#define PADDR(a) (a)

/*
 * Function: int readFromExtMem(int addr)
 * Description: loads value from external memory.
 * Input: addr - address of external memory, must be aligned at 4
 * Output: int - loaded value
 */
int readFromExtMem(int addr)
{
        int val = 0;
        addr = PADDR(addr);

        asm volatile("lsrl 2, %0, r6.l"::"r"(addr));
        asm volatile("move r6.l, a5.l":::"a5.l");
        asm volatile("move (a5.l), r6.l");
        asm volatile("move r6.l, %0":"=r"(val));

        return val;
}

/*
 * Function: void writeToExtMem(int addr, int value)
 * Description: loads value into external memory.
 * Input: addr - address of external memory, must be aligned at 4
 *        value - value to store
  */
void writeToExtMem(int addr, int value)
{
        addr = PADDR(addr);

        asm volatile("lsrl 2, %0, r6.l"::"r"(addr));
        asm volatile("move r6.l, a5.l":::"a5.l");
        asm volatile("move %0, (a5.l)"::"r"(value));
}



/*
int readFromExtMem(int addr);
void writeToExtMem(int address, int value);
*/

void mmemcpy(int* s, int* d, int size)
{
        int i = 0;
        for(i=0;i<size; i++)
        {
                *s++ = *d++;
        }
}

int main()
{
        int val = 0;

        writeToExtMem(0x20004000, 0x12344321);

        val = readFromExtMem(0x20004000);

        return (val==0x12344321);
}