188 lines
4.8 KiB
C++
188 lines
4.8 KiB
C++
/*
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* Copyright (C) 2008 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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*/
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#define LOG_TAG "MemoryHeapBase"
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <cutils/log.h>
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#include <cutils/ashmem.h>
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#include <cutils/atomic.h>
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#include <binder/MemoryHeapBase.h>
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#if HAVE_ANDROID_OS
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#include <linux/android_pmem.h>
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#endif
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namespace android {
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// ---------------------------------------------------------------------------
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MemoryHeapBase::MemoryHeapBase()
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: mFD(-1), mSize(0), mBase(MAP_FAILED),
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mDevice(NULL), mNeedUnmap(false)
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{
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}
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MemoryHeapBase::MemoryHeapBase(size_t size, uint32_t flags, char const * name)
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: mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
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mDevice(0), mNeedUnmap(false)
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{
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const size_t pagesize = getpagesize();
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size = ((size + pagesize-1) & ~(pagesize-1));
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int fd = ashmem_create_region(name == NULL ? "MemoryHeapBase" : name, size);
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LOGE_IF(fd<0, "error creating ashmem region: %s", strerror(errno));
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if (fd >= 0) {
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if (mapfd(fd, size) == NO_ERROR) {
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if (flags & READ_ONLY) {
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ashmem_set_prot_region(fd, PROT_READ);
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}
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}
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}
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}
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MemoryHeapBase::MemoryHeapBase(const char* device, size_t size, uint32_t flags)
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: mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
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mDevice(0), mNeedUnmap(false)
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{
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int open_flags = O_RDWR;
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if (flags & NO_CACHING)
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open_flags |= O_SYNC;
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int fd = open(device, open_flags);
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LOGE_IF(fd<0, "error opening %s: %s", device, strerror(errno));
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if (fd >= 0) {
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const size_t pagesize = getpagesize();
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size = ((size + pagesize-1) & ~(pagesize-1));
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if (mapfd(fd, size) == NO_ERROR) {
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mDevice = device;
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}
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}
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}
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MemoryHeapBase::MemoryHeapBase(int fd, size_t size, uint32_t flags, uint32_t offset)
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: mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
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mDevice(0), mNeedUnmap(false)
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{
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const size_t pagesize = getpagesize();
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size = ((size + pagesize-1) & ~(pagesize-1));
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mapfd(dup(fd), size, offset);
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}
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status_t MemoryHeapBase::init(int fd, void *base, int size, int flags, const char* device)
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{
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if (mFD != -1) {
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return INVALID_OPERATION;
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}
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mFD = fd;
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mBase = base;
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mSize = size;
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mFlags = flags;
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mDevice = device;
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return NO_ERROR;
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}
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status_t MemoryHeapBase::mapfd(int fd, size_t size, uint32_t offset)
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{
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if (size == 0) {
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// try to figure out the size automatically
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#if HAVE_ANDROID_OS
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// first try the PMEM ioctl
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pmem_region reg;
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int err = ioctl(fd, PMEM_GET_TOTAL_SIZE, ®);
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if (err == 0)
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size = reg.len;
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#endif
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if (size == 0) { // try fstat
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struct stat sb;
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if (fstat(fd, &sb) == 0)
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size = sb.st_size;
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}
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// if it didn't work, let mmap() fail.
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}
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if ((mFlags & DONT_MAP_LOCALLY) == 0) {
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void* base = (uint8_t*)mmap(0, size,
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PROT_READ|PROT_WRITE, MAP_SHARED, fd, offset);
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if (base == MAP_FAILED) {
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LOGE("mmap(fd=%d, size=%u) failed (%s)",
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fd, uint32_t(size), strerror(errno));
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close(fd);
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return -errno;
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}
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//LOGD("mmap(fd=%d, base=%p, size=%lu)", fd, base, size);
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mBase = base;
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mNeedUnmap = true;
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} else {
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mBase = 0; // not MAP_FAILED
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mNeedUnmap = false;
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}
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mFD = fd;
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mSize = size;
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return NO_ERROR;
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}
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MemoryHeapBase::~MemoryHeapBase()
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{
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dispose();
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}
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void MemoryHeapBase::dispose()
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{
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int fd = android_atomic_or(-1, &mFD);
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if (fd >= 0) {
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if (mNeedUnmap) {
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//LOGD("munmap(fd=%d, base=%p, size=%lu)", fd, mBase, mSize);
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munmap(mBase, mSize);
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}
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mBase = 0;
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mSize = 0;
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close(fd);
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}
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}
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int MemoryHeapBase::getHeapID() const {
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return mFD;
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}
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void* MemoryHeapBase::getBase() const {
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return mBase;
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}
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size_t MemoryHeapBase::getSize() const {
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return mSize;
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}
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uint32_t MemoryHeapBase::getFlags() const {
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return mFlags;
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}
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const char* MemoryHeapBase::getDevice() const {
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return mDevice;
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}
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// ---------------------------------------------------------------------------
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}; // namespace android
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