| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #include "os/mynewt.h" |
| #include <env/freedom-e300-hifive1/platform.h> |
| #include <mcu/plic.h> |
| |
| interrupt_handler_t plic_interrupts[PLIC_NUM_INTERRUPTS]; |
| |
| void |
| plic_set_handler(int int_num, interrupt_handler_t handler, int priority) |
| { |
| if (int_num > 0 && int_num < PLIC_NUM_INTERRUPTS) { |
| plic_interrupts[int_num] = handler; |
| PLIC_REG(PLIC_PRIORITY_OFFSET + int_num * 4) = priority; |
| } |
| } |
| |
| void |
| plic_enable_interrupt(int int_num) |
| { |
| if (int_num > 0 && int_num < PLIC_NUM_INTERRUPTS) { |
| PLIC_REG(PLIC_ENABLE_OFFSET + 4 * (int_num / 32)) |= 1 << (int_num & 0x1F); |
| } |
| } |
| |
| void |
| plic_disable_interrupt(int int_num) |
| { |
| if (int_num > 0 && int_num < PLIC_NUM_INTERRUPTS) { |
| PLIC_REG(PLIC_ENABLE_OFFSET + 4 * (int_num / 32)) &= ~(1 << (int_num & 0x1F)); |
| } |
| } |
| |
| void |
| external_interrupt_handler(uintptr_t mcause) |
| { |
| int num = PLIC_REG(PLIC_CLAIM_OFFSET); |
| /* |
| * Interrupts have some overhead, handle all pending interrupts. |
| */ |
| while (num) { |
| /* Confirm interrupt*/ |
| PLIC_REG(PLIC_CLAIM_OFFSET) = num; |
| /* Call interrupt handler */ |
| plic_interrupts[num](num); |
| /* Check if other interupt is already pending */ |
| num = PLIC_REG(PLIC_CLAIM_OFFSET); |
| } |
| } |