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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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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 mcf5xxx_wr_cacr
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.global __cs3_isr_interrupt_80
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.global vPortStartFirstTask
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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-%fp, (%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-%fp
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lea.l %sp@(60), %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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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_cacr:
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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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__cs3_isr_interrupt_80:
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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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portRESTORE_CONTEXT
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.end
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