277 lines
7.7 KiB
C++
277 lines
7.7 KiB
C++
/*
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* \brief Interface between kernel and userland
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* \author Martin stein
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* \date 2011-11-30
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*/
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/*
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* Copyright (C) 2011-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _KERNEL__INTERFACE_H_
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#define _KERNEL__INTERFACE_H_
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/* base-hw includes */
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#include <kernel/interface_support.h>
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namespace Genode
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{
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class Native_utcb;
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class Platform_pd;
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class Tlb;
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}
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namespace Kernel
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{
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typedef Genode::Tlb Tlb;
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typedef Genode::addr_t addr_t;
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typedef Genode::size_t size_t;
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typedef Genode::Platform_pd Platform_pd;
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typedef Genode::Native_utcb Native_utcb;
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/**
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* Kernel names of the kernel calls
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*/
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constexpr Call_arg call_id_pause_thread() { return 0; }
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constexpr Call_arg call_id_resume_thread() { return 1; }
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constexpr Call_arg call_id_yield_thread() { return 2; }
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constexpr Call_arg call_id_send_request_msg() { return 3; }
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constexpr Call_arg call_id_send_reply_msg() { return 4; }
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constexpr Call_arg call_id_await_request_msg() { return 5; }
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constexpr Call_arg call_id_kill_signal_context() { return 6; }
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constexpr Call_arg call_id_submit_signal() { return 7; }
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constexpr Call_arg call_id_await_signal() { return 8; }
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constexpr Call_arg call_id_signal_pending() { return 9; }
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constexpr Call_arg call_id_ack_signal() { return 10; }
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constexpr Call_arg call_id_print_char() { return 11; }
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/*****************************************************************
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** Kernel call with 1 to 6 arguments **
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** **
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** These functions must not be inline to ensure that objects, **
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** wich are referenced by arguments, are tagged as "used" even **
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** though only the pointer gets handled in here. **
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*****************************************************************/
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Call_ret call(Call_arg arg_0);
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Call_ret call(Call_arg arg_0,
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Call_arg arg_1);
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Call_ret call(Call_arg arg_0,
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Call_arg arg_1,
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Call_arg arg_2);
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Call_ret call(Call_arg arg_0,
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Call_arg arg_1,
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Call_arg arg_2,
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Call_arg arg_3);
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Call_ret call(Call_arg arg_0,
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Call_arg arg_1,
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Call_arg arg_2,
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Call_arg arg_3,
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Call_arg arg_4);
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Call_ret call(Call_arg arg_0,
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Call_arg arg_1,
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Call_arg arg_2,
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Call_arg arg_3,
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Call_arg arg_4,
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Call_arg arg_5);
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/**
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* Prevent thread from participating in CPU scheduling
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*
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* \param thread_id kernel name of the targeted thread or 0
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*
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* If thread_id is set to 0 the caller targets itself. If the caller
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* doesn't target itself, the call is restricted to core threads.
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*/
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inline void pause_thread(unsigned const thread_id)
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{
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call(call_id_pause_thread(), thread_id);
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}
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/**
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* Let an already started thread participate in CPU scheduling
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*
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* \param thread_id kernel name of the targeted thread
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*
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* \retval 0 succeeded and thread was paused beforehand
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* \retval 1 succeeded and thread was active beforehand
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* \retval -1 failed
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*
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* If the targeted thread blocks for any event except a 'start_thread'
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* call this call cancels the blocking.
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*/
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inline int resume_thread(unsigned const thread_id)
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{
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return call(call_id_resume_thread(), thread_id);
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}
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/**
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* Let the current thread give up its remaining timeslice
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*
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* \param thread_id kernel name of the benefited thread
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*
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* If thread_id is valid the call will resume the targeted thread
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* additionally.
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*/
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inline void yield_thread(unsigned const thread_id)
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{
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call(call_id_yield_thread(), thread_id);
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}
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/**
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* Send request message and await receipt of corresponding reply message
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*
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* \param thread_id kernel name of targeted thread
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*
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* \retval 0 succeeded
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* \retval -1 failed
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*
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* If the call returns successful, the received message is located at the
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* base of the callers userland thread-context.
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*/
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inline int send_request_msg(unsigned const thread_id)
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{
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return call(call_id_send_request_msg(), thread_id);
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}
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/**
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* Await receipt of request message
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*
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* \retval 0 succeeded
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* \retval -1 failed
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*
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* If the call returns successful, the received message is located at the
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* base of the callers userland thread-context.
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*/
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inline int await_request_msg()
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{
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return call(call_id_await_request_msg());
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}
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/**
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* Reply to lastly received request message
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*
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* \param await_request_msg wether the call shall await a request message
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*
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* \retval 0 await_request_msg == 0 or request-message receipt succeeded
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* \retval -1 await_request_msg == 1 and request-message receipt failed
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*
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* If the call returns successful and await_request_msg == 1, the received
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* message is located at the base of the callers userland thread-context.
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*/
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inline int send_reply_msg(bool const await_request_msg)
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{
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return call(call_id_send_reply_msg(), await_request_msg);
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}
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/**
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* Print a char c to the kernels serial ouput
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*
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* If c is set to 0 the kernel prints a table of all threads and their
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* current activities to the serial output.
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*/
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inline void print_char(char const c)
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{
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call(call_id_print_char(), c);
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}
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/**
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* Await any context of a receiver and optionally ack a context before
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*
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* \param receiver_id kernel name of the targeted signal receiver
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* \param context_id kernel name of a context that shall be acknowledged
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*
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* \retval 0 suceeded
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* \retval -1 failed
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*
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* If context is set to 0, the call doesn't acknowledge any context.
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* If this call returns 0, an instance of 'Signal::Data' is located at the
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* base of the callers UTCB. Every occurence of a signal is provided
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* through this function until it gets delivered through this function or
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* context respectively receiver get destructed. If multiple threads
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* listen at the same receiver, and/or multiple contexts of the receiver
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* trigger simultanously, there is no assertion about wich thread
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* receives, and from wich context. A context that delivered once doesn't
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* deliver again unless its last delivery has been acknowledged via
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* ack_signal.
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*/
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inline int await_signal(unsigned const receiver_id,
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unsigned const context_id)
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{
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return call(call_id_await_signal(), receiver_id, context_id);
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}
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/**
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* Return wether any context of a receiver is pending
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*
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* \param receiver kernel name of the targeted signal receiver
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*
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* \retval 0 none of the contexts is pending or the receiver doesn't exist
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* \retval 1 a context of the signal receiver is pending
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*/
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inline bool signal_pending(unsigned const receiver)
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{
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return call(call_id_signal_pending(), receiver);
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}
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/**
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* Trigger a specific signal context
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*
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* \param context kernel name of the targeted signal context
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* \param num how often the context shall be triggered by this call
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*
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* \retval 0 suceeded
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* \retval -1 failed
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*/
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inline int submit_signal(unsigned const context, unsigned const num)
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{
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return call(call_id_submit_signal(), context, num);
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}
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/**
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* Acknowledge the processing of the last delivery of a signal context
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*
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* \param context kernel name of the targeted signal context
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*/
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inline void ack_signal(unsigned const context)
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{
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call(call_id_ack_signal(), context);
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}
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/**
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* Halt processing of a signal context synchronously
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*
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* \param context kernel name of the targeted signal context
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*
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* \retval 0 suceeded
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* \retval -1 failed
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*/
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inline int kill_signal_context(unsigned const context)
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{
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return call(call_id_kill_signal_context(), context);
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}
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}
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#endif /* _KERNEL__INTERFACE_H_ */
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