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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [RVDS/] [ARM7_LPC21xx/] [portmacro.inc] - Blame information for rev 820

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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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;*/
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        IMPORT  ulCriticalNesting               ;
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        IMPORT  pxCurrentTCB                    ;
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        MACRO
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        portRESTORE_CONTEXT
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        LDR             R0, =pxCurrentTCB               ; Set the LR to the task stack.  The location was...
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        LDR             R0, [R0]                                ; ... stored in pxCurrentTCB
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        LDR             LR, [R0]
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        LDR             R0, =ulCriticalNesting  ; The critical nesting depth is the first item on...
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        LDMFD   LR!, {R1}                               ; ...the stack.  Load it into the ulCriticalNesting var.
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        STR             R1, [R0]                                ;
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        LDMFD   LR!, {R0}                               ; Get the SPSR from the stack.
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        MSR             SPSR_cxsf, R0                   ;
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        LDMFD   LR, {R0-R14}^                   ; Restore all system mode registers for the task.
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        NOP                                                             ;
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        LDR             LR, [LR, #+60]                  ; Restore the return address
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                                                                        ; And return - correcting the offset in the LR to obtain ...
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        SUBS    PC, LR, #4                              ; ...the correct address.
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        MEND
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; /**********************************************************************/
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        MACRO
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        portSAVE_CONTEXT
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        STMDB   SP!, {R0}                               ; Store R0 first as we need to use it.
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        STMDB   SP,{SP}^                                ; Set R0 to point to the task stack pointer.
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        NOP                                                             ;
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        SUB             SP, SP, #4                              ;
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        LDMIA   SP!,{R0}                                ;
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        STMDB   R0!, {LR}                               ; Push the return address onto the stack.
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        MOV             LR, R0                                  ; Now we have saved LR we can use it instead of R0.
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        LDMIA   SP!, {R0}                               ; Pop R0 so we can save it onto the system mode stack.
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        STMDB   LR,{R0-LR}^                             ; Push all the system mode registers onto the task stack.
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        NOP                                                             ;
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        SUB             LR, LR, #60                             ;
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        MRS             R0, SPSR                                ; Push the SPSR onto the task stack.
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        STMDB   LR!, {R0}                               ;
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        LDR             R0, =ulCriticalNesting  ;
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        LDR             R0, [R0]                                ;
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        STMDB   LR!, {R0}                               ;
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        LDR             R0, =pxCurrentTCB               ; Store the new top of stack for the task.
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        LDR             R1, [R0]                                ;
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        STR             LR, [R1]                                ;
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        MEND
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        END

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