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This commit is contained in:
Richard Barry 2006-05-28 08:17:56 +00:00
parent 416c6b9791
commit 946da76519
323 changed files with 2062 additions and 1947 deletions
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37
Source/portable/oWatcom/16BitDOS/PC/port.c
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@ -1,24 +1,24 @@
/*
FreeRTOS V4.0.1 - Copyright (C) 2003-2006 Richard Barry.
FreeRTOS.org V4.0.2 - Copyright (C) 2003-2006 Richard Barry.
This file is part of the FreeRTOS distribution.
This file is part of the FreeRTOS.org distribution.
FreeRTOS is free software; you can redistribute it and/or modify
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 is distributed in the hope that it will be useful,
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; if not, write to the Free Software
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, without being obliged to provide
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.
@ -47,6 +47,10 @@ Changes from V2.6.1
+ Replaced the sUsingPreemption variable with the configUSE_PREEMPTION
macro to be consistent with the later ports.
Changes from V4.0.1
+ Add function prvSetTickFrequencyDefault() to set the DOS tick back to
its proper value when the scheduler exits.
*/
#include <stdlib.h>
@ -93,6 +97,10 @@ is being used. */
/* Trap routine used by taskYIELD() to manually cause a context switch. */
static void __interrupt __far prvYieldProcessor( void );
/* Set the tick frequency back so the floppy drive works correctly when the
scheduler exits. */
static void prvSetTickFrequencyDefault( void );
/*lint -e956 File scopes necessary here. */
/* Used to signal when to chain to the DOS tick, and when to just clear the PIC ourselves. */
@ -251,10 +259,7 @@ void ( __interrupt __far *pxOriginalTickISR )();
/* Set the DOS tick back onto the timer ticker. */
pxOriginalTickISR = _dos_getvect( portSWITCH_INT_NUMBER + 1 );
_dos_setvect( portTIMER_INT_NUMBER, pxOriginalTickISR );
/* This won't set the frequency quite the same as it was,
but using an integer value removes the need for any floating
point in the scheduler code. */
prvSetTickFrequency( ( unsigned portLONG ) portDOS_TICK_RATE );
prvSetTickFrequencyDefault();
/* Put back the switch interrupt routines that was in place
before the scheduler started. */
@ -288,6 +293,18 @@ unsigned portLONG ulOutput;
ulOutput >>= 8;
portOUTPUT_BYTE( usPIT0, ( unsigned portSHORT ) ( ulOutput & ( unsigned portLONG ) 0xff ) );
}
/*-----------------------------------------------------------*/
static void prvSetTickFrequencyDefault( void )
{
const unsigned portSHORT usPIT_MODE = ( unsigned portSHORT ) 0x43;
const unsigned portSHORT usPIT0 = ( unsigned portSHORT ) 0x40;
const unsigned portSHORT us8254_CTR0_MODE3 = ( unsigned portSHORT ) 0x36;
portOUTPUT_BYTE( usPIT_MODE, us8254_CTR0_MODE3 );
portOUTPUT_BYTE( usPIT0,0 );
portOUTPUT_BYTE( usPIT0,0 );
}
/*lint +e950 */