arch/xtensa/include/xtensa_api.h

/*
 * Copyright (c) 2016 Cadence Design Systems, Inc.
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef __XTENSA_API_H__
#define __XTENSA_API_H__

#include <xtensa/hal.h>
#include "xtensa_rtos.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.
 *
 * FIXME: Remove this API entirely
 */
extern xt_exc_handler _xt_set_exception_handler(int n, xt_exc_handler f);

/*
 * Call this function to enable the specified interrupts.
 *
 * mask     - Bit mask of interrupts to be enabled.
 */
extern void _xt_ints_on(unsigned int mask);


/*
 * Call this function to disable the specified interrupts.
 *
 * mask     - Bit mask of interrupts to be disabled.
 */
extern void _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__ */