/* | |
FreeRTOS V7.4.1 - Copyright (C) 2013 Real Time Engineers Ltd. | |
FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT | |
http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. | |
*************************************************************************** | |
* * | |
* FreeRTOS tutorial books are available in pdf and paperback. * | |
* Complete, revised, and edited pdf reference manuals are also * | |
* available. * | |
* * | |
* Purchasing FreeRTOS documentation will not only help you, by * | |
* ensuring you get running as quickly as possible and with an * | |
* in-depth knowledge of how to use FreeRTOS, it will also help * | |
* the FreeRTOS project to continue with its mission of providing * | |
* professional grade, cross platform, de facto standard solutions * | |
* for microcontrollers - completely free of charge! * | |
* * | |
* >>> See http://www.FreeRTOS.org/Documentation for details. <<< * | |
* * | |
* Thank you for using FreeRTOS, and 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 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. 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 Real Time Engineers Ltd., contact details for whom are available | |
on the FreeRTOS WEB site. | |
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, and our new | |
fully thread aware and reentrant UDP/IP stack. | |
http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High | |
Integrity Systems, who sell the code with commercial support, | |
indemnification and middleware, under the OpenRTOS brand. | |
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. | |
*/ | |
#include <FreeRTOSConfig.h> | |
RSEG CODE:CODE(2) | |
thumb | |
EXTERN pxCurrentTCB | |
EXTERN vTaskSwitchContext | |
PUBLIC xPortPendSVHandler | |
PUBLIC ulPortSetInterruptMask | |
PUBLIC vPortClearInterruptMask | |
PUBLIC vPortSVCHandler | |
PUBLIC vPortStartFirstTask | |
/*-----------------------------------------------------------*/ | |
xPortPendSVHandler: | |
mrs r0, psp | |
ldr r3, =pxCurrentTCB /* Get the location of the current TCB. */ | |
ldr r2, [r3] | |
stmdb r0!, {r4-r11} /* Save the remaining registers. */ | |
str r0, [r2] /* Save the new top of stack into the first member of the TCB. */ | |
stmdb sp!, {r3, r14} | |
mov r0, #configMAX_SYSCALL_INTERRUPT_PRIORITY | |
msr basepri, r0 | |
bl vTaskSwitchContext | |
mov r0, #0 | |
msr basepri, r0 | |
ldmia sp!, {r3, r14} | |
ldr r1, [r3] | |
ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */ | |
ldmia r0!, {r4-r11} /* Pop the registers. */ | |
msr psp, r0 | |
bx r14 | |
/*-----------------------------------------------------------*/ | |
ulPortSetInterruptMask: | |
mrs r0, basepri | |
mov r1, #configMAX_SYSCALL_INTERRUPT_PRIORITY | |
msr basepri, r1 | |
bx r14 | |
/*-----------------------------------------------------------*/ | |
vPortClearInterruptMask: | |
msr basepri, r0 | |
bx r14 | |
/*-----------------------------------------------------------*/ | |
vPortSVCHandler: | |
/* Get the location of the current TCB. */ | |
ldr r3, =pxCurrentTCB | |
ldr r1, [r3] | |
ldr r0, [r1] | |
/* Pop the core registers. */ | |
ldmia r0!, {r4-r11} | |
msr psp, r0 | |
mov r0, #0 | |
msr basepri, r0 | |
orr r14, r14, #13 | |
bx r14 | |
/*-----------------------------------------------------------*/ | |
vPortStartFirstTask | |
/* Use the NVIC offset register to locate the stack. */ | |
ldr r0, =0xE000ED08 | |
ldr r0, [r0] | |
ldr r0, [r0] | |
/* Set the msp back to the start of the stack. */ | |
msr msp, r0 | |
/* Call SVC to start the first task. */ | |
cpsie i | |
svc 0 | |
END | |