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memory.cpp
222 lines (183 loc) · 4.89 KB
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memory.cpp
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/*
Skelton for retropc emulator
Author : Takeda.Toshiya
Date : 2010.09.16-
[ memory ]
*/
#include "memory.h"
#include "../fileio.h"
#define ADDR_MASK (MEMORY_ADDR_MAX - 1)
#define BANK_MASK (MEMORY_BANK_SIZE - 1)
void MEMORY::release()
{
free(read_table);
free(write_table);
}
uint32 MEMORY::read_data8(uint32 addr)
{
int bank = (addr & ADDR_MASK) >> addr_shift;
if(read_table[bank].dev != NULL) {
return read_table[bank].dev->read_memory_mapped_io8(addr);
}
else {
return read_table[bank].memory[addr & BANK_MASK];
}
}
void MEMORY::write_data8(uint32 addr, uint32 data)
{
int bank = (addr & ADDR_MASK) >> addr_shift;
if(write_table[bank].dev != NULL) {
write_table[bank].dev->write_memory_mapped_io8(addr, data);
}
else {
write_table[bank].memory[addr & BANK_MASK] = data;
}
}
uint32 MEMORY::read_data16(uint32 addr)
{
int bank = (addr & ADDR_MASK) >> addr_shift;
if(read_table[bank].dev != NULL) {
return read_table[bank].dev->read_memory_mapped_io16(addr);
}
else {
uint32 val = read_data8(addr);
val |= read_data8(addr + 1) << 8;
return val;
}
}
void MEMORY::write_data16(uint32 addr, uint32 data)
{
int bank = (addr & ADDR_MASK) >> addr_shift;
if(write_table[bank].dev != NULL) {
write_table[bank].dev->write_memory_mapped_io16(addr, data);
}
else {
write_data8(addr, data & 0xff);
write_data8(addr + 1, (data >> 8) & 0xff);
}
}
uint32 MEMORY::read_data32(uint32 addr)
{
int bank = (addr & ADDR_MASK) >> addr_shift;
if(read_table[bank].dev != NULL) {
return read_table[bank].dev->read_memory_mapped_io32(addr);
}
else {
uint32 val = read_data16(addr);
val |= read_data16(addr + 2) << 16;
return val;
}
}
void MEMORY::write_data32(uint32 addr, uint32 data)
{
int bank = (addr & ADDR_MASK) >> addr_shift;
if(write_table[bank].dev != NULL) {
write_table[bank].dev->write_memory_mapped_io32(addr, data);
}
else {
write_data16(addr, data & 0xffff);
write_data16(addr + 2, (data >> 16) & 0xffff);
}
}
// register
void MEMORY::set_memory_r(uint32 start, uint32 end, uint8 *memory)
{
uint32 start_bank = start >> addr_shift;
uint32 end_bank = end >> addr_shift;
for(uint32 i = start_bank; i <= end_bank; i++) {
read_table[i].dev = NULL;
read_table[i].memory = memory + MEMORY_BANK_SIZE * (i - start_bank);
}
}
void MEMORY::set_memory_w(uint32 start, uint32 end, uint8 *memory)
{
uint32 start_bank = start >> addr_shift;
uint32 end_bank = end >> addr_shift;
for(uint32 i = start_bank; i <= end_bank; i++) {
write_table[i].dev = NULL;
write_table[i].memory = memory + MEMORY_BANK_SIZE * (i - start_bank);
}
}
void MEMORY::set_memory_mapped_io_r(uint32 start, uint32 end, DEVICE *device)
{
uint32 start_bank = start >> addr_shift;
uint32 end_bank = end >> addr_shift;
for(uint32 i = start_bank; i <= end_bank; i++) {
read_table[i].dev = device;
}
}
void MEMORY::set_memory_mapped_io_w(uint32 start, uint32 end, DEVICE *device)
{
uint32 start_bank = start >> addr_shift;
uint32 end_bank = end >> addr_shift;
for(uint32 i = start_bank; i <= end_bank; i++) {
write_table[i].dev = device;
}
}
void MEMORY::unset_memory_r(uint32 start, uint32 end)
{
uint32 start_bank = start >> addr_shift;
uint32 end_bank = end >> addr_shift;
for(uint32 i = start_bank; i <= end_bank; i++) {
read_table[i].dev = NULL;
read_table[i].memory = read_dummy;
}
}
void MEMORY::unset_memory_w(uint32 start, uint32 end)
{
uint32 start_bank = start >> addr_shift;
uint32 end_bank = end >> addr_shift;
for(uint32 i = start_bank; i <= end_bank; i++) {
write_table[i].dev = NULL;
write_table[i].memory = write_dummy;
}
}
// load/save image
int MEMORY::read_bios(_TCHAR *file_name, uint8 *buffer, int size)
{
FILEIO* fio = new FILEIO();
int length = 0;
if(fio->Fopen(emu->bios_path(file_name), FILEIO_READ_BINARY)) {
fio->Fread(buffer, size, 1);
length = fio->Ftell();
fio->Fclose();
}
delete fio;
return length;
}
bool MEMORY::write_bios(_TCHAR *file_name, uint8 *buffer, int size)
{
FILEIO* fio = new FILEIO();
bool result = false;
if(fio->Fopen(emu->bios_path(file_name), FILEIO_WRITE_BINARY)) {
fio->Fwrite(buffer, size, 1);
fio->Fclose();
result = true;
}
delete fio;
return result;
}
bool MEMORY::read_image(_TCHAR *file_path, uint8 *buffer, int size)
{
FILEIO* fio = new FILEIO();
bool result = false;
if(fio->Fopen(file_path, FILEIO_READ_BINARY)) {
fio->Fread(buffer, size, 1);
fio->Fclose();
result = true;
}
delete fio;
return result;
}
bool MEMORY::write_image(_TCHAR* file_path, uint8* buffer, int size)
{
FILEIO* fio = new FILEIO();
bool result = false;
if(fio->Fopen(file_path, FILEIO_WRITE_BINARY)) {
fio->Fwrite(buffer, size, 1);
fio->Fclose();
result = true;
}
delete fio;
return result;
}