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1208d14681
* Adds public timeout syscalls to kernel API
* Kernel::timeout installs a timeout and binds a signal context to it that
shall trigger once the timeout expired
* With Kernel::timeout_max_us, one can get the maximum installable timeout
* Kernel::timeout_age_us returns the time that has passed since the
calling threads last timeout installation
* Removes all device specific back-ends for the base-hw timer driver and
implements a generic back-end taht uses the kernel timeout API
* Adds assertions about the kernel timer frequency that originate from the
requirements of the the kernel timeout API and adjusts all timers
accordingly by using the their internal dividers
* Introduces the Kernel::Clock class. As member of each Kernel::Cpu object
it combines the management of the timer of the CPU with a timeout scheduler.
Not only the timeout API uses the timeout scheduler but also the CPUs job
scheduler for installing scheduling timeouts.
* Introduces the Kernel::time_t type for timer tic values and values inherited
from timer tics (like microseconds).
Fixes #1972
328 lines
9.2 KiB
C++
328 lines
9.2 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 _INCLUDE__KERNEL__INTERFACE_H_
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#define _INCLUDE__KERNEL__INTERFACE_H_
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/* base-hw includes */
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#include <kernel/types.h>
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#include <kernel/interface_support.h>
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namespace Kernel
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{
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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_current_thread() { return 0; }
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constexpr Call_arg call_id_resume_local_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_ack_signal() { return 9; }
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constexpr Call_arg call_id_print_char() { return 10; }
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constexpr Call_arg call_id_update_data_region() { return 11; }
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constexpr Call_arg call_id_update_instr_region() { return 12; }
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constexpr Call_arg call_id_ack_cap() { return 13; }
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constexpr Call_arg call_id_delete_cap() { return 14; }
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constexpr Call_arg call_id_timeout() { return 15; }
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constexpr Call_arg call_id_timeout_age_us() { return 16; }
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constexpr Call_arg call_id_timeout_max_us() { return 17; }
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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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* Install timeout for calling thread
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*
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* \param duration_us timeout duration in microseconds
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* \param sigid local name of signal context to trigger
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*
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* This call always overwrites the last timeout installed by the thread
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* if any.
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*/
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inline int timeout(time_t const duration_us, capid_t const sigid)
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{
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return call(call_id_timeout(), duration_us, sigid);
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}
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/**
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* Return time in microseconds since the caller installed its last timeout
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*
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* Must not be called if the installation is older than 'timeout_max_us'.
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*/
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inline time_t timeout_age_us()
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{
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return call(call_id_timeout_age_us());
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}
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/**
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* Return the constant maximum installable timeout in microseconds
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*
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* The return value is also the maximum delay to call 'timeout_age_us'
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* for a timeout after its installation.
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*/
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inline time_t timeout_max_us()
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{
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return call(call_id_timeout_max_us());
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}
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/**
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* Pause execution of calling thread
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*/
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inline void pause_current_thread()
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{
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call(call_id_pause_current_thread());
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}
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/**
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* Cancel blocking of a thread of the current domain if possible
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*
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* \param thread_id capability id of the targeted thread
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*
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* \return wether thread was in a cancelable blocking beforehand
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*/
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inline bool resume_local_thread(capid_t const thread_id)
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{
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return call(call_id_resume_local_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 capability id 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(capid_t 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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* Globally apply writes to a data region in the current domain
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*
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* \param base base of the region within the current domain
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* \param size size of the region
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*/
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inline void update_data_region(addr_t const base, size_t const size)
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{
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call(call_id_update_data_region(), (Call_arg)base, (Call_arg)size);
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}
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/**
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* Globally apply writes to an instruction region in the current domain
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*
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* \param base base of the region within the current domain
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* \param size size of the region
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*/
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inline void update_instr_region(addr_t const base, size_t const size)
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{
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call(call_id_update_instr_region(), (Call_arg)base, (Call_arg)size);
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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 capability id 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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* \retval -2 failed due to out-of-memory for capability reception
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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(capid_t const thread_id, unsigned rcv_caps)
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{
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return call(call_id_send_request_msg(), thread_id, rcv_caps);
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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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* \param rcv_caps number of capabilities willing to accept
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*
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* \retval 0 succeeded
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* \retval -1 canceled
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* \retval -2 failed due to out-of-memory for capability reception
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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(unsigned rcv_caps)
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{
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return call(call_id_await_request_msg(), rcv_caps);
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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 rcv_caps number of capabilities to accept when awaiting again
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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(unsigned rcv_caps, bool const await_request_msg)
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{
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return call(call_id_send_reply_msg(), rcv_caps, 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 capability id of the targeted signal receiver
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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 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(capid_t const receiver_id)
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{
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return call(call_id_await_signal(), receiver_id);
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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 capability id 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(capid_t 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 capability id of the targeted signal context
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*/
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inline void ack_signal(capid_t 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 capability id 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(capid_t 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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* Acknowledge reception of a capability
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*
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* \param cap capability id to acknowledge
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*/
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inline void ack_cap(capid_t const cap)
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{
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call(call_id_ack_cap(), cap);
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}
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/**
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* Delete a capability id
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*
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* \param cap capability id to delete
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*/
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inline void delete_cap(capid_t const cap)
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{
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call(call_id_delete_cap(), cap);
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}
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}
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#endif /* _INCLUDE__KERNEL__INTERFACE_H_ */
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