/*
	FreeRTOS V5.4.1 - Copyright (C) 2009 Real Time Engineers Ltd.

	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.  
	Alternative commercial license and support terms are also available upon 
	request.  See the licensing section of http://www.FreeRTOS.org for full 
	license details.

	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 along
	with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
	Temple Place, Suite 330, Boston, MA  02111-1307  USA.


	***************************************************************************
	*                                                                         *
	* Looking for a quick start?  Then check out the FreeRTOS eBook!          *
	* See http://www.FreeRTOS.org/Documentation for details                   *
	*                                                                         *
	***************************************************************************

	1 tab == 4 spaces!

	Please ensure to read the configuration and relevant port sections of the
	online documentation.

	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.
*/

	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