1/* 2 * Altera Nios2 CPU PIC 3 * 4 * Copyright (c) 2016 Marek Vasut <marek.vasut@gmail.com> 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see 18 * <http://www.gnu.org/licenses/lgpl-2.1.html> 19 */ 20 21#include "qemu/osdep.h" 22#include "qapi/error.h" 23#include "qemu-common.h" 24#include "cpu.h" 25 26#include "qemu/config-file.h" 27 28#include "boot.h" 29 30static void nios2_pic_cpu_handler(void *opaque, int irq, int level) 31{ 32 Nios2CPU *cpu = opaque; 33 CPUNios2State *env = &cpu->env; 34 CPUState *cs = CPU(cpu); 35 int type = irq ? CPU_INTERRUPT_NMI : CPU_INTERRUPT_HARD; 36 37 if (type == CPU_INTERRUPT_HARD) { 38 env->irq_pending = level; 39 40 if (level && (env->regs[CR_STATUS] & CR_STATUS_PIE)) { 41 env->irq_pending = 0; 42 cpu_interrupt(cs, type); 43 } else if (!level) { 44 env->irq_pending = 0; 45 cpu_reset_interrupt(cs, type); 46 } 47 } else { 48 if (level) { 49 cpu_interrupt(cs, type); 50 } else { 51 cpu_reset_interrupt(cs, type); 52 } 53 } 54} 55 56void nios2_check_interrupts(CPUNios2State *env) 57{ 58 Nios2CPU *cpu = nios2_env_get_cpu(env); 59 CPUState *cs = CPU(cpu); 60 61 if (env->irq_pending) { 62 env->irq_pending = 0; 63 cpu_interrupt(cs, CPU_INTERRUPT_HARD); 64 } 65} 66 67qemu_irq *nios2_cpu_pic_init(Nios2CPU *cpu) 68{ 69 return qemu_allocate_irqs(nios2_pic_cpu_handler, cpu, 2); 70} 71