tmt.s

抢占

;/*************************************************************************/
;/*                                                                       */
;/*        Copyright (c) 1993-1998 Accelerated Technology, Inc.           */
;/*                                                                       */
;/* PROPRIETARY RIGHTS of Accelerated Technology are involved in the      */
;/* subject matter of this material.  All manufacturing, reproduction,    */
;/* use, and sales rights pertaining to this subject matter are governed  */
;/* by the license agreement.  The recipient of this software implicitly  */
;/* accepts the terms of the license.                                     */
;/*                                                                       */
;/*************************************************************************/
;
;/*************************************************************************/
;/*                                                                       */
;/* FILE NAME                                            VERSION          */
;/*                                                                       */
;/*      tmt.s                                     PLUS/MCF5204_06/D 1.3  */
;/*                                                                       */
;/* COMPONENT                                                             */
;/*                                                                       */
;/*      TM - Timer Management                                            */
;/*                                                                       */
;/* DESCRIPTION                                                           */
;/*                                                                       */
;/*      This file contains the target dependent routines of the timer    */
;/*      management component.                                            */
;/*                                                                       */
;/* AUTHOR                                                                */
;/*                                                                       */
;/*      Barry Sellew, Accelerated Technology, Inc.                       */
;/*                                                                       */
;/* DATA STRUCTURES                                                       */
;/*                                                                       */
;/*      None                                                             */
;/*                                                                       */
;/* FUNCTIONS                                                             */
;/*                                                                       */
;/*      TMT_Set_Clock                       Set system clock             */
;/*      TMT_Retrieve_Clock                  Retrieve system clock        */
;/*      TMT_Read_Timer                      Read count-down timer        */
;/*      TMT_Enable_Timer                    Enable count-down timer      */
;/*      TMT_Adjust_Timer                    Adjust count-down timer      */
;/*      TMT_Disable_Timer                   Disable count-down timer     */
;/*      TMT_Retrieve_TS_Task                Retrieve time-sliced task ptr*/
;/*      TMT_Timer_Interrupt                 Process timer interrupt      */
;/*                                                                       */
;/* DEPENDENCIES                                                          */
;/*                                                                       */
;/*      tc_extr.h                           Thread Control functions     */
;/*      tm_extr.h                           Timer functions              */
;/*                                                                       */
;/* HISTORY                                                               */
;/*                                                                       */
;/*         NAME            DATE                    REMARKS               */
;/*                                                                       */
;/*      B. Sellew       02-21-1997      Created and verified version 1.0 */
;/*      B. Sellew       07-30-1997      Created and verified version 1.1 */
;/*      B. Sellew       11-06-1997      Created and verified version 1.2 */
;/*      B. Sellew       05-12-1998      Created and verified version 1.3 */
;/*                                                                       */
;/*************************************************************************/
;#define         NU_SOURCE_FILE
;
;
;#include        "tc_extr.h"                 /* Thread control functions  */
;#include        "tm_extr.h"                 /* Timer functions           */
;
;
;/* Define external inner-component global data references.  */
;
;extern VOID           *TCD_Current_Thread;
;extern INT             TCD_Interrupt_Level;
;extern UNSIGNED        TMD_System_Clock;
;extern UNSIGNED        TMD_Timer;
;extern INT             TMD_Timer_State;
;extern UNSIGNED        TMD_Time_Slice;
;extern TC_TCB         *TMD_Time_Slice_Task;
;extern INT             TMD_Time_Slice_State;
;extern TC_HCB          TMD_HISR;
;extern TC_TCB          TMD_Task;
;
        XREF    _TMD_System_Clock
        XREF    _TMD_Timer
        XREF    _TMD_Timer_State
        XREF    _TMD_Time_Slice_State
        XREF    _TMD_Time_Slice
        XREF    _TMD_Time_Slice_Task
        XREF    _TCD_Current_Thread
        XREF    _TCD_Interrupt_Level
        XREF    _TMD_HISR
;
;
;/* Define external function references.  */
;
;VOID    TCT_Interrupt_Context_Save(INT vector);
;STATUS  TCT_Activate_HISR(TC_HCB *hisr);
;VOID    TCT_Interrupt_Context_Restore(VOID);
;VOID    TCT_Check_For_Preemption(VOID);
;
        XREF    _TCT_Interrupt_Context_Save
        XREF    _TCT_Activate_HISR
        XREF    _TCT_Interrupt_Context_Restore
        XREF    _TCT_Check_For_Preemption
;
;
;
;/* Define internal interrupt lockout constant.  This value must lockout 
;   the Nucleus PLUS timer interrupt.  */
;
LOCKOUT         EQU     $00000700
;
;
        SECTION .text
;/*************************************************************************/
;/*                                                                       */
;/* FUNCTION                                                              */
;/*                                                                       */
;/*      TMT_Set_Clock                                                    */
;/*                                                                       */
;/* DESCRIPTION                                                           */
;/*                                                                       */
;/*      This function sets the system clock to the specified value.      */
;/*                                                                       */
;/* AUTHOR                                                                */
;/*                                                                       */
;/*      Barry Sellew, Accelerated Technology, Inc.                       */
;/*                                                                       */
;/* CALLED BY                                                             */
;/*                                                                       */
;/*      Application                                                      */
;/*                                                                       */
;/* CALLS                                                                 */
;/*                                                                       */
;/*      None                                                             */
;/*                                                                       */
;/* INPUTS                                                                */
;/*                                                                       */
;/*      new_value                           New value for the clock      */
;/*                                                                       */
;/* OUTPUTS                                                               */
;/*                                                                       */
;/*      None                                                             */
;/*                                                                       */
;/* HISTORY                                                               */
;/*                                                                       */
;/*         NAME            DATE                    REMARKS               */
;/*                                                                       */
;/*      B. Sellew       02-21-1997      Created and verified version 1.0 */
;/*                                                                       */
;/*************************************************************************/
        XDEF    _TMT_Set_Clock
_TMT_Set_Clock:
;VOID  TMT_Set_Clock(UNSIGNED new_value)
;{
;
;    /* Set the system clock to the specified value.  */
;    TMD_System_Clock =  new_value;
;
	MOVE.L	D1,-(A7)                    ; Set the system clock
	MOVE.L	8(A7),D1
	MOVE.L	D1,_TMD_System_Clock
	MOVE.L	(A7)+,D1
        RTS                                 ; Return to caller
;}
;
;/*************************************************************************/
;/*                                                                       */
;/* FUNCTION                                                              */
;/*                                                                       */
;/*      TMT_Retrieve_Clock                                               */
;/*                                                                       */
;/* DESCRIPTION                                                           */
;/*                                                                       */
;/*      This function returns the current value of the system clock.     */
;/*                                                                       */
;/* AUTHOR                                                                */
;/*                                                                       */
;/*      Barry Sellew, Accelerated Technology, Inc.                       */
;/*                                                                       */
;/* CALLED BY                                                             */
;/*                                                                       */
;/*      Application                                                      */
;/*                                                                       */
;/* CALLS                                                                 */
;/*                                                                       */
;/*      None                                                             */
;/*                                                                       */
;/* INPUTS                                                                */
;/*                                                                       */
;/*      None                                                             */
;/*                                                                       */
;/* OUTPUTS                                                               */
;/*                                                                       */
;/*      TMD_System_Clock                    Value of system clock        */
;/*                                                                       */
;/* HISTORY                                                               */
;/*                                                                       */
;/*         NAME            DATE                    REMARKS               */
;/*                                                                       */
;/*      B. Sellew       02-21-1997      Created and verified version 1.0 */
;/*                                                                       */
;/*************************************************************************/
        XDEF    _TMT_Retrieve_Clock
_TMT_Retrieve_Clock:
;UNSIGNED  TMT_Retrieve_Clock(void)
;{
;
;    /* Return the current value of the system clock.  */
;    return(TMD_System_Clock);
;
        MOVE.L  _TMD_System_Clock,D0        ; Pickup the system clock 
        RTS                                 ; Return to caller
;}
;
;/*************************************************************************/
;/*                                                                       */
;/* FUNCTION                                                              */
;/*                                                                       */
;/*      TMT_Read_Timer                                                   */
;/*                                                                       */
;/* DESCRIPTION                                                           */
;/*                                                                       */
;/*      This function returns the current value of the count-down timer. */
;/*                                                                       */
;/* AUTHOR                                                                */
;/*                                                                       */
;/*      Barry Sellew, Accelerated Technology, Inc.                       */
;/*                                                                       */
;/* CALLED BY                                                             */