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>
13 #include <linux/smp.h>
14 #include <linux/irqdomain.h>
16 #include <asm/mipsmtregs.h>
20 #define IRQ_STACK_SIZE THREAD_SIZE
21 #define IRQ_STACK_START (IRQ_STACK_SIZE - 16)
23 extern void __init init_IRQ(void);
24 extern void *irq_stack[NR_CPUS];
27 * The highest address on the IRQ stack contains a dummy frame put down in
28 * genex.S (handle_int & except_vec_vi_handler) which is structured as follows:
31 * | task sp | <- irq_stack[cpu] + IRQ_STACK_START
33 * | | <- First frame of IRQ context
36 * task sp holds a copy of the task stack pointer where the struct pt_regs
37 * from exception entry can be found.
40 static inline bool on_irq_stack(int cpu, unsigned long sp)
42 unsigned long low = (unsigned long)irq_stack[cpu];
43 unsigned long high = low + IRQ_STACK_SIZE;
45 return (low <= sp && sp <= high);
49 static inline int irq_canonicalize(int irq)
51 return ((irq == I8259A_IRQ_BASE + 2) ? I8259A_IRQ_BASE + 9 : irq);
54 #define irq_canonicalize(irq) (irq) /* Sane hardware, sane code ... */
57 asmlinkage void plat_irq_dispatch(void);
59 extern void do_IRQ(unsigned int irq);
61 extern void arch_init_irq(void);
62 extern void spurious_interrupt(void);
64 extern int allocate_irqno(void);
65 extern void alloc_legacy_irqno(void);
66 extern void free_irqno(unsigned int irq);
69 * Before R2 the timer and performance counter interrupts were both fixed to
70 * IE7. Since R2 their number has to be read from the c0_intctl register.
72 #define CP0_LEGACY_COMPARE_IRQ 7
73 #define CP0_LEGACY_PERFCNT_IRQ 7
75 extern int cp0_compare_irq;
76 extern int cp0_compare_irq_shift;
77 extern int cp0_perfcount_irq;
78 extern int cp0_fdc_irq;
80 extern int get_c0_fdc_int(void);
82 void arch_trigger_cpumask_backtrace(const struct cpumask *mask,
84 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
86 #endif /* _ASM_IRQ_H */