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/* $Id: softirq.h,v 1.8 1999/08/13 17:07:27 harald 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, 1999 by Ralf Baechle
*/
#ifndef __ASM_MIPS_SOFTIRQ_H
#define __ASM_MIPS_SOFTIRQ_H
#include <linux/config.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 cpu_bh_disable(cpu) do { local_bh_count[(cpu)]++; barrier(); } while (0)
#define cpu_bh_enable(cpu) do { barrier(); local_bh_count[(cpu)]--; } while (0)
#define cpu_bh_trylock(cpu) (local_bh_count[(cpu)] ? 0 : (local_bh_count[(cpu)] = 1))
#define cpu_bh_endlock(cpu) (local_bh_count[(cpu)] = 0)
#define local_bh_disable() cpu_bh_disable(smp_processor_id())
#define local_bh_enable() cpu_bh_enable(smp_processor_id())
#define get_active_bhs() (bh_mask & bh_active)
#if !defined(CONFIG_CPU_HAS_LLSC)
#define clear_active_bhs(x) atomic_clear_mask((x),&bh_active)
#else
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));
}
#endif
extern inline void init_bh(int nr, void (*routine)(void))
{
bh_base[nr] = routine;
atomic_set(&bh_mask_count[nr], 0);
bh_mask |= 1 << nr;
}
extern inline void remove_bh(int nr)
{
bh_mask &= ~(1 << nr);
mb();
bh_base[nr] = NULL;
}
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);
atomic_inc(&bh_mask_count[nr]);
}
extern inline void enable_bh(int nr)
{
if (atomic_dec_and_test(&bh_mask_count[nr]))
bh_mask |= 1 << nr;
}
extern inline void start_bh_atomic(void)
{
local_bh_disable();
barrier();
}
extern inline void end_bh_atomic(void)
{
barrier();
local_bh_enable();
}
/* These are for the irq's testing the lock */
#define softirq_trylock(cpu) (cpu_bh_trylock(cpu))
#define softirq_endlock(cpu) (cpu_bh_endlock(cpu))
#define synchronize_bh() barrier()
#endif /* __ASM_MIPS_SOFTIRQ_H */
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