;/*
; FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd.
;
;
; ***************************************************************************
; * *
; * 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 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 xTaskIncrementTick
; 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
; Tick ISR Prototype
;------------------------------------------------------------------------------
PUBWEAK `??MD_INTTM0EQ0??INTVEC 640`
PUBLIC MD_INTTM0EQ0
MD_INTTM0EQ0 SYMBOL "MD_INTTM0EQ0"
`??MD_INTTM0EQ0??INTVEC 640` SYMBOL "??INTVEC 640", 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 xTaskIncrementTick,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 xTaskIncrementTick,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 640
`??MD_INTTM0EQ0??INTVEC 640`:
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
END