79 lines
1.7 KiB
C++
79 lines
1.7 KiB
C++
/*
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* \brief Address-to-page mapping helper
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* \author Sebastian Sumpf
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* \author Josef Soentgen
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* \author Norman Feske
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* \date 2014-10-10
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*/
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/*
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* Copyright (C) 2014 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 _LX_EMUL__IMPL__INTERNAL__ADDR_TO_PAGE_MAPPING_H_
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#define _LX_EMUL__IMPL__INTERNAL__ADDR_TO_PAGE_MAPPING_H_
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/* Linux emulation environment includes */
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#include <lx_emul/impl/internal/malloc.h>
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#include <lx_emul/impl/internal/list.h>
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namespace Lx { class Addr_to_page_mapping; }
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class Lx::Addr_to_page_mapping : public Lx::List<Addr_to_page_mapping>::Element
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{
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private:
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unsigned long _addr { 0 };
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struct page *_page { 0 };
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static Genode::List<Addr_to_page_mapping> *_list()
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{
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static Genode::List<Addr_to_page_mapping> _l;
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return &_l;
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}
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public:
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Addr_to_page_mapping(unsigned long addr, struct page *page)
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: _addr(addr), _page(page) { }
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static void insert(struct page *page)
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{
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Addr_to_page_mapping *m = (Addr_to_page_mapping*)
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Lx::Malloc::mem().alloc(sizeof (Addr_to_page_mapping));
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m->_addr = (unsigned long)page->addr;
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m->_page = page;
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_list()->insert(m);
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}
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static void remove(struct page *page)
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{
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Addr_to_page_mapping *mp = 0;
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for (Addr_to_page_mapping *m = _list()->first(); m; m = m->next())
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if (m->_page == page)
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mp = m;
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if (mp) {
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_list()->remove(mp);
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Lx::Malloc::mem().free(mp);
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}
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}
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static struct page* find_page(unsigned long addr)
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{
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for (Addr_to_page_mapping *m = _list()->first(); m; m = m->next())
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if (m->_addr == addr)
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return m->_page;
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return 0;
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}
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};
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#endif /* _LX_EMUL__IMPL__INTERNAL__ADDR_TO_PAGE_MAPPING_H_ */
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