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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [CCS4/] [MSP430X/] [portext.asm] - Blame information for rev 595

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1 572 jeremybenn
;
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;    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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;
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;    ***************************************************************************
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;    *                                                                         *
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;    * If you are:                                                             *
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;    *                                                                         *
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;    *    + New to FreeRTOS,                                                   *
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;    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *
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;    *    + Looking for basic training,                                        *
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;    *    + Wanting to improve your FreeRTOS skills and productivity           *
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;    *                                                                         *
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;    * then take a look at the FreeRTOS books - available as PDF or paperback  *
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;    *                                                                         *
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;    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
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;    *                  http://www.FreeRTOS.org/Documentation                  *
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;    *                                                                         *
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;    * A pdf reference manual is also available.  Both are usually delivered   *
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;    * to your inbox within 20 minutes to two hours when purchased between 8am *
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;    * and 8pm GMT (although please allow up to 24 hours in case of            *
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;    * exceptional circumstances).  Thank you for your support!                *
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;    *                                                                         *
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;    ***************************************************************************
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;
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;    This file is part of the FreeRTOS distribution.
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;
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;    FreeRTOS is free software; you can redistribute it and/or modify it under
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;    the terms of the GNU General Public License (version 2) as published by the
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;    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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;    ***NOTE*** The exception to the GPL is included to allow you to distribute
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;    a combined work that includes FreeRTOS without being obliged to provide the
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;    source code for proprietary components outside of the FreeRTOS kernel.
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;    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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;    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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;    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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;    more details. You should have received a copy of the GNU General Public
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;    License and the FreeRTOS license exception along with FreeRTOS; if not it
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;    can be viewed here: http://www.freertos.org/a00114.html and also obtained
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;    by writing to Richard Barry, contact details for whom are available on the
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;    FreeRTOS WEB site.
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;
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;    1 tab == 4 spaces!
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;
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;    http://www.FreeRTOS.org - Documentation, latest information, license and
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;    contact details.
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;
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;    http://www.SafeRTOS.com - A version that is certified for use in safety
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;    critical systems.
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;
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;    http://www.OpenRTOS.com - Commercial support, development, porting,
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;    licensing and training services.
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; * The definition of the "register test" tasks, as described at the top of
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; * main.c
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        .include data_model.h
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        .global vTaskIncrementTick
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        .global vTaskSwitchContext
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        .global vPortSetupTimerInterrupt
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        .global pxCurrentTCB
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        .global usCriticalNesting
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        .def vPortPreemptiveTickISR
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        .def vPortCooperativeTickISR
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        .def vPortYield
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        .def xPortStartScheduler
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;-----------------------------------------------------------
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portSAVE_CONTEXT .macro
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        ;Save the remaining registers.
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        pushm_x #12, r15
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        mov.w   &usCriticalNesting, r14
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        push_x r14
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        mov_x   &pxCurrentTCB, r12
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        mov_x   sp, 0( r12 )
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        .endm
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;-----------------------------------------------------------
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portRESTORE_CONTEXT .macro
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        mov_x   &pxCurrentTCB, r12
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        mov_x   @r12, sp
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        pop_x   r15
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        mov.w   r15, &usCriticalNesting
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        popm_x  #12, r15
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        ;The last thing on the stack will be the status register.
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    ;Ensure the power down bits are clear ready for the next
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    ;time this power down register is popped from the stack.
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        bic.w   #0xf0, 0( sp )
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        pop.w   sr
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        ret_x
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        .endm
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;-----------------------------------------------------------
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;*
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;* The RTOS tick ISR.
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;*
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;* If the cooperative scheduler is in use this simply increments the tick
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;* count.
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;*
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;* If the preemptive scheduler is in use a context switch can also occur.
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;*/
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        .text
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        .align 2
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vPortPreemptiveTickISR: .asmfunc
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        ; The sr is not saved in portSAVE_CONTEXT() because vPortYield() needs
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        ;to save it manually before it gets modified (interrupts get disabled).
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        push.w sr
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        portSAVE_CONTEXT
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        call_x  #vTaskIncrementTick
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        call_x  #vTaskSwitchContext
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        portRESTORE_CONTEXT
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        .endasmfunc
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;-----------------------------------------------------------
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        .align 2
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vPortCooperativeTickISR: .asmfunc
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        ; The sr is not saved in portSAVE_CONTEXT() because vPortYield() needs
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        ;to save it manually before it gets modified (interrupts get disabled).
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        push.w sr
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        portSAVE_CONTEXT
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        call_x  #vTaskIncrementTick
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        portRESTORE_CONTEXT
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        .endasmfunc
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;-----------------------------------------------------------
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;
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; Manual context switch called by the portYIELD() macro.
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;
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        .align 2
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vPortYield: .asmfunc
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        ; The sr needs saving before it is modified.
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        push.w  sr
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        ; Now the SR is stacked we can disable interrupts.
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        dint
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        nop
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        ; Save the context of the current task.
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        portSAVE_CONTEXT
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        ; Select the next task to run.
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        call_x  #vTaskSwitchContext
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        ; Restore the context of the new task.
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        portRESTORE_CONTEXT
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        .endasmfunc
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;-----------------------------------------------------------
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;
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; Start off the scheduler by initialising the RTOS tick timer, then restoring
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; the context of the first task.
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;
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        .align 2
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xPortStartScheduler: .asmfunc
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        ; Setup the hardware to generate the tick.  Interrupts are disabled
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        ; when this function is called.
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        call_x  #vPortSetupTimerInterrupt
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        ; Restore the context of the first task that is going to run.
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        portRESTORE_CONTEXT
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        .endasmfunc
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;-----------------------------------------------------------
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        .end
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