x86: Provide access to the IDT

Add a function to return the address of the Interrupt Descriptor Table.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/cpu/interrupts.c

@@ -147,6 +147,11 @@ int cpu_init_interrupts(void)
 	return 0;
 }
 
+void *x86_get_idt(void)
+{
+	return &idt_ptr;
+}
+
 void __do_irq(int irq)
 {
 	printf("Unhandled IRQ : %d\n", irq);

arch/x86/include/asm/interrupt.h

@@ -38,4 +38,6 @@ extern char exception_stack[];
  */
 void configure_irq_trigger(int int_num, bool is_level_triggered);
 
+void *x86_get_idt(void);
+
 #endif