diff options
Diffstat (limited to 'plugins/gme/Game_Music_Emu-0.5.2/gme/Spc_Cpu.h')
| -rw-r--r-- | plugins/gme/Game_Music_Emu-0.5.2/gme/Spc_Cpu.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/plugins/gme/Game_Music_Emu-0.5.2/gme/Spc_Cpu.h b/plugins/gme/Game_Music_Emu-0.5.2/gme/Spc_Cpu.h new file mode 100644 index 00000000..2252663b --- /dev/null +++ b/plugins/gme/Game_Music_Emu-0.5.2/gme/Spc_Cpu.h @@ -0,0 +1,57 @@ +// Super Nintendo (SNES) SPC-700 CPU emulator + +// Game_Music_Emu 0.5.2 +#ifndef SPC_CPU_H +#define SPC_CPU_H + +#include "blargg_common.h" + +typedef unsigned spc_addr_t; +typedef blargg_long spc_time_t; + +class Snes_Spc; + +class Spc_Cpu { + typedef BOOST::uint8_t uint8_t; + uint8_t* const ram; +public: + // Keeps pointer to 64K RAM + Spc_Cpu( Snes_Spc* spc, uint8_t* ram ); + + // SPC-700 registers. *Not* kept updated during a call to run(). + struct registers_t { + long pc; // more than 16 bits to allow overflow detection + uint8_t a; + uint8_t x; + uint8_t y; + uint8_t status; + uint8_t sp; + } r; + + // Run CPU for at least 'count' cycles. Return the number of cycles remaining + // when emulation stopped (negative if extra cycles were emulated). Emulation + // stops when there are no more remaining cycles or an unhandled instruction + // is encountered (STOP, SLEEP, and any others not yet implemented). In the + // latter case, the return value is greater than zero. + spc_time_t run( spc_time_t count ); + + // Number of clock cycles remaining for current run() call + spc_time_t remain() const; + + // Access memory as the emulated CPU does + int read ( spc_addr_t ); + void write( spc_addr_t, int ); + +private: + // noncopyable + Spc_Cpu( const Spc_Cpu& ); + Spc_Cpu& operator = ( const Spc_Cpu& ); + unsigned mem_bit( spc_addr_t ); + + spc_time_t remain_; + Snes_Spc& emu; +}; + +inline spc_time_t Spc_Cpu::remain() const { return remain_; } + +#endif |