Ejemplo n.º 1
0
fastcall void irq_handler(pt_regs_t *regs) {
	assert(!critical_inside(CRITICAL_IRQ_LOCK));

	critical_enter(CRITICAL_IRQ_HANDLER);
	{
		int irq = regs->trapno - 0x20;

		ipl_enable();

		irq_dispatch(irq);

		/* next lines ordered this way thats why.
 		 * On eoi current irq unmasked and may occur again right there,
		 * on irq stack. It may repeat till stack exhaustion.
		 * Disabling ipl first prevents irq handling of same or lower
		 * level till switched to lower critical level.
		 */

		ipl_disable();

		irqctrl_eoi(irq);

	}
	critical_leave(CRITICAL_IRQ_HANDLER);
	critical_dispatch_pending();
}
Ejemplo n.º 2
0
void __attribute__ ((noreturn)) arch_shutdown(arch_shutdown_mode_t mode) {

	switch (mode) {
	case ARCH_SHUTDOWN_MODE_HALT:
		acpi_shutdown();
		break;

	case ARCH_SHUTDOWN_MODE_REBOOT:

		/*
		 * There are several ways to reboot a computer. Unfortunately, none of
		 * them will work on all machines. We try to use three methods:
		 * 1. using ACPI;
		 * 2. via the keyboard controller;
		 * 3. generating a triple fault.
		 * You can read more at
		 * http://mjg59.dreamwidth.org/3561.html
		 */
		acpi_reset();
		arch_reset_kbd();
		cpu_triple_reset();

		break;

	case ARCH_SHUTDOWN_MODE_ABORT:
		break;
	}

	ipl_disable();

	while (1) {}
}
Ejemplo n.º 3
0
void interrupt_handle(void) {
	unsigned int irq = REG_LOAD(GICC_IAR);
	if (irq == SPURIOUS_IRQ)
		return;

	/* TODO check if IRQ number is correct */

	assert(!critical_inside(CRITICAL_IRQ_LOCK));

	irqctrl_disable(irq);
	irqctrl_eoi(irq);
	critical_enter(CRITICAL_IRQ_HANDLER);
	{
		ipl_enable();

		irq_dispatch(irq);

		ipl_disable();

	}
	irqctrl_enable(irq);
	critical_leave(CRITICAL_IRQ_HANDLER);
	critical_dispatch_pending();
}