127 lines
2.9 KiB
C++
127 lines
2.9 KiB
C++
/*
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* \brief Capability allocation service
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* \author Alexander Boettcher
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* \date 2012-07-27
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*/
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/*
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* Copyright (C) 2006-2013 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__CAP_SESSION_COMPONENT_H_
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#define _CORE__INCLUDE__CAP_SESSION_COMPONENT_H_
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#include <cap_session/cap_session.h>
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#include <base/rpc_server.h>
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#include <base/lock.h>
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/* core includes */
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#include <platform_pd.h>
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namespace Genode {
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class Cap_session_component : public Rpc_object<Cap_session>
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{
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private:
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struct Cap_object : List<Cap_object>::Element
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{
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Genode::addr_t _cap_sel;
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Cap_object(addr_t cap_sel) : _cap_sel(cap_sel) {}
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};
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Tslab<Cap_object, 128> _cap_slab;
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List<Cap_object> _cap_list;
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Lock _cap_lock;
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public:
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/**
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* Constructor
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*/
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Cap_session_component(Allocator *md_alloc, const char *args)
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: _cap_slab(md_alloc) { }
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/**
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* Destructor
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*/
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~Cap_session_component()
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{
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Lock::Guard cap_lock(_cap_lock);
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for (Cap_object *obj; (obj = _cap_list.first()); ) {
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Nova::revoke(Nova::Obj_crd(obj->_cap_sel, 0));
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cap_map()->remove(obj->_cap_sel, 0, false);
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_cap_list.remove(obj);
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destroy(&_cap_slab, obj);
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}
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}
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void upgrade_ram_quota(size_t ram_quota) { }
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Native_capability alloc(Native_capability ep, addr_t entry,
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addr_t mtd)
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{
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addr_t pt_sel = cap_map()->insert();
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addr_t pd_sel = Platform_pd::pd_core_sel();
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addr_t ec_sel = ep.local_name();
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using namespace Nova;
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Lock::Guard cap_lock(_cap_lock);
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/* create cap object */
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Cap_object * pt_cap = new (&_cap_slab) Cap_object(pt_sel);
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if (!pt_cap)
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return Native_capability::invalid_cap();
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_cap_list.insert(pt_cap);
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/* create portal */
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uint8_t res = create_pt(pt_sel, pd_sel, ec_sel, Mtd(mtd),
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entry);
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if (res == NOVA_OK)
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return Native_capability(pt_sel);
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PERR("cap_session - cap=%lx:%lx"
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" addr=%lx flags=%lx xpt=%lx res=%u",
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ec_sel, ep.local_name(),
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entry, mtd, pt_sel, res);
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_cap_list.remove(pt_cap);
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destroy(&_cap_slab, pt_cap);
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/* cleanup unused selectors */
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cap_map()->remove(pt_sel, 0, false);
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return Native_capability::invalid_cap();
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}
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void free(Native_capability cap)
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{
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if (!cap.valid()) return;
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Lock::Guard cap_lock(_cap_lock);
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for (Cap_object *obj = _cap_list.first(); obj ; obj = obj->next()) {
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if (cap.local_name() == obj->_cap_sel) {
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Nova::revoke(Nova::Obj_crd(obj->_cap_sel, 0));
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cap_map()->remove(obj->_cap_sel, 0, false);
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_cap_list.remove(obj);
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destroy(&_cap_slab, obj);
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return;
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}
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}
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PDBG("invalid cap object");
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}
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};
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}
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#endif /* _CORE__INCLUDE__CAP_SESSION_COMPONENT_H_ */
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