648bcd1505
This patch unifies the patterns of using the 'Genode' and 'Libc' namespaces. Types defined in the 'internal/' headers reside in the 'Libc' namespace. The code in the headers does not need to use the 'Libc::' prefix. Compilation units import the 'Libc' namespace after the definition of local types. Local types reside in the 'Libc' namespace (and should eventually move to an 'internal/' header). Since the 'Libc' namespace imports the 'Genode' namespace, there is no need to use the 'Genode::' prefix. Consequently, code in the compilation units rarely need to qualify the 'Genode' or 'Libc' namespaces. There are a few cases where the 'Libc', the 'Genode', and the global (libc) namespaces are ambigious. In these cases, an explicit clarification is needed: - 'Genode::Allocator' differs from 'Libc::Allocator'. - 'Genode::Env' differs from 'Libc::Env'. - Genode's string functions (strcmp, memcpy, strcpy) conflict with the names of the (global) libc functions. - There exist both 'Genode::uint64_t' and the libc'c 'uint64_t'. Issue #3497
134 lines
2.6 KiB
C++
134 lines
2.6 KiB
C++
/*
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* \brief Registry for keeping track of mmapped regions
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* \author Norman Feske
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* \date 2012-08-16
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*/
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/*
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* Copyright (C) 2012-2019 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 Affero General Public License version 3.
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*/
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#ifndef _LIBC__INTERNAL__MMAP_REGISTRY_H_
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#define _LIBC__INTERNAL__MMAP_REGISTRY_H_
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/* Genode includes */
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#include <base/lock.h>
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#include <base/env.h>
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#include <base/log.h>
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#include <libc/allocator.h>
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/* libc includes */
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#include <errno.h>
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#include <libc-plugin/plugin.h>
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/* libc-internal includes */
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#include <internal/types.h>
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namespace Libc {
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class Mmap_registry;
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/**
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* Return singleton instance of mmap registry
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*/
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Mmap_registry *mmap_registry();
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}
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class Libc::Mmap_registry
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{
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public:
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struct Entry : List<Entry>::Element
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{
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void * const start;
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Plugin * const plugin;
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Entry(void *start, Plugin *plugin)
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: start(start), plugin(plugin) { }
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};
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private:
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Libc::Allocator _md_alloc;
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List<Mmap_registry::Entry> _list;
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Lock mutable _lock;
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/*
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* Common for both const and non-const lookup functions
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*/
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template <typename ENTRY>
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static ENTRY *_lookup_by_addr_unsynchronized(ENTRY *curr, void * const start)
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{
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for (; curr; curr = curr->next())
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if (curr->start == start)
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return curr;
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return 0;
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}
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Entry const *_lookup_by_addr_unsynchronized(void * const start) const
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{
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return _lookup_by_addr_unsynchronized(_list.first(), start);
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}
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Entry *_lookup_by_addr_unsynchronized(void * const start)
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{
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return _lookup_by_addr_unsynchronized(_list.first(), start);
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}
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public:
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void insert(void *start, size_t len, Plugin *plugin)
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{
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Lock::Guard guard(_lock);
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if (_lookup_by_addr_unsynchronized(start)) {
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warning(__func__, ": mmap region at ", start, " "
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"is already registered");
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return;
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}
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_list.insert(new (&_md_alloc) Entry(start, plugin));
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}
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Plugin *lookup_plugin_by_addr(void *start) const
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{
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Lock::Guard guard(_lock);
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Entry const * const e = _lookup_by_addr_unsynchronized(start);
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return e ? e->plugin : 0;
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}
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bool registered(void *start) const
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{
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Lock::Guard guard(_lock);
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return _lookup_by_addr_unsynchronized(start) != 0;
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}
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void remove(void *start)
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{
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Lock::Guard guard(_lock);
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Entry *e = _lookup_by_addr_unsynchronized(start);
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if (!e) {
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warning("lookup for address ", start, " "
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"in in mmap registry failed");
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return;
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}
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_list.remove(e);
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destroy(&_md_alloc, e);
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}
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};
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#endif /* _LIBC__INTERNAL__MMAP_REGISTRY_H_ */
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