1#ifndef _ASM_IA64_HARDIRQ_H 2#define _ASM_IA64_HARDIRQ_H 3 4/* 5 * Copyright (C) 1998-2001 Hewlett-Packard Co 6 * Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com> 7 */ 8 9#include <linux/config.h> 10 11#include <linux/threads.h> 12#include <linux/irq.h> 13 14#include <asm/processor.h> 15 16/* 17 * No irq_cpustat_t for IA-64. The data is held in the per-CPU data structure. 18 */ 19#define softirq_pending(cpu) (cpu_data(cpu)->softirq_pending) 20#define ksoftirqd_task(cpu) (cpu_data(cpu)->ksoftirqd) 21#define irq_count(cpu) (cpu_data(cpu)->irq_stat.f.irq_count) 22#define bh_count(cpu) (cpu_data(cpu)->irq_stat.f.bh_count) 23#define syscall_count(cpu) /* unused on IA-64 */ 24#define nmi_count(cpu) 0 25 26#define local_softirq_pending() (local_cpu_data->softirq_pending) 27#define local_ksoftirqd_task() (local_cpu_data->ksoftirqd) 28#define really_local_irq_count() (local_cpu_data->irq_stat.f.irq_count) 29#define really_local_bh_count() (local_cpu_data->irq_stat.f.bh_count) 30#define local_syscall_count() /* unused on IA-64 */ 31#define local_nmi_count() 0 32 33/* 34 * Are we in an interrupt context? Either doing bottom half or hardware interrupt 35 * processing? 36 */ 37#define in_interrupt() (local_cpu_data->irq_stat.irq_and_bh_counts != 0) 38#define in_irq() (local_cpu_data->irq_stat.f.irq_count != 0) 39 40#ifndef CONFIG_SMP 41# define local_hardirq_trylock() (really_local_irq_count() == 0) 42# define local_hardirq_endlock() do { } while (0) 43 44# define local_irq_enter(irq) (really_local_irq_count()++) 45# define local_irq_exit(irq) (really_local_irq_count()--) 46 47# define synchronize_irq() barrier() 48#else 49 50#include <asm/atomic.h> 51#include <asm/smp.h> 52 53extern unsigned int global_irq_holder; 54extern volatile unsigned long global_irq_lock; 55 56static inline int 57irqs_running (void) 58{ 59 int i; 60 61 for (i = 0; i < smp_num_cpus; i++) 62 if (irq_count(i)) 63 return 1; 64 return 0; 65} 66 67static inline void 68release_irqlock (int cpu) 69{ 70 /* if we didn't own the irq lock, just ignore.. */ 71 if (global_irq_holder == cpu) { 72 global_irq_holder = NO_PROC_ID; 73 smp_mb__before_clear_bit(); /* need barrier before releasing lock... */ 74 clear_bit(0,&global_irq_lock); 75 } 76} 77 78static inline void 79local_irq_enter (int irq) 80{ 81 really_local_irq_count()++; 82 83 while (test_bit(0,&global_irq_lock)) { 84 /* nothing */; 85 } 86} 87 88static inline void 89local_irq_exit (int irq) 90{ 91 really_local_irq_count()--; 92} 93 94static inline int 95local_hardirq_trylock (void) 96{ 97 return !really_local_irq_count() && !test_bit(0,&global_irq_lock); 98} 99 100#define local_hardirq_endlock() do { } while (0) 101 102extern void synchronize_irq (void); 103 104#endif /* CONFIG_SMP */ 105#endif /* _ASM_IA64_HARDIRQ_H */ 106