patch-2.3.14 linux/include/linux/irq.h

• Lines: 80
• Date: Wed Aug 18 16:45:11 1999
• Orig file: v2.3.13/linux/include/linux/irq.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.13/linux/include/linux/irq.h linux/include/linux/irq.h
@@ -0,0 +1,79 @@
+#ifndef __irq_h
+#define __irq_h
+
+#include <asm/irq.h>
+/*
+ * IRQ line status.
+ */
+#define IRQ_INPROGRESS	1	/* IRQ handler active - do not enter! */
+#define IRQ_DISABLED	2	/* IRQ disabled - do not enter! */
+#define IRQ_PENDING	4	/* IRQ pending - replay on enable */
+#define IRQ_REPLAY	8	/* IRQ has been replayed but not acked yet */
+#define IRQ_AUTODETECT	16	/* IRQ is being autodetected */
+#define IRQ_WAITING	32	/* IRQ not yet seen - for autodetection */
+
+/*
+ * Interrupt controller descriptor. This is all we need
+ * to describe about the low-level hardware. 
+ */
+struct hw_interrupt_type {
+	const char * typename;
+	unsigned int (*startup)(unsigned int irq);
+	void (*shutdown)(unsigned int irq);
+	void (*enable)(unsigned int irq);
+	void (*disable)(unsigned int irq);
+	void (*ack)(unsigned int irq);
+	void (*end)(unsigned int irq);
+};
+
+typedef struct hw_interrupt_type  hw_irq_controller;
+
+/*
+ * This is the "IRQ descriptor", which contains various information
+ * about the irq, including what kind of hardware handling it has,
+ * whether it is disabled etc etc.
+ *
+ * Pad this out to 32 bytes for cache and indexing reasons.
+ */
+typedef struct {
+	unsigned int status;	/* IRQ status
+				  - IRQ_INPROGRESS, IRQ_DISABLED */
+	hw_irq_controller *handler;	/* never derefed in arch
+					   independent code */
+	struct irqaction *action;		/* IRQ action list */
+	unsigned int depth;			/* Disable depth for nested irq disables */
+} irq_desc_t;
+
+#include <asm/hw_irq.h> /* the arch dependent stuff */
+
+extern irq_desc_t irq_desc[NR_IRQS];
+
+extern int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
+extern spinlock_t irq_controller_lock;
+extern int setup_irq(unsigned int , struct irqaction * );
+
+#ifdef __SMP__
+
+#include <asm/atomic.h>
+
+static inline void irq_enter(int cpu, unsigned int irq)
+{
+	hardirq_enter(cpu);
+	while (test_bit(0,&global_irq_lock)) {
+		/* nothing */;
+	}
+}
+
+static inline void irq_exit(int cpu, unsigned int irq)
+{
+	hardirq_exit(cpu);
+}
+#else
+#define irq_enter(cpu, irq)	(++local_irq_count[cpu])
+#define irq_exit(cpu, irq)	(--local_irq_count[cpu])
+#endif
+
+extern hw_irq_controller no_irq_type;  /* needed in every arch ? */
+
+#endif /* __asm_h */
+