patch-2.4.19 linux-2.4.19/include/asm-ppc64/hardirq.h

• Lines: 101
• Date: Fri Aug 2 17:39:45 2002
• Orig file: linux-2.4.18/include/asm-ppc64/hardirq.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/include/asm-ppc64/hardirq.h linux-2.4.19/include/asm-ppc64/hardirq.h
@@ -0,0 +1,100 @@
+#ifdef __KERNEL__
+#ifndef __ASM_HARDIRQ_H
+#define __ASM_HARDIRQ_H
+
+/*
+ * Use a brlock for the global irq lock, based on sparc64.
+ * Anton Blanchard <anton@au1.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/brlock.h>
+#include <linux/spinlock.h>
+
+
+typedef struct {
+	unsigned long __softirq_pending;
+#ifndef CONFIG_SMP
+	unsigned int __local_irq_count;
+#else
+	unsigned int __unused_on_SMP;		/* We use brlocks on SMP */
+#endif
+	unsigned int __local_bh_count;
+	unsigned int __syscall_count;
+	unsigned long __unused;
+	struct task_struct * __ksoftirqd_task;
+} ____cacheline_aligned irq_cpustat_t;
+
+#include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */
+/* Note that local_irq_count() is replaced by ppc64 specific version for SMP */
+
+#ifndef CONFIG_SMP
+#define irq_enter(cpu)		(local_irq_count(cpu)++)
+#define irq_exit(cpu)		(local_irq_count(cpu)--)
+#else
+#undef local_irq_count
+#define local_irq_count(cpu)	(__brlock_array[cpu][BR_GLOBALIRQ_LOCK])
+#define irq_enter(cpu)		br_read_lock(BR_GLOBALIRQ_LOCK)
+#define irq_exit(cpu)		br_read_unlock(BR_GLOBALIRQ_LOCK)
+#endif
+
+/*
+ * 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); })
+
+/* This tests only the local processors hw IRQ context disposition.  */
+#define in_irq() (local_irq_count(smp_processor_id()) != 0)
+
+#ifndef CONFIG_SMP
+
+#define hardirq_trylock(cpu)	(local_irq_count(cpu) == 0)
+#define hardirq_endlock(cpu)	do { } while (0)
+
+#define synchronize_irq()	barrier()
+
+#else /* CONFIG_SMP */
+
+static __inline__ int irqs_running(void)
+{
+	int i;
+
+	for (i = 0; i < smp_num_cpus; i++)
+		if (local_irq_count(cpu_logical_map(i)))
+			return 1;
+	return 0;
+}
+
+extern unsigned char global_irq_holder;
+
+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;
+		br_write_unlock(BR_GLOBALIRQ_LOCK);
+	}
+}
+
+static inline int hardirq_trylock(int cpu)
+{
+	spinlock_t *lock = &__br_write_locks[BR_GLOBALIRQ_LOCK].lock;
+
+	return (!local_irq_count(cpu) && !spin_is_locked(lock));
+}
+
+#define hardirq_endlock(cpu)    do { (void)(cpu); } while (0)
+
+extern void synchronize_irq(void);
+
+#endif /* CONFIG_SMP */
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_HARDIRQ_H */