636 lines
21 KiB
C
636 lines
21 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 <nuttx/config.h>
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#include <arch/types.h>
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#ifndef __ASSEMBLY__
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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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#endif
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Map RISC-V exception code to NuttX IRQ */
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/* IRQ 0-15 : (exception:interrupt=0) */
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#define RISCV_IRQ_IAMISALIGNED (0) /* Instruction Address Misaligned */
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#define RISCV_IRQ_IAFAULT (1) /* Instruction Address Fault */
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#define RISCV_IRQ_IINSTRUCTION (2) /* Illegal Instruction */
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#define RISCV_IRQ_BPOINT (3) /* Break Point */
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#define RISCV_IRQ_LAMISALIGNED (4) /* Load Address Misaligned */
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#define RISCV_IRQ_LAFAULT (5) /* Load Access Fault */
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#define RISCV_IRQ_SAMISALIGNED (6) /* Store/AMO Address Misaligned */
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#define RISCV_IRQ_SAFAULT (7) /* Store/AMO Access Fault */
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#define RISCV_IRQ_ECALLU (8) /* Environment Call from U-mode */
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#define RISCV_IRQ_ECALLS (9) /* Environment Call from S-mode */
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#define RISCV_IRQ_ECALLH (10) /* Environment Call from H-mode */
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#define RISCV_IRQ_ECALLM (11) /* Environment Call from M-mode */
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#define RISCV_IRQ_INSTRUCTIONPF (12) /* Instruction page fault */
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#define RISCV_IRQ_LOADPF (13) /* Load page fault */
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#define RISCV_IRQ_RESERVED (14) /* Reserved */
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#define RISCV_IRQ_SROREPF (15) /* Store/AMO page fault */
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#define RISCV_MAX_EXCEPTION (15)
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/* IRQ 16- : (async event:interrupt=1) */
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#define RISCV_IRQ_ASYNC (16)
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#define RISCV_IRQ_SSOFT (RISCV_IRQ_ASYNC + 1) /* Supervisor Software Int */
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#define RISCV_IRQ_MSOFT (RISCV_IRQ_ASYNC + 3) /* Machine Software Int */
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#define RISCV_IRQ_STIMER (RISCV_IRQ_ASYNC + 5) /* Supervisor Timer Int */
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#define RISCV_IRQ_MTIMER (RISCV_IRQ_ASYNC + 7) /* Machine Timer Int */
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#define RISCV_IRQ_SEXT (RISCV_IRQ_ASYNC + 9) /* Supervisor External Int */
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#define RISCV_IRQ_MEXT (RISCV_IRQ_ASYNC + 11) /* Machine External Int */
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#define RISCV_IRQ_HPMOV (RISCV_IRQ_ASYNC + 17) /* HPM Overflow Int */
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/* IRQ bit and IRQ mask */
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#ifdef CONFIG_ARCH_RV32
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# define RISCV_IRQ_BIT (1 << 31)
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#else
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# define RISCV_IRQ_BIT (1 << 63)
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#endif
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#define RISCV_IRQ_MASK (~RISCV_IRQ_BIT)
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/* Configuration ************************************************************/
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/* If this is a kernel build, how many nested system calls should we
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* support?
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*/
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#ifndef CONFIG_SYS_NNEST
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# define CONFIG_SYS_NNEST 2
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#endif
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/* Processor PC */
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#define REG_EPC_NDX 0
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/* General pupose registers
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* $0: Zero register does not need to be saved
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* $1: ra (return address)
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*/
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#define REG_X1_NDX 1
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/* $2: Stack POinter
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* $3: Global Pointer
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* $4: Thread Pointer
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*/
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#define REG_X2_NDX 2
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#define REG_X3_NDX 3
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#define REG_X4_NDX 4
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/* $5-$7 = t0-t3: Temporary registers */
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#define REG_X5_NDX 5
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#define REG_X6_NDX 6
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#define REG_X7_NDX 7
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/* $8: s0 / fp Frame pointer */
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#define REG_X8_NDX 8
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/* $89 s1 Saved register */
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#define REG_X9_NDX 9
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/* $10-$17 = a0-a7: Argument registers */
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#define REG_X10_NDX 10
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#define REG_X11_NDX 11
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#define REG_X12_NDX 12
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#define REG_X13_NDX 13
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#define REG_X14_NDX 14
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#define REG_X15_NDX 15
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#define REG_X16_NDX 16
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#define REG_X17_NDX 17
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/* $18-$27 = s2-s11: Saved registers */
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#define REG_X18_NDX 18
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#define REG_X19_NDX 19
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#define REG_X20_NDX 20
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#define REG_X21_NDX 21
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#define REG_X22_NDX 22
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#define REG_X23_NDX 23
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#define REG_X24_NDX 24
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#define REG_X25_NDX 25
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#define REG_X26_NDX 26
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#define REG_X27_NDX 27
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/* $28-31 = t3-t6: Temporary (Volatile) registers */
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#define REG_X28_NDX 28
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#define REG_X29_NDX 29
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#define REG_X30_NDX 30
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#define REG_X31_NDX 31
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/* Interrupt Context register */
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#define REG_INT_CTX_NDX 32
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#ifdef CONFIG_ARCH_RISCV_INTXCPT_EXTREGS
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# define INT_XCPT_REGS (33 + CONFIG_ARCH_RISCV_INTXCPT_EXTREGS)
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#else
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# define INT_XCPT_REGS 33
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#endif
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#ifdef CONFIG_ARCH_RV32
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# define INT_REG_SIZE 4
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#else
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# define INT_REG_SIZE 8
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#endif
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#define INT_XCPT_SIZE (INT_REG_SIZE * INT_XCPT_REGS)
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#ifdef CONFIG_ARCH_RV32
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# if defined(CONFIG_ARCH_QPFPU)
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# define FPU_REG_SIZE 4
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# elif defined(CONFIG_ARCH_DPFPU)
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# define FPU_REG_SIZE 2
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# elif defined(CONFIG_ARCH_FPU)
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# define FPU_REG_SIZE 1
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# endif
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#else
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# if defined(CONFIG_ARCH_QPFPU)
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# define FPU_REG_SIZE 2
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# else
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# define FPU_REG_SIZE 1
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# endif
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#endif
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#ifdef CONFIG_ARCH_FPU
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# define REG_F0_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 0)
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# define REG_F1_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 1)
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# define REG_F2_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 2)
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# define REG_F3_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 3)
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# define REG_F4_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 4)
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# define REG_F5_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 5)
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# define REG_F6_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 6)
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# define REG_F7_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 7)
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# define REG_F8_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 8)
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# define REG_F9_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 9)
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# define REG_F10_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 10)
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# define REG_F11_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 11)
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# define REG_F12_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 12)
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# define REG_F13_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 13)
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# define REG_F14_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 14)
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# define REG_F15_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 15)
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# define REG_F16_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 16)
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# define REG_F17_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 17)
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# define REG_F18_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 18)
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# define REG_F19_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 19)
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# define REG_F20_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 20)
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# define REG_F21_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 21)
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# define REG_F22_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 22)
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# define REG_F23_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 23)
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# define REG_F24_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 24)
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# define REG_F25_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 25)
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# define REG_F26_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 26)
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# define REG_F27_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 27)
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# define REG_F28_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 28)
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# define REG_F29_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 29)
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# define REG_F30_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 30)
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# define REG_F31_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 31)
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# define REG_FCSR_NDX (INT_XCPT_REGS + FPU_REG_SIZE * 32)
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# define FPU_XCPT_REGS (FPU_REG_SIZE * 33)
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#else /* !CONFIG_ARCH_FPU */
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# define FPU_XCPT_REGS 0
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#endif /* CONFIG_ARCH_FPU */
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#define XCPTCONTEXT_REGS (INT_XCPT_REGS + FPU_XCPT_REGS)
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#define XCPTCONTEXT_SIZE (INT_REG_SIZE * XCPTCONTEXT_REGS)
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/* In assembly language, values have to be referenced as byte address
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* offsets. But in C, it is more convenient to reference registers as
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* register save table offsets.
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*/
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#ifdef __ASSEMBLY__
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# define REG_EPC (INT_REG_SIZE*REG_EPC_NDX)
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# define REG_X1 (INT_REG_SIZE*REG_X1_NDX)
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# define REG_X2 (INT_REG_SIZE*REG_X2_NDX)
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# define REG_X3 (INT_REG_SIZE*REG_X3_NDX)
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# define REG_X4 (INT_REG_SIZE*REG_X4_NDX)
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# define REG_X5 (INT_REG_SIZE*REG_X5_NDX)
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# define REG_X6 (INT_REG_SIZE*REG_X6_NDX)
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# define REG_X7 (INT_REG_SIZE*REG_X7_NDX)
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# define REG_X8 (INT_REG_SIZE*REG_X8_NDX)
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# define REG_X9 (INT_REG_SIZE*REG_X9_NDX)
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# define REG_X10 (INT_REG_SIZE*REG_X10_NDX)
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# define REG_X11 (INT_REG_SIZE*REG_X11_NDX)
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# define REG_X12 (INT_REG_SIZE*REG_X12_NDX)
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# define REG_X13 (INT_REG_SIZE*REG_X13_NDX)
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# define REG_X14 (INT_REG_SIZE*REG_X14_NDX)
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# define REG_X15 (INT_REG_SIZE*REG_X15_NDX)
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# define REG_X16 (INT_REG_SIZE*REG_X16_NDX)
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# define REG_X17 (INT_REG_SIZE*REG_X17_NDX)
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# define REG_X18 (INT_REG_SIZE*REG_X18_NDX)
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# define REG_X19 (INT_REG_SIZE*REG_X19_NDX)
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# define REG_X20 (INT_REG_SIZE*REG_X20_NDX)
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# define REG_X21 (INT_REG_SIZE*REG_X21_NDX)
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# define REG_X22 (INT_REG_SIZE*REG_X22_NDX)
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# define REG_X23 (INT_REG_SIZE*REG_X23_NDX)
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# define REG_X24 (INT_REG_SIZE*REG_X24_NDX)
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# define REG_X25 (INT_REG_SIZE*REG_X25_NDX)
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# define REG_X26 (INT_REG_SIZE*REG_X26_NDX)
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# define REG_X27 (INT_REG_SIZE*REG_X27_NDX)
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# define REG_X28 (INT_REG_SIZE*REG_X28_NDX)
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# define REG_X29 (INT_REG_SIZE*REG_X29_NDX)
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# define REG_X30 (INT_REG_SIZE*REG_X30_NDX)
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# define REG_X31 (INT_REG_SIZE*REG_X31_NDX)
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# define REG_INT_CTX (INT_REG_SIZE*REG_INT_CTX_NDX)
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#ifdef CONFIG_ARCH_FPU
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# define REG_F0 (INT_REG_SIZE*REG_F0_NDX)
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# define REG_F1 (INT_REG_SIZE*REG_F1_NDX)
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# define REG_F2 (INT_REG_SIZE*REG_F2_NDX)
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# define REG_F3 (INT_REG_SIZE*REG_F3_NDX)
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# define REG_F4 (INT_REG_SIZE*REG_F4_NDX)
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# define REG_F5 (INT_REG_SIZE*REG_F5_NDX)
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# define REG_F6 (INT_REG_SIZE*REG_F6_NDX)
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# define REG_F7 (INT_REG_SIZE*REG_F7_NDX)
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# define REG_F8 (INT_REG_SIZE*REG_F8_NDX)
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# define REG_F9 (INT_REG_SIZE*REG_F9_NDX)
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# define REG_F10 (INT_REG_SIZE*REG_F10_NDX)
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# define REG_F11 (INT_REG_SIZE*REG_F11_NDX)
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# define REG_F12 (INT_REG_SIZE*REG_F12_NDX)
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# define REG_F13 (INT_REG_SIZE*REG_F13_NDX)
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# define REG_F14 (INT_REG_SIZE*REG_F14_NDX)
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# define REG_F15 (INT_REG_SIZE*REG_F15_NDX)
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# define REG_F16 (INT_REG_SIZE*REG_F16_NDX)
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# define REG_F17 (INT_REG_SIZE*REG_F17_NDX)
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# define REG_F18 (INT_REG_SIZE*REG_F18_NDX)
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# define REG_F19 (INT_REG_SIZE*REG_F19_NDX)
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# define REG_F20 (INT_REG_SIZE*REG_F20_NDX)
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# define REG_F21 (INT_REG_SIZE*REG_F21_NDX)
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# define REG_F22 (INT_REG_SIZE*REG_F22_NDX)
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# define REG_F23 (INT_REG_SIZE*REG_F23_NDX)
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# define REG_F24 (INT_REG_SIZE*REG_F24_NDX)
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# define REG_F25 (INT_REG_SIZE*REG_F25_NDX)
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# define REG_F26 (INT_REG_SIZE*REG_F26_NDX)
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# define REG_F27 (INT_REG_SIZE*REG_F27_NDX)
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# define REG_F28 (INT_REG_SIZE*REG_F28_NDX)
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# define REG_F29 (INT_REG_SIZE*REG_F29_NDX)
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# define REG_F30 (INT_REG_SIZE*REG_F30_NDX)
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# define REG_F31 (INT_REG_SIZE*REG_F31_NDX)
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# define REG_FCSR (INT_REG_SIZE*REG_FCSR_NDX)
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#endif
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#else
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# define REG_EPC REG_EPC_NDX
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# define REG_X1 REG_X1_NDX
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# define REG_X2 REG_X2_NDX
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# define REG_X3 REG_X3_NDX
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# define REG_X4 REG_X4_NDX
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# define REG_X5 REG_X5_NDX
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# define REG_X6 REG_X6_NDX
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# define REG_X7 REG_X7_NDX
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# define REG_X8 REG_X8_NDX
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# define REG_X9 REG_X9_NDX
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# define REG_X10 REG_X10_NDX
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# define REG_X11 REG_X11_NDX
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# define REG_X12 REG_X12_NDX
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# define REG_X13 REG_X13_NDX
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# define REG_X14 REG_X14_NDX
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# define REG_X15 REG_X15_NDX
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# define REG_X16 REG_X16_NDX
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# define REG_X17 REG_X17_NDX
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# define REG_X18 REG_X18_NDX
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# define REG_X19 REG_X19_NDX
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# define REG_X20 REG_X20_NDX
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# define REG_X21 REG_X21_NDX
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# define REG_X22 REG_X22_NDX
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# define REG_X23 REG_X23_NDX
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# define REG_X24 REG_X24_NDX
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# define REG_X25 REG_X25_NDX
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# define REG_X26 REG_X26_NDX
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# define REG_X27 REG_X27_NDX
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# define REG_X28 REG_X28_NDX
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# define REG_X29 REG_X29_NDX
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# define REG_X30 REG_X30_NDX
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# define REG_X31 REG_X31_NDX
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# define REG_INT_CTX REG_INT_CTX_NDX
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#ifdef CONFIG_ARCH_FPU
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# define REG_F0 REG_F0_NDX
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# define REG_F1 REG_F1_NDX
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# define REG_F2 REG_F2_NDX
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# define REG_F3 REG_F3_NDX
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# define REG_F4 REG_F4_NDX
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# define REG_F5 REG_F5_NDX
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# define REG_F6 REG_F6_NDX
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# define REG_F7 REG_F7_NDX
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# define REG_F8 REG_F8_NDX
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# define REG_F9 REG_F9_NDX
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# define REG_F10 REG_F10_NDX
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# define REG_F11 REG_F11_NDX
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# define REG_F12 REG_F12_NDX
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# define REG_F13 REG_F13_NDX
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# define REG_F14 REG_F14_NDX
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# define REG_F15 REG_F15_NDX
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# define REG_F16 REG_F16_NDX
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# define REG_F17 REG_F17_NDX
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# define REG_F18 REG_F18_NDX
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# define REG_F19 REG_F19_NDX
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# define REG_F20 REG_F20_NDX
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# define REG_F21 REG_F21_NDX
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# define REG_F22 REG_F22_NDX
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# define REG_F23 REG_F23_NDX
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# define REG_F24 REG_F24_NDX
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# define REG_F25 REG_F25_NDX
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# define REG_F26 REG_F26_NDX
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# define REG_F27 REG_F27_NDX
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# define REG_F28 REG_F28_NDX
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# define REG_F29 REG_F29_NDX
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# define REG_F30 REG_F30_NDX
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# define REG_F31 REG_F31_NDX
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# define REG_FCSR REG_FCSR_NDX
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#endif
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#endif
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/* Now define more user friendly alternative name that can be used either
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* in assembly or C contexts.
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*/
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|
|
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/* $1 = ra: Return address */
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|
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#define REG_RA REG_X1
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|
|
/* $2 = sp: The value of the stack pointer on return from the exception */
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|
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#define REG_SP REG_X2
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|
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/* $3 = gp: Only needs to be saved under conditions where there are
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* multiple, per-thread values for the GP.
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*/
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|
|
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#define REG_GP REG_X3
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|
|
/* $4 = tp: Thread Pointer */
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|
|
#define REG_TP REG_X4
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|
|
/* $5-$7 = t0-t2: Caller saved temporary registers */
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|
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#define REG_T0 REG_X5
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#define REG_T1 REG_X6
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#define REG_T2 REG_X7
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|
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/* $8 = either s0 or fp: Depends if a frame pointer is used or not */
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|
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#define REG_S0 REG_X8
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#define REG_FP REG_X8
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|
|
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/* $9 = s1: Caller saved register */
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|
|
|
#define REG_S1 REG_X9
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|
|
|
/* $10-$17 = a0-a7: Argument registers */
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|
|
|
#define REG_A0 REG_X10
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|
#define REG_A1 REG_X11
|
|
#define REG_A2 REG_X12
|
|
#define REG_A3 REG_X13
|
|
#define REG_A4 REG_X14
|
|
#define REG_A5 REG_X15
|
|
#define REG_A6 REG_X16
|
|
#define REG_A7 REG_X17
|
|
|
|
/* $18-$27 = s2-s11: Callee saved registers */
|
|
|
|
#define REG_S2 REG_X18
|
|
#define REG_S3 REG_X19
|
|
#define REG_S4 REG_X20
|
|
#define REG_S5 REG_X21
|
|
#define REG_S6 REG_X22
|
|
#define REG_S7 REG_X23
|
|
#define REG_S8 REG_X24
|
|
#define REG_S9 REG_X25
|
|
#define REG_S10 REG_X26
|
|
#define REG_S11 REG_X27
|
|
|
|
/* $28-$31 = t3-t6: Caller saved temporary registers */
|
|
|
|
#define REG_T3 REG_X28
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|
#define REG_T4 REG_X29
|
|
#define REG_T5 REG_X30
|
|
#define REG_T6 REG_X31
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
/* This structure represents the return state from a system call */
|
|
|
|
#ifdef CONFIG_LIB_SYSCALL
|
|
struct xcpt_syscall_s
|
|
{
|
|
uintptr_t sysreturn; /* The return PC */
|
|
#ifndef CONFIG_BUILD_FLAT
|
|
uintptr_t int_ctx; /* Interrupt context (i.e. mstatus) */
|
|
#endif
|
|
};
|
|
#endif
|
|
|
|
/* The following structure is included in the TCB and defines the complete
|
|
* state of the thread.
|
|
*/
|
|
|
|
struct xcptcontext
|
|
{
|
|
/* The following function pointer is non-NULL if there are pending signals
|
|
* to be processed.
|
|
*/
|
|
|
|
void *sigdeliver; /* Actual type is sig_deliver_t */
|
|
|
|
/* These additional register save locations are used to implement the
|
|
* signal delivery trampoline.
|
|
*
|
|
* REVISIT: Because there is only one copy of these save areas,
|
|
* only a single signal handler can be active. This precludes
|
|
* queuing of signal actions. As a result, signals received while
|
|
* another signal handler is executing will be ignored!
|
|
*/
|
|
|
|
uintptr_t *saved_regs;
|
|
|
|
#ifndef CONFIG_BUILD_FLAT
|
|
/* This is the saved address to use when returning from a user-space
|
|
* signal handler.
|
|
*/
|
|
|
|
uintptr_t sigreturn;
|
|
#endif
|
|
|
|
#ifdef CONFIG_LIB_SYSCALL
|
|
/* The following array holds information needed to return from each nested
|
|
* system call.
|
|
*/
|
|
|
|
uint8_t nsyscalls;
|
|
struct xcpt_syscall_s syscall[CONFIG_SYS_NNEST];
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARCH_ADDRENV
|
|
#ifdef CONFIG_ARCH_KERNEL_STACK
|
|
/* In this configuration, all syscalls execute from an internal kernel
|
|
* stack. Why? Because when we instantiate and initialize the address
|
|
* environment of the new user process, we will temporarily lose the
|
|
* address environment of the old user process, including its stack
|
|
* contents. The kernel C logic will crash immediately with no valid
|
|
* stack in place.
|
|
*/
|
|
|
|
uintptr_t *ustkptr; /* Saved user stack pointer */
|
|
uintptr_t *kstack; /* Allocate base of the (aligned) kernel stack */
|
|
uintptr_t *kstkptr; /* Saved kernel stack pointer */
|
|
#endif
|
|
#endif
|
|
|
|
/* Register save area */
|
|
|
|
uintptr_t *regs;
|
|
};
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
/****************************************************************************
|
|
* 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 */
|