projects / qemu.git / blame
| Commit | Line | Data |
|---|---|---|
| b7862564 MV |
1 | /* |
| 2 | * Altera Nios2 CPU PIC | |
| 3 | * | |
| 4 | * Copyright (c) 2016 Marek Vasut <[email protected]> | |
| 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" | |
| b7862564 MV |
22 | #include "qemu-common.h" |
| 23 | #include "cpu.h" | |
| 24 | ||
| 25 | #include "qemu/config-file.h" | |
| 26 | ||
| 27 | #include "boot.h" | |
| 28 | ||
| 29 | static 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 | ||
| 55 | void nios2_check_interrupts(CPUNios2State *env) | |
| 56 | { | |
| 57 | Nios2CPU *cpu = nios2_env_get_cpu(env); | |
| 58 | CPUState *cs = CPU(cpu); | |
| 59 | ||
| 60 | if (env->irq_pending) { | |
| 61 | env->irq_pending = 0; | |
| 62 | cpu_interrupt(cs, CPU_INTERRUPT_HARD); | |
| 63 | } | |
| 64 | } | |
| 65 | ||
| 66 | qemu_irq *nios2_cpu_pic_init(Nios2CPU *cpu) | |
| 67 | { | |
| 68 | return qemu_allocate_irqs(nios2_pic_cpu_handler, cpu, 2); | |
| 69 | } |