Merge to Fedora kernel-2.6.18-1.2255_FC5-vs2.0.2.2-rc9 patched with stable patch...
[linux-2.6.git] / include / asm-mips / irq.h
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 1994 by Waldorf GMBH, written by Ralf Baechle
7  * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02, 03 by Ralf Baechle
8  */
9 #ifndef _ASM_IRQ_H
10 #define _ASM_IRQ_H
11
12 #include <linux/linkage.h>
13 #include <linux/vs_context.h>
14
15 #include <asm/mipsmtregs.h>
16
17 #include <irq.h>
18
19 #ifdef CONFIG_I8259
20 static inline int irq_canonicalize(int irq)
21 {
22         return ((irq == 2) ? 9 : irq);
23 }
24 #else
25 #define irq_canonicalize(irq) (irq)     /* Sane hardware, sane code ... */
26 #endif
27
28 struct pt_regs;
29
30 extern asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs);
31
32 #ifdef CONFIG_MIPS_MT_SMTC
33 /*
34  * Clear interrupt mask handling "backstop" if irq_hwmask
35  * entry so indicates. This implies that the ack() or end()
36  * functions will take over re-enabling the low-level mask.
37  * Otherwise it will be done on return from exception.
38  */
39 #define __DO_IRQ_SMTC_HOOK()                                            \
40 do {                                                                    \
41         if (irq_hwmask[irq] & 0x0000ff00)                               \
42                 write_c0_tccontext(read_c0_tccontext() &                \
43                                    ~(irq_hwmask[irq] & 0x0000ff00));    \
44 } while (0)
45 #else
46 #define __DO_IRQ_SMTC_HOOK() do { } while (0)
47 #endif
48
49 #ifdef CONFIG_PREEMPT
50
51 /*
52  * do_IRQ handles all normal device IRQ's (the special
53  * SMP cross-CPU interrupts have their own specific
54  * handlers).
55  *
56  * Ideally there should be away to get this into kernel/irq/handle.c to
57  * avoid the overhead of a call for just a tiny function ...
58  */
59 #define do_IRQ(irq, regs)                                               \
60 do {                                                                    \
61         irq_enter();                                                    \
62         __DO_IRQ_SMTC_HOOK();                                           \
63         __do_IRQ((irq), (regs));                                        \
64         irq_exit();                                                     \
65 } while (0)
66
67 #endif
68
69 extern void arch_init_irq(void);
70 extern void spurious_interrupt(struct pt_regs *regs);
71
72 #ifdef CONFIG_MIPS_MT_SMTC
73 struct irqaction;
74
75 extern unsigned long irq_hwmask[];
76 extern int setup_irq_smtc(unsigned int irq, struct irqaction * new,
77                           unsigned long hwmask);
78 #endif /* CONFIG_MIPS_MT_SMTC */
79
80 #ifdef CONFIG_SMP
81 #define ARCH_HAS_IRQ_PER_CPU
82 #endif
83
84 #endif /* _ASM_IRQ_H */