LXR qemu/hw/openrisc/pic

   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 "qemu/osdep.h"
  22#include "hw/hw.h"
  23#include "cpu.h"
  24
  25/* OpenRISC pic handler */
  26static void openrisc_pic_cpu_handler(void *opaque, int irq, int level)
  27{
  28    OpenRISCCPU *cpu = (OpenRISCCPU *)opaque;
  29    CPUState *cs = CPU(cpu);
  30    uint32_t irq_bit;
  31
  32    if (irq > 31 || irq < 0) {
  33        return;
  34    }
  35
  36    irq_bit = 1U << irq;
  37
  38    if (level) {
  39        cpu->env.picsr |= irq_bit;
  40    } else {
  41        cpu->env.picsr &= ~irq_bit;
  42    }
  43
  44    if (cpu->env.picsr & cpu->env.picmr) {
  45        cpu_interrupt(cs, CPU_INTERRUPT_HARD);
  46    } else {
  47        cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
  48        cpu->env.picsr = 0;
  49    }
  50}
  51
  52void cpu_openrisc_pic_init(OpenRISCCPU *cpu)
  53{
  54    int i;
  55    qemu_irq *qi;
  56    qi = qemu_allocate_irqs(openrisc_pic_cpu_handler, cpu, NR_IRQS);
  57
  58    for (i = 0; i < NR_IRQS; i++) {
  59        cpu->env.irq[i] = qi[i];
  60    }
  61}
  62