/*
    FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd.

    FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME.  PLEASE VISIT
    http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS tutorial books are available in pdf and paperback.        *
     *    Complete, revised, and edited pdf reference manuals are also       *
     *    available.                                                         *
     *                                                                       *
     *    Purchasing FreeRTOS documentation will not only help you, by       *
     *    ensuring you get running as quickly as possible and with an        *
     *    in-depth knowledge of how to use FreeRTOS, it will also help       *
     *    the FreeRTOS project to continue with its mission of providing     *
     *    professional grade, cross platform, de facto standard solutions    *
     *    for microcontrollers - completely free of charge!                  *
     *                                                                       *
     *    >>> See http://www.FreeRTOS.org/Documentation for details. <<<     *
     *                                                                       *
     *    Thank you for using FreeRTOS, and thank you for your support!      *
     *                                                                       *
    ***************************************************************************


    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 modification 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 Real Time Engineers Ltd., contact details for whom are available
    on the FreeRTOS WEB site.

    1 tab == 4 spaces!

    ***************************************************************************
     *                                                                       *
     *    Having a problem?  Start by reading the FAQ "My application does   *
     *    not run, what could be wrong?"                                     *
     *                                                                       *
     *    http://www.FreeRTOS.org/FAQHelp.html                               *
     *                                                                       *
    ***************************************************************************


    http://www.FreeRTOS.org - Documentation, books, training, latest versions, 
    license and Real Time Engineers Ltd. contact details.

    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
    including FreeRTOS+Trace - an indispensable productivity tool, and our new
    fully thread aware and reentrant UDP/IP stack.

    http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High 
    Integrity Systems, who sell the code with commercial support, 
    indemnification and middleware, under the OpenRTOS brand.
    
    http://www.SafeRTOS.com - High Integrity Systems also provide a safety 
    engineered and independently SIL3 certified version for use in safety and 
    mission critical applications that require provable dependability.
*/

	EXTERN pxCurrentTCB
	EXTERN usCriticalNesting

#include "FreeRTOSConfig.h"

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Context save and restore macro definitions
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

portSAVE_CONTEXT MACRO

    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
#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

    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 */
    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

    ENDM