tmt.s

已移植到TI OMAP1610处理器的Nucleus操作系统源码

;************************************************************************
;*                                                                       
;*               Copyright Mentor Graphics Corporation 2002              
;*                         All Rights Reserved.                          
;*                                                                       
;* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS  
;* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS   
;* SUBJECT TO LICENSE TERMS.                                             
;*                                                                       
;************************************************************************
;************************************************************************
;*                                                                       
;* FILE NAME                              VERSION                        
;*                                                                       
;*      tmt.s                   Nucleus PLUS\ARM925\Code Composer 1.14.1 
;*                                                                       
;* COMPONENT                                                             
;*                                                                       
;*      TM - Timer Management                                            
;*                                                                       
;* DESCRIPTION                                                           
;*                                                                       
;*      This file contains the target dependent routines of the timer    
;*      management component.                                            
;*                                                                       
;* 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. Ronquillo     08-28-2002           Released version 1.14.1     
;*                                                                       
;*                                                                       
;************************************************************************
;#define         NU_SOURCE_FILE
;******************************
;* INCLUDE ASSEMBLY CONSTANTS *
;******************************
; Define constants used in low-level initialization.
     .include "D:\XWproject\Nucleus\source\Plus\Demo\asm_defs.inc" 

	.state32

;**********************************
;* EXTERNAL VARIABLE DECLARATIONS *
;**********************************
; Define external inner-component global data references.
;extern VOID           *TCD_Current_Thread;
;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;

        .ref  _TCD_Current_Thread
        .ref  _TMD_System_Clock
        .ref  _TMD_Timer
        .ref  _TMD_Timer_State
        .ref  _TMD_Time_Slice
        .ref  _TMD_Time_Slice_Task
        .ref  _TMD_Time_Slice_State
        .ref  _TMD_HISR
        .ref  _TCD_Interrupt_Level

; Define activate HISR function.
;STATUS  TCT_Activate_HISR(TC_HCB *hisr);

        .ref  _TCT_Activate_HISR

    .text
;**********************************
;* LOCAL VARIABLE DECLARATIONS    *
;**********************************
; Define various data structure pointers so their addresses 
; can be obtained in a PC-relative manner.

System_Clock
        .word     _TMD_System_Clock

Timer
        .word     _TMD_Timer

Timer_State
        .word     _TMD_Timer_State

Slice_State
        .word     _TMD_Time_Slice_State

Time_Slice
        .word     _TMD_Time_Slice

Current_Thread
        .word     _TCD_Current_Thread

Slice_Task
        .word     _TMD_Time_Slice_Task

HISR
        .word     _TMD_HISR

Int_Level
        .word     _TCD_Interrupt_Level

;************************************************************************
;*                                                                       
;* FUNCTION                                                              
;*                                                                       
;*      TMT_Set_Clock                                                    
;*                                                                       
;* DESCRIPTION                                                           
;*                                                                       
;*      This function sets the system clock to the specified value.      
;*                                                                       
;* CALLED BY                                                             
;*                                                                       
;*      Application                                                      
;*                                                                       
;* CALLS                                                                 
;*                                                                       
;*      None                                                             
;*                                                                       
;* INPUTS                                                                
;*                                                                       
;*      new_value                           New value for the clock      
;*                                                                       
;* OUTPUTS                                                               
;*                                                                       
;*      None                                                             
;*                                                                       
;* HISTORY                                                               
;*                                                                       
;*         NAME            DATE                    REMARKS               
;*                                                                       
;*      W. Lamie        02-15-1994      Created initial version 1.0      
;*      D. Lamie        02-15-1994      Verified version 1.0             
;*                                                                       
;************************************************************************
;VOID  TMT_Set_Clock(UNSIGNED new_value)
;{
    .def    $TMT_Set_Clock
$TMT_Set_Clock                              ; Dual-state interworking veneer
    .state16
    BX  r15
    NOP
    .state32
    B   _TMT_Set_Clock

        .def    _TMT_Set_Clock
_TMT_Set_Clock

; Set the system clock to the specified value.
;    TMD_System_Clock =  new_value;

        LDR     r1,System_Clock             ; Build address of system clock
        STR     r0,[r1,#0]                  ; Store new system clock value

        BX      r14                         ; Return to caller

;}

;************************************************************************
;*                                                                       
;* FUNCTION                                                              
;*                                                                       
;*      TMT_Retrieve_Clock                                               
;*                                                                       
;* DESCRIPTION                                                           
;*                                                                       
;*      This function returns the current value of the system clock.     
;*                                                                       
;* CALLED BY                                                             
;*                                                                       
;*      Application                                                      
;*                                                                       
;* CALLS                                                                 
;*                                                                       
;*      None                                                             
;*                                                                       
;* INPUTS                                                                
;*                                                                       
;*      None                                                             
;*                                                                       
;* OUTPUTS                                                               
;*                                                                       
;*      TMD_System_Clock                    Value of system clock        
;*                                                                       
;* HISTORY                                                               
;*                                                                       
;*         NAME            DATE                    REMARKS               
;*                                                                       
;*      W. Lamie        02-15-1994      Created initial version 1.0      
;*      D. Lamie        02-15-1994      Verified version 1.0             
;*                                                                       
;************************************************************************
;UNSIGNED  TMT_Retrieve_Clock(void)
;{
    .def    $TMT_Retrieve_Clock
$TMT_Retrieve_Clock                         ; Dual-state interworking veneer   
    .state16
    BX  r15
    NOP
    .state32
    B   _TMT_Retrieve_Clock

        .def    _TMT_Retrieve_Clock
_TMT_Retrieve_Clock

; Return the current value of the system clock.
;    return(TMD_System_Clock);

        LDR     r0,System_Clock             ; Build address to system clock
        LDR     r0,[r0,#0]                  ; Pickup system clock contents

        BX      r14                         ; Return to caller

;}

;************************************************************************
;*                                                                       
;* FUNCTION                                                              
;*                                                                       
;*      TMT_Read_Timer                                                   
;*                                                                       
;* DESCRIPTION                                                           
;*