S3C2440 Interrupt problem

void uart_init(void);
void uart_transmit(void);
void uart_interrupt_init(void);
void dely(U32 tt);
static void __irq Uart0RxInt(void);

char data,flag=0;

static void __irq Uart0RxInt(void)
{ INTSUBMSK = 0xFFFFFFFF; SUBSRCPND = 0x1; SRCPND |= 0x10000000; INTPND = 0x10000000;

data = rURXH0;  flag = 1;

GPBDAT=0xFFFFFFFF; dely(12); GPBDAT=0x00000000; dely(12);*/

}

void dely(U32 tt)
{ U32 i; for(;tt>0;tt--) { for(i=0;i<10000;i++){} }
}

int Main(int argc, char **argv)
{ int i; U8 key; U32 mpll_val=0; int data; unsigned int k,l;

mpll_val = (92<<12)|(1<<4)|(1);

MMU_DisableICache(); MMU_DisableDCache();

GPBCON = 0x155555; GPHCON |= 0xAA; uart_init(); uart_interrupt_init(); while(1) { while(flag!=1); uart_transmit(); flag=0; } INTSUBMSK = 0xFFFFFFFF; INTMSK = 0xFFFFFFFF;

}

void uart_init(void)
{ ULCON0 |= 0x00000003; UCON0 |= 0x00000005; UMCON0 = 0x00; UFCON0 = 0x00; UBRDIV0=329; // 9600 //UBRDIV0=27; // 115200
}

void uart_interrupt_init(void)
{ pISR_UART0 = (unsigned int)Uart0RxInt; SUBSRCPND = 0x1; SRCPND = (1<<28); INTPND = (1<<28); INTSUBMSK = 0xFFFFFFFE; INTMSK = 0xEFFFFFFF;

}

void uart_transmit(void)
{ while((UTRSTAT0&0x00000002)==0); UTXH0=data;
}