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

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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)

`?`:

        DW 10

;#endif

      END