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