103 lines
2.6 KiB
C++
103 lines
2.6 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) 2010-2013 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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#include <base/printf.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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/* Pistachio includes */
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namespace Pistachio {
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#include <l4/space.h>
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#include <l4/types.h>
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#include <l4/ipc.h>
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#include <l4/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 Pistachio, 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 static bool map_local(addr_t from_addr, addr_t to_addr, size_t num_pages)
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{
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Pistachio::L4_ThreadId_t 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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for (unsigned i = 0; i < num_pages; i++, offset += page_size) {
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using namespace Pistachio;
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L4_Fpage_t fpage = L4_Fpage(from_addr + offset, page_size);
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fpage += L4_FullyAccessible;
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L4_MapItem_t map_item = L4_MapItem(fpage, 0);
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/* assemble local echo mapping request */
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L4_Msg_t msg;
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L4_Word_t echo_request = 0, item_addr = (addr_t)&map_item;
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L4_Clear(&msg);
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L4_Append(&msg, item_addr);
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L4_Append(&msg, echo_request);
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msg.tag.X.u = 2;
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/* setup receive window */
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L4_Fpage_t rcv_fpage = L4_Fpage(to_addr + offset, page_size);
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L4_Accept(L4_MapGrantItems(rcv_fpage));
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L4_Load(&msg);
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L4_MsgTag_t result = L4_Call(core_pager);
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if (L4_IpcFailed(result)) {
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warning("could not locally remap ", (void*)from_addr, " to ",
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(void*)to_addr, ", error code is ", L4_ErrorCode());
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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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* Unmap pages locally within core
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*
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* \param virt core-local address
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* \param num_pages number of pages to unmap
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*/
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inline void unmap_local(addr_t virt, size_t num_pages)
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{
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size_t page_size = get_page_size();
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addr_t offset = 0;
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for (unsigned i = 0; i < num_pages; i++, offset += page_size) {
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using namespace Pistachio;
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L4_Fpage_t fpage = L4_Fpage(virt + offset, page_size);
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fpage += L4_FullyAccessible;
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L4_Flush(fpage);
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}
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}
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}
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#endif /* _CORE__INCLUDE__MAP_LOCAL_H_ */
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