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Richard Barry 2008-02-13 10:36:35 +00:00
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263
20080212/Source/portable/BCC/16BitDOS/Flsh186/port.c Normal file
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/*
FreeRTOS.org V4.7.1 - 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.
***************************************************************************
Please ensure to read the configuration and relevant port sections of the
online documentation.
+++ http://www.FreeRTOS.org +++
Documentation, latest information, license and contact details.
+++ http://www.SafeRTOS.com +++
A version that is certified for use in safety critical systems.
+++ http://www.OpenRTOS.com +++
Commercial support, development, porting, licensing and training services.
***************************************************************************
*/
/*
Changes from V1.00:
+ Call to taskYIELD() from within tick ISR has been replaced by the more
efficient portSWITCH_CONTEXT().
+ ISR function definitions renamed to include the prv prefix.
Changes from V2.6.1
+ Replaced the sUsingPreemption variable with the configUSE_PREEMPTION
macro to be consistent with the later ports.
*/
/*-----------------------------------------------------------
* Implementation of functions defined in portable.h for the Flashlite 186
* port.
*----------------------------------------------------------*/
#include <dos.h>
#include <stdlib.h>
#include <setjmp.h>
#include "FreeRTOS.h"
#include "task.h"
#include "portasm.h"
/*lint -e950 Non ANSI reserved words okay in this file only. */
#define portTIMER_EOI_TYPE ( 8 )
#define portRESET_PIC() portOUTPUT_WORD( ( unsigned portSHORT ) 0xff22, portTIMER_EOI_TYPE )
#define portTIMER_INT_NUMBER 0x12
#define portTIMER_1_CONTROL_REGISTER ( ( unsigned portSHORT ) 0xff5e )
#define portTIMER_0_CONTROL_REGISTER ( ( unsigned portSHORT ) 0xff56 )
#define portTIMER_INTERRUPT_ENABLE ( ( unsigned portSHORT ) 0x2000 )
/* Setup the hardware to generate the required tick frequency. */
static void prvSetTickFrequency( unsigned portLONG ulTickRateHz );
/* Set the hardware back to the state as per before the scheduler started. */
static void prvExitFunction( void );
/* The ISR used depends on whether the preemptive or cooperative scheduler
is being used. */
#if( configUSE_PREEMPTION == 1 )
/* Tick service routine used by the scheduler when preemptive scheduling is
being used. */
static void __interrupt __far prvPreemptiveTick( void );
#else
/* Tick service routine used by the scheduler when cooperative scheduling is
being used. */
static void __interrupt __far prvNonPreemptiveTick( void );
#endif
/* Trap routine used by taskYIELD() to manually cause a context switch. */
static void __interrupt __far prvYieldProcessor( void );
/*lint -e956 File scopes necessary here. */
/* Set true when the vectors are set so the scheduler will service the tick. */
static portBASE_TYPE xSchedulerRunning = pdFALSE;
/* Points to the original routine installed on the vector we use for manual
context switches. This is then used to restore the original routine during
prvExitFunction(). */
static void ( __interrupt __far *pxOldSwitchISR )();
/* Used to restore the original DOS context when the scheduler is ended. */
static jmp_buf xJumpBuf;
/*lint +e956 */
/*-----------------------------------------------------------*/
portBASE_TYPE xPortStartScheduler( void )
{
/* This is called with interrupts already disabled. */
/* Remember what was on the interrupts we are going to use
so we can put them back later if required. */
pxOldSwitchISR = _dos_getvect( portSWITCH_INT_NUMBER );
/* Put our manual switch (yield) function on a known
vector. */
_dos_setvect( portSWITCH_INT_NUMBER, prvYieldProcessor );
#if( configUSE_PREEMPTION == 1 )
{
/* Put our tick switch function on the timer interrupt. */
_dos_setvect( portTIMER_INT_NUMBER, prvPreemptiveTick );
}
#else
{
/* We want the timer interrupt to just increment the tick count. */
_dos_setvect( portTIMER_INT_NUMBER, prvNonPreemptiveTick );
}
#endif
prvSetTickFrequency( configTICK_RATE_HZ );
/* Clean up function if we want to return to DOS. */
if( setjmp( xJumpBuf ) != 0 )
{
prvExitFunction();
xSchedulerRunning = pdFALSE;
}
else
{
xSchedulerRunning = pdTRUE;
/* Kick off the scheduler by setting up the context of the first task. */
portFIRST_CONTEXT();
}
return xSchedulerRunning;
}
/*-----------------------------------------------------------*/
/* The ISR used depends on whether the preemptive or cooperative scheduler
is being used. */
#if( configUSE_PREEMPTION == 1 )
static void __interrupt __far prvPreemptiveTick( void )
{
/* Get the scheduler to update the task states following the tick. */
vTaskIncrementTick();
/* Switch in the context of the next task to be run. */
portSWITCH_CONTEXT();
/* Reset the PIC ready for the next time. */
portRESET_PIC();
}
#else
static void __interrupt __far prvNonPreemptiveTick( void )
{
/* Same as preemptive tick, but the cooperative scheduler is being used
so we don't have to switch in the context of the next task. */
vTaskIncrementTick();
portRESET_PIC();
}
#endif
/*-----------------------------------------------------------*/
static void __interrupt __far prvYieldProcessor( void )
{
/* Switch in the context of the next task to be run. */
portSWITCH_CONTEXT();
}
/*-----------------------------------------------------------*/
void vPortEndScheduler( void )
{
/* Jump back to the processor state prior to starting the
scheduler. This means we are not going to be using a
task stack frame so the task can be deleted. */
longjmp( xJumpBuf, 1 );
}
/*-----------------------------------------------------------*/
static void prvExitFunction( void )
{
const unsigned portSHORT usTimerDisable = 0x0000;
unsigned portSHORT usTimer0Control;
/* Interrupts should be disabled here anyway - but no
harm in making sure. */
portDISABLE_INTERRUPTS();
if( xSchedulerRunning == pdTRUE )
{
/* Put back the switch interrupt routines that was in place
before the scheduler started. */
_dos_setvect( portSWITCH_INT_NUMBER, pxOldSwitchISR );
}
/* Disable the timer used for the tick to ensure the scheduler is
not called before restoring interrupts. There was previously nothing
on this timer so there is no old ISR to restore. */
portOUTPUT_WORD( portTIMER_1_CONTROL_REGISTER, usTimerDisable );
/* Restart the DOS tick. */
usTimer0Control = portINPUT_WORD( portTIMER_0_CONTROL_REGISTER );
usTimer0Control |= portTIMER_INTERRUPT_ENABLE;
portOUTPUT_WORD( portTIMER_0_CONTROL_REGISTER, usTimer0Control );
portENABLE_INTERRUPTS();
/* This will free up all the memory used by the scheduler.
exiting back to dos with INT21 AH=4CH will do this anyway so
it is not necessary to call this. */
vTaskCleanUpResources();
}
/*-----------------------------------------------------------*/
static void prvSetTickFrequency( unsigned portLONG ulTickRateHz )
{
const unsigned portSHORT usMaxCountRegister = 0xff5a;
const unsigned portSHORT usTimerPriorityRegister = 0xff32;
const unsigned portSHORT usTimerEnable = 0xC000;
const unsigned portSHORT usRetrigger = 0x0001;
const unsigned portSHORT usTimerHighPriority = 0x0000;
unsigned portSHORT usTimer0Control;
/* ( CPU frequency / 4 ) / clock 2 max count [inpw( 0xff62 ) = 7] */
const unsigned portLONG ulClockFrequency = ( unsigned portLONG ) 0x7f31a0UL;
unsigned portLONG ulTimerCount = ulClockFrequency / ulTickRateHz;
portOUTPUT_WORD( portTIMER_1_CONTROL_REGISTER, usTimerEnable | portTIMER_INTERRUPT_ENABLE | usRetrigger );
portOUTPUT_WORD( usMaxCountRegister, ( unsigned portSHORT ) ulTimerCount );
portOUTPUT_WORD( usTimerPriorityRegister, usTimerHighPriority );
/* Stop the DOS tick - don't do this if you want to maintain a TOD clock. */
usTimer0Control = portINPUT_WORD( portTIMER_0_CONTROL_REGISTER );
usTimer0Control &= ~portTIMER_INTERRUPT_ENABLE;
portOUTPUT_WORD( portTIMER_0_CONTROL_REGISTER, usTimer0Control );
}
/*lint +e950 */

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/*
FreeRTOS.org V4.7.1 - 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.
***************************************************************************
Please ensure to read the configuration and relevant port sections of the
online documentation.
+++ http://www.FreeRTOS.org +++
Documentation, latest information, license and contact details.
+++ http://www.SafeRTOS.com +++
A version that is certified for use in safety critical systems.
+++ http://www.OpenRTOS.com +++
Commercial support, development, porting, licensing and training services.
***************************************************************************
*/
#ifndef PORTMACRO_H
#define PORTMACRO_H
/*-----------------------------------------------------------
* Port specific definitions.
*
* The settings in this file configure FreeRTOS correctly for the
* given hardware and compiler.
*
* These settings should not be altered.
*-----------------------------------------------------------
*/
/* Type definitions. */
#define portCHAR char
#define portFLOAT float
#define portDOUBLE long
#define portLONG long
#define portSHORT int
#define portSTACK_TYPE unsigned portSHORT
#define portBASE_TYPE portSHORT
#if( configUSE_16_BIT_TICKS == 1 )
typedef unsigned portSHORT portTickType;
#define portMAX_DELAY ( portTickType ) 0xffff
#else
typedef unsigned portLONG portTickType;
#define portMAX_DELAY ( portTickType ) 0xffffffff
#endif
/*-----------------------------------------------------------*/
/* Critical section handling. */
#define portENTER_CRITICAL() __asm{ pushf } \
__asm{ cli } \
#define portEXIT_CRITICAL() __asm{ popf }
#define portDISABLE_INTERRUPTS() __asm{ cli }
#define portENABLE_INTERRUPTS() __asm{ sti }
/*-----------------------------------------------------------*/
/* Hardware specifics. */
#define portNOP() __asm{ nop }
#define portSTACK_GROWTH ( -1 )
#define portSWITCH_INT_NUMBER 0x80
#define portYIELD() __asm{ int portSWITCH_INT_NUMBER }
#define portTICK_RATE_MS ( ( portTickType ) 1000 / configTICK_RATE_HZ )
#define portBYTE_ALIGNMENT 2
#define portINITIAL_SW ( ( portSTACK_TYPE ) 0x0202 ) /* Start the tasks with interrupts enabled. */
/*-----------------------------------------------------------*/
/* Compiler specifics. */
#define portINPUT_BYTE( xAddr ) inp( xAddr )
#define portOUTPUT_BYTE( xAddr, ucValue ) outp( xAddr, ucValue )
#define portINPUT_WORD( xAddr ) inpw( xAddr )
#define portOUTPUT_WORD( xAddr, usValue ) outpw( xAddr, usValue )
#define inline
/*-----------------------------------------------------------*/
/* Task function macros as described on the FreeRTOS.org WEB site. */
#define portTASK_FUNCTION_PROTO( vTaskFunction, vParameters ) void vTaskFunction( void *pvParameters )
#define portTASK_FUNCTION( vTaskFunction, vParameters ) void vTaskFunction( void *pvParameters )
#endif /* PORTMACRO_H */

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/*
FreeRTOS.org V4.7.1 - 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.
***************************************************************************
Please ensure to read the configuration and relevant port sections of the
online documentation.
+++ http://www.FreeRTOS.org +++
Documentation, latest information, license and contact details.
+++ http://www.SafeRTOS.com +++
A version that is certified for use in safety critical systems.
+++ http://www.OpenRTOS.com +++
Commercial support, development, porting, licensing and training services.
***************************************************************************
*/
/*
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>
#include <dos.h>
#include <setjmp.h>
#include "FreeRTOS.h"
#include "task.h"
#include "portasm.h"
/*-----------------------------------------------------------
* Implementation of functions defined in portable.h for the industrial
* PC port.
*----------------------------------------------------------*/
/*lint -e950 Non ANSI reserved words okay in this file only. */
#define portTIMER_INT_NUMBER 0x08
/* Setup hardware for required tick interrupt rate. */
static void prvSetTickFrequency( unsigned portLONG ulTickRateHz );
/* Restore hardware to as it was prior to starting the scheduler. */
static void prvExitFunction( void );
/* Either chain to the DOS tick (which itself clears the PIC) or clear the PIC
directly. We chain to the DOS tick as close as possible to the standard DOS
tick rate. */
static void prvPortResetPIC( void );
/* The ISR used depends on whether the preemptive or cooperative
scheduler is being used. */
#if( configUSE_PREEMPTION == 1 )
/* Tick service routine used by the scheduler when preemptive scheduling is
being used. */
static void __interrupt __far prvPreemptiveTick( void );
#else
/* Tick service routine used by the scheduler when cooperative scheduling is
being used. */
static void __interrupt __far prvNonPreemptiveTick( void );
#endif
/* 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. */
static portSHORT sDOSTickCounter;
/* Set true when the vectors are set so the scheduler will service the tick. */
static portBASE_TYPE xSchedulerRunning = pdFALSE;
/* Points to the original routine installed on the vector we use for manual context switches. This is then used to restore the original routine during prvExitFunction(). */
static void ( __interrupt __far *pxOldSwitchISR )();
/* Points to the original routine installed on the vector we use to chain to the DOS tick. This is then used to restore the original routine during prvExitFunction(). */
static void ( __interrupt __far *pxOldSwitchISRPlus1 )();
/* Used to restore the original DOS context when the scheduler is ended. */
static jmp_buf xJumpBuf;
/*lint +e956 */
/*-----------------------------------------------------------*/
portBASE_TYPE xPortStartScheduler( void )
{
pxISR pxOriginalTickISR;
/* This is called with interrupts already disabled. */
/* Remember what was on the interrupts we are going to use
so we can put them back later if required. */
pxOldSwitchISR = _dos_getvect( portSWITCH_INT_NUMBER );
pxOriginalTickISR = _dos_getvect( portTIMER_INT_NUMBER );
pxOldSwitchISRPlus1 = _dos_getvect( portSWITCH_INT_NUMBER + 1 );
prvSetTickFrequency( configTICK_RATE_HZ );
/* Put our manual switch (yield) function on a known
vector. */
_dos_setvect( portSWITCH_INT_NUMBER, prvYieldProcessor );
/* Put the old tick on a different interrupt number so we can
call it when we want. */
_dos_setvect( portSWITCH_INT_NUMBER + 1, pxOriginalTickISR );
/* The ISR used depends on whether the preemptive or cooperative
scheduler is being used. */
#if( configUSE_PREEMPTION == 1 )
{
/* Put our tick switch function on the timer interrupt. */
_dos_setvect( portTIMER_INT_NUMBER, prvPreemptiveTick );
}
#else
{
/* We want the timer interrupt to just increment the tick count. */
_dos_setvect( portTIMER_INT_NUMBER, prvNonPreemptiveTick );
}
#endif
/* Setup a counter that is used to call the DOS interrupt as close
to it's original frequency as can be achieved given our chosen tick
frequency. */
sDOSTickCounter = portTICKS_PER_DOS_TICK;
/* Clean up function if we want to return to DOS. */
if( setjmp( xJumpBuf ) != 0 )
{
prvExitFunction();
xSchedulerRunning = pdFALSE;
}
else
{
xSchedulerRunning = pdTRUE;
/* Kick off the scheduler by setting up the context of the first task. */
portFIRST_CONTEXT();
}
return xSchedulerRunning;
}
/*-----------------------------------------------------------*/
/* The ISR used depends on whether the preemptive or cooperative
scheduler is being used. */
#if( configUSE_PREEMPTION == 1 )
static void __interrupt __far prvPreemptiveTick( void )
{
/* Get the scheduler to update the task states following the tick. */
vTaskIncrementTick();
/* Switch in the context of the next task to be run. */
portSWITCH_CONTEXT();
/* Reset the PIC ready for the next time. */
prvPortResetPIC();
}
#else
static void __interrupt __far prvNonPreemptiveTick( void )
{
/* Same as preemptive tick, but the cooperative scheduler is being used
so we don't have to switch in the context of the next task. */
vTaskIncrementTick();
prvPortResetPIC();
}
#endif
/*-----------------------------------------------------------*/
static void __interrupt __far prvYieldProcessor( void )
{
/* Switch in the context of the next task to be run. */
portSWITCH_CONTEXT();
}
/*-----------------------------------------------------------*/
static void prvPortResetPIC( void )
{
/* We are going to call the DOS tick interrupt at as close a
frequency to the normal DOS tick as possible. */
/* WE SHOULD NOT DO THIS IF YIELD WAS CALLED. */
--sDOSTickCounter;
if( sDOSTickCounter <= 0 )
{
sDOSTickCounter = ( portSHORT ) portTICKS_PER_DOS_TICK;
__asm{ int portSWITCH_INT_NUMBER + 1 };
}
else
{
/* Reset the PIC as the DOS tick is not being called to
do it. */
__asm
{
mov al, 20H
out 20H, al
};
}
}
/*-----------------------------------------------------------*/
void vPortEndScheduler( void )
{
/* Jump back to the processor state prior to starting the
scheduler. This means we are not going to be using a
task stack frame so the task can be deleted. */
longjmp( xJumpBuf, 1 );
}
/*-----------------------------------------------------------*/
static void prvExitFunction( void )
{
void ( __interrupt __far *pxOriginalTickISR )();
/* Interrupts should be disabled here anyway - but no
harm in making sure. */
portDISABLE_INTERRUPTS();
if( xSchedulerRunning == pdTRUE )
{
/* Set the DOS tick back onto the timer ticker. */
pxOriginalTickISR = _dos_getvect( portSWITCH_INT_NUMBER + 1 );
_dos_setvect( portTIMER_INT_NUMBER, pxOriginalTickISR );
prvSetTickFrequencyDefault();
/* Put back the switch interrupt routines that was in place
before the scheduler started. */
_dos_setvect( portSWITCH_INT_NUMBER, pxOldSwitchISR );
_dos_setvect( portSWITCH_INT_NUMBER + 1, pxOldSwitchISRPlus1 );
}
/* The tick timer is back how DOS wants it. We can re-enable
interrupts without the scheduler being called. */
portENABLE_INTERRUPTS();
/* This will free up all the memory used by the scheduler.
exiting back to dos with INT21 AH=4CH will do this anyway so
it is not necessary to call this. */
vTaskCleanUpResources();
}
/*-----------------------------------------------------------*/
static void prvSetTickFrequency( unsigned portLONG ulTickRateHz )
{
const unsigned portSHORT usPIT_MODE = ( unsigned portSHORT ) 0x43;
const unsigned portSHORT usPIT0 = ( unsigned portSHORT ) 0x40;
const unsigned portLONG ulPIT_CONST = ( unsigned portLONG ) 1193180UL;
const unsigned portSHORT us8254_CTR0_MODE3 = ( unsigned portSHORT ) 0x36;
unsigned portLONG ulOutput;
/* Setup the 8245 to tick at the wanted frequency. */
portOUTPUT_BYTE( usPIT_MODE, us8254_CTR0_MODE3 );
ulOutput = ulPIT_CONST / ulTickRateHz;
portOUTPUT_BYTE( usPIT0, ( unsigned portSHORT )( ulOutput & ( unsigned portLONG ) 0xff ) );
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 */

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/*
FreeRTOS.org V4.7.1 - 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.
***************************************************************************
Please ensure to read the configuration and relevant port sections of the
online documentation.
+++ http://www.FreeRTOS.org +++
Documentation, latest information, license and contact details.
+++ http://www.SafeRTOS.com +++
A version that is certified for use in safety critical systems.
+++ http://www.OpenRTOS.com +++
Commercial support, development, porting, licensing and training services.
***************************************************************************
*/
#ifndef PORTMACRO_H
#define PORTMACRO_H
/*-----------------------------------------------------------
* Port specific definitions.
*
* The settings in this file configure FreeRTOS correctly for the
* given hardware and compiler.
*
* These settings should not be altered.
*-----------------------------------------------------------
*/
/* Type definitions. */
#define portCHAR char
#define portFLOAT long
#define portDOUBLE long
#define portLONG long
#define portSHORT int
#define portSTACK_TYPE unsigned portSHORT
#define portBASE_TYPE portSHORT
#if( configUSE_16_BIT_TICKS == 1 )
typedef unsigned portSHORT portTickType;
#define portMAX_DELAY ( portTickType ) 0xffff
#else
typedef unsigned portLONG portTickType;
#define portMAX_DELAY ( portTickType ) 0xffffffff
#endif
/*-----------------------------------------------------------*/
/* Critical section management. */
#define portENTER_CRITICAL() __asm{ pushf } \
__asm{ cli } \
#define portEXIT_CRITICAL() __asm{ popf }
#define portDISABLE_INTERRUPTS() __asm{ cli }
#define portENABLE_INTERRUPTS() __asm{ sti }
/*-----------------------------------------------------------*/
/* Hardware specifics. */
#define portNOP() __asm{ nop }
#define portSTACK_GROWTH ( -1 )
#define portSWITCH_INT_NUMBER 0x80
#define portYIELD() __asm{ int portSWITCH_INT_NUMBER }
#define portDOS_TICK_RATE ( 18.20648 )
#define portTICK_RATE_MS ( ( portTickType ) 1000 / configTICK_RATE_HZ )
#define portTICKS_PER_DOS_TICK ( ( unsigned portSHORT ) ( ( ( portDOUBLE ) configTICK_RATE_HZ / portDOS_TICK_RATE ) + 0.5 ) )
#define portINITIAL_SW ( ( portSTACK_TYPE ) 0x0202 ) /* Start the tasks with interrupts enabled. */
/*-----------------------------------------------------------*/
/* Compiler specifics. */
#define portINPUT_BYTE( xAddr ) inp( xAddr )
#define portOUTPUT_BYTE( xAddr, ucValue ) outp( xAddr, ucValue )
#define inline
/*-----------------------------------------------------------*/
/* Task function macros as described on the FreeRTOS.org WEB site. */
#define portTASK_FUNCTION_PROTO( vTaskFunction, pvParameters ) void vTaskFunction( void *pvParameters )
#define portTASK_FUNCTION( vTaskFunction, pvParameters ) void vTaskFunction( void *pvParameters )
#endif /* PORTMACRO_H */

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/*
FreeRTOS.org V4.7.1 - 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.
***************************************************************************
Please ensure to read the configuration and relevant port sections of the
online documentation.
+++ http://www.FreeRTOS.org +++
Documentation, latest information, license and contact details.
+++ http://www.SafeRTOS.com +++
A version that is certified for use in safety critical systems.
+++ http://www.OpenRTOS.com +++
Commercial support, development, porting, licensing and training services.
***************************************************************************
*/
#ifndef PORT_ASM_H
#define PORT_ASM_H
typedef void tskTCB;
extern volatile tskTCB * volatile pxCurrentTCB;
extern void vTaskSwitchContext( void );
/*
* Saves the stack pointer for one task into its TCB, calls
* vTaskSwitchContext() to update the TCB being used, then restores the stack
* from the new TCB read to run the task.
*/
void portSWITCH_CONTEXT( void );
/*
* Load the stack pointer from the TCB of the task which is going to be first
* to execute. Then force an IRET so the registers and IP are popped off the
* stack.
*/
void portFIRST_CONTEXT( void );
/* There are slightly different versions depending on whether you are building
to include debugger information. If debugger information is used then there
are a couple of extra bytes left of the ISR stack (presumably for use by the
debugger). The true stack pointer is then stored in the bp register. We add
2 to the stack pointer to remove the extra bytes before we restore our context. */
#define portSWITCH_CONTEXT() \
asm { mov ax, seg pxCurrentTCB } \
asm { mov ds, ax } \
asm { les bx, pxCurrentTCB } /* Save the stack pointer into the TCB. */ \
asm { mov es:0x2[ bx ], ss } \
asm { mov es:[ bx ], sp } \
asm { call far ptr vTaskSwitchContext } /* Perform the switch. */ \
asm { mov ax, seg pxCurrentTCB } /* Restore the stack pointer from the TCB. */ \
asm { mov ds, ax } \
asm { les bx, dword ptr pxCurrentTCB } \
asm { mov ss, es:[ bx + 2 ] } \
asm { mov sp, es:[ bx ] }
#define portFIRST_CONTEXT() \
__asm { mov ax, seg pxCurrentTCB } \
__asm { mov ds, ax } \
__asm { les bx, dword ptr pxCurrentTCB } \
__asm { mov ss, es:[ bx + 2 ] } \
__asm { mov sp, es:[ bx ] } \
__asm { pop bp } \
__asm { pop di } \
__asm { pop si } \
__asm { pop ds } \
__asm { pop es } \
__asm { pop dx } \
__asm { pop cx } \
__asm { pop bx } \
__asm { pop ax } \
__asm { iret }
#endif

135
20080212/Source/portable/BCC/16BitDOS/common/portcomn.c Normal file
View file

@ -0,0 +1,135 @@
/*
FreeRTOS.org V4.7.1 - 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.
***************************************************************************
Please ensure to read the configuration and relevant port sections of the
online documentation.
+++ http://www.FreeRTOS.org +++
Documentation, latest information, license and contact details.
+++ http://www.SafeRTOS.com +++
A version that is certified for use in safety critical systems.
+++ http://www.OpenRTOS.com +++
Commercial support, development, porting, licensing and training services.
***************************************************************************
*/
/*
Changes from V1.00:
+ pxPortInitialiseStack() now initialises the stack of new tasks to the
same format used by the compiler. This allows the compiler generated
interrupt mechanism to be used for context switches.
Changes from V2.6.1
+ Move usPortCheckFreeStackSpace() to tasks.c.
*/
#include <dos.h>
#include <stdlib.h>
#include "FreeRTOS.h"
/*-----------------------------------------------------------*/
/* See header file for description. */
portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
{
portSTACK_TYPE DS_Reg = 0;
/* Place a few bytes of known values on the bottom of the stack.
This is just useful for debugging. */
*pxTopOfStack = 0x1111;
pxTopOfStack--;
*pxTopOfStack = 0x2222;
pxTopOfStack--;
*pxTopOfStack = 0x3333;
pxTopOfStack--;
*pxTopOfStack = 0x4444;
pxTopOfStack--;
*pxTopOfStack = 0x5555;
pxTopOfStack--;
/*lint -e950 -e611 -e923 Lint doesn't like this much - but nothing I can do about it. */
/* We are going to start the scheduler using a return from interrupt
instruction to load the program counter, so first there would be the
function call with parameters preamble. */
*pxTopOfStack = FP_SEG( pvParameters );
pxTopOfStack--;
*pxTopOfStack = FP_OFF( pvParameters );
pxTopOfStack--;
*pxTopOfStack = FP_SEG( pxCode );
pxTopOfStack--;
*pxTopOfStack = FP_OFF( pxCode );
pxTopOfStack--;
/* Next the status register and interrupt return address. */
*pxTopOfStack = portINITIAL_SW;
pxTopOfStack--;
*pxTopOfStack = FP_SEG( pxCode );
pxTopOfStack--;
*pxTopOfStack = FP_OFF( pxCode );
pxTopOfStack--;
/* The remaining registers would be pushed on the stack by our context
switch function. These are loaded with values simply to make debugging
easier. */
*pxTopOfStack = ( portSTACK_TYPE ) 0xAAAA; /* AX */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0xBBBB; /* BX */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0xCCCC; /* CX */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0xDDDD; /* DX */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0xEEEE; /* ES */
pxTopOfStack--;
/* We need the true data segment. */
__asm{ MOV DS_Reg, DS };
*pxTopOfStack = DS_Reg; /* DS */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x0123; /* SI */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0xDDDD; /* DI */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0xBBBB; /* BP */
/*lint +e950 +e611 +e923 */
return pxTopOfStack;
}
/*-----------------------------------------------------------*/