| /* hardirq.h: PA-RISC hard IRQ support. |
| * |
| * Copyright (C) 2001 Matthew Wilcox <matthew@wil.cx> |
| * |
| * The locking is really quite interesting. There's a cpu-local |
| * count of how many interrupts are being handled, and a global |
| * lock. An interrupt can only be serviced if the global lock |
| * is free. You can't be sure no more interrupts are being |
| * serviced until you've acquired the lock and then checked |
| * all the per-cpu interrupt counts are all zero. It's a specialised |
| * br_lock, and that's exactly how Sparc does it. We don't because |
| * it's more locking for us. This way is lock-free in the interrupt path. |
| */ |
| |
| #ifndef _PARISC_HARDIRQ_H |
| #define _PARISC_HARDIRQ_H |
| |
| #include <linux/config.h> |
| #include <linux/threads.h> |
| #include <linux/cache.h> |
| #include <linux/irq.h> |
| |
| typedef struct { |
| unsigned long __softirq_pending; /* set_bit is used on this */ |
| } ____cacheline_aligned irq_cpustat_t; |
| |
| #include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */ |
| |
| #define HARDIRQ_BITS 16 |
| |
| /* |
| * The hardirq mask has to be large enough to have space for potentially all |
| * IRQ sources in the system nesting on a single CPU: |
| */ |
| #if (1 << HARDIRQ_BITS) < NR_IRQS |
| # error HARDIRQ_BITS is too low! |
| #endif |
| |
| void ack_bad_irq(unsigned int irq); |
| |
| #endif /* _PARISC_HARDIRQ_H */ |
