/*
 * FreeRTOS Kernel V10.3.1
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * http://www.FreeRTOS.org
 * http://aws.amazon.com/freertos
 *
 * 1 tab == 4 spaces!
 */


#ifndef PORTMACRO_H
    #define PORTMACRO_H

    #ifdef __cplusplus
        extern "C" {
    #endif

/*-----------------------------------------------------------
 * Port specific definitions.
 *
 * The settings in this file configure FreeRTOS correctly for the
 * given hardware and compiler.
 *
 * These settings should not be altered.
 *-----------------------------------------------------------
 */

/* Type definitions. */
    #define portCHAR          char
    #define portFLOAT         float
    #define portDOUBLE        double
    #define portLONG          long
    #define portSHORT         short
    #define portSTACK_TYPE    uint8_t
    #define portBASE_TYPE     char

    typedef portSTACK_TYPE   StackType_t;
    typedef signed char      BaseType_t;
    typedef unsigned char    UBaseType_t;


    #if ( configUSE_16_BIT_TICKS == 1 )
        typedef uint16_t     TickType_t;
        #define portMAX_DELAY    ( TickType_t ) 0xffff
    #else
        typedef uint32_t     TickType_t;
        #define portMAX_DELAY    ( TickType_t ) 0xffffffffUL
    #endif
/*-----------------------------------------------------------*/

/* Hardware specifics. */
    #define portBYTE_ALIGNMENT    1
    #define portSTACK_GROWTH      ( -1 )
    #define portTICK_PERIOD_MS    ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
    #define portYIELD()    __asm( "swi" );
/*-----------------------------------------------------------*/

/* Critical section handling. */
    #define portENABLE_INTERRUPTS()     __asm( "cli" )
    #define portDISABLE_INTERRUPTS()    __asm( "sei" )

/*
 * Disable interrupts before incrementing the count of critical section nesting.
 * The nesting count is maintained so we know when interrupts should be
 * re-enabled.  Once interrupts are disabled the nesting count can be accessed
 * directly.  Each task maintains its own nesting count.
 */
    #define portENTER_CRITICAL()                       \
    {                                                  \
        extern volatile UBaseType_t uxCriticalNesting; \
                                                       \
        portDISABLE_INTERRUPTS();                      \
        uxCriticalNesting++;                           \
    }

/*
 * Interrupts are disabled so we can access the nesting count directly.  If the
 * nesting is found to be 0 (no nesting) then we are leaving the critical
 * section and interrupts can be re-enabled.
 */
    #define  portEXIT_CRITICAL()                       \
    {                                                  \
        extern volatile UBaseType_t uxCriticalNesting; \
                                                       \
        uxCriticalNesting--;                           \
        if( uxCriticalNesting == 0 )                   \
        {                                              \
            portENABLE_INTERRUPTS();                   \
        }                                              \
    }
/*-----------------------------------------------------------*/

/* Task utilities. */

/*
 * These macros are very simple as the processor automatically saves and
 * restores its registers as interrupts are entered and exited.  In
 * addition to the (automatically stacked) registers we also stack the
 * critical nesting count.  Each task maintains its own critical nesting
 * count as it is legitimate for a task to yield from within a critical
 * section.  If the banked memory model is being used then the PPAGE
 * register is also stored as part of the tasks context.
 */

    #ifdef BANKED_MODEL

/*
 * Load the stack pointer for the task, then pull the critical nesting
 * count and PPAGE register from the stack.  The remains of the
 * context are restored by the RTI instruction.
 */
        #define portRESTORE_CONTEXT() \
    {                                 \
        __asm( "								\n\
		.globl pxCurrentTCB			; void *			\n\
		.globl uxCriticalNesting		; char				\n\
											\n\
		ldx  pxCurrentTCB							\n\
		lds  0,x				; Stack				\n\
											\n\
		movb 1,sp+,uxCriticalNesting						\n\
		movb 1,sp+,0x30				; PPAGE				\n\
		" );                          \
    }

/*
 * By the time this macro is called the processor has already stacked the
 * registers.  Simply stack the nesting count and PPAGE value, then save
 * the task stack pointer.
 */
        #define portSAVE_CONTEXT() \
    {                              \
        __asm( "								\n\
		.globl pxCurrentTCB			; void *			\n\
		.globl uxCriticalNesting		; char				\n\
											\n\
		movb 0x30, 1,-sp			; PPAGE				\n\
		movb uxCriticalNesting, 1,-sp						\n\
											\n\
		ldx  pxCurrentTCB							\n\
		sts  0,x				; Stack				\n\
		" );                       \
    }
    #else /* ifdef BANKED_MODEL */

/*
 * These macros are as per the BANKED versions above, but without saving
 * and restoring the PPAGE register.
 */

        #define portRESTORE_CONTEXT() \
    {                                 \
        __asm( "								\n\
		.globl pxCurrentTCB			; void *			\n\
		.globl uxCriticalNesting		; char				\n\
											\n\
		ldx  pxCurrentTCB							\n\
		lds  0,x				; Stack				\n\
											\n\
		movb 1,sp+,uxCriticalNesting						\n\
		" );                          \
    }

        #define portSAVE_CONTEXT() \
    {                              \
        __asm( "								\n\
		.globl pxCurrentTCB			; void *			\n\
		.globl uxCriticalNesting		; char				\n\
											\n\
		movb uxCriticalNesting, 1,-sp						\n\
											\n\
		ldx  pxCurrentTCB							\n\
		sts  0,x				; Stack				\n\
		" );                       \
    }
    #endif /* ifdef BANKED_MODEL */

/*
 * Utility macros to save/restore correct software registers for GCC. This is
 * useful when GCC does not generate appropriate ISR head/tail code.
 */
    #define portISR_HEAD() \
    {                      \
        __asm( "									\n\
		movw _.frame, 2,-sp							\n\
		movw _.tmp, 2,-sp							\n\
		movw _.z, 2,-sp								\n\
		movw _.xy, 2,-sp							\n\
		;movw _.d2, 2,-sp							\n\
		;movw _.d1, 2,-sp							\n\
		" );               \
    }

    #define portISR_TAIL() \
    {                      \
        __asm( "									\n\
		movw 2,sp+, _.xy							\n\
		movw 2,sp+, _.z								\n\
		movw 2,sp+, _.tmp							\n\
		movw 2,sp+, _.frame							\n\
		;movw 2,sp+, _.d1							\n\
		;movw 2,sp+, _.d2							\n\
		rti									\n\
		" );               \
    }

/*
 * Utility macro to call macros above in correct order in order to perform a
 * task switch from within a standard ISR.  This macro can only be used if
 * the ISR does not use any local (stack) variables.  If the ISR uses stack
 * variables portYIELD() should be used in it's place.
 */

    #define portTASK_SWITCH_FROM_ISR() \
    portSAVE_CONTEXT();                \
    vTaskSwitchContext();              \
    portRESTORE_CONTEXT();


/* Task function macros as described on the FreeRTOS.org WEB site. */
    #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
    #define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )

    #ifdef __cplusplus
        }
    #endif

#endif /* PORTMACRO_H */
