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83 lines
3.6 KiB
C
83 lines
3.6 KiB
C
;/*
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; * FreeRTOS Kernel V10.3.1
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; * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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; *
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; * Permission is hereby granted, free of charge, to any person obtaining a copy of
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; * this software and associated documentation files (the "Software"), to deal in
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; * the Software without restriction, including without limitation the rights to
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; * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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; * the Software, and to permit persons to whom the Software is furnished to do so,
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; * subject to the following conditions:
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; *
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; * The above copyright notice and this permission notice shall be included in all
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; * copies or substantial portions of the Software.
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; *
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; * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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; * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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; * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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; * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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; * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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; * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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; *
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; * https://www.FreeRTOS.org
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; * https://github.com/FreeRTOS
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; *
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; * 1 tab == 4 spaces!
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; */
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#include "FreeRTOSConfig.h"
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; Variables used by scheduler
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;------------------------------------------------------------------------------
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EXTERN pxCurrentTCB
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EXTERN usCriticalNesting
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;------------------------------------------------------------------------------
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; portSAVE_CONTEXT MACRO
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; Saves the context of the general purpose registers, CS and ES (only in far
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; memory mode) registers the usCriticalNesting Value and the Stack Pointer
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; of the active Task onto the task stack
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;------------------------------------------------------------------------------
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portSAVE_CONTEXT MACRO
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PUSH AX ; Save AX Register to stack.
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PUSH HL
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MOV A, CS ; Save CS register.
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XCH A, X
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MOV A, ES ; Save ES register.
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PUSH AX
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PUSH DE ; Save the remaining general purpose registers.
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PUSH BC
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MOVW AX, usCriticalNesting ; Save the usCriticalNesting value.
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PUSH AX
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MOVW AX, pxCurrentTCB ; Save the Stack pointer.
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MOVW HL, AX
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MOVW AX, SP
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MOVW [HL], AX
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ENDM
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;------------------------------------------------------------------------------
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;------------------------------------------------------------------------------
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; portRESTORE_CONTEXT MACRO
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; Restores the task Stack Pointer then use this to restore usCriticalNesting,
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; general purpose registers and the CS and ES (only in far memory mode)
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; of the selected task from the task stack
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;------------------------------------------------------------------------------
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portRESTORE_CONTEXT MACRO
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MOVW AX, pxCurrentTCB ; Restore the Stack pointer.
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MOVW HL, AX
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MOVW AX, [HL]
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MOVW SP, AX
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POP AX ; Restore usCriticalNesting value.
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MOVW usCriticalNesting, AX
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POP BC ; Restore the necessary general purpose registers.
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POP DE
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POP AX ; Restore the ES register.
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MOV ES, A
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XCH A, X ; Restore the CS register.
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MOV CS, A
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POP HL ; Restore general purpose register HL.
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POP AX ; Restore AX.
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ENDM
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;------------------------------------------------------------------------------
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