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jeremybenn |
;/*
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; FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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;
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; ***************************************************************************
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; * *
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; * If you are: *
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; * *
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; * + New to FreeRTOS, *
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; * + Wanting to learn FreeRTOS or multitasking in general quickly *
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; * + Looking for basic training, *
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; * + Wanting to improve your FreeRTOS skills and productivity *
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; * *
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; * then take a look at the FreeRTOS books - available as PDF or paperback *
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; * *
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; * "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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; * http://www.FreeRTOS.org/Documentation *
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; * *
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; * A pdf reference manual is also available. Both are usually delivered *
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; * to your inbox within 20 minutes to two hours when purchased between 8am *
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; * and 8pm GMT (although please allow up to 24 hours in case of *
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; * exceptional circumstances). Thank you for your support! *
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; * *
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; ***************************************************************************
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;
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; This file is part of the FreeRTOS distribution.
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;
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; FreeRTOS is free software; you can redistribute it and/or modify it under
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; the terms of the GNU General Public License (version 2) as published by the
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; Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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; ***NOTE*** The exception to the GPL is included to allow you to distribute
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; a combined work that includes FreeRTOS without being obliged to provide the
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; source code for proprietary components outside of the FreeRTOS kernel.
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; FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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; more details. You should have received a copy of the GNU General Public
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; License and the FreeRTOS license exception along with FreeRTOS; if not it
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; can be viewed here: http://www.freertos.org/a00114.html and also obtained
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; by writing to Richard Barry, contact details for whom are available on the
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; FreeRTOS WEB site.
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;
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; 1 tab == 4 spaces!
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;
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; http://www.FreeRTOS.org - Documentation, latest information, license and
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; contact details.
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;
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; http://www.SafeRTOS.com - A version that is certified for use in safety
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; critical systems.
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;
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; http://www.OpenRTOS.com - Commercial support, development, porting,
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; licensing and training services.
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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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#if configMEMORY_MODE == 1
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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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#else
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MOV A, CS ; Save CS register.
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PUSH AX
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#endif
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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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#if configMEMORY_MODE == 1
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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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#else
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POP AX
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MOV CS, A ; Restore CS register.
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#endif
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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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