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Subversion Repositories openrisc_2011-10-31

[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [IAR/] [AtmelSAM7S64/] [portasm.s79] - Rev 572

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                RSEG ICODE:CODE
                CODE32

        EXTERN vTaskSwitchContext
        EXTERN vTaskIncrementTick

        PUBLIC vPortYieldProcessor
        PUBLIC vPortPreemptiveTick
        PUBLIC vPortStartFirstTask

#include "AT91SAM7S64_inc.h"
#include "ISR_Support.h"

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Starting the first task is just a matter of restoring the context that
; was created by pxPortInitialiseStack().
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
vPortStartFirstTask:
        portRESTORE_CONTEXT

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Manual context switch function.  This is the SWI hander.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
vPortYieldProcessor:
        ADD             LR, LR, #4                      ; Add 4 to the LR to make the LR appear exactly 
                                                                ; as if the context was saved during and IRQ 
                                                                ; handler.
                                                                
        portSAVE_CONTEXT                        ; Save the context of the current task...
        LDR R0, =vTaskSwitchContext     ; before selecting the next task to execute.
        mov     lr, pc
        BX R0
        portRESTORE_CONTEXT                     ; Restore the context of the selected task.

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Preemptive context switch function.  This will only ever get installed if
; portUSE_PREEMPTION is set to 1 in portmacro.h.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
vPortPreemptiveTick:
        portSAVE_CONTEXT                        ; Save the context of the current task.

        LDR R0, =vTaskIncrementTick ; Increment the tick count - this may wake a task.
        mov lr, pc
        BX R0
        LDR R0, =vTaskSwitchContext ; Select the next task to execute.
        mov lr, pc
        BX R0

        LDR     R14, =AT91C_BASE_PITC   ; Clear the PIT interrupt
        LDR     R0, [R14, #PITC_PIVR ]

        LDR R14, =AT91C_BASE_AIC        ; Mark the End of Interrupt on the AIC
    STR R14, [R14, #AIC_EOICR]

        portRESTORE_CONTEXT                     ; Restore the context of the selected task.


        END

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