/* gameplaySP * * Copyright (C) 2006 Exophase * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "common.h" /* Sound */ #define gbc_sound_tone_control_low(channel, regn) \ { \ u32 initial_volume = (value >> 12) & 0x0F; \ u32 envelope_ticks = ((value >> 8) & 0x07) * 4; \ gbc_sound_channel[channel].length_ticks = 64 - (value & 0x3F); \ gbc_sound_channel[channel].sample_table_idx = ((value >> 6) & 0x03); \ gbc_sound_channel[channel].envelope_direction = (value >> 11) & 0x01; \ gbc_sound_channel[channel].envelope_initial_volume = initial_volume; \ gbc_sound_channel[channel].envelope_volume = initial_volume; \ gbc_sound_channel[channel].envelope_initial_ticks = envelope_ticks; \ gbc_sound_channel[channel].envelope_ticks = envelope_ticks; \ gbc_sound_channel[channel].envelope_status = (envelope_ticks != 0); \ gbc_sound_channel[channel].envelope_volume = initial_volume; \ gbc_sound_update = 1; \ write_ioreg(regn, value); \ } \ #define gbc_sound_tone_control_high(channel, regn) \ { \ u32 rate = value & 0x7FF; \ gbc_sound_channel[channel].rate = rate; \ gbc_sound_channel[channel].frequency_step = \ float_to_fp16_16(((131072.0 / (2048 - rate)) * 8.0) / sound_frequency); \ gbc_sound_channel[channel].length_status = (value >> 14) & 0x01; \ if(value & 0x8000) \ { \ gbc_sound_channel[channel].active_flag = 1; \ gbc_sound_channel[channel].sample_index -= float_to_fp16_16(1.0 / 12.0); \ gbc_sound_channel[channel].envelope_ticks = \ gbc_sound_channel[channel].envelope_initial_ticks; \ gbc_sound_channel[channel].envelope_volume = \ gbc_sound_channel[channel].envelope_initial_volume; \ } \ \ gbc_sound_update = 1; \ write_ioreg(regn, value); \ } \ #define gbc_sound_tone_control_sweep() \ { \ u32 sweep_ticks = ((value >> 4) & 0x07) * 2; \ gbc_sound_channel[0].sweep_shift = value & 0x07; \ gbc_sound_channel[0].sweep_direction = (value >> 3) & 0x01; \ gbc_sound_channel[0].sweep_status = (value != 8); \ gbc_sound_channel[0].sweep_ticks = sweep_ticks; \ gbc_sound_channel[0].sweep_initial_ticks = sweep_ticks; \ gbc_sound_update = 1; \ write_ioreg(REG_SOUND1CNT_L, value); \ } \ #define gbc_sound_wave_control() \ { \ gbc_sound_channel[2].wave_type = (value >> 5) & 0x01; \ gbc_sound_channel[2].wave_bank = (value >> 6) & 0x01; \ gbc_sound_channel[2].master_enable = 0; \ if(value & 0x80) \ gbc_sound_channel[2].master_enable = 1; \ \ gbc_sound_update = 1; \ write_ioreg(REG_SOUND3CNT_L, value); \ } \ static const u32 gbc_sound_wave_volume[4] = { 0, 16384, 8192, 4096 }; #define gbc_sound_tone_control_low_wave() \ { \ gbc_sound_channel[2].length_ticks = 256 - (value & 0xFF); \ if((value >> 15) & 0x01) \ gbc_sound_channel[2].wave_volume = 12288; \ else \ gbc_sound_channel[2].wave_volume = \ gbc_sound_wave_volume[(value >> 13) & 0x03]; \ gbc_sound_update = 1; \ write_ioreg(REG_SOUND3CNT_H, value); \ } \ #define gbc_sound_tone_control_high_wave() \ { \ u32 rate = value & 0x7FF; \ gbc_sound_channel[2].rate = rate; \ gbc_sound_channel[2].frequency_step = \ float_to_fp16_16((2097152.0 / (2048 - rate)) / sound_frequency); \ gbc_sound_channel[2].length_status = (value >> 14) & 0x01; \ if(value & 0x8000) \ { \ gbc_sound_channel[2].sample_index = 0; \ gbc_sound_channel[2].active_flag = 1; \ } \ gbc_sound_update = 1; \ write_ioreg(REG_SOUND3CNT_X, value); \ } \ #define gbc_sound_noise_control() \ { \ u32 dividing_ratio = value & 0x07; \ u32 frequency_shift = (value >> 4) & 0x0F; \ if(dividing_ratio == 0) \ { \ gbc_sound_channel[3].frequency_step = \ float_to_fp16_16(1048576.0 / (1 << (frequency_shift + 1)) / \ sound_frequency); \ } \ else \ { \ gbc_sound_channel[3].frequency_step = \ float_to_fp16_16(524288.0 / (dividing_ratio * \ (1 << (frequency_shift + 1))) / sound_frequency); \ } \ gbc_sound_channel[3].noise_type = (value >> 3) & 0x01; \ gbc_sound_channel[3].length_status = (value >> 14) & 0x01; \ if(value & 0x8000) \ { \ gbc_sound_channel[3].sample_index = 0; \ gbc_sound_channel[3].active_flag = 1; \ gbc_sound_channel[3].envelope_ticks = \ gbc_sound_channel[3].envelope_initial_ticks; \ gbc_sound_channel[3].envelope_volume = \ gbc_sound_channel[3].envelope_initial_volume; \ } \ gbc_sound_update = 1; \ write_ioreg(REG_SOUND4CNT_H, value); \ } \ static void gbc_trigger_sound(u32 value) { u32 channel; /* Trigger all 4 GBC sound channels */ for (channel = 0; channel < 4; channel++) { gbc_sound_master_volume_right = value & 0x07; gbc_sound_master_volume_left = (value >> 4) & 0x07; gbc_sound_channel[channel].status = (gbc_sound_status_type) (((value >> (channel + 8)) & 0x1) | ((value >> (channel + 11)) & 0x3)); } write_ioreg(REG_SOUNDCNT_L, value); } #define trigger_sound() \ { \ timer[0].direct_sound_channels = (timer_ds_channel_type) \ ((((value >> 10) & 0x01) == 0) | ((((value >> 14) & 0x01) == 0) << 1)); \ timer[1].direct_sound_channels = (timer_ds_channel_type) \ ((((value >> 10) & 0x01) == 1) | ((((value >> 14) & 0x01) == 1) << 1)); \ direct_sound_channel[0].volume = (direct_sound_volume_type) \ ((value >> 2) & 0x01); \ direct_sound_channel[0].status = (direct_sound_status_type) \ ((value >> 8) & 0x03); \ direct_sound_channel[1].volume = (direct_sound_volume_type) \ ((value >> 3) & 0x01); \ direct_sound_channel[1].status = (direct_sound_status_type) \ ((value >> 12) & 0x03); \ gbc_sound_master_volume = value & 0x03; \ \ if((value >> 11) & 0x01) \ sound_reset_fifo(0); \ if((value >> 15) & 0x01) \ sound_reset_fifo(1); \ write_ioreg(REG_SOUNDCNT_H, value); \ } \ static void sound_control_x(u32 value) { if (value & 0x80) { if (sound_on != 1) sound_on = 1; } else { u32 i; for (i = 0; i < 4; i++) gbc_sound_channel[i].active_flag = 0; sound_on = 0; } value = (value & 0xFFF0) | (read_ioreg(REG_SOUNDCNT_X) & 0x000F); write_ioreg(REG_SOUNDCNT_X, value); } #define sound_update_frequency_step(timer_number) \ timer[timer_number].frequency_step = \ float_to_fp8_24((GBC_BASE_RATE / sound_frequency) / (timer_reload)) \ /* Main */ extern timer_type timer[4]; static const u32 prescale_table[] = { 0, 6, 8, 10 }; #define count_timer(timer_number) \ timer[timer_number].reload = 0x10000 - value; \ if(timer_number < 2) \ { \ u32 timer_reload = \ timer[timer_number].reload << timer[timer_number].prescale; \ sound_update_frequency_step(timer_number); \ } \ #define adjust_sound_buffer(timer_number, channel) \ if(timer[timer_number].direct_sound_channels & (0x01 << channel)) \ { \ direct_sound_channel[channel].buffer_index = \ (gbc_sound_buffer_index + buffer_adjust) % BUFFER_SIZE; \ } \ static void trigger_timer(u32 timer_number, u32 value) { if (value & 0x80) { if(timer[timer_number].status == TIMER_INACTIVE) { u32 prescale = prescale_table[value & 0x03]; u32 timer_reload = timer[timer_number].reload; if((value >> 2) & 0x01) timer[timer_number].status = TIMER_CASCADE; else timer[timer_number].status = TIMER_PRESCALE; timer[timer_number].prescale = prescale; timer[timer_number].irq = (timer_irq_type)((value >> 6) & 0x1); write_ioreg(REG_TM0D + (timer_number * 2), (u32)(-timer_reload)); timer_reload <<= prescale; timer[timer_number].count = timer_reload; if(timer_reload < execute_cycles) execute_cycles = timer_reload; if(timer_number < 2) { u32 buffer_adjust = (u32)(((float)(cpu_ticks - gbc_sound_last_cpu_ticks) * sound_frequency) / GBC_BASE_RATE) * 2; sound_update_frequency_step(timer_number); adjust_sound_buffer(timer_number, 0); adjust_sound_buffer(timer_number, 1); } } } else { if(timer[timer_number].status != TIMER_INACTIVE) { timer[timer_number].status = TIMER_INACTIVE; } } write_ioreg(REG_TM0CNT + (timer_number * 2), value); } // This table is configured for sequential access on system defaults const u32 waitstate_cycles_sequential[16][3] = { { 1, 1, 1 }, // BIOS { 1, 1, 1 }, // Invalid { 3, 3, 6 }, // EWRAM (default settings) { 1, 1, 1 }, // IWRAM { 1, 1, 1 }, // IO Registers { 1, 1, 2 }, // Palette RAM { 1, 1, 2 }, // VRAM { 1, 1, 2 }, // OAM { 3, 3, 6 }, // Gamepak (wait 0) { 3, 3, 6 }, // Gamepak (wait 0) { 5, 5, 9 }, // Gamepak (wait 1) { 5, 5, 9 }, // Gamepak (wait 1) { 9, 9, 17 }, // Gamepak (wait 2) { 9, 9, 17 }, // Gamepak (wait 2) }; // Different settings for gamepak ws0-2 sequential (2nd) access const u32 gamepak_waitstate_sequential[2][3][3] = { { { 3, 3, 6 }, { 5, 5, 9 }, { 9, 9, 17 } }, { { 2, 2, 3 }, { 2, 2, 3 }, { 2, 2, 3 } } }; u8 bios_rom[1024 * 16]; u32 bios_read_protect; // Up to 128kb, store SRAM, flash ROM, or EEPROM here. u8 gamepak_backup[1024 * 128]; dma_transfer_type dma[4]; // ROM memory is allocated in blocks of 1MB to better map the native block // mapping system. We will try to allocate 32 of them to allow loading // ROMs up to 32MB, but we might fail on memory constrained systems. u8 *gamepak_buffers[32]; /* Pointers to malloc'ed blocks */ u32 gamepak_buffer_count; /* Value between 1 and 32 */ u32 gamepak_size; /* Size of the ROM in bytes */ // LRU queue with the loaded blocks and what they map to struct { u16 next_lru; /* Index in the struct to the next LRU entry */ s16 phy_rom; /* ROM page number (-1 means not mapped) */ } gamepak_blk_queue[1024]; u16 gamepak_lru_head; u16 gamepak_lru_tail; // Stick page bit: prevents page eviction for a frame. This is used to prevent // unmapping code pages while being used (ie. in the interpreter). u32 gamepak_sticky_bit[1024/32]; #define gamepak_sb_test(idx) \ (gamepak_sticky_bit[((unsigned)(idx)) >> 5] & (1 << (((unsigned)(idx)) & 31))) // This is global so that it can be kept open for large ROMs to swap // pages from, so there's no slowdown with opening and closing the file // a lot. FILE *gamepak_file_large = NULL; // Writes to these respective locations should trigger an update // so the related subsystem may react to it. // If GBC audio is written to: u32 gbc_sound_update = 0; // If the GBC audio waveform is modified: u32 gbc_sound_wave_update = 0; // Keep it 32KB until the upper 64KB is accessed, then make it 64KB. backup_type_type backup_type = BACKUP_NONE; sram_size_type sram_size = SRAM_SIZE_32KB; flash_mode_type flash_mode = FLASH_BASE_MODE; u32 flash_command_position = 0; u32 flash_bank_num; // 0 or 1 flash_device_id_type flash_device_id = FLASH_DEVICE_MACRONIX_64KB; flash_manufacturer_id_type flash_manufacturer_id = FLASH_MANUFACTURER_MACRONIX; flash_size_type flash_size = FLASH_SIZE_64KB; u8 read_backup(u32 address) { u8 value = 0; if(backup_type == BACKUP_NONE) backup_type = BACKUP_SRAM; if(backup_type == BACKUP_SRAM) value = gamepak_backup[address]; else if(flash_mode == FLASH_ID_MODE) { if (flash_size == FLASH_SIZE_128KB) { /* ID manufacturer type */ if(address == 0x0000) value = FLASH_MANUFACTURER_MACRONIX; /* ID device type */ else if(address == 0x0001) value = FLASH_DEVICE_MACRONIX_128KB; } else { /* ID manufacturer type */ if(address == 0x0000) value = FLASH_MANUFACTURER_PANASONIC; /* ID device type */ else if(address == 0x0001) value = FLASH_DEVICE_PANASONIC_64KB; } } else { u32 fulladdr = address + 64*1024*flash_bank_num; value = gamepak_backup[fulladdr]; } return value; } #define read_backup8() \ value = read_backup(address & 0xFFFF) \ #define read_backup16() \ value = 0 \ #define read_backup32() \ value = 0 \ // EEPROM is 512 bytes by default; it is autodetecte as 8KB if // 14bit address DMAs are made (this is done in the DMA handler). eeprom_size_type eeprom_size = EEPROM_512_BYTE; eeprom_mode_type eeprom_mode = EEPROM_BASE_MODE; u32 eeprom_address = 0; u32 eeprom_counter = 0; void function_cc write_eeprom(u32 unused_address, u32 value) { switch(eeprom_mode) { case EEPROM_BASE_MODE: backup_type = BACKUP_EEPROM; eeprom_address |= (value & 0x01) << (1 - eeprom_counter); if(++eeprom_counter == 2) { switch(eeprom_address & 0x03) { case 0x02: eeprom_mode = EEPROM_WRITE_ADDRESS_MODE; break; case 0x03: eeprom_mode = EEPROM_ADDRESS_MODE; break; } eeprom_counter = 0; eeprom_address = 0; } break; case EEPROM_ADDRESS_MODE: case EEPROM_WRITE_ADDRESS_MODE: eeprom_address |= (value & 0x01) << (15 - (eeprom_counter % 16)); if(++eeprom_counter == (eeprom_size == EEPROM_512_BYTE ? 6 : 14)) { eeprom_counter = 0; if (eeprom_size == EEPROM_512_BYTE) eeprom_address >>= 10; // Addr is just 6 bits (drop 10LSB) else eeprom_address >>= 2; // Addr is 14 bits (drop 2LSB) eeprom_address <<= 3; // EEPROM accessed in blocks of 8 bytes if(eeprom_mode == EEPROM_ADDRESS_MODE) eeprom_mode = EEPROM_ADDRESS_FOOTER_MODE; else { eeprom_mode = EEPROM_WRITE_MODE; memset(gamepak_backup + eeprom_address, 0, 8); } } break; case EEPROM_WRITE_MODE: gamepak_backup[eeprom_address + (eeprom_counter / 8)] |= (value & 0x01) << (7 - (eeprom_counter % 8)); eeprom_counter++; if(eeprom_counter == 64) { eeprom_counter = 0; eeprom_mode = EEPROM_WRITE_FOOTER_MODE; } break; case EEPROM_ADDRESS_FOOTER_MODE: case EEPROM_WRITE_FOOTER_MODE: eeprom_counter = 0; if(eeprom_mode == EEPROM_ADDRESS_FOOTER_MODE) eeprom_mode = EEPROM_READ_HEADER_MODE; else eeprom_mode = EEPROM_BASE_MODE; break; default: break; } } #define read_memory_gamepak(type) \ u32 gamepak_index = address >> 15; \ u8 *map = memory_map_read[gamepak_index]; \ \ if(!map) \ map = load_gamepak_page(gamepak_index & 0x3FF); \ \ value = readaddress##type(map, address & 0x7FFF) \ #define read_open8() \ if(!(reg[REG_CPSR] & 0x20)) \ value = read_memory8(reg[REG_PC] + 4 + (address & 0x03)); \ else \ value = read_memory8(reg[REG_PC] + 2 + (address & 0x01)) \ #define read_open16() \ if(!(reg[REG_CPSR] & 0x20)) \ value = read_memory16(reg[REG_PC] + 4 + (address & 0x02)); \ else \ value = read_memory16(reg[REG_PC] + 2) \ #define read_open32() \ if(!(reg[REG_CPSR] & 0x20)) \ value = read_memory32(reg[REG_PC] + 4); \ else \ { \ u32 current_instruction = read_memory16(reg[REG_PC] + 2); \ value = current_instruction | (current_instruction << 16); \ } \ u32 function_cc read_eeprom(void) { u32 value; switch(eeprom_mode) { case EEPROM_BASE_MODE: value = 1; break; case EEPROM_READ_MODE: value = (gamepak_backup[eeprom_address + (eeprom_counter / 8)] >> (7 - (eeprom_counter % 8))) & 0x01; eeprom_counter++; if(eeprom_counter == 64) { eeprom_counter = 0; eeprom_mode = EEPROM_BASE_MODE; } break; case EEPROM_READ_HEADER_MODE: value = 0; eeprom_counter++; if(eeprom_counter == 4) { eeprom_mode = EEPROM_READ_MODE; eeprom_counter = 0; } break; default: value = 0; break; } return value; } #define read_memory(type) \ switch(address >> 24) \ { \ case 0x00: \ /* BIOS */ \ if(reg[REG_PC] >= 0x4000) \ ror(value, bios_read_protect, (address & 0x03) << 3); \ else \ value = readaddress##type(bios_rom, address & 0x3FFF); \ break; \ \ case 0x02: \ /* external work RAM */ \ value = readaddress##type(ewram, (address & 0x3FFFF)); \ break; \ \ case 0x03: \ /* internal work RAM */ \ value = readaddress##type(iwram, (address & 0x7FFF) + 0x8000); \ break; \ \ case 0x04: \ /* I/O registers */ \ value = readaddress##type(io_registers, address & 0x3FF); \ break; \ \ case 0x05: \ /* palette RAM */ \ value = readaddress##type(palette_ram, address & 0x3FF); \ break; \ \ case 0x06: \ /* VRAM */ \ address &= 0x1FFFF; \ if(address >= 0x18000) \ address -= 0x8000; \ \ value = readaddress##type(vram, address); \ break; \ \ case 0x07: \ /* OAM RAM */ \ value = readaddress##type(oam_ram, address & 0x3FF); \ break; \ \ case 0x08: \ case 0x09: \ case 0x0A: \ case 0x0B: \ case 0x0C: \ /* gamepak ROM */ \ if((address & 0x1FFFFFF) >= gamepak_size) \ value = 0; \ else \ { \ read_memory_gamepak(type); \ } \ break; \ \ case 0x0D: \ if((address & 0x1FFFFFF) < gamepak_size) \ { \ read_memory_gamepak(type); \ } \ else \ value = read_eeprom(); \ \ break; \ \ case 0x0E: \ case 0x0F: \ read_backup##type(); \ break; \ \ default: \ read_open##type(); \ break; \ } \ static cpu_alert_type trigger_dma(u32 dma_number, u32 value) { if(value & 0x8000) { if(dma[dma_number].start_type == DMA_INACTIVE) { dma_start_type start_type = (dma_start_type)((value >> 12) & 0x03); u32 src_address = 0xFFFFFFF & (read_dmareg(REG_DMA0SAD, dma_number) | (read_dmareg(REG_DMA0SAD + 1, dma_number) << 16)); u32 dst_address = 0xFFFFFFF & (read_dmareg(REG_DMA0DAD, dma_number) | (read_dmareg(REG_DMA0DAD + 1, dma_number) << 16)); dma[dma_number].source_address = src_address; dma[dma_number].dest_address = dst_address; dma[dma_number].source_direction = (dma_increment_type)((value >> 7) & 3); dma[dma_number].repeat_type = (dma_repeat_type)((value >> 9) & 0x01); dma[dma_number].start_type = start_type; dma[dma_number].irq = (dma_irq_type)((value >> 14) & 0x1); /* If it is sound FIFO DMA make sure the settings are a certain way */ if((dma_number >= 1) && (dma_number <= 2) && (start_type == DMA_START_SPECIAL)) { dma[dma_number].length_type = DMA_32BIT; dma[dma_number].length = 4; dma[dma_number].dest_direction = DMA_FIXED; if(dst_address == 0x40000A4) dma[dma_number].direct_sound_channel = DMA_DIRECT_SOUND_B; else dma[dma_number].direct_sound_channel = DMA_DIRECT_SOUND_A; } else { u32 length = read_dmareg(REG_DMA0CNT_L, dma_number); if((dma_number == 3) && ((dst_address >> 24) == 0x0D) && ((length & 0x1F) == 17)) eeprom_size = EEPROM_8_KBYTE; if(dma_number < 3) length &= 0x3FFF; if(length == 0) { if(dma_number == 3) length = 0x10000; else length = 0x04000; } dma[dma_number].length = length; dma[dma_number].length_type = (dma_length_type)((value >> 10) & 0x01); dma[dma_number].dest_direction = (dma_increment_type)((value >> 5) & 3); } write_dmareg(REG_DMA0CNT_H, dma_number, value); if(start_type == DMA_START_IMMEDIATELY) return dma_transfer(dma_number); } } else { dma[dma_number].start_type = DMA_INACTIVE; dma[dma_number].direct_sound_channel = DMA_NO_DIRECT_SOUND; write_dmareg(REG_DMA0CNT_H, dma_number, value); } return CPU_ALERT_NONE; } #define access_register8_high(address) \ value = (value << 8) | (address8(io_registers, address)) \ #define access_register8_low(address) \ value = ((address8(io_registers, address + 1)) << 8) | value \ #define access_register16_high(address) \ value = (value << 16) | (readaddress16(io_registers, address)) \ #define access_register16_low(address) \ value = ((readaddress16(io_registers, address + 2)) << 16) | value \ cpu_alert_type function_cc write_io_register8(u32 address, u32 value) { value &= 0xff; switch(address) { case 0x00: { u32 dispcnt = read_ioreg(REG_DISPCNT); if((value & 0x07) != (dispcnt & 0x07)) reg[OAM_UPDATED] = 1; address8(io_registers, 0x00) = value; break; } // DISPSTAT (lower byte) case 0x04: address8(io_registers, 0x04) = (address8(io_registers, 0x04) & 0x07) | (value & ~0x07); break; // VCOUNT case 0x06: case 0x07: break; // BG2 reference X case 0x28: access_register8_low(0x28); access_register16_low(0x28); affine_reference_x[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x28) = eswap32(value); break; case 0x29: access_register8_high(0x28); access_register16_low(0x28); affine_reference_x[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x28) = eswap32(value); break; case 0x2A: access_register8_low(0x2A); access_register16_high(0x28); affine_reference_x[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x28) = eswap32(value); break; case 0x2B: access_register8_high(0x2A); access_register16_high(0x28); affine_reference_x[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x28) = eswap32(value); break; // BG2 reference Y case 0x2C: access_register8_low(0x2C); access_register16_low(0x2C); affine_reference_y[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x2C) = eswap32(value); break; case 0x2D: access_register8_high(0x2C); access_register16_low(0x2C); affine_reference_y[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x2C) = eswap32(value); break; case 0x2E: access_register8_low(0x2E); access_register16_high(0x2C); affine_reference_y[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x2C) = eswap32(value); break; case 0x2F: access_register8_high(0x2E); access_register16_high(0x2C); affine_reference_y[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x2C) = eswap32(value); break; // BG3 reference X case 0x38: access_register8_low(0x38); access_register16_low(0x38); affine_reference_x[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x38) = eswap32(value); break; case 0x39: access_register8_high(0x38); access_register16_low(0x38); affine_reference_x[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x38) = eswap32(value); break; case 0x3A: access_register8_low(0x3A); access_register16_high(0x38); affine_reference_x[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x38) = eswap32(value); break; case 0x3B: access_register8_high(0x3A); access_register16_high(0x38); affine_reference_x[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x38) = eswap32(value); break; // BG3 reference Y case 0x3C: access_register8_low(0x3C); access_register16_low(0x3C); affine_reference_y[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x3C) = eswap32(value); break; case 0x3D: access_register8_high(0x3C); access_register16_low(0x3C); affine_reference_y[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x3C) = eswap32(value); break; case 0x3E: access_register8_low(0x3E); access_register16_high(0x3C); affine_reference_y[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x3C) = eswap32(value); break; case 0x3F: access_register8_high(0x3E); access_register16_high(0x3C); affine_reference_y[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x3C) = eswap32(value); break; // Sound 1 control sweep case 0x60: access_register8_low(0x60); gbc_sound_tone_control_sweep(); break; case 0x61: access_register8_low(0x60); gbc_sound_tone_control_sweep(); break; // Sound 1 control duty/length/envelope case 0x62: access_register8_low(0x62); gbc_sound_tone_control_low(0, REG_SOUND1CNT_H); break; case 0x63: access_register8_high(0x62); gbc_sound_tone_control_low(0, REG_SOUND1CNT_H); break; // Sound 1 control frequency case 0x64: access_register8_low(0x64); gbc_sound_tone_control_high(0, REG_SOUND1CNT_X); break; case 0x65: access_register8_high(0x64); gbc_sound_tone_control_high(0, REG_SOUND1CNT_X); break; // Sound 2 control duty/length/envelope case 0x68: access_register8_low(0x68); gbc_sound_tone_control_low(1, REG_SOUND2CNT_L); break; case 0x69: access_register8_high(0x68); gbc_sound_tone_control_low(1, REG_SOUND2CNT_L); break; // Sound 2 control frequency case 0x6C: access_register8_low(0x6C); gbc_sound_tone_control_high(1, REG_SOUND2CNT_H); break; case 0x6D: access_register8_high(0x6C); gbc_sound_tone_control_high(1, REG_SOUND2CNT_H); break; // Sound 3 control wave case 0x70: access_register8_low(0x70); gbc_sound_wave_control(); break; case 0x71: access_register8_high(0x70); gbc_sound_wave_control(); break; // Sound 3 control length/volume case 0x72: access_register8_low(0x72); gbc_sound_tone_control_low_wave(); break; case 0x73: access_register8_high(0x72); gbc_sound_tone_control_low_wave(); break; // Sound 3 control frequency case 0x74: access_register8_low(0x74); gbc_sound_tone_control_high_wave(); break; case 0x75: access_register8_high(0x74); gbc_sound_tone_control_high_wave(); break; // Sound 4 control length/envelope case 0x78: access_register8_low(0x78); gbc_sound_tone_control_low(3, REG_SOUND4CNT_L); break; case 0x79: access_register8_high(0x78); gbc_sound_tone_control_low(3, REG_SOUND4CNT_L); break; // Sound 4 control frequency case 0x7C: access_register8_low(0x7C); gbc_sound_noise_control(); break; case 0x7D: access_register8_high(0x7C); gbc_sound_noise_control(); break; // Sound control L case 0x80: access_register8_low(0x80); gbc_trigger_sound(value); break; case 0x81: access_register8_high(0x80); gbc_trigger_sound(value); break; // Sound control H case 0x82: access_register8_low(0x82); trigger_sound(); break; case 0x83: access_register8_high(0x82); trigger_sound(); break; // Sound control X case 0x84: sound_control_x(value); break; // Sound wave RAM case 0x90 ... 0x9F: gbc_sound_wave_update = 1; address8(io_registers, address) = value; break; // Sound FIFO A case 0xA0: sound_timer_queue8(0, value); break; // Sound FIFO B case 0xA4: sound_timer_queue8(1, value); break; // DMA control (trigger byte) case 0xBB: access_register8_low(0xBA); return trigger_dma(0, value); case 0xC7: access_register8_low(0xC6); return trigger_dma(1, value); case 0xD3: access_register8_low(0xD2); return trigger_dma(2, value); case 0xDF: access_register8_low(0xDE); return trigger_dma(3, value); // Timer counts case 0x100: access_register8_low(0x100); count_timer(0); break; case 0x101: access_register8_high(0x100); count_timer(0); break; case 0x104: access_register8_low(0x104); count_timer(1); break; case 0x105: access_register8_high(0x104); count_timer(1); break; case 0x108: access_register8_low(0x108); count_timer(2); break; case 0x109: access_register8_high(0x108); count_timer(2); break; case 0x10C: access_register8_low(0x10C); count_timer(3); break; case 0x10D: access_register8_high(0x10C); count_timer(3); break; // Timer control (trigger byte) case 0x103: access_register8_low(0x102); trigger_timer(0, value); break; case 0x107: access_register8_low(0x106); trigger_timer(1, value); break; case 0x10B: access_register8_low(0x10A); trigger_timer(2, value); break; case 0x10F: access_register8_low(0x10E); trigger_timer(3, value); break; // IF case 0x202: address8(io_registers, 0x202) &= ~value; break; case 0x203: address8(io_registers, 0x203) &= ~value; break; // Halt case 0x301: if((value & 0x01) == 0) reg[CPU_HALT_STATE] = CPU_HALT; else reg[CPU_HALT_STATE] = CPU_STOP; return CPU_ALERT_HALT; break; default: address8(io_registers, address) = value; break; } return CPU_ALERT_NONE; } cpu_alert_type function_cc write_io_register16(u32 address, u32 value) { value &= 0xffff; switch(address) { case 0x00: { u32 dispcnt = read_ioreg(REG_DISPCNT); if((value & 0x07) != (dispcnt & 0x07)) reg[OAM_UPDATED] = 1; write_ioreg(REG_DISPCNT, value); break; } // DISPSTAT case 0x04: write_ioreg(REG_DISPSTAT, (read_ioreg(REG_DISPSTAT) & 0x07) | (value & ~0x07)); break; // VCOUNT case 0x06: break; // BG2 reference X case 0x28: access_register16_low(0x28); affine_reference_x[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x28) = eswap32(value); break; case 0x2A: access_register16_high(0x28); affine_reference_x[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x28) = eswap32(value); break; // BG2 reference Y case 0x2C: access_register16_low(0x2C); affine_reference_y[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x2C) = eswap32(value); break; case 0x2E: access_register16_high(0x2C); affine_reference_y[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x2C) = eswap32(value); break; // BG3 reference X case 0x38: access_register16_low(0x38); affine_reference_x[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x38) = eswap32(value); break; case 0x3A: access_register16_high(0x38); affine_reference_x[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x38) = eswap32(value); break; // BG3 reference Y case 0x3C: access_register16_low(0x3C); affine_reference_y[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x3C) = eswap32(value); break; case 0x3E: access_register16_high(0x3C); affine_reference_y[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x3C) = eswap32(value); break; // Sound 1 control sweep case 0x60: gbc_sound_tone_control_sweep(); break; // Sound 1 control duty/length/envelope case 0x62: gbc_sound_tone_control_low(0, REG_SOUND1CNT_H); break; // Sound 1 control frequency case 0x64: gbc_sound_tone_control_high(0, REG_SOUND1CNT_X); break; // Sound 2 control duty/length/envelope case 0x68: gbc_sound_tone_control_low(1, REG_SOUND2CNT_L); break; // Sound 2 control frequency case 0x6C: gbc_sound_tone_control_high(1, REG_SOUND2CNT_H); break; // Sound 3 control wave case 0x70: gbc_sound_wave_control(); break; // Sound 3 control length/volume case 0x72: gbc_sound_tone_control_low_wave(); break; // Sound 3 control frequency case 0x74: gbc_sound_tone_control_high_wave(); break; // Sound 4 control length/envelope case 0x78: gbc_sound_tone_control_low(3, REG_SOUND4CNT_L); break; // Sound 4 control frequency case 0x7C: gbc_sound_noise_control(); break; // Sound control L case 0x80: gbc_trigger_sound(value); break; // Sound control H case 0x82: trigger_sound(); break; // Sound control X case 0x84: sound_control_x(value); break; // Sound wave RAM case 0x90 ... 0x9E: gbc_sound_wave_update = 1; address16(io_registers, address) = eswap16(value); break; // Sound FIFO A case 0xA0: sound_timer_queue16(0, value); break; // Sound FIFO B case 0xA4: sound_timer_queue16(1, value); break; // DMA control case 0xBA: return trigger_dma(0, value); case 0xC6: return trigger_dma(1, value); case 0xD2: return trigger_dma(2, value); case 0xDE: return trigger_dma(3, value); // Timer counts case 0x100: count_timer(0); break; case 0x104: count_timer(1); break; case 0x108: count_timer(2); break; case 0x10C: count_timer(3); break; /* Timer control 0 */ case 0x102: trigger_timer(0, value); break; /* Timer control 1 */ case 0x106: trigger_timer(1, value); break; /* Timer control 2 */ case 0x10A: trigger_timer(2, value); break; /* Timer control 3 */ case 0x10E: trigger_timer(3, value); break; // P1 case 0x130: break; // Interrupt flag case 0x202: write_ioreg(REG_IF, read_ioreg(REG_IF) & (~value)); break; // WAITCNT case 0x204: break; // Halt case 0x300: if(((value >> 8) & 0x01) == 0) reg[CPU_HALT_STATE] = CPU_HALT; else reg[CPU_HALT_STATE] = CPU_STOP; return CPU_ALERT_HALT; default: address16(io_registers, address) = eswap16(value); break; } return CPU_ALERT_NONE; } cpu_alert_type function_cc write_io_register32(u32 address, u32 value) { switch(address) { // BG2 reference X case 0x28: affine_reference_x[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x28) = eswap32(value); break; // BG2 reference Y case 0x2C: affine_reference_y[0] = (s32)(value << 4) >> 4; address32(io_registers, 0x2C) = eswap32(value); break; // BG3 reference X case 0x38: affine_reference_x[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x38) = eswap32(value); break; // BG3 reference Y case 0x3C: affine_reference_y[1] = (s32)(value << 4) >> 4; address32(io_registers, 0x3C) = eswap32(value); break; // Sound FIFO A case 0xA0: sound_timer_queue32(0, value); break; // Sound FIFO B case 0xA4: sound_timer_queue32(1, value); break; default: { cpu_alert_type alert_low = write_io_register16(address, value & 0xFFFF); cpu_alert_type alert_high = write_io_register16(address + 2, value >> 16); if(alert_high) return alert_high; return alert_low; } } return CPU_ALERT_NONE; } #define write_palette8(address, value) \ #define write_palette16(address, value) \ { \ u32 palette_address = address; \ address16(palette_ram, palette_address) = eswap16(value); \ value = convert_palette(value); \ address16(palette_ram_converted, palette_address) = value; \ } \ #define write_palette32(address, value) \ { \ u32 palette_address = address; \ u32 value_high = value >> 16; \ u32 value_low = value & 0xFFFF; \ address32(palette_ram, palette_address) = eswap32(value); \ value_high = convert_palette(value_high); \ address16(palette_ram_converted, palette_address + 2) = value_high; \ value_low = convert_palette(value_low); \ address16(palette_ram_converted, palette_address) = value_low; \ } \ void function_cc write_backup(u32 address, u32 value) { value &= 0xFF; if(backup_type == BACKUP_NONE) backup_type = BACKUP_SRAM; // gamepak SRAM or Flash ROM if((address == 0x5555) && (flash_mode != FLASH_WRITE_MODE)) { if((flash_command_position == 0) && (value == 0xAA)) { backup_type = BACKUP_FLASH; flash_command_position = 1; } if(flash_command_position == 2) { switch(value) { case 0x90: // Enter ID mode, this also tells the emulator that we're using // flash, not SRAM if(flash_mode == FLASH_BASE_MODE) flash_mode = FLASH_ID_MODE; break; case 0x80: // Enter erase mode if(flash_mode == FLASH_BASE_MODE) flash_mode = FLASH_ERASE_MODE; break; case 0xF0: // Terminate ID mode if(flash_mode == FLASH_ID_MODE) flash_mode = FLASH_BASE_MODE; break; case 0xA0: // Write mode if(flash_mode == FLASH_BASE_MODE) flash_mode = FLASH_WRITE_MODE; break; case 0xB0: // Bank switch // Here the chip is now officially 128KB. flash_size = FLASH_SIZE_128KB; if(flash_mode == FLASH_BASE_MODE) flash_mode = FLASH_BANKSWITCH_MODE; break; case 0x10: // Erase chip if(flash_mode == FLASH_ERASE_MODE) { if(flash_size == FLASH_SIZE_64KB) memset(gamepak_backup, 0xFF, 1024 * 64); else memset(gamepak_backup, 0xFF, 1024 * 128); flash_mode = FLASH_BASE_MODE; } break; default: break; } flash_command_position = 0; } if(backup_type == BACKUP_SRAM) gamepak_backup[0x5555] = value; } else if((address == 0x2AAA) && (value == 0x55) && (flash_command_position == 1)) flash_command_position = 2; else { if((flash_command_position == 2) && (flash_mode == FLASH_ERASE_MODE) && (value == 0x30)) { // Erase sector u32 fulladdr = (address & 0xF000) + 64*1024*flash_bank_num; memset(&gamepak_backup[fulladdr], 0xFF, 1024 * 4); flash_mode = FLASH_BASE_MODE; flash_command_position = 0; } else if((flash_command_position == 0) && (flash_mode == FLASH_BANKSWITCH_MODE) && (address == 0x0000) && (flash_size == FLASH_SIZE_128KB)) { flash_bank_num = value & 1; flash_mode = FLASH_BASE_MODE; } else if((flash_command_position == 0) && (flash_mode == FLASH_WRITE_MODE)) { // Write value to flash ROM u32 fulladdr = address + 64*1024*flash_bank_num; gamepak_backup[fulladdr] = value; flash_mode = FLASH_BASE_MODE; } else if(backup_type == BACKUP_SRAM) { // Write value to SRAM // Hit 64KB territory? if(address >= 0x8000) sram_size = SRAM_SIZE_64KB; gamepak_backup[address] = value; } } } #define write_backup8() \ write_backup(address & 0xFFFF, value) \ #define write_backup16() \ #define write_backup32() \ #define write_vram8() \ address &= ~0x01; \ address16(vram, address) = eswap16((value << 8) | value) \ #define write_vram16() \ address16(vram, address) = eswap16(value) \ #define write_vram32() \ address32(vram, address) = eswap32(value) \ // RTC code derived from VBA's (due to lack of any real publically available // documentation...) typedef enum { RTC_DISABLED, RTC_IDLE, RTC_COMMAND, RTC_OUTPUT_DATA, RTC_INPUT_DATA } rtc_state_type; typedef enum { RTC_COMMAND_RESET = 0x60, RTC_COMMAND_WRITE_STATUS = 0x62, RTC_COMMAND_READ_STATUS = 0x63, RTC_COMMAND_OUTPUT_TIME_FULL = 0x65, RTC_COMMAND_OUTPUT_TIME = 0x67 } rtc_command_type; typedef enum { RTC_WRITE_TIME, RTC_WRITE_TIME_FULL, RTC_WRITE_STATUS } rtc_write_mode_type; rtc_state_type rtc_state = RTC_DISABLED; rtc_write_mode_type rtc_write_mode; u8 rtc_registers[3]; u32 rtc_command; u32 rtc_data[12]; u32 rtc_status = 0x40; u32 rtc_data_bytes; s32 rtc_bit_count; static u32 encode_bcd(u8 value) { int l = 0; int h = 0; value = value % 100; l = value % 10; h = value / 10; return h * 16 + l; } // RTC writes need to reflect in the bytes [0xC4..0xC9] of the gamepak #define write_rtc_register(index, _value) \ update_address = 0x80000C4 + (index * 2); \ rtc_registers[index] = _value; \ rtc_page_index = update_address >> 15; \ map = memory_map_read[rtc_page_index]; \ \ if(map) { \ address16(map, update_address & 0x7FFF) = eswap16(_value); \ } \ void function_cc write_rtc(u32 address, u32 value) { u32 rtc_page_index; u32 update_address; u8 *map; value &= 0xFFFF; switch(address) { // RTC command // Bit 0: SCHK, perform action // Bit 1: IO, input/output command data // Bit 2: CS, select input/output? If high make I/O write only case 0xC4: if(rtc_state == RTC_DISABLED) rtc_state = RTC_IDLE; if(!(rtc_registers[0] & 0x04)) value = (rtc_registers[0] & 0x02) | (value & ~0x02); if(rtc_registers[2] & 0x01) { // To begin writing a command 1, 5 must be written to the command // registers. if((rtc_state == RTC_IDLE) && (rtc_registers[0] == 0x01) && (value == 0x05)) { // We're now ready to begin receiving a command. write_rtc_register(0, value); rtc_state = RTC_COMMAND; rtc_command = 0; rtc_bit_count = 7; } else { write_rtc_register(0, value); switch(rtc_state) { // Accumulate RTC command by receiving the next bit, and if we // have accumulated enough bits to form a complete command // execute it. case RTC_COMMAND: if(rtc_registers[0] & 0x01) { rtc_command |= ((value & 0x02) >> 1) << rtc_bit_count; rtc_bit_count--; } // Have we received a full RTC command? If so execute it. if(rtc_bit_count < 0) { switch(rtc_command) { // Resets RTC case RTC_COMMAND_RESET: rtc_state = RTC_IDLE; memset(rtc_registers, 0, sizeof(rtc_registers)); break; // Sets status of RTC case RTC_COMMAND_WRITE_STATUS: rtc_state = RTC_INPUT_DATA; rtc_data_bytes = 1; rtc_write_mode = RTC_WRITE_STATUS; break; // Outputs current status of RTC case RTC_COMMAND_READ_STATUS: rtc_state = RTC_OUTPUT_DATA; rtc_data_bytes = 1; rtc_data[0] = rtc_status; break; // Actually outputs the time, all of it case RTC_COMMAND_OUTPUT_TIME_FULL: { struct tm *current_time; time_t current_time_flat; time(¤t_time_flat); current_time = localtime(¤t_time_flat); rtc_state = RTC_OUTPUT_DATA; rtc_data_bytes = 7; rtc_data[0] = encode_bcd(current_time->tm_year); rtc_data[1] = encode_bcd(current_time->tm_mon + 1); rtc_data[2] = encode_bcd(current_time->tm_mday); rtc_data[3] = encode_bcd(current_time->tm_wday); rtc_data[4] = encode_bcd(current_time->tm_hour); rtc_data[5] = encode_bcd(current_time->tm_min); rtc_data[6] = encode_bcd(current_time->tm_sec); break; } // Only outputs the current time of day. case RTC_COMMAND_OUTPUT_TIME: { struct tm *current_time; time_t current_time_flat; time(¤t_time_flat); current_time = localtime(¤t_time_flat); rtc_state = RTC_OUTPUT_DATA; rtc_data_bytes = 3; rtc_data[0] = encode_bcd(current_time->tm_hour); rtc_data[1] = encode_bcd(current_time->tm_min); rtc_data[2] = encode_bcd(current_time->tm_sec); break; } } rtc_bit_count = 0; } break; // Receive parameters from the game as input to the RTC // for a given command. Read one bit at a time. case RTC_INPUT_DATA: // Bit 1 of parameter A must be high for input if(rtc_registers[1] & 0x02) { // Read next bit for input if(!(value & 0x01)) { rtc_data[rtc_bit_count >> 3] |= ((value & 0x01) << (7 - (rtc_bit_count & 0x07))); } else { rtc_bit_count++; if(rtc_bit_count == (signed)(rtc_data_bytes * 8)) { rtc_state = RTC_IDLE; switch(rtc_write_mode) { case RTC_WRITE_STATUS: rtc_status = rtc_data[0]; break; default: break; } } } } break; case RTC_OUTPUT_DATA: // Bit 1 of parameter A must be low for output if(!(rtc_registers[1] & 0x02)) { // Write next bit to output, on bit 1 of parameter B if(!(value & 0x01)) { u8 current_output_byte = rtc_registers[2]; current_output_byte = (current_output_byte & ~0x02) | (((rtc_data[rtc_bit_count >> 3] >> (rtc_bit_count & 0x07)) & 0x01) << 1); write_rtc_register(0, current_output_byte); } else { rtc_bit_count++; if(rtc_bit_count == (signed)(rtc_data_bytes * 8)) { rtc_state = RTC_IDLE; memset(rtc_registers, 0, sizeof(rtc_registers)); } } } break; default: break; } } } else { write_rtc_register(2, value); } break; // Write parameter A case 0xC6: write_rtc_register(1, value); break; // Write parameter B case 0xC8: write_rtc_register(2, value); break; } } #define write_rtc8() \ #define write_rtc16() \ write_rtc(address & 0xFF, value) \ #define write_rtc32() \ #define write_memory(type) \ switch(address >> 24) \ { \ case 0x02: \ /* external work RAM */ \ address##type(ewram, (address & 0x3FFFF)) = eswap##type(value); \ break; \ \ case 0x03: \ /* internal work RAM */ \ address##type(iwram, (address & 0x7FFF) + 0x8000) = eswap##type(value); \ break; \ \ case 0x04: \ /* I/O registers */ \ return write_io_register##type(address & 0x3FF, value); \ \ case 0x05: \ /* palette RAM */ \ write_palette##type(address & 0x3FF, value); \ break; \ \ case 0x06: \ /* VRAM */ \ address &= 0x1FFFF; \ if(address >= 0x18000) \ address -= 0x8000; \ \ write_vram##type(); \ break; \ \ case 0x07: \ /* OAM RAM */ \ reg[OAM_UPDATED] = 1; \ address##type(oam_ram, address & 0x3FF) = eswap##type(value); \ break; \ \ case 0x08: \ /* gamepak ROM or RTC */ \ write_rtc##type(); \ break; \ \ case 0x09: \ case 0x0A: \ case 0x0B: \ case 0x0C: \ /* gamepak ROM space */ \ break; \ \ case 0x0D: \ write_eeprom(address, value); \ break; \ \ case 0x0E: \ write_backup##type(); \ break; \ } \ u8 function_cc read_memory8(u32 address) { u8 value; read_memory(8); return value; } u32 read_memory8s(u32 address) { return (u32)((s8)read_memory8(address)); } u16 function_cc read_memory16_signed(u32 address) { u16 value; if(address & 0x01) return (s8)read_memory8(address); read_memory(16); return value; } u32 read_memory16s(u32 address) { return (u32)((s16)read_memory16_signed(address)); } // unaligned reads are actually 32bit u32 function_cc read_memory16(u32 address) { u32 value; bool unaligned = (address & 0x01); address &= ~0x01; read_memory(16); if (unaligned) { ror(value, value, 8); } return value; } u32 function_cc read_memory32(u32 address) { u32 value; u32 rotate = (address & 0x03) * 8; address &= ~0x03; read_memory(32); ror(value, value, rotate); return value; } cpu_alert_type function_cc write_memory8(u32 address, u8 value) { write_memory(8); return CPU_ALERT_NONE; } cpu_alert_type function_cc write_memory16(u32 address, u16 value) { write_memory(16); return CPU_ALERT_NONE; } cpu_alert_type function_cc write_memory32(u32 address, u32 value) { write_memory(32); return CPU_ALERT_NONE; } char backup_filename[512]; u32 load_backup(char *name) { FILE *fd = fopen(name, "rb"); if(fd) { u32 backup_size = file_length(fd); fread(gamepak_backup, 1, backup_size, fd); fclose(fd); // The size might give away what kind of backup it is. switch(backup_size) { case 0x200: backup_type = BACKUP_EEPROM; eeprom_size = EEPROM_512_BYTE; break; case 0x2000: backup_type = BACKUP_EEPROM; eeprom_size = EEPROM_8_KBYTE; break; case 0x8000: backup_type = BACKUP_SRAM; sram_size = SRAM_SIZE_32KB; break; // Could be either flash or SRAM, go with flash case 0x10000: backup_type = BACKUP_FLASH; sram_size = (sram_size_type)FLASH_SIZE_64KB; break; case 0x20000: backup_type = BACKUP_FLASH; flash_size = FLASH_SIZE_128KB; break; } return 1; } else { backup_type = BACKUP_NONE; memset(gamepak_backup, 0xFF, 1024 * 128); } return 0; } u32 save_backup(char *name) { if(backup_type != BACKUP_NONE) { FILE *fd = fopen(name, "wb"); if(fd) { u32 backup_size = 0; switch(backup_type) { case BACKUP_SRAM: if(sram_size == SRAM_SIZE_32KB) backup_size = 0x8000; else backup_size = 0x10000; break; case BACKUP_FLASH: if(flash_size == FLASH_SIZE_64KB) backup_size = 0x10000; else backup_size = 0x20000; break; case BACKUP_EEPROM: if(eeprom_size == EEPROM_512_BYTE) backup_size = 0x200; else backup_size = 0x2000; break; default: break; } fwrite(gamepak_backup, 1, backup_size, fd); fclose(fd); return 1; } } return 0; } void update_backup(void) { if (!use_libretro_save_method) save_backup(backup_filename); } #define CONFIG_FILENAME "game_config.txt" static char *skip_spaces(char *line_ptr) { while(*line_ptr == ' ') line_ptr++; return line_ptr; } static s32 parse_config_line(char *current_line, char *current_variable, char *current_value) { char *line_ptr = current_line; char *line_ptr_new; if((current_line[0] == 0) || (current_line[0] == '#')) return -1; line_ptr_new = strchr(line_ptr, ' '); if(!line_ptr_new) return -1; *line_ptr_new = 0; strcpy(current_variable, line_ptr); line_ptr_new = skip_spaces(line_ptr_new + 1); if(*line_ptr_new != '=') return -1; line_ptr_new = skip_spaces(line_ptr_new + 1); strcpy(current_value, line_ptr_new); line_ptr_new = current_value + strlen(current_value) - 1; if(*line_ptr_new == '\n') { line_ptr_new--; *line_ptr_new = 0; } if(*line_ptr_new == '\r') *line_ptr_new = 0; return 0; } typedef struct { char gamepak_title[13]; char gamepak_code[5]; char gamepak_maker[3]; int flash_size; flash_device_id_type flash_device_id; int save_type; int rtc_enabled; int mirroring_enabled; int use_bios; u32 idle_loop_target_pc; u32 iwram_stack_optimize; u32 translation_gate_target_1; u32 translation_gate_target_2; u32 translation_gate_target_3; } ini_t; typedef struct { char gamepak_title[13]; char gamepak_code[5]; char gamepak_maker[3]; } gamepak_info_t; #include "gba_over.h" static s32 load_game_config_over(gamepak_info_t *gpinfo) { unsigned i = 0; for (i = 0; i < sizeof(gbaover)/sizeof(gbaover[0]); i++) { if (strcmp(gbaover[i].gamepak_code, gpinfo->gamepak_code)) continue; if (strcmp(gbaover[i].gamepak_title, gpinfo->gamepak_title)) continue; printf("gamepak title: %s\n", gbaover[i].gamepak_title); printf("gamepak code : %s\n", gbaover[i].gamepak_code); printf("gamepak maker: %s\n", gbaover[i].gamepak_maker); printf("INPUT gamepak title: %s\n", gpinfo->gamepak_title); printf("INPUT gamepak code : %s\n", gpinfo->gamepak_code); printf("INPUT gamepak maker: %s\n", gpinfo->gamepak_maker); if (gbaover[i].idle_loop_target_pc != 0) idle_loop_target_pc = gbaover[i].idle_loop_target_pc; iwram_stack_optimize = gbaover[i].iwram_stack_optimize; flash_device_id = gbaover[i].flash_device_id; if (flash_device_id == FLASH_DEVICE_MACRONIX_128KB) flash_size = FLASH_SIZE_128KB; if (gbaover[i].translation_gate_target_1 != 0) { translation_gate_target_pc[translation_gate_targets] = gbaover[i].translation_gate_target_1; translation_gate_targets++; } if (gbaover[i].translation_gate_target_2 != 0) { translation_gate_target_pc[translation_gate_targets] = gbaover[i].translation_gate_target_2; translation_gate_targets++; } if (gbaover[i].translation_gate_target_3 != 0) { translation_gate_target_pc[translation_gate_targets] = gbaover[i].translation_gate_target_3; translation_gate_targets++; } printf("found entry in over ini file.\n"); return 0; } return -1; } static s32 load_game_config(gamepak_info_t *gpinfo) { char current_line[256]; char current_variable[256]; char current_value[256]; char config_path[512]; FILE *config_file; sprintf(config_path, "%s" PATH_SEPARATOR "%s", main_path, CONFIG_FILENAME); printf("config_path is : %s\n", config_path); config_file = fopen(config_path, "rb"); if(config_file) { while(fgets(current_line, 256, config_file)) { if(parse_config_line(current_line, current_variable, current_value) != -1) { if(strcmp(current_variable, "game_name") || strcmp(current_value, gpinfo->gamepak_title)) continue; if(!fgets(current_line, 256, config_file) || (parse_config_line(current_line, current_variable, current_value) == -1) || strcmp(current_variable, "game_code") || strcmp(current_value, gpinfo->gamepak_code)) continue; if(!fgets(current_line, 256, config_file) || (parse_config_line(current_line, current_variable, current_value) == -1) || strcmp(current_variable, "vender_code") || strcmp(current_value, gpinfo->gamepak_maker)) continue; while(fgets(current_line, 256, config_file)) { if(parse_config_line(current_line, current_variable, current_value) != -1) { if(!strcmp(current_variable, "game_name")) { fclose(config_file); return 0; } if(!strcmp(current_variable, "idle_loop_eliminate_target")) idle_loop_target_pc = strtol(current_value, NULL, 16); if(!strcmp(current_variable, "translation_gate_target")) { if(translation_gate_targets < MAX_TRANSLATION_GATES) { translation_gate_target_pc[translation_gate_targets] = strtol(current_value, NULL, 16); translation_gate_targets++; } } if(!strcmp(current_variable, "iwram_stack_optimize") && !strcmp(current_value, "no\0")) /* \0 for broken toolchain workaround */ iwram_stack_optimize = 0; if(!strcmp(current_variable, "flash_rom_type") && !strcmp(current_value, "128KB")) flash_device_id = FLASH_DEVICE_MACRONIX_128KB; } } fclose(config_file); return 0; } } fclose(config_file); } printf("game config missing\n"); return -1; } // DMA memory regions can be one of the following: // IWRAM - 32kb offset from the contiguous iwram region. // EWRAM - also contiguous but with self modifying code check mirror. // VRAM - 96kb offset from the contiguous vram region, should take care // Palette RAM - Converts palette entries when written to. // OAM RAM - Sets OAM modified flag to true. // I/O registers - Uses the I/O register function. // of mirroring properly. // Segmented RAM/ROM - a region >= 32kb, the translated address has to // be reloaded if it wraps around the limit (cartride ROM) // Ext - should be handled by the memory read/write function. // The following map determines the region of each (assumes DMA access // is not done out of bounds) typedef enum { DMA_REGION_IWRAM, DMA_REGION_EWRAM, DMA_REGION_VRAM, DMA_REGION_PALETTE_RAM, DMA_REGION_OAM_RAM, DMA_REGION_IO, DMA_REGION_GAMEPAK, DMA_REGION_EXT, DMA_REGION_BIOS, DMA_REGION_NULL } dma_region_type; const dma_region_type dma_region_map[17] = { DMA_REGION_BIOS, // 0x00 - BIOS DMA_REGION_NULL, // 0x01 - Nothing DMA_REGION_EWRAM, // 0x02 - EWRAM DMA_REGION_IWRAM, // 0x03 - IWRAM DMA_REGION_IO, // 0x04 - I/O registers DMA_REGION_PALETTE_RAM, // 0x05 - palette RAM DMA_REGION_VRAM, // 0x06 - VRAM DMA_REGION_OAM_RAM, // 0x07 - OAM RAM DMA_REGION_GAMEPAK, // 0x08 - gamepak ROM DMA_REGION_GAMEPAK, // 0x09 - gamepak ROM DMA_REGION_GAMEPAK, // 0x0A - gamepak ROM DMA_REGION_GAMEPAK, // 0x0B - gamepak ROM DMA_REGION_GAMEPAK, // 0x0C - gamepak ROM DMA_REGION_EXT, // 0x0D - EEPROM DMA_REGION_EXT, // 0x0E - gamepak SRAM/flash ROM DMA_REGION_EXT, // 0x0F - gamepak SRAM/flash ROM DMA_REGION_NULL // 0x10 - Not possible (undefined?) }; #define dma_print(src_op, dest_op, transfer_size, wb) \ printf("dma from %x (%s) to %x (%s) for %x (%s) (%s) (%d) (pc %x)\n", \ src_ptr, #src_op, dest_ptr, #dest_op, length, #transfer_size, #wb, \ dma->irq, reg[15]); \ #define dma_smc_vars_src() \ #define dma_smc_vars_dest() \ u32 smc_trigger = 0 \ #define dma_vars_iwram(type) \ dma_smc_vars_##type() \ #define dma_vars_ewram(type) \ dma_smc_vars_##type() #define dma_oam_ram_dest() \ reg[OAM_UPDATED] = 1 \ #define dma_vars_oam_ram(type) \ dma_oam_ram_##type() \ #define dma_vars_io(type) #define dma_vars_vram(type) #define dma_vars_palette_ram(type) #define dma_vars_bios(type) #define dma_vars_ext(type) #define dma_oam_ram_src() #define dma_segmented_load_src() \ memory_map_read[src_current_region] \ #define dma_vars_gamepak(type) \ u32 type##_new_region; \ u32 type##_current_region = type##_ptr >> 15; \ u8 *type##_address_block = dma_segmented_load_##type(); \ if(type##_address_block == NULL) \ { \ if((type##_ptr & 0x1FFFFFF) >= gamepak_size) \ break; \ type##_address_block = load_gamepak_page(type##_current_region & 0x3FF); \ } \ #define dma_gamepak_check_region(type) \ type##_new_region = (type##_ptr >> 15); \ if(type##_new_region != type##_current_region) \ { \ type##_current_region = type##_new_region; \ type##_address_block = dma_segmented_load_##type(); \ if(type##_address_block == NULL) \ { \ type##_address_block = \ load_gamepak_page(type##_current_region & 0x3FF); \ } \ } \ #define dma_read_iwram(type, transfer_size) \ read_value = readaddress##transfer_size(iwram + 0x8000, type##_ptr & 0x7FFF)\ #define dma_read_vram(type, transfer_size) { \ u32 rdaddr = type##_ptr & 0x1FFFF; \ if (rdaddr >= 0x18000) rdaddr -= 0x8000; \ read_value = readaddress##transfer_size(vram, rdaddr); \ } #define dma_read_io(type, transfer_size) \ read_value = readaddress##transfer_size(io_registers, type##_ptr & 0x3FF) \ #define dma_read_oam_ram(type, transfer_size) \ read_value = readaddress##transfer_size(oam_ram, type##_ptr & 0x3FF) \ #define dma_read_palette_ram(type, transfer_size) \ read_value = readaddress##transfer_size(palette_ram, type##_ptr & 0x3FF) \ #define dma_read_ewram(type, transfer_size) \ read_value = readaddress##transfer_size(ewram, type##_ptr & 0x3FFFF) \ #define dma_read_gamepak(type, transfer_size) \ dma_gamepak_check_region(type); \ read_value = readaddress##transfer_size(type##_address_block, \ type##_ptr & 0x7FFF) \ // DMAing from the BIOS is funny, just returns 0.. #define dma_read_bios(type, transfer_size) \ read_value = 0 \ #define dma_read_ext(type, transfer_size) \ read_value = read_memory##transfer_size(type##_ptr) \ #define dma_write_iwram(type, transfer_size) \ address##transfer_size(iwram + 0x8000, type##_ptr & 0x7FFF) = \ eswap##transfer_size(read_value); \ smc_trigger |= address##transfer_size(iwram, type##_ptr & 0x7FFF) \ #define dma_write_vram(type, transfer_size) { \ u32 wraddr = type##_ptr & 0x1FFFF; \ if (wraddr >= 0x18000) wraddr -= 0x8000; \ address##transfer_size(vram, wraddr) = eswap##transfer_size(read_value); \ } #define dma_write_io(type, transfer_size) \ write_io_register##transfer_size(type##_ptr & 0x3FF, read_value) \ #define dma_write_oam_ram(type, transfer_size) \ address##transfer_size(oam_ram, type##_ptr & 0x3FF) = \ eswap##transfer_size(read_value) \ #define dma_write_palette_ram(type, transfer_size) \ write_palette##transfer_size(type##_ptr & 0x3FF, read_value) \ #define dma_write_ext(type, transfer_size) \ write_memory##transfer_size(type##_ptr, read_value) \ #define dma_write_ewram(type, transfer_size) \ address##transfer_size(ewram, type##_ptr & 0x3FFFF) = \ eswap##transfer_size(read_value); \ smc_trigger |= address##transfer_size(ewram, \ (type##_ptr & 0x3FFFF) + 0x40000) \ #define dma_epilogue_iwram() \ if(smc_trigger) \ { \ /* Special return code indicating to retranslate to the CPU code */ \ return_value = CPU_ALERT_SMC; \ } \ #define dma_epilogue_ewram() \ if(smc_trigger) \ { \ /* Special return code indicating to retranslate to the CPU code */ \ return_value = CPU_ALERT_SMC; \ } \ #define dma_epilogue_vram() \ #define dma_epilogue_io() \ #define dma_epilogue_oam_ram() \ #define dma_epilogue_palette_ram() \ #define dma_epilogue_GAMEPAK() \ #define dma_epilogue_ext() \ #define print_line() \ dma_print(src_op, dest_op, transfer_size, wb); \ #define dma_transfer_loop_region(src_region_type, dest_region_type, src_op, \ dest_op, transfer_size, wb) \ { \ dma_vars_##src_region_type(src); \ dma_vars_##dest_region_type(dest); \ \ for(i = 0; i < length; i++) \ { \ dma_read_##src_region_type(src, transfer_size); \ dma_write_##dest_region_type(dest, transfer_size); \ src_ptr += src_op; \ dest_ptr += dest_op; \ } \ dma->source_address = src_ptr; \ if (wb) \ dma->dest_address = dest_ptr; \ dma_epilogue_##dest_region_type(); \ break; \ } \ #define dma_tf_loop_builder(transfer_size) \ cpu_alert_type dma_tf_loop##transfer_size( \ u32 src_ptr, u32 dest_ptr, int src_strd, int dest_strd, \ bool wb, u32 length, dma_transfer_type *dma) \ { \ u32 i; \ u32 read_value; \ cpu_alert_type return_value = CPU_ALERT_NONE; \ u32 src_region = src_ptr >> 24; \ u32 dest_region = dest_ptr >> 24; \ dma_region_type src_region_type = dma_region_map[src_region]; \ dma_region_type dest_region_type = dma_region_map[dest_region]; \ \ switch(src_region_type | (dest_region_type << 4)) \ { \ case (DMA_REGION_BIOS | (DMA_REGION_IWRAM << 4)): \ dma_transfer_loop_region(bios, iwram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IWRAM | (DMA_REGION_IWRAM << 4)): \ dma_transfer_loop_region(iwram, iwram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EWRAM | (DMA_REGION_IWRAM << 4)): \ dma_transfer_loop_region(ewram, iwram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_VRAM | (DMA_REGION_IWRAM << 4)): \ dma_transfer_loop_region(vram, iwram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_PALETTE_RAM | (DMA_REGION_IWRAM << 4)): \ dma_transfer_loop_region(palette_ram, iwram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_OAM_RAM | (DMA_REGION_IWRAM << 4)): \ dma_transfer_loop_region(oam_ram, iwram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IO | (DMA_REGION_IWRAM << 4)): \ dma_transfer_loop_region(io, iwram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_GAMEPAK | (DMA_REGION_IWRAM << 4)): \ dma_transfer_loop_region(gamepak, iwram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EXT | (DMA_REGION_IWRAM << 4)): \ dma_transfer_loop_region(ext, iwram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_BIOS | (DMA_REGION_EWRAM << 4)): \ dma_transfer_loop_region(bios, ewram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IWRAM | (DMA_REGION_EWRAM << 4)): \ dma_transfer_loop_region(iwram, ewram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EWRAM | (DMA_REGION_EWRAM << 4)): \ dma_transfer_loop_region(ewram, ewram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_VRAM | (DMA_REGION_EWRAM << 4)): \ dma_transfer_loop_region(vram, ewram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_PALETTE_RAM | (DMA_REGION_EWRAM << 4)): \ dma_transfer_loop_region(palette_ram, ewram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_OAM_RAM | (DMA_REGION_EWRAM << 4)): \ dma_transfer_loop_region(oam_ram, ewram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IO | (DMA_REGION_EWRAM << 4)): \ dma_transfer_loop_region(io, ewram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_GAMEPAK | (DMA_REGION_EWRAM << 4)): \ dma_transfer_loop_region(gamepak, ewram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EXT | (DMA_REGION_EWRAM << 4)): \ dma_transfer_loop_region(ext, ewram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_BIOS | (DMA_REGION_VRAM << 4)): \ dma_transfer_loop_region(bios, vram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IWRAM | (DMA_REGION_VRAM << 4)): \ dma_transfer_loop_region(iwram, vram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EWRAM | (DMA_REGION_VRAM << 4)): \ dma_transfer_loop_region(ewram, vram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_VRAM | (DMA_REGION_VRAM << 4)): \ dma_transfer_loop_region(vram, vram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_PALETTE_RAM | (DMA_REGION_VRAM << 4)): \ dma_transfer_loop_region(palette_ram, vram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_OAM_RAM | (DMA_REGION_VRAM << 4)): \ dma_transfer_loop_region(oam_ram, vram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IO | (DMA_REGION_VRAM << 4)): \ dma_transfer_loop_region(io, vram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_GAMEPAK | (DMA_REGION_VRAM << 4)): \ dma_transfer_loop_region(gamepak, vram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EXT | (DMA_REGION_VRAM << 4)): \ dma_transfer_loop_region(ext, vram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_BIOS | (DMA_REGION_PALETTE_RAM << 4)): \ dma_transfer_loop_region(bios, palette_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IWRAM | (DMA_REGION_PALETTE_RAM << 4)): \ dma_transfer_loop_region(iwram, palette_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EWRAM | (DMA_REGION_PALETTE_RAM << 4)): \ dma_transfer_loop_region(ewram, palette_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_VRAM | (DMA_REGION_PALETTE_RAM << 4)): \ dma_transfer_loop_region(vram, palette_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_PALETTE_RAM | (DMA_REGION_PALETTE_RAM << 4)): \ dma_transfer_loop_region(palette_ram, palette_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_OAM_RAM | (DMA_REGION_PALETTE_RAM << 4)): \ dma_transfer_loop_region(oam_ram, palette_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IO | (DMA_REGION_PALETTE_RAM << 4)): \ dma_transfer_loop_region(io, palette_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_GAMEPAK | (DMA_REGION_PALETTE_RAM << 4)): \ dma_transfer_loop_region(gamepak, palette_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EXT | (DMA_REGION_PALETTE_RAM << 4)): \ dma_transfer_loop_region(ext, palette_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_BIOS | (DMA_REGION_OAM_RAM << 4)): \ dma_transfer_loop_region(bios, oam_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IWRAM | (DMA_REGION_OAM_RAM << 4)): \ dma_transfer_loop_region(iwram, oam_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EWRAM | (DMA_REGION_OAM_RAM << 4)): \ dma_transfer_loop_region(ewram, oam_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_VRAM | (DMA_REGION_OAM_RAM << 4)): \ dma_transfer_loop_region(vram, oam_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_PALETTE_RAM | (DMA_REGION_OAM_RAM << 4)): \ dma_transfer_loop_region(palette_ram, oam_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_OAM_RAM | (DMA_REGION_OAM_RAM << 4)): \ dma_transfer_loop_region(oam_ram, oam_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IO | (DMA_REGION_OAM_RAM << 4)): \ dma_transfer_loop_region(io, oam_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_GAMEPAK | (DMA_REGION_OAM_RAM << 4)): \ dma_transfer_loop_region(gamepak, oam_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EXT | (DMA_REGION_OAM_RAM << 4)): \ dma_transfer_loop_region(ext, oam_ram, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_BIOS | (DMA_REGION_IO << 4)): \ dma_transfer_loop_region(bios, io, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IWRAM | (DMA_REGION_IO << 4)): \ dma_transfer_loop_region(iwram, io, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EWRAM | (DMA_REGION_IO << 4)): \ dma_transfer_loop_region(ewram, io, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_VRAM | (DMA_REGION_IO << 4)): \ dma_transfer_loop_region(vram, io, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_PALETTE_RAM | (DMA_REGION_IO << 4)): \ dma_transfer_loop_region(palette_ram, io, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_OAM_RAM | (DMA_REGION_IO << 4)): \ dma_transfer_loop_region(oam_ram, io, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IO | (DMA_REGION_IO << 4)): \ dma_transfer_loop_region(io, io, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_GAMEPAK | (DMA_REGION_IO << 4)): \ dma_transfer_loop_region(gamepak, io, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EXT | (DMA_REGION_IO << 4)): \ dma_transfer_loop_region(ext, io, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_BIOS | (DMA_REGION_EXT << 4)): \ dma_transfer_loop_region(bios, ext, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IWRAM | (DMA_REGION_EXT << 4)): \ dma_transfer_loop_region(iwram, ext, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EWRAM | (DMA_REGION_EXT << 4)): \ dma_transfer_loop_region(ewram, ext, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_VRAM | (DMA_REGION_EXT << 4)): \ dma_transfer_loop_region(vram, ext, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_PALETTE_RAM | (DMA_REGION_EXT << 4)): \ dma_transfer_loop_region(palette_ram, ext, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_OAM_RAM | (DMA_REGION_EXT << 4)): \ dma_transfer_loop_region(oam_ram, ext, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_IO | (DMA_REGION_EXT << 4)): \ dma_transfer_loop_region(io, ext, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_GAMEPAK | (DMA_REGION_EXT << 4)): \ dma_transfer_loop_region(gamepak, ext, src_strd, dest_strd, \ transfer_size, wb); \ \ case (DMA_REGION_EXT | (DMA_REGION_EXT << 3)): \ dma_transfer_loop_region(ext, ext, src_strd, dest_strd, \ transfer_size, wb); \ } \ return return_value; \ } \ dma_tf_loop_builder(16); dma_tf_loop_builder(32); static const int dma_stride[4] = {1, -1, 0, 1}; static cpu_alert_type dma_transfer_copy( dma_transfer_type *dmach, u32 src_ptr, u32 dest_ptr, u32 length) { if (dmach->source_direction < 3) { int dst_stride = dma_stride[dmach->dest_direction]; int src_stride = dma_stride[dmach->source_direction]; bool dst_wb = dmach->dest_direction < 3; if(dmach->length_type == DMA_16BIT) { return dma_tf_loop16(src_ptr, dest_ptr, 2 * src_stride, 2 * dst_stride, dst_wb, length, dmach); } else { return dma_tf_loop32(src_ptr, dest_ptr, 4 * src_stride, 4 * dst_stride, dst_wb, length, dmach); } } return CPU_ALERT_NONE; } cpu_alert_type dma_transfer(unsigned dma_chan) { dma_transfer_type *dmach = &dma[dma_chan]; u32 src_ptr = dmach->source_address & ( dmach->length_type == DMA_16BIT ? ~1U : ~3U); u32 dst_ptr = dmach->dest_address & ( dmach->length_type == DMA_16BIT ? ~1U : ~3U); cpu_alert_type ret = CPU_ALERT_NONE; u32 tfsizes = dmach->length_type == DMA_16BIT ? 1 : 2; u32 byte_length = dmach->length << tfsizes; // Divide the DMA transaction into up to three transactions depending on // the source and destination memory regions. u32 src_end = MIN(0x10000000, src_ptr + byte_length * dma_stride[dmach->source_direction]); u32 dst_end = MIN(0x10000000, dst_ptr + byte_length * dma_stride[dmach->dest_direction]); dma_region_type src_reg0 = dma_region_map[src_ptr >> 24]; dma_region_type src_reg1 = dma_region_map[src_end >> 24]; dma_region_type dst_reg0 = dma_region_map[dst_ptr >> 24]; dma_region_type dst_reg1 = dma_region_map[dst_end >> 24]; if (src_reg0 == src_reg1 && dst_reg0 == dst_reg1) ret = dma_transfer_copy(dmach, src_ptr, dst_ptr, byte_length >> tfsizes); else if (src_reg0 == src_reg1) { // Source stays within the region, dest crosses over u32 blen0 = dma_stride[dmach->dest_direction] < 0 ? dst_ptr & 0xFFFFFF : 0x1000000 - (dst_ptr & 0xFFFFFF); u32 src1 = src_ptr + blen0 * dma_stride[dmach->source_direction]; u32 dst1 = dst_ptr + blen0 * dma_stride[dmach->dest_direction]; ret = dma_transfer_copy(dmach, src_ptr, dst_ptr, blen0 >> tfsizes); ret = dma_transfer_copy(dmach, src1, dst1, (byte_length - blen0) >> tfsizes); } else if (dst_reg0 == dst_reg1) { // Dest stays within the region, source crosses over u32 blen0 = dma_stride[dmach->source_direction] < 0 ? src_ptr & 0xFFFFFF : 0x1000000 - (src_ptr & 0xFFFFFF); u32 src1 = src_ptr + blen0 * dma_stride[dmach->source_direction]; u32 dst1 = dst_ptr + blen0 * dma_stride[dmach->dest_direction]; ret = dma_transfer_copy(dmach, src_ptr, dst_ptr, blen0 >> tfsizes); ret = dma_transfer_copy(dmach, src1, dst1, (byte_length - blen0) >> tfsizes); } // TODO: We do not cover the three-region case, seems no game uses that? // Lucky Luke does cross dest region due to some off-by-one error. if((dmach->repeat_type == DMA_NO_REPEAT) || (dmach->start_type == DMA_START_IMMEDIATELY)) { u32 cntrl = read_dmareg(REG_DMA0CNT_H, dma_chan); write_dmareg(REG_DMA0CNT_H, dma_chan, cntrl & (~0x8000)); dmach->start_type = DMA_INACTIVE; } if(dmach->irq) { raise_interrupt(IRQ_DMA0 << dma_chan); ret = CPU_ALERT_IRQ; } return ret; } // Be sure to do this after loading ROMs. #define map_rom_entry(type, idx, ptr, mirror_blocks) { \ unsigned mcount; \ for(mcount = 0; mcount < 1024; mcount += (mirror_blocks)) { \ memory_map_##type[(0x8000000 / (32 * 1024)) + (idx) + mcount] = (ptr); \ memory_map_##type[(0xA000000 / (32 * 1024)) + (idx) + mcount] = (ptr); \ } \ for(mcount = 0; mcount < 512; mcount += (mirror_blocks)) { \ memory_map_##type[(0xC000000 / (32 * 1024)) + (idx) + mcount] = (ptr); \ } \ } #define map_region(type, start, end, mirror_blocks, region) \ for(map_offset = (start) / 0x8000; map_offset < \ ((end) / 0x8000); map_offset++) \ { \ memory_map_##type[map_offset] = \ ((u8 *)region) + ((map_offset % mirror_blocks) * 0x8000); \ } \ #define map_null(type, start, end) { \ u32 map_offset; \ for(map_offset = start / 0x8000; map_offset < (end / 0x8000); \ map_offset++) \ memory_map_##type[map_offset] = NULL; \ } #define map_vram(type) \ for(map_offset = 0x6000000 / 0x8000; map_offset < (0x7000000 / 0x8000); \ map_offset += 4) \ { \ memory_map_##type[map_offset] = vram; \ memory_map_##type[map_offset + 1] = vram + 0x8000; \ memory_map_##type[map_offset + 2] = vram + (0x8000 * 2); \ memory_map_##type[map_offset + 3] = vram + (0x8000 * 2); \ } \ static u32 evict_gamepak_page(void) { u32 ret; s16 phyrom; do { // Return the index to the last used entry u32 newhead = gamepak_blk_queue[gamepak_lru_head].next_lru; phyrom = gamepak_blk_queue[gamepak_lru_head].phy_rom; ret = gamepak_lru_head; // Second elem becomes head now gamepak_lru_head = newhead; // The evicted element goes at the end of the queue gamepak_blk_queue[gamepak_lru_tail].next_lru = ret; gamepak_lru_tail = ret; // If this page is marked as sticky, we keep going through the list } while (phyrom >= 0 && gamepak_sb_test(phyrom)); // We unmap the ROM page if it was mapped, ensure we do not access it // without triggering a "page fault" if (phyrom >= 0) { map_rom_entry(read, phyrom, NULL, gamepak_size >> 15); } return ret; } u8 *load_gamepak_page(u32 physical_index) { if(physical_index >= (gamepak_size >> 15)) return &gamepak_buffers[0][0]; u32 entry = evict_gamepak_page(); u32 block_idx = entry / 32; u32 block_off = entry % 32; u8 *swap_location = &gamepak_buffers[block_idx][32 * 1024 * block_off]; // Fill in the entry gamepak_blk_queue[entry].phy_rom = physical_index; fseek(gamepak_file_large, physical_index * (32 * 1024), SEEK_SET); fread(swap_location, 1, (32 * 1024), gamepak_file_large); // Map it to the read handlers now map_rom_entry(read, physical_index, swap_location, gamepak_size >> 15); // If RTC is active page the RTC register bytes so they can be read if ((rtc_state != RTC_DISABLED) && (physical_index == 0)) { address16(swap_location, 0xC4) = eswap16(rtc_registers[0]); address16(swap_location, 0xC6) = eswap16(rtc_registers[1]); address16(swap_location, 0xC8) = eswap16(rtc_registers[2]); } return swap_location; } void init_gamepak_buffer(void) { unsigned i; // Try to allocate up to 32 blocks of 1MB each gamepak_buffer_count = 0; while (gamepak_buffer_count < ROM_BUFFER_SIZE) { void *ptr = malloc(1024*1024); if (!ptr) break; gamepak_buffers[gamepak_buffer_count++] = (u8*)ptr; } // Initialize the memory map structure for (i = 0; i < 1024; i++) { gamepak_blk_queue[i].next_lru = (u16)(i + 1); gamepak_blk_queue[i].phy_rom = -1; } gamepak_lru_head = 0; gamepak_lru_tail = 32 * gamepak_buffer_count - 1; } void init_memory(void) { u32 map_offset = 0; // Fill memory map regions, areas marked as NULL must be checked directly map_region(read, 0x0000000, 0x1000000, 1, bios_rom); map_null(read, 0x1000000, 0x2000000); map_region(read, 0x2000000, 0x3000000, 8, ewram); map_region(read, 0x3000000, 0x4000000, 1, &iwram[0x8000]); map_region(read, 0x4000000, 0x5000000, 1, io_registers); map_null(read, 0x5000000, 0x6000000); map_null(read, 0x6000000, 0x7000000); map_vram(read); map_null(read, 0x7000000, 0x8000000); map_null(read, 0xE000000, 0x10000000); memset(io_registers, 0, sizeof(io_registers)); memset(oam_ram, 0, sizeof(oam_ram)); memset(palette_ram, 0, sizeof(palette_ram)); memset(iwram, 0, sizeof(iwram)); memset(ewram, 0, sizeof(ewram)); memset(vram, 0, sizeof(vram)); write_ioreg(REG_DISPCNT, 0x80); write_ioreg(REG_P1, 0x3FF); write_ioreg(REG_BG2PA, 0x100); write_ioreg(REG_BG2PD, 0x100); write_ioreg(REG_BG3PA, 0x100); write_ioreg(REG_BG3PD, 0x100); write_ioreg(REG_RCNT, 0x8000); backup_type = BACKUP_NONE; sram_size = SRAM_SIZE_32KB; //flash_size = FLASH_SIZE_64KB; flash_bank_num = 0; flash_command_position = 0; eeprom_size = EEPROM_512_BYTE; eeprom_mode = EEPROM_BASE_MODE; eeprom_address = 0; eeprom_counter = 0; flash_mode = FLASH_BASE_MODE; rtc_state = RTC_DISABLED; memset(rtc_registers, 0, sizeof(rtc_registers)); bios_read_protect = 0xe129f000; } void memory_term(void) { if (gamepak_file_large) { fclose(gamepak_file_large); gamepak_file_large = NULL; } while (gamepak_buffer_count) { free(gamepak_buffers[--gamepak_buffer_count]); } } bool memory_read_savestate(const u8 *src) { int i; const u8 *memdoc = bson_find_key(src, "memory"); const u8 *bakdoc = bson_find_key(src, "backup"); const u8 *dmadoc = bson_find_key(src, "dma"); if (!memdoc || !bakdoc || !dmadoc) return false; if (!( bson_read_bytes(memdoc, "iwram", &iwram[0x8000], 0x8000) && bson_read_bytes(memdoc, "ewram", ewram, 0x40000) && bson_read_bytes(memdoc, "vram", vram, sizeof(vram)) && bson_read_bytes(memdoc, "oamram", oam_ram, sizeof(oam_ram)) && bson_read_bytes(memdoc, "palram", palette_ram, sizeof(palette_ram)) && bson_read_bytes(memdoc, "ioregs", io_registers, sizeof(io_registers)) && bson_read_int32(bakdoc, "backup-type", &backup_type) && bson_read_int32(bakdoc, "sram-size", &sram_size) && bson_read_int32(bakdoc, "flash-mode", &flash_mode) && bson_read_int32(bakdoc, "flash-cmd-pos", &flash_command_position) && bson_read_int32(bakdoc, "flash-bank-num", &flash_bank_num) && bson_read_int32(bakdoc, "flash-dev-id", &flash_device_id) && bson_read_int32(bakdoc, "flash-man-id", &flash_manufacturer_id) && bson_read_int32(bakdoc, "flash-size", &flash_size) && bson_read_int32(bakdoc, "eeprom-size", &eeprom_size) && bson_read_int32(bakdoc, "eeprom-mode", &eeprom_mode) && bson_read_int32(bakdoc, "eeprom-addr", &eeprom_address) && bson_read_int32(bakdoc, "eeprom-counter", &eeprom_counter) && bson_read_int32(bakdoc, "rtc-state", &rtc_state) && bson_read_int32(bakdoc, "rtc-write-mode", &rtc_write_mode) && bson_read_int32(bakdoc, "rtc-cmd", &rtc_command) && bson_read_int32(bakdoc, "rtc-status", &rtc_status) && bson_read_int32(bakdoc, "rtc-data-byte-cnt", &rtc_data_bytes) && bson_read_int32(bakdoc, "rtc-bit-cnt", (u32*)&rtc_bit_count) && bson_read_bytes(bakdoc, "rtc-regs", rtc_registers, sizeof(rtc_registers)) && bson_read_int32_array(bakdoc, "rtc-data-words", rtc_data, sizeof(rtc_data)/sizeof(rtc_data[0])))) return false; for (i = 0; i < DMA_CHAN_CNT; i++) { char tname[2] = {'0' + i, 0}; const u8 *dmastr = bson_find_key(dmadoc, tname); if (!( bson_read_int32(dmastr, "src-addr", &dma[i].source_address) && bson_read_int32(dmastr, "dst-addr", &dma[i].dest_address) && bson_read_int32(dmastr, "src-dir", &dma[i].source_direction) && bson_read_int32(dmastr, "dst-dir", &dma[i].dest_direction) && bson_read_int32(dmastr, "len", &dma[i].length) && bson_read_int32(dmastr, "size", &dma[i].length_type) && bson_read_int32(dmastr, "repeat", &dma[i].repeat_type) && bson_read_int32(dmastr, "start", &dma[i].start_type) && bson_read_int32(dmastr, "dsc", &dma[i].direct_sound_channel) && bson_read_int32(dmastr, "irq", &dma[i].irq))) return false; } return true; } unsigned memory_write_savestate(u8 *dst) { int i; u8 *wbptr, *wbptr2, *startp = dst; bson_start_document(dst, "memory", wbptr); bson_write_bytes(dst, "iwram", &iwram[0x8000], 0x8000); bson_write_bytes(dst, "ewram", ewram, 0x40000); bson_write_bytes(dst, "vram", vram, sizeof(vram)); bson_write_bytes(dst, "oamram", oam_ram, sizeof(oam_ram)); bson_write_bytes(dst, "palram", palette_ram, sizeof(palette_ram)); bson_write_bytes(dst, "ioregs", io_registers, sizeof(io_registers)); bson_finish_document(dst, wbptr); bson_start_document(dst, "backup", wbptr); bson_write_int32(dst, "backup-type", backup_type); bson_write_int32(dst, "sram-size", sram_size); bson_write_int32(dst, "flash-mode", flash_mode); bson_write_int32(dst, "flash-cmd-pos", flash_command_position); bson_write_int32(dst, "flash-bank-num", flash_bank_num); bson_write_int32(dst, "flash-dev-id", flash_device_id); bson_write_int32(dst, "flash-man-id", flash_manufacturer_id); bson_write_int32(dst, "flash-size", flash_size); bson_write_int32(dst, "eeprom-size", eeprom_size); bson_write_int32(dst, "eeprom-mode", eeprom_mode); bson_write_int32(dst, "eeprom-addr", eeprom_address); bson_write_int32(dst, "eeprom-counter", eeprom_counter); bson_write_int32(dst, "rtc-state", rtc_state); bson_write_int32(dst, "rtc-write-mode", rtc_write_mode); bson_write_int32(dst, "rtc-cmd", rtc_command); bson_write_int32(dst, "rtc-status", rtc_status); bson_write_int32(dst, "rtc-data-byte-cnt", rtc_data_bytes); bson_write_int32(dst, "rtc-bit-cnt", rtc_bit_count); bson_write_bytes(dst, "rtc-regs", rtc_registers, sizeof(rtc_registers)); bson_write_int32array(dst, "rtc-data-words", rtc_data, sizeof(rtc_data)/sizeof(rtc_data[0])); bson_finish_document(dst, wbptr); bson_start_document(dst, "dma", wbptr); for (i = 0; i < DMA_CHAN_CNT; i++) { char tname[2] = {'0' + i, 0}; bson_start_document(dst, tname, wbptr2); bson_write_int32(dst, "src-addr", dma[i].source_address); bson_write_int32(dst, "dst-addr", dma[i].dest_address); bson_write_int32(dst, "src-dir", dma[i].source_direction); bson_write_int32(dst, "dst-dir", dma[i].dest_direction); bson_write_int32(dst, "len", dma[i].length); bson_write_int32(dst, "size", dma[i].length_type); bson_write_int32(dst, "repeat", dma[i].repeat_type); bson_write_int32(dst, "start", dma[i].start_type); bson_write_int32(dst, "dsc", dma[i].direct_sound_channel); bson_write_int32(dst, "irq", dma[i].irq); bson_finish_document(dst, wbptr2); } bson_finish_document(dst, wbptr); return (unsigned int)(dst - startp); } static s32 load_gamepak_raw(const char *name) { unsigned i, j; gamepak_file_large = fopen(name, "rb"); if(gamepak_file_large) { // Round size to 32KB pages gamepak_size = file_length(gamepak_file_large); gamepak_size = (gamepak_size + 0x7FFF) & ~0x7FFF; // Load stuff in 1MB chunks u32 buf_blocks = (gamepak_size + 1024*1024-1) / (1024*1024); u32 rom_blocks = gamepak_size >> 15; u32 ldblks = buf_blocks < gamepak_buffer_count ? buf_blocks : gamepak_buffer_count; // Unmap the ROM space since we will re-map it now map_null(read, 0x8000000, 0xD000000); // Proceed to read the whole ROM or as much as possible. for (i = 0; i < ldblks; i++) { // Load 1MB chunk and map it fread(gamepak_buffers[i], 1, 1024*1024, gamepak_file_large); for (j = 0; j < 32 && i*32 + j < rom_blocks; j++) { u32 phyn = i*32 + j; u8* blkptr = &gamepak_buffers[i][32 * 1024 * j]; u32 entry = evict_gamepak_page(); gamepak_blk_queue[entry].phy_rom = phyn; // Map it to the read handlers now map_rom_entry(read, phyn, blkptr, rom_blocks); } } return 0; } return -1; } u32 load_gamepak(const struct retro_game_info* info, const char *name) { char *p; char gamepak_filename[512]; gamepak_info_t gpinfo; if (load_gamepak_raw(name)) return -1; strncpy(gamepak_filename, name, sizeof(gamepak_filename)); gamepak_filename[sizeof(gamepak_filename) - 1] = 0; p = strrchr(gamepak_filename, PATH_SEPARATOR_CHAR); if (p) p++; else p = gamepak_filename; snprintf(backup_filename, sizeof(backup_filename), "%s%c%s", save_path, PATH_SEPARATOR_CHAR, p); p = strrchr(backup_filename, '.'); if (p) strcpy(p, ".sav"); if (!use_libretro_save_method) load_backup(backup_filename); // Buffer 0 always has the first 1MB chunk of the ROM memset(&gpinfo, 0, sizeof(gpinfo)); memcpy(gpinfo.gamepak_title, &gamepak_buffers[0][0xA0], 12); memcpy(gpinfo.gamepak_code, &gamepak_buffers[0][0xAC], 4); memcpy(gpinfo.gamepak_maker, &gamepak_buffers[0][0xB0], 2); idle_loop_target_pc = 0xFFFFFFFF; iwram_stack_optimize = 1; translation_gate_targets = 0; flash_device_id = FLASH_DEVICE_MACRONIX_64KB; flash_size = FLASH_SIZE_64KB; if ((load_game_config_over(&gpinfo)) < 0) load_game_config(&gpinfo); return 0; } s32 load_bios(char *name) { FILE *fd = fopen(name, "rb"); if(!fd) return -1; fread(bios_rom, 1, 0x4000, fd); fclose(fd); return 0; }