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155 lines
3.2 KiB
C++
155 lines
3.2 KiB
C++
/*
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* \brief Paging-server framework
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* \author Norman Feske
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* \date 2006-04-28
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*/
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/*
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* Copyright (C) 2006-2012 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__BASE__PAGER_H_
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#define _INCLUDE__BASE__PAGER_H_
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#include <base/thread.h>
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#include <base/object_pool.h>
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#include <base/ipc_pager.h>
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#include <base/capability.h>
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#include <cap_session/cap_session.h>
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#include <pager/capability.h>
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namespace Genode {
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class Pager_entrypoint;
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/*
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* On NOVA, each pager object is an EC that corresponds to one user thread.
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*/
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class Pager_object : public Object_pool<Pager_object>::Entry,
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Thread_base
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{
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private:
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void entry() { }
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void start() { }
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unsigned long _badge; /* used for debugging */
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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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int _exc_pt_sel; /* base of event portal window */
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int _pt_sel; /* portal selector for object identity */
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addr_t _initial_esp;
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addr_t _initial_eip;
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static void _page_fault_handler();
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static void _startup_handler();
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static void _invoke_handler();
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public:
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Pager_object(unsigned long badge);
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virtual ~Pager_object();
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unsigned long badge() const { return _badge; }
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virtual int pager(Ipc_pager &ps) = 0;
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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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* Return base of initial portal window
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*/
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int exc_pt_sel() { return _exc_pt_sel; }
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/**
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* Set initial stack pointer used by the startup handler
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*/
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void initial_esp(addr_t esp) { _initial_esp = esp; }
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/**
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* Set initial instruction pointer used by the startup handler
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*/
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void initial_eip(addr_t eip) { _initial_eip = eip; }
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/**
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* Return portal capability selector used for object identity
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*/
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int pt_sel() { return _pt_sel; }
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/**
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* Continue execution of pager object
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*/
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void wake_up();
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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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/**
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* Dummy pager activation
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*
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* Because on NOVA each pager object can be invoked separately,
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* there is no central pager activation.
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*/
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class Pager_activation_base { };
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template <int STACK_SIZE>
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class Pager_activation : public Pager_activation_base
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{ };
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/**
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* Dummy pager entrypoint
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*/
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class Pager_entrypoint : public Object_pool<Pager_object>
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{
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private:
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Cap_session *_cap_session;
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public:
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Pager_entrypoint(Cap_session *cap_session,
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Pager_activation_base *a = 0)
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: _cap_session(cap_session) { }
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/**
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* Return capability for 'Pager_object'
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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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}
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#endif /* _INCLUDE__BASE__PAGER_H_ */
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