diff options
Diffstat (limited to 'gme/gb_cpu_io.h')
-rw-r--r-- | gme/gb_cpu_io.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/gme/gb_cpu_io.h b/gme/gb_cpu_io.h new file mode 100644 index 00000000..ada99ead --- /dev/null +++ b/gme/gb_cpu_io.h @@ -0,0 +1,72 @@ + +#include "Gbs_Emu.h" + +#include "blargg_source.h" + +int Gbs_Emu::cpu_read( gb_addr_t addr ) +{ + int result = *cpu::get_code( addr ); + if ( unsigned (addr - Gb_Apu::start_addr) < Gb_Apu::register_count ) + result = apu.read_register( clock(), addr ); +#ifndef NDEBUG + else if ( unsigned (addr - 0x8000) < 0x2000 || unsigned (addr - 0xE000) < 0x1F00 ) + dprintf( "Read from unmapped memory $%.4x\n", (unsigned) addr ); + else if ( unsigned (addr - 0xFF01) < 0xFF80 - 0xFF01 ) + dprintf( "Unhandled I/O read 0x%4X\n", (unsigned) addr ); +#endif + return result; +} + +void Gbs_Emu::cpu_write( gb_addr_t addr, int data ) +{ + unsigned offset = addr - ram_addr; + if ( offset <= 0xFFFF - ram_addr ) + { + ram [offset] = data; + if ( (addr ^ 0xE000) <= 0x1F80 - 1 ) + { + if ( unsigned (addr - Gb_Apu::start_addr) < Gb_Apu::register_count ) + { + GME_APU_HOOK( this, addr - Gb_Apu::start_addr, data ); + apu.write_register( clock(), addr, data ); + } + else if ( (addr ^ 0xFF06) < 2 ) + update_timer(); + else if ( addr == joypad_addr ) + ram [offset] = 0; // keep joypad return value 0 + else + ram [offset] = 0xFF; + + //if ( addr == 0xFFFF ) + // dprintf( "Wrote interrupt mask\n" ); + } + } + else if ( (addr ^ 0x2000) <= 0x2000 - 1 ) + { + set_bank( data ); + } +#ifndef NDEBUG + else if ( unsigned (addr - 0x8000) < 0x2000 || unsigned (addr - 0xE000) < 0x1F00 ) + { + dprintf( "Wrote to unmapped memory $%.4x\n", (unsigned) addr ); + } +#endif +} + +#define CPU_READ_FAST( cpu, addr, time, out ) \ + CPU_READ_FAST_( STATIC_CAST(Gbs_Emu*,cpu), addr, time, out ) + +#define CPU_READ_FAST_( emu, addr, time, out ) \ +{\ + out = READ_PROG( addr );\ + if ( unsigned (addr - Gb_Apu::start_addr) <= Gb_Apu::register_count )\ + out = emu->apu.read_register( emu->cpu_time - time * clocks_per_instr, addr );\ + else\ + check( out == emu->cpu_read( addr ) );\ +} + +#define CPU_READ( cpu, addr, time ) \ + STATIC_CAST(Gbs_Emu*,cpu)->cpu_read( addr ) + +#define CPU_WRITE( cpu, addr, data, time ) \ + STATIC_CAST(Gbs_Emu*,cpu)->cpu_write( addr, data ) |