Fixed few more anomalies with threaded irqs.

There is a bug that causes the sleeping irq
thread to never wake up. Investigating.

include/l4/arch/arm/exception.h

@@ -42,17 +42,20 @@ static inline void disable_irqs()
 /* Disable the irqs unconditionally, but also keep the previous state such that
  * if it was already disabled before the call, the restore call would retain
  * this state. */
-static inline void irq_local_disable_save(unsigned long *state)
+void irq_local_disable_save(unsigned long *state);
+#if 0
 {
 	unsigned long temp;
 	__asm__ __volatile__ (
 		"mrs	%0, cpsr_fc\n"
-		"orr	%1, %0, #0x80\n"
-		"msr	cpsr_fc, %1\n"
+		"orr	%2, %0, #0x80\n"
+		"msr	cpsr_fc, %2\n"
 		: "=r" (*state)
 		: "r" (*state),"r" (temp)
 	);
 }
+#endif
+
 /* Simply change it back to original state supplied in @flags. This might enable
  * or retain disabled state of the irqs for example. Useful for nested calls. */
 static inline void irq_local_restore(unsigned long state)

include/l4/arch/arm/v5/irq.h

@@ -0,0 +1,11 @@
+#ifndef __ARM_V5_IRQ_H__
+#define __ARM_V5_IRQ_H__
+
+/*
+ * Destructive atomic-read.
+ *
+ * Write 0 to byte at @location as its contents are read back.
+ */
+char l4_atomic_dest_readb(void *location);
+
+#endif

include/l4/glue/arm/message.h

@@ -73,7 +73,8 @@
 #define MR0_REGISTER		r3
 #define MR_RETURN_REGISTER	r3
 
-#define TASK_NOTIFY_MAX		8
+#define TASK_NOTIFY_SLOTS	8
+#define TASK_NOTIFY_MAXVALUE	255
 
 /* Primaries aren't used for memcopy. Those ops use this as a parameter */
 #define L4_UTCB_FULL_BUFFER_SIZE	(MR_REST * sizeof(int))
@@ -85,7 +86,7 @@ struct utcb {
 	u32 mr[MR_TOTAL];	/* MRs that are mapped to real registers */
 	u32 saved_tag;		/* Saved tag field for stacked ipcs */
 	u32 saved_sender;	/* Saved sender field for stacked ipcs */
-	u8  notify[TASK_NOTIFY_MAX]; /* Irq notification slots */
+	u8  notify[TASK_NOTIFY_SLOTS]; /* Irq notification slots */
 	u32 mr_rest[MR_REST];	/* Complete the utcb for up to 64 words */
 };
 #endif