141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/****************************************************************************
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* arch/risc-v/include/irq.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* This file should never be included directly but, rather, only indirectly
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* through nuttx/irq.h
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*/
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#ifndef __ARCH_RISCV_INCLUDE_IRQ_H
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#define __ARCH_RISCV_INCLUDE_IRQ_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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/* Include chip-specific IRQ definitions (including IRQ numbers) */
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#include <stdint.h>
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#include <nuttx/irq.h>
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#include <arch/csr.h>
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#include <arch/chip/irq.h>
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/* Include RISC-V architecture-specific IRQ definitions */
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#if defined(CONFIG_ARCH_RV32IM) || defined(CONFIG_ARCH_RV32I)
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# include <arch/rv32im/irq.h>
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#endif
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#if defined(CONFIG_ARCH_RV64GC)
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# include <arch/rv64gc/irq.h>
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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#ifndef __ASSEMBLY__
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Inline Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_irq_save
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*
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* Description:
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* Disable interrupts and return the previous value of the mstatus register
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*
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****************************************************************************/
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static inline irqstate_t up_irq_save(void)
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{
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irqstate_t flags;
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/* Read mstatus & clear machine interrupt enable (MIE) in mstatus */
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__asm__ __volatile__
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(
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"csrrc %0, mstatus, %1\n"
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: "=r" (flags)
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: "r"(MSTATUS_MIE)
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: "memory"
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);
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/* Return the previous mstatus value so that it can be restored with
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* up_irq_restore().
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*/
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return flags;
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}
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/****************************************************************************
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* Name: up_irq_restore
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*
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* Description:
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* Restore the value of the mstatus register
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*
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****************************************************************************/
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static inline void up_irq_restore(irqstate_t flags)
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{
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__asm__ __volatile__
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(
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"csrw mstatus, %0\n"
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: /* no output */
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: "r" (flags)
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: "memory"
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);
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}
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: up_irq_enable
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*
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* Description:
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* Return the current interrupt state and enable interrupts
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*
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****************************************************************************/
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EXTERN irqstate_t up_irq_enable(void);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __ARCH_RISCV_INCLUDE_IRQ_H */
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