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 "cpu.h" 23#include "hw/irq.h" 24 25#include "qemu/config-file.h" 26 27#include "boot.h" 28 29static void nios2_pic_cpu_handler(void *opaque, int irq, int level) 30{ 31 Nios2CPU *cpu = opaque; 32 CPUNios2State *env = &cpu->env; 33 CPUState *cs = CPU(cpu); 34 int type = irq ? CPU_INTERRUPT_NMI : CPU_INTERRUPT_HARD; 35 36 if (type == CPU_INTERRUPT_HARD) { 37 env->irq_pending = level; 38 39 if (level && (env->regs[CR_STATUS] & CR_STATUS_PIE)) { 40 env->irq_pending = 0; 41 cpu_interrupt(cs, type); 42 } else if (!level) { 43 env->irq_pending = 0; 44 cpu_reset_interrupt(cs, type); 45 } 46 } else { 47 if (level) { 48 cpu_interrupt(cs, type); 49 } else { 50 cpu_reset_interrupt(cs, type); 51 } 52 } 53} 54 55void nios2_check_interrupts(CPUNios2State *env) 56{ 57 if (env->irq_pending && 58 (env->regs[CR_STATUS] & CR_STATUS_PIE)) { 59 env->irq_pending = 0; 60 cpu_interrupt(env_cpu(env), CPU_INTERRUPT_HARD); 61 } 62} 63 64qemu_irq *nios2_cpu_pic_init(Nios2CPU *cpu) 65{ 66 return qemu_allocate_irqs(nios2_pic_cpu_handler, cpu, 2); 67} 68