Changeset 7bcfbbc in mainline for kernel/arch/ppc32/src/interrupt.c

Timestamp:

2007-04-07T23:30:59Z (18 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

ac88c93

Parents:

7e58979

Message:

support the possibility to send EOI or Interrupt Acknowledgement
prior to processing the interrupt
(this is essential on some architectures to prevent preemption deadlock)

File:

• kernel/arch/ppc32/src/interrupt.c (modified) (3 diffs)

kernel/arch/ppc32/src/interrupt.c

@@ -61 +61 @@
         
         while ((inum = pic_get_pending()) != -1) {
+                bool ack = false;
                 irq_t *irq = irq_dispatch_and_lock(inum);
                 if (irq) {
@@ -66 +67 @@
                          * The IRQ handler was found.
                          */
+                        
+                        if (irq->preack) {
+                                /* Acknowledge the interrupt before processing */
+                                pic_ack_interrupt(inum);
+                                ack = true;
+                        }
+                        
                         irq->handler(irq, irq->arg);
                         spinlock_unlock(&irq->lock);
@@ -76 +84 @@
 #endif
                 }
-                pic_ack_interrupt(inum);
+                
+                if (!ack)
+                        pic_ack_interrupt(inum);
         }
 }