| /**************************************************************************** |
| * arch/risc-v/src/common/riscv_doirq.c |
| * |
| * 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. |
| * |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <nuttx/config.h> |
| |
| #include <stdint.h> |
| #include <assert.h> |
| |
| #include <nuttx/irq.h> |
| #include <nuttx/addrenv.h> |
| #include <nuttx/arch.h> |
| #include <nuttx/board.h> |
| #include <arch/board/board.h> |
| #include <sched/sched.h> |
| |
| #include "riscv_internal.h" |
| |
| /**************************************************************************** |
| * Pre-processor Definitions |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Public Data |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Private Data |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Private Functions |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Public Functions |
| ****************************************************************************/ |
| |
| uintreg_t *riscv_doirq(int irq, uintreg_t *regs) |
| { |
| board_autoled_on(LED_INIRQ); |
| #ifdef CONFIG_SUPPRESS_INTERRUPTS |
| PANIC(); |
| #else |
| |
| /* NOTE: In case of ecall, we need to adjust mepc in the context */ |
| |
| if (irq >= RISCV_IRQ_ECALLU && irq <= RISCV_IRQ_ECALLM) |
| { |
| regs[REG_EPC] += 4; |
| } |
| |
| /* Current regs non-zero indicates that we are processing an interrupt; |
| * CURRENT_REGS is also used to manage interrupt level context switches. |
| * |
| * Nested interrupts are not supported |
| */ |
| |
| DEBUGASSERT(CURRENT_REGS == NULL); |
| CURRENT_REGS = regs; |
| |
| /* Deliver the IRQ */ |
| |
| irq_dispatch(irq, regs); |
| |
| /* Check for a context switch. If a context switch occurred, then |
| * CURRENT_REGS will have a different value than it did on entry. If an |
| * interrupt level context switch has occurred, then restore the floating |
| * point state and the establish the correct address environment before |
| * returning from the interrupt. |
| */ |
| |
| if (regs != CURRENT_REGS) |
| { |
| #ifdef CONFIG_ARCH_ADDRENV |
| /* Make sure that the address environment for the previously |
| * running task is closed down gracefully (data caches dump, |
| * MMU flushed) and set up the address environment for the new |
| * thread at the head of the ready-to-run list. |
| */ |
| |
| addrenv_switch(NULL); |
| #endif |
| |
| /* Record the new "running" task when context switch occurred. |
| * g_running_tasks[] is only used by assertion logic for reporting |
| * crashes. |
| */ |
| |
| g_running_tasks[this_cpu()] = this_task(); |
| |
| /* Restore the cpu lock */ |
| |
| restore_critical_section(); |
| |
| /* If a context switch occurred while processing the interrupt then |
| * CURRENT_REGS may have change value. If we return any value |
| * different from the input regs, then the lower level will know |
| * that a context switch occurred during interrupt processing. |
| */ |
| |
| regs = (uintreg_t *)CURRENT_REGS; |
| } |
| |
| /* Set CURRENT_REGS to NULL to indicate that we are no longer in an |
| * interrupt handler. |
| */ |
| |
| CURRENT_REGS = NULL; |
| |
| #endif |
| board_autoled_off(LED_INIRQ); |
| return regs; |
| } |