;/* | |
; FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd. | |
; | |
; *************************************************************************** | |
; * * | |
; * If you are: * | |
; * * | |
; * + New to FreeRTOS, * | |
; * + Wanting to learn FreeRTOS or multitasking in general quickly * | |
; * + Looking for basic training, * | |
; * + Wanting to improve your FreeRTOS skills and productivity * | |
; * * | |
; * then take a look at the FreeRTOS books - available as PDF or paperback * | |
; * * | |
; * "Using the FreeRTOS Real Time Kernel - a Practical Guide" * | |
; * http://www.FreeRTOS.org/Documentation * | |
; * * | |
; * A pdf reference manual is also available. Both are usually delivered * | |
; * to your inbox within 20 minutes to two hours when purchased between 8am * | |
; * and 8pm GMT (although please allow up to 24 hours in case of * | |
; * exceptional circumstances). Thank you for your support! * | |
; * * | |
; *************************************************************************** | |
; | |
; This file is part of the FreeRTOS distribution. | |
; | |
; FreeRTOS is free software; you can redistribute it and/or modify it under | |
; the terms of the GNU General Public License (version 2) as published by the | |
; Free Software Foundation AND MODIFIED BY the FreeRTOS exception. | |
; ***NOTE*** The exception to the GPL is included to allow you to distribute | |
; a combined work that includes FreeRTOS without being obliged to provide the | |
; source code for proprietary components outside of the FreeRTOS kernel. | |
; FreeRTOS is distributed in the hope that it will be useful, but WITHOUT | |
; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
; more details. You should have received a copy of the GNU General Public | |
; License and the FreeRTOS license exception along with FreeRTOS; if not it | |
; can be viewed here: http://www.freertos.org/a00114.html and also obtained | |
; by writing to Richard Barry, contact details for whom are available on the | |
; FreeRTOS WEB site. | |
; | |
; 1 tab == 4 spaces! | |
; | |
; http://www.FreeRTOS.org - Documentation, latest information, license and | |
; contact details. | |
; | |
; http://www.SafeRTOS.com - A version that is certified for use in safety | |
; critical systems. | |
; | |
; http://www.OpenRTOS.com - Commercial support, development, porting, | |
; licensing and training services. | |
;*/ | |
#include "FreeRTOSConfig.h" | |
; Variables used by scheduler | |
;------------------------------------------------------------------------------ | |
EXTERN pxCurrentTCB | |
EXTERN usCriticalNesting | |
;------------------------------------------------------------------------------ | |
; portSAVE_CONTEXT MACRO | |
; Saves the context of the general purpose registers, CS and ES (only in far | |
; memory mode) registers the usCriticalNesting Value and the Stack Pointer | |
; of the active Task onto the task stack | |
;------------------------------------------------------------------------------ | |
portSAVE_CONTEXT MACRO | |
PUSH AX ; Save AX Register to stack. | |
PUSH HL | |
#if configMEMORY_MODE == 1 | |
MOV A, CS ; Save CS register. | |
XCH A, X | |
MOV A, ES ; Save ES register. | |
PUSH AX | |
#else | |
MOV A, CS ; Save CS register. | |
PUSH AX | |
#endif | |
PUSH DE ; Save the remaining general purpose registers. | |
PUSH BC | |
MOVW AX, usCriticalNesting ; Save the usCriticalNesting value. | |
PUSH AX | |
MOVW AX, pxCurrentTCB ; Save the Stack pointer. | |
MOVW HL, AX | |
MOVW AX, SP | |
MOVW [HL], AX | |
ENDM | |
;------------------------------------------------------------------------------ | |
;------------------------------------------------------------------------------ | |
; portRESTORE_CONTEXT MACRO | |
; Restores the task Stack Pointer then use this to restore usCriticalNesting, | |
; general purpose registers and the CS and ES (only in far memory mode) | |
; of the selected task from the task stack | |
;------------------------------------------------------------------------------ | |
portRESTORE_CONTEXT MACRO | |
MOVW AX, pxCurrentTCB ; Restore the Stack pointer. | |
MOVW HL, AX | |
MOVW AX, [HL] | |
MOVW SP, AX | |
POP AX ; Restore usCriticalNesting value. | |
MOVW usCriticalNesting, AX | |
POP BC ; Restore the necessary general purpose registers. | |
POP DE | |
#if configMEMORY_MODE == 1 | |
POP AX ; Restore the ES register. | |
MOV ES, A | |
XCH A, X ; Restore the CS register. | |
MOV CS, A | |
#else | |
POP AX | |
MOV CS, A ; Restore CS register. | |
#endif | |
POP HL ; Restore general purpose register HL. | |
POP AX ; Restore AX. | |
ENDM | |
;------------------------------------------------------------------------------ |