mirror of
https://github.com/hrydgard/ppsspp.git
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123 lines
3.5 KiB
C++
123 lines
3.5 KiB
C++
// Copyright (C) 2003 Dolphin Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0 or later versions.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official SVN repository and contact information can be found at
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// http://code.google.com/p/dolphin-emu/
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#include "ppsspp_config.h"
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#if !defined(_WIN32) && !defined(ANDROID) && !defined(__APPLE__)
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#include <string>
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#include "FileUtil.h"
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#include "MemoryUtil.h"
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#include "MemArena.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <cerrno>
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#include <cstring>
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static const std::string tmpfs_location = "/dev/shm";
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static const std::string tmpfs_ram_temp_file = "/dev/shm/gc_mem.tmp";
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// do not make this "static"
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std::string ram_temp_file = "/tmp/gc_mem.tmp";
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size_t MemArena::roundup(size_t x) {
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return x;
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}
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bool MemArena::NeedsProbing() {
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return false;
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}
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void MemArena::GrabLowMemSpace(size_t size) {
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mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
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// Some platforms (like Raspberry Pi) end up flushing to disk.
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// To avoid this, we try to use /dev/shm (tmpfs) if it exists.
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fd = -1;
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if (File::Exists(tmpfs_location)) {
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fd = open(tmpfs_ram_temp_file.c_str(), O_RDWR | O_CREAT, mode);
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if (fd >= 0) {
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// Great, this definitely shouldn't flush to disk.
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ram_temp_file = tmpfs_ram_temp_file;
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}
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}
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if (fd < 0) {
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fd = open(ram_temp_file.c_str(), O_RDWR | O_CREAT, mode);
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}
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if (fd < 0) {
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ERROR_LOG(MEMMAP, "Failed to grab memory space as a file: %s of size: %08x errno: %d", ram_temp_file.c_str(), (int)size, (int)(errno));
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return;
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}
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// delete immediately, we keep the fd so it still lives
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if (unlink(ram_temp_file.c_str()) != 0) {
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WARN_LOG(MEMMAP, "Failed to unlink %s", ram_temp_file.c_str());
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}
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if (ftruncate(fd, size) != 0) {
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ERROR_LOG(MEMMAP, "Failed to ftruncate %d (%s) to size %08x", (int)fd, ram_temp_file.c_str(), (int)size);
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}
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return;
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}
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void MemArena::ReleaseSpace() {
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close(fd);
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}
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void *MemArena::CreateView(s64 offset, size_t size, void *base)
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{
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void *retval = mmap(base, size, PROT_READ | PROT_WRITE, MAP_SHARED |
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// Do not sync memory to underlying file. Linux has this by default.
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#if defined(__DragonFly__) || defined(__FreeBSD__)
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MAP_NOSYNC |
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#endif
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((base == 0) ? 0 : MAP_FIXED), fd, offset);
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if (retval == MAP_FAILED) {
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NOTICE_LOG(MEMMAP, "mmap on %s (fd: %d) failed", ram_temp_file.c_str(), (int)fd);
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return 0;
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}
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return retval;
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}
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void MemArena::ReleaseView(void* view, size_t size) {
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munmap(view, size);
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}
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u8* MemArena::Find4GBBase() {
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// Now, create views in high memory where there's plenty of space.
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#if PPSSPP_ARCH(64BIT) && !defined(USE_ADDRESS_SANITIZER)
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// Very precarious - mmap cannot return an error when trying to map already used pages.
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// This makes the Windows approach above unusable on Linux, so we will simply pray...
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return reinterpret_cast<u8*>(0x2300000000ULL);
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#else
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size_t size = 0x10000000;
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void* base = mmap(0, size, PROT_READ | PROT_WRITE,
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MAP_ANON | MAP_SHARED, -1, 0);
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if (base == MAP_FAILED) {
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PanicAlert("Failed to map 256 MB of memory space: %s", strerror(errno));
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return 0;
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}
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munmap(base, size);
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return static_cast<u8*>(base);
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#endif
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}
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#endif
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