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gpsp/gba_memory.c

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/* gameplaySP
*
* Copyright (C) 2006 Exophase <exophase@gmail.com>
*
* 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"
#include "streams/file_stream.h"
/* Sound */
#define gbc_sound_tone_control_low(channel, regn) \
{ \
render_gbc_sound(); \
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; \
write_ioreg(regn, value); \
} \
#define gbc_sound_tone_control_high(channel, regn) \
{ \
render_gbc_sound(); \
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; \
} \
\
write_ioreg(regn, value & 0x47FF); \
} \
#define gbc_sound_tone_control_sweep() \
{ \
render_gbc_sound(); \
value &= 0x007F; \
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; \
write_ioreg(REG_SOUND1CNT_L, value); \
} \
#define gbc_sound_wave_control() \
{ \
render_gbc_sound(); \
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; \
\
write_ioreg(REG_SOUND3CNT_L, value & 0x00E0); \
} \
static const u32 gbc_sound_wave_volume[4] = { 0, 16384, 8192, 4096 };
#define gbc_sound_tone_control_low_wave() \
{ \
render_gbc_sound(); \
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]; \
write_ioreg(REG_SOUND3CNT_H, value); \
} \
#define gbc_sound_tone_control_high_wave() \
{ \
render_gbc_sound(); \
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; \
} \
write_ioreg(REG_SOUND3CNT_X, value); \
} \
#define gbc_sound_noise_control() \
{ \
u32 dividing_ratio = value & 0x07; \
u32 frequency_shift = (value >> 4) & 0x0F; \
render_gbc_sound(); \
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; \
} \
write_ioreg(REG_SOUND4CNT_H, value & 0x40FF); \
} \
static void gbc_trigger_sound(u32 value)
{
u32 channel;
render_gbc_sound();
/* 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 =
(((value >> (channel + 8)) & 0x1) | ((value >> (channel + 11)) & 0x3));
}
write_ioreg(REG_SOUNDCNT_L, value & 0xFF77);
}
#define trigger_sound() \
{ \
render_gbc_sound(); \
timer[0].direct_sound_channels = \
((((value >> 10) & 0x01) == 0) | ((((value >> 14) & 0x01) == 0) << 1)); \
timer[1].direct_sound_channels = \
((((value >> 10) & 0x01) == 1) | ((((value >> 14) & 0x01) == 1) << 1)); \
direct_sound_channel[0].volume_halve = ((~(value >> 2)) & 0x01); \
direct_sound_channel[0].status = ((value >> 8) & 0x03); \
direct_sound_channel[1].volume_halve = ((~(value >> 3)) & 0x01); \
direct_sound_channel[1].status = ((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 & 0x770F); \
} \
static void sound_control_x(u32 value)
{
render_gbc_sound();
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 = ((value >> 6) & 0x1);
write_ioreg(REG_TMXD(timer_number), (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_TMXCNT(timer_number), value);
}
/* Memory timings */
const u8 ws012_nonseq[] = {4, 3, 2, 8};
const u8 ws0_seq[] = {2, 1};
const u8 ws1_seq[] = {4, 1};
const u8 ws2_seq[] = {8, 1};
/* Divided by region and bus width (16/32) */
u8 ws_cyc_seq[16][2] =
{
{ 1, 1 }, // BIOS
{ 1, 1 }, // Invalid
{ 3, 6 }, // EWRAM (default settings)
{ 1, 1 }, // IWRAM
{ 1, 1 }, // IO Registers
{ 1, 2 }, // Palette RAM
{ 1, 2 }, // VRAM
{ 1, 2 }, // OAM
{ 0, 0 }, // Gamepak (wait 0)
{ 0, 0 }, // Gamepak (wait 0)
{ 0, 0 }, // Gamepak (wait 1)
{ 0, 0 }, // Gamepak (wait 1)
{ 0, 0 }, // Gamepak (wait 2)
{ 0, 0 }, // Gamepak (wait 2)
{ 1, 1 }, // Invalid
{ 1, 1 }, // Invalid
};
u8 ws_cyc_nseq[16][2] =
{
{ 1, 1 }, // BIOS
{ 1, 1 }, // Invalid
{ 3, 6 }, // EWRAM (default settings)
{ 1, 1 }, // IWRAM
{ 1, 1 }, // IO Registers
{ 1, 2 }, // Palette RAM
{ 1, 2 }, // VRAM
{ 1, 2 }, // OAM
{ 0, 0 }, // Gamepak (wait 0)
{ 0, 0 }, // Gamepak (wait 0)
{ 0, 0 }, // Gamepak (wait 1)
{ 0, 0 }, // Gamepak (wait 1)
{ 0, 0 }, // Gamepak (wait 2)
{ 0, 0 }, // Gamepak (wait 2)
{ 1, 1 }, // Invalid
{ 1, 1 }, // Invalid
};
const u32 def_seq_cycles[16][2] =
{
{ 1, 1 }, // BIOS
{ 1, 1 }, // Invalid
{ 3, 6 }, // EWRAM (default settings)
{ 1, 1 }, // IWRAM
{ 1, 1 }, // IO Registers
{ 1, 2 }, // Palette RAM
{ 1, 2 }, // VRAM
{ 1, 2 }, // OAM
{ 3, 6 }, // Gamepak (wait 0)
{ 3, 6 }, // Gamepak (wait 0)
{ 5, 9 }, // Gamepak (wait 1)
{ 5, 9 }, // Gamepak (wait 1)
{ 9, 17 }, // Gamepak (wait 2)
{ 9, 17 }, // Gamepak (wait 2)
};
u8 bios_rom[1024 * 16];
// Up to 128kb, store SRAM, flash ROM, or EEPROM here.
u8 gamepak_backup[1024 * 128];
u32 dma_bus_val;
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 */
// We allocate in 1MB chunks.
const unsigned gamepak_buffer_blocksize = 1024*1024;
// 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.
RFILE *gamepak_file_large = NULL;
// Writes to these respective locations should trigger an update
// so the related subsystem may react to it.
// If the GBC audio waveform is modified:
u32 gbc_sound_wave_update = 0;
u32 backup_type = BACKUP_UNKN;
u32 backup_type_reset = BACKUP_UNKN;
u32 flash_mode = FLASH_BASE_MODE;
u32 flash_command_position = 0;
u32 flash_bank_num; // 0 or 1
u32 flash_bank_cnt;
u32 flash_device_id = FLASH_DEVICE_MACRONIX_64KB;
void reload_timing_info()
{
int i;
uint16_t waitcnt = read_ioreg(REG_WAITCNT);
/* Sequential 16 and 32 bit accesses to ROM */
ws_cyc_seq[0x8][0] = ws_cyc_seq[0x9][0] = 1 + ws0_seq[(waitcnt >> 4) & 1];
ws_cyc_seq[0xA][0] = ws_cyc_seq[0xB][0] = 1 + ws1_seq[(waitcnt >> 7) & 1];
ws_cyc_seq[0xC][0] = ws_cyc_seq[0xD][0] = 1 + ws2_seq[(waitcnt >> 10) & 1];
for (i = 0x8; i <= 0xD; i++)
{
/* 32 bit accesses just cost double due to 16 bit bus */
ws_cyc_seq[i][1] = ws_cyc_seq[i][0] * 2;
}
/* Sequential 16 and 32 bit accesses to ROM */
ws_cyc_nseq[0x8][0] = ws_cyc_nseq[0x9][0] = 1 + ws012_nonseq[(waitcnt >> 2) & 3];
ws_cyc_nseq[0xA][0] = ws_cyc_nseq[0xB][0] = 1 + ws012_nonseq[(waitcnt >> 5) & 3];
ws_cyc_nseq[0xC][0] = ws_cyc_nseq[0xD][0] = 1 + ws012_nonseq[(waitcnt >> 8) & 3];
for (i = 0x8; i <= 0xD; i++)
{
/* 32 bit accesses are a non-seq (16) + seq access (16) */
ws_cyc_nseq[i][1] = 1 + ws_cyc_nseq[i][0] + ws_cyc_seq[i][0];
}
}
u8 read_backup(u32 address)
{
u8 value = 0;
if(backup_type == BACKUP_EEPROM)
return 0xff;
if(backup_type == BACKUP_UNKN)
backup_type = BACKUP_SRAM;
if(backup_type == BACKUP_SRAM)
value = gamepak_backup[address];
else if(flash_mode == FLASH_ID_MODE)
{
if (flash_bank_cnt == 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 = read_backup(address & 0xFFFF); \
value = value | (value << 8);
#define read_backup32() \
value = read_backup(address & 0xFFFF); \
value = value | (value << 8); \
value = value | (value << 16);
#define write_eeprom8(addr, value)
#define write_eeprom16(addr, value) \
write_eeprom(addr, value)
#define write_eeprom32(addr, value)
// EEPROM is 512 bytes by default; it is autodetecte as 8KB if
// 14bit address DMAs are made (this is done in the DMA handler).
u32 eeprom_size = EEPROM_512_BYTE;
u32 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 unmapped_rom_read8(addr) \
(((addr) >> 1) >> (((addr) & 1) * 8)) & 0xFF
#define unmapped_rom_read16(addr) \
((addr) >> 1) & 0xFFFF
#define unmapped_rom_read32(addr) \
((((addr) & ~3) >> 1) & 0xFFFF) | (((((addr) & ~3) + 2) >> 1) << 16)
#define read_open8() \
if(!(reg[REG_CPSR] & 0x20)) \
value = read_memory8(reg[REG_PC] + 8 + (address & 0x03)); \
else \
value = read_memory8(reg[REG_PC] + 4 + (address & 0x01)) \
#define read_open16() \
if(!(reg[REG_CPSR] & 0x20)) \
value = read_memory16(reg[REG_PC] + 8 + (address & 0x02)); \
else \
value = read_memory16(reg[REG_PC] + 4) \
#define read_open32() \
if(!(reg[REG_CPSR] & 0x20)) \
value = read_memory32(reg[REG_PC] + 8); \
else \
{ \
u32 current_instruction = read_memory16(reg[REG_PC] + 4); \
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 (address < 0x4000) { \
if(reg[REG_PC] >= 0x4000) \
value = (u##type)(reg[REG_BUS_VALUE] >> ((address & 0x03) << 3)); \
else \
value = readaddress##type(bios_rom, address & 0x3FFF); \
} else { \
read_open##type(); \
} \
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 0x0D: \
if (backup_type == BACKUP_EEPROM) { \
value = read_eeprom(); \
break; \
} \
/* fallthrough */ \
case 0x08: \
case 0x09: \
case 0x0A: \
case 0x0B: \
case 0x0C: \
/* gamepak ROM */ \
if((address & 0x1FFFFFF) >= gamepak_size) \
value = unmapped_rom_read##type(address); \
else \
{ \
read_memory_gamepak(type); \
} \
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)
{
u32 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 = ((value >> 7) & 3);
dma[dma_number].repeat_type = ((value >> 9) & 0x01);
dma[dma_number].start_type = start_type;
dma[dma_number].irq = ((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 = ((value >> 10) & 0x01);
dma[dma_number].dest_direction = ((value >> 5) & 3);
}
write_dmareg(REG_DMA0CNT_H, dma_number, value);
if(start_type == DMA_START_IMMEDIATELY) {
// Excutes the DMA now! Copies the data and returns side effects.
int dma_cycles = 0;
cpu_alert_type ret = dma_transfer(dma_number, &dma_cycles);
if (!dma_cycles)
return ret;
// Sleep CPU for N cycles and return HALT as side effect (so it does).
reg[CPU_HALT_STATE] = CPU_DMA;
reg[REG_SLEEP_CYCLES] = 0x80000000 | (u32)dma_cycles;
return CPU_ALERT_HALT | ret;
}
}
}
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;
}
static inline s32 signext28(u32 value)
{
s32 ret = (s32)(value << 4);
return ret >> 4;
}
cpu_alert_type function_cc write_io_register16(u32 address, u32 value)
{
uint16_t ioreg = (address & 0x3FE) >> 1;
value &= 0xffff;
switch(ioreg)
{
case REG_DISPCNT:
// Changing the lowest 3 bits might require object re-sorting
reg[OAM_UPDATED] |= ((value & 0x07) != (read_ioreg(REG_DISPCNT) & 0x07));
write_ioreg(REG_DISPCNT, value);
break;
// DISPSTAT has 3 read only bits, controlled by the LCD controller
case REG_DISPSTAT:
write_ioreg(REG_DISPSTAT, (read_ioreg(REG_DISPSTAT) & 0x07) | (value & ~0x07));
break;
// BG2 reference X
case REG_BG2X_L:
case REG_BG2X_H:
write_ioreg(ioreg, value);
affine_reference_x[0] = signext28(read_ioreg32(REG_BG2X_L));
break;
// BG2 reference Y
case REG_BG2Y_L:
case REG_BG2Y_H:
write_ioreg(ioreg, value);
affine_reference_y[0] = signext28(read_ioreg32(REG_BG2Y_L));
break;
// BG3 reference X
case REG_BG3X_L:
case REG_BG3X_H:
write_ioreg(ioreg, value);
affine_reference_x[1] = signext28(read_ioreg32(REG_BG3X_L));
break;
// BG3 reference Y
case REG_BG3Y_L:
case REG_BG3Y_H:
write_ioreg(ioreg, value);
affine_reference_y[1] = signext28(read_ioreg32(REG_BG3Y_L));
break;
// Sound 1 registers
case REG_SOUND1CNT_L: // control sweep
gbc_sound_tone_control_sweep();
break;
case REG_SOUND1CNT_H: // control duty/length/envelope
gbc_sound_tone_control_low(0, REG_SOUND1CNT_H);
break;
case REG_SOUND1CNT_X: // control frequency
gbc_sound_tone_control_high(0, REG_SOUND1CNT_X);
break;
// Sound 2 registers
case REG_SOUND2CNT_L: // control duty/length/envelope
gbc_sound_tone_control_low(1, REG_SOUND2CNT_L);
break;
case REG_SOUND2CNT_H: // control frequency
gbc_sound_tone_control_high(1, REG_SOUND2CNT_H);
break;
// Sound 3 registers
case REG_SOUND3CNT_L: // control wave
gbc_sound_wave_control();
break;
case REG_SOUND3CNT_H: // control length/volume
gbc_sound_tone_control_low_wave();
break;
case REG_SOUND3CNT_X: // control frequency
gbc_sound_tone_control_high_wave();
break;
// Sound 4 registers
case REG_SOUND4CNT_L: // length/envelope
gbc_sound_tone_control_low(3, REG_SOUND4CNT_L);
break;
case REG_SOUND4CNT_H: // control frequency
gbc_sound_noise_control();
break;
// Sound control registers
case REG_SOUNDCNT_L:
gbc_trigger_sound(value);
break;
case REG_SOUNDCNT_H:
trigger_sound();
break;
case REG_SOUNDCNT_X:
sound_control_x(value);
break;
// Sound wave RAM, flag wave table update
case REG_SOUNDWAVE_0 ... REG_SOUNDWAVE_7:
render_gbc_sound();
gbc_sound_wave_update = 1;
write_ioreg(ioreg, value);
break;
// DMA control register: can cause an IRQ
case REG_DMA0CNT_H: return trigger_dma(0, value);
case REG_DMA1CNT_H: return trigger_dma(1, value);
case REG_DMA2CNT_H: return trigger_dma(2, value);
case REG_DMA3CNT_H: return trigger_dma(3, value);
// Timer counter reload
case REG_TM0D: count_timer(0); break;
case REG_TM1D: count_timer(1); break;
case REG_TM2D: count_timer(2); break;
case REG_TM3D: count_timer(3); break;
/* Timer control register (0..3)*/
case REG_TM0CNT: trigger_timer(0, value); break;
case REG_TM1CNT: trigger_timer(1, value); break;
case REG_TM2CNT: trigger_timer(2, value); break;
case REG_TM3CNT: trigger_timer(3, value); break;
// Interrupt flag, clears the bits it tries to write
case REG_IF:
write_ioreg(REG_IF, read_ioreg(REG_IF) & (~value));
break;
// Register writes with side-effects, can raise an IRQ
case REG_IE:
case REG_IME:
write_ioreg(ioreg, value);
return check_interrupt();
// Read-only registers
case REG_P1:
case REG_VCOUNT:
break; // Do nothing
case REG_WAITCNT:
write_ioreg(REG_WAITCNT, value);
reload_timing_info();
break;
// Registers without side effects
default:
write_ioreg(ioreg, value);
break;
}
return CPU_ALERT_NONE;
}
cpu_alert_type function_cc write_io_register8(u32 address, u32 value)
{
if (address == 0x301) {
if (value & 1)
reg[CPU_HALT_STATE] = CPU_STOP;
else
reg[CPU_HALT_STATE] = CPU_HALT;
return CPU_ALERT_HALT;
}
// Partial 16 bit write, treat like a regular merge-write
if (address & 1)
value = (value << 8) | (read_ioreg(address >> 1) & 0x00ff);
else
value = (value & 0xff) | (read_ioreg(address >> 1) & 0xff00);
return write_io_register16(address & 0x3FE, value);
}
cpu_alert_type function_cc write_io_register32(u32 address, u32 value)
{
// Handle sound FIFO data write
if (address == 0xA0) {
sound_timer_queue32(0, value);
return CPU_ALERT_NONE;
}
else if (address == 0xA4) {
sound_timer_queue32(1, value);
return CPU_ALERT_NONE;
}
// Perform two 16 bit writes. Low part goes first apparently.
// Some Count+Control DMA writes use 32 bit, so control must be last.
cpu_alert_type allow = write_io_register16(address, value & 0xFFFF);
cpu_alert_type alhigh = write_io_register16(address + 2, value >> 16);
return allow | alhigh;
}
#define write_palette8(address, value) \
{ \
u32 aladdr = address & ~1U; \
u16 val16 = (value << 8) | value; \
address16(palette_ram, aladdr) = eswap16(val16); \
address16(palette_ram_converted, aladdr) = convert_palette(val16); \
}
#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_EEPROM)
return;
if(backup_type == BACKUP_UNKN)
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_bank_cnt = 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)
{
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_bank_cnt == 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
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...)
#define RTC_DISABLED 0
#define RTC_IDLE 1
#define RTC_COMMAND 2
#define RTC_OUTPUT_DATA 3
#define RTC_INPUT_DATA 4
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;
#define RTC_WRITE_TIME 0
#define RTC_WRITE_TIME_FULL 1
#define RTC_WRITE_STATUS 2
static bool rtc_enabled = false, rumble_enabled = false;
// I/O registers (for RTC, rumble, etc)
u8 gpio_regs[3];
// RTC tracking variables
u32 rtc_state = RTC_DISABLED;
u32 rtc_write_mode;
u32 rtc_command;
u64 rtc_data;
u32 rtc_data_bits;
u32 rtc_status = 0x40;
s32 rtc_bit_count;
// Rumble trackin vars, not really preserved (it's just aproximate)
static u32 rumble_enable_tick, rumble_ticks;
static u8 encode_bcd(u8 value)
{
int l = 0;
int h = 0;
value = value % 100;
l = value % 10;
h = value / 10;
return h * 16 + l;
}
void update_gpio_romregs() {
if (rtc_enabled || rumble_enabled) {
// Update the registers in the ROM mapped buffer.
u8 *map = memory_map_read[0x8000000 >> 15];
if (map) {
if (gpio_regs[2]) {
// Registers are visible, readable:
address16(map, 0xC4) = eswap16(gpio_regs[0]);
address16(map, 0xC6) = eswap16(gpio_regs[1]);
address16(map, 0xC8) = eswap16(gpio_regs[2]);
} else {
// Registers are write-only, just read out zero
address16(map, 0xC4) = 0;
address16(map, 0xC6) = 0;
address16(map, 0xC8) = 0;
}
}
}
}
#define GPIO_RTC_CLK 0x1
#define GPIO_RTC_DAT 0x2
#define GPIO_RTC_CSS 0x4
static void write_rtc(u8 old, u8 new)
{
// RTC works using a high CS and falling edge capture for the clock signal.
if (!(new & GPIO_RTC_CSS)) {
// Chip select is down, reset the RTC protocol. And do not process input.
rtc_state = RTC_IDLE;
rtc_command = 0;
rtc_bit_count = 0;
return;
}
// CS low to high transition!
if (!(old & GPIO_RTC_CSS))
rtc_state = RTC_COMMAND;
if ((old & GPIO_RTC_CLK) && !(new & GPIO_RTC_CLK)) {
// Advance clock state, input/ouput data.
switch (rtc_state) {
case RTC_COMMAND:
rtc_command <<= 1;
rtc_command |= ((new >> 1) & 1);
// 8 bit command read, process:
if (++rtc_bit_count == 8) {
switch (rtc_command) {
case RTC_COMMAND_RESET:
case RTC_COMMAND_WRITE_STATUS:
rtc_state = RTC_INPUT_DATA;
rtc_data = 0;
rtc_data_bits = 8;
rtc_write_mode = RTC_WRITE_STATUS;
break;
case RTC_COMMAND_READ_STATUS:
rtc_state = RTC_OUTPUT_DATA;
rtc_data_bits = 8;
rtc_data = rtc_status;
break;
case RTC_COMMAND_OUTPUT_TIME_FULL:
{
struct tm *current_time;
time_t current_time_flat;
time(&current_time_flat);
current_time = localtime(&current_time_flat);
rtc_state = RTC_OUTPUT_DATA;
rtc_data_bits = 56;
rtc_data = ((u64)encode_bcd(current_time->tm_year)) |
((u64)encode_bcd(current_time->tm_mon+1)<< 8) |
((u64)encode_bcd(current_time->tm_mday) << 16) |
((u64)encode_bcd(current_time->tm_wday) << 24) |
((u64)encode_bcd(current_time->tm_hour) << 32) |
((u64)encode_bcd(current_time->tm_min) << 40) |
((u64)encode_bcd(current_time->tm_sec) << 48);
}
break;
case RTC_COMMAND_OUTPUT_TIME:
{
struct tm *current_time;
time_t current_time_flat;
time(&current_time_flat);
current_time = localtime(&current_time_flat);
rtc_state = RTC_OUTPUT_DATA;
rtc_data_bits = 24;
rtc_data = (encode_bcd(current_time->tm_hour)) |
(encode_bcd(current_time->tm_min) << 8) |
(encode_bcd(current_time->tm_sec) << 16);
}
break;
};
rtc_bit_count = 0;
}
break;
case RTC_INPUT_DATA:
rtc_data <<= 1;
rtc_data |= ((new >> 1) & 1);
rtc_data_bits--;
if (!rtc_data_bits) {
rtc_status = rtc_data; // HACK: assuming write status here.
rtc_state = RTC_IDLE;
}
break;
case RTC_OUTPUT_DATA:
// Output the next bit from rtc_data
if (!(gpio_regs[1] & 0x2)) {
// Only output if the port is set to OUT!
u32 bit = rtc_data & 1;
gpio_regs[0] = (new & ~0x2) | ((bit) << 1);
}
rtc_data >>= 1;
rtc_data_bits--;
if (!rtc_data_bits)
rtc_state = RTC_IDLE; // Finish transmission!
break;
};
}
}
static void write_rumble(u8 old, u8 new) {
if (new && !old)
rumble_enable_tick = cpu_ticks;
else if (!new && old) {
rumble_ticks += (cpu_ticks - rumble_enable_tick);
rumble_enable_tick = 0;
}
}
void rumble_frame_reset() {
// Reset the tick initial value to frame start (only if active)
rumble_ticks = 0;
if (rumble_enable_tick)
rumble_enable_tick = cpu_ticks;
}
float rumble_active_pct() {
// Calculate the percentage of Rumble active for this frame.
u32 active_ticks = rumble_ticks;
// If the rumble is still active, account for the due cycles
if (rumble_enable_tick)
active_ticks += (cpu_ticks - rumble_enable_tick);
return active_ticks / (GBC_BASE_RATE / 60);
}
void function_cc write_gpio(u32 address, u32 value) {
u8 prev_value = gpio_regs[0];
switch(address) {
case 0xC4:
// Any writes do not affect input pins:
gpio_regs[0] = (gpio_regs[0] & ~gpio_regs[1]) | (value & gpio_regs[1]);
break;
case 0xC6:
gpio_regs[1] = value & 0xF;
break;
case 0xC8: /* I/O port control */
gpio_regs[2] = value & 1;
break;
};
// If the game has an RTC, ensure it gets the data
if (rtc_enabled && (prev_value & 0x7) != (gpio_regs[0] & 0x7))
write_rtc(prev_value & 0x7, gpio_regs[0] & 0x7);
if (rumble_enabled && (prev_value & 0x8) != (gpio_regs[0] & 0x8))
write_rumble(prev_value & 0x8, gpio_regs[0] & 0x8);
// Reflect the values
update_gpio_romregs();
}
#define write_gpio8() \
#define write_gpio16() \
write_gpio(address & 0xFF, value) \
#define write_gpio32() \
#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 */ \
if (type != 8) { \
reg[OAM_UPDATED] = 1; \
address##type(oam_ram, address & 0x3FF) = eswap##type(value); \
} \
break; \
\
case 0x08: \
/* gamepak ROM or RTC */ \
write_gpio##type(); \
break; \
\
case 0x09: \
case 0x0A: \
case 0x0B: \
case 0x0C: \
/* gamepak ROM space */ \
break; \
\
case 0x0D: \
write_eeprom##type(address, value); \
break; \
\
case 0x0E: \
write_backup##type(); \
break; \
} \
u32 function_cc read_memory8(u32 address)
{
u8 value;
read_memory(8);
return value;
}
u32 function_cc 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 function_cc 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;
}
typedef struct
{
char gamepak_title[13];
char gamepak_code[5];
char gamepak_maker[3];
u16 flags;
u32 idle_loop_target_pc;
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;
#define FLAGS_FLASH_128KB 0x0001
#define FLAGS_RUMBLE 0x0002
#define FLAGS_RTC 0x0004
#define FLAGS_EEPROM 0x0010
#include "gba_over.h"
static void 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;
if (gbaover[i].flags & FLAGS_FLASH_128KB) {
flash_device_id = FLASH_DEVICE_MACRONIX_128KB;
flash_bank_cnt = FLASH_SIZE_128KB;
}
if (gbaover[i].flags & FLAGS_RTC)
rtc_enabled = true;
if (gbaover[i].flags & FLAGS_RUMBLE)
rumble_enabled = true;
if (gbaover[i].flags & FLAGS_EEPROM)
backup_type_reset = BACKUP_EEPROM;
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++;
}
}
}
// 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 = 0,
DMA_REGION_EWRAM = 1,
DMA_REGION_VRAM = 2,
DMA_REGION_PALETTE_RAM = 3,
DMA_REGION_OAM_RAM = 4,
DMA_REGION_IO = 5,
DMA_REGION_EXT = 6,
DMA_REGION_GAMEPAK = 7,
DMA_REGION_BUS = 8,
DMA_REGION_COUNT = 9
} dma_region_type;
const dma_region_type dma_region_map[17] =
{
DMA_REGION_BUS, // 0x00 - BUS
DMA_REGION_BUS, // 0x01 - BUS
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_BUS // 0x10 - Out of region (assuming open bus)
};
#define dma_print(src_op, dest_op, tfsize) \
printf("dma from %x (%s) to %x (%s) for %x (%s) (%d) (pc %x)\n", \
src_ptr, #src_op, dest_ptr, #dest_op, length, #tfsize, \
dma->irq, reg[15]); \
#define dma_oam_ram_dest() \
reg[OAM_UPDATED] = 1 \
#define dma_vars_oam_ram(type) \
dma_oam_ram_##type() \
#define dma_vars_iwram(type)
#define dma_vars_ewram(type)
#define dma_vars_io(type)
#define dma_vars_vram(type)
#define dma_vars_palette_ram(type)
#define dma_vars_bus(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, tfsize) \
read_value = readaddress##tfsize(iwram + 0x8000, type##_ptr & 0x7FFF) \
#define dma_read_vram(type, tfsize) { \
u32 rdaddr = type##_ptr & 0x1FFFF; \
if (rdaddr >= 0x18000) rdaddr -= 0x8000; \
read_value = readaddress##tfsize(vram, rdaddr); \
}
#define dma_read_io(type, tfsize) \
read_value = readaddress##tfsize(io_registers, type##_ptr & 0x3FF) \
#define dma_read_oam_ram(type, tfsize) \
read_value = readaddress##tfsize(oam_ram, type##_ptr & 0x3FF) \
#define dma_read_palette_ram(type, tfsize) \
read_value = readaddress##tfsize(palette_ram, type##_ptr & 0x3FF) \
#define dma_read_ewram(type, tfsize) \
read_value = readaddress##tfsize(ewram, type##_ptr & 0x3FFFF) \
#define dma_read_gamepak(type, tfsize) \
dma_gamepak_check_region(type); \
read_value = readaddress##tfsize(type##_address_block, \
type##_ptr & 0x7FFF) \
// DMAing from the BIOS/open zone causes previous DMA values to be read
#define dma_read_bus(type, tfsize)
#define dma_read_ext(type, tfsize) \
read_value = read_memory##tfsize(type##_ptr) \
#define dma_write_iwram(type, tfsize) \
address##tfsize(iwram + 0x8000, type##_ptr & 0x7FFF) = \
eswap##tfsize(read_value); \
if (address##tfsize(iwram, type##_ptr & 0x7FFF)) \
alerts |= CPU_ALERT_SMC; \
#define dma_write_vram(type, tfsize) { \
u32 wraddr = type##_ptr & 0x1FFFF; \
if (wraddr >= 0x18000) wraddr -= 0x8000; \
address##tfsize(vram, wraddr) = eswap##tfsize(read_value); \
}
#define dma_write_io(type, tfsize) \
alerts |= write_io_register##tfsize(type##_ptr & 0x3FF, read_value) \
#define dma_write_oam_ram(type, tfsize) \
address##tfsize(oam_ram, type##_ptr & 0x3FF) = eswap##tfsize(read_value) \
#define dma_write_palette_ram(type, tfsize) \
write_palette##tfsize(type##_ptr & 0x3FF, read_value) \
#define dma_write_ext(type, tfsize) \
write_memory##tfsize(type##_ptr, read_value) \
#define dma_write_ewram(type, tfsize) \
address##tfsize(ewram, type##_ptr & 0x3FFFF) = eswap##tfsize(read_value); \
if (address##tfsize(ewram, (type##_ptr & 0x3FFFF) + 0x40000)) \
alerts |= CPU_ALERT_SMC; \
#define print_line() \
dma_print(src_op, dest_op, tfsize); \
#define dma_tfloop(src_region_type, dest_region_type, src_op, dest_op, tfsize)\
{ \
dma_vars_##src_region_type(src); \
dma_vars_##dest_region_type(dest); \
\
for(i = 0; i < length; i++) \
{ \
dma_read_##src_region_type(src, tfsize); \
dma_write_##dest_region_type(dest, tfsize); \
src_ptr += src_op; \
dest_ptr += dest_op; \
} \
break; \
} \
#define dma_tf_loop_builder(tfsize) \
\
cpu_alert_type dma_tf_loop##tfsize( \
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 = dma_bus_val; \
cpu_alert_type alerts = CPU_ALERT_NONE; \
u32 src_region = MIN(src_ptr >> 24, 16); \
u32 dest_region = MIN(dest_ptr >> 24, 16); \
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 * DMA_REGION_COUNT) \
{ \
default: \
/* Do nothing (read-only destination or unmapped area...) */ \
return CPU_ALERT_NONE; \
\
case DMA_REGION_BUS + DMA_REGION_IWRAM * DMA_REGION_COUNT: \
dma_tfloop(bus, iwram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IWRAM + DMA_REGION_IWRAM * DMA_REGION_COUNT: \
dma_tfloop(iwram, iwram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_EWRAM + DMA_REGION_IWRAM * DMA_REGION_COUNT: \
dma_tfloop(ewram, iwram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_VRAM + DMA_REGION_IWRAM * DMA_REGION_COUNT: \
dma_tfloop(vram, iwram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_PALETTE_RAM + DMA_REGION_IWRAM * DMA_REGION_COUNT: \
dma_tfloop(palette_ram, iwram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_OAM_RAM + DMA_REGION_IWRAM * DMA_REGION_COUNT: \
dma_tfloop(oam_ram, iwram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IO + DMA_REGION_IWRAM * DMA_REGION_COUNT: \
dma_tfloop(io, iwram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_GAMEPAK + DMA_REGION_IWRAM * DMA_REGION_COUNT: \
dma_tfloop(gamepak, iwram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_EXT + DMA_REGION_IWRAM * DMA_REGION_COUNT: \
dma_tfloop(ext, iwram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_BUS + DMA_REGION_EWRAM * DMA_REGION_COUNT: \
dma_tfloop(bus, ewram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IWRAM + DMA_REGION_EWRAM * DMA_REGION_COUNT: \
dma_tfloop(iwram, ewram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_EWRAM + DMA_REGION_EWRAM * DMA_REGION_COUNT: \
dma_tfloop(ewram, ewram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_VRAM + DMA_REGION_EWRAM * DMA_REGION_COUNT: \
dma_tfloop(vram, ewram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_PALETTE_RAM + DMA_REGION_EWRAM * DMA_REGION_COUNT: \
dma_tfloop(palette_ram, ewram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_OAM_RAM + DMA_REGION_EWRAM * DMA_REGION_COUNT: \
dma_tfloop(oam_ram, ewram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IO + DMA_REGION_EWRAM * DMA_REGION_COUNT: \
dma_tfloop(io, ewram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_GAMEPAK + DMA_REGION_EWRAM * DMA_REGION_COUNT: \
dma_tfloop(gamepak, ewram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_EXT + DMA_REGION_EWRAM * DMA_REGION_COUNT: \
dma_tfloop(ext, ewram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_BUS + DMA_REGION_VRAM * DMA_REGION_COUNT: \
dma_tfloop(bus, vram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IWRAM + DMA_REGION_VRAM * DMA_REGION_COUNT: \
dma_tfloop(iwram, vram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_EWRAM + DMA_REGION_VRAM * DMA_REGION_COUNT: \
dma_tfloop(ewram, vram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_VRAM + DMA_REGION_VRAM * DMA_REGION_COUNT: \
dma_tfloop(vram, vram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_PALETTE_RAM + DMA_REGION_VRAM * DMA_REGION_COUNT: \
dma_tfloop(palette_ram, vram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_OAM_RAM + DMA_REGION_VRAM * DMA_REGION_COUNT: \
dma_tfloop(oam_ram, vram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IO + DMA_REGION_VRAM * DMA_REGION_COUNT: \
dma_tfloop(io, vram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_GAMEPAK + DMA_REGION_VRAM * DMA_REGION_COUNT: \
dma_tfloop(gamepak, vram, src_strd, dest_strd,tfsize); \
\
case DMA_REGION_EXT + DMA_REGION_VRAM * DMA_REGION_COUNT: \
dma_tfloop(ext, vram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_BUS + DMA_REGION_PALETTE_RAM * DMA_REGION_COUNT: \
dma_tfloop(bus, palette_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IWRAM + DMA_REGION_PALETTE_RAM * DMA_REGION_COUNT: \
dma_tfloop(iwram, palette_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_EWRAM + DMA_REGION_PALETTE_RAM * DMA_REGION_COUNT: \
dma_tfloop(ewram, palette_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_VRAM + DMA_REGION_PALETTE_RAM * DMA_REGION_COUNT: \
dma_tfloop(vram, palette_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_PALETTE_RAM + DMA_REGION_PALETTE_RAM * DMA_REGION_COUNT: \
dma_tfloop(palette_ram, palette_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_OAM_RAM + DMA_REGION_PALETTE_RAM * DMA_REGION_COUNT: \
dma_tfloop(oam_ram, palette_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IO + DMA_REGION_PALETTE_RAM * DMA_REGION_COUNT: \
dma_tfloop(io, palette_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_GAMEPAK + DMA_REGION_PALETTE_RAM * DMA_REGION_COUNT: \
dma_tfloop(gamepak, palette_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_EXT + DMA_REGION_PALETTE_RAM * DMA_REGION_COUNT: \
dma_tfloop(ext, palette_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_BUS + DMA_REGION_OAM_RAM * DMA_REGION_COUNT: \
dma_tfloop(bus, oam_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IWRAM + DMA_REGION_OAM_RAM * DMA_REGION_COUNT: \
dma_tfloop(iwram, oam_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_EWRAM + DMA_REGION_OAM_RAM * DMA_REGION_COUNT: \
dma_tfloop(ewram, oam_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_VRAM + DMA_REGION_OAM_RAM * DMA_REGION_COUNT: \
dma_tfloop(vram, oam_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_PALETTE_RAM + DMA_REGION_OAM_RAM * DMA_REGION_COUNT: \
dma_tfloop(palette_ram, oam_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_OAM_RAM + DMA_REGION_OAM_RAM * DMA_REGION_COUNT: \
dma_tfloop(oam_ram, oam_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IO + DMA_REGION_OAM_RAM * DMA_REGION_COUNT: \
dma_tfloop(io, oam_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_GAMEPAK + DMA_REGION_OAM_RAM * DMA_REGION_COUNT: \
dma_tfloop(gamepak, oam_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_EXT + DMA_REGION_OAM_RAM * DMA_REGION_COUNT: \
dma_tfloop(ext, oam_ram, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_BUS + DMA_REGION_IO * DMA_REGION_COUNT: \
dma_tfloop(bus, io, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IWRAM + DMA_REGION_IO * DMA_REGION_COUNT: \
dma_tfloop(iwram, io, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_EWRAM + DMA_REGION_IO * DMA_REGION_COUNT: \
dma_tfloop(ewram, io, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_VRAM + DMA_REGION_IO * DMA_REGION_COUNT: \
dma_tfloop(vram, io, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_PALETTE_RAM + DMA_REGION_IO * DMA_REGION_COUNT: \
dma_tfloop(palette_ram, io, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_OAM_RAM + DMA_REGION_IO * DMA_REGION_COUNT: \
dma_tfloop(oam_ram, io, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IO + DMA_REGION_IO * DMA_REGION_COUNT: \
dma_tfloop(io, io, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_GAMEPAK + DMA_REGION_IO * DMA_REGION_COUNT: \
dma_tfloop(gamepak, io, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_EXT + DMA_REGION_IO * DMA_REGION_COUNT: \
dma_tfloop(ext, io, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_BUS + DMA_REGION_EXT * DMA_REGION_COUNT: \
dma_tfloop(bus, ext, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IWRAM + DMA_REGION_EXT * DMA_REGION_COUNT: \
dma_tfloop(iwram, ext, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_EWRAM + DMA_REGION_EXT * DMA_REGION_COUNT: \
dma_tfloop(ewram, ext, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_VRAM + DMA_REGION_EXT * DMA_REGION_COUNT: \
dma_tfloop(vram, ext, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_PALETTE_RAM + DMA_REGION_EXT * DMA_REGION_COUNT: \
dma_tfloop(palette_ram, ext, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_OAM_RAM + DMA_REGION_EXT * DMA_REGION_COUNT: \
dma_tfloop(oam_ram, ext, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_IO + DMA_REGION_EXT * DMA_REGION_COUNT: \
dma_tfloop(io, ext, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_GAMEPAK + DMA_REGION_EXT * DMA_REGION_COUNT: \
dma_tfloop(gamepak, ext, src_strd, dest_strd, tfsize); \
\
case DMA_REGION_EXT + DMA_REGION_EXT * DMA_REGION_COUNT: \
dma_tfloop(ext, ext, src_strd, dest_strd, tfsize); \
} \
\
/* Remember the last value copied in case we read from a bad zone */ \
dma_bus_val = read_value; \
\
dma->source_address = src_ptr; \
if (wb) /* Update destination pointer if requested */ \
dma->dest_address = dest_ptr; \
\
return alerts; \
} \
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, int *usedcycles)
{
dma_transfer_type *dmach = &dma[dma_chan];
u32 src_ptr = 0x0FFFFFFF & dmach->source_address & (
dmach->length_type == DMA_16BIT ? ~1U : ~3U);
u32 dst_ptr = 0x0FFFFFFF & 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;
}
// Trigger an IRQ if configured to do so.
if (dmach->irq)
ret |= flag_interrupt(IRQ_DMA0 << dma_chan);
// This is an approximation for the most common case (no region cross)
if (usedcycles)
*usedcycles += dmach->length * (
def_seq_cycles[src_ptr >> 24][tfsizes - 1] +
def_seq_cycles[dst_ptr >> 24][tfsizes - 1]);
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;
filestream_seek(gamepak_file_large, physical_index * (32 * 1024), SEEK_SET);
filestream_read(gamepak_file_large, swap_location, (32 * 1024));
// Map it to the read handlers now
map_rom_entry(read, physical_index, swap_location, gamepak_size >> 15);
// When mapping page 0, we might need to reflect the GPIO regs.
if (physical_index == 0)
update_gpio_romregs();
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(gamepak_buffer_blocksize);
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;
}
bool gamepak_must_swap(void)
{
// Returns whether the current gamepak buffer is not big enough to hold
// the full gamepak ROM. In these cases the device must swap.
return gamepak_buffer_count * gamepak_buffer_blocksize < gamepak_size;
}
void init_memory(void)
{
u32 map_offset = 0, i;
for (i = 0; i < DMA_CHAN_CNT; i++)
{
dma[i].start_type = DMA_INACTIVE;
dma[i].irq = DMA_NO_IRQ;
dma[i].source_address = dma[i].dest_address = 0;
dma[i].source_direction = dma[i].dest_direction = 0;
dma[i].length = 0;
dma[i].length_type = DMA_16BIT;
dma[i].repeat_type = DMA_NO_REPEAT;
dma[i].direct_sound_channel = DMA_NO_DIRECT_SOUND;
}
// 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);
reload_timing_info();
backup_type = backup_type_reset;
flash_bank_num = 0;
flash_command_position = 0;
eeprom_size = EEPROM_512_BYTE;
eeprom_mode = EEPROM_BASE_MODE;
eeprom_address = 0;
eeprom_counter = 0;
rumble_enable_tick = 0;
rumble_ticks = 0;
dma_bus_val = 0;
flash_mode = FLASH_BASE_MODE;
rtc_state = RTC_DISABLED;
memset(gpio_regs, 0, sizeof(gpio_regs));
reg[REG_BUS_VALUE] = 0xe129f000;
}
void memory_term(void)
{
if (gamepak_file_large)
{
filestream_close(gamepak_file_large);
gamepak_file_large = NULL;
}
while (gamepak_buffer_count)
{
free(gamepak_buffers[--gamepak_buffer_count]);
}
}
bool memory_check_savestate(const u8 *src)
{
static const char *vars32[] = {
"backup-type","flash-mode", "flash-cmd-pos", "flash-bank-num", "flash-dev-id",
"flash-size", "eeprom-size", "eeprom-mode", "eeprom-addr", "eeprom-counter",
"rtc-state", "rtc-write-mode", "rtc-cmd", "rtc-status", "rtc-data-bit-cnt", "rtc-bit-cnt",
};
static const char *dmavars32[] = {
"src-addr", "dst-addr", "src-dir", "dst-dir",
"len", "size", "repeat", "start", "dsc", "irq"
};
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;
// Check memory buffers (TODO: check sizes!)
if (!bson_contains_key(memdoc, "iwram", BSON_TYPE_BIN) ||
!bson_contains_key(memdoc, "ewram", BSON_TYPE_BIN) ||
!bson_contains_key(memdoc, "vram", BSON_TYPE_BIN) ||
!bson_contains_key(memdoc, "oamram", BSON_TYPE_BIN) ||
!bson_contains_key(memdoc, "palram", BSON_TYPE_BIN) ||
!bson_contains_key(memdoc, "ioregs", BSON_TYPE_BIN) ||
!bson_contains_key(memdoc, "dma-bus", BSON_TYPE_INT32))
return false;
// Check backup variables
for (i = 0; i < sizeof(vars32)/sizeof(vars32[0]); i++)
if (!bson_contains_key(bakdoc, vars32[i], BSON_TYPE_INT32))
return false;
if (!bson_contains_key(bakdoc, "gpio-regs", BSON_TYPE_BIN) ||
!bson_contains_key(bakdoc, "rtc-data-words", BSON_TYPE_ARR))
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 (!dmastr)
return false;
for (i = 0; i < sizeof(dmavars32)/sizeof(dmavars32[0]); i++)
if (!bson_contains_key(dmastr, dmavars32[i], BSON_TYPE_INT32))
return false;
}
return true;
}
bool memory_read_savestate(const u8 *src)
{
int i;
u32 rtc_data_array[2];
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(memdoc, "dma-bus", &dma_bus_val) &&
bson_read_int32(bakdoc, "backup-type", &backup_type) &&
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-size", &flash_bank_cnt) &&
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_bytes(bakdoc, "gpio-regs", gpio_regs, sizeof(gpio_regs)) &&
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-bit-cnt", &rtc_data_bits) &&
bson_read_int32(bakdoc, "rtc-bit-cnt", (u32*)&rtc_bit_count) &&
bson_read_int32_array(bakdoc, "rtc-data-words", rtc_data_array, 2)))
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;
}
rtc_data = rtc_data_array[0] | (((u64)rtc_data_array[1]) << 32);
return true;
}
unsigned memory_write_savestate(u8 *dst)
{
int i;
u8 *wbptr, *wbptr2, *startp = dst;
u32 rtc_data_array[2] = { (u32)rtc_data, (u32)(rtc_data >> 32) };
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_write_int32(dst, "dma-bus", dma_bus_val);
bson_finish_document(dst, wbptr);
bson_start_document(dst, "backup", wbptr);
bson_write_int32(dst, "backup-type", (u32)backup_type);
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-size", flash_bank_cnt);
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_bytes(dst, "gpio-regs", gpio_regs, sizeof(gpio_regs));
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-bit-cnt", rtc_data_bits);
bson_write_int32(dst, "rtc-bit-cnt", rtc_bit_count);
bson_write_int32array(dst, "rtc-data-words", rtc_data_array, 2);
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 = filestream_open(name, RETRO_VFS_FILE_ACCESS_READ,
RETRO_VFS_FILE_ACCESS_HINT_NONE);
if(gamepak_file_large)
{
// Round size to 32KB pages
gamepak_size = (u32)filestream_get_size(gamepak_file_large);
gamepak_size = (gamepak_size + 0x7FFF) & ~0x7FFF;
// Load stuff in 1MB chunks
u32 buf_blocks = (gamepak_size + gamepak_buffer_blocksize-1) / (gamepak_buffer_blocksize);
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
filestream_read(gamepak_file_large, gamepak_buffers[i], gamepak_buffer_blocksize);
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,
int force_rtc, int force_rumble)
{
gamepak_info_t gpinfo;
if (load_gamepak_raw(name))
return -1;
// 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;
translation_gate_targets = 0;
flash_device_id = FLASH_DEVICE_MACRONIX_64KB;
flash_bank_cnt = FLASH_SIZE_64KB;
rtc_enabled = false;
rumble_enabled = false;
backup_type_reset = BACKUP_UNKN;
load_game_config_over(&gpinfo);
// Forced RTC / Rumble modes, override the autodetect logic.
if (force_rtc != FEAT_AUTODETECT)
rtc_enabled = (force_rtc == FEAT_ENABLE);
if (force_rumble != FEAT_AUTODETECT)
rumble_enabled = (force_rumble == FEAT_ENABLE);
return 0;
}
s32 load_bios(char *name)
{
RFILE *fd = filestream_open(name, RETRO_VFS_FILE_ACCESS_READ,
RETRO_VFS_FILE_ACCESS_HINT_NONE);
if(!fd)
return -1;
filestream_read(fd, bios_rom, 0x4000);
filestream_close(fd);
return 0;
}
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