patch-2.1.53 linux/include/asm-ppc/hardirq.h

• Lines: 48
• Date: Thu Sep 4 12:54:49 1997
• Orig file: v2.1.52/linux/include/asm-ppc/hardirq.h
• Orig date: Mon Aug 4 16:25:39 1997

diff -u --recursive --new-file v2.1.52/linux/include/asm-ppc/hardirq.h linux/include/asm-ppc/hardirq.h
@@ -14,10 +14,45 @@
 
 #define synchronize_irq()	do { } while (0)
 
-#else
+#else /* __SMP__ */
 
-#error Somebody should do SMP support for PPC...
+extern unsigned char global_irq_holder;
+extern spinlock_t global_irq_lock;
+extern atomic_t global_irq_count;
 
+#define release_irqlock(cpu)				\
+do {	if(global_irq_holder == (unsigned char) cpu) {	\
+		global_irq_holder = NO_PROC_ID;		\
+		spin_unlock(&global_irq_lock);		\
+	}						\
+} while(0)
+
+/* Ordering of the counter bumps is _deadly_ important. */
+#define hardirq_enter(cpu) \
+	do { ++local_irq_count[cpu]; atomic_inc(&global_irq_count); } while(0)
+
+#define hardirq_exit(cpu) \
+	do { atomic_dec(&global_irq_count); --local_irq_count[cpu]; } while(0)
+
+#define hardirq_trylock(cpu)					\
+({	unsigned long flags; int ret = 1;			\
+	__save_flags(flags);					\
+	__cli();						\
+	if(atomic_add_return(1, &global_irq_count) != 1 ||	\
+	   *(((unsigned char *)(&global_irq_lock)))) {		\
+		atomic_dec(&global_irq_count);			\
+		__restore_flags(flags);				\
+		ret = 0;					\
+	} else {						\
+		++local_irq_count[cpu];				\
+		__sti();					\
+	}							\
+	ret;							\
+})
+
+#define hardirq_endlock(cpu) do { __cli(); hardirq_exit(cpu); __sti(); } while(0)
+
+extern void synchronize_irq(void);
 #endif /* __SMP__ */
 
 #endif /* __ASM_HARDIRQ_H */