hw/openrisc_pic.c

   1 /*
   2  * OpenRISC Programmable Interrupt Controller support.
   3  *
   4  * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
   5  *                         Feng Gao <gf91597@gmail.com>
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "hw.h"
  22 #include "cpu.h"
  23
  24 /* OpenRISC pic handler */
  25 static void openrisc_pic_cpu_handler(void *opaque, int irq, int level)
  26 {
  27     OpenRISCCPU *cpu = (OpenRISCCPU *)opaque;
  28     int i;
  29     uint32_t irq_bit = 1 << irq;
  30
  31     if (irq > 31 || irq < 0) {
  32         return;
  33     }
  34
  35     if (level) {
  36         cpu->env.picsr |= irq_bit;
  37     } else {
  38         cpu->env.picsr &= ~irq_bit;
  39     }
  40
  41     for (i = 0; i < 32; i++) {
  42         if ((cpu->env.picsr && (1 << i)) && (cpu->env.picmr && (1 << i))) {
  43             cpu_interrupt(&cpu->env, CPU_INTERRUPT_HARD);
  44         } else {
  45             cpu_reset_interrupt(&cpu->env, CPU_INTERRUPT_HARD);
  46             cpu->env.picsr &= ~(1 << i);
  47         }
  48     }
  49 }
  50
  51 void cpu_openrisc_pic_init(OpenRISCCPU *cpu)
  52 {
  53     int i;
  54     qemu_irq *qi;
  55     qi = qemu_allocate_irqs(openrisc_pic_cpu_handler, cpu, NR_IRQS);
  56
  57     for (i = 0; i < NR_IRQS; i++) {
  58         cpu->env.irq[i] = qi[i];
  59     }
  60 }