blob: 4005ba64ce43809a909ac4edf4287d208378fcb9 [file] [log] [blame]
/*
FreeRTOS V5.4.2 - Copyright (C) 2009 Real Time Engineers Ltd.
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 exception 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.
Alternative commercial license and support terms are also available upon
request. See the licensing section of http://www.FreeRTOS.org for full
license details.
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 along
with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
Temple Place, Suite 330, Boston, MA 02111-1307 USA.
***************************************************************************
* *
* Looking for a quick start? Then check out the FreeRTOS eBook! *
* See http://www.FreeRTOS.org/Documentation for details *
* *
***************************************************************************
1 tab == 4 spaces!
Please ensure to read the configuration and relevant port sections of the
online documentation.
http://www.FreeRTOS.org - Documentation, latest information, license and
contact details.
http://www.SafeRTOS.com - A version that is certified for use in safety
critical systems.
http://www.OpenRTOS.com - Commercial support, development, porting,
licensing and training services.
*/
/*
Change from V4.2.1:
+ Introduced usage of configKERNEL_INTERRUPT_PRIORITY macro to set the
interrupt priority used by the kernel.
*/
#include <FreeRTOSConfig.h>
/* For backward compatibility, ensure configKERNEL_INTERRUPT_PRIORITY is
defined. The value zero should also ensure backward compatibility.
FreeRTOS.org versions prior to V4.3.0 did not include this definition. */
#ifndef configKERNEL_INTERRUPT_PRIORITY
#define configKERNEL_INTERRUPT_PRIORITY 0
#endif
RSEG CODE:CODE(2)
thumb
EXTERN vPortYieldFromISR
EXTERN pxCurrentTCB
EXTERN vTaskSwitchContext
PUBLIC vSetMSP
PUBLIC xPortPendSVHandler
PUBLIC vPortSetInterruptMask
PUBLIC vPortClearInterruptMask
PUBLIC vPortSVCHandler
PUBLIC vPortStartFirstTask
/*-----------------------------------------------------------*/
vSetMSP
msr msp, r0
bx lr
/*-----------------------------------------------------------*/
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
/*-----------------------------------------------------------*/
vPortSetInterruptMask:
push { r0 }
mov R0, #configMAX_SYSCALL_INTERRUPT_PRIORITY
msr BASEPRI, R0
pop { R0 }
bx r14
/*-----------------------------------------------------------*/
vPortClearInterruptMask:
PUSH { r0 }
MOV R0, #0
MSR BASEPRI, R0
POP { R0 }
bx r14
/*-----------------------------------------------------------*/
vPortSVCHandler;
ldr r3, =pxCurrentTCB
ldr r1, [r3]
ldr r0, [r1]
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. */
svc 0
END