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/* V5.2.0 - Copyright (C) 2003-2009 Richard Barry.
This file is part of the distribution. 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. 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.
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A special exception to the GPL is included to allow you to distribute a
combined work that includes without being obliged to provide
the source code for any proprietary components. See the licensing section
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* *
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* *
* This is a concise, step by step, 'hands on' guide that describes both *
* general multitasking concepts and FreeRTOS specifics. It presents and *
* explains numerous examples that are written using the FreeRTOS API. *
* Full source code for all the examples is provided in an accompanying *
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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
.macro portSAVE_CONTEXT
lea.l (-60, %sp), %sp
movem.l %d0-%fp, (%sp)
move.l pxCurrentTCB, %a0
move.l %sp, (%a0)
move.l pxCurrentTCB, %a0
move.l (%a0), %sp
movem.l (%sp), %d0-%fp
lea.l %sp@(60), %sp
* 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.
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
move.l 4(sp),d0
.long 0x4e7b0002 /* movec d0,cacr */
/* Yield interrupt. */
jsr vPortYieldHandler