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97 lines
2.6 KiB
97 lines
2.6 KiB
// Copyright 2019 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "host-common/HostmemIdMapping.h"
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namespace android {
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namespace emulation {
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// static
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const HostmemIdMapping::Id HostmemIdMapping::kInvalidHostmemId = 0;
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static HostmemIdMapping* sMapping() {
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static HostmemIdMapping* s = new HostmemIdMapping;
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return s;
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}
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// static
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HostmemIdMapping* HostmemIdMapping::get() {
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return sMapping();
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}
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// TODO: Add registerHostmemFixed version that takes a predetermined id,
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// for snapshots
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HostmemIdMapping::Id HostmemIdMapping::add(uint64_t hva, uint64_t size, bool register_fixed, uint64_t fixed_id) {
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if (0 == hva || 0 == size) return kInvalidHostmemId;
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Id wantedId;
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if (register_fixed) {
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wantedId = fixed_id;
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mCurrentId = wantedId + 1;
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} else {
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wantedId = mCurrentId++;
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}
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HostmemIdMapping::Entry entry;
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entry.id = wantedId;
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entry.hva = hva;
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entry.size = size;
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mEntries.set(wantedId, entry);
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return wantedId;
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}
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void HostmemIdMapping::remove(HostmemIdMapping::Id id) {
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mEntries.erase(id);
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}
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HostmemIdMapping::Entry HostmemIdMapping::get(HostmemIdMapping::Id id) const {
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const HostmemIdMapping::Entry badEntry {
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kInvalidHostmemId, 0, 0,
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};
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if (kInvalidHostmemId == id) return badEntry;
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auto entry = mEntries.get(id);
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if (!entry) return badEntry;
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return *entry;
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}
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void HostmemIdMapping::clear() {
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mEntries.clear();
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}
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} // namespace android
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} // namespace emulation
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// C interface for use with vm operations
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extern "C" {
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uint64_t android_emulation_hostmem_register(uint64_t hva, uint64_t size, uint32_t register_fixed, uint64_t fixed_id) {
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return static_cast<uint64_t>(
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android::emulation::HostmemIdMapping::get()->add(hva, size, register_fixed, fixed_id));
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}
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void android_emulation_hostmem_unregister(uint64_t id) {
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android::emulation::HostmemIdMapping::get()->remove(id);
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}
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HostmemEntry android_emulation_hostmem_get_info(uint64_t id) {
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return static_cast<HostmemEntry>(
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android::emulation::HostmemIdMapping::get()->get(id));
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}
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} // extern "C"
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