70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
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/*
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* Altera Nios2 CPU PIC
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*
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* Copyright (c) 2016 Marek Vasut <marek.vasut@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see
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* <http://www.gnu.org/licenses/lgpl-2.1.html>
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "cpu.h"
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#include "qemu/config-file.h"
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#include "boot.h"
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static void nios2_pic_cpu_handler(void *opaque, int irq, int level)
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{
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Nios2CPU *cpu = opaque;
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CPUNios2State *env = &cpu->env;
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CPUState *cs = CPU(cpu);
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int type = irq ? CPU_INTERRUPT_NMI : CPU_INTERRUPT_HARD;
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if (type == CPU_INTERRUPT_HARD) {
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env->irq_pending = level;
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if (level && (env->regs[CR_STATUS] & CR_STATUS_PIE)) {
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env->irq_pending = 0;
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cpu_interrupt(cs, type);
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} else if (!level) {
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env->irq_pending = 0;
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cpu_reset_interrupt(cs, type);
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}
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} else {
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if (level) {
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cpu_interrupt(cs, type);
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} else {
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cpu_reset_interrupt(cs, type);
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}
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}
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}
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void nios2_check_interrupts(CPUNios2State *env)
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{
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Nios2CPU *cpu = nios2_env_get_cpu(env);
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CPUState *cs = CPU(cpu);
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if (env->irq_pending) {
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env->irq_pending = 0;
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cpu_interrupt(cs, CPU_INTERRUPT_HARD);
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}
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}
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qemu_irq *nios2_cpu_pic_init(Nios2CPU *cpu)
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{
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return qemu_allocate_irqs(nios2_pic_cpu_handler, cpu, 2);
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}
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