mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-12-25 10:41:49 +01:00
[Core/SCD] improved emulation accuracy of mirrored memory areas
This commit is contained in:
EkeEke
parent
c478c6026a
commit
5a3d4655ba
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569
core/cd_hw/scd.c
569
core/cd_hw/scd.c
@ -82,10 +82,10 @@ void prg_ram_dma_w(unsigned int words)
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/* CDC buffer source address */
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uint16 src_index = cdc.dac.w & 0x3ffe;
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/* PRG-RAM destination address*/
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uint32 dst_index = (scd.regs[0x0a>>1].w << 3) & 0x7fffe;
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/* update DMA destination address */
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scd.regs[0x0a>>1].w += (words >> 2);
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@ -149,13 +149,227 @@ static void prg_ram_write_word(unsigned int address, unsigned int data)
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#endif
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}
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/*--------------------------------------------------------------------------*/
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/* PRG-RAM bank mirrored access */
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/*--------------------------------------------------------------------------*/
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static unsigned int prg_ram_z80_read_byte(unsigned int address)
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{
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int offset = (address >> 16) & 0x03;
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if (zbank_memory_map[offset].read)
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{
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return zbank_memory_map[offset].read(address);
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}
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return READ_BYTE(m68k.memory_map[offset].base, address & 0xffff);
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}
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static void prg_ram_z80_write_byte(unsigned int address, unsigned int data)
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{
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int offset = (address >> 16) & 0x03;
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if (zbank_memory_map[offset].write)
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{
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zbank_memory_map[offset].write(address, data);
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}
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else
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{
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WRITE_BYTE(m68k.memory_map[offset].base, address & 0xffff, data);
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}
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}
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static unsigned int prg_ram_m68k_read_byte(unsigned int address)
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{
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int offset = (address >> 16) & 0x03;
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if (m68k.memory_map[offset].read8)
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{
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return m68k.memory_map[offset].read8(address);
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}
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return READ_BYTE(m68k.memory_map[offset].base, address & 0xffff);
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}
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static unsigned int prg_ram_m68k_read_word(unsigned int address)
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{
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int offset = (address >> 16) & 0x03;
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if (m68k.memory_map[offset].read16)
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{
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return m68k.memory_map[offset].read16(address);
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}
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return *(uint16 *)(m68k.memory_map[offset].base + (address & 0xffff));
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}
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static void prg_ram_m68k_write_byte(unsigned int address, unsigned int data)
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{
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int offset = (address >> 16) & 0x03;
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if (m68k.memory_map[offset].write8)
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{
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m68k.memory_map[offset].write8(address, data);
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}
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else
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{
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WRITE_BYTE(m68k.memory_map[offset].base, address & 0xffff, data);
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}
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}
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static void prg_ram_m68k_write_word(unsigned int address, unsigned int data)
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{
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int offset = (address >> 16) & 0x03;
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if (m68k.memory_map[offset].write16)
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{
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m68k.memory_map[offset].write16(address, data);
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}
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else
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{
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*(uint16 *)(m68k.memory_map[offset].base + (address & 0xffff)) = data;
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}
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}
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/*--------------------------------------------------------------------------*/
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/* Word-RAM bank mirrored access */
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/*--------------------------------------------------------------------------*/
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static unsigned int word_ram_z80_read_byte(unsigned int address)
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{
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int offset = (address >> 16) & 0x23;
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if (zbank_memory_map[offset].read)
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{
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return zbank_memory_map[offset].read(address);
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}
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return READ_BYTE(m68k.memory_map[offset].base, address & 0xffff);
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}
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static void word_ram_z80_write_byte(unsigned int address, unsigned int data)
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{
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int offset = (address >> 16) & 0x23;
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if (zbank_memory_map[offset].write)
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{
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zbank_memory_map[offset].write(address, data);
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}
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else
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{
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WRITE_BYTE(m68k.memory_map[offset].base, address & 0xffff, data);
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}
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}
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static unsigned int word_ram_m68k_read_byte(unsigned int address)
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{
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int offset = (address >> 16) & 0x23;
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if (m68k.memory_map[offset].read8)
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{
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return m68k.memory_map[offset].read8(address);
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}
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return READ_BYTE(m68k.memory_map[offset].base, address & 0xffff);
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}
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static unsigned int word_ram_m68k_read_word(unsigned int address)
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{
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int offset = (address >> 16) & 0x23;
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if (m68k.memory_map[offset].read16)
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{
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return m68k.memory_map[offset].read16(address);
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}
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return *(uint16 *)(m68k.memory_map[offset].base + (address & 0xffff));
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}
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static void word_ram_m68k_write_byte(unsigned int address, unsigned int data)
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{
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int offset = (address >> 16) & 0x23;
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if (m68k.memory_map[offset].write8)
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{
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m68k.memory_map[offset].write8(address, data);
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}
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else
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{
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WRITE_BYTE(m68k.memory_map[offset].base, address & 0xffff, data);
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}
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}
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static void word_ram_m68k_write_word(unsigned int address, unsigned int data)
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{
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int offset = (address >> 16) & 0x23;
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if (m68k.memory_map[offset].write16)
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{
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m68k.memory_map[offset].write16(address, data);
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}
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else
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{
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*(uint16 *)(m68k.memory_map[offset].base + (address & 0xffff)) = data;
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}
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}
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static unsigned int word_ram_s68k_read_byte(unsigned int address)
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{
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int offset = (address >> 16) & 0x0f;
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if (s68k.memory_map[offset].read8)
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{
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return s68k.memory_map[offset].read8(address);
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}
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return READ_BYTE(s68k.memory_map[offset].base, address & 0xffff);
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}
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static unsigned int word_ram_s68k_read_word(unsigned int address)
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{
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int offset = (address >> 16) & 0x0f;
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if (s68k.memory_map[offset].read16)
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{
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return s68k.memory_map[offset].read16(address);
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}
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return *(uint16 *)(s68k.memory_map[offset].base + (address & 0xffff));
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}
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static void word_ram_s68k_write_byte(unsigned int address, unsigned int data)
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{
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int offset = (address >> 16) & 0x0f;
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if (s68k.memory_map[offset].write8)
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{
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s68k.memory_map[offset].write8(address, data);
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}
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else
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{
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WRITE_BYTE(s68k.memory_map[offset].base, address & 0xffff, data);
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}
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}
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static void word_ram_s68k_write_word(unsigned int address, unsigned int data)
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{
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int offset = (address >> 16) & 0x0f;
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if (s68k.memory_map[offset].write16)
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{
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s68k.memory_map[offset].write16(address, data);
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}
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else
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{
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*(uint16 *)(s68k.memory_map[offset].base + (address & 0xffff)) = data;
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}
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}
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/*--------------------------------------------------------------------------*/
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/* internal backup RAM (8KB) */
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/*--------------------------------------------------------------------------*/
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static unsigned int bram_read_byte(unsigned int address)
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{
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/* LSB only */
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if (address & 1)
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if (address & 0x01)
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{
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return scd.bram[(address >> 1) & 0x1fff];
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}
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@ -171,7 +385,7 @@ static unsigned int bram_read_word(unsigned int address)
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static void bram_write_byte(unsigned int address, unsigned int data)
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{
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/* LSB only */
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if (address & 1)
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if (address & 0x01)
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{
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scd.bram[(address >> 1) & 0x1fff] = data;
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}
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@ -183,7 +397,7 @@ static void bram_write_word(unsigned int address, unsigned int data)
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}
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/*--------------------------------------------------------------------------*/
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/* PCM chip & Gate-Array area */
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/* SUB-CPU polling detection and MAIN-CPU synchronization */
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/*--------------------------------------------------------------------------*/
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static void s68k_poll_detect(unsigned int reg_mask)
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@ -255,6 +469,10 @@ static void s68k_poll_sync(unsigned int reg_mask)
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m68k.poll.detected &= ~reg_mask;
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}
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/*--------------------------------------------------------------------------*/
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/* PCM chip & Gate-Array area */
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/*--------------------------------------------------------------------------*/
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static unsigned int scd_read_byte(unsigned int address)
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{
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/* PCM area (8K) is mirrored into $FF0000-$FF7FFF */
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@ -310,7 +528,7 @@ static unsigned int scd_read_byte(unsigned int address)
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#endif
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return data;
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}
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/* LED status */
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if (address == 0xff8000)
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{
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@ -330,7 +548,7 @@ static unsigned int scd_read_byte(unsigned int address)
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{
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/* shifted 4-bit input (xxxx00) */
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uint8 bits = (scd.regs[0x4e>>1].w >> (((address & 6) ^ 6) << 1)) << 2;
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/* color code */
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uint8 code = scd.regs[0x4c>>1].byte.l;
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@ -411,7 +629,7 @@ static unsigned int scd_read_word(unsigned int address)
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{
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/* shifted 4-bit input (xxxx00) */
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uint8 bits = (scd.regs[0x4e>>1].w >> (((address & 6) ^ 6) << 1)) << 2;
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/* color code */
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uint8 code = scd.regs[0x4c>>1].byte.l;
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@ -474,11 +692,15 @@ INLINE void word_ram_switch(uint8 mode)
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*ptr1++=*ptr3++;
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}
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/* allow Word-RAM access from both CPU in 2M mode (fixes sync issues in Mortal Kombat) */
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for (i=scd.cartridge.boot+0x20; i<scd.cartridge.boot+0x24; i++)
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/* MAIN-CPU: $200000-$21FFFF is mapped to 256K Word-RAM (lower 128K) */
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for (i=scd.cartridge.boot+0x20; i<scd.cartridge.boot+0x22; i++)
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{
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m68k.memory_map[i].base = scd.word_ram_2M + ((i & 0x03) << 16);
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}
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/* MAIN-CPU: $220000-$23FFFF is mapped to 256K Word-RAM (upper 128K) */
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for (i=scd.cartridge.boot+0x22; i<scd.cartridge.boot+0x24; i++)
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{
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/* MAIN-CPU: $200000-$23FFFF is mapped to 256K Word-RAM */
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m68k.memory_map[i].base = scd.word_ram_2M + ((i & 0x03) << 16);
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m68k.memory_map[i].read8 = NULL;
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m68k.memory_map[i].read16 = NULL;
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m68k.memory_map[i].write8 = NULL;
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@ -487,18 +709,18 @@ INLINE void word_ram_switch(uint8 mode)
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zbank_memory_map[i].write = NULL;
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}
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/* SUB-CPU: $080000-$0BFFFF is mapped to 256K Word-RAM */
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for (i=0x08; i<0x0c; i++)
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{
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/* SUB-CPU: $080000-$0BFFFF is mapped to 256K Word-RAM */
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s68k.memory_map[i].read8 = NULL;
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s68k.memory_map[i].read16 = NULL;
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s68k.memory_map[i].write8 = NULL;
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s68k.memory_map[i].write16 = NULL;
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}
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/* SUB-CPU: $0C0000-$0DFFFF is unmapped */
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for (i=0x0c; i<0x0e; i++)
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{
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/* SUB-CPU: $0C0000-$0DFFFF is unmapped */
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s68k.memory_map[i].read8 = s68k_read_bus_8;
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s68k.memory_map[i].read16 = s68k_read_bus_16;
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s68k.memory_map[i].write8 = s68k_unused_8_w;
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@ -556,7 +778,7 @@ static void scd_write_byte(unsigned int address, unsigned int data)
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if ((data ^ scd.regs[0x03 >> 1].byte.l) & 0x05)
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{
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int i;
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/* MODE bit */
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if (data & 0x04)
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{
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@ -678,7 +900,7 @@ static void scd_write_byte(unsigned int address, unsigned int data)
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return;
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}
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}
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/* RET bit set in 2M mode */
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if (data & 0x01)
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{
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@ -937,7 +1159,7 @@ static void scd_write_word(unsigned int address, unsigned int data)
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/* RET bit set during 1M mode ? */
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data |= ~scd.dmna & 0x01;
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/* check if RET bit is cleared */
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if (!(data & 0x01))
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{
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@ -949,7 +1171,7 @@ static void scd_write_word(unsigned int address, unsigned int data)
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return;
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}
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}
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/* RET bit set in 2M mode */
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if (data & 0x01)
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{
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@ -1026,7 +1248,7 @@ static void scd_write_word(unsigned int address, unsigned int data)
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/* clear pending level 1 interrupt if disabled ("Batman Returns" option menu) */
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scd.pending &= 0xfd | (data & 0x02);
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/* update IRQ level */
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s68k_update_irq((scd.pending & data) >> 1);
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return;
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@ -1067,114 +1289,198 @@ static void scd_write_word(unsigned int address, unsigned int data)
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}
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}
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void scd_init(void)
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{
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int i;
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/****************************************************************/
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/* MAIN-CPU low memory map ($000000-$7FFFFF) */
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/****************************************************************/
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/* 0x00: boot from CD (Mode 2), 0x40: boot from cartridge (Mode 1) */
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uint8 base = scd.cartridge.boot;
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/* 0x00: boot from CD (default) */
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/* 0x40: boot from cartridge (mode 1) when /CART is asserted */
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int base = scd.cartridge.boot;
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/* $400000-$7FFFFF (resp. $000000-$3FFFFF): cartridge area (4MB) */
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/* $400000-$7FFFFF (resp. $000000-$3FFFFF): cartridge port (/CE0 asserted) */
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cd_cart_init();
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/* $000000-$1FFFFF (resp. $400000-$5FFFFF): CD memory area */
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for (i=base; i<base+0x20; i++)
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/* $000000-$1FFFFF (resp. $400000-$5FFFFF): expansion port (/ROM asserted) */
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for (i=base+0x00; i<base+0x20; i++)
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{
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if (i & 2)
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/* only VA1-VA17 are connected to expansion port */
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switch (i & 0x02)
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{
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case 0x00:
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{
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/* $000000-$01FFFF (resp. $400000-$41FFFF): internal ROM (128KB), mirrored every 256KB up to $1FFFFF (resp. $5FFFFF) */
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m68k.memory_map[i].base = scd.bootrom + ((i & 0x01) << 16);
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m68k.memory_map[i].read8 = NULL;
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m68k.memory_map[i].read16 = NULL;
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m68k.memory_map[i].write8 = m68k_unused_8_w;
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m68k.memory_map[i].write16 = m68k_unused_16_w;
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zbank_memory_map[i].read = NULL;
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zbank_memory_map[i].write = zbank_unused_w;
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break;
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}
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case 0x02:
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{
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/* $020000-$03FFFF (resp. $420000-$43FFFF): PRG-RAM (first 128KB bank), mirrored every 256KB up to $1FFFFF (resp. $5FFFFF) */
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m68k.memory_map[i].base = scd.prg_ram + ((i & 0x01) << 16);
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/* automatic mirrored range remapping when switching PRG-RAM banks */
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if (i > (base + 0x03))
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{
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m68k.memory_map[i].read8 = prg_ram_m68k_read_byte;
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m68k.memory_map[i].read16 = prg_ram_m68k_read_word;
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m68k.memory_map[i].write8 = prg_ram_m68k_write_byte;
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m68k.memory_map[i].write16 = prg_ram_m68k_write_word;
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zbank_memory_map[i].read = prg_ram_z80_read_byte;
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zbank_memory_map[i].write = prg_ram_z80_write_byte;
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}
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else
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{
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m68k.memory_map[i].read8 = NULL;
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m68k.memory_map[i].read16 = NULL;
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m68k.memory_map[i].write8 = NULL;
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m68k.memory_map[i].write16 = NULL;
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zbank_memory_map[i].read = NULL;
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zbank_memory_map[i].write = NULL;
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}
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break;
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}
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}
|
||||
}
|
||||
|
||||
/* $200000-$3FFFFF (resp. $600000-$7FFFFF): expansion port (/RAS2 asserted) */
|
||||
for (i=base+0x20; i<base+0x40; i++)
|
||||
{
|
||||
/* $200000-$23FFFF (resp. $600000-$63FFFF): Word-RAM in 2M mode (256KB), mirrored up to $3FFFFF (resp. $7FFFFF) */
|
||||
m68k.memory_map[i].base = scd.word_ram_2M + ((i & 0x03) << 16);
|
||||
|
||||
/* automatic mirrored range remapping when switching Word-RAM */
|
||||
if (i > (base + 0x23))
|
||||
{
|
||||
m68k.memory_map[i].read8 = word_ram_m68k_read_byte;
|
||||
m68k.memory_map[i].read16 = word_ram_m68k_read_word;
|
||||
m68k.memory_map[i].write8 = word_ram_m68k_write_byte;
|
||||
m68k.memory_map[i].write16 = word_ram_m68k_write_word;
|
||||
zbank_memory_map[i].read = word_ram_z80_read_byte;
|
||||
zbank_memory_map[i].write = word_ram_z80_write_byte;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* $020000-$03FFFF (resp. $420000-$43FFFF): PRG-RAM (first 128KB bank, mirrored each 256KB) */
|
||||
m68k.memory_map[i].base = scd.prg_ram + ((i & 1) << 16);
|
||||
m68k.memory_map[i].read8 = NULL;
|
||||
m68k.memory_map[i].read16 = NULL;
|
||||
m68k.memory_map[i].write8 = NULL;
|
||||
m68k.memory_map[i].write16 = NULL;
|
||||
zbank_memory_map[i].read = NULL;
|
||||
zbank_memory_map[i].write = NULL;
|
||||
|
||||
}
|
||||
else
|
||||
{
|
||||
/* $000000-$01FFFF (resp. $400000-$41FFFF): internal ROM (128KB, mirrored each 256KB) */
|
||||
/* NB: Flux expects it to be mapped at $440000-$45FFFF */
|
||||
m68k.memory_map[i].base = scd.bootrom + ((i & 1) << 16);
|
||||
m68k.memory_map[i].read8 = NULL;
|
||||
m68k.memory_map[i].read16 = NULL;
|
||||
m68k.memory_map[i].write8 = m68k_unused_8_w;
|
||||
m68k.memory_map[i].write16 = m68k_unused_16_w;
|
||||
zbank_memory_map[i].read = NULL;
|
||||
zbank_memory_map[i].write = zbank_unused_w;
|
||||
}
|
||||
}
|
||||
|
||||
/* $200000-$3FFFFF (resp. $600000-$7FFFFF): Word-RAM in 2M mode (256KB mirrored) */
|
||||
for (i=base+0x20; i<base+0x40; i++)
|
||||
{
|
||||
m68k.memory_map[i].base = scd.word_ram_2M + ((i & 3) << 16);
|
||||
m68k.memory_map[i].read8 = NULL;
|
||||
m68k.memory_map[i].read16 = NULL;
|
||||
m68k.memory_map[i].write8 = NULL;
|
||||
m68k.memory_map[i].write16 = NULL;
|
||||
zbank_memory_map[i].read = NULL;
|
||||
zbank_memory_map[i].write = NULL;
|
||||
}
|
||||
|
||||
/****************************************************************/
|
||||
/* SUB-CPU memory map ($000000-$FFFFFF) */
|
||||
/****************************************************************/
|
||||
|
||||
/* $000000-$07FFFF: PRG-RAM (512KB) */
|
||||
for (i=0x00; i<0x08; i++)
|
||||
for (i=0x00; i<0x100; i++)
|
||||
{
|
||||
s68k.memory_map[i].base = scd.prg_ram + (i << 16);
|
||||
s68k.memory_map[i].read8 = NULL;
|
||||
s68k.memory_map[i].read16 = NULL;
|
||||
/* only A1-A19 are connected to SUB-CPU */
|
||||
switch (i & 0x0f)
|
||||
{
|
||||
case 0x00:
|
||||
case 0x01:
|
||||
case 0x02:
|
||||
case 0x03:
|
||||
case 0x04:
|
||||
case 0x05:
|
||||
case 0x06:
|
||||
case 0x07:
|
||||
{
|
||||
/* $000000-$07FFFF (mirrored every 1MB): PRG-RAM (512KB) */
|
||||
s68k.memory_map[i].base = scd.prg_ram + ((i & 0x07) << 16);
|
||||
s68k.memory_map[i].read8 = NULL;
|
||||
s68k.memory_map[i].read16 = NULL;
|
||||
|
||||
/* first 128KB is write-protected */
|
||||
s68k.memory_map[i].write8 = (i < 0x02) ? prg_ram_write_byte : NULL;
|
||||
s68k.memory_map[i].write16 = (i < 0x02) ? prg_ram_write_word : NULL;
|
||||
}
|
||||
/* first 128KB can be write-protected */
|
||||
s68k.memory_map[i].write8 = (i & 0x0e) ? NULL : prg_ram_write_byte;
|
||||
s68k.memory_map[i].write16 = (i & 0x0e) ? NULL : prg_ram_write_word;
|
||||
break;
|
||||
}
|
||||
|
||||
/* $080000-$0BFFFF: Word-RAM in 2M mode (256KB)*/
|
||||
for (i=0x08; i<0x0c; i++)
|
||||
{
|
||||
s68k.memory_map[i].base = scd.word_ram_2M + ((i & 3) << 16);
|
||||
s68k.memory_map[i].read8 = NULL;
|
||||
s68k.memory_map[i].read16 = NULL;
|
||||
s68k.memory_map[i].write8 = NULL;
|
||||
s68k.memory_map[i].write16 = NULL;
|
||||
}
|
||||
|
||||
/* $0C0000-$FD0000: Unused area (Word-RAM mirrored ?) */
|
||||
for (i=0x0c; i<0xfd; i++)
|
||||
{
|
||||
s68k.memory_map[i].base = scd.word_ram_2M + ((i & 3) << 16);
|
||||
s68k.memory_map[i].read8 = s68k_read_bus_8;
|
||||
s68k.memory_map[i].read16 = s68k_read_bus_16;
|
||||
s68k.memory_map[i].write8 = s68k_unused_8_w;
|
||||
s68k.memory_map[i].write16 = s68k_unused_16_w;
|
||||
}
|
||||
case 0x08:
|
||||
case 0x09:
|
||||
case 0x0a:
|
||||
case 0x0b:
|
||||
{
|
||||
/* $080000-$0BFFFF (mirrored every 1MB): Word-RAM in 2M mode (256KB)*/
|
||||
s68k.memory_map[i].base = scd.word_ram_2M + ((i & 0x03) << 16);
|
||||
|
||||
/* $FD0000-$FF0000 (odd address only): 8KB backup RAM, mirrored(Wonder Mega / X'Eye BIOS access it at $FD0000-$FD1FFF) */
|
||||
for (i=0xfd; i<0xff; i++)
|
||||
{
|
||||
s68k.memory_map[i].base = NULL;
|
||||
s68k.memory_map[i].read8 = bram_read_byte;
|
||||
s68k.memory_map[i].read16 = bram_read_word;
|
||||
s68k.memory_map[i].write8 = bram_write_byte;
|
||||
s68k.memory_map[i].write16 = bram_write_word;
|
||||
}
|
||||
/* automatic mirrored range remapping when switching Word-RAM */
|
||||
if (i > 0x0f)
|
||||
{
|
||||
s68k.memory_map[i].read8 = word_ram_s68k_read_byte;
|
||||
s68k.memory_map[i].read16 = word_ram_s68k_read_word;
|
||||
s68k.memory_map[i].write8 = word_ram_s68k_write_byte;
|
||||
s68k.memory_map[i].write16 = word_ram_s68k_write_word;
|
||||
}
|
||||
else
|
||||
{
|
||||
s68k.memory_map[i].read8 = NULL;
|
||||
s68k.memory_map[i].read16 = NULL;
|
||||
s68k.memory_map[i].write8 = NULL;
|
||||
s68k.memory_map[i].write16 = NULL;
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
/* $FF0000-$FFFFFF: PCM hardware & SUB-CPU registers */
|
||||
s68k.memory_map[0xff].base = NULL;
|
||||
s68k.memory_map[0xff].read8 = scd_read_byte;
|
||||
s68k.memory_map[0xff].read16 = scd_read_word;
|
||||
s68k.memory_map[0xff].write8 = scd_write_byte;
|
||||
s68k.memory_map[0xff].write16 = scd_write_word;
|
||||
case 0x0c:
|
||||
case 0x0d:
|
||||
{
|
||||
/* $0C0000-$0DFFFF (mirrored every 1MB): unused in 2M mode (?) */
|
||||
s68k.memory_map[i].base = scd.word_ram_2M + ((i & 0x03) << 16);
|
||||
|
||||
/* automatic mirrored range remapping when switching Word-RAM */
|
||||
if (i > 0x0f)
|
||||
{
|
||||
s68k.memory_map[i].read8 = word_ram_s68k_read_byte;
|
||||
s68k.memory_map[i].read16 = word_ram_s68k_read_word;
|
||||
s68k.memory_map[i].write8 = word_ram_s68k_write_byte;
|
||||
s68k.memory_map[i].write16 = word_ram_s68k_write_word;
|
||||
}
|
||||
else
|
||||
{
|
||||
s68k.memory_map[i].read8 = s68k_read_bus_8;
|
||||
s68k.memory_map[i].read16 = s68k_read_bus_16;
|
||||
s68k.memory_map[i].write8 = s68k_unused_8_w;
|
||||
s68k.memory_map[i].write16 = s68k_unused_16_w;
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
case 0x0e:
|
||||
{
|
||||
/* $FE0000-$FEFFFF (mirrored every 1MB): 8KB backup RAM (Wonder Mega / X'Eye BIOS access it at $FD0000-$FD1FFF ?) */
|
||||
s68k.memory_map[i].base = NULL;
|
||||
s68k.memory_map[i].read8 = bram_read_byte;
|
||||
s68k.memory_map[i].read16 = bram_read_word;
|
||||
s68k.memory_map[i].write8 = bram_write_byte;
|
||||
s68k.memory_map[i].write16 = bram_write_word;
|
||||
break;
|
||||
}
|
||||
|
||||
case 0x0f:
|
||||
{
|
||||
/* $FF0000-$FFFFFF (mirrored every 1MB): PCM hardware & SUB-CPU registers */
|
||||
s68k.memory_map[i].base = NULL;
|
||||
s68k.memory_map[i].read8 = scd_read_byte;
|
||||
s68k.memory_map[i].read16 = scd_read_word;
|
||||
s68k.memory_map[i].write8 = scd_write_byte;
|
||||
s68k.memory_map[i].write16 = scd_write_word;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Initialize CD hardware */
|
||||
cdc_init();
|
||||
@ -1192,8 +1498,6 @@ void scd_reset(int hard)
|
||||
/* TODO: figure what exactly is resetted when RESET bit is cleared by SUB-CPU */
|
||||
if (hard)
|
||||
{
|
||||
int i;
|
||||
|
||||
/* Clear all ASIC registers by default */
|
||||
memset(scd.regs, 0, sizeof(scd.regs));
|
||||
|
||||
@ -1211,13 +1515,9 @@ void scd_reset(int hard)
|
||||
/* 2M mode */
|
||||
word_ram_switch(0);
|
||||
|
||||
/* reset PRG-RAM banking on MAIN-CPU side */
|
||||
for (i=scd.cartridge.boot+0x02; i<scd.cartridge.boot+0x20; i+=4)
|
||||
{
|
||||
/* MAIN-CPU: $020000-$03FFFF (resp. $420000-$43FFFF) mapped to first 128KB PRG-RAM bank (mirrored each 256KB) */
|
||||
m68k.memory_map[i].base = scd.prg_ram;
|
||||
m68k.memory_map[i+1].base = scd.prg_ram + 0x10000;
|
||||
}
|
||||
/* reset PRG-RAM bank on MAIN-CPU side */
|
||||
m68k.memory_map[scd.cartridge.boot + 0x02].base = scd.prg_ram;
|
||||
m68k.memory_map[scd.cartridge.boot + 0x03].base = scd.prg_ram + 0x10000;
|
||||
|
||||
/* reset & halt SUB-CPU */
|
||||
s68k.cycles = 0;
|
||||
@ -1475,34 +1775,28 @@ int scd_context_load(uint8 *state)
|
||||
/* PRG-RAM */
|
||||
load_param(scd.prg_ram, sizeof(scd.prg_ram));
|
||||
|
||||
/* PRG-RAM can only be accessed from MAIN 68K & Z80 when SUB-CPU is halted (Dungeon Explorer USA version) */
|
||||
/* PRG-RAM 128K bank mapped on MAIN-CPU side */
|
||||
m68k.memory_map[scd.cartridge.boot + 0x02].base = scd.prg_ram + ((scd.regs[0x03>>1].byte.l & 0xc0) << 11);
|
||||
m68k.memory_map[scd.cartridge.boot + 0x03].base = m68k.memory_map[scd.cartridge.boot + 0x02].base + 0x10000;
|
||||
|
||||
/* PRG-RAM can only be accessed from MAIN 68K & Z80 if SUB-CPU is halted (Dungeon Explorer USA version) */
|
||||
if ((scd.regs[0x00].byte.l & 0x03) != 0x01)
|
||||
{
|
||||
/* $020000-$03FFFF (resp. $420000-$43FFFF) is mapped to PRG-RAM 128K bank (mirrored every 256 KB) */
|
||||
for (i=scd.cartridge.boot+0x02; i<scd.cartridge.boot+0x20; i+=4)
|
||||
{
|
||||
m68k.memory_map[i].base = m68k.memory_map[i+1].base = scd.prg_ram + ((scd.regs[0x03>>1].byte.l & 0xc0) << 11);
|
||||
m68k.memory_map[i].read8 = m68k.memory_map[i+1].read8 = NULL;
|
||||
m68k.memory_map[i].read16 = m68k.memory_map[i+1].read16 = NULL;
|
||||
m68k.memory_map[i].write8 = m68k.memory_map[i+1].write8 = NULL;
|
||||
m68k.memory_map[i].write16 = m68k.memory_map[i+1].write16 = NULL;
|
||||
zbank_memory_map[i].read = zbank_memory_map[i+1].read = NULL;
|
||||
zbank_memory_map[i].write = zbank_memory_map[i+1].write = NULL;
|
||||
}
|
||||
m68k.memory_map[scd.cartridge.boot + 0x02].read8 = m68k.memory_map[scd.cartridge.boot + 0x03].read8 = NULL;
|
||||
m68k.memory_map[scd.cartridge.boot + 0x02].read16 = m68k.memory_map[scd.cartridge.boot + 0x03].read16 = NULL;
|
||||
m68k.memory_map[scd.cartridge.boot + 0x02].write8 = m68k.memory_map[scd.cartridge.boot + 0x03].write8 = NULL;
|
||||
m68k.memory_map[scd.cartridge.boot + 0x02].write16 = m68k.memory_map[scd.cartridge.boot + 0x03].write16 = NULL;
|
||||
zbank_memory_map[scd.cartridge.boot + 0x02].read = zbank_memory_map[scd.cartridge.boot + 0x03].read = NULL;
|
||||
zbank_memory_map[scd.cartridge.boot + 0x02].write = zbank_memory_map[scd.cartridge.boot + 0x03].write = NULL;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* $020000-$03FFFF (resp. $420000-$43FFFF) is not mapped (mirrored every 256 KB) */
|
||||
for (i=scd.cartridge.boot+0x02; i<scd.cartridge.boot+0x20; i+=4)
|
||||
{
|
||||
m68k.memory_map[i].base = m68k.memory_map[i+1].base = scd.prg_ram + ((scd.regs[0x03>>1].byte.l & 0xc0) << 11);
|
||||
m68k.memory_map[i].read8 = m68k.memory_map[i+1].read8 = m68k_read_bus_8;
|
||||
m68k.memory_map[i].read16 = m68k.memory_map[i+1].read16 = m68k_read_bus_16;
|
||||
m68k.memory_map[i].write8 = m68k.memory_map[i+1].write8 = m68k_unused_8_w;
|
||||
m68k.memory_map[i].write16 = m68k.memory_map[i+1].write16 = m68k_unused_16_w;
|
||||
zbank_memory_map[i].read = zbank_memory_map[i+1].read = zbank_unused_r;
|
||||
zbank_memory_map[i].write = zbank_memory_map[i+1].write = zbank_unused_w;
|
||||
}
|
||||
m68k.memory_map[scd.cartridge.boot + 0x02].read8 = m68k.memory_map[scd.cartridge.boot + 0x03].read8 = m68k_read_bus_8;
|
||||
m68k.memory_map[scd.cartridge.boot + 0x02].read16 = m68k.memory_map[scd.cartridge.boot + 0x03].read16 = m68k_read_bus_16;
|
||||
m68k.memory_map[scd.cartridge.boot + 0x02].write8 = m68k.memory_map[scd.cartridge.boot + 0x03].write8 = m68k_unused_8_w;
|
||||
m68k.memory_map[scd.cartridge.boot + 0x02].write16 = m68k.memory_map[scd.cartridge.boot + 0x03].write16 = m68k_unused_16_w;
|
||||
zbank_memory_map[scd.cartridge.boot + 0x02].read = zbank_memory_map[scd.cartridge.boot + 0x03].read = zbank_unused_r;
|
||||
zbank_memory_map[scd.cartridge.boot + 0x02].write = zbank_memory_map[scd.cartridge.boot + 0x03].write = zbank_unused_w;
|
||||
}
|
||||
|
||||
/* Word-RAM */
|
||||
@ -1510,7 +1804,7 @@ int scd_context_load(uint8 *state)
|
||||
{
|
||||
/* 1M Mode */
|
||||
load_param(scd.word_ram, sizeof(scd.word_ram));
|
||||
|
||||
|
||||
if (scd.regs[0x03>>1].byte.l & 0x01)
|
||||
{
|
||||
/* Word-RAM 1 assigned to MAIN-CPU */
|
||||
@ -1597,10 +1891,15 @@ int scd_context_load(uint8 *state)
|
||||
/* 2M mode */
|
||||
load_param(scd.word_ram_2M, sizeof(scd.word_ram_2M));
|
||||
|
||||
for (i=scd.cartridge.boot+0x20; i<scd.cartridge.boot+0x24; i++)
|
||||
/* MAIN-CPU: $200000-$21FFFF is mapped to 256K Word-RAM (upper 128K) */
|
||||
for (i=scd.cartridge.boot+0x20; i<scd.cartridge.boot+0x22; i++)
|
||||
{
|
||||
m68k.memory_map[i].base = scd.word_ram_2M + ((i & 0x03) << 16);
|
||||
}
|
||||
|
||||
/* MAIN-CPU: $220000-$23FFFF is mapped to 256K Word-RAM (lower 128K) */
|
||||
for (i=scd.cartridge.boot+0x22; i<scd.cartridge.boot+0x24; i++)
|
||||
{
|
||||
/* MAIN-CPU: $200000-$23FFFF is mapped to 256K Word-RAM */
|
||||
m68k.memory_map[i].base = scd.word_ram_2M + ((i & 0x03) << 16);
|
||||
m68k.memory_map[i].read8 = NULL;
|
||||
m68k.memory_map[i].read16 = NULL;
|
||||
m68k.memory_map[i].write8 = NULL;
|
||||
@ -1609,18 +1908,18 @@ int scd_context_load(uint8 *state)
|
||||
zbank_memory_map[i].write = NULL;
|
||||
}
|
||||
|
||||
/* SUB-CPU: $080000-$0BFFFF is mapped to 256K Word-RAM */
|
||||
for (i=0x08; i<0x0c; i++)
|
||||
{
|
||||
/* SUB-CPU: $080000-$0BFFFF is mapped to 256K Word-RAM */
|
||||
s68k.memory_map[i].read8 = NULL;
|
||||
s68k.memory_map[i].read16 = NULL;
|
||||
s68k.memory_map[i].write8 = NULL;
|
||||
s68k.memory_map[i].write16 = NULL;
|
||||
}
|
||||
|
||||
/* SUB-CPU: $0C0000-$0DFFFF is unmapped */
|
||||
for (i=0x0c; i<0x0e; i++)
|
||||
{
|
||||
/* SUB-CPU: $0C0000-$0DFFFF is unmapped */
|
||||
s68k.memory_map[i].read8 = s68k_read_bus_8;
|
||||
s68k.memory_map[i].read16 = s68k_read_bus_16;
|
||||
s68k.memory_map[i].write8 = s68k_unused_8_w;
|
||||
|
||||
@ -195,7 +195,7 @@ void z80_write_byte(unsigned int address, unsigned int data)
|
||||
m68k_lockup_w_8(address, data);
|
||||
return;
|
||||
}
|
||||
|
||||
|
||||
default:
|
||||
{
|
||||
m68k_unused_8_w(address, data);
|
||||
@ -220,7 +220,7 @@ void z80_write_word(unsigned int address, unsigned int data)
|
||||
|
||||
|
||||
/*--------------------------------------------------------------------------*/
|
||||
/* I/O Control */
|
||||
/* MAIN-CPU polling detection and SUB-CPU synchronization (MEGA CD mode) */
|
||||
/*--------------------------------------------------------------------------*/
|
||||
|
||||
static void m68k_poll_detect(unsigned int reg_mask)
|
||||
@ -292,6 +292,10 @@ static void m68k_poll_sync(unsigned int reg_mask)
|
||||
m68k.poll.detected &= ~reg_mask;
|
||||
}
|
||||
|
||||
/*--------------------------------------------------------------------------*/
|
||||
/* I/O Control */
|
||||
/*--------------------------------------------------------------------------*/
|
||||
|
||||
unsigned int ctrl_io_read_byte(unsigned int address)
|
||||
{
|
||||
switch ((address >> 8) & 0xFF)
|
||||
@ -372,7 +376,7 @@ unsigned int ctrl_io_read_byte(unsigned int address)
|
||||
{
|
||||
return scd.regs[index >> 1].byte.l;
|
||||
}
|
||||
|
||||
|
||||
/* register MSB */
|
||||
return scd.regs[index >> 1].byte.h;
|
||||
}
|
||||
@ -679,34 +683,27 @@ void ctrl_io_write_byte(unsigned int address, unsigned int data)
|
||||
/* check if SUB-CPU halt status has changed */
|
||||
if (s68k.stopped != halted)
|
||||
{
|
||||
int i;
|
||||
/* PRG-RAM (128KB bank) is normally mapped to $020000-$03FFFF (resp. $420000-$43FFFF) */
|
||||
unsigned int base = scd.cartridge.boot + 0x02;
|
||||
|
||||
/* PRG-RAM can only be accessed from MAIN 68K & Z80 when SUB-CPU is halted (Dungeon Explorer USA version) */
|
||||
if ((data & 0x03) != 0x01)
|
||||
{
|
||||
/* $020000-$03FFFF (resp. $420000-$43FFFF) is mapped to PRG-RAM 128K bank (mirrored every 256 KB) */
|
||||
for (i=scd.cartridge.boot+0x02; i<scd.cartridge.boot+0x20; i+=4)
|
||||
{
|
||||
m68k.memory_map[i].read8 = m68k.memory_map[i+1].read8 = NULL;
|
||||
m68k.memory_map[i].read16 = m68k.memory_map[i+1].read16 = NULL;
|
||||
m68k.memory_map[i].write8 = m68k.memory_map[i+1].write8 = NULL;
|
||||
m68k.memory_map[i].write16 = m68k.memory_map[i+1].write16 = NULL;
|
||||
zbank_memory_map[i].read = zbank_memory_map[i+1].read = NULL;
|
||||
zbank_memory_map[i].write = zbank_memory_map[i+1].write = NULL;
|
||||
}
|
||||
m68k.memory_map[base].read8 = m68k.memory_map[base+1].read8 = NULL;
|
||||
m68k.memory_map[base].read16 = m68k.memory_map[base+1].read16 = NULL;
|
||||
m68k.memory_map[base].write8 = m68k.memory_map[base+1].write8 = NULL;
|
||||
m68k.memory_map[base].write16 = m68k.memory_map[base+1].write16 = NULL;
|
||||
zbank_memory_map[base].read = zbank_memory_map[base+1].read = NULL;
|
||||
zbank_memory_map[base].write = zbank_memory_map[base+1].write = NULL;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* $020000-$03FFFF (resp. $420000-$43FFFF) is not mapped (mirrored every 256 KB) */
|
||||
for (i=scd.cartridge.boot+0x02; i<scd.cartridge.boot+0x20; i+=4)
|
||||
{
|
||||
m68k.memory_map[i].read8 = m68k.memory_map[i+1].read8 = m68k_read_bus_8;
|
||||
m68k.memory_map[i].read16 = m68k.memory_map[i+1].read16 = m68k_read_bus_16;
|
||||
m68k.memory_map[i].write8 = m68k.memory_map[i+1].write8 = m68k_unused_8_w;
|
||||
m68k.memory_map[i].write16 = m68k.memory_map[i+1].write16 = m68k_unused_16_w;
|
||||
zbank_memory_map[i].read = zbank_memory_map[i+1].read = zbank_unused_r;
|
||||
zbank_memory_map[i].write = zbank_memory_map[i+1].write = zbank_unused_w;
|
||||
}
|
||||
m68k.memory_map[base].read8 = m68k.memory_map[base+1].read8 = m68k_read_bus_8;
|
||||
m68k.memory_map[base].read16 = m68k.memory_map[base+1].read16 = m68k_read_bus_16;
|
||||
m68k.memory_map[base].write8 = m68k.memory_map[base+1].write8 = m68k_unused_8_w;
|
||||
m68k.memory_map[base].write16 = m68k.memory_map[base+1].write16 = m68k_unused_16_w;
|
||||
zbank_memory_map[base].read = zbank_memory_map[base+1].read = zbank_unused_r;
|
||||
zbank_memory_map[base].write = zbank_memory_map[base+1].write = zbank_unused_w;
|
||||
}
|
||||
}
|
||||
|
||||
@ -760,7 +757,7 @@ void ctrl_io_write_byte(unsigned int address, unsigned int data)
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/* update BK0-1 bits */
|
||||
scd.regs[0x03>>1].byte.l = (scd.regs[0x02>>1].byte.l & ~0xc0) | (data & 0xc0);
|
||||
return;
|
||||
@ -911,34 +908,27 @@ void ctrl_io_write_word(unsigned int address, unsigned int data)
|
||||
/* check if SUB-CPU halt status has changed */
|
||||
if (s68k.stopped != halted)
|
||||
{
|
||||
int i;
|
||||
/* PRG-RAM (128KB bank) is normally mapped to $020000-$03FFFF (resp. $420000-$43FFFF) */
|
||||
unsigned int base = scd.cartridge.boot + 0x02;
|
||||
|
||||
/* PRG-RAM can only be accessed from MAIN 68K & Z80 when SUB-CPU is halted (Dungeon Explorer USA version) */
|
||||
if ((data & 0x03) != 0x01)
|
||||
{
|
||||
/* $020000-$03FFFF (resp. $420000-$43FFFF) is mapped to PRG-RAM 128K bank (mirrored every 256 KB) */
|
||||
for (i=scd.cartridge.boot+0x02; i<scd.cartridge.boot+0x20; i+=4)
|
||||
{
|
||||
m68k.memory_map[i].read8 = m68k.memory_map[i+1].read8 = NULL;
|
||||
m68k.memory_map[i].read16 = m68k.memory_map[i+1].read16 = NULL;
|
||||
m68k.memory_map[i].write8 = m68k.memory_map[i+1].write8 = NULL;
|
||||
m68k.memory_map[i].write16 = m68k.memory_map[i+1].write16 = NULL;
|
||||
zbank_memory_map[i].read = zbank_memory_map[i+1].read = NULL;
|
||||
zbank_memory_map[i].write = zbank_memory_map[i+1].write = NULL;
|
||||
}
|
||||
m68k.memory_map[base].read8 = m68k.memory_map[base+1].read8 = NULL;
|
||||
m68k.memory_map[base].read16 = m68k.memory_map[base+1].read16 = NULL;
|
||||
m68k.memory_map[base].write8 = m68k.memory_map[base+1].write8 = NULL;
|
||||
m68k.memory_map[base].write16 = m68k.memory_map[base+1].write16 = NULL;
|
||||
zbank_memory_map[base].read = zbank_memory_map[base+1].read = NULL;
|
||||
zbank_memory_map[base].write = zbank_memory_map[base+1].write = NULL;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* $020000-$03FFFF (resp. $420000-$43FFFF) is not mapped (mirrored every 256 KB) */
|
||||
for (i=scd.cartridge.boot+0x02; i<scd.cartridge.boot+0x20; i+=4)
|
||||
{
|
||||
m68k.memory_map[i].read8 = m68k.memory_map[i+1].read8 = m68k_read_bus_8;
|
||||
m68k.memory_map[i].read16 = m68k.memory_map[i+1].read16 = m68k_read_bus_16;
|
||||
m68k.memory_map[i].write8 = m68k.memory_map[i+1].write8 = m68k_unused_8_w;
|
||||
m68k.memory_map[i].write16 = m68k.memory_map[i+1].write16 = m68k_unused_16_w;
|
||||
zbank_memory_map[i].read = zbank_memory_map[i+1].read = zbank_unused_r;
|
||||
zbank_memory_map[i].write = zbank_memory_map[i+1].write = zbank_unused_w;
|
||||
}
|
||||
m68k.memory_map[base].read8 = m68k.memory_map[base+1].read8 = m68k_read_bus_8;
|
||||
m68k.memory_map[base].read16 = m68k.memory_map[base+1].read16 = m68k_read_bus_16;
|
||||
m68k.memory_map[base].write8 = m68k.memory_map[base+1].write8 = m68k_unused_8_w;
|
||||
m68k.memory_map[base].write16 = m68k.memory_map[base+1].write16 = m68k_unused_16_w;
|
||||
zbank_memory_map[base].read = zbank_memory_map[base+1].read = zbank_unused_r;
|
||||
zbank_memory_map[base].write = zbank_memory_map[base+1].write = zbank_unused_w;
|
||||
}
|
||||
}
|
||||
|
||||
@ -1004,7 +994,7 @@ void ctrl_io_write_word(unsigned int address, unsigned int data)
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/* update WP0-7 & BK0-1 bits */
|
||||
scd.regs[0x02>>1].w = (scd.regs[0x02>>1].w & ~0xffc0) | (data & 0xffc0);
|
||||
return;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user