1 // Copyright 2019 The Android Open Source Project 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 #include "host-common/HostmemIdMapping.h" 15 16 namespace android { 17 namespace emulation { 18 19 // static 20 const HostmemIdMapping::Id HostmemIdMapping::kInvalidHostmemId = 0; 21 sMapping()22static HostmemIdMapping* sMapping() { 23 static HostmemIdMapping* s = new HostmemIdMapping; 24 return s; 25 } 26 27 // static get()28HostmemIdMapping* HostmemIdMapping::get() { 29 return sMapping(); 30 } 31 32 // TODO: Add registerHostmemFixed version that takes a predetermined id, 33 // for snapshots add(const struct MemEntry * entry)34HostmemIdMapping::Id HostmemIdMapping::add(const struct MemEntry *entry) { 35 if (entry->hva == 0 || entry->size == 0) return kInvalidHostmemId; 36 37 Id wantedId; 38 39 if (entry->register_fixed) { 40 wantedId = entry->fixed_id; 41 mCurrentId = wantedId + 1; 42 } else { 43 wantedId = mCurrentId++; 44 } 45 46 HostmemIdMapping::Entry hostmem_entry; 47 hostmem_entry.id = wantedId; 48 hostmem_entry.hva = entry->hva; 49 hostmem_entry.size = entry->size; 50 hostmem_entry.caching = entry->caching; 51 mEntries.set(wantedId, hostmem_entry); 52 return wantedId; 53 } 54 remove(HostmemIdMapping::Id id)55void HostmemIdMapping::remove(HostmemIdMapping::Id id) { 56 mEntries.erase(id); 57 } 58 get(HostmemIdMapping::Id id) const59HostmemIdMapping::Entry HostmemIdMapping::get(HostmemIdMapping::Id id) const { 60 const HostmemIdMapping::Entry badEntry { 61 kInvalidHostmemId, 0, 0, 62 }; 63 64 if (kInvalidHostmemId == id) return badEntry; 65 66 auto entry = mEntries.get(id); 67 68 if (!entry) return badEntry; 69 70 return *entry; 71 } 72 clear()73void HostmemIdMapping::clear() { 74 mEntries.clear(); 75 } 76 77 } // namespace android 78 } // namespace emulation 79 80 // C interface for use with vm operations 81 extern "C" { 82 android_emulation_hostmem_register(const struct MemEntry * entry)83uint64_t android_emulation_hostmem_register(const struct MemEntry *entry) { 84 return static_cast<uint64_t>( 85 android::emulation::HostmemIdMapping::get()->add(entry)); 86 } 87 android_emulation_hostmem_unregister(uint64_t id)88void android_emulation_hostmem_unregister(uint64_t id) { 89 android::emulation::HostmemIdMapping::get()->remove(id); 90 } 91 android_emulation_hostmem_get_info(uint64_t id)92HostmemEntry android_emulation_hostmem_get_info(uint64_t id) { 93 return static_cast<HostmemEntry>( 94 android::emulation::HostmemIdMapping::get()->get(id)); 95 } 96 97 } // extern "C" 98