melonDS/NDS.cpp

#include <stdio.h>
#include <string.h>
#include "NDS.h"
#include "ARM.h"


namespace NDS
{

ARM* ARM9;
ARM* ARM7;

s32 ARM9Cycles, ARM7Cycles;

u8 ARM9BIOS[0x1000];
u8 ARM7BIOS[0x4000];

u8 MainRAM[0x400000];
u8 ARM7WRAM[0x10000];

bool Running;


void Init()
{
    ARM9 = new ARM(0);
    ARM7 = new ARM(1);

    Reset();
}

void Reset()
{
    FILE* f;

    f = fopen("bios9.bin", "rb");
    if (!f)
        printf("ARM9 BIOS not found\n");
    else
    {
        fseek(f, 0, SEEK_SET);
        fread(ARM9BIOS, 0x1000, 1, f);

        printf("ARM9 BIOS loaded: %08X\n", ARM9Read32(0xFFFF0000));
        fclose(f);
    }

    f = fopen("bios7.bin", "rb");
    if (!f)
        printf("ARM7 BIOS not found\n");
    else
    {
        fseek(f, 0, SEEK_SET);
        fread(ARM7BIOS, 0x4000, 1, f);

        printf("ARM7 BIOS loaded: %08X\n", ARM7Read32(0x00000000));
        fclose(f);
    }

    memset(MainRAM, 0, 0x400000);
    memset(ARM7WRAM, 0, 0x10000);

    ARM9->Reset();
    ARM7->Reset();

    ARM9Cycles = 0;
    ARM7Cycles = 0;

    Running = true; // hax
}


void RunFrame()
{
    s32 framecycles = 560190<<1;

    // very gross and temp. loop

    while (Running && framecycles>0)
    {
        ARM9Cycles = ARM9->Execute(32 + ARM9Cycles);
        ARM7Cycles = ARM7->Execute(16 + ARM7Cycles);

        framecycles -= 32;
    }
}


void Halt()
{
    Running = false;
}



u8 ARM9Read8(u32 addr)
{
    if ((addr & 0xFFFFF000) == 0xFFFF0000)
    {
        return *(u8*)&ARM9BIOS[addr & 0xFFF];
    }

    switch (addr & 0xFF000000)
    {
    case 0x02000000:
        return *(u8*)&MainRAM[addr & 0x3FFFFF];
    }

    printf("unknown arm9 read8 %08X\n", addr);
    return 0;
}

u16 ARM9Read16(u32 addr)
{
    if ((addr & 0xFFFFF000) == 0xFFFF0000)
    {
        return *(u16*)&ARM9BIOS[addr & 0xFFF];
    }

    switch (addr & 0xFF000000)
    {
    case 0x02000000:
        return *(u16*)&MainRAM[addr & 0x3FFFFF];
    }

    printf("unknown arm9 read16 %08X\n", addr);
    return 0;
}

u32 ARM9Read32(u32 addr)
{
    if ((addr & 0xFFFFF000) == 0xFFFF0000)
    {
        return *(u32*)&ARM9BIOS[addr & 0xFFF];
    }

    switch (addr & 0xFF000000)
    {
    case 0x02000000:
        return *(u32*)&MainRAM[addr & 0x3FFFFF];
    }

    printf("unknown arm9 read32 %08X\n", addr);
    return 0;
}

void ARM9Write8(u32 addr, u8 val)
{
    switch (addr & 0xFF000000)
    {
    case 0x02000000:
        *(u8*)&MainRAM[addr & 0x3FFFFF] = val;
        return;
    }

    printf("unknown arm9 write8 %08X %02X\n", addr, val);
}

void ARM9Write16(u32 addr, u16 val)
{
    switch (addr & 0xFF000000)
    {
    case 0x02000000:
        *(u16*)&MainRAM[addr & 0x3FFFFF] = val;
        return;
    }

    printf("unknown arm9 write16 %08X %04X\n", addr, val);
}

void ARM9Write32(u32 addr, u32 val)
{
    switch (addr & 0xFF000000)
    {
    case 0x02000000:
        *(u32*)&MainRAM[addr & 0x3FFFFF] = val;
        return;
    }

    printf("unknown arm9 write32 %08X %08X\n", addr, val);
}



u8 ARM7Read8(u32 addr)
{
    if (addr < 0x00004000)
    {
        return *(u8*)&ARM7BIOS[addr];
    }

    switch (addr & 0xFF800000)
    {
    case 0x02000000:
        return *(u8*)&MainRAM[addr & 0x3FFFFF];

    case 0x03800000:
        return *(u8*)&ARM7WRAM[addr & 0xFFFF];
    }

    printf("unknown arm7 read8 %08X\n", addr);
    return 0;
}

u16 ARM7Read16(u32 addr)
{
    if (addr < 0x00004000)
    {
        return *(u16*)&ARM7BIOS[addr];
    }

    switch (addr & 0xFF800000)
    {
    case 0x02000000:
        return *(u16*)&MainRAM[addr & 0x3FFFFF];

    case 0x03800000:
        return *(u16*)&ARM7WRAM[addr & 0xFFFF];
    }

    printf("unknown arm7 read16 %08X\n", addr);
    return 0;
}

u32 ARM7Read32(u32 addr)
{
    if (addr < 0x00004000)
    {
        return *(u32*)&ARM7BIOS[addr];
    }

    switch (addr & 0xFF800000)
    {
    case 0x02000000:
        return *(u32*)&MainRAM[addr & 0x3FFFFF];

    case 0x03800000:
        return *(u32*)&ARM7WRAM[addr & 0xFFFF];
    }

    printf("unknown arm7 read32 %08X\n", addr);
    return 0;
}

void ARM7Write8(u32 addr, u8 val)
{
    switch (addr & 0xFF800000)
    {
    case 0x02000000:
        *(u8*)&MainRAM[addr & 0x3FFFFF] = val;
        return;

    case 0x03800000:
        *(u8*)&ARM7WRAM[addr & 0xFFFF] = val;
        return;
    }

    printf("unknown arm7 write8 %08X %02X\n", addr, val);
}

void ARM7Write16(u32 addr, u16 val)
{
    switch (addr & 0xFF800000)
    {
    case 0x02000000:
        *(u16*)&MainRAM[addr & 0x3FFFFF] = val;
        return;

    case 0x03800000:
        *(u16*)&ARM7WRAM[addr & 0xFFFF] = val;
        return;
    }

    printf("unknown arm7 write16 %08X %04X\n", addr, val);
}

void ARM7Write32(u32 addr, u32 val)
{
    switch (addr & 0xFF800000)
    {
    case 0x02000000:
        *(u32*)&MainRAM[addr & 0x3FFFFF] = val;
        return;

    case 0x03800000:
        *(u32*)&ARM7WRAM[addr & 0xFFFF] = val;
        return;
    }

    printf("unknown arm7 write32 %08X %08X\n", addr, val);
}

}