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Alfred Gedeon 2020-07-01 22:27:40 -07:00 • committed by alfred gedeon
parent a5dbc2b1de
commit 718178c68a
406 changed files with 108795 additions and 106323 deletions
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341
portable/oWatcom/16BitDOS/PC/port.c
View file

@ -25,27 +25,27 @@
*/
/*
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+ Call to taskYIELD() from within tick ISR has been replaced by the more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 V1.2.0:
+ prvPortResetPIC() is now called last thing before the end of the
preemptive tick routine.
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.
*/
* 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+ Call to taskYIELD() from within tick ISR has been replaced by the more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 V1.2.0:
+
+ prvPortResetPIC() is now called last thing before the end of the
+ preemptive tick routine.
+
+ 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 <stdio.h>
@ -58,13 +58,13 @@ Changes from V4.0.1
#include "portasm.h"
/*-----------------------------------------------------------
* Implementation of functions defined in portable.h for the industrial
* PC port.
*----------------------------------------------------------*/
* 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
#define portTIMER_INT_NUMBER 0x08
/* Setup hardware for required tick interrupt rate. */
static void prvSetTickFrequency( uint32_t ulTickRateHz );
@ -73,41 +73,43 @@ static void prvSetTickFrequency( uint32_t ulTickRateHz );
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. */
* directly. We chain to the DOS tick as close as possible to the standard DOS
* tick rate. */
static void prvPortResetPIC( void );
/* The tick ISR used depends on whether the preemptive or cooperative scheduler
is being used. */
* 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 );
/* 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 );
/* 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. */
* 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 int16_t sDOSTickCounter;
static int16_t sDOSTickCounter;
/* Set true when the vectors are set so the scheduler will service the tick. */
static int16_t sSchedulerRunning = pdFALSE;
static int16_t sSchedulerRunning = 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 )();
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 )();
static void( __interrupt __far * pxOldSwitchISRPlus1 )();
/* Used to restore the original DOS context when the scheduler is ended. */
static jmp_buf xJumpBuf;
@ -117,185 +119,190 @@ static jmp_buf xJumpBuf;
/*-----------------------------------------------------------*/
BaseType_t xPortStartScheduler( void )
{
pxISR pxOriginalTickISR;
/* This is called with interrupts already disabled. */
pxISR pxOriginalTickISR;
/* 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 );
/* This is called with interrupts already disabled. */
prvSetTickFrequency( configTICK_RATE_HZ );
/* 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 );
/* Put our manual switch (yield) function on a known
vector. */
_dos_setvect( portSWITCH_INT_NUMBER, prvYieldProcessor );
prvSetTickFrequency( configTICK_RATE_HZ );
/* Put the old tick on a different interrupt number so we can
call it when we want. */
_dos_setvect( portSWITCH_INT_NUMBER + 1, pxOriginalTickISR );
/* 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
/* Put the old tick on a different interrupt number so we can
* call it when we want. */
_dos_setvect( portSWITCH_INT_NUMBER + 1, pxOriginalTickISR );
/* 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;
#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
/* Clean up function if we want to return to DOS. */
if( setjmp( xJumpBuf ) != 0 )
{
prvExitFunction();
sSchedulerRunning = pdFALSE;
}
else
{
sSchedulerRunning = pdTRUE;
/* 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;
/* Kick off the scheduler by setting up the context of the first task. */
portFIRST_CONTEXT();
}
/* Clean up function if we want to return to DOS. */
if( setjmp( xJumpBuf ) != 0 )
{
prvExitFunction();
sSchedulerRunning = pdFALSE;
}
else
{
sSchedulerRunning = pdTRUE;
return sSchedulerRunning;
/* Kick off the scheduler by setting up the context of the first task. */
portFIRST_CONTEXT();
}
return sSchedulerRunning;
}
/*-----------------------------------------------------------*/
/* The tick ISR used depends on whether the preemptive or cooperative scheduler
is being used. */
* 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 )
{
/* Get the scheduler to update the task states following the tick. */
if( xTaskIncrementTick() != pdFALSE )
{
/* 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. */
xTaskIncrementTick();
prvPortResetPIC();
}
#endif
/* Tick service routine used by the scheduler when preemptive scheduling is
* being used. */
static void __interrupt __far prvPreemptiveTick( void )
{
/* Get the scheduler to update the task states following the tick. */
if( xTaskIncrementTick() != pdFALSE )
{
/* Switch in the context of the next task to be run. */
portSWITCH_CONTEXT();
}
/* Reset the PIC ready for the next time. */
prvPortResetPIC();
}
#else /* if configUSE_PREEMPTION == 1 */
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. */
xTaskIncrementTick();
prvPortResetPIC();
}
#endif /* if configUSE_PREEMPTION == 1 */
/*-----------------------------------------------------------*/
static void __interrupt __far prvYieldProcessor( void )
{
/* Switch in the context of the next task to be run. */
portSWITCH_CONTEXT();
/* 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 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 = ( int16_t ) 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
};
}
/* WE SHOULD NOT DO THIS IF YIELD WAS CALLED. */
--sDOSTickCounter;
if( sDOSTickCounter <= 0 )
{
sDOSTickCounter = ( int16_t ) 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 );
/* 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 )();
void( __interrupt __far * pxOriginalTickISR )();
/* Interrupts should be disabled here anyway - but no
harm in making sure. */
portDISABLE_INTERRUPTS();
if( sSchedulerRunning == pdTRUE )
{
/* Set the DOS tick back onto the timer ticker. */
pxOriginalTickISR = _dos_getvect( portSWITCH_INT_NUMBER + 1 );
_dos_setvect( portTIMER_INT_NUMBER, pxOriginalTickISR );
prvSetTickFrequencyDefault();
/* Interrupts should be disabled here anyway - but no
* harm in making sure. */
portDISABLE_INTERRUPTS();
/* 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();
if( sSchedulerRunning == 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();
}
/*-----------------------------------------------------------*/
static void prvSetTickFrequency( uint32_t ulTickRateHz )
{
const uint16_t usPIT_MODE = ( uint16_t ) 0x43;
const uint16_t usPIT0 = ( uint16_t ) 0x40;
const uint32_t ulPIT_CONST = ( uint32_t ) 1193180;
const uint16_t us8254_CTR0_MODE3 = ( uint16_t ) 0x36;
uint32_t ulOutput;
const uint16_t usPIT_MODE = ( uint16_t ) 0x43;
const uint16_t usPIT0 = ( uint16_t ) 0x40;
const uint32_t ulPIT_CONST = ( uint32_t ) 1193180;
const uint16_t us8254_CTR0_MODE3 = ( uint16_t ) 0x36;
uint32_t ulOutput;
/* Setup the 8245 to tick at the wanted frequency. */
portOUTPUT_BYTE( usPIT_MODE, us8254_CTR0_MODE3 );
ulOutput = ulPIT_CONST / ulTickRateHz;
portOUTPUT_BYTE( usPIT0, ( uint16_t )( ulOutput & ( uint32_t ) 0xff ) );
ulOutput >>= 8;
portOUTPUT_BYTE( usPIT0, ( uint16_t ) ( ulOutput & ( uint32_t ) 0xff ) );
/* Setup the 8245 to tick at the wanted frequency. */
portOUTPUT_BYTE( usPIT_MODE, us8254_CTR0_MODE3 );
ulOutput = ulPIT_CONST / ulTickRateHz;
portOUTPUT_BYTE( usPIT0, ( uint16_t ) ( ulOutput & ( uint32_t ) 0xff ) );
ulOutput >>= 8;
portOUTPUT_BYTE( usPIT0, ( uint16_t ) ( ulOutput & ( uint32_t ) 0xff ) );
}
/*-----------------------------------------------------------*/
static void prvSetTickFrequencyDefault( void )
{
const uint16_t usPIT_MODE = ( uint16_t ) 0x43;
const uint16_t usPIT0 = ( uint16_t ) 0x40;
const uint16_t us8254_CTR0_MODE3 = ( uint16_t ) 0x36;
const uint16_t usPIT_MODE = ( uint16_t ) 0x43;
const uint16_t usPIT0 = ( uint16_t ) 0x40;
const uint16_t us8254_CTR0_MODE3 = ( uint16_t ) 0x36;
portOUTPUT_BYTE( usPIT_MODE, us8254_CTR0_MODE3 );
portOUTPUT_BYTE( usPIT0,0 );
portOUTPUT_BYTE( usPIT0,0 );
portOUTPUT_BYTE( usPIT_MODE, us8254_CTR0_MODE3 );
portOUTPUT_BYTE( usPIT0, 0 );
portOUTPUT_BYTE( usPIT0, 0 );
}
/*lint +e950 */

97
portable/oWatcom/16BitDOS/PC/portmacro.h
View file

@ -25,11 +25,11 @@
*/
#ifndef PORTMACRO_H
#define PORTMACRO_H
#define PORTMACRO_H
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*-----------------------------------------------------------
* Port specific definitions.
@ -42,70 +42,69 @@ extern "C" {
*/
/* Type definitions. */
#define portCHAR char
#define portFLOAT float
#define portDOUBLE double
#define portLONG long
#define portSHORT int
#define portSTACK_TYPE uint16_t
#define portBASE_TYPE short
#define portCHAR char
#define portFLOAT float
#define portDOUBLE double
#define portLONG long
#define portSHORT int
#define portSTACK_TYPE uint16_t
#define portBASE_TYPE short
typedef portSTACK_TYPE StackType_t;
typedef short BaseType_t;
typedef unsigned short UBaseType_t;
typedef portSTACK_TYPE StackType_t;
typedef short BaseType_t;
typedef unsigned short UBaseType_t;
#if( configUSE_16_BIT_TICKS == 1 )
typedef uint16_t TickType_t;
#define portMAX_DELAY ( TickType_t ) 0xffff
#else
typedef uint32_t TickType_t;
#define portMAX_DELAY ( TickType_t ) 0xffffffffUL
#endif
#if ( configUSE_16_BIT_TICKS == 1 )
typedef uint16_t TickType_t;
#define portMAX_DELAY ( TickType_t ) 0xffff
#else
typedef uint32_t TickType_t;
#define portMAX_DELAY ( TickType_t ) 0xffffffffUL
#endif
/*-----------------------------------------------------------*/
/* Critical section definitions. portENTER_CRITICAL() must be defined as a
macro for portable.h to work properly. */
void portLOCAL_ENTER_CRITICAL( void );
#pragma aux portLOCAL_ENTER_CRITICAL = "pushf" \
"cli";
#define portENTER_CRITICAL() portLOCAL_ENTER_CRITICAL()
* macro for portable.h to work properly. */
void portLOCAL_ENTER_CRITICAL( void );
#pragma aux portLOCAL_ENTER_CRITICAL = "pushf" \
"cli";
#define portENTER_CRITICAL() portLOCAL_ENTER_CRITICAL()
void portEXIT_CRITICAL( void );
#pragma aux portEXIT_CRITICAL = "popf";
void portEXIT_CRITICAL( void );
#pragma aux portEXIT_CRITICAL = "popf";
void portDISABLE_INTERRUPTS( void );
#pragma aux portDISABLE_INTERRUPTS = "cli";
void portDISABLE_INTERRUPTS( void );
#pragma aux portDISABLE_INTERRUPTS = "cli";
void portENABLE_INTERRUPTS( void );
#pragma aux portENABLE_INTERRUPTS = "sti";
void portENABLE_INTERRUPTS( void );
#pragma aux portENABLE_INTERRUPTS = "sti";
/*-----------------------------------------------------------*/
/* Architecture specifics. */
#define portSTACK_GROWTH ( -1 )
#define portSWITCH_INT_NUMBER 0x80
#define portYIELD() __asm{ int portSWITCH_INT_NUMBER }
#define portDOS_TICK_RATE ( 18.20648 )
#define portTICK_PERIOD_MS ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
#define portTICKS_PER_DOS_TICK ( ( uint16_t ) ( ( ( portDOUBLE ) configTICK_RATE_HZ / portDOS_TICK_RATE ) + 0.5 ) )
#define portINITIAL_SW ( ( portSTACK_TYPE ) 0x0202 ) /* Start the tasks with interrupts enabled. */
#define portBYTE_ALIGNMENT ( 2 )
#define portSTACK_GROWTH ( -1 )
#define portSWITCH_INT_NUMBER 0x80
#define portYIELD() __asm{ int portSWITCH_INT_NUMBER }
#define portDOS_TICK_RATE ( 18.20648 )
#define portTICK_PERIOD_MS ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
#define portTICKS_PER_DOS_TICK ( ( uint16_t ) ( ( ( portDOUBLE ) configTICK_RATE_HZ / portDOS_TICK_RATE ) + 0.5 ) )
#define portINITIAL_SW ( ( portSTACK_TYPE ) 0x0202 ) /* Start the tasks with interrupts enabled. */
#define portBYTE_ALIGNMENT ( 2 )
/*-----------------------------------------------------------*/
/* Compiler specifics. */
#define portINPUT_BYTE( xAddr ) inp( xAddr )
#define portOUTPUT_BYTE( xAddr, ucValue ) outp( xAddr, ucValue )
#define portNOP() __asm{ nop }
#define portINPUT_BYTE( xAddr ) inp( xAddr )
#define portOUTPUT_BYTE( xAddr, ucValue ) outp( xAddr, ucValue )
#define portNOP() __asm{ nop }
/*-----------------------------------------------------------*/
/* 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 )
#define portTASK_FUNCTION_PROTO( vTaskFunction, pvParameters ) void vTaskFunction( void * pvParameters )
#define portTASK_FUNCTION( vTaskFunction, pvParameters ) void vTaskFunction( void * pvParameters )
#ifdef __cplusplus
}
#endif
#ifdef __cplusplus
}
#endif
#endif /* PORTMACRO_H */