/* | |
FreeRTOS V6.0.1 - Copyright (C) 2009 Real Time Engineers Ltd. | |
*************************************************************************** | |
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* "Using the FreeRTOS Real Time Kernel - a Practical Guide" * | |
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* A pdf reference manual is also available. Both are usually delivered * | |
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*************************************************************************** | |
This file is part of the FreeRTOS distribution. | |
FreeRTOS is free software; you can redistribute it and/or modify it under | |
the terms of the GNU General Public License (version 2) as published by the | |
Free Software Foundation AND MODIFIED BY the FreeRTOS exception. | |
***NOTE*** The exception to the GPL is included to allow you to distribute | |
a combined work that includes FreeRTOS without being obliged to provide the | |
source code for proprietary components outside of the FreeRTOS kernel. | |
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT | |
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
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License and the FreeRTOS license exception along with FreeRTOS; if not it | |
can be viewed here: http://www.freertos.org/a00114.html and also obtained | |
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FreeRTOS WEB site. | |
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http://www.FreeRTOS.org - Documentation, latest information, license and | |
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*/ | |
/* | |
* Purpose: Lowest level routines for all ColdFire processors. | |
* | |
* Notes: | |
* | |
* ulPortSetIPL() and mcf5xxx_wr_cacr() copied with permission from FreeScale | |
* supplied source files. | |
*/ | |
.global ulPortSetIPL | |
.global mcf5xxx_wr_cacr | |
.global __cs3_isr_interrupt_80 | |
.global vPortStartFirstTask | |
.text | |
.macro portSAVE_CONTEXT | |
lea.l (-60, %sp), %sp | |
movem.l %d0-%fp, (%sp) | |
move.l pxCurrentTCB, %a0 | |
move.l %sp, (%a0) | |
.endm | |
.macro portRESTORE_CONTEXT | |
move.l pxCurrentTCB, %a0 | |
move.l (%a0), %sp | |
movem.l (%sp), %d0-%fp | |
lea.l %sp@(60), %sp | |
rte | |
.endm | |
/********************************************************************/ | |
/* | |
* This routines changes the IPL to the value passed into the routine. | |
* It also returns the old IPL value back. | |
* Calling convention from C: | |
* old_ipl = asm_set_ipl(new_ipl); | |
* For the Diab Data C compiler, it passes return value thru D0. | |
* Note that only the least significant three bits of the passed | |
* value are used. | |
*/ | |
ulPortSetIPL: | |
link A6,#-8 | |
movem.l D6-D7,(SP) | |
move.w SR,D7 /* current sr */ | |
move.l D7,D0 /* prepare return value */ | |
andi.l #0x0700,D0 /* mask out IPL */ | |
lsr.l #8,D0 /* IPL */ | |
move.l 8(A6),D6 /* get argument */ | |
andi.l #0x07,D6 /* least significant three bits */ | |
lsl.l #8,D6 /* move over to make mask */ | |
andi.l #0x0000F8FF,D7 /* zero out current IPL */ | |
or.l D6,D7 /* place new IPL in sr */ | |
move.w D7,SR | |
movem.l (SP),D6-D7 | |
lea 8(SP),SP | |
unlk A6 | |
rts | |
/********************************************************************/ | |
mcf5xxx_wr_cacr: | |
move.l 4(sp),d0 | |
.long 0x4e7b0002 /* movec d0,cacr */ | |
nop | |
rts | |
/********************************************************************/ | |
/* Yield interrupt. */ | |
__cs3_isr_interrupt_80: | |
portSAVE_CONTEXT | |
jsr vPortYieldHandler | |
portRESTORE_CONTEXT | |
/********************************************************************/ | |
vPortStartFirstTask: | |
portRESTORE_CONTEXT | |
.end | |