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/smp.h>
14
15 #include <asm/mipsmtregs.h>
16
17 #include <irq.h>
18
19 #define IRQ_STACK_SIZE THREAD_SIZE
20 #define IRQ_STACK_START (IRQ_STACK_SIZE - 16)
21
22 extern void *irq_stack[NR_CPUS];
23
24 /*
25 * The highest address on the IRQ stack contains a dummy frame put down in
26 * genex.S (handle_int & except_vec_vi_handler) which is structured as follows:
27 *
28 * top ------------
29 * | task sp | <- irq_stack[cpu] + IRQ_STACK_START
30 * ------------
31 * | | <- First frame of IRQ context
32 * ------------
33 *
34 * task sp holds a copy of the task stack pointer where the struct pt_regs
35 * from exception entry can be found.
36 */
37
on_irq_stack(int cpu,unsigned long sp)38 static inline bool on_irq_stack(int cpu, unsigned long sp)
39 {
40 unsigned long low = (unsigned long)irq_stack[cpu];
41 unsigned long high = low + IRQ_STACK_SIZE;
42
43 return (low <= sp && sp <= high);
44 }
45
46 #ifdef CONFIG_I8259
irq_canonicalize(int irq)47 static inline int irq_canonicalize(int irq)
48 {
49 return ((irq == I8259A_IRQ_BASE + 2) ? I8259A_IRQ_BASE + 9 : irq);
50 }
51 #else
52 #define irq_canonicalize(irq) (irq) /* Sane hardware, sane code ... */
53 #endif
54
55 asmlinkage void plat_irq_dispatch(void);
56
57 extern void do_IRQ(unsigned int irq);
58
59 struct irq_domain;
60 extern void do_domain_IRQ(struct irq_domain *domain, unsigned int irq);
61
62 extern void arch_init_irq(void);
63 extern void spurious_interrupt(void);
64
65 /*
66 * Before R2 the timer and performance counter interrupts were both fixed to
67 * IE7. Since R2 their number has to be read from the c0_intctl register.
68 */
69 #define CP0_LEGACY_COMPARE_IRQ 7
70 #define CP0_LEGACY_PERFCNT_IRQ 7
71
72 extern int cp0_compare_irq;
73 extern int cp0_compare_irq_shift;
74 extern int cp0_perfcount_irq;
75 extern int cp0_fdc_irq;
76
77 extern int get_c0_fdc_int(void);
78
79 void arch_trigger_cpumask_backtrace(const struct cpumask *mask,
80 int exclude_cpu);
81 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
82
83 #endif /* _ASM_IRQ_H */
84