/* | |
FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd. | |
All rights reserved | |
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. | |
*************************************************************************** | |
* * | |
* FreeRTOS provides completely free yet professionally developed, * | |
* robust, strictly quality controlled, supported, and cross * | |
* platform software that has become a de facto standard. * | |
* * | |
* Help yourself get started quickly and support the FreeRTOS * | |
* project by purchasing a FreeRTOS tutorial book, reference * | |
* manual, or both from: http://www.FreeRTOS.org/Documentation * | |
* * | |
* Thank you! * | |
* * | |
*************************************************************************** | |
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 modification 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. Full license text is available from the following | |
link: http://www.freertos.org/a00114.html | |
1 tab == 4 spaces! | |
*************************************************************************** | |
* * | |
* Having a problem? Start by reading the FAQ "My application does * | |
* not run, what could be wrong?" * | |
* * | |
* http://www.FreeRTOS.org/FAQHelp.html * | |
* * | |
*************************************************************************** | |
http://www.FreeRTOS.org - Documentation, books, training, latest versions, | |
license and Real Time Engineers Ltd. contact details. | |
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
including FreeRTOS+Trace - an indispensable productivity tool, a DOS | |
compatible FAT file system, and our tiny thread aware UDP/IP stack. | |
http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High | |
Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS | |
licenses offer ticketed support, indemnification and middleware. | |
http://www.SafeRTOS.com - High Integrity Systems also provide a safety | |
engineered and independently SIL3 certified version for use in safety and | |
mission critical applications that require provable dependability. | |
1 tab == 4 spaces! | |
*/ | |
/* 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 | |
*/ | |
.macro portSAVE_CONTEXT | |
SEL RB0 | |
/* Save AX Register to stack. */ | |
PUSH AX | |
PUSH HL | |
/* Save CS register. */ | |
MOV A, CS | |
XCH A, X | |
/* Save ES register. */ | |
MOV A, ES | |
PUSH AX | |
/* Save the remaining general purpose registers from bank 0. */ | |
PUSH DE | |
PUSH BC | |
/* Save the other register banks - only necessary in the GCC port. */ | |
SEL RB1 | |
PUSH AX | |
PUSH BC | |
PUSH DE | |
PUSH HL | |
SEL RB2 | |
PUSH AX | |
PUSH BC | |
PUSH DE | |
PUSH HL | |
/* Registers in bank 3 are for ISR use only so don't need saving. */ | |
SEL RB0 | |
/* Save the usCriticalNesting value. */ | |
MOVW AX, !_usCriticalNesting | |
PUSH AX | |
/* Save the Stack pointer. */ | |
MOVW AX, !_pxCurrentTCB | |
MOVW HL, AX | |
MOVW AX, SP | |
MOVW [HL], AX | |
/* Switch stack pointers. */ | |
movw sp,#_stack /* Set stack pointer */ | |
.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 | |
*/ | |
.macro portRESTORE_CONTEXT MACRO | |
SEL RB0 | |
/* Restore the Stack pointer. */ | |
MOVW AX, !_pxCurrentTCB | |
MOVW HL, AX | |
MOVW AX, [HL] | |
MOVW SP, AX | |
/* Restore usCriticalNesting value. */ | |
POP AX | |
MOVW !_usCriticalNesting, AX | |
/* Restore the alternative register banks - only necessary in the GCC | |
port. Register bank 3 is dedicated for interrupts use so is not saved or | |
restored. */ | |
SEL RB2 | |
POP HL | |
POP DE | |
POP BC | |
POP AX | |
SEL RB1 | |
POP HL | |
POP DE | |
POP BC | |
POP AX | |
SEL RB0 | |
/* Restore the necessary general purpose registers. */ | |
POP BC | |
POP DE | |
/* Restore the ES register. */ | |
POP AX | |
MOV ES, A | |
/* Restore the CS register. */ | |
XCH A, X | |
MOV CS, A | |
/* Restore general purpose register HL. */ | |
POP HL | |
/* Restore AX. */ | |
POP AX | |
.endm | |