hw/openrisc/pic_cpu.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 2.1 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/irq.h"
  23 #include "cpu.h"
  24
  25 /* OpenRISC pic handler */
  26 static 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
  52 void 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 }