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;/*
;    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
;
;    ***************************************************************************
;    *                                                                         *
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;    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
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;    *                                                                         *
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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.
;    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
;    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 
;    by writing to Richard Barry, contact details for whom are available on the
;    FreeRTOS WEB site.
;
;    1 tab == 4 spaces!
;
;    http://www.FreeRTOS.org - Documentation, latest information, license and
;    contact details.
;
;    http://www.SafeRTOS.com - A version that is certified for use in safety
;    critical systems.
;
;    http://www.OpenRTOS.com - Commercial support, development, porting,
;    licensing and training services.
;*/
; Note: Select the correct include files for the device used by the application.
#include "FreeRTOSConfig.h"
;------------------------------------------------------------------------------

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

; Variables used by scheduler
;------------------------------------------------------------------------------
    EXTERN    pxCurrentTCB
    EXTERN    usCriticalNesting

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

; Security ID definition
;------------------------------------------------------------------------------
#define CG_SECURITY0    0FFH
#define CG_SECURITY1    0FFH
#define CG_SECURITY2    0FFH
#define CG_SECURITY3    0FFH
#define CG_SECURITY4    0FFH
#define CG_SECURITY5    0FFH
#define CG_SECURITY6    0FFH
#define CG_SECURITY7    0FFH
#define CG_SECURITY8    0FFH
#define CG_SECURITY9    0FFH

; Option Byte definitions
;------------------------------------------------------------------------------
#define CG_OPTION7A     0x00
#define CG_OPTION7B     0x04
#define OPT7C           0x00
#define OPT7D           0x00
#define OPT7E           0x00
#define OPT7F           0x00

; Tick ISR Prototype
;------------------------------------------------------------------------------
        PUBWEAK `??MD_INTTM0EQ0??INTVEC 608`
        PUBLIC MD_INTTM0EQ0

MD_INTTM0EQ0        SYMBOL "MD_INTTM0EQ0"
`??MD_INTTM0EQ0??INTVEC 608` SYMBOL "??INTVEC 608", MD_INTTM0EQ0

;------------------------------------------------------------------------------
;   portSAVE_CONTEXT MACRO
;   Saves the context of the remaining general purpose registers
;   and the usCriticalNesting Value of the active Task onto the task stack
;   saves stack pointer to the TCB
;------------------------------------------------------------------------------
portSAVE_CONTEXT MACRO
#if configDATA_MODE == 1                                        ; Using the Tiny data model
    prepare {r20,r21,r22,r23,r24,r25,r26,r27,r28,r29,r30},76,sp ; save general purpose registers
    sst.w   r19,72[ep]
    sst.w   r18,68[ep]
    sst.w   r17,64[ep]
    sst.w   r16,60[ep]
    sst.w   r15,56[ep]
    sst.w   r14,52[ep]
    sst.w   r13,48[ep]
    sst.w   r12,44[ep]
    sst.w   r11,40[ep]
    sst.w   r10,36[ep]
    sst.w   r9,32[ep]
    sst.w   r8,28[ep]
    sst.w   r7,24[ep]
    sst.w   r6,20[ep]
    sst.w   r5,16[ep]
    sst.w   r4,12[ep]
#else                                                           ; Using the Small/Large data model
    prepare {r20,r21,r22,r23,r24,r26,r27,r28,r29,r30},72,sp     ; save general purpose registers
    sst.w   r19,68[ep]
    sst.w   r18,64[ep]
    sst.w   r17,60[ep]
    sst.w   r16,56[ep]
    sst.w   r15,52[ep]
    sst.w   r14,48[ep]
    sst.w   r13,44[ep]
    sst.w   r12,40[ep]
    sst.w   r11,36[ep]
    sst.w   r10,32[ep]
    sst.w   r9,28[ep]
    sst.w   r8,24[ep]
    sst.w   r7,20[ep]
    sst.w   r6,16[ep]
    sst.w   r5,12[ep]
#endif /* configDATA_MODE */
    sst.w   r2,8[ep]
    sst.w   r1,4[ep]
    MOVHI   hi1(usCriticalNesting),r0,r1                        ; save usCriticalNesting value to stack
    ld.w    lw1(usCriticalNesting)[r1],r2
    sst.w   r2,0[ep]
    MOVHI   hi1(pxCurrentTCB),r0,r1                             ; save SP to top of current TCB
    ld.w    lw1(pxCurrentTCB)[r1],r2
    st.w    sp,0[r2]
    ENDM
;------------------------------------------------------------------------------

;------------------------------------------------------------------------------
;   portRESTORE_CONTEXT MACRO
;   Gets stack pointer from the current TCB
;   Restores the context of the usCriticalNesting value and general purpose
;   registers of the selected task from the task stack
;------------------------------------------------------------------------------
portRESTORE_CONTEXT MACRO
    MOVHI   hi1(pxCurrentTCB),r0,r1         ; get Stackpointer address
    ld.w    lw1(pxCurrentTCB)[r1],sp
    MOV     sp,r1
    ld.w    0[r1],sp                        ; load stackpointer
    MOV     sp,ep                           ; set stack pointer to element pointer
    sld.w   0[ep],r1                        ; load usCriticalNesting value from stack
    MOVHI   hi1(usCriticalNesting),r0,r2
    st.w    r1,lw1(usCriticalNesting)[r2]
    sld.w   4[ep],r1                        ; restore general purpose registers
    sld.w   8[ep],r2
#if configDATA_MODE == 1                    ; Using Tiny data model
    sld.w   12[ep],r4
    sld.w   16[ep],r5
    sld.w   20[ep],r6
    sld.w   24[ep],r7
    sld.w   28[ep],r8
    sld.w   32[ep],r9
    sld.w   36[ep],r10
    sld.w   40[ep],r11
    sld.w   44[ep],r12
    sld.w   48[ep],r13
    sld.w   52[ep],r14
    sld.w   56[ep],r15
    sld.w   60[ep],r16
    sld.w   64[ep],r17
    sld.w   68[ep],r18
    sld.w   72[ep],r19
    dispose 76,{r20,r21,r22,r23,r24,r25,r26,r27,r28,r29,r30}
#else                                       ; Using Small/Large data model
    sld.w   12[ep],r5
    sld.w   16[ep],r6
    sld.w   20[ep],r7
    sld.w   24[ep],r8
    sld.w   28[ep],r9
    sld.w   32[ep],r10
    sld.w   36[ep],r11
    sld.w   40[ep],r12
    sld.w   44[ep],r13
    sld.w   48[ep],r14
    sld.w   52[ep],r15
    sld.w   56[ep],r16
    sld.w   60[ep],r17
    sld.w   64[ep],r18
    sld.w   68[ep],r19
    dispose 72,{r20,r21,r22,r23,r24,r26,r27,r28,r29,r30}
#endif /* configDATA_MODE */
    ENDM
;------------------------------------------------------------------------------

;------------------------------------------------------------------------------
;   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 ...
    ld.w    0[sp],lp
    ldsr    lp,5                            ; restore PSW
    DI
    ld.w    4[sp],lp                        ; restore LP
    ld.w    8[sp],lp                        ; restore LP
    ADD     0x0C,sp                         ; set SP to right position
    EI
    jmp     [lp]
;------------------------------------------------------------------------------

;------------------------------------------------------------------------------
;   Port Yield function to check for a Task switch in the cooperative and
;   preemptive mode
;
;   Input:  NONE
;
;   Call:   CALL    vPortYield
;
;   Output: NONE
;------------------------------------------------------------------------------

        RSEG CODE:CODE
vPortYield:

    add     -0x0C,sp                          ; prepare stack to save necessary values
    st.w    lp,8[sp]                        ; store LP to stack
    stsr    0,r31
    st.w    lp,4[sp]                        ; store EIPC to stack
    stsr    1,lp
    st.w    lp,0[sp]                        ; store EIPSW to stack
    portSAVE_CONTEXT                        ; Save the context of the current task.
    jarl    vTaskSwitchContext,lp           ; Call the scheduler.
    portRESTORE_CONTEXT                     ; Restore the context of whichever task the ...
                                            ; ... scheduler decided should run.
        ld.w    0[sp],lp                        ; restore EIPSW from stack
    ldsr    lp,1
    ld.w    4[sp],lp                        ; restore EIPC from stack
    ldsr    lp,0
    ld.w    8[sp],lp                        ; restore LP from stack
    add     0x0C,sp                         ; set SP to right position

    RETI

;------------------------------------------------------------------------------

;------------------------------------------------------------------------------
;   Perform the necessary steps of the Tick Count Increment and Task Switch
;   depending on the chosen kernel configuration
;
;   Input:  NONE
;
;   Call:   ISR
;
;   Output: NONE
;------------------------------------------------------------------------------ 
#if configUSE_PREEMPTION == 1               ; use preemptive kernel mode

MD_INTTM0EQ0:

    add     -0x0C,sp                          ; prepare stack to save necessary values
    st.w    lp,8[sp]                        ; store LP to stack
    stsr    0,r31
    st.w    lp,4[sp]                        ; store EIPC to stack
    stsr    1,lp
    st.w    lp,0[sp]                        ; store EIPSW to stack
    portSAVE_CONTEXT                        ; Save the context of the current task.
    jarl    vTaskIncrementTick,lp           ; Call the timer tick function.
    jarl    vTaskSwitchContext,lp           ; Call the scheduler.
    portRESTORE_CONTEXT                     ; Restore the context of whichever task the ...
                                            ; ... scheduler decided should run.
    ld.w    0[sp],lp                        ; restore EIPSW from stack
    ldsr    lp,1
    ld.w    4[sp],lp                        ; restore EIPC from stack
    ldsr    lp,0
    ld.w    8[sp],lp                        ; restore LP from stack
    add     0x0C,sp                         ; set SP to right position

    RETI
;------------------------------------------------------------------------------
#else                                       ; use cooperative kernel mode

MD_INTTM0EQ0:
    prepare {lp,ep},8,sp
    sst.w   r1,4[ep]
    sst.w   r5,0[ep]
    jarl    vTaskIncrementTick,lp           ; Call the timer tick function.
    sld.w   0[ep],r5
    sld.w   4[ep],r1
    dispose 8,{lp,ep}
    RETI
#endif /* configUSE_PREEMPTION */

;------------------------------------------------------------------------------
        COMMON INTVEC:CODE:ROOT(2)
        ORG 608
`??MD_INTTM0EQ0??INTVEC 608`:
        JR MD_INTTM0EQ0

        RSEG NEAR_ID:CONST:SORT:NOROOT(2)
`?<Initializer for usCriticalNesting>`:
        DW 10

      COMMON INTVEC:CODE:ROOT(2)
      ORG 40H
`??vPortYield??INTVEC 40`:
        JR vPortYield

;------------------------------------------------------------------------------
; set microcontroller security ID

      COMMON INTVEC:CODE:ROOT(2)
      ORG 70H
`SECUID`:
      DB CG_SECURITY0
      DB CG_SECURITY1
      DB CG_SECURITY2
      DB CG_SECURITY3
      DB CG_SECURITY4
      DB CG_SECURITY5
      DB CG_SECURITY6
      DB CG_SECURITY7
      DB CG_SECURITY8
      DB CG_SECURITY9

;------------------------------------------------------------------------------
; set microcontroller option bytes

      COMMON INTVEC:CODE:ROOT(2)
      ORG 7AH
`OPTBYTES`:
      DB CG_OPTION7A
      DB CG_OPTION7B
      DB OPT7C
      DB OPT7D
      DB OPT7E
      DB OPT7F

      END