JailDoctor/gameboy
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

- [NEW] Reestructurada tota la gestió de memòria i mapeig de sistemes

Browse Source
This commit is contained in:
Raimon Zamora
2025-01-28 12:57:12 +01:00
parent a64a18d1be
commit a617fec42a
7 changed files with 228 additions and 340 deletions
Download Patch File Download Diff File Expand all files Collapse all files

140
mbc_none.cpp
View File

@@ -1,152 +1,22 @@
#include "mbc_none.h"
#include "mem.h"
#include "sm83.h"
#include <stdlib.h>
#include <SDL2/SDL.h>
namespace mbc_none
{
uint8_t bootrom[256];
uint8_t *rom;
uint8_t vram[8192];
uint8_t exram[8192];
uint8_t wram[8192];
uint8_t hram[512];
uint8_t tags[65536];
void reset() { } // nothing to do
uint8_t getKeypad(uint8_t value)
{
const uint8_t *keys = SDL_GetKeyboardState(NULL);
value = value & 0xf0;
if (value & 0x10) {
if (!keys[SDL_SCANCODE_RETURN]) value = value | 0x8;
if (!keys[SDL_SCANCODE_SPACE]) value = value | 0x4;
if (!keys[SDL_SCANCODE_Z]) value = value | 0x2;
if (!keys[SDL_SCANCODE_X]) value = value | 0x1;
} else if (value & 0x20) {
if (!keys[SDL_SCANCODE_DOWN]) value = value | 0x8;
if (!keys[SDL_SCANCODE_UP]) value = value | 0x4;
if (!keys[SDL_SCANCODE_LEFT]) value = value | 0x2;
if (!keys[SDL_SCANCODE_RIGHT]) value = value | 0x1;
} else {
value = value | 0x0f;
}
return value;
}
uint8_t readRom(uint16_t address) { return rom[address]; }
uint8_t readMem(uint16_t address)
{
if (address < 0x8000) {
if ( (address < 0x0100) && ((hram[0x150]&0x01)==0) ) return bootrom[address];
return rom[address];
} else if (address < 0xA000) {
return vram[address - 0x8000];
} else if (address < 0xC000) {
return exram[address - 0xA000];
} else if (address < 0xE000) {
return wram[address - 0xC000];
} else if (address < 0xFE00) {
return wram[address - 0xE000];
} else {
if (address==0xFF00) {
hram[address - 0XFE00] = getKeypad(hram[address - 0XFE00]);
}
return hram[address - 0XFE00];
}
}
void writeRom(uint16_t address, uint8_t value) { } // do nothing
void writeMem(uint16_t address, uint8_t value)
{
if (address < 0x8000) {
// Read Only Memory, you know...
//rom[address] = value;
} else if (address < 0xA000) {
vram[address - 0x8000] = value;
} else if (address < 0xC000) {
exram[address - 0xA000] = value;
} else if (address < 0xE000) {
wram[address - 0xC000] = value;
} else if (address < 0xFE00) {
wram[address - 0xE000] = value;
} else {
if ( (address==0xFF50) && ((value&0x01) != 1) ) return; //Only allow disabling boot room
if ( (address==0xFF00) ) { value = value & 0x30; }
if ( (address==0xFF04) ) { hram[address-0xFE00] = 0; return; }
if ( (address==0xFF0F) ) { hram[address-0xFE00] = value; sm83::processInterrupts(); return; }
if ( (address==0xFF46) ) mem::init_dma_transfer(value);
hram[address - 0xFE00] = value;
}
}
uint8_t readRam(uint16_t address) { return 0xff; }
uint8_t getTag(uint16_t address)
{
return tags[address];
}
void setTag(uint16_t address, uint8_t value)
{
tags[address] = value;
}
void saveState(FILE* f)
{
}
void loadState(FILE *f)
{
}
uint8_t* rawPtr(uint16_t address)
{
if (address < 0x8000) {
if ( (address < 0x0100) && ((hram[0x150]&0x01)==0) ) return &bootrom[address];
return &rom[address];
} else if (address < 0xA000) {
return &vram[address - 0x8000];
} else if (address < 0xC000) {
return &exram[address - 0xA000];
} else if (address < 0xE000) {
return &wram[address - 0xC000];
} else if (address < 0xFE00) {
return &wram[address - 0xE000];
} else {
return &hram[address - 0XFE00];
}
}
void reset()
{
FILE *f = fopen("dmg_boot.bin", "rb");
if (!f) { printf("ABORTING: 'dmg_boot.bin' not found!\n"); exit(1); }
fseek(f, 0, SEEK_END);
const int size = ftell(f);
fseek(f, 0, SEEK_SET);
fread(bootrom, size, 1, f);
fclose(f);
for (int i=0; i<8192; ++i) { vram[i] = 0; }
for (int i=0; i<8192; ++i) { exram[i] = 0; }
for (int i=0; i<8192; ++i) { wram[i] = 0; }
for (int i=0; i<512; ++i) { hram[i] = 0; }
for (int i=0; i<65536; ++i) { tags[i] = MEMTAG_NONE; }
}
void writeRam(uint16_t address, uint8_t value) { } // do nothing
void init(uint8_t *rom, uint32_t rom_size, uint32_t ram_size)
{
mem::readMem = mbc_none::readMem;
mem::writeMem = mbc_none::writeMem;
mem::getTag = mbc_none::getTag;
mem::setTag = mbc_none::setTag;
mem::saveState = mbc_none::saveState;
mem::loadState = mbc_none::loadState;
mem::reset = mbc_none::reset;
mem::rawPtr = mbc_none::rawPtr;
mbc_none::rom = rom;
reset();
}
}