ca971bbfd8
This patch changes the top-level directory layout as a preparatory step for improving the tools for managing 3rd-party source codes. The rationale is described in the issue referenced below. Issue #1082
158 lines
3.0 KiB
C++
158 lines
3.0 KiB
C++
/*
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* \brief Mapping of Genode's capability names to kernel capabilities.
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* \author Alexander Boettcher
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* \date 2013-08-26
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*/
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/*
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* Copyright (C) 2013-2013 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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#include <base/cap_map.h>
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/* base-nova specific include */
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#include <nova/syscalls.h>
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using namespace Genode;
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Capability_map *Genode::cap_map() {
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static Genode::Capability_map map;
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return ↦
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}
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/***********************
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** Cap_index class **
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***********************/
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Cap_range *Cap_range::find_by_id(addr_t id)
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{
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if (_match(id)) return this;
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Cap_range *obj = this->child(id > _base);
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return obj ? obj->find_by_id(id) : 0;
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}
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void Cap_range::inc(unsigned id, bool inc_if_one) {
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Lock::Guard guard(_lock);
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if (inc_if_one && _cap_array[id] != 1)
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return;
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if (_cap_array[id] == 255) {
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// PERR("cap overflow - selector %lx - return address %p",
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// _base + id, __builtin_return_address(0));
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*reinterpret_cast<addr_t *>(0) = 0xdead;
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}
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_cap_array[id]++;
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}
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void Cap_range::dec(unsigned id, bool revoke) {
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Lock::Guard guard(_lock);
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if (_cap_array[id] == 0)
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*reinterpret_cast<addr_t *>(0) = 0xdead;
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if (revoke && _cap_array[id] == 1)
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Nova::revoke(Nova::Obj_crd(_base + id, 0));
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_cap_array[id]--;
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}
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addr_t Cap_range::alloc(size_t const num_log2)
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{
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addr_t const step = 1UL << num_log2;
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{
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Lock::Guard guard(_lock);
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unsigned max = elements();
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addr_t last = _last;
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do {
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/* align i to num_log2 */
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unsigned i = ((_base + last + step - 1) & ~(step - 1)) - _base;
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unsigned j;
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for (; i + step < max; i += step) {
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for (j = 0; j < step; j++)
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if (_cap_array[i+j])
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break;
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if (j < step)
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continue;
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for (j = 0; j < step; j++)
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_cap_array[i+j] = 1;
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_last = i;
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return _base + i;
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}
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max = last;
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last = 0;
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} while (max);
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}
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Cap_range *child = this->child(LEFT);
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if (child) {
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addr_t res = child->alloc(num_log2);
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if (res != ~0UL)
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return res;
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}
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child = this->child(RIGHT);
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if (child) {
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addr_t res = child->alloc(num_log2);
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return res;
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}
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return ~0UL;
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}
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/****************************
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** Capability_map class **
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****************************/
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Cap_index Capability_map::find(Genode::addr_t id) {
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return Cap_index(_tree.first() ? _tree.first()->find_by_id(id) : 0, id); }
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addr_t Capability_map::insert(size_t const num_log_2, addr_t const sel)
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{
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if (sel == ~0UL)
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return _tree.first() ? _tree.first()->alloc(num_log_2) : ~0UL;
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Cap_range * range = _tree.first() ? _tree.first()->find_by_id(sel) : 0;
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if (!range)
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return ~0UL;
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for (unsigned i = 0; i < 1UL << num_log_2; i++)
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range->inc(sel + i - range->base());
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return sel;
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}
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void Capability_map::remove(Genode::addr_t sel, uint8_t num_log_2, bool revoke)
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{
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Cap_range * range = _tree.first() ? _tree.first()->find_by_id(sel) : 0;
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if (!range)
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return;
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for (unsigned i = 0; i < 1UL << num_log_2; i++)
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range->dec(sel + i - range->base(), revoke);
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}
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