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#define IO_GPR                  (*(volatile unsigned int *)(0x8A000000))

#define REG_CPU_CONTROL         (*(volatile unsigned int *)(0x40000000))

#define REG_CPU_PC              (*(volatile unsigned int *)(0x40000004))

#define REG_CPU_A31             (*(volatile unsigned int *)(0x40000008))

#define REG_DBG_A31             (*(volatile unsigned int *)(0x4000000C))

#define REG_INTC_CONTROL        (*(volatile unsigned int *)(0x40000010))

#define REG_INTC_MASK           (*(volatile unsigned int *)(0x40000014))

#define REG_INTC_REQ            (*(volatile unsigned int *)(0x40000018))

#define REG_MEM_SIZE_KB         (*(volatile unsigned int *)(0x4000001C))

#define REG_DMA_CONTROL         (*(volatile unsigned int *)(0x40000020))

#define REG_DMA_SOURCEADDR      (*(volatile unsigned int *)(0x40000024))

#define REG_DMA_DESTADDR        (*(volatile unsigned int *)(0x40000028))

#define REG_DMA_SIZE            (*(volatile unsigned int *)(0x4000002C))

#define REG_SGI                 (*(volatile unsigned int *)(0x40000030))

#define REG_BUS_ERROR_ADDR      (*(volatile unsigned int *)(0x40000038))

#define REG_BUS_ERROR_PC        (*(volatile unsigned int *)(0x4000003C))

#define REG_TRAP_CONTROL        (*(volatile unsigned int *)(0x40000040))

#define REG_TRAP_ADDR           (*(volatile unsigned int *)(0x40000044))

#define REG_INTC_CONTROL        (*(volatile unsigned int *)(0x40000010))

#define REG_INTC_MASK           (*(volatile unsigned int *)(0x40000014))

#define REG_INTC_REQ            (*(volatile unsigned int *)(0x40000018))

void _zpu_interrupt(void)

{

        IO_GPR = 0x123455AA;

    REG_INTC_REQ = 0xFF;                // deasserting requests

    while (1) {}

}

int recursive_count(int counter)

{

    int i;

    for (i = 0; i < 100000; i++) {}

    counter++;

    IO_GPR = counter;

    if (counter == 10000) return counter;

    else recursive_count(counter);

}

int main()

{

    int counter;

    counter = 0;

    REG_TRAP_ADDR = 0x00001800;

    REG_TRAP_CONTROL = 0x01;

    REG_INTC_MASK = 0xFF;

    REG_INTC_CONTROL = 0x01;        // enabling IE

    IO_GPR = recursive_count(counter);

    while (1) {}

}