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Add MSP430X CCS4 port layer.

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Richard Barry 2011-01-01 17:23:00 +00:00
parent 2cf5546e11
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Source/portable/CCS4/MSP430X/portext.asm Normal file
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;
; FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd.
;
; ***************************************************************************
; * *
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; * *
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; * *
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; ***************************************************************************
;
; 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.
; 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 Richard Barry, contact details for whom are available on the
; FreeRTOS WEB site.
;
; 1 tab == 4 spaces!
;
; 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.
; * The definition of the "register test" tasks, as described at the top of
; * main.c
.global vTaskIncrementTick
.global vTaskSwitchContext
.global vPortSetupTimerInterrupt
.global pxCurrentTCB
.global usCriticalNesting
.def vPortPreemptiveTickISR
.def vPortCooperativeTickISR
.def vPortYield
.def xPortStartScheduler
;-----------------------------------------------------------
portSAVE_CONTEXT .macro
;Save the remaining registers.
pushm.a #12, r15
movx.w &usCriticalNesting, r14
pushx.a r14
movx.a &pxCurrentTCB, r12
movx.a sp, 0( r12 )
.endm
;-----------------------------------------------------------
portRESTORE_CONTEXT .macro
movx.a &pxCurrentTCB, r12
movx.a @r12, sp
popx.a r15
movx.w r15, &usCriticalNesting
popm.a #12, r15
;The last thing on the stack will be the status register.
;Ensure the power down bits are clear ready for the next
;time this power down register is popped from the stack.
bic.w #0xf0, 0( sp )
pop.w sr
reta
.endm
;-----------------------------------------------------------
;*
;* The RTOS tick ISR.
;*
;* If the cooperative scheduler is in use this simply increments the tick
;* count.
;*
;* If the preemptive scheduler is in use a context switch can also occur.
;*/
.text
vPortPreemptiveTickISR:
; The sr is not saved in portSAVE_CONTEXT() because vPortYield() needs
;to save it manually before it gets modified (interrupts get disabled).
push.w sr
portSAVE_CONTEXT
calla #vTaskIncrementTick
calla #vTaskSwitchContext
portRESTORE_CONTEXT
;-----------------------------------------------------------
vPortCooperativeTickISR:
; The sr is not saved in portSAVE_CONTEXT() because vPortYield() needs
;to save it manually before it gets modified (interrupts get disabled).
push.w sr
portSAVE_CONTEXT
calla #vTaskIncrementTick
calla #vTaskSwitchContext
portRESTORE_CONTEXT
;-----------------------------------------------------------
;*
;* Manual context switch called by the portYIELD() macro.
;*/
vPortYield:
; The sr needs saving before it is modified.
push.w sr
; Now the SR is stacked we can disable interrupts.
dint
nop
; Save the context of the current task.
portSAVE_CONTEXT
; Select the next task to run.
calla #vTaskSwitchContext
; Restore the context of the new task.
portRESTORE_CONTEXT
;-----------------------------------------------------------
;*
;* Start off the scheduler by initialising the RTOS tick timer, then restoring
;* the context of the first task.
;*
xPortStartScheduler:
; Setup the hardware to generate the tick. Interrupts are disabled
; when this function is called.
calla #vPortSetupTimerInterrupt
; Restore the context of the first task that is going to run.
portRESTORE_CONTEXT
;-----------------------------------------------------------
.end