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[SNES]: fixed a GDMA boundary bug

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This commit is contained in:
Angelo Salese 2009-08-15 00:09:08 +00:00
parent 417069088f
commit fd4684ace5
1 changed files with 25 additions and 24 deletions
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49
src/mame/machine/snes.c
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@ -2133,7 +2133,7 @@ void snes_gdma( const address_space *space, UINT8 channels )
UINT8 mask = 1, dma = 0, i;
INT8 increment;
UINT16 bbus;
UINT32 abus, length;
UINT32 abus, abus_bank, length;
/* Assume priority of the 8 DMA channels is 0-7 */
for( i = 0; i < 8; i++ )
@ -2141,7 +2141,8 @@ void snes_gdma( const address_space *space, UINT8 channels )
if( channels & mask )
{
/* Find transfer addresses */
abus = (snes_ram[SNES_DMA_BASE + dma + 4] << 16) + (snes_ram[SNES_DMA_BASE + dma + 3] << 8) + snes_ram[SNES_DMA_BASE + dma + 2];
abus = (snes_ram[SNES_DMA_BASE + dma + 3] << 8) + snes_ram[SNES_DMA_BASE + dma + 2];
abus_bank = (snes_ram[SNES_DMA_BASE + dma + 4] << 16);
bbus = 0x2100 + snes_ram[SNES_DMA_BASE + dma + 1];
/* Auto increment */
@ -2175,9 +2176,9 @@ void snes_gdma( const address_space *space, UINT8 channels )
while( length-- )
{
if( snes_ram[SNES_DMA_BASE + dma] & 0x80 ) /* PPU->CPU */
memory_write_byte(space, abus, memory_read_byte(space, bbus) );
memory_write_byte(space, ((abus & 0xffff) | (abus_bank)), memory_read_byte(space, bbus) );
else /* CPU->PPU */
memory_write_byte(space, bbus, memory_read_byte(space, abus) );
memory_write_byte(space, bbus, memory_read_byte(space, ((abus & 0xffff) | (abus_bank))) );
abus += increment;
}
} break;
@ -2187,16 +2188,16 @@ void snes_gdma( const address_space *space, UINT8 channels )
while( length-- )
{
if( snes_ram[SNES_DMA_BASE + dma] & 0x80 ) /* PPU->CPU */
memory_write_byte(space, abus, memory_read_byte(space, bbus) );
memory_write_byte(space, ((abus & 0xffff) | (abus_bank)), memory_read_byte(space, bbus) );
else /* CPU->PPU */
memory_write_byte(space, bbus, memory_read_byte(space, abus) );
memory_write_byte(space, bbus, memory_read_byte(space, ((abus & 0xffff) | (abus_bank))) );
abus += increment;
if( !(length--) )
break;
if( snes_ram[SNES_DMA_BASE + dma] & 0x80 ) /* PPU->CPU */
memory_write_byte(space, abus, memory_read_byte(space, bbus + 1) );
memory_write_byte(space, ((abus & 0xffff) | (abus_bank)), memory_read_byte(space, bbus + 1) );
else /* CPU->PPU */
memory_write_byte(space, bbus + 1, memory_read_byte(space, abus) );
memory_write_byte(space, bbus + 1, memory_read_byte(space, ((abus & 0xffff) | (abus_bank))) );
abus += increment;
}
} break;
@ -2206,30 +2207,30 @@ void snes_gdma( const address_space *space, UINT8 channels )
while( length-- )
{
if( snes_ram[SNES_DMA_BASE + dma] & 0x80 ) /* PPU->CPU */
memory_write_byte(space, abus, memory_read_byte(space, bbus) );
memory_write_byte(space, ((abus & 0xffff) | (abus_bank)), memory_read_byte(space, bbus) );
else /* CPU->PPU */
memory_write_byte(space, bbus, memory_read_byte(space, abus) );
memory_write_byte(space, bbus, memory_read_byte(space, ((abus & 0xffff) | (abus_bank))) );
abus += increment;
if( !(length--) )
break;
if( snes_ram[SNES_DMA_BASE + dma] & 0x80 ) /* PPU->CPU */
memory_write_byte(space, abus, memory_read_byte(space, bbus) );
memory_write_byte(space, ((abus & 0xffff) | (abus_bank)), memory_read_byte(space, bbus) );
else /* CPU->PPU */
memory_write_byte(space, bbus, memory_read_byte(space, abus) );
memory_write_byte(space, bbus, memory_read_byte(space, ((abus & 0xffff) | (abus_bank))) );
abus += increment;
if( !(length--) )
break;
if( snes_ram[SNES_DMA_BASE + dma] & 0x80 ) /* PPU->CPU */
memory_write_byte(space, abus, memory_read_byte(space, bbus + 1) );
memory_write_byte(space, ((abus & 0xffff) | (abus_bank)), memory_read_byte(space, bbus + 1) );
else /* CPU->PPU */
memory_write_byte(space, bbus + 1, memory_read_byte(space, abus) );
memory_write_byte(space, bbus + 1, memory_read_byte(space, ((abus & 0xffff) | (abus_bank))) );
abus += increment;
if( !(length--) )
break;
if( snes_ram[SNES_DMA_BASE + dma] & 0x80 ) /* PPU->CPU */
memory_write_byte(space, abus, memory_read_byte(space, bbus + 1) );
memory_write_byte(space, ((abus & 0xffff) | (abus_bank)), memory_read_byte(space, bbus + 1) );
else /* CPU->PPU */
memory_write_byte(space, bbus + 1, memory_read_byte(space, abus) );
memory_write_byte(space, bbus + 1, memory_read_byte(space, ((abus & 0xffff) | (abus_bank))) );
abus += increment;
}
} break;
@ -2238,30 +2239,30 @@ void snes_gdma( const address_space *space, UINT8 channels )
while( length-- )
{
if( snes_ram[SNES_DMA_BASE + dma] & 0x80 ) /* PPU->CPU */
memory_write_byte(space, abus, memory_read_byte(space, bbus) );
memory_write_byte(space, ((abus & 0xffff) | (abus_bank)), memory_read_byte(space, bbus) );
else /* CPU->PPU */
memory_write_byte(space, bbus, memory_read_byte(space, abus) );
memory_write_byte(space, bbus, memory_read_byte(space, ((abus & 0xffff) | (abus_bank))) );
abus += increment;
if( !(length--) )
break;
if( snes_ram[SNES_DMA_BASE + dma] & 0x80 ) /* PPU->CPU */
memory_write_byte(space, abus, memory_read_byte(space, bbus + 1) );
memory_write_byte(space, ((abus & 0xffff) | (abus_bank)), memory_read_byte(space, bbus + 1) );
else /* CPU->PPU */
memory_write_byte(space, bbus + 1, memory_read_byte(space, abus) );
memory_write_byte(space, bbus + 1, memory_read_byte(space, ((abus & 0xffff) | (abus_bank))) );
abus += increment;
if( !(length--) )
break;
if( snes_ram[SNES_DMA_BASE + dma] & 0x80 ) /* PPU->CPU */
memory_write_byte(space, abus, memory_read_byte(space, bbus + 2) );
memory_write_byte(space, ((abus & 0xffff) | (abus_bank)), memory_read_byte(space, bbus + 2) );
else /* CPU->PPU */
memory_write_byte(space, bbus + 2, memory_read_byte(space, abus) );
memory_write_byte(space, bbus + 2, memory_read_byte(space, ((abus & 0xffff) | (abus_bank))) );
abus += increment;
if( !(length--) )
break;
if( snes_ram[SNES_DMA_BASE + dma] & 0x80 ) /* PPU->CPU */
memory_write_byte(space, abus, memory_read_byte(space, bbus + 3) );
memory_write_byte(space, ((abus & 0xffff) | (abus_bank)), memory_read_byte(space, bbus + 3) );
else /* CPU->PPU */
memory_write_byte(space, bbus + 3, memory_read_byte(space, abus) );
memory_write_byte(space, bbus + 3, memory_read_byte(space, ((abus & 0xffff) | (abus_bank))) );
abus += increment;
}
} break;