Subversion Repositories openrisc_2011-10-31

;/*
;    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
;
;    ***************************************************************************
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;
;    This file is part of the FreeRTOS distribution.
;
;    FreeRTOS is free software; you can redistribute it and/or modify it under
;    the terms of the GNU General Public License (version 2) as published by the
;    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
;    ***NOTE*** The exception to the GPL is included to allow you to distribute
;    a combined work that includes FreeRTOS without being obliged to provide the
;    source code for proprietary components outside of the FreeRTOS kernel.
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;    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 and the FreeRTOS license exception along with FreeRTOS; if not it 
;    can be viewed here: http://www.freertos.org/a00114.html and also obtained 
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;    FreeRTOS WEB site.
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;*/
#include "ISR_Support.h"
;------------------------------------------------------------------------------

#if __CORE__ != __78K0R__
        #error "This file is only for 78K0R Devices"
#endif

#define CS                    0xFFFFC
#define ES                    0xFFFFD

; Functions implemented in this file
;------------------------------------------------------------------------------
        PUBLIC    vPortYield
        PUBLIC    vPortStart

; Functions used by scheduler
;------------------------------------------------------------------------------
        EXTERN    vTaskSwitchContext
        EXTERN    vTaskIncrementTick

; Tick ISR Prototype
;------------------------------------------------------------------------------
;       EXTERN    ?CL78K0R_V2_L00

        PUBWEAK   `??MD_INTTM05??INTVEC 68`
        PUBLIC    MD_INTTM05

MD_INTTM05    SYMBOL "MD_INTTM05"
`??MD_INTTM05??INTVEC 68` SYMBOL "??INTVEC 68", MD_INTTM05



;------------------------------------------------------------------------------
;   Yield to another task.  Implemented as a software interrupt.  The return
;   address and PSW will have been saved to the stack automatically before
;   this code runs.
;
;   Input:  NONE
;
;   Call:   CALL    vPortYield
;
;   Output: NONE
;
;------------------------------------------------------------------------------
    RSEG CODE:CODE
vPortYield:
        portSAVE_CONTEXT                        ; Save the context of the current task.
        call      vTaskSwitchContext    ; Call the scheduler to select the next task.
        portRESTORE_CONTEXT                     ; Restore the context of the next task to run.
        retb

        
;------------------------------------------------------------------------------
;   Restore the context of the first task that is going to run.
;
;   Input:  NONE
;
;   Call:   CALL    vPortStart
;
;   Output: NONE
;
;------------------------------------------------------------------------------ 
    RSEG CODE:CODE
vPortStart:
        portRESTORE_CONTEXT                 ; Restore the context of whichever task the ...
        reti                                            ; An interrupt stack frame is used so the task
                                    ; is started using a RETI instruction.

;------------------------------------------------------------------------------
;   Perform the necessary steps of the Tick Count Increment and Task Switch
;   depending on the chosen kernel configuration
;
;   Input:  NONE
;
;   Call:   ISR
;
;   Output: NONE
;
;------------------------------------------------------------------------------ 

MD_INTTM05:

        portSAVE_CONTEXT                        ; Save the context of the current task.
        call      vTaskIncrementTick    ; Call the timer tick function.
#if configUSE_PREEMPTION == 1
        call      vTaskSwitchContext    ; Call the scheduler to select the next task.
#endif
        portRESTORE_CONTEXT                     ; Restore the context of the next task to run.
        reti



;       REQUIRE ?CL78K0R_V2_L00
        COMMON INTVEC:CODE:ROOT(1)      ; Set ISR location to the Interrupt vector table.
        ORG 68
`??MD_INTTM05??INTVEC 68`:
        DW MD_INTTM05

        COMMON INTVEC:CODE:ROOT(1)      ; Set ISR location to the Interrupt vector table.
        ORG 126
`??vPortYield??INTVEC 126`:
        DW vPortYield

                                                                        ; Set value for the usCriticalNesting.
        RSEG NEAR_ID:CONST:SORT:NOROOT(1)
`?<Initializer for usCriticalNesting>`:
        DW 10

;#endif

      END