tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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#include <linux/irqdomain.h>
15
16#include <asm/mipsmtregs.h>
17
18#include <irq.h>
19
20#define IRQ_STACK_SIZE THREAD_SIZE
21#define IRQ_STACK_START (IRQ_STACK_SIZE - 16)
22
23extern void __init init_IRQ(void);
24extern void *irq_stack[NR_CPUS];
25
26/*
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:
29 *
30 * top ------------
31 * | task sp | <- irq_stack[cpu] + IRQ_STACK_START
32 * ------------
33 * | | <- First frame of IRQ context
34 * ------------
35 *
36 * task sp holds a copy of the task stack pointer where the struct pt_regs
37 * from exception entry can be found.
38 */
39
40static inline bool on_irq_stack(int cpu, unsigned long sp)
41{
42 unsigned long low = (unsigned long)irq_stack[cpu];
43 unsigned long high = low + IRQ_STACK_SIZE;
44
45 return (low <= sp && sp <= high);
46}
47
48#ifdef CONFIG_I8259
49static inline int irq_canonicalize(int irq)
50{
51 return ((irq == I8259A_IRQ_BASE + 2) ? I8259A_IRQ_BASE + 9 : irq);
52}
53#else
54#define irq_canonicalize(irq) (irq) /* Sane hardware, sane code ... */
55#endif
56
57asmlinkage void plat_irq_dispatch(void);
58
59extern void do_IRQ(unsigned int irq);
60
61extern void arch_init_irq(void);
62extern void spurious_interrupt(void);
63
64extern int allocate_irqno(void);
65extern void alloc_legacy_irqno(void);
66extern void free_irqno(unsigned int irq);
67
68/*
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.
71 */
72#define CP0_LEGACY_COMPARE_IRQ 7
73#define CP0_LEGACY_PERFCNT_IRQ 7
74
75extern int cp0_compare_irq;
76extern int cp0_compare_irq_shift;
77extern int cp0_perfcount_irq;
78extern int cp0_fdc_irq;
79
80extern int get_c0_fdc_int(void);
81
82void arch_trigger_cpumask_backtrace(const struct cpumask *mask,
83 bool exclude_self);
84#define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
85
86#endif /* _ASM_IRQ_H */