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1308 jermar 1
/*
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 * Copyright (C) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/**
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 * @file    cap.c
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 * @brief   Functions to grant/revoke capabilities to/from a task.
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 */
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#include <cap.h>
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#include <task.h>
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#include <libc.h>
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#include <kernel/syscall/sysarg64.h>
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/** Grant capabilities to a task.
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 *
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 * @param id Destination task ID.
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 * @param caps Capabilities to grant.
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 *
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 * @return Zero on success or a value from @ref errno.h on failure.
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 */
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int cap_grant(task_id_t id, unsigned int caps)
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{
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    sysarg64_t arg;
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    arg.value = (unsigned long long) id;
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    __SYSCALL2(SYS_CAP_GRANT, (sysarg_t) &arg, (sysarg_t) caps);
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}
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/** Revoke capabilities from a task.
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 *
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 * @param id Destination task ID.
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 * @param caps Capabilities to revoke.
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 *
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 * @return Zero on success or a value from @ref errno.h on failure.
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 */
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int cap_revoke(task_id_t id, unsigned int caps)
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{
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    sysarg64_t arg;
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    arg.value = (unsigned long long) id;
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    __SYSCALL2(SYS_CAP_REVOKE, (sysarg_t) &arg, (sysarg_t) caps);
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}