diff options
Diffstat (limited to 'trunk/src/emu/cpu/psx/rcnt.h')
-rw-r--r-- | trunk/src/emu/cpu/psx/rcnt.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/trunk/src/emu/cpu/psx/rcnt.h b/trunk/src/emu/cpu/psx/rcnt.h new file mode 100644 index 00000000000..759ee518fad --- /dev/null +++ b/trunk/src/emu/cpu/psx/rcnt.h @@ -0,0 +1,60 @@ +/* + * 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 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 ) + +typedef struct _psx_root psx_root; +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); + + WRITE32_MEMBER( write ); + READ32_MEMBER( read ); + +protected: + virtual void device_start(); + virtual void device_reset(); + virtual void device_post_load(); + +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 ); + void root_finished( void *ptr, int param ); +}; + +#endif |