patch-2.4.0-test12 linux/include/asm-parisc/hardirq.h

• Lines: 88
• Date: Tue Dec 5 12:29:39 2000
• Orig file: v2.4.0-test11/linux/include/asm-parisc/hardirq.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test11/linux/include/asm-parisc/hardirq.h linux/include/asm-parisc/hardirq.h
@@ -0,0 +1,87 @@
+/* hardirq.h: 32-bit Sparc hard IRQ support.
+ *
+ * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1998-99 Anton Blanchard (anton@progsoc.uts.edu.au)
+ */
+
+#ifndef __PARISC_HARDIRQ_H
+#define __PARISC_HARDIRQ_H
+
+#include <linux/config.h>
+#include <linux/threads.h>
+
+typedef struct {
+	unsigned int __softirq_active;
+	unsigned int __softirq_mask;
+	unsigned int __local_irq_count;
+	unsigned int __local_bh_count;
+	unsigned int __syscall_count;
+} ____cacheline_aligned irq_cpustat_t;
+
+#include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */
+
+/*
+ * 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); })
+
+#define in_irq() ({ int __cpu = smp_processor_id(); \
+	(local_irq_count(__cpu) != 0); })
+
+#ifndef CONFIG_SMP
+
+#define hardirq_trylock(cpu)	(local_irq_count(cpu) == 0)
+#define hardirq_endlock(cpu)	do { } while (0)
+
+#define irq_enter(cpu, irq)	(local_irq_count(cpu)++)
+#define irq_exit(cpu, irq)	(local_irq_count(cpu)--)
+
+#define synchronize_irq()	barrier()
+
+#else
+
+#include <asm/atomic.h>
+#include <linux/spinlock.h>
+#include <asm/system.h>
+#include <asm/smp.h>
+
+extern unsigned char 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 == (unsigned char) cpu) {
+		global_irq_holder = NO_PROC_ID;
+		spin_unlock(&global_irq_lock);
+	}
+}
+
+static inline void irq_enter(int cpu)
+{
+	++local_irq_count(cpu);
+	atomic_inc(&global_irq_count);
+}
+
+static inline void irq_exit(int cpu)
+{
+	atomic_dec(&global_irq_count);
+	--local_irq_count(cpu);
+}
+
+static inline int hardirq_trylock(int cpu)
+{
+	return (! atomic_read(&global_irq_count) &&
+		! spin_is_locked (&global_irq_lock));
+}
+
+#define hardirq_endlock(cpu)	do { } while (0)
+
+extern void synchronize_irq(void);
+
+#endif /* CONFIG_SMP */
+
+#endif /* __PARISC_HARDIRQ_H */