patch-2.4.20 linux-2.4.20/include/asm-x86_64/hardirq.h

• Lines: 92
• Date: Thu Nov 28 15:53:15 2002
• Orig file: linux-2.4.19/include/asm-x86_64/hardirq.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/include/asm-x86_64/hardirq.h linux-2.4.20/include/asm-x86_64/hardirq.h
@@ -0,0 +1,91 @@
+#ifndef __ASM_HARDIRQ_H
+#define __ASM_HARDIRQ_H
+
+#include <linux/config.h>
+#include <linux/threads.h>
+#include <linux/irq.h>
+
+/* assembly code in softirq.h is sensitive to the offsets of these fields */
+typedef struct {
+	unsigned int __softirq_pending;
+	unsigned int __local_irq_count;
+	unsigned int __local_bh_count;
+	unsigned int __syscall_count;
+	struct task_struct * __ksoftirqd_task; /* waitqueue is too large */
+	unsigned int __nmi_count;	/* arch dependent */
+} ____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() (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 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 <asm/smp.h>
+
+extern unsigned char global_irq_holder;
+extern unsigned volatile long global_irq_lock; /* long for set_bit -RR */
+
+static inline int irqs_running (void)
+{
+	int i;
+
+	for (i = 0; i < smp_num_cpus; i++)
+		if (local_irq_count(i))
+			return 1;
+	return 0;
+}
+
+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;
+		clear_bit(0,&global_irq_lock);
+	}
+}
+
+static inline void irq_enter(int cpu, int irq)
+{
+	++local_irq_count(cpu);
+
+	while (test_bit(0,&global_irq_lock)) {
+		cpu_relax();
+	}
+}
+
+static inline void irq_exit(int cpu, int irq)
+{
+	--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)	do { } while (0)
+
+extern void synchronize_irq(void);
+
+#endif /* CONFIG_SMP */
+
+#endif /* __ASM_HARDIRQ_H */