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This patch integrates three region maps into each PD session to reduce the session overhead and to simplify the PD creation procedure. Please refer to the issue cited below for an elaborative discussion. Note the API change: With this patch, the semantics of core's RM service have changed. Now, the service is merely a tool for creating and destroying managed dataspaces, which are rarely needed. Regular components no longer need a RM session. For this reason, the corresponding argument for the 'Process' and 'Child' constructors has been removed. The former interface of the 'Rm_session' is not named 'Region_map'. As a minor refinement, the 'Fault_type' enum values are now part of the 'Region_map::State' struct. Issue #1938
58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
/*
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* \brief Client-side stub for region map
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* \author Christian Helmuth
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* \author Norman Feske
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* \date 2006-07-11
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*/
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/*
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* Copyright (C) 2006-2016 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__REGION_MAP__CLIENT_H_
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#define _INCLUDE__REGION_MAP__CLIENT_H_
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#include <base/rpc_client.h>
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#include <region_map/region_map.h>
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namespace Genode { class Region_map_client; }
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class Genode::Region_map_client : public Rpc_client<Region_map>
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{
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private:
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/*
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* Multiple calls to get the dataspace capability on NOVA lead to the
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* situation that the caller gets each time a new mapping of the same
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* capability at different indices. But the client/caller assumes to
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* get every time the very same index, e.g., in Noux the index is used
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* to look up data structures attached to the capability. Therefore, we
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* cache the dataspace capability on the first request.
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*
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* On all other base platforms, this member variable remains unused.
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*/
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Dataspace_capability _rm_ds_cap;
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public:
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explicit Region_map_client(Capability<Region_map>);
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Local_addr attach(Dataspace_capability ds, size_t size = 0,
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off_t offset = 0, bool use_local_addr = false,
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Local_addr local_addr = (void *)0,
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bool executable = false) override;
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void detach(Local_addr) override;
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Pager_capability add_client(Thread_capability) override;
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void remove_client(Pager_capability) override;
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void fault_handler(Signal_context_capability) override;
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State state() override;
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Dataspace_capability dataspace() override;
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};
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#endif /* _INCLUDE__REGION_MAP__CLIENT_H_ */
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