2 files changed, 27 insertions, 0 deletions

diff --git a/arch/x86/kernel/i8259.c b/arch/x86/kernel/i8259.c
index dc92b49d9204..4b8a53d841f7 100644
--- a/arch/x86/kernel/i8259.c
+++ b/arch/x86/kernel/i8259.c
@@ -282,6 +282,30 @@ static int __init i8259A_init_sysfs(void)
 
 device_initcall(i8259A_init_sysfs);
 
+void mask_8259A(void)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&i8259A_lock, flags);
+
+        outb(0xff, PIC_MASTER_IMR);     /* mask all of 8259A-1 */
+        outb(0xff, PIC_SLAVE_IMR);      /* mask all of 8259A-2 */
+
+        spin_unlock_irqrestore(&i8259A_lock, flags);
+}
+
+void unmask_8259A(void)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&i8259A_lock, flags);
+
+        outb(cached_master_mask, PIC_MASTER_IMR); /* restore master IRQ mask */
+        outb(cached_slave_mask, PIC_SLAVE_IMR);   /* restore slave IRQ mask */
+
+        spin_unlock_irqrestore(&i8259A_lock, flags);
+}
+
 void init_8259A(int auto_eoi)
 {
         unsigned long flags;
diff --git a/include/asm-x86/i8259.h b/include/asm-x86/i8259.h
index 2f98df91f1f2..31112b6c595b 100644
--- a/include/asm-x86/i8259.h
+++ b/include/asm-x86/i8259.h
@@ -57,4 +57,7 @@ static inline void outb_pic(unsigned char value, unsigned int port)
 
 extern struct irq_chip i8259A_chip;
 
+extern void mask_8259A(void);
+extern void unmask_8259A(void);
+
 #endif  /* __ASM_I8259_H__ */