qzdoom/libraries/game-music-emu/gme/hes_cpu_io.h

#include "Hes_Emu.h"

#include "blargg_source.h"

int Hes_Emu::cpu_read( hes_addr_t addr )
{
	check( addr <= 0xFFFF );
	int result = *cpu::get_code( addr );
	if ( mmr [addr >> page_shift] == 0xFF )
		result = cpu_read_( addr );
	return result;
}

void Hes_Emu::cpu_write( hes_addr_t addr, int data )
{
	check( addr <= 0xFFFF );
	byte* out = write_pages [addr >> page_shift];
	addr &= page_size - 1;
	if ( out )
		out [addr] = data;
	else if ( mmr [addr >> page_shift] == 0xFF )
		cpu_write_( addr, data );
}

inline byte const* Hes_Emu::cpu_set_mmr( int page, int bank )
{
	write_pages [page] = 0;
	if ( bank < 0x80 )
		return rom.at_addr( bank * (blargg_long) page_size );
	
	byte* data = 0;
	switch ( bank )
	{
		case 0xF8:
			data = cpu::ram;
			break;
		
		case 0xF9:
		case 0xFA:
		case 0xFB:
			data = &sgx [(bank - 0xF9) * page_size];
			break;
		
		default:
			if ( bank != 0xFF )
				debug_printf( "Unmapped bank $%02X\n", bank );
			return rom.unmapped();
	}
	
	write_pages [page] = data;
	return data;
}

#define CPU_READ_FAST( cpu, addr, time, out ) \
	CPU_READ_FAST_( STATIC_CAST(Hes_Emu*,cpu), addr, time, out )

#define CPU_READ_FAST_( cpu, addr, time, out ) \
{\
	out = READ_PROG( addr );\
	if ( mmr [addr >> page_shift] == 0xFF )\
	{\
		FLUSH_TIME();\
		out = cpu->cpu_read_( addr );\
		CACHE_TIME();\
	}\
}

#define CPU_WRITE_FAST( cpu, addr, data, time ) \
	CPU_WRITE_FAST_( STATIC_CAST(Hes_Emu*,cpu), addr, data, time )

#define CPU_WRITE_FAST_( cpu, addr, data, time ) \
{\
	byte* out = cpu->write_pages [addr >> page_shift];\
	addr &= page_size - 1;\
	if ( out )\
	{\
		out [addr] = data;\
	}\
	else if ( mmr [addr >> page_shift] == 0xFF )\
	{\
		FLUSH_TIME();\
		cpu->cpu_write_( addr, data );\
		CACHE_TIME();\
	}\
}

#define CPU_READ( cpu, addr, time ) \
	STATIC_CAST(Hes_Emu*,cpu)->cpu_read( addr )

#define CPU_WRITE( cpu, addr, data, time ) \
	STATIC_CAST(Hes_Emu*,cpu)->cpu_write( addr, data )

#define CPU_WRITE_VDP( cpu, addr, data, time ) \
	STATIC_CAST(Hes_Emu*,cpu)->cpu_write_vdp( addr, data )

#define CPU_SET_MMR( cpu, page, bank ) \
	STATIC_CAST(Hes_Emu*,cpu)->cpu_set_mmr( page, bank )

#define CPU_DONE( cpu, time, result_out ) \
	result_out = STATIC_CAST(Hes_Emu*,cpu)->cpu_done()