Change the x86 interrupt code to suspend/resume interrupt controllers

(PICs) rather than interrupt sources.  This allows interrupt controllers
with no interrupt pics (such as the 8259As when APIC is in use) to
participate in suspend/resume.
- Always register the 8259A PICs even if we don't use any of their pins.
- Explicitly reset the 8259As on resume on amd64 if 'device atpic' isn't
  included.
- Add a "dummy" PIC for the local APIC on the BSP to reset the local APIC
  on resume.  This gets suspend/resume working with APIC on UP systems.
  SMP still needs more work to bring the APs back to life.

The MFC after is tentative.

Tested by:	anholt (i386)
Submitted by:	Andrea Bittau <a.bittau at cs.ucl.ac.uk> (3)
MFC after:	1 week

1 files changed, 4 insertions, 2 deletions

diff --git a/sys/i386/include/intr_machdep.h b/sys/i386/include/intr_machdep.h
index 886811c..4884fd5 100644
--- a/sys/i386/include/intr_machdep.h
+++ b/sys/i386/include/intr_machdep.h
@@ -81,11 +81,12 @@ struct pic {
 	void (*pic_enable_intr)(struct intsrc *);
 	int (*pic_vector)(struct intsrc *);
 	int (*pic_source_pending)(struct intsrc *);
-	void (*pic_suspend)(struct intsrc *);
-	void (*pic_resume)(struct intsrc *);
+	void (*pic_suspend)(struct pic *);
+	void (*pic_resume)(struct pic *);
 	int (*pic_config_intr)(struct intsrc *, enum intr_trigger,
 	    enum intr_polarity);
 	void (*pic_assign_cpu)(struct intsrc *, u_int apic_id);
+	STAILQ_ENTRY(pic) pics;
 };
 
 /* Flags for pic_disable_source() */
@@ -130,6 +131,7 @@ int	intr_config_intr(int vector, enum intr_trigger trig,
     enum intr_polarity pol);
 void	intr_execute_handlers(struct intsrc *isrc, struct trapframe *frame);
 struct intsrc *intr_lookup_source(int vector);
+int	intr_register_pic(struct pic *pic);
 int	intr_register_source(struct intsrc *isrc);
 int	intr_remove_handler(void *cookie);
 void	intr_resume(void);