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Diffstat (limited to 'src/devices/cpu/psx/rcnt.h')
-rw-r--r-- | src/devices/cpu/psx/rcnt.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/src/devices/cpu/psx/rcnt.h b/src/devices/cpu/psx/rcnt.h new file mode 100644 index 00000000000..4cdae90276a --- /dev/null +++ b/src/devices/cpu/psx/rcnt.h @@ -0,0 +1,76 @@ +// license:BSD-3-Clause +// copyright-holders:smf +/* + * PlayStation Root Counter emulator + * + * Copyright 2003-2011 smf + * + */ + +#pragma once + +#ifndef __PSXRCNT_H__ +#define __PSXRCNT_H__ + +#include "emu.h" + +extern const device_type PSX_RCNT; + +#define MCFG_PSX_RCNT_IRQ0_HANDLER(_devcb) \ + devcb = &psxrcnt_device::set_irq0_handler(*device, DEVCB_##_devcb); +#define MCFG_PSX_RCNT_IRQ1_HANDLER(_devcb) \ + devcb = &psxrcnt_device::set_irq1_handler(*device, DEVCB_##_devcb); +#define MCFG_PSX_RCNT_IRQ2_HANDLER(_devcb) \ + devcb = &psxrcnt_device::set_irq2_handler(*device, DEVCB_##_devcb); +#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 ) + +struct psx_root +{ + emu_timer *timer; + UINT16 n_count; + UINT16 n_mode; + UINT16 n_target; + UINT64 n_start; +}; + +class psxrcnt_device : public device_t +{ +public: + psxrcnt_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + + // static configuration helpers + template<class _Object> static devcb_base &set_irq0_handler(device_t &device, _Object object) { return downcast<psxrcnt_device &>(device).m_irq0_handler.set_callback(object); } + template<class _Object> static devcb_base &set_irq1_handler(device_t &device, _Object object) { return downcast<psxrcnt_device &>(device).m_irq1_handler.set_callback(object); } + template<class _Object> static devcb_base &set_irq2_handler(device_t &device, _Object object) { return downcast<psxrcnt_device &>(device).m_irq2_handler.set_callback(object); } + + DECLARE_WRITE32_MEMBER( write ); + DECLARE_READ32_MEMBER( read ); + +protected: + virtual void device_start(); + virtual void device_reset(); + virtual void device_post_load(); + virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr); + +private: + psx_root root_counter[ 3 ]; + + UINT64 gettotalcycles( void ); + int root_divider( int n_counter ); + UINT16 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 |