patch-2.3.43 linux/include/asm-ia64/hardirq.h

• Lines: 77
• Date: Tue Feb 8 12:01:59 2000
• Orig file: v2.3.42/linux/include/asm-ia64/hardirq.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.42/linux/include/asm-ia64/hardirq.h linux/include/asm-ia64/hardirq.h
@@ -0,0 +1,76 @@
+#ifndef _ASM_IA64_HARDIRQ_H
+#define _ASM_IA64_HARDIRQ_H
+
+/*
+ * Copyright (C) 1998, 1999 Hewlett-Packard Co
+ * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+
+#include <linux/config.h>
+#include <linux/threads.h>
+
+extern unsigned int local_irq_count[NR_CPUS];
+extern unsigned long hardirq_no[NR_CPUS];
+
+/*
+ * Are we in an interrupt context? Either doing bottom half
+ * or hardware interrupt processing?
+ */
+
+#define in_interrupt()						\
+({								\
+	int __cpu = smp_processor_id();				\
+	(local_irq_count[__cpu] + local_bh_count[__cpu]) != 0;	\
+})
+
+#ifndef CONFIG_SMP
+# define hardirq_trylock(cpu)		(local_irq_count[cpu] == 0)
+# define hardirq_endlock(cpu)		((void) 0)
+
+# define hardirq_enter(cpu, irq)	(local_irq_count[cpu]++)
+# define hardirq_exit(cpu, irq)		(local_irq_count[cpu]--)
+
+# define synchronize_irq()		barrier()
+#else
+
+#include <linux/spinlock.h>
+
+#include <asm/atomic.h>
+#include <asm/smp.h>
+
+extern int global_irq_holder;
+extern spinlock_t global_irq_lock;
+extern atomic_t global_irq_count;
+
+static inline void release_irqlock(int cpu)
+{
+	/* if we didn't own the irq lock, just ignore.. */
+	if (global_irq_holder == cpu) {
+		global_irq_holder = NO_PROC_ID;
+		spin_unlock(&global_irq_lock);
+        }
+}
+
+static inline void hardirq_enter(int cpu, int irq)
+{
+	++local_irq_count[cpu];
+        atomic_inc(&global_irq_count);
+}
+
+static inline void hardirq_exit(int cpu, int irq)
+{
+	atomic_dec(&global_irq_count);
+        --local_irq_count[cpu];
+}
+
+static inline int hardirq_trylock(int cpu)
+{
+	return !local_irq_count[cpu] && !test_bit(0,&global_irq_lock);
+}
+
+#define hardirq_endlock(cpu)  ((void)0)
+
+extern void synchronize_irq(void);
+
+#endif /* CONFIG_SMP */
+#endif /* _ASM_IA64_HARDIRQ_H */