OpenCores
URL https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk

Subversion Repositories openrisc_2011-10-31

[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [CCS4/] [MSP430X/] [portext.asm] - Rev 572

Compare with Previous | Blame | View Log

;
;    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
;
;    ***************************************************************************
;    *                                                                         *
;    * If you are:                                                             *
;    *                                                                         *
;    *    + New to FreeRTOS,                                                   *
;    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *
;    *    + Looking for basic training,                                        *
;    *    + Wanting to improve your FreeRTOS skills and productivity           *
;    *                                                                         *
;    * then take a look at the FreeRTOS books - available as PDF or paperback  *
;    *                                                                         *
;    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
;    *                  http://www.FreeRTOS.org/Documentation                  *
;    *                                                                         *
;    * A pdf reference manual is also available.  Both are usually delivered   *
;    * to your inbox within 20 minutes to two hours when purchased between 8am *
;    * and 8pm GMT (although please allow up to 24 hours in case of            *
;    * exceptional circumstances).  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 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

        .include data_model.h

        .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_x #12, r15
        mov.w   &usCriticalNesting, r14
        push_x r14
        mov_x   &pxCurrentTCB, r12
        mov_x   sp, 0( r12 )
        .endm
;-----------------------------------------------------------
                
portRESTORE_CONTEXT .macro

        mov_x   &pxCurrentTCB, r12
        mov_x   @r12, sp
        pop_x   r15
        mov.w   r15, &usCriticalNesting
        popm_x  #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
        ret_x
        .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
        .align 2
        
vPortPreemptiveTickISR: .asmfunc
        
        ; 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
                                
        call_x  #vTaskIncrementTick
        call_x  #vTaskSwitchContext
                
        portRESTORE_CONTEXT
        .endasmfunc
;-----------------------------------------------------------

        .align 2
        
vPortCooperativeTickISR: .asmfunc
        
        ; 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
                                
        call_x  #vTaskIncrementTick
                
        portRESTORE_CONTEXT
        
        .endasmfunc
;-----------------------------------------------------------

;
; Manual context switch called by the portYIELD() macro.
;

        .align 2

vPortYield: .asmfunc

        ; 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.
        call_x  #vTaskSwitchContext             

        ; Restore the context of the new task.
        portRESTORE_CONTEXT
        .endasmfunc
;-----------------------------------------------------------


;
; Start off the scheduler by initialising the RTOS tick timer, then restoring
; the context of the first task.
;

        .align 2
        
xPortStartScheduler: .asmfunc

        ; Setup the hardware to generate the tick.  Interrupts are disabled
        ; when this function is called.
        call_x  #vPortSetupTimerInterrupt

        ; Restore the context of the first task that is going to run.
        portRESTORE_CONTEXT
        .endasmfunc
;-----------------------------------------------------------
                
        .end
                

Compare with Previous | Blame | View Log

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.