// license:BSD-3-Clause // copyright-holders:smf /* * PlayStation Root Counter emulator * * Copyright 2003-2011 smf * */ #ifndef MAME_CPU_PSX_RCNT_H #define MAME_CPU_PSX_RCNT_H #pragma once DECLARE_DEVICE_TYPE(PSX_RCNT, psxrcnt_device) #define PSX_RC_STOP ( 0x01 ) #define PSX_RC_RESET ( 0x04 ) /* guess */ #define PSX_RC_COUNTTARGET ( 0x08 ) #define PSX_RC_IRQTARGET ( 0x10 ) #define PSX_RC_IRQOVERFLOW ( 0x20 ) #define PSX_RC_REPEAT ( 0x40 ) #define PSX_RC_CLC ( 0x100 ) #define PSX_RC_DIV ( 0x200 ) #define PSX_RC_REACHEDTARGET ( 0x800 ) #define PSX_RC_REACHEDFFFF ( 0x1000 ) class psxrcnt_device : public device_t { public: psxrcnt_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); // configuration helpers auto irq0() { return m_irq0_handler.bind(); } auto irq1() { return m_irq1_handler.bind(); } auto irq2() { return m_irq2_handler.bind(); } void write(offs_t offset, uint32_t data, uint32_t mem_mask = ~0); uint32_t read(offs_t offset, uint32_t mem_mask = ~0); protected: virtual void device_start() override ATTR_COLD; virtual void device_reset() override ATTR_COLD; virtual void device_post_load() override; TIMER_CALLBACK_MEMBER( timer_update ); private: struct psx_root { emu_timer *timer; uint16_t n_count; uint16_t n_mode; uint16_t n_target; uint64_t n_start; }; psx_root root_counter[ 3 ]; uint64_t gettotalcycles( void ); int root_divider( int n_counter ); uint16_t root_current( int n_counter ); int root_target( int n_counter ); void root_timer_adjust( int n_counter ); devcb_write_line m_irq0_handler; devcb_write_line m_irq1_handler; devcb_write_line m_irq2_handler; }; #endif // MAME_CPU_PSX_RCNT_H