84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
/*
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* \brief VirtualBox memory manager (MMR3)
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* \author Norman Feske
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* \date 2013-08-20
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*/
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/*
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* Copyright (C) 2013-2017 Genode Labs GmbH
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*
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* This file is distributed under the terms of the GNU General Public License
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* version 2.
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*/
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#include <rm_session/rm_session.h>
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#include <rm_session/connection.h>
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#include <region_map/client.h>
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#include <util/retry.h>
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/**
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* Sub rm_session as backend for the Libc::Mem_alloc implementation.
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* Purpose is that memory allocation by vbox of a specific type (MMTYP) are
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* all located within a 2G virtual window. Reason is that virtualbox converts
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* internally pointers at several places in base + offset, whereby offset is
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* a int32_t type.
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*/
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class Sub_rm_connection : private Genode::Rm_connection,
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public Genode::Region_map_client
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{
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private:
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Genode::addr_t const _offset;
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Genode::size_t const _size;
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public:
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Sub_rm_connection(Genode::Env &env, Genode::size_t size)
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:
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Rm_connection(env),
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Genode::Region_map_client(Rm_connection::create(size)),
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_offset(env.rm().attach(dataspace())),
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_size(size)
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{ }
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Local_addr attach(Genode::Dataspace_capability ds,
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Genode::size_t size = 0, Genode::off_t offset = 0,
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bool use_local_addr = false,
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Local_addr local_addr = (void *)0,
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bool executable = false,
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bool writeable = true) override
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{
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Local_addr addr = Genode::retry<Genode::Out_of_ram>(
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[&] () {
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return Genode::retry<Genode::Out_of_caps>(
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[&] () {
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return Region_map_client::attach(ds, size, offset,
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use_local_addr,
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local_addr,
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executable,
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writeable); },
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[&] () { upgrade_caps(2); });
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},
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[&] () { upgrade_ram(8192); });
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Genode::addr_t new_addr = addr;
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new_addr += _offset;
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return Local_addr(new_addr);
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}
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bool contains(void * ptr) const
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{
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Genode::addr_t addr = reinterpret_cast<Genode::addr_t>(ptr);
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return (_offset <= addr && addr < _offset + _size);
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}
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bool contains(Genode::addr_t addr) const {
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return (_offset <= addr && addr < _offset + _size); }
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Genode::addr_t local_addr(Genode::addr_t addr) const {
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return _offset + addr; }
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};
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