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- /* $Id: softirq.h,v 1.5 1998/08/29 21:20:22 ralf Exp $
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1997, 1998 by Ralf Baechle
- */
- #ifndef __ASM_MIPS_SOFTIRQ_H
- #define __ASM_MIPS_SOFTIRQ_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 __mips_bh_counter;
-
- extern unsigned int local_bh_count[NR_CPUS];
-
- #define get_active_bhs() (bh_mask & bh_active)
-
- static inline void clear_active_bhs(unsigned long x)
- {
- unsigned long temp;
-
- __asm__ __volatile__(
- "1:\tll\t%0,%1\n\t"
- "and\t%0,%2\n\t"
- "sc\t%0,%1\n\t"
- "beqz\t%0,1b"
- :"=&r" (temp),
- "=m" (bh_active)
- :"Ir" (~x),
- "m" (bh_active));
- }
-
- extern inline void init_bh(int nr, void (*routine)(void))
- {
- bh_base[nr] = routine;
- bh_mask_count[nr] = 0;
- bh_mask |= 1 << nr;
- }
-
- extern inline void remove_bh(int nr)
- {
- bh_base[nr] = NULL;
- bh_mask &= ~(1 << nr);
- }
-
- extern inline void mark_bh(int nr)
- {
- set_bit(nr, &bh_active);
- }
-
- /*
- * These use a mask count to correctly handle
- * nested disable/enable calls
- */
- extern inline void disable_bh(int nr)
- {
- bh_mask &= ~(1 << nr);
- bh_mask_count[nr]++;
- }
-
- extern inline void enable_bh(int nr)
- {
- if (!--bh_mask_count[nr])
- bh_mask |= 1 << nr;
- }
-
- extern inline void start_bh_atomic(void)
- {
- local_bh_count[smp_processor_id()]++;
- barrier();
- }
-
- extern inline void end_bh_atomic(void)
- {
- barrier();
- local_bh_count[smp_processor_id()]--;
- }
-
- /* These are for the irq's testing the lock */
- #define softirq_trylock(cpu) (local_bh_count[cpu] ? 0 : (local_bh_count[cpu] = 1))
- #define softirq_endlock(cpu) (local_bh_count[cpu] = 0)
- #define synchronize_bh() barrier()
-
- #endif /* __ASM_MIPS_SOFTIRQ_H */
-