nuttx/arch/risc-v/include/mode.h

/****************************************************************************
 * arch/risc-v/include/mode.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.
 *
 ****************************************************************************/

#ifndef __ARCH_RISCV_INCLUDE_MODE_H
#define __ARCH_RISCV_INCLUDE_MODE_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>
#include <nuttx/irq.h>

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

#ifdef CONFIG_ARCH_USE_S_MODE

/* CSR definitions */

#  define CSR_STATUS        sstatus          /* Global status register */
#  define CSR_SCRATCH       sscratch         /* Scratch register */
#  define CSR_EPC           sepc             /* Exception program counter */
#  define CSR_IE            sie              /* Interrupt enable register */
#  define CSR_CAUSE         scause           /* Interrupt cause register */
#  define CSR_TVAL          stval            /* Trap value register */

/* In status register */

#  define STATUS_IE         SSTATUS_SIE      /* Global interrupt enable */
#  define STATUS_PIE        SSTATUS_SPIE     /* Previous interrupt enable */
#  define STATUS_PPP        SSTATUS_SPPS     /* Previous privilege */
#  define STATUS_SUM        SSTATUS_SUM      /* Access to user memory */

/* Interrupt bits */

#  define IE_EIE            SIE_SEIE         /* External interrupt enable */
#  define IE_SIE            SIE_SSIE         /* Software interrupt enable */
#  define IE_TIE            SIE_STIE         /* Timer interrupt enable */

/* External, timer and software interrupt */

#  define RISCV_IRQ_EXT     RISCV_IRQ_SEXT   /* PLIC IRQ */
#  define RISCV_IRQ_TIMER   RISCV_IRQ_STIMER /* Timer IRQ */
#  define RISCV_IRQ_SOFT    RISCV_IRQ_SSOFT  /* SW IRQ */

/* Define return from exception */

#  define ERET              sret

#else

/* CSR definitions */

#  define CSR_STATUS        mstatus          /* Global status register */
#  define CSR_SCRATCH       mscratch         /* Scratch register */
#  define CSR_EPC           mepc             /* Exception program counter */
#  define CSR_IE            mie              /* Interrupt enable register */
#  define CSR_CAUSE         mcause           /* Interrupt cause register */
#  define CSR_TVAL          mtval            /* Trap value register */

/* In status register */

#  define STATUS_IE         MSTATUS_MIE      /* Global interrupt enable */
#  define STATUS_PIE        MSTATUS_MPIE     /* Previous interrupt enable */
#  define STATUS_PPP        MSTATUS_MPPM     /* Previous privilege */
#  define STATUS_SUM        0                /* Not needed in M-mode */

/* Interrupt bits */

#  define IE_EIE            MIE_MEIE         /* External interrupt enable */
#  define IE_SIE            MIE_MSIE         /* Software interrupt enable */
#  define IE_TIE            MIE_MTIE         /* Timer interrupt enable */

/* External, timer and software interrupt */

#  define RISCV_IRQ_EXT     RISCV_IRQ_MEXT   /* PLIC IRQ */
#  define RISCV_IRQ_TIMER   RISCV_IRQ_MTIMER /* Timer IRQ */
#  define RISCV_IRQ_SOFT    RISCV_IRQ_MSOFT  /* SW IRQ */

/* Define return from exception */

#  define ERET              mret

#endif

#endif /* __ARCH_RISCV_INCLUDE_MODE_H */