116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
#ifdef __KERNEL__
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#ifndef _ASM_IRQ_H
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#define _ASM_IRQ_H
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/threads.h>
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/*
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* Maximum number of interrupt sources that we can handle.
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*/
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#define NR_IRQS 512
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/* this number is used when no interrupt has been assigned */
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#define NO_IRQ (-1)
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/*
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* These constants are used for passing information about interrupt
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* signal polarity and level/edge sensing to the low-level PIC chip
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* drivers.
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*/
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#define IRQ_SENSE_MASK 0x1
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#define IRQ_SENSE_LEVEL 0x1 /* interrupt on active level */
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#define IRQ_SENSE_EDGE 0x0 /* interrupt triggered by edge */
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#define IRQ_POLARITY_MASK 0x2
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#define IRQ_POLARITY_POSITIVE 0x2 /* high level or low->high edge */
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#define IRQ_POLARITY_NEGATIVE 0x0 /* low level or high->low edge */
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#define get_irq_desc(irq) (&irq_desc[(irq)])
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/* Define a way to iterate across irqs. */
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#define for_each_irq(i) \
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for ((i) = 0; (i) < NR_IRQS; ++(i))
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/* Interrupt numbers are virtual in case they are sparsely
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* distributed by the hardware.
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*/
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extern unsigned int virt_irq_to_real_map[NR_IRQS];
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/* Create a mapping for a real_irq if it doesn't already exist.
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* Return the virtual irq as a convenience.
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*/
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int virt_irq_create_mapping(unsigned int real_irq);
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void virt_irq_init(void);
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static inline unsigned int virt_irq_to_real(unsigned int virt_irq)
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{
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return virt_irq_to_real_map[virt_irq];
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}
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extern unsigned int real_irq_to_virt_slowpath(unsigned int real_irq);
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/*
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* Because many systems have two overlapping names spaces for
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* interrupts (ISA and XICS for example), and the ISA interrupts
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* have historically not been easy to renumber, we allow ISA
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* interrupts to take values 0 - 15, and shift up the remaining
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* interrupts by 0x10.
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*/
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#define NUM_ISA_INTERRUPTS 0x10
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extern int __irq_offset_value;
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static inline int irq_offset_up(int irq)
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{
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return(irq + __irq_offset_value);
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}
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static inline int irq_offset_down(int irq)
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{
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return(irq - __irq_offset_value);
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}
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static inline int irq_offset_value(void)
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{
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return __irq_offset_value;
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}
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static __inline__ int irq_canonicalize(int irq)
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{
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return irq;
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}
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extern int distribute_irqs;
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struct irqaction;
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struct pt_regs;
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#ifdef CONFIG_IRQSTACKS
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/*
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* Per-cpu stacks for handling hard and soft interrupts.
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*/
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extern struct thread_info *hardirq_ctx[NR_CPUS];
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extern struct thread_info *softirq_ctx[NR_CPUS];
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extern void irq_ctx_init(void);
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extern void call_do_softirq(struct thread_info *tp);
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extern int call_handle_IRQ_event(int irq, struct pt_regs *regs,
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struct irqaction *action, struct thread_info *tp);
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#define __ARCH_HAS_DO_SOFTIRQ
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#else
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#define irq_ctx_init()
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#endif /* CONFIG_IRQSTACKS */
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#endif /* _ASM_IRQ_H */
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#endif /* __KERNEL__ */
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