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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [IAR/] [STR91x/] [ISR_Support.h] - 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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    * 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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    This file is part of the FreeRTOS distribution.
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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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    1 tab == 4 spaces!
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    http://www.FreeRTOS.org - Documentation, latest information, license and
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    contact details.
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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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    http://www.OpenRTOS.com - Commercial support, development, porting,
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    licensing and training services.
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*/
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        EXTERN pxCurrentTCB
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        EXTERN ulCriticalNesting
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Context save and restore macro definitions
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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portSAVE_CONTEXT MACRO
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        ; Push R0 as we are going to use the register.
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        STMDB   SP!, {R0}
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        ; Set R0 to point to the task stack pointer.
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        STMDB   SP, {SP}^
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        NOP
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        SUB             SP, SP, #4
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        LDMIA   SP!, {R0}
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        ; Push the return address onto the stack.
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        STMDB   R0!, {LR}
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        ; Now we have saved LR we can use it instead of R0.
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        MOV             LR, R0
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        ; Pop R0 so we can save it onto the system mode stack.
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        LDMIA   SP!, {R0}
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        ; Push all the system mode registers onto the task stack.
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        STMDB   LR, {R0-LR}^
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        NOP
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        SUB             LR, LR, #60
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        ; Push the SPSR onto the task stack.
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        MRS             R0, SPSR
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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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        ; Store the new top of stack for the task.
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        LDR             R1, =pxCurrentTCB
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        LDR             R0, [R1]
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        STR             LR, [R0]
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        ENDM
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portRESTORE_CONTEXT MACRO
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        ; Set the LR to the task stack.
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        LDR             R1, =pxCurrentTCB
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        LDR             R0, [R1]
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        LDR             LR, [R0]
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        ; The critical nesting depth is the first item on the stack.
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        ; Load it into the ulCriticalNesting variable.
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        LDR             R0, =ulCriticalNesting
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        LDMFD   LR!, {R1}
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        STR             R1, [R0]
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        ; Get the SPSR from the stack.
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        LDMFD   LR!, {R0}
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        MSR             SPSR_cxsf, R0
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        ; Restore all system mode registers for the task.
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        LDMFD   LR, {R0-R14}^
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        NOP
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        ; Restore the return address.
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        LDR             LR, [LR, #+60]
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        ; And return - correcting the offset in the LR to obtain the
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        ; correct address.
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        SUBS    PC, LR, #4
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        ENDM
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