| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifdef __KERNEL__ |
| 2 | #ifndef _ASM_IRQ_H |
| 3 | #define _ASM_IRQ_H |
| 4 | |
| 5 | /* |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/config.h> |
| 13 | #include <linux/threads.h> |
| 14 | |
| 15 | /* |
| 16 | * Maximum number of interrupt sources that we can handle. |
| 17 | */ |
| 18 | #define NR_IRQS 512 |
| 19 | |
| 20 | /* this number is used when no interrupt has been assigned */ |
| 21 | #define NO_IRQ (-1) |
| 22 | |
| 23 | /* |
| 24 | * These constants are used for passing information about interrupt |
| 25 | * signal polarity and level/edge sensing to the low-level PIC chip |
| 26 | * drivers. |
| 27 | */ |
| 28 | #define IRQ_SENSE_MASK 0x1 |
| 29 | #define IRQ_SENSE_LEVEL 0x1 /* interrupt on active level */ |
| 30 | #define IRQ_SENSE_EDGE 0x0 /* interrupt triggered by edge */ |
| 31 | |
| 32 | #define IRQ_POLARITY_MASK 0x2 |
| 33 | #define IRQ_POLARITY_POSITIVE 0x2 /* high level or low->high edge */ |
| 34 | #define IRQ_POLARITY_NEGATIVE 0x0 /* low level or high->low edge */ |
| 35 | |
| 36 | #define get_irq_desc(irq) (&irq_desc[(irq)]) |
| 37 | |
| 38 | /* Define a way to iterate across irqs. */ |
| 39 | #define for_each_irq(i) \ |
| 40 | for ((i) = 0; (i) < NR_IRQS; ++(i)) |
| 41 | |
| 42 | /* Interrupt numbers are virtual in case they are sparsely |
| 43 | * distributed by the hardware. |
| 44 | */ |
| 45 | extern unsigned int virt_irq_to_real_map[NR_IRQS]; |
| 46 | |
| 47 | /* Create a mapping for a real_irq if it doesn't already exist. |
| 48 | * Return the virtual irq as a convenience. |
| 49 | */ |
| 50 | int virt_irq_create_mapping(unsigned int real_irq); |
| 51 | void virt_irq_init(void); |
| 52 | |
| 53 | static inline unsigned int virt_irq_to_real(unsigned int virt_irq) |
| 54 | { |
| 55 | return virt_irq_to_real_map[virt_irq]; |
| 56 | } |
| 57 | |
| 58 | extern unsigned int real_irq_to_virt_slowpath(unsigned int real_irq); |
| 59 | |
| 60 | /* |
| 61 | * Because many systems have two overlapping names spaces for |
| 62 | * interrupts (ISA and XICS for example), and the ISA interrupts |
| 63 | * have historically not been easy to renumber, we allow ISA |
| 64 | * interrupts to take values 0 - 15, and shift up the remaining |
| 65 | * interrupts by 0x10. |
| 66 | */ |
| 67 | #define NUM_ISA_INTERRUPTS 0x10 |
| 68 | extern int __irq_offset_value; |
| 69 | |
| 70 | static inline int irq_offset_up(int irq) |
| 71 | { |
| 72 | return(irq + __irq_offset_value); |
| 73 | } |
| 74 | |
| 75 | static inline int irq_offset_down(int irq) |
| 76 | { |
| 77 | return(irq - __irq_offset_value); |
| 78 | } |
| 79 | |
| 80 | static inline int irq_offset_value(void) |
| 81 | { |
| 82 | return __irq_offset_value; |
| 83 | } |
| 84 | |
| 85 | static __inline__ int irq_canonicalize(int irq) |
| 86 | { |
| 87 | return irq; |
| 88 | } |
| 89 | |
| 90 | extern int distribute_irqs; |
| 91 | |
| 92 | struct irqaction; |
| 93 | struct pt_regs; |
| 94 | |
| 95 | #ifdef CONFIG_IRQSTACKS |
| 96 | /* |
| 97 | * Per-cpu stacks for handling hard and soft interrupts. |
| 98 | */ |
| 99 | extern struct thread_info *hardirq_ctx[NR_CPUS]; |
| 100 | extern struct thread_info *softirq_ctx[NR_CPUS]; |
| 101 | |
| 102 | extern void irq_ctx_init(void); |
| 103 | extern void call_do_softirq(struct thread_info *tp); |
| 104 | extern int call_handle_IRQ_event(int irq, struct pt_regs *regs, |
| 105 | struct irqaction *action, struct thread_info *tp); |
| 106 | |
| 107 | #define __ARCH_HAS_DO_SOFTIRQ |
| 108 | |
| 109 | #else |
| 110 | #define irq_ctx_init() |
| 111 | |
| 112 | #endif /* CONFIG_IRQSTACKS */ |
| 113 | |
| 114 | #endif /* _ASM_IRQ_H */ |
| 115 | #endif /* __KERNEL__ */ |