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/*
FreeRTOS.org V4.1.0 - Copyright (C) 2003-2006 Richard Barry.
This file is part of the FreeRTOS.org distribution.
FreeRTOS.org is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FreeRTOS.org 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.org; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes FreeRTOS.org, without being obliged to provide
the source code for any proprietary components. See the licensing section
of http://www.FreeRTOS.org for full details of how and when the exception
can be applied.
***************************************************************************
See http://www.FreeRTOS.org for documentation, latest information, license
and contact details. Please ensure to read the configuration and relevant
port sections of the online documentation.
***************************************************************************
*/
#include <FreeRTOSConfig.h>
RSEG ICODE:CODE
EXTERN vPortYieldFromISR
EXTERN vTaskSwitchContext
EXTERN vTaskIncrementTick
EXTERN uxCriticalNesting
EXTERN pxCurrentTCB
PUBLIC vSetPSP
PUBLIC vSetMSP
PUBLIC xPortPendSVHandler
PUBLIC xPortSysTickHandler
vSetPSP:
msr psp, r0
bx lr
/*-----------------------------------------------------------*/
vSetMSP
msr msp, r0
bx lr
/*-----------------------------------------------------------*/
xPortPendSVHandler:
mrs r0, psp
cbz r0, no_save
/* Save the context into the TCB. */
sub r0, r0, #0x20
stm r0, {r4-r11}
nop
sub r0, r0, #0x04
ldr r1, =uxCriticalNesting
ldr r1, [r1]
str R1, [r0, #0x00]
ldr r1, =pxCurrentTCB
ldr r1, [r1]
str r0, [r1]
no_save:
ldr r0, =vTaskSwitchContext
push {r14}
cpsid i
blx r0
cpsie i
pop {r14}
/* Restore the context. */
ldr r1, =pxCurrentTCB
ldr r1, [r1]
ldr r0, [r1]
ldm r0, {r1, r4-r11}
nop
ldr r2, =uxCriticalNesting
str r1, [r2]
add r0, r0, #0x24
msr psp, r0
orr r14, r14, #0xd
/* Exit with interrupts in the state required by the task. */
cbnz r1, sv_disable_interrupts
bx r14
sv_disable_interrupts:
cpsid i
bx r14
/*-----------------------------------------------------------*/
xPortSysTickHandler:
/* Call the scheduler tick function. */
ldr r0, =vTaskIncrementTick
push {r14}
cpsid i
blx r0
cpsie i
pop {r14}
/* If using preemption, also force a context switch. */
#if configUSE_PREEMPTION == 1
push {r14}
ldr r0, =vPortYieldFromISR
blx r0
pop {r14}
#endif
/* Exit with interrupts in the correct state. */
ldr r2, =uxCriticalNesting
ldr r2, [r2]
cbnz r2, tick_disable_interrupts
bx r14
tick_disable_interrupts:
cpsid i
bx r14
END
/*-----------------------------------------------------------*/
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