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New 'os/attached_dataspace.h' utility
The new Attached_dataspace complements the existing Attached_* utilities with a simple version that can be used with any kind of dataspaces. It may be even useful as a common base type for the other variants. For example, this patch simplifies Attached_rom_dataspace and removes the Terminal::Client::Io_buffer.
This commit is contained in:
Norman Feske
Christian Helmuth
parent
759e11f9af
commit
bdfbe9f20e
os/include
83
os/include/os/attached_dataspace.h
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83
os/include/os/attached_dataspace.h
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/*
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* \brief Dataspace utility
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* \author Norman Feske
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* \date 2014-01-10
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*/
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/*
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* Copyright (C) 2014 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__OS__ATTACHED_DATASPACE_H_
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#define _INCLUDE__OS__ATTACHED_DATASPACE_H_
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#include <dataspace/client.h>
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#include <base/env.h>
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namespace Genode { class Attached_dataspace; }
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class Genode::Attached_dataspace : Noncopyable
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{
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public:
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/**
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* Exception type
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*/
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class Invalid_dataspace { };
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private:
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Dataspace_capability _ds;
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size_t const _size = { Dataspace_client(_ds).size() };
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void * const _local_addr = { env()->rm_session()->attach(_ds) };
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Dataspace_capability _check(Dataspace_capability ds)
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{
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if (ds.valid())
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return ds;
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throw Invalid_dataspace();
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}
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public:
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/**
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* Constructor
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*
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* \throw Rm_session::Attach_failed
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* \throw Invalid_dataspace
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*/
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Attached_dataspace(Dataspace_capability ds) : _ds(_check(ds)) { }
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/**
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* Destructor
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*/
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~Attached_dataspace() { env()->rm_session()->detach(_local_addr); }
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/**
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* Return capability of the used dataspace
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*/
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Dataspace_capability cap() const { return _ds; }
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/**
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* Request local address
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*
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* This is a template to avoid inconvenient casts at the caller.
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* A newly attached dataspace is untyped memory anyway.
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*/
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template <typename T>
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T *local_addr() { return static_cast<T *>(_local_addr); }
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/**
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* Return size
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*/
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size_t size() const { return _size; }
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};
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#endif /* _INCLUDE__OS__ATTACHED_DATASPACE_H_ */
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@ -14,93 +14,65 @@
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#ifndef _INCLUDE__OS__ATTACHED_ROM_DATASPACE_H_
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#define _INCLUDE__OS__ATTACHED_ROM_DATASPACE_H_
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#include <util/volatile_object.h>
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#include <os/attached_dataspace.h>
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#include <rom_session/connection.h>
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#include <dataspace/client.h>
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#include <base/env.h>
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namespace Genode {
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namespace Genode { class Attached_rom_dataspace; }
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class Attached_rom_dataspace
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{
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private:
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Rom_connection _rom;
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Rom_dataspace_capability _ds;
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size_t _size;
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void *_local_addr = 0;
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class Genode::Attached_rom_dataspace
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{
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private:
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void _detach()
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{
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if (!_local_addr)
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return;
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Rom_connection _rom;
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env()->rm_session()->detach(_local_addr);
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_local_addr = 0;
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_size = 0;
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}
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/*
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* A ROM module may change or disappear over the lifetime of a ROM
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* session. In contrast to the plain 'Attached_dataspace', which is
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* always be valid once constructed, a 'Attached_rom_dataspace' has
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* to handle the validity of the dataspace.
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*/
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Lazy_volatile_object<Attached_dataspace> _ds;
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void _attach()
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{
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if (_local_addr)
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_detach();
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/**
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* Try to attach the ROM module, ignore invalid dataspaces
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*/
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void _try_attach()
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{
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try { _ds.construct(_rom.dataspace()); }
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catch (Attached_dataspace::Invalid_dataspace) { }
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}
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_ds = _rom.dataspace();
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if (_ds.valid()) {
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_size = Dataspace_client(_ds).size();
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_local_addr = env()->rm_session()->attach(_ds);
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}
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}
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public:
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public:
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/**
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* Constructor
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*
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* \throw Rom_connection::Rom_connection_failed
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* \throw Rm_session::Attach_failed
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*/
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Attached_rom_dataspace(char const *name)
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: _rom(name) { _try_attach(); }
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/**
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* Constructor
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*
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* \throw Rom_connection::Rom_connection_failed
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* \throw Rm_session::Attach_failed
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*/
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Attached_rom_dataspace(char const *name)
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: _rom(name) { _attach(); }
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template <typename T> T *local_addr() { return _ds->local_addr<T>(); }
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/**
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* Destructor
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*/
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~Attached_rom_dataspace() { _detach(); }
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size_t size() const { return _ds->size(); }
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/**
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* Return capability of the used ROM dataspace
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*/
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Rom_dataspace_capability cap() const { return _ds; }
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/**
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* Register signal handler for ROM module changes
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*/
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void sigh(Signal_context_capability sigh) { _rom.sigh(sigh); }
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/**
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* Request local address
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*
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* This is a template to avoid inconvenient casts at the caller.
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* A newly allocated ROM dataspace is untyped memory anyway.
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*/
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template <typename T>
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T *local_addr() { return static_cast<T *>(_local_addr); }
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/**
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* Re-attach ROM module
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*/
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void update() { _try_attach(); }
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/**
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* Return size
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*/
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size_t size() const { return _size; }
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/**
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* Register signal handler for ROM module changes
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*/
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void sigh(Signal_context_capability sigh) { _rom.sigh(sigh); }
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/**
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* Re-attach ROM module
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*/
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void update() { _attach(); }
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/**
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* Return true of content is present
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*/
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bool is_valid() const { return _local_addr != 0; }
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};
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}
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/**
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* Return true of content is present
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*/
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bool is_valid() const { return _ds.is_constructed(); }
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};
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#endif /* _INCLUDE__OS__ATTACHED_ROM_DATASPACE_H_ */
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@ -18,103 +18,86 @@
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#include <util/misc_math.h>
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#include <util/string.h>
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#include <base/lock.h>
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#include <base/env.h>
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#include <base/rpc_client.h>
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#include <os/attached_dataspace.h>
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#include <terminal_session/terminal_session.h>
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namespace Terminal {
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namespace Terminal { class Session_client; }
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class Session_client : public Genode::Rpc_client<Session>
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{
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private:
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/**
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* Shared-memory buffer used for carrying the payload
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* of read/write operations
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*/
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struct Io_buffer
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{
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Genode::Dataspace_capability ds_cap;
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char *base;
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Genode::size_t size;
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Genode::Lock lock;
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class Terminal::Session_client : public Genode::Rpc_client<Session>
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{
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private:
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Io_buffer(Genode::Dataspace_capability ds_cap)
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:
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ds_cap(ds_cap),
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base(Genode::env()->rm_session()->attach(ds_cap)),
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size(ds_cap.call<Genode::Dataspace::Rpc_size>())
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{ }
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Genode::Lock _lock;
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~Io_buffer()
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{
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Genode::env()->rm_session()->detach(base);
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}
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};
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/**
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* Shared-memory buffer used for carrying the payload
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* of read/write operations
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*/
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Genode::Attached_dataspace _io_buffer;
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Io_buffer _io_buffer;
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public:
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public:
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Session_client(Genode::Capability<Session> cap)
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:
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Genode::Rpc_client<Session>(cap),
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_io_buffer(call<Rpc_dataspace>())
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{ }
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Session_client(Genode::Capability<Session> cap)
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:
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Genode::Rpc_client<Session>(cap),
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_io_buffer(call<Rpc_dataspace>())
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{ }
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Size size() { return call<Rpc_size>(); }
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Size size() { return call<Rpc_size>(); }
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bool avail() { return call<Rpc_avail>(); }
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bool avail() { return call<Rpc_avail>(); }
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Genode::size_t read(void *buf, Genode::size_t buf_size)
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{
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Genode::Lock::Guard _guard(_lock);
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Genode::size_t read(void *buf, Genode::size_t buf_size)
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{
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Genode::Lock::Guard _guard(_io_buffer.lock);
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/* instruct server to fill the I/O buffer */
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Genode::size_t num_bytes = call<Rpc_read>(buf_size);
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/* instruct server to fill the I/O buffer */
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Genode::size_t num_bytes = call<Rpc_read>(buf_size);
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/* copy-out I/O buffer */
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num_bytes = Genode::min(num_bytes, buf_size);
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Genode::memcpy(buf, _io_buffer.local_addr<char>(), num_bytes);
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/* copy-out I/O buffer */
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num_bytes = Genode::min(num_bytes, buf_size);
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Genode::memcpy(buf, _io_buffer.base, num_bytes);
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return num_bytes;
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}
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return num_bytes;
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Genode::size_t write(void const *buf, Genode::size_t num_bytes)
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{
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Genode::Lock::Guard _guard(_lock);
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Genode::size_t written_bytes = 0;
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char const * const src = (char const *)buf;
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while (written_bytes < num_bytes) {
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/* copy payload to I/O buffer */
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Genode::size_t n = Genode::min(num_bytes - written_bytes,
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_io_buffer.size());
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Genode::memcpy(_io_buffer.local_addr<char>(),
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src + written_bytes, n);
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/* tell server to pick up new I/O buffer content */
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call<Rpc_write>(n);
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written_bytes += n;
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}
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return num_bytes;
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}
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Genode::size_t write(void const *buf, Genode::size_t num_bytes)
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{
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Genode::Lock::Guard _guard(_io_buffer.lock);
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void connected_sigh(Genode::Signal_context_capability cap)
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{
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call<Rpc_connected_sigh>(cap);
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}
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Genode::size_t written_bytes = 0;
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char const * const src = (char const *)buf;
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void read_avail_sigh(Genode::Signal_context_capability cap)
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{
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call<Rpc_read_avail_sigh>(cap);
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}
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while (written_bytes < num_bytes) {
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/* copy payload to I/O buffer */
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Genode::size_t n = Genode::min(num_bytes - written_bytes,
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_io_buffer.size);
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Genode::memcpy(_io_buffer.base, src + written_bytes, n);
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/* tell server to pick up new I/O buffer content */
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call<Rpc_write>(n);
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written_bytes += n;
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}
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return num_bytes;
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}
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void connected_sigh(Genode::Signal_context_capability cap)
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{
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call<Rpc_connected_sigh>(cap);
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}
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void read_avail_sigh(Genode::Signal_context_capability cap)
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{
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call<Rpc_read_avail_sigh>(cap);
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}
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Genode::size_t io_buffer_size() const { return _io_buffer.size; }
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};
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}
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Genode::size_t io_buffer_size() const { return _io_buffer.size(); }
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};
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#endif /* _INCLUDE__TERMINAL_SESSION__CLIENT_H_ */
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