1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #define LOG_TAG "MemoryHeapBase" 18 19 #include <stdlib.h> 20 #include <stdint.h> 21 #include <unistd.h> 22 #include <fcntl.h> 23 #include <errno.h> 24 #include <sys/types.h> 25 #include <sys/stat.h> 26 #include <sys/ioctl.h> 27 28 #include <cutils/log.h> 29 #include <cutils/ashmem.h> 30 #include <cutils/atomic.h> 31 32 #include <binder/MemoryHeapBase.h> 33 34 namespace android { 35 36 // --------------------------------------------------------------------------- 37 38 MemoryHeapBase::MemoryHeapBase() 39 : mFD(-1), mSize(0), mBase(MAP_FAILED), 40 mDevice(NULL), mNeedUnmap(false), mOffset(0) 41 { 42 } 43 44 MemoryHeapBase::MemoryHeapBase(size_t size, uint32_t flags, char const * name) 45 : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags), 46 mDevice(0), mNeedUnmap(false), mOffset(0) 47 { 48 const size_t pagesize = getpagesize(); 49 size = ((size + pagesize-1) & ~(pagesize-1)); 50 int fd = ashmem_create_region(name == NULL ? "MemoryHeapBase" : name, size); 51 ALOGE_IF(fd<0, "error creating ashmem region: %s", strerror(errno)); 52 if (fd >= 0) { 53 if (mapfd(fd, size) == NO_ERROR) { 54 if (flags & READ_ONLY) { 55 ashmem_set_prot_region(fd, PROT_READ); 56 } 57 } 58 } 59 } 60 61 MemoryHeapBase::MemoryHeapBase(const char* device, size_t size, uint32_t flags) 62 : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags), 63 mDevice(0), mNeedUnmap(false), mOffset(0) 64 { 65 int open_flags = O_RDWR; 66 if (flags & NO_CACHING) 67 open_flags |= O_SYNC; 68 69 int fd = open(device, open_flags); 70 ALOGE_IF(fd<0, "error opening %s: %s", device, strerror(errno)); 71 if (fd >= 0) { 72 const size_t pagesize = getpagesize(); 73 size = ((size + pagesize-1) & ~(pagesize-1)); 74 if (mapfd(fd, size) == NO_ERROR) { 75 mDevice = device; 76 } 77 } 78 } 79 80 MemoryHeapBase::MemoryHeapBase(int fd, size_t size, uint32_t flags, uint32_t offset) 81 : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags), 82 mDevice(0), mNeedUnmap(false), mOffset(0) 83 { 84 const size_t pagesize = getpagesize(); 85 size = ((size + pagesize-1) & ~(pagesize-1)); 86 mapfd(dup(fd), size, offset); 87 } 88 89 status_t MemoryHeapBase::init(int fd, void *base, int size, int flags, const char* device) 90 { 91 if (mFD != -1) { 92 return INVALID_OPERATION; 93 } 94 mFD = fd; 95 mBase = base; 96 mSize = size; 97 mFlags = flags; 98 mDevice = device; 99 return NO_ERROR; 100 } 101 102 status_t MemoryHeapBase::mapfd(int fd, size_t size, uint32_t offset) 103 { 104 if (size == 0) { 105 // try to figure out the size automatically 106 struct stat sb; 107 if (fstat(fd, &sb) == 0) 108 size = sb.st_size; 109 // if it didn't work, let mmap() fail. 110 } 111 112 if ((mFlags & DONT_MAP_LOCALLY) == 0) { 113 void* base = (uint8_t*)mmap(0, size, 114 PROT_READ|PROT_WRITE, MAP_SHARED, fd, offset); 115 if (base == MAP_FAILED) { 116 ALOGE("mmap(fd=%d, size=%u) failed (%s)", 117 fd, uint32_t(size), strerror(errno)); 118 close(fd); 119 return -errno; 120 } 121 //ALOGD("mmap(fd=%d, base=%p, size=%lu)", fd, base, size); 122 mBase = base; 123 mNeedUnmap = true; 124 } else { 125 mBase = 0; // not MAP_FAILED 126 mNeedUnmap = false; 127 } 128 mFD = fd; 129 mSize = size; 130 mOffset = offset; 131 return NO_ERROR; 132 } 133 134 MemoryHeapBase::~MemoryHeapBase() 135 { 136 dispose(); 137 } 138 139 void MemoryHeapBase::dispose() 140 { 141 int fd = android_atomic_or(-1, &mFD); 142 if (fd >= 0) { 143 if (mNeedUnmap) { 144 //ALOGD("munmap(fd=%d, base=%p, size=%lu)", fd, mBase, mSize); 145 munmap(mBase, mSize); 146 } 147 mBase = 0; 148 mSize = 0; 149 close(fd); 150 } 151 } 152 153 int MemoryHeapBase::getHeapID() const { 154 return mFD; 155 } 156 157 void* MemoryHeapBase::getBase() const { 158 return mBase; 159 } 160 161 size_t MemoryHeapBase::getSize() const { 162 return mSize; 163 } 164 165 uint32_t MemoryHeapBase::getFlags() const { 166 return mFlags; 167 } 168 169 const char* MemoryHeapBase::getDevice() const { 170 return mDevice; 171 } 172 173 uint32_t MemoryHeapBase::getOffset() const { 174 return mOffset; 175 } 176 177 // --------------------------------------------------------------------------- 178 }; // namespace android 179
