227 lines
5.1 KiB
C++
227 lines
5.1 KiB
C++
/*
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* \brief Fiasco.oc platform-specific capability allocation
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* \author Stefan Kalkowski
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* \date 2011-01-13
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*/
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/*
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* Copyright (C) 2011-2013 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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/* Genode includes */
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#include <base/capability.h>
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#include <base/cap_alloc.h>
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#include <util/misc_math.h>
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/* core includes */
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#include <cap_session_component.h>
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#include <cap_id_alloc.h>
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#include <cap_index.h>
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#include <platform.h>
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namespace Fiasco {
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#include <l4/sys/consts.h>
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#include <l4/sys/debugger.h>
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#include <l4/sys/factory.h>
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#include <l4/sys/task.h>
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#include <l4/sys/types.h>
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}
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#include <util/assert.h>
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using namespace Genode;
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/***************************
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** Cap_index_allocator **
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***************************/
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Genode::Cap_index_allocator* Genode::cap_idx_alloc()
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{
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static Genode::Cap_index_allocator_tpl<Core_cap_index,10*1024> alloc;
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return &alloc;
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}
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/*******************
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** Cap_mapping **
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*******************/
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Core_cap_index* Cap_mapping::_get_cap()
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{
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int id = platform_specific()->cap_id_alloc()->alloc();
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return static_cast<Core_cap_index*>(cap_map()->insert(id));
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}
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void Cap_mapping::map(Native_thread_id task)
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{
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using namespace Fiasco;
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if (!local.valid() || !Fiasco::Capability::valid(remote))
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return;
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l4_msgtag_t tag = l4_task_map(task, L4_BASE_TASK_CAP,
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l4_obj_fpage(local.dst(), 0, L4_FPAGE_RWX),
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((l4_cap_idx_t)remote) | L4_ITEM_MAP);
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if (l4_msgtag_has_error(tag))
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PERR("mapping cap failed");
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}
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Cap_mapping::Cap_mapping(bool alloc, Native_thread_id r)
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: local(alloc ? _get_cap() : 0), remote(r) { }
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Cap_mapping::Cap_mapping(Native_capability cap, Native_thread_id r)
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: local(cap), remote(r) { }
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/*****************************
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** Cap_session_component **
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*****************************/
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Native_capability Cap_session_component::alloc(Cap_session_component *session,
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Native_capability ep)
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{
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Native_capability cap;
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if (!ep.valid()) {
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PWRN("Invalid cap!");
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return cap;
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}
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try {
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using namespace Fiasco;
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Core_cap_index* ref = static_cast<Core_cap_index*>(ep.idx());
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ASSERT(ref && ref->pt(), "No valid platform_thread");
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/*
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* Allocate new id, and ipc-gate and set id as gate-label
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*/
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unsigned long id = platform_specific()->cap_id_alloc()->alloc();
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Core_cap_index* idx = static_cast<Core_cap_index*>(cap_map()->insert(id));
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if (!idx) {
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PWRN("Out of capabilities!");
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platform_specific()->cap_id_alloc()->free(id);
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return cap;
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}
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l4_msgtag_t tag = l4_factory_create_gate(L4_BASE_FACTORY_CAP,
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idx->kcap(),
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ref->pt()->thread().local.dst(), id);
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if (l4_msgtag_has_error(tag)) {
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PERR("l4_factory_create_gate failed!");
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cap_map()->remove(idx);
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platform_specific()->cap_id_alloc()->free(id);
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return cap;
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} else
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/* set debugger-name of ipc-gate to thread's name */
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Fiasco::l4_debugger_set_object_name(idx->kcap(), ref->pt()->name());
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idx->session(session);
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idx->pt(ref->pt());
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idx->inc();
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cap = Native_capability(idx);
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} catch (Cap_id_allocator::Out_of_ids) {
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PERR("Out of IDs");
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}
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return cap;
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}
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Native_capability Cap_session_component::alloc(Native_capability ep)
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{
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return Cap_session_component::alloc(this, ep);
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}
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void Cap_session_component::free(Native_capability cap)
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{
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using namespace Fiasco;
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if (!cap.valid())
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return;
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Core_cap_index* idx = static_cast<Core_cap_index*>(cap.idx());
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/*
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* check whether this cap_session has created the capability to delete.
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*/
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if (idx->session() != this)
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return;
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idx->dec();
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}
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/*******************************
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** Capability ID Allocator **
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*******************************/
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Cap_id_allocator::Cap_id_allocator(Allocator* alloc)
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: _id_alloc(alloc)
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{
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_id_alloc.add_range(CAP_ID_OFFSET, CAP_ID_RANGE);
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}
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unsigned long Cap_id_allocator::alloc()
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{
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Lock::Guard lock_guard(_lock);
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void *id;
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if (_id_alloc.alloc(CAP_ID_OFFSET, &id))
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return (unsigned long) id;
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throw Out_of_ids();
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}
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void Cap_id_allocator::free(unsigned long id)
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{
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Lock::Guard lock_guard(_lock);
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if (id < CAP_ID_RANGE)
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_id_alloc.free((void*)(id & CAP_ID_MASK), CAP_ID_OFFSET);
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}
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void Genode::Capability_map::remove(Genode::Cap_index* i)
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{
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using namespace Genode;
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using namespace Fiasco;
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Lock_guard<Spin_lock> guard(_lock);
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if (i) {
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Core_cap_index* e = static_cast<Core_cap_index*>(_tree.first() ? _tree.first()->find_by_id(i->id()) : 0);
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if (e == i) {
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l4_msgtag_t tag = l4_task_unmap(L4_BASE_TASK_CAP,
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l4_obj_fpage(i->kcap(), 0, L4_FPAGE_RWX),
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L4_FP_ALL_SPACES | L4_FP_DELETE_OBJ);
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if (l4_msgtag_has_error(tag))
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PERR("destruction of ipc-gate %lx failed!", (unsigned long) i->kcap());
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platform_specific()->cap_id_alloc()->free(i->id());
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_tree.remove(i);
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}
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cap_idx_alloc()->free(i, 1);
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}
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}
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Genode::Cap_index_allocator* cap_idx_alloc()
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{
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static Genode::Cap_index_allocator_tpl<Core_cap_index, 20*1024> _alloc;
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return &_alloc;
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}
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