patch-2.3.99-pre8 linux/include/asm-s390/hardirq.h

• Lines: 79
• Date: Fri May 12 11:41:44 2000
• Orig file: v2.3.99-pre7/linux/include/asm-s390/hardirq.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre7/linux/include/asm-s390/hardirq.h linux/include/asm-s390/hardirq.h
@@ -0,0 +1,78 @@
+/*
+ *  include/asm-s390/hardirq.h
+ *
+ *  S390 version
+ *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
+ *               Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
+ *
+ *  Derived from "include/asm-i386/hardirq.h"
+ */
+
+#ifndef __ASM_HARDIRQ_H
+#define __ASM_HARDIRQ_H
+
+#include <linux/config.h>
+#include <linux/threads.h>
+#include <asm/lowcore.h>
+#include <linux/sched.h>
+/*
+ * Are we in an interrupt context? Either doing bottom half
+ * or hardware interrupt processing?
+ */
+#define in_interrupt() ((atomic_read(&S390_lowcore.local_irq_count) + atomic_read(&S390_lowcore.local_bh_count)) != 0)
+
+#define in_irq() (atomic_read(&S390_lowcore.local_irq_count) != 0)
+
+#ifndef CONFIG_SMP
+
+#define hardirq_trylock(cpu)	(atomic_read(&S390_lowcore.local_irq_count) == 0)
+#define hardirq_endlock(cpu)	do { } while (0)
+
+#define hardirq_enter(cpu)	(atomic_inc(&S390_lowcore.local_irq_count))
+#define hardirq_exit(cpu)	(atomic_dec(&S390_lowcore.local_irq_count))
+
+#define synchronize_irq()	do { } while (0)
+
+#else
+
+#include <asm/atomic.h>
+#include <asm/smp.h>
+
+extern atomic_t global_irq_holder;
+extern atomic_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 (atomic_read(&global_irq_holder) ==  cpu) {
+		atomic_set(&global_irq_holder,NO_PROC_ID);
+		clear_bit(0,&global_irq_lock);
+	}
+}
+
+static inline void hardirq_enter(int cpu)
+{
+        atomic_inc(&safe_get_cpu_lowcore(cpu).local_irq_count);
+	atomic_inc(&global_irq_count);
+}
+
+static inline void hardirq_exit(int cpu)
+{
+	atomic_dec(&global_irq_count);
+        atomic_dec(&safe_get_cpu_lowcore(cpu).local_irq_count);
+}
+
+static inline int hardirq_trylock(int cpu)
+{
+	return !atomic_read(&global_irq_count) && !test_bit(0,&global_irq_lock);
+}
+
+#define hardirq_endlock(cpu)	do { } while (0)
+
+extern void synchronize_irq(void);
+
+#endif /* CONFIG_SMP */
+
+#endif /* __ASM_HARDIRQ_H */