| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _ASM_IRQ_H |
| 2 | #define _ASM_IRQ_H |
| 3 | |
| 4 | /* |
| 5 | * linux/include/asm/irq.h |
| 6 | * |
| 7 | * (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar |
| 8 | * |
| 9 | * IRQ/IPI changes taken from work by Thomas Radke |
| 10 | * <tomsoft@informatik.tu-chemnitz.de> |
| 11 | */ |
| 12 | |
| 13 | #define TIMER_IRQ 0 |
| 14 | |
| 15 | /* |
| 16 | * 16 8259A IRQ's, 208 potential APIC interrupt sources. |
| 17 | * Right now the APIC is mostly only used for SMP. |
| 18 | * 256 vectors is an architectural limit. (we can have |
| 19 | * more than 256 devices theoretically, but they will |
| 20 | * have to use shared interrupts) |
| 21 | * Since vectors 0x00-0x1f are used/reserved for the CPU, |
| 22 | * the usable vector space is 0x20-0xff (224 vectors) |
| 23 | */ |
| 24 | |
| 25 | /* |
| 26 | * The maximum number of vectors supported by x86_64 processors |
| 27 | * is limited to 256. For processors other than x86_64, NR_VECTORS |
| 28 | * should be changed accordingly. |
| 29 | */ |
| 30 | #define NR_VECTORS 256 |
| 31 | |
| 32 | #define FIRST_SYSTEM_VECTOR 0xef /* duplicated in hw_irq.h */ |
| 33 | |
| 34 | #ifdef CONFIG_PCI_MSI |
| 35 | #define NR_IRQS FIRST_SYSTEM_VECTOR |
| 36 | #define NR_IRQ_VECTORS NR_IRQS |
| 37 | #else |
| 38 | #define NR_IRQS 224 |
| 39 | #define NR_IRQ_VECTORS 1024 |
| 40 | #endif |
| 41 | |
| 42 | static __inline__ int irq_canonicalize(int irq) |
| 43 | { |
| 44 | return ((irq == 2) ? 9 : irq); |
| 45 | } |
| 46 | |
| 47 | #ifdef CONFIG_X86_LOCAL_APIC |
| 48 | #define ARCH_HAS_NMI_WATCHDOG /* See include/linux/nmi.h */ |
| 49 | #endif |
| 50 | |
| 51 | struct irqaction; |
| 52 | struct pt_regs; |
| 53 | int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *); |
| 54 | |
| 55 | #endif /* _ASM_IRQ_H */ |