src/target/firmware/calypso/arm.c


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/* enable IRQ+FIQ interrupts */
void arm_enable_interrupts (void)
{
	unsigned long temp;
	__asm__ __volatile__("mrs %0, cpsr\n"
			     "bic %0, %0, #0xc0\n"
			     "msr cpsr_c, %0"
			     : "=r" (temp)
			     :
			     : "memory");
}

/* disable IRQ/FIQ interrupts
 * returns true if interrupts had been enabled before we disabled them */
int arm_disable_interrupts(void)
{
	unsigned long old,temp;
	__asm__ __volatile__("mrs %0, cpsr\n"
			     "orr %1, %0, #0xc0\n"
			     "msr cpsr_c, %1"
			     : "=r" (old), "=r" (temp)
			     :
			     : "memory");
	return (old & 0x80) == 0;
}