diff options
author | Ralf Baechle <ralf@linux-mips.org> | 1997-04-29 21:13:14 +0000 |
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committer | <ralf@linux-mips.org> | 1997-04-29 21:13:14 +0000 |
commit | 19c9bba94152148523ba0f7ef7cffe3d45656b11 (patch) | |
tree | 40b1cb534496a7f1ca0f5c314a523c69f1fee464 /include/asm-sparc/hardirq.h | |
parent | 7206675c40394c78a90e74812bbdbf8cf3cca1be (diff) |
Import of Linux/MIPS 2.1.36
Diffstat (limited to 'include/asm-sparc/hardirq.h')
-rw-r--r-- | include/asm-sparc/hardirq.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/include/asm-sparc/hardirq.h b/include/asm-sparc/hardirq.h new file mode 100644 index 000000000..2d3f70bc6 --- /dev/null +++ b/include/asm-sparc/hardirq.h @@ -0,0 +1,71 @@ +/* hardirq.h: 32-bit Sparc hard IRQ support. + * + * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) + */ + +#ifndef __SPARC_HARDIRQ_H +#define __SPARC_HARDIRQ_H + +#include <linux/tasks.h> + +extern unsigned int local_irq_count[NR_CPUS]; +#define in_interrupt() (local_irq_count[smp_processor_id()] != 0) + +#ifndef __SMP__ + +#define hardirq_trylock(cpu) (local_irq_count[cpu] == 0) +#define hardirq_endlock(cpu) do { } while(0) + +#define hardirq_enter(cpu) (local_irq_count[cpu]++) +#define hardirq_exit(cpu) (local_irq_count[cpu]--) + +#define synchronize_irq() do { } while(0) + +#else /* __SMP__ */ + +#include <asm/atomic.h> +#include <asm/spinlock.h> +#include <asm/system.h> +#include <asm/smp.h> + +extern unsigned char global_irq_holder; +extern spinlock_t global_irq_lock; +extern atomic_t global_irq_count; + +#define release_irqlock(cpu) \ +do { if(global_irq_holder == (unsigned char) cpu) { \ + global_irq_holder = NO_PROC_ID; \ + spin_unlock(&global_irq_lock); \ + } \ +} while(0) + +/* Ordering of the counter bumps is _deadly_ important. */ +#define hardirq_enter(cpu) \ + do { ++local_irq_count[cpu]; atomic_inc(&global_irq_count); } while(0) + +#define hardirq_exit(cpu) \ + do { atomic_dec(&global_irq_count); --local_irq_count[cpu]; } while(0) + +#define hardirq_trylock(cpu) \ +({ unsigned long flags; int ret = 1; \ + __save_flags(flags); \ + __cli(); \ + if(atomic_add_return(1, &global_irq_count) != 1 || \ + global_irq_lock) { \ + atomic_dec(&global_irq_count); \ + __restore_flags(flags); \ + ret = 0; \ + } else { \ + ++local_irq_count[cpu]; \ + __sti(); \ + } \ + ret; \ +}) + +#define hardirq_endlock(cpu) do { __cli(); hardirq_exit(cpu); __sti(); } while(0) + +extern void synchronize_irq(void); + +#endif /* __SMP__ */ + +#endif /* __SPARC_HARDIRQ_H */ |