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112 lines
3.5 KiB
C
112 lines
3.5 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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* ; * http://www.FreeRTOS.org
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* ; * http://aws.amazon.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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;
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Variables used by scheduler
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;
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------------------------------------------------------------------------------
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EXTERN pxCurrentTCB
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EXTERN usCriticalNesting
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;
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------------------------------------------------------------------------------
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;
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portSAVE_CONTEXT MACRO
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;
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Saves the context of the general purpose registers, CS and ES( only in far
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;
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memory mode ) registers the usCriticalNesting Value and the Stack Pointer
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;
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of the active Task onto the task stack
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;
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------------------------------------------------------------------------------
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portSAVE_CONTEXT MACRO
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PUSH AX;
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Save AX Register to stack.
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PUSH HL
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MOV A, CS;
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Save CS register.
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XCH A, X
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MOV A, ES;
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Save ES register.
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PUSH AX
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PUSH DE;
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Save the remaining general purpose registers.
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PUSH BC
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MOVW AX, usCriticalNesting;
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Save the usCriticalNesting value.
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PUSH AX
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MOVW AX, pxCurrentTCB;
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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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;
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------------------------------------------------------------------------------
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;
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portRESTORE_CONTEXT MACRO
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;
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Restores the task Stack Pointer then use this to restore usCriticalNesting,
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;
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general purpose registers and the CS and ES( only in far memory mode )
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;
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of the selected task from the task stack
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;
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------------------------------------------------------------------------------
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portRESTORE_CONTEXT MACRO
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MOVW AX, pxCurrentTCB;
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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;
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Restore usCriticalNesting value.
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MOVW usCriticalNesting, AX
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POP BC;
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Restore the necessary general purpose registers.
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POP DE
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POP AX;
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Restore the ES register.
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MOV ES, A
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XCH A, X;
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Restore the CS register.
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MOV CS, A
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POP HL;
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Restore general purpose register HL.
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POP AX;
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Restore AX.
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ENDM
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;
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------------------------------------------------------------------------------
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