include/asm-sparc64/hardirq.h

Name: Public Git Hosting - davej-history.git/blob - include/asm-sparc64/hardirq.h
Rating: 4.9 (4948 reviews)
 1 /* hardirq.h: 64-bit Sparc hard IRQ support.
 2  *
 3  * Copyright (C) 1997, 1998 David S. Miller (davem@caip.rutgers.edu)
 4  */
 5
 6 #ifndef __SPARC64_HARDIRQ_H
 7 #define __SPARC64_HARDIRQ_H
 8
 9 #include <linux/threads.h>
 10
 11 #ifndef __SMP__
 12 externunsigned int local_irq_count;
 13 #else
 14 #define local_irq_count (cpu_data[smp_processor_id()].irq_count)
 15 #endif
 16
 17 /*
 18  * Are we in an interrupt context? Either doing bottom half
 19  * or hardware interrupt processing?
 20  */
 21 #define in_interrupt() ((local_irq_count + local_bh_count) != 0)
 22
 23 #ifndef __SMP__
 24
 25 #define hardirq_trylock(cpu) (local_irq_count == 0)
 26 #define hardirq_endlock(cpu) do { } while(0)
 27
 28 #define hardirq_enter(cpu) (local_irq_count++)
 29 #define hardirq_exit(cpu) (local_irq_count--)
 30
 31 #define synchronize_irq() barrier()
 32
 33 #else/* (__SMP__) */
 34
 35 #include <asm/atomic.h>
 36 #include <linux/spinlock.h>
 37 #include <asm/system.h>
 38 #include <asm/smp.h>
 39
 40 externunsigned char global_irq_holder;
 41 extern spinlock_t global_irq_lock;
 42 extern atomic_t global_irq_count;
 43
 44 staticinlinevoidrelease_irqlock(int cpu)
 45 {
 46 /* if we didn't own the irq lock, just ignore... */
 47 if(global_irq_holder == (unsigned char) cpu) {
 48  global_irq_holder = NO_PROC_ID;
 49 spin_unlock(&global_irq_lock);
 50 }
 51 }
 52
 53 staticinlinevoidhardirq_enter(int cpu)
 54 {
 55 ++(cpu_data[cpu].irq_count);
 56 atomic_inc(&global_irq_count);
 57 membar("#StoreLoad | #StoreStore");
 58 }
 59
 60 staticinlinevoidhardirq_exit(int cpu)
 61 {
 62 membar("#StoreStore | #LoadStore");
 63 atomic_dec(&global_irq_count);
 64 --(cpu_data[cpu].irq_count);
 65 }
 66
 67 staticinlineinthardirq_trylock(int cpu)
 68 {
 69 return(!atomic_read(&global_irq_count) &&
 70 !spin_is_locked(&global_irq_lock));
 71 }
 72
 73 #define hardirq_endlock(cpu) do { } while (0)
 74
 75 externvoidsynchronize_irq(void);
 76
 77 #endif/* __SMP__ */
 78
 79 #endif/* !(__SPARC64_HARDIRQ_H) */