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 "cpu.h"
  28 #include "sysemu/kvm.h"
  29 #include "kvm_mips.h"
  30
  31 static void cpu_mips_irq_request(void *opaque, int irq, int level)
  32 {
  33     MIPSCPU *cpu = opaque;
  34     CPUMIPSState *env = &cpu->env;
  35     CPUState *cs = CPU(cpu);
  36     bool locked = false;
  37
  38     if (irq < 0 || irq > 7) {
  39         return;
  40     }
  41
  42     /* Make sure locking works even if BQL is already held by the caller */
  43     if (!qemu_mutex_iothread_locked()) {
  44         locked = true;
  45         qemu_mutex_lock_iothread();
  46     }
  47
  48     if (level) {
  49         env->CP0_Cause |= 1 << (irq + CP0Ca_IP);
  50
  51         if (kvm_enabled() && irq == 2) {
  52             kvm_mips_set_interrupt(cpu, irq, level);
  53         }
  54
  55     } else {
  56         env->CP0_Cause &= ~(1 << (irq + CP0Ca_IP));
  57
  58         if (kvm_enabled() && irq == 2) {
  59             kvm_mips_set_interrupt(cpu, irq, level);
  60         }
  61     }
  62
  63     if (env->CP0_Cause & CP0Ca_IP_mask) {
  64         cpu_interrupt(cs, CPU_INTERRUPT_HARD);
  65     } else {
  66         cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
  67     }
  68
  69     if (locked) {
  70         qemu_mutex_unlock_iothread();
  71     }
  72 }
  73
  74 void cpu_mips_irq_init_cpu(MIPSCPU *cpu)
  75 {
  76     CPUMIPSState *env = &cpu->env;
  77     qemu_irq *qi;
  78     int i;
  79
  80     qi = qemu_allocate_irqs(cpu_mips_irq_request, env_archcpu(env), 8);
  81     for (i = 0; i < 8; i++) {
  82         env->irq[i] = qi[i];
  83     }
  84     g_free(qi);
  85 }
  86
  87 void cpu_mips_soft_irq(CPUMIPSState *env, int irq, int level)
  88 {
  89     if (irq < 0 || irq > 2) {
  90         return;
  91     }
  92
  93     qemu_set_irq(env->irq[irq], level);
  94 }