LXR qemu/hw/mips/mips

   1/*
   2 * QEMU MIPS interrupt support
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a copy
   5 * of this software and associated documentation files (the "Software"), to deal
   6 * in the Software without restriction, including without limitation the rights
   7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8 * copies of the Software, and to permit persons to whom the Software is
   9 * furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  20 * THE SOFTWARE.
  21 */
  22
  23#include "hw/hw.h"
  24#include "hw/mips/cpudevs.h"
  25#include "cpu.h"
  26
  27static void cpu_mips_irq_request(void *opaque, int irq, int level)
  28{
  29    MIPSCPU *cpu = opaque;
  30    CPUMIPSState *env = &cpu->env;
  31    CPUState *cs = CPU(cpu);
  32
  33    if (irq < 0 || irq > 7)
  34        return;
  35
  36    if (level) {
  37        env->CP0_Cause |= 1 << (irq + CP0Ca_IP);
  38    } else {
  39        env->CP0_Cause &= ~(1 << (irq + CP0Ca_IP));
  40    }
  41
  42    if (env->CP0_Cause & CP0Ca_IP_mask) {
  43        cpu_interrupt(cs, CPU_INTERRUPT_HARD);
  44    } else {
  45        cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
  46    }
  47}
  48
  49void cpu_mips_irq_init_cpu(CPUMIPSState *env)
  50{
  51    qemu_irq *qi;
  52    int i;
  53
  54    qi = qemu_allocate_irqs(cpu_mips_irq_request, mips_env_get_cpu(env), 8);
  55    for (i = 0; i < 8; i++) {
  56        env->irq[i] = qi[i];
  57    }
  58}
  59
  60void cpu_mips_soft_irq(CPUMIPSState *env, int irq, int level)
  61{
  62    if (irq < 0 || irq > 2) {
  63        return;
  64    }
  65
  66    qemu_set_irq(env->irq[irq], level);
  67}
  68