/*
* Copyright (c) 2014-2018 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see .
*
*
* Cross-processor function calls.
*
* This module provides the ability to run functions, called cross-calls,
* on specific processors.
*
* TODO Asynchronous cross-calls.
*/
#ifndef KERN_XCALL_H
#define KERN_XCALL_H
#include
/*
* Type for cross-call functions.
*/
typedef void (*xcall_fn_t)(void *arg);
/*
* Run the given cross-call function on a specific processor.
*
* The operation is completely synchronous, returning only when the function
* has finished running on the target processor. Release-acquire ordering is
* enforced both before and after the function runs on the target processor,
* so that side effects produced by the caller are visible to the function,
* and vice-versa on return.
*
* The callback function runs in interrupt context. Interrupts must be enabled
* when calling this function.
*/
void xcall_call(xcall_fn_t fn, void *arg, unsigned int cpu);
/*
* Handle a cross-call interrupt from a remote processor.
*
* Called from interrupt context.
*/
void xcall_intr(void);
/*
* This init operation provides :
* - cross-calls are usable
* - module fully initialized
*/
INIT_OP_DECLARE(xcall_setup);
#endif /* KERN_XCALL_H */