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 #include <linux/irqdomain.h>
  15
  16 #include <asm/mipsmtregs.h>
  17
  18 #include <irq.h>
  19
  20 #define IRQ_STACK_SIZE                  THREAD_SIZE
  21
  22 extern void *irq_stack[NR_CPUS];
  23
  24 static inline bool on_irq_stack(int cpu, unsigned long sp)
  25 {
  26         unsigned long low = (unsigned long)irq_stack[cpu];
  27         unsigned long high = low + IRQ_STACK_SIZE;
  28
  29         return (low <= sp && sp <= high);
  30 }
  31
  32 #ifdef CONFIG_I8259
  33 static inline int irq_canonicalize(int irq)
  34 {
  35         return ((irq == I8259A_IRQ_BASE + 2) ? I8259A_IRQ_BASE + 9 : irq);
  36 }
  37 #else
  38 #define irq_canonicalize(irq) (irq)     /* Sane hardware, sane code ... */
  39 #endif
  40
  41 asmlinkage void plat_irq_dispatch(void);
  42
  43 extern void do_IRQ(unsigned int irq);
  44
  45 extern void arch_init_irq(void);
  46 extern void spurious_interrupt(void);
  47
  48 extern int allocate_irqno(void);
  49 extern void alloc_legacy_irqno(void);
  50 extern void free_irqno(unsigned int irq);
  51
  52 /*
  53  * Before R2 the timer and performance counter interrupts were both fixed to
  54  * IE7.  Since R2 their number has to be read from the c0_intctl register.
  55  */
  56 #define CP0_LEGACY_COMPARE_IRQ 7
  57 #define CP0_LEGACY_PERFCNT_IRQ 7
  58
  59 extern int cp0_compare_irq;
  60 extern int cp0_compare_irq_shift;
  61 extern int cp0_perfcount_irq;
  62 extern int cp0_fdc_irq;
  63
  64 extern int get_c0_fdc_int(void);
  65
  66 void arch_trigger_cpumask_backtrace(const struct cpumask *mask,
  67                                     bool exclude_self);
  68 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
  69
  70 #endif /* _ASM_IRQ_H */