include/asm-x86_64/hardirq.h

   1 #ifndef __ASM_HARDIRQ_H
   2 #define __ASM_HARDIRQ_H
   3
   4 #include <linux/config.h>
   5 #include <linux/threads.h>
   6 #include <linux/irq.h>
   7 #include <asm/pda.h>
   8 #include <asm/apic.h>
   9
  10 #define __ARCH_IRQ_STAT 1
  11
  12 #define local_softirq_pending() read_pda(__softirq_pending)
  13
  14 #define __ARCH_SET_SOFTIRQ_PENDING 1
  15
  16 #define set_softirq_pending(x) write_pda(__softirq_pending, (x))
  17 #define or_softirq_pending(x)  or_pda(__softirq_pending, (x))
  18
  19 /*
  20  * 'what should we do if we get a hw irq event on an illegal vector'.
  21  * each architecture has to answer this themselves.
  22  */
  23 static inline void ack_bad_irq(unsigned int irq)
  24 {
  25         printk("unexpected IRQ trap at vector %02x\n", irq);
  26 #ifdef CONFIG_X86_LOCAL_APIC
  27         /*
  28          * Currently unexpected vectors happen only on SMP and APIC.
  29          * We _must_ ack these because every local APIC has only N
  30          * irq slots per priority level, and a 'hanging, unacked' IRQ
  31          * holds up an irq slot - in excessive cases (when multiple
  32          * unexpected vectors occur) that might lock up the APIC
  33          * completely.
  34          */
  35         ack_APIC_irq();
  36 #endif
  37 }
  38 #endif /* __ASM_HARDIRQ_H */