2017-05-11 15:03:03 +02:00
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/*
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* \brief RAM dataspace factory
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* \author Norman Feske
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* \date 2017-05-11
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*/
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/*
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* Copyright (C) 2017 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 Affero General Public License version 3.
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*/
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#ifndef _CORE__INCLUDE__RAM_DATASPACE_FACTORY_H_
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#define _CORE__INCLUDE__RAM_DATASPACE_FACTORY_H_
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/* Genode includes */
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#include <base/heap.h>
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#include <base/tslab.h>
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/* base-internal includes */
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#include <base/internal/page_size.h>
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/* core includes */
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#include <dataspace_component.h>
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namespace Genode { class Ram_dataspace_factory; }
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class Genode::Ram_dataspace_factory : public Ram_allocator,
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public Dataspace_owner
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{
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public:
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struct Phys_range { addr_t start, end; };
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static Phys_range any_phys_range() { return { 0UL, ~0UL }; }
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2017-08-23 11:02:12 +02:00
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struct Virt_range { addr_t start, size; };
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2017-11-09 14:20:07 +01:00
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static constexpr size_t SLAB_BLOCK_SIZE = 4096;
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2017-05-11 15:03:03 +02:00
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private:
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Rpc_entrypoint &_ep;
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Range_allocator &_phys_alloc;
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Phys_range const _phys_range;
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/*
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* Statically allocated initial slab block for '_ds_slab', needed to
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* untangle the hen-and-egg problem of allocating the meta data for
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* core's RAM allocator from itself. I also saves the allocation
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* of one dataspace (along with a dataspace capability) per session.
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*/
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uint8_t _initial_sb[SLAB_BLOCK_SIZE];
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Tslab<Dataspace_component, SLAB_BLOCK_SIZE> _ds_slab;
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/********************************************
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** Platform-implemented support functions **
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********************************************/
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struct Core_virtual_memory_exhausted : Exception { };
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/**
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* Export RAM dataspace as shared memory block
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*
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* \throw Core_virtual_memory_exhausted
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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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void _export_ram_ds(Dataspace_component &ds);
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2017-05-11 15:03:03 +02:00
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/**
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* Revert export of RAM dataspace
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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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void _revoke_ram_ds(Dataspace_component &ds);
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2017-05-11 15:03:03 +02:00
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/**
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* Zero-out content of dataspace
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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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void _clear_ds(Dataspace_component &ds);
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2017-05-11 15:03:03 +02:00
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public:
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Ram_dataspace_factory(Rpc_entrypoint &ep,
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Range_allocator &phys_alloc,
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Phys_range phys_range,
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Follow practices suggested by "Effective C++"
The patch adjust the code of the base, base-<kernel>, and os repository.
To adapt existing components to fix violations of the best practices
suggested by "Effective C++" as reported by the -Weffc++ compiler
argument. The changes follow the patterns outlined below:
* A class with virtual functions can no longer publicly inherit base
classed without a vtable. The inherited object may either be moved
to a member variable, or inherited privately. The latter would be
used for classes that inherit 'List::Element' or 'Avl_node'. In order
to enable the 'List' and 'Avl_tree' to access the meta data, the
'List' must become a friend.
* Instead of adding a virtual destructor to abstract base classes,
we inherit the new 'Interface' class, which contains a virtual
destructor. This way, single-line abstract base classes can stay
as compact as they are now. The 'Interface' utility resides in
base/include/util/interface.h.
* With the new warnings enabled, all member variables must be explicitly
initialized. Basic types may be initialized with '='. All other types
are initialized with braces '{ ... }' or as class initializers. If
basic types and non-basic types appear in a row, it is nice to only
use the brace syntax (also for basic types) and align the braces.
* If a class contains pointers as members, it must now also provide a
copy constructor and assignment operator. In the most cases, one
would make them private, effectively disallowing the objects to be
copied. Unfortunately, this warning cannot be fixed be inheriting
our existing 'Noncopyable' class (the compiler fails to detect that
the inheriting class cannot be copied and still gives the error).
For now, we have to manually add declarations for both the copy
constructor and assignment operator as private class members. Those
declarations should be prepended with a comment like this:
/*
* Noncopyable
*/
Thread(Thread const &);
Thread &operator = (Thread const &);
In the future, we should revisit these places and try to replace
the pointers with references. In the presence of at least one
reference member, the compiler would no longer implicitly generate
a copy constructor. So we could remove the manual declaration.
Issue #465
2017-12-21 15:42:15 +01:00
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Region_map &,
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2017-11-09 14:20:07 +01:00
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Allocator &allocator)
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2017-05-11 15:03:03 +02:00
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_ep(ep), _phys_alloc(phys_alloc), _phys_range(phys_range),
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2017-11-09 14:20:07 +01:00
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_ds_slab(allocator, _initial_sb)
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2017-05-11 15:03:03 +02:00
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{ }
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~Ram_dataspace_factory()
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{
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while (Dataspace_component *ds = _ds_slab.first_object())
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free(static_cap_cast<Ram_dataspace>(
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static_cap_cast<Dataspace>(ds->cap())));
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}
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/*****************************
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** Ram_allocator interface **
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*****************************/
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Ram_dataspace_capability alloc(size_t, Cache_attribute) override;
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void free(Ram_dataspace_capability) override;
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size_t dataspace_size(Ram_dataspace_capability ds) const override;
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};
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#endif /* _CORE__INCLUDE__RAM_DATASPACE_FACTORY_H_ */
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