170 lines
3.5 KiB
C++
170 lines
3.5 KiB
C++
/*
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* \brief Dummy pager support for Genode
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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) 2009-2011 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__IPC_PAGER_H_
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#define _INCLUDE__BASE__IPC_PAGER_H_
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#include <base/ipc.h>
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#include <base/stdint.h>
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#include <base/native_types.h>
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namespace Genode {
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class Mapping
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{
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private:
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addr_t _from_phys_addr;
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addr_t _to_virt_addr;
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size_t _num_pages;
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bool _writeable;
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enum { PAGE_SIZE_LOG2 = 12 };
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public:
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/**
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* Constructor
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*/
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Mapping(addr_t dst_addr, addr_t src_addr,
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bool write_combined, unsigned l2size = PAGE_SIZE_LOG2,
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bool rw = true)
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:
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_from_phys_addr(src_addr),
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_to_virt_addr(dst_addr),
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_num_pages(1 << (l2size - PAGE_SIZE_LOG2)),
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_writeable(rw)
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{ }
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/**
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* Construct invalid mapping
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*/
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Mapping() : _num_pages(0) { }
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/**
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* Prepare map operation
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*
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* No preparations are needed on Codezero because all mapping
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* originate from the physical address space.
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*/
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void prepare_map_operation() { }
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addr_t from_phys() const { return _from_phys_addr; }
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addr_t to_virt() const { return _to_virt_addr; }
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size_t num_pages() const { return _num_pages; }
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bool writeable() const { return _writeable; }
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};
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/**
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* Special paging server class
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*/
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class Ipc_pager : public Native_capability
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{
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private:
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Native_thread_id _last; /* faulted thread */
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addr_t _pf_addr; /* page-fault address */
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addr_t _pf_ip; /* instruction pointer of faulter */
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bool _pf_write; /* true on write fault */
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Mapping _reply_mapping;
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// protected:
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//
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// /**
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// * Wait for pagefault
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// */
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// void _wait();
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//
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// /**
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// * Send page-fault reply and wait for next page fault
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// */
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// void _reply_and_wait();
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public:
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/**
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* Constructor
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*/
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Ipc_pager();
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/**
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* Wait for a new page fault received as short message IPC
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*/
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void wait_for_fault();
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/**
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* Reply current page-fault and wait for a new one
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*/
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void reply_and_wait_for_fault();
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/**
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* Request instruction pointer of current page fault
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*/
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addr_t fault_ip() { return _pf_ip; }
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/**
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* Request fault address of current page fault
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*/
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addr_t fault_addr() { return _pf_addr; }
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/**
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* Set parameters for next reply
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*/
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void set_reply_mapping(Mapping m) { _reply_mapping = m; }
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/**
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* Set destination for next reply
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*/
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void set_reply_dst(Native_capability pager_object) {
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_last = pager_object.local_name(); }
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/**
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* Answer call without sending a mapping
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*
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* This function is used to acknowledge local calls from one of
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* core's region-manager sessions.
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*/
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void acknowledge_wakeup();
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/**
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* Return thread ID of last faulter
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*/
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Native_thread_id last() const { return _last; }
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/**
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* Return badge for faulting thread
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*/
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unsigned long badge() const { return _last.tid; }
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/**
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* Return true if page fault was a write fault
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*/
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bool is_write_fault() const { return _pf_write; }
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/**
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* Return true if last fault was an exception
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*/
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bool is_exception() const
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{
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/*
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* Reflection of exceptions is not supported on this platform.
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*/
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return false;
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}
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};
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}
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#endif /* _INCLUDE__BASE__IPC_PAGER_H_ */
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