_write_word(UINT16 addr, UINT16 data);
inline void check_interrupts();
protected:
address_space_config m_program_config;
UINT8 m_A;
UINT8 m_F;
UINT8 m_B;
UINT8 m_C;
UINT8 m_D;
UINT8 m_E;
UINT8 m_H;
UINT8 m_L;
UINT16 m_SP;
UINT16 m_PC;
/* Interrupt related */
UINT8 m_IE;
UINT8 m_IF;
int m_irq_state;
int m_ei_delay;
lr35902_cpu_device *m_device;
address_space *m_program;
int m_icount;
/* Timer stuff */
lr35902_timer_fired_func m_timer_expired_func;
/* Fetch & execute related */
int m_execution_state;
UINT8 m_op;
/* Others */
int m_gb_speed;
int m_gb_speed_change_pending;
int m_enable;
int m_doHALTbug;
UINT8 m_features;
const struct lr35902_config *m_config;
/* Flag bit definitions */
static const UINT8 FLAG_Z = 0x80;
static const UINT8 FLAG_N = 0x40;
static const UINT8 FLAG_H = 0x20;
static const UINT8 FLAG_C = 0x10;
};
extern const device_type LR35902;
#endif /* __LR35902_H__ */
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