171 lines
3.6 KiB
C++
171 lines
3.6 KiB
C++
/*
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* \brief Paging-server framework
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* \author Norman Feske
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* \author Christian Helmuth
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* \author Stefan Kalkowski
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* \date 2006-04-28
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*/
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/*
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* Copyright (C) 2006-2015 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__PAGER_H_
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#define _CORE__INCLUDE__PAGER_H_
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#include <base/thread.h>
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#include <base/object_pool.h>
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#include <cap_session/cap_session.h>
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#include <pager/capability.h>
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#include <ipc_pager.h>
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namespace Genode {
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/**
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* Special server object for paging
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*
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* A 'Pager_object' is very similar to a 'Rpc_object'. It is just a
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* special implementation for page-fault handling, which does not allow to
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* define a "badge" for pager capabilities.
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*/
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class Pager_object;
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/**
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* Paging entry point
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*/
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class Pager_entrypoint;
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enum { PAGER_EP_STACK_SIZE = sizeof(addr_t) * 2048 };
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}
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class Genode::Pager_object : public Object_pool<Pager_object>::Entry
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{
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protected:
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/**
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* Local name for this pager object
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*/
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unsigned long _badge;
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Thread_capability _thread_cap;
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/**
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* User-level signal handler registered for this pager object via
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* 'Cpu_session::exception_handler()'.
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*/
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Signal_context_capability _exception_sigh;
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public:
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/**
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* Contains information about exception state of corresponding thread.
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*/
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Thread_state state;
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/**
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* Constructor
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*
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* \param location affinity of paged thread to physical CPU
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*/
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Pager_object(unsigned long badge, Affinity::Location location)
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: _badge(badge) { }
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virtual ~Pager_object() { }
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unsigned long badge() const { return _badge; }
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/**
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* Interface to be implemented by a derived class
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*
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* \param ps 'Ipc_pager' stream
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*
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* Returns !0 on error and pagefault will not be answered.
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*/
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virtual int pager(Ipc_pager &ps) = 0;
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/**
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* Wake up the faulter
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*/
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void wake_up();
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/**
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* Assign user-level exception handler for the pager object
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*/
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void exception_handler(Signal_context_capability sigh)
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{
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_exception_sigh = sigh;
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}
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/**
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* Notify exception handler about the occurrence of an exception
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*/
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void submit_exception_signal()
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{
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if (!_exception_sigh.valid()) return;
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Signal_transmitter transmitter(_exception_sigh);
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transmitter.submit();
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}
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/**
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* Remember thread cap so that rm_session can tell thread that
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* rm_client is gone.
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*/
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Thread_capability thread_cap() { return _thread_cap; } const
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void thread_cap(Thread_capability cap) { _thread_cap = cap; }
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/*
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* Note in the thread state that an unresolved page
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* fault occurred.
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*/
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void unresolved_page_fault_occurred();
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};
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class Genode::Pager_entrypoint : public Object_pool<Pager_object>,
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public Thread<PAGER_EP_STACK_SIZE>
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{
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private:
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Ipc_pager _pager;
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Cap_session *_cap_session;
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Untyped_capability _manage(Pager_object *obj);
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public:
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/**
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* Constructor
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*
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* \param cap_session Cap_session for creating capabilities
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* for the pager objects managed by this
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* entry point
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*/
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Pager_entrypoint(Cap_session *cap_session)
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: Thread<PAGER_EP_STACK_SIZE>("pager_ep"),
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_cap_session(cap_session) { start(); }
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/**
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* Associate Pager_object with the entry point
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*/
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Pager_capability manage(Pager_object *obj);
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/**
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* Dissolve Pager_object from entry point
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*/
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void dissolve(Pager_object *obj);
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/**********************
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** Thread interface **
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**********************/
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void entry();
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};
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#endif /* _CORE__INCLUDE__PAGER_H_ */
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