1 #ifndef __ASM_SOFTIRQ_H
2 #define __ASM_SOFTIRQ_H
4 #include <asm/atomic.h>
5 #include <asm/hardirq.h>
7 #define get_active_bhs() (bh_mask & bh_active)
8 #define clear_active_bhs(x) atomic_clear_mask((x),&bh_active)
10 extern unsigned int ppc_local_bh_count
[NR_CPUS
];
12 extern inline void init_bh(int nr
, void (*routine
)(void))
14 bh_base
[nr
] = routine
;
15 atomic_set(&bh_mask_count
[nr
], 0);
19 extern inline void remove_bh(int nr
)
21 bh_mask
&= ~(1 << nr
);
26 extern inline void mark_bh(int nr
)
28 set_bit(nr
, &bh_active
);
34 * The locking mechanism for base handlers, to prevent re-entrancy,
35 * is entirely private to an implementation, it should not be
36 * referenced at all outside of this file.
38 extern atomic_t global_bh_lock
;
39 extern atomic_t global_bh_count
;
41 extern void synchronize_bh(void);
43 static inline void start_bh_atomic(void)
45 atomic_inc(&global_bh_lock
);
49 static inline void end_bh_atomic(void)
51 atomic_dec(&global_bh_lock
);
54 /* These are for the IRQs testing the lock */
55 static inline int softirq_trylock(int cpu
)
57 if (ppc_local_bh_count
[cpu
] == 0) {
58 ppc_local_bh_count
[cpu
] = 1;
59 if (!test_and_set_bit(0,&global_bh_count
)) {
61 if (atomic_read(&global_bh_lock
) == 0)
63 clear_bit(0,&global_bh_count
);
65 ppc_local_bh_count
[cpu
] = 0;
71 static inline void softirq_endlock(int cpu
)
74 ppc_local_bh_count
[cpu
]--;
75 clear_bit(0,&global_bh_count
);
80 extern inline void start_bh_atomic(void)
82 ppc_local_bh_count
[smp_processor_id()]++;
86 extern inline void end_bh_atomic(void)
89 ppc_local_bh_count
[smp_processor_id()]--;
92 /* These are for the irq's testing the lock */
93 #define softirq_trylock(cpu) (ppc_local_bh_count[cpu] ? 0 : (ppc_local_bh_count[cpu]=1))
94 #define softirq_endlock(cpu) (ppc_local_bh_count[cpu] = 0)
95 #define synchronize_bh() barrier()
99 #define local_bh_disable() (ppc_local_bh_count[smp_processor_id()]++)
100 #define local_bh_enable() (ppc_local_bh_count[smp_processor_id()]--)
103 * These use a mask count to correctly handle
104 * nested disable/enable calls
106 extern inline void disable_bh(int nr
)
108 bh_mask
&= ~(1 << nr
);
109 atomic_inc(&bh_mask_count
[nr
]);
113 extern inline void enable_bh(int nr
)
115 if (atomic_dec_and_test(&bh_mask_count
[nr
]))
119 #endif /* __ASM_SOFTIRQ_H */