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 "qemu/osdep.h"
  24 #include "qemu/main-loop.h"
  25 #include "hw/irq.h"
  26 #include "hw/mips/cpudevs.h"
  27 #include "sysemu/kvm.h"
  28 #include "kvm_mips.h"
  29
  30 static void cpu_mips_irq_request(void *opaque, int irq, int level)
  31 {
  32     MIPSCPU *cpu = opaque;
  33     CPUMIPSState *env = &cpu->env;
  34     CPUState *cs = CPU(cpu);
  35     bool locked = false;
  36
  37     if (irq < 0 || irq > 7) {
  38         return;
  39     }
  40
  41     /* Make sure locking works even if BQL is already held by the caller */
  42     if (!qemu_mutex_iothread_locked()) {
  43         locked = true;
  44         qemu_mutex_lock_iothread();
  45     }
  46
  47     if (level) {
  48         env->CP0_Cause |= 1 << (irq + CP0Ca_IP);
  49     } else {
  50         env->CP0_Cause &= ~(1 << (irq + CP0Ca_IP));
  51     }
  52
  53     if (kvm_enabled() && (irq == 2 || irq == 3)) {
  54         kvm_mips_set_interrupt(cpu, irq, level);
  55     }
  56
  57     if (env->CP0_Cause & CP0Ca_IP_mask) {
  58         cpu_interrupt(cs, CPU_INTERRUPT_HARD);
  59     } else {
  60         cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
  61     }
  62
  63     if (locked) {
  64         qemu_mutex_unlock_iothread();
  65     }
  66 }
  67
  68 void cpu_mips_irq_init_cpu(MIPSCPU *cpu)
  69 {
  70     CPUMIPSState *env = &cpu->env;
  71     qemu_irq *qi;
  72     int i;
  73
  74     qi = qemu_allocate_irqs(cpu_mips_irq_request, cpu, 8);
  75     for (i = 0; i < 8; i++) {
  76         env->irq[i] = qi[i];
  77     }
  78     g_free(qi);
  79 }
  80
  81 void cpu_mips_soft_irq(CPUMIPSState *env, int irq, int level)
  82 {
  83     if (irq < 0 || irq > 2) {
  84         return;
  85     }
  86
  87     qemu_set_irq(env->irq[irq], level);
  88 }