diff options
Diffstat (limited to 'kern/xcall.h')
| -rw-r--r-- | kern/xcall.h | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/kern/xcall.h b/kern/xcall.h index df36487..4733152 100644 --- a/kern/xcall.h +++ b/kern/xcall.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014 Richard Braun. + * 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 @@ -19,11 +19,15 @@ * * 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 <kern/init.h> + /* * Type for cross-call functions. */ @@ -33,19 +37,28 @@ 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, with the side effects of - * the function visible. + * 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 function is run in interrupt context. Interrupts must be enabled + * 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); /* - * Report a cross-call interrupt from a remote processor. + * 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 */ |