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/hw.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 /* 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 50 if (kvm_enabled() && irq == 2) { 51 kvm_mips_set_interrupt(cpu, irq, level); 52 } 53 54 } else { 55 env->CP0_Cause &= ~(1 << (irq + CP0Ca_IP)); 56 57 if (kvm_enabled() && irq == 2) { 58 kvm_mips_set_interrupt(cpu, irq, level); 59 } 60 } 61 62 if (env->CP0_Cause & CP0Ca_IP_mask) { 63 cpu_interrupt(cs, CPU_INTERRUPT_HARD); 64 } else { 65 cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); 66 } 67 68 if (locked) { 69 qemu_mutex_unlock_iothread(); 70 } 71 } 72 73 void cpu_mips_irq_init_cpu(MIPSCPU *cpu) 74 { 75 CPUMIPSState *env = &cpu->env; 76 qemu_irq *qi; 77 int i; 78 79 qi = qemu_allocate_irqs(cpu_mips_irq_request, env_archcpu(env), 8); 80 for (i = 0; i < 8; i++) { 81 env->irq[i] = qi[i]; 82 } 83 } 84 85 void cpu_mips_soft_irq(CPUMIPSState *env, int irq, int level) 86 { 87 if (irq < 0 || irq > 2) { 88 return; 89 } 90 91 qemu_set_irq(env->irq[irq], level); 92 } 93