hw/arm_pic.c

   1 /*
   2  * Generic ARM Programmable Interrupt Controller support.
   3  *
   4  * Copyright (c) 2006 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licenced under the LGPL
   8  */
   9
  10 #include "vl.h"
  11 #include "arm_pic.h"
  12
  13 /* Stub functions for hardware that doesn't exist.  */
  14 void pic_set_irq(int irq, int level)
  15 {
  16     cpu_abort(cpu_single_env, "pic_set_irq");
  17 }
  18
  19 void pic_info(void)
  20 {
  21 }
  22
  23 void irq_info(void)
  24 {
  25 }
  26
  27
  28 void pic_set_irq_new(void *opaque, int irq, int level)
  29 {
  30     arm_pic_handler *p = (arm_pic_handler *)opaque;
  31     /* Call the real handler.  */
  32     (*p)(opaque, irq, level);
  33 }
  34
  35 /* Model the IRQ/FIQ CPU interrupt lines as a two input interrupt controller.
  36    Input 0 is IRQ and input 1 is FIQ.  */
  37 typedef struct
  38 {
  39     arm_pic_handler handler;
  40     CPUState *cpu_env;
  41 } arm_pic_cpu_state;
  42
  43 static void arm_pic_cpu_handler(void *opaque, int irq, int level)
  44 {
  45     arm_pic_cpu_state *s = (arm_pic_cpu_state *)opaque;
  46     switch (irq) {
  47     case ARM_PIC_CPU_IRQ:
  48         if (level)
  49             cpu_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);
  50         else
  51             cpu_reset_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);
  52         break;
  53     case ARM_PIC_CPU_FIQ:
  54         if (level)
  55             cpu_interrupt(s->cpu_env, CPU_INTERRUPT_FIQ);
  56         else
  57             cpu_reset_interrupt(s->cpu_env, CPU_INTERRUPT_FIQ);
  58         break;
  59     default:
  60         cpu_abort(s->cpu_env, "arm_pic_cpu_handler: Bad interrput line %d\n",
  61                   irq);
  62     }
  63 }
  64
  65 void *arm_pic_init_cpu(CPUState *env)
  66 {
  67     arm_pic_cpu_state *s;
  68
  69     s = (arm_pic_cpu_state *)malloc(sizeof(arm_pic_cpu_state));
  70     s->handler = arm_pic_cpu_handler;
  71     s->cpu_env = env;
  72     return s;
  73 }