/*
*   emunand.c
*       by Reisyukaku
*   Copyright (c) 2015 All Rights Reserved
*/

#include "emunand.h"
#include "memory.h"
#include "fatfs/sdmmc/sdmmc.h"

void getEmunandSect(u32 *off, u32 *head){
    u8 *const temp = (u8 *)0x24300000;

    u32 nandSize = getMMCDevice(0)->total_size;
    if(sdmmc_sdcard_readsectors(nandSize, 1, temp) == 0){
        if(*(u32 *)(temp + 0x100) == NCSD_MAGIC){
            *off = 0;
            *head = nandSize;
        }
    }
}

void getSDMMC(void *pos, u32 *off, u32 size){
    //Look for struct code
    const unsigned char pattern[] = {0x21, 0x20, 0x18, 0x20};
    *off = (u32)memsearch(pos, pattern, size, 4) - 1;
    
    //Get DCD values
    u8 buf[4];
    u32 addr = 0,
        additive = 0,
        p;
    memcpy(buf, (void *)(*off+0x0A), 4);
    for (p = 0; p < 4; p++) addr |= ((u32) buf[p]) << (8 * p);
    memcpy(buf, (void *)(*off+0x0E), 4);
    for (p = 0; p < 4; p++) additive |= ((u32) buf[p]) << (8 * p);
    
    //Return result
    *off = addr + additive;
}

void getEmuRW(void *pos, u32 size, u32 *readOff, u32 *writeOff){
    //Look for read/write code
    const unsigned char pattern[] = {0x1E, 0x00, 0xC8, 0x05};

    *writeOff = (u32)memsearch(pos, pattern, size, 4) - 6;
    *readOff = (u32)memsearch((void *)(*writeOff - 0x1000), pattern, 0x1000, 4) - 6;
}

void getMPU(void *pos, u32 *off, u32 size){
    //Look for MPU pattern
    const unsigned char pattern[] = {0x03, 0x00, 0x24, 0x00};

    *off = (u32)memsearch(pos, pattern, size, 4);
}