356 lines
11 KiB
C
356 lines
11 KiB
C
/****************************************************************************
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* arch/risc-v/include/rv64gc/irq.h
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*
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* Copyright (C) 2011, 2013, 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Modified for RISC-V:
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*
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* Copyright (C) 2016 Ken Pettit. All rights reserved.
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* Author: Ken Pettit <pettitkd@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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_RV64GC_IRQ_H
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#define __ARCH_RISCV_INCLUDE_RV64GC_IRQ_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <arch/types.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* If this is a kernel build, how many nested system calls should we support? */
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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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#define XCPTCONTEXT_REGS 33
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#define XCPTCONTEXT_SIZE (8*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 (8*REG_EPC_NDX)
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# define REG_X1 (8*REG_X1_NDX)
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# define REG_X2 (8*REG_X2_NDX)
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# define REG_X3 (8*REG_X3_NDX)
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# define REG_X4 (8*REG_X4_NDX)
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# define REG_X5 (8*REG_X5_NDX)
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# define REG_X6 (8*REG_X6_NDX)
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# define REG_X7 (8*REG_X7_NDX)
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# define REG_X8 (8*REG_X8_NDX)
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# define REG_X9 (8*REG_X9_NDX)
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# define REG_X10 (8*REG_X10_NDX)
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# define REG_X11 (8*REG_X11_NDX)
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# define REG_X12 (8*REG_X12_NDX)
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# define REG_X13 (8*REG_X13_NDX)
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# define REG_X14 (8*REG_X14_NDX)
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# define REG_X15 (8*REG_X15_NDX)
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# define REG_X16 (8*REG_X16_NDX)
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# define REG_X17 (8*REG_X17_NDX)
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# define REG_X18 (8*REG_X18_NDX)
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# define REG_X19 (8*REG_X19_NDX)
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# define REG_X20 (8*REG_X20_NDX)
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# define REG_X21 (8*REG_X21_NDX)
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# define REG_X22 (8*REG_X22_NDX)
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# define REG_X23 (8*REG_X23_NDX)
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# define REG_X24 (8*REG_X24_NDX)
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# define REG_X25 (8*REG_X25_NDX)
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# define REG_X26 (8*REG_X26_NDX)
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# define REG_X27 (8*REG_X27_NDX)
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# define REG_X28 (8*REG_X28_NDX)
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# define REG_X29 (8*REG_X29_NDX)
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# define REG_X30 (8*REG_X30_NDX)
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# define REG_X31 (8*REG_X31_NDX)
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# define REG_INT_CTX (8*REG_INT_CTX_NDX)
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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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#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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/* $1 = ra: Return address */
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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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#define REG_SP REG_X2
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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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#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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#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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/* $8 = either s0 or fp: Depends if a frame pointer is used or not */
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#define REG_S0 REG_X8
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#define REG_FP REG_X8
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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
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#define REG_A2 REG_X12
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#define REG_A3 REG_X13
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#define REG_A4 REG_X14
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#define REG_A5 REG_X15
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#define REG_A6 REG_X16
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#define REG_A7 REG_X17
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/* $18-$27 = s2-s11: Callee saved registers */
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#define REG_S2 REG_X18
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#define REG_S3 REG_X19
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#define REG_S4 REG_X20
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#define REG_S5 REG_X21
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#define REG_S6 REG_X22
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#define REG_S7 REG_X23
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#define REG_S8 REG_X24
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#define REG_S9 REG_X25
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#define REG_S10 REG_X26
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#define REG_S11 REG_X27
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/* $28-$31 = t3-t6: Caller saved temporary registers */
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#define REG_T3 REG_X28
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#define REG_T4 REG_X29
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#define REG_T5 REG_X30
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#define REG_T6 REG_X31
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/****************************************************************************
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* Public Types
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****************************************************************************/
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#ifndef __ASSEMBLY__
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/* This structure represents the return state from a system call */
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#ifdef CONFIG_LIB_SYSCALL
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struct xcpt_syscall_s
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{
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uint64_t sysreturn; /* The return PC */
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#ifdef CONFIG_BUILD_PROTECTED
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uint64_t int_ctx; /* Interrupt context (i.e. mstatus) */
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#endif
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};
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#endif
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/* The following structure is included in the TCB and defines the complete
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* state of the thread.
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*/
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struct xcptcontext
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{
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/* The following function pointer is non-NULL if there are pending signals
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* to be processed.
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*/
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void *sigdeliver; /* Actual type is sig_deliver_t */
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/* These additional register save locations are used to implement the
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* signal delivery trampoline.
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*
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* REVISIT: Because there is only one copy of these save areas,
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* only a single signal handler can be active. This precludes
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* queuing of signal actions. As a result, signals received while
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* another signal handler is executing will be ignored!
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*/
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uint64_t saved_epc; /* Trampoline PC */
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uint64_t saved_int_ctx; /* Interrupt context with interrupts disabled. */
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#ifdef CONFIG_BUILD_PROTECTED
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/* This is the saved address to use when returning from a user-space
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* signal handler.
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*/
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uint32_t sigreturn;
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#endif
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#ifdef CONFIG_LIB_SYSCALL
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/* The following array holds information needed to return from each nested
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* system call.
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*/
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uint8_t nsyscalls;
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struct xcpt_syscall_s syscall[CONFIG_SYS_NNEST];
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#endif
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/* Register save area */
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uint64_t regs[XCPTCONTEXT_REGS];
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};
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#endif /* __ASSEMBLY__ */
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#endif /* __ARCH_RISCV_INCLUDE_RV64GC_IRQ_H */
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