/*
 * Copyright (c) 2015-2019 Cadence Design Systems, Inc.
 *
 * 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.
 */

/*
 * Xtensa-specific API for RTOS ports.
 */

#ifndef __XTENSA_API_H__
#define __XTENSA_API_H__

#include <xtensa/hal.h>

#include "xtensa_context.h"


/* Typedef for C-callable interrupt handler function */
typedef void (* xt_handler)( void * );

/* Typedef for C-callable exception handler function */
typedef void (* xt_exc_handler)( XtExcFrame * );


/*
 * -------------------------------------------------------------------------------
 * Call this function to set a handler for the specified exception.
 *
 *  n        - Exception number (type)
 *  f        - Handler function address, NULL to uninstall handler.
 *
 * The handler will be passed a pointer to the exception frame, which is created
 * on the stack of the thread that caused the exception.
 *
 * If the handler returns, the thread context will be restored and the faulting
 * instruction will be retried. Any values in the exception frame that are
 * modified by the handler will be restored as part of the context. For details
 * of the exception frame structure see xtensa_context.h.
 * -------------------------------------------------------------------------------
 */
extern xt_exc_handler xt_set_exception_handler( int n,
                                                xt_exc_handler f );


/*
 * -------------------------------------------------------------------------------
 * Call this function to set a handler for the specified interrupt.
 *
 *  n        - Interrupt number.
 *  f        - Handler function address, NULL to uninstall handler.
 *  arg      - Argument to be passed to handler.
 * -------------------------------------------------------------------------------
 */
extern xt_handler xt_set_interrupt_handler( int n,
                                            xt_handler f,
                                            void * arg );


/*
 * -------------------------------------------------------------------------------
 * Call this function to enable the specified interrupts.
 *
 *  mask     - Bit mask of interrupts to be enabled.
 *
 * Returns the previous state of the interrupt enables.
 * -------------------------------------------------------------------------------
 */
extern unsigned int xt_ints_on( unsigned int mask );


/*
 * -------------------------------------------------------------------------------
 * Call this function to disable the specified interrupts.
 *
 *  mask     - Bit mask of interrupts to be disabled.
 *
 * Returns the previous state of the interrupt enables.
 * -------------------------------------------------------------------------------
 */
extern unsigned int xt_ints_off( unsigned int mask );


/*
 * -------------------------------------------------------------------------------
 * Call this function to set the specified (s/w) interrupt.
 * -------------------------------------------------------------------------------
 */
static inline void xt_set_intset( unsigned int arg )
{
    xthal_set_intset( arg );
}


/*
 * -------------------------------------------------------------------------------
 * Call this function to clear the specified (s/w or edge-triggered)
 * interrupt.
 * -------------------------------------------------------------------------------
 */
static inline void xt_set_intclear( unsigned int arg )
{
    xthal_set_intclear( arg );
}


#endif /* __XTENSA_API_H__ */