interrupts: execute pending interrupts

kernel-src/include/kernel/interrupt.h

@@ -19,6 +19,8 @@
 
 struct _isr_t;
 typedef struct _isr_t {
+	struct _isr_t *next;
+	struct _isr_t *prev;
 	void (*func)(struct _isr_t *self, context_t *ctx);
 	void (*eoi)(struct _isr_t *self);
 	long id;

kernel-src/include/x86-64/arch/cpu.h

@@ -25,6 +25,7 @@ typedef struct cpu_t {
 	thread_t *idlethread;
 	timerentry_t schedtimerentry;
 	void *schedulerstack;
+	isr_t *isrqueue;
 } cpu_t;
 
 #define CPU_HALT() asm volatile("hlt")