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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [CodeWarrior/] [ColdFire_V2/] [portasm.S] - 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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/*
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 * Purpose: Lowest level routines for all ColdFire processors.
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 *
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 * Notes:
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 *
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 * ulPortSetIPL() and mcf5xxx_wr_cacr() copied with permission from FreeScale
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 * supplied source files.
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 */
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    .global ulPortSetIPL
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    .global _ulPortSetIPL
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    .global mcf5xxx_wr_cacrx
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    .global _mcf5xxx_wr_cacrx
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    .global vPortYieldISR
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    .global _vPortYieldISR
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    .global vPortStartFirstTask
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    .global _vPortStartFirstTask
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    .extern _pxCurrentTCB
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    .extern _vPortYieldHandler
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    .text
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.macro portSAVE_CONTEXT
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        lea.l           (-60, sp), sp
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        movem.l         d0-a6, (sp)
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        move.l          _pxCurrentTCB, a0
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        move.l          sp, (a0)
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        .endm
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.macro portRESTORE_CONTEXT
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        move.l          _pxCurrentTCB, a0
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        move.l          (a0), sp
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        movem.l         (sp), d0-a6
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        lea.l           (60, sp), sp
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        rte
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        .endm
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/********************************************************************/
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/*
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 * This routines changes the IPL to the value passed into the routine.
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 * It also returns the old IPL value back.
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 * Calling convention from C:
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 *   old_ipl = asm_set_ipl(new_ipl);
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 * For the Diab Data C compiler, it passes return value thru D0.
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 * Note that only the least significant three bits of the passed
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 * value are used.
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 */
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ulPortSetIPL:
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_ulPortSetIPL:
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    link    A6,#-8
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    movem.l D6-D7,(SP)
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    move.w  SR,D7       /* current sr    */
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    move.l  D7,D0       /* prepare return value  */
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    andi.l  #0x0700,D0  /* mask out IPL  */
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    lsr.l   #8,D0       /* IPL   */
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    move.l  8(A6),D6    /* get argument  */
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    andi.l  #0x07,D6    /* least significant three bits  */
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    lsl.l   #8,D6       /* move over to make mask    */
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    andi.l  #0x0000F8FF,D7  /* zero out current IPL  */
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    or.l    D6,D7           /* place new IPL in sr   */
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    move.w  D7,SR
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    movem.l (SP),D6-D7
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    lea     8(SP),SP
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    unlk    A6
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    rts
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/********************************************************************/
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mcf5xxx_wr_cacrx:
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_mcf5xxx_wr_cacrx:
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    move.l  4(sp),d0
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    .long   0x4e7b0002  /* movec d0,cacr   */
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    nop
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    rts
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/********************************************************************/
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/* Yield interrupt. */
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_vPortYieldISR:
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vPortYieldISR:
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        portSAVE_CONTEXT
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        jsr _vPortYieldHandler
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        portRESTORE_CONTEXT
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/********************************************************************/
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vPortStartFirstTask:
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_vPortStartFirstTask:
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        portRESTORE_CONTEXT
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    .end
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