/*
    FreeRTOS V8.2.1 - Copyright (C) 2015 Real Time Engineers Ltd.
    All rights reserved

    VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    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.  Full license text is available on the following
    link: http://www.freertos.org/a00114.html

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS provides completely free yet professionally developed,    *
     *    robust, strictly quality controlled, supported, and cross          *
     *    platform software that is more than just the market leader, it     *
     *    is the industry's de facto standard.                               *
     *                                                                       *
     *    Help yourself get started quickly while simultaneously helping     *
     *    to support the FreeRTOS project by purchasing a FreeRTOS           *
     *    tutorial book, reference manual, or both:                          *
     *    http://www.FreeRTOS.org/Documentation                              *
     *                                                                       *
    ***************************************************************************

    http://www.FreeRTOS.org/FAQHelp.html - Having a problem?  Start by reading
    the FAQ page "My application does not run, what could be wrong?".  Have you
    defined configASSERT()?

    http://www.FreeRTOS.org/support - In return for receiving this top quality
    embedded software for free we request you assist our global community by
    participating in the support forum.

    http://www.FreeRTOS.org/training - Investing in training allows your team to
    be as productive as possible as early as possible.  Now you can receive
    FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
    Ltd, and the world's leading authority on the world's leading RTOS.

    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
    including FreeRTOS+Trace - an indispensable productivity tool, a DOS
    compatible FAT file system, and our tiny thread aware UDP/IP stack.

    http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
    Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.

    http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
    Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS
    licenses offer ticketed support, indemnification and commercial middleware.

    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.

    1 tab == 4 spaces!
*/

	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
