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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-s390x/] [hardirq.h] - Blame information for rev 1275

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/*
 *  include/asm-s390/hardirq.h
 *
 *  S390 version
 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
 *               Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
 *
 *  Derived from "include/asm-i386/hardirq.h"
 */
 
#ifndef __ASM_HARDIRQ_H
#define __ASM_HARDIRQ_H
 
#include <linux/config.h>
#include <linux/threads.h>
#include <asm/lowcore.h>
#include <linux/sched.h>
 
/* entry.S is sensitive to the offsets of these fields */
typedef struct {
        unsigned int __softirq_pending;
        unsigned int __local_irq_count;
        unsigned int __local_bh_count;
        unsigned int __syscall_count;
        struct task_struct * __ksoftirqd_task; /* waitqueue is too large */
} ____cacheline_aligned irq_cpustat_t;
 
#include <linux/irq_cpustat.h>  /* Standard mappings for irq_cpustat_t above */
 
/*
 * Are we in an interrupt context? Either doing bottom half
 * or hardware interrupt processing?
 */
#define in_interrupt() ({ int __cpu = smp_processor_id(); \
        (local_irq_count(__cpu) + local_bh_count(__cpu) != 0); })
 
#define in_irq() (local_irq_count(smp_processor_id()) != 0)
 
#ifndef CONFIG_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
 
#include <asm/atomic.h>
#include <asm/smp.h>
 
extern atomic_t global_irq_holder;
extern atomic_t global_irq_lock;
extern atomic_t global_irq_count;
 
static inline void release_irqlock(int cpu)
{
        /* if we didn't own the irq lock, just ignore.. */
        if (atomic_read(&global_irq_holder) ==  cpu) {
                atomic_set(&global_irq_holder,NO_PROC_ID);
                atomic_set(&global_irq_lock,0);
        }
}
 
static inline void hardirq_enter(int cpu)
{
        ++local_irq_count(cpu);
        atomic_inc(&global_irq_count);
}
 
static inline void hardirq_exit(int cpu)
{
        atomic_dec(&global_irq_count);
        --local_irq_count(cpu);
}
 
static inline int hardirq_trylock(int cpu)
{
        return !atomic_read(&global_irq_count) &&
               !atomic_read(&global_irq_lock);
}
 
#define hardirq_endlock(cpu)    do { } while (0)
 
extern void synchronize_irq(void);
 
#endif /* CONFIG_SMP */
 
#endif /* __ASM_HARDIRQ_H */

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* include/asm-s390/hardirq.h`
3			`*`
4			`* S390 version`
5			`* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation`
6			`* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),`
7			`* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)`
8			`*`
9			`* Derived from "include/asm-i386/hardirq.h"`
10			`*/`
11
12			`#ifndef __ASM_HARDIRQ_H`
13			`#define __ASM_HARDIRQ_H`
14
15			`#include <linux/config.h>`
16			`#include <linux/threads.h>`
17			`#include <asm/lowcore.h>`
18			`#include <linux/sched.h>`
19
20			`/* entry.S is sensitive to the offsets of these fields */`
21			`typedef struct {`
22			`unsigned int __softirq_pending;`
23			`unsigned int __local_irq_count;`
24			`unsigned int __local_bh_count;`
25			`unsigned int __syscall_count;`
26			`struct task_struct * __ksoftirqd_task; /* waitqueue is too large */`
27			`} ____cacheline_aligned irq_cpustat_t;`
28
29			`#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */`
30
31			`/*`
32			`* Are we in an interrupt context? Either doing bottom half`
33			`* or hardware interrupt processing?`
34			`*/`
35			`#define in_interrupt() ({ int __cpu = smp_processor_id(); \`
36			`(local_irq_count(__cpu) + local_bh_count(__cpu) != 0); })`
37
38			`#define in_irq() (local_irq_count(smp_processor_id()) != 0)`
39
40			`#ifndef CONFIG_SMP`
41
42			`#define hardirq_trylock(cpu) (local_irq_count(cpu) == 0)`
43			`#define hardirq_endlock(cpu) do { } while (0)`
44
45			`#define hardirq_enter(cpu) (local_irq_count(cpu)++)`
46			`#define hardirq_exit(cpu) (local_irq_count(cpu)--)`
47
48			`#define synchronize_irq() do { } while (0)`
49
50			`#else`
51
52			`#include <asm/atomic.h>`
53			`#include <asm/smp.h>`
54
55			`extern atomic_t global_irq_holder;`
56			`extern atomic_t global_irq_lock;`
57			`extern atomic_t global_irq_count;`
58
59			`static inline void release_irqlock(int cpu)`
60			`{`
61			`/* if we didn't own the irq lock, just ignore.. */`
62			`if (atomic_read(&global_irq_holder) == cpu) {`
63			`atomic_set(&global_irq_holder,NO_PROC_ID);`
64			`atomic_set(&global_irq_lock,0);`
65			`}`
66			`}`
67
68			`static inline void hardirq_enter(int cpu)`
69			`{`
70			`++local_irq_count(cpu);`
71			`atomic_inc(&global_irq_count);`
72			`}`
73
74			`static inline void hardirq_exit(int cpu)`
75			`{`
76			`atomic_dec(&global_irq_count);`
77			`--local_irq_count(cpu);`
78			`}`
79
80			`static inline int hardirq_trylock(int cpu)`
81			`{`
82			`return !atomic_read(&global_irq_count) &&`
83			`!atomic_read(&global_irq_lock);`
84			`}`
85
86			`#define hardirq_endlock(cpu) do { } while (0)`
87
88			`extern void synchronize_irq(void);`
89
90			`#endif /* CONFIG_SMP */`
91
92			`#endif /* __ASM_HARDIRQ_H */`

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-s390x/] [hardirq.h] - Blame information for rev 1275