hw/mips/mips_int.c

   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
  27 static 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
  49 void 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
  60 void 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 }