21de42c45d
The new core-internal 'Address_space' interface enables cores RM service to flush mappings of a PD in which a given 'Rm_client' thread resides. Prior this patch, each platform invented their own way to flush mappings in the respective 'rm_session_support.cc' implementation. However, those implementations used to deal poorly with some corner cases. In particular, if a PD session was destroyed prior a RM session, the RM session would try to use no longer existing PD session. The new 'Address_space' uses the just added weak-pointer mechanism to deal with this issue. Furthermore, the generic 'Rm_session_component::detach' function has been improved to avoid duplicated unmap operations for platforms that implement the 'Address_space' interface. Therefore, it is related to issue #595. Right now, this is OKL4 only, but other platforms will follow.
107 lines
2.2 KiB
C++
107 lines
2.2 KiB
C++
/*
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* \brief Protection-domain facility
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* \author Norman Feske
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* \date 2009-10-02
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*/
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/*
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* Copyright (C) 2009-2013 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 _CORE__INCLUDE__PLATFORM_PD_H_
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#define _CORE__INCLUDE__PLATFORM_PD_H_
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#include <platform_thread.h>
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#include <address_space.h>
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/*
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* Must be initialized by the startup code,
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* only valid in core
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*/
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extern Genode::addr_t __core_pd_sel;
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namespace Genode {
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class Platform_thread;
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class Platform_pd : public Address_space
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{
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private:
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Native_capability _parent;
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int _thread_cnt;
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addr_t _pd_sel;
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public:
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/**
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* Constructors
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*/
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Platform_pd(signed pd_id = -1, bool create = true);
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/**
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* Destructor
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*/
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~Platform_pd();
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/**
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* Bind thread to protection domain
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*
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* \return 0 on success or
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* -1 if thread ID allocation failed.
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*/
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int bind_thread(Platform_thread *thread);
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/**
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* Unbind thread from protection domain
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*
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* Free the thread's slot and update thread object.
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*/
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void unbind_thread(Platform_thread *thread);
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/**
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* Assign parent interface to protection domain
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*/
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int assign_parent(Native_capability parent);
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/**
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* Return portal capability selector for parent interface
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*/
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addr_t parent_pt_sel() { return _parent.local_name(); }
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/**
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* Assign PD selector to PD
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*/
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void assign_pd(addr_t pd_sel) { _pd_sel = pd_sel; }
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/**
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* Capability selector of this task.
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*
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* \return PD selector
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*/
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addr_t pd_sel() { return _pd_sel; }
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/**
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* Capability selector of core protection domain
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*
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* \return PD selector
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*/
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static addr_t pd_core_sel() { return __core_pd_sel; }
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/*****************************
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** Address-space interface **
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*****************************/
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/*
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* On NOVA, we don't use directed unmap but rely on the
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* in-kernel mapping database. See 'rm_session_support.cc'.
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*/
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void flush(addr_t, size_t) { PDBG("not implemented"); }
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};
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}
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#endif /* _CORE__INCLUDE__PLATFORM_PD_H_ */
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