77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
/*
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* \brief Core-local mapping
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* \author Norman Feske
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* \date 2010-02-15
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*/
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/*
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* Copyright (C) 2010-2012 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 _CORE__INCLUDE__MAP_LOCAL_H_
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#define _CORE__INCLUDE__MAP_LOCAL_H_
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/* core includes */
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#include <platform.h>
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#include <util.h>
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/* Fiasco includes */
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namespace Fiasco {
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#include <l4/sys/ipc.h>
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#include <l4/sys/syscalls.h>
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#include <l4/sys/kdebug.h>
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}
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namespace Genode {
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/**
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* Map page locally within core
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*
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* On Fiasco, all mapping originate from virtual addresses. At startup,
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* core obtains the whole memory sigma0 in a one-to-one fashion. Hence,
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* core-local addresses normally correspond to physical addresses.
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*
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* \param from_addr core-virtual source address
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* \param to_addr core-virtual destination address
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* \param num_pages number of pages to remap
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*/
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inline bool map_local(addr_t from_addr, addr_t to_addr, size_t num_pages)
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{
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Native_thread_id core_pager = platform_specific()->core_pager()->native_thread_id();
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addr_t offset = 0;
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size_t page_size = get_page_size();
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size_t page_size_log2 = get_page_size_log2();
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for (unsigned i = 0; i < num_pages; i++, offset += page_size) {
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using namespace Fiasco;
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/* perform echo request to the core pager */
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l4_umword_t dummy = 0;
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l4_msgdope_t ipc_result;
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l4_fpage_t from_fpage = l4_fpage(from_addr + offset,
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page_size_log2, true, false);
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enum { ECHO_LOCAL_MAP_REQUEST = 0 };
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l4_ipc_call(core_pager, L4_IPC_SHORT_MSG,
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from_fpage.raw, /* normally page-fault addr */
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ECHO_LOCAL_MAP_REQUEST, /* normally page-fault IP */
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L4_IPC_MAPMSG(to_addr + offset, page_size_log2),
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&dummy, &dummy,
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L4_IPC_NEVER, &ipc_result);
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if (L4_IPC_IS_ERROR(ipc_result)) {
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PWRN("could not locally remap 0x%lx to 0x%lx, error code is %ld",
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from_addr, to_addr, L4_IPC_ERROR(ipc_result));
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return false;
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}
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}
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return true;
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}
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}
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#endif /* _CORE__INCLUDE__MAP_LOCAL_H_ */
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