project64/Source/Android/PluginRSP/cicx105.cpp

// Project64 - A Nintendo 64 emulator
// http://www.pj64-emu.com/
// Copyright(C) 2001-2021 Project64
// Copyright(C) 2012 Bobby Smiles
// Copyright(C) 2009 Richard Goedeken
// Copyright(C) 2002 Hacktarux
// GNU/GPLv2 licensed: https://gnu.org/licenses/gpl-2.0.html

#include "stdafx.h"
#include <string.h>

/*
During IPL3 stage of CIC x105 games, the RSP performs some checks and transactions
necessary for booting the game.

We only implement the needed DMA transactions for booting.

Found in Banjo-Tooie, Zelda, Perfect Dark, ...)
*/

void cicx105_ucode(CHle * hle)
{
    // memcpy is okay to use because access constraints are met (alignment, size)
    unsigned int i;
    unsigned char *dst = hle->dram() + 0x2fb1f0;
    unsigned char *src = hle->imem() + 0x120;

    // dma_read(0x1120, 0x1e8, 0x1e8)
    memcpy(hle->imem() + 0x120, hle->dram() + 0x1e8, 0x1f0);

    // dma_write(0x1120, 0x2fb1f0, 0xfe817000)
    for (i = 0; i < 24; ++i)
    {
        memcpy(dst, src, 8);
        dst += 0xff0;
        src += 0x8;
    }
}