Linux kernel mirror (for testing)
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linux
1#ifndef __irq_h
2#define __irq_h
3
4/*
5 * Please do not include this file in generic code. There is currently
6 * no requirement for any architecture to implement anything held
7 * within this file.
8 *
9 * Thanks. --rmk
10 */
11
12#include <linux/config.h>
13
14#if !defined(CONFIG_ARCH_S390)
15
16#include <linux/linkage.h>
17#include <linux/cache.h>
18#include <linux/spinlock.h>
19#include <linux/cpumask.h>
20
21#include <asm/irq.h>
22#include <asm/ptrace.h>
23
24/*
25 * IRQ line status.
26 */
27#define IRQ_INPROGRESS 1 /* IRQ handler active - do not enter! */
28#define IRQ_DISABLED 2 /* IRQ disabled - do not enter! */
29#define IRQ_PENDING 4 /* IRQ pending - replay on enable */
30#define IRQ_REPLAY 8 /* IRQ has been replayed but not acked yet */
31#define IRQ_AUTODETECT 16 /* IRQ is being autodetected */
32#define IRQ_WAITING 32 /* IRQ not yet seen - for autodetection */
33#define IRQ_LEVEL 64 /* IRQ level triggered */
34#define IRQ_MASKED 128 /* IRQ masked - shouldn't be seen again */
35#define IRQ_PER_CPU 256 /* IRQ is per CPU */
36
37/*
38 * Interrupt controller descriptor. This is all we need
39 * to describe about the low-level hardware.
40 */
41struct hw_interrupt_type {
42 const char * typename;
43 unsigned int (*startup)(unsigned int irq);
44 void (*shutdown)(unsigned int irq);
45 void (*enable)(unsigned int irq);
46 void (*disable)(unsigned int irq);
47 void (*ack)(unsigned int irq);
48 void (*end)(unsigned int irq);
49 void (*set_affinity)(unsigned int irq, cpumask_t dest);
50 /* Currently used only by UML, might disappear one day.*/
51#ifdef CONFIG_IRQ_RELEASE_METHOD
52 void (*release)(unsigned int irq, void *dev_id);
53#endif
54};
55
56typedef struct hw_interrupt_type hw_irq_controller;
57
58/*
59 * This is the "IRQ descriptor", which contains various information
60 * about the irq, including what kind of hardware handling it has,
61 * whether it is disabled etc etc.
62 *
63 * Pad this out to 32 bytes for cache and indexing reasons.
64 */
65typedef struct irq_desc {
66 hw_irq_controller *handler;
67 void *handler_data;
68 struct irqaction *action; /* IRQ action list */
69 unsigned int status; /* IRQ status */
70 unsigned int depth; /* nested irq disables */
71 unsigned int irq_count; /* For detecting broken interrupts */
72 unsigned int irqs_unhandled;
73 spinlock_t lock;
74} ____cacheline_aligned irq_desc_t;
75
76extern irq_desc_t irq_desc [NR_IRQS];
77
78#include <asm/hw_irq.h> /* the arch dependent stuff */
79
80extern int setup_irq(unsigned int irq, struct irqaction * new);
81
82#ifdef CONFIG_GENERIC_HARDIRQS
83extern cpumask_t irq_affinity[NR_IRQS];
84extern int no_irq_affinity;
85extern int noirqdebug_setup(char *str);
86
87extern fastcall int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
88 struct irqaction *action);
89extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
90extern void note_interrupt(unsigned int irq, irq_desc_t *desc,
91 int action_ret, struct pt_regs *regs);
92extern int can_request_irq(unsigned int irq, unsigned long irqflags);
93
94extern void init_irq_proc(void);
95#endif
96
97extern hw_irq_controller no_irq_type; /* needed in every arch ? */
98
99#endif
100
101#endif /* __irq_h */