mirror of
https://github.com/ZDoom/gzdoom.git
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102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
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#include "Hes_Emu.h"
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#include "blargg_source.h"
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int Hes_Emu::cpu_read( hes_addr_t addr )
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{
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check( addr <= 0xFFFF );
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int result = *cpu::get_code( addr );
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if ( mmr [addr >> page_shift] == 0xFF )
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result = cpu_read_( addr );
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return result;
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}
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void Hes_Emu::cpu_write( hes_addr_t addr, int data )
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{
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check( addr <= 0xFFFF );
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byte* out = write_pages [addr >> page_shift];
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addr &= page_size - 1;
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if ( out )
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out [addr] = data;
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else if ( mmr [addr >> page_shift] == 0xFF )
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cpu_write_( addr, data );
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}
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inline byte const* Hes_Emu::cpu_set_mmr( int page, int bank )
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{
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write_pages [page] = 0;
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if ( bank < 0x80 )
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return rom.at_addr( bank * (blargg_long) page_size );
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byte* data = 0;
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switch ( bank )
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{
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case 0xF8:
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data = cpu::ram;
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break;
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case 0xF9:
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case 0xFA:
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case 0xFB:
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data = &sgx [(bank - 0xF9) * page_size];
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break;
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default:
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if ( bank != 0xFF )
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dprintf( "Unmapped bank $%02X\n", bank );
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return rom.unmapped();
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}
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write_pages [page] = data;
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return data;
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}
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#define CPU_READ_FAST( cpu, addr, time, out ) \
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CPU_READ_FAST_( STATIC_CAST(Hes_Emu*,cpu), addr, time, out )
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#define CPU_READ_FAST_( cpu, addr, time, out ) \
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{\
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out = READ_PROG( addr );\
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if ( mmr [addr >> page_shift] == 0xFF )\
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{\
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FLUSH_TIME();\
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out = cpu->cpu_read_( addr );\
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CACHE_TIME();\
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}\
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}
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#define CPU_WRITE_FAST( cpu, addr, data, time ) \
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CPU_WRITE_FAST_( STATIC_CAST(Hes_Emu*,cpu), addr, data, time )
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#define CPU_WRITE_FAST_( cpu, addr, data, time ) \
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{\
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byte* out = cpu->write_pages [addr >> page_shift];\
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addr &= page_size - 1;\
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if ( out )\
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{\
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out [addr] = data;\
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}\
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else if ( mmr [addr >> page_shift] == 0xFF )\
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{\
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FLUSH_TIME();\
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cpu->cpu_write_( addr, data );\
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CACHE_TIME();\
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}\
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}
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#define CPU_READ( cpu, addr, time ) \
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STATIC_CAST(Hes_Emu*,cpu)->cpu_read( addr )
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#define CPU_WRITE( cpu, addr, data, time ) \
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STATIC_CAST(Hes_Emu*,cpu)->cpu_write( addr, data )
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#define CPU_WRITE_VDP( cpu, addr, data, time ) \
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STATIC_CAST(Hes_Emu*,cpu)->cpu_write_vdp( addr, data )
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#define CPU_SET_MMR( cpu, page, bank ) \
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STATIC_CAST(Hes_Emu*,cpu)->cpu_set_mmr( page, bank )
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#define CPU_DONE( cpu, time, result_out ) \
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result_out = STATIC_CAST(Hes_Emu*,cpu)->cpu_done()
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