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
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
12 #include <linux/linkage.h>
14 #include <asm/mipsmtregs.h>
19 static inline int irq_canonicalize(int irq)
21 return ((irq == I8259A_IRQ_BASE + 2) ? I8259A_IRQ_BASE + 9 : irq);
24 #define irq_canonicalize(irq) (irq) /* Sane hardware, sane code ... */
27 #ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP
29 * Clear interrupt mask handling "backstop" if irq_hwmask
30 * entry so indicates. This implies that the ack() or end()
31 * functions will take over re-enabling the low-level mask.
32 * Otherwise it will be done on return from exception.
34 #define __DO_IRQ_SMTC_HOOK(irq) \
36 if (irq_hwmask[irq] & 0x0000ff00) \
37 write_c0_tccontext(read_c0_tccontext() & \
38 ~(irq_hwmask[irq] & 0x0000ff00)); \
41 #define __DO_IRQ_SMTC_HOOK(irq) do { } while (0)
45 * do_IRQ handles all normal device IRQ's (the special
46 * SMP cross-CPU interrupts have their own specific
49 * Ideally there should be away to get this into kernel/irq/handle.c to
50 * avoid the overhead of a call for just a tiny function ...
55 __DO_IRQ_SMTC_HOOK(irq); \
56 generic_handle_irq(irq); \
60 extern void arch_init_irq(void);
61 extern void spurious_interrupt(void);
63 #ifdef CONFIG_MIPS_MT_SMTC
66 extern unsigned long irq_hwmask[];
67 extern int setup_irq_smtc(unsigned int irq, struct irqaction * new,
68 unsigned long hwmask);
69 #endif /* CONFIG_MIPS_MT_SMTC */
71 extern int allocate_irqno(void);
72 extern void alloc_legacy_irqno(void);
73 extern void free_irqno(unsigned int irq);
76 * Before R2 the timer and performance counter interrupts were both fixed to
77 * IE7. Since R2 their number has to be read from the c0_intctl register.
79 #define CP0_LEGACY_COMPARE_IRQ 7
81 extern int cp0_compare_irq;
82 extern int cp0_perfcount_irq;
84 #endif /* _ASM_IRQ_H */