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127 lines
3.4 KiB
C
127 lines
3.4 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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/* Variables used by scheduler */
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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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.macro portSAVE_CONTEXT
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SEL RB0
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/* Save AX Register to stack. */
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PUSH AX
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PUSH HL
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/* Save CS register. */
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MOV A, CS
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XCH A, X
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/* Save ES register. */
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MOV A, ES
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PUSH AX
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/* Save the remaining general purpose registers from bank 0. */
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PUSH DE
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PUSH BC
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/* Save the other register banks - only necessary in the GCC port. */
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SEL RB1
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PUSH AX
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PUSH BC
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PUSH DE
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PUSH HL
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SEL RB2
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PUSH AX
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PUSH BC
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PUSH DE
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PUSH HL
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/* Registers in bank 3 are for ISR use only so don't need saving. */
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SEL RB0
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/* Save the usCriticalNesting value. */
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MOVW AX, !_usCriticalNesting
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PUSH AX
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/* Save the Stack pointer. */
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MOVW AX, !_pxCurrentTCB
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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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/* Switch stack pointers. */
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movw sp,#_stack /* Set stack pointer */
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.endm
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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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.macro portRESTORE_CONTEXT MACRO
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SEL RB0
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/* Restore the Stack pointer. */
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MOVW AX, !_pxCurrentTCB
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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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/* Restore usCriticalNesting value. */
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POP AX
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MOVW !_usCriticalNesting, AX
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/* Restore the alternative register banks - only necessary in the GCC
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port. Register bank 3 is dedicated for interrupts use so is not saved or
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restored. */
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SEL RB2
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POP HL
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POP DE
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POP BC
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POP AX
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SEL RB1
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POP HL
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POP DE
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POP BC
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POP AX
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SEL RB0
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/* Restore the necessary general purpose registers. */
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POP BC
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POP DE
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/* Restore the ES register. */
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POP AX
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MOV ES, A
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/* Restore the CS register. */
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XCH A, X
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MOV CS, A
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/* Restore general purpose register HL. */
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POP HL
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/* Restore AX. */
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POP AX
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.endm
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