; FreeRTOS.org V5.1.2 - Copyright (C) 2003-2009 Richard Barry. | |
; | |
; This file is part of the FreeRTOS.org distribution. | |
; | |
; FreeRTOS.org is free software; you can redistribute it and/or modify | |
; it under the terms of the GNU General Public License as published by | |
; the Free Software Foundation; either version 2 of the License, or | |
; (at your option) any later version. | |
; | |
; FreeRTOS.org 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 | |
; along with FreeRTOS.org; if not, write to the Free Software | |
; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
; | |
; A special exception to the GPL can be applied should you wish to distribute | |
; a combined work that includes FreeRTOS.org, without being obliged to provide | |
; the source code for any proprietary components. See the licensing section | |
; of http://www.FreeRTOS.org for full details of how and when the exception | |
; can be applied. | |
; | |
; *************************************************************************** | |
; See http://www.FreeRTOS.org for documentation, latest information, license | |
; and contact details. Please ensure to read the configuration and relevant | |
; port sections of the online documentation. | |
; *************************************************************************** | |
; | |
;------------------------------------------------------------------------------ | |
#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 | |
;------------------------------------------------------------------------------ |