/* | |
FreeRTOS V7.5.3 - Copyright (C) 2013 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! | |
*/ | |
#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 | |