2 * Copyright (C) 2008 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #define LOG_TAG "MemoryHeapBase"
24 #include <sys/types.h>
26 #include <sys/ioctl.h>
28 #include <cutils/log.h>
29 #include <cutils/ashmem.h>
30 #include <cutils/atomic.h>
32 #include <binder/MemoryHeapBase.h>
35 #include <linux/android_pmem.h>
41 // ---------------------------------------------------------------------------
43 MemoryHeapBase::MemoryHeapBase()
44 : mFD(-1), mSize(0), mBase(MAP_FAILED),
45 mDevice(NULL), mNeedUnmap(false)
49 MemoryHeapBase::MemoryHeapBase(size_t size, uint32_t flags, char const * name)
50 : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
51 mDevice(0), mNeedUnmap(false)
53 const size_t pagesize = getpagesize();
54 size = ((size + pagesize-1) & ~(pagesize-1));
55 int fd = ashmem_create_region(name == NULL ? "MemoryHeapBase" : name, size);
56 LOGE_IF(fd<0, "error creating ashmem region: %s", strerror(errno));
58 if (mapfd(fd, size) == NO_ERROR) {
59 if (flags & READ_ONLY) {
60 ashmem_set_prot_region(fd, PROT_READ);
66 MemoryHeapBase::MemoryHeapBase(const char* device, size_t size, uint32_t flags)
67 : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
68 mDevice(0), mNeedUnmap(false)
70 int open_flags = O_RDWR;
71 if (flags & NO_CACHING)
74 int fd = open(device, open_flags);
75 LOGE_IF(fd<0, "error opening %s: %s", device, strerror(errno));
77 const size_t pagesize = getpagesize();
78 size = ((size + pagesize-1) & ~(pagesize-1));
79 if (mapfd(fd, size) == NO_ERROR) {
85 MemoryHeapBase::MemoryHeapBase(int fd, size_t size, uint32_t flags, uint32_t offset)
86 : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
87 mDevice(0), mNeedUnmap(false)
89 const size_t pagesize = getpagesize();
90 size = ((size + pagesize-1) & ~(pagesize-1));
91 mapfd(dup(fd), size, offset);
94 status_t MemoryHeapBase::init(int fd, void *base, int size, int flags, const char* device)
97 return INVALID_OPERATION;
107 status_t MemoryHeapBase::mapfd(int fd, size_t size, uint32_t offset)
110 // try to figure out the size automatically
112 // first try the PMEM ioctl
114 int err = ioctl(fd, PMEM_GET_TOTAL_SIZE, ®);
118 if (size == 0) { // try fstat
120 if (fstat(fd, &sb) == 0)
123 // if it didn't work, let mmap() fail.
126 if ((mFlags & DONT_MAP_LOCALLY) == 0) {
127 void* base = (uint8_t*)mmap(0, size,
128 PROT_READ|PROT_WRITE, MAP_SHARED, fd, offset);
129 if (base == MAP_FAILED) {
130 LOGE("mmap(fd=%d, size=%u) failed (%s)",
131 fd, uint32_t(size), strerror(errno));
135 //LOGD("mmap(fd=%d, base=%p, size=%lu)", fd, base, size);
139 mBase = 0; // not MAP_FAILED
147 MemoryHeapBase::~MemoryHeapBase()
152 void MemoryHeapBase::dispose()
154 int fd = android_atomic_or(-1, &mFD);
157 //LOGD("munmap(fd=%d, base=%p, size=%lu)", fd, mBase, mSize);
158 munmap(mBase, mSize);
166 int MemoryHeapBase::getHeapID() const {
170 void* MemoryHeapBase::getBase() const {
174 size_t MemoryHeapBase::getSize() const {
178 uint32_t MemoryHeapBase::getFlags() const {
182 const char* MemoryHeapBase::getDevice() const {
186 // ---------------------------------------------------------------------------
187 }; // namespace android