1 /* $Id: hardirq.h,v 1.8 2000/03/02 02:37:13 ralf Exp $
2 *
3 * This file is subject to the terms and conditions of the GNU General Public
4 * License. See the file "COPYING" in the main directory of this archive
5 * for more details.
6 *
7 * Copyright (C) 1997, 1998, 1999, 2000 by Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 */
10 #ifndef _ASM_HARDIRQ_H
11 #define _ASM_HARDIRQ_H
12
13 #include <linux/config.h>
14 #include <linux/threads.h>
15 #include <linux/irq.h>
16
17 /* entry.S is sensitive to the offsets of these fields */
18 typedef struct {
19 unsigned int __softirq_active;
20 unsigned int __softirq_mask;
21 unsigned int __local_irq_count;
22 unsigned int __local_bh_count;
23 unsigned int __syscall_count;
24 } ____cacheline_aligned irq_cpustat_t;
25
26 #include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
27
28 /*
29 * Are we in an interrupt context? Either doing bottom half
30 * or hardware interrupt processing?
31 */
32 #define in_interrupt() ({ int __cpu = smp_processor_id(); \
33 (local_irq_count(__cpu) + local_bh_count(__cpu) != 0); })
34 #define in_irq() (local_irq_count(smp_processor_id()) != 0)
35
36 #ifndef CONFIG_SMP
37
38 #define hardirq_trylock(cpu) (local_irq_count(cpu) == 0)
39 #define hardirq_endlock(cpu) do { } while (0)
40
41 #define irq_enter(cpu) (local_irq_count(cpu)++)
42 #define irq_exit(cpu) (local_irq_count(cpu)--)
43
44 #define synchronize_irq() barrier();
45
46 #else
47
48 #error No habla MIPS SMP
49
50 #endif /* CONFIG_SMP */
51 #endif /* _ASM_HARDIRQ_H */
52
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