1 files changed, 8 insertions, 14 deletions

diff --git a/arch/x86/kernel/i8259.c b/arch/x86/kernel/i8259.c
index 7a0fda8f01b5..dc92b49d9204 100644
--- a/arch/x86/kernel/i8259.c
+++ b/arch/x86/kernel/i8259.c
@@ -297,34 +297,28 @@ void init_8259A(int auto_eoi)
          * outb_pic - this has to work on a wide range of PC hardware.
          */
         outb_pic(0x11, PIC_MASTER_CMD); /* ICW1: select 8259A-1 init */
-#ifndef CONFIG_X86_64
-        outb_pic(0x20 + 0, PIC_MASTER_IMR);     /* ICW2: 8259A-1 IR0-7 mapped to 0x20-0x27 */
-        outb_pic(1U << PIC_CASCADE_IR, PIC_MASTER_IMR); /* 8259A-1 (the master) has a slave on IR2 */
-#else /* CONFIG_X86_64 */
-        /* ICW2: 8259A-1 IR0-7 mapped to 0x30-0x37 */
+
+        /* ICW2: 8259A-1 IR0-7 mapped to 0x30-0x37 on x86-64,
+                               to 0x20-0x27 on i386 */
         outb_pic(IRQ0_VECTOR, PIC_MASTER_IMR);
+
         /* 8259A-1 (the master) has a slave on IR2 */
-        outb_pic(0x04, PIC_MASTER_IMR);
-#endif /* CONFIG_X86_64 */
+        outb_pic(1U << PIC_CASCADE_IR, PIC_MASTER_IMR);
+
         if (auto_eoi)   /* master does Auto EOI */
                 outb_pic(MASTER_ICW4_DEFAULT | PIC_ICW4_AEOI, PIC_MASTER_IMR);
         else            /* master expects normal EOI */
                 outb_pic(MASTER_ICW4_DEFAULT, PIC_MASTER_IMR);
 
         outb_pic(0x11, PIC_SLAVE_CMD);  /* ICW1: select 8259A-2 init */
-#ifndef CONFIG_X86_64
-        outb_pic(0x20 + 8, PIC_SLAVE_IMR);      /* ICW2: 8259A-2 IR0-7 mapped to 0x28-0x2f */
-        outb_pic(PIC_CASCADE_IR, PIC_SLAVE_IMR);        /* 8259A-2 is a slave on master's IR2 */
-        outb_pic(SLAVE_ICW4_DEFAULT, PIC_SLAVE_IMR); /* (slave's support for AEOI in flat mode is to be investigated) */
-#else /* CONFIG_X86_64 */
-        /* ICW2: 8259A-2 IR0-7 mapped to 0x38-0x3f */
+
+        /* ICW2: 8259A-2 IR0-7 mapped to IRQ8_VECTOR */
         outb_pic(IRQ8_VECTOR, PIC_SLAVE_IMR);
         /* 8259A-2 is a slave on master's IR2 */
         outb_pic(PIC_CASCADE_IR, PIC_SLAVE_IMR);
         /* (slave's support for AEOI in flat mode is to be investigated) */
         outb_pic(SLAVE_ICW4_DEFAULT, PIC_SLAVE_IMR);
 
-#endif /* CONFIG_X86_64 */
         if (auto_eoi)
                 /*
                  * In AEOI mode we just have to mask the interrupt