patch-2.1.34 linux/include/asm-sparc/softirq.h
Next file: linux/include/asm-sparc/spinlock.h
Previous file: linux/include/asm-sparc/smp_lock.h
Back to the patch index
Back to the overall index
- Lines: 116
- Date:
Mon Apr 14 09:31:09 1997
- Orig file:
v2.1.33/linux/include/asm-sparc/softirq.h
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.1.33/linux/include/asm-sparc/softirq.h linux/include/asm-sparc/softirq.h
@@ -0,0 +1,115 @@
+/* softirq.h: 32-bit Sparc soft IRQ support.
+ *
+ * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#ifndef __SPARC_SOFTIRQ_H
+#define __SPARC_SOFTIRQ_H
+
+#include <asm/atomic.h>
+#include <asm/hardirq.h>
+
+/* The locking mechanism for base handlers, to prevent re-entrancy,
+ * is entirely private to an implementation, it should not be
+ * referenced at all outside of this file.
+ */
+extern atomic_t __sparc_bh_counter;
+
+/* Linus, I'd _really_ like to get rid of this synchronize_irq() -DaveM */
+#define start_bh_atomic() \
+ do { atomic_inc(&__sparc_bh_counter); synchronize_irq(); } while(0)
+
+#define end_bh_atomic() atomic_dec(&__sparc_bh_counter)
+
+#define get_active_bhs() (bh_mask & bh_active)
+
+#ifdef __SMP__
+
+#include <asm/spinlock.h>
+
+extern spinlock_t global_bh_lock;
+
+#define init_bh(nr, routine) \
+do { unsigned long flags; \
+ int ent = nr; \
+ spin_lock_irqsave(&global_bh_lock, flags); \
+ bh_base[ent] = routine; \
+ bh_mask_count[ent] = 0; \
+ bh_mask |= 1 << ent; \
+ spin_unlock_irqrestore(&global_bh_lock, flags); \
+} while(0)
+
+#define mark_bh(nr) \
+do { unsigned long flags; \
+ spin_lock_irqsave(&global_bh_lock, flags); \
+ bh_active |= (1 << nr); \
+ spin_unlock_irqrestore(&global_bh_lock, flags); \
+} while(0)
+
+#define disable_bh(nr) \
+do { unsigned long flags; \
+ int ent = nr; \
+ spin_lock_irqsave(&global_bh_lock, flags); \
+ bh_mask &= ~(1 << ent); \
+ bh_mask_count[ent]++; \
+ spin_unlock_irqrestore(&global_bh_lock, flags); \
+} while(0)
+
+#define enable_bh(nr) \
+do { unsigned long flags; \
+ int ent = nr; \
+ spin_lock_irqsave(&global_bh_lock, flags); \
+ if (!--bh_mask_count[ent]) \
+ bh_mask |= 1 << ent; \
+ spin_unlock_irqrestore(&global_bh_lock, flags); \
+} while(0)
+
+#define softirq_trylock() \
+({ \
+ int ret = 1; \
+ if(atomic_add_return(1, &__sparc_bh_counter) != 1) { \
+ atomic_dec(&__sparc_bh_counter); \
+ ret = 0; \
+ } \
+ ret; \
+})
+#define softirq_endlock() atomic_dec(&__sparc_bh_counter)
+#define clear_active_bhs(mask) \
+do { unsigned long flags; \
+ spin_lock_irqsave(&global_bh_lock, flags); \
+ bh_active &= ~(mask); \
+ spin_unlock_irqrestore(&global_bh_lock, flags); \
+} while(0)
+
+#else /* !(__SMP__) */
+
+#define softirq_trylock() \
+ (atomic_read(&__sparc_bh_counter) ? 0 : ((atomic_set(&__sparc_bh_counter,1)),1))
+
+#define softirq_endlock() (atomic_set(&__sparc_bh_counter, 0))
+#define clear_active_bhs(x) (bh_active &= ~(x))
+
+#define init_bh(nr, routine) \
+do { int ent = nr; \
+ bh_base[ent] = routine; \
+ bh_mask_count[ent] = 0; \
+ bh_mask |= 1 << ent; \
+} while(0)
+
+#define mark_bh(nr) (bh_active |= (1 << (nr)))
+
+#define disable_bh(nr) \
+do { int ent = nr; \
+ bh_mask &= ~(1 << ent); \
+ bh_mask_count[ent]++; \
+} while(0)
+
+#define enable_bh(nr) \
+do { int ent = nr; \
+ if (!--bh_mask_count[ent]) \
+ bh_mask |= 1 << ent; \
+} while(0)
+
+#endif /* __SMP__ */
+
+#endif /* __SPARC_SOFTIRQ_H */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov