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- /****************************************************************************
- * arch/risc-v/include/irq.h
- *
- * 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.
- *
- ****************************************************************************/
- /* This file should never be included directly but, rather, only indirectly
- * through nuttx/irq.h
- */
- #ifndef __ARCH_RISCV_INCLUDE_IRQ_H
- #define __ARCH_RISCV_INCLUDE_IRQ_H
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- /* Include chip-specific IRQ definitions (including IRQ numbers) */
- #include <stdint.h>
- #include <nuttx/irq.h>
- #include <arch/csr.h>
- #include <arch/chip/irq.h>
- /* Include RISC-V architecture-specific IRQ definitions */
- #if defined(CONFIG_ARCH_RV32IM) || defined(CONFIG_ARCH_RV32I)
- # include <arch/rv32im/irq.h>
- #endif
- #if defined(CONFIG_ARCH_RV64GC)
- # include <arch/rv64gc/irq.h>
- #endif
- /****************************************************************************
- * Public Types
- ****************************************************************************/
- #ifndef __ASSEMBLY__
- /****************************************************************************
- * Public Data
- ****************************************************************************/
- #undef EXTERN
- #if defined(__cplusplus)
- #define EXTERN extern "C"
- extern "C"
- {
- #else
- #define EXTERN extern
- #endif
- /****************************************************************************
- * Inline Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: up_irq_save
- *
- * Description:
- * Disable interrupts and return the previous value of the mstatus register
- *
- ****************************************************************************/
- static inline irqstate_t up_irq_save(void)
- {
- irqstate_t flags;
- /* Read mstatus & clear machine interrupt enable (MIE) in mstatus */
- __asm__ __volatile__
- (
- "csrrc %0, mstatus, %1\n"
- : "=r" (flags)
- : "r"(MSTATUS_MIE)
- : "memory"
- );
- /* Return the previous mstatus value so that it can be restored with
- * up_irq_restore().
- */
- return flags;
- }
- /****************************************************************************
- * Name: up_irq_restore
- *
- * Description:
- * Restore the value of the mstatus register
- *
- ****************************************************************************/
- static inline void up_irq_restore(irqstate_t flags)
- {
- __asm__ __volatile__
- (
- "csrw mstatus, %0\n"
- : /* no output */
- : "r" (flags)
- : "memory"
- );
- }
- /****************************************************************************
- * Public Function Prototypes
- ****************************************************************************/
- /****************************************************************************
- * Name: up_irq_enable
- *
- * Description:
- * Return the current interrupt state and enable interrupts
- *
- ****************************************************************************/
- EXTERN irqstate_t up_irq_enable(void);
- #undef EXTERN
- #if defined(__cplusplus)
- }
- #endif
- #endif /* __ASSEMBLY__ */
- #endif /* __ARCH_RISCV_INCLUDE_IRQ_H */
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