arch/mips/include/asm/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/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
  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
  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 */