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, cpu, 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 } 95