121 lines
2.3 KiB
C++
121 lines
2.3 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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#ifndef _LIBC_MMAP_REGISTRY_H_
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#define _LIBC_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/printf.h>
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/* libc-internal includes */
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#include <libc-plugin/plugin.h>
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/* libc includes */
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#include <errno.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 : Genode::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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Genode::List<Mmap_registry::Entry> _list;
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Genode::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, Genode::size_t len, Plugin *plugin)
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{
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Genode::Lock::Guard guard(_lock);
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if (_lookup_by_addr_unsynchronized(start)) {
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PINF("mmap region at %p is already registered", start);
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return;
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}
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_list.insert(new (Genode::env()->heap()) 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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Genode::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 is_registered(void *start) const
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{
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Genode::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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Genode::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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PWRN("lookup for address %p in in mmap registry failed", start);
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return;
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}
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_list.remove(e);
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destroy(Genode::env()->heap(), e);
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}
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};
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#endif /* _LIBC_MMAP_REGISTRY_H_ */
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