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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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; * 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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