2011-12-22 16:19:25 +01:00
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/*
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* \brief Core-specific instance of the IO_MEM session interface (Linux)
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* \author Christian Helmuth
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* \date 2007-09-14
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*/
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/*
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2017-02-20 13:23:52 +01:00
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* Copyright (C) 2007-2017 Genode Labs GmbH
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2011-12-22 16:19:25 +01:00
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*
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* This file is part of the Genode OS framework, which is distributed
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2017-02-20 13:23:52 +01:00
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* under the terms of the GNU Affero General Public License version 3.
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2011-12-22 16:19:25 +01:00
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*/
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2016-01-20 20:52:51 +01:00
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#ifndef _CORE__INCLUDE__IO_MEM_SESSION_COMPONENT_H_
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#define _CORE__INCLUDE__IO_MEM_SESSION_COMPONENT_H_
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2011-12-22 16:19:25 +01:00
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/* Genode includes */
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#include <base/allocator.h>
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#include <base/rpc_server.h>
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#include <io_mem_session/io_mem_session.h>
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/* core includes */
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#include <dataspace_component.h>
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namespace Genode {
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class Io_mem_session_component : public Rpc_object<Io_mem_session>
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{
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2017-10-27 14:07:09 +02:00
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private:
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Range_allocator &_io_mem_alloc;
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Dataspace_component _ds;
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Rpc_entrypoint &_ds_ep;
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Io_mem_dataspace_capability _ds_cap;
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size_t get_arg_size(const char *);
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addr_t get_arg_phys(const char *);
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Cache_attribute get_arg_wc(const char *);
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2011-12-22 16:19:25 +01:00
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public:
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/**
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* Constructor
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*
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* \param io_mem_alloc MMIO region allocator
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* \param ram_alloc RAM allocator that will be checked for
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* region collisions
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* \param ds_ep entry point to manage the dataspace
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* corresponding the io_mem session
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* \param args session construction arguments, in
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* particular MMIO region base, size and
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* caching demands
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*/
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base/core: use references instead of pointers
This patch replaces the former prominent use of pointers by references
wherever feasible. This has the following benefits:
* The contract between caller and callee becomes more obvious. When
passing a reference, the contract says that the argument cannot be
a null pointer. The caller is responsible to ensure that. Therefore,
the use of reference eliminates the need to add defensive null-pointer
checks at the callee site, which sometimes merely exist to be on the
safe side. The bottom line is that the code becomes easier to follow.
* Reference members must be initialized via an object initializer,
which promotes a programming style that avoids intermediate object-
construction states. Within core, there are still a few pointers
as member variables left though. E.g., caused by the late association
of 'Platform_thread' objects with their 'Platform_pd' objects.
* If no pointers are present as member variables, we don't need to
manually provide declarations of a private copy constructor and
an assignment operator to avoid -Weffc++ errors "class ... has
pointer data members [-Werror=effc++]".
This patch also changes a few system bindings on NOVA and Fiasco.OC,
e.g., the return value of the global 'cap_map' accessor has become a
reference. Hence, the patch touches a few places outside of core.
Fixes #3135
2019-01-24 22:00:01 +01:00
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Io_mem_session_component(Range_allocator &io_mem_alloc,
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Range_allocator &ram_alloc,
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Rpc_entrypoint &ds_ep,
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2011-12-22 16:19:25 +01:00
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const char *args);
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/**
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* Destructor
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*/
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~Io_mem_session_component() { }
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/*****************************
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** Io-mem session interface **
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*****************************/
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2017-10-27 14:07:09 +02:00
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Io_mem_dataspace_capability dataspace() override;
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2011-12-22 16:19:25 +01:00
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};
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}
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2016-01-20 20:52:51 +01:00
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#endif /* _CORE__INCLUDE__IO_MEM_SESSION_COMPONENT_H_ */
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