/* | |
FreeRTOS.org V5.1.0 - Copyright (C) 2003-2008 Richard Barry. | |
This file is part of the FreeRTOS.org distribution. | |
FreeRTOS.org is free software; you can redistribute it and/or modify | |
it under the terms of the GNU General Public License as published by | |
the Free Software Foundation; either version 2 of the License, or | |
(at your option) any later version. | |
FreeRTOS.org 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 more details. | |
You should have received a copy of the GNU General Public License | |
along with FreeRTOS.org; if not, write to the Free Software | |
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
A special exception to the GPL can be applied should you wish to distribute | |
a combined work that includes FreeRTOS.org, without being obliged to provide | |
the source code for any proprietary components. See the licensing section | |
of http://www.FreeRTOS.org for full details of how and when the exception | |
can be applied. | |
*************************************************************************** | |
*************************************************************************** | |
* * | |
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Please ensure to read the configuration and relevant port sections of the | |
online documentation. | |
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 | |