mirror of
https://github.com/dolphin-emu/dolphin.git
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160 lines
3.7 KiB
C++
160 lines
3.7 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#include <cstddef>
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#include <cstdlib>
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#include <set>
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#include <string>
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#include "Common/CommonFuncs.h"
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#include "Common/CommonTypes.h"
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#include "Common/Logging/Log.h"
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#include "Common/MemArena.h"
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#include "Common/MsgHandler.h"
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#include "Common/StringUtil.h"
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <cerrno>
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#include <cstring>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#ifdef ANDROID
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#include <linux/ashmem.h>
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#include <sys/ioctl.h>
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#endif
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#endif
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namespace Common
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{
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#ifdef ANDROID
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#define ASHMEM_DEVICE "/dev/ashmem"
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static int AshmemCreateFileMapping(const char* name, size_t size)
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{
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int fd, ret;
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fd = open(ASHMEM_DEVICE, O_RDWR);
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if (fd < 0)
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return fd;
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// We don't really care if we can't set the name, it is optional
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ioctl(fd, ASHMEM_SET_NAME, name);
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ret = ioctl(fd, ASHMEM_SET_SIZE, size);
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if (ret < 0)
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{
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close(fd);
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NOTICE_LOG(MEMMAP, "Ashmem returned error: 0x%08x", ret);
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return ret;
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}
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return fd;
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}
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#endif
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void MemArena::GrabSHMSegment(size_t size)
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{
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#ifdef _WIN32
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const std::string name = "dolphin-emu." + std::to_string(GetCurrentProcessId());
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hMemoryMapping = CreateFileMapping(INVALID_HANDLE_VALUE, nullptr, PAGE_READWRITE, 0,
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static_cast<DWORD>(size), UTF8ToTStr(name).c_str());
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#elif defined(ANDROID)
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fd = AshmemCreateFileMapping(("dolphin-emu." + std::to_string(getpid())).c_str(), size);
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if (fd < 0)
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{
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NOTICE_LOG(MEMMAP, "Ashmem allocation failed");
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return;
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}
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#else
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const std::string file_name = "/dolphin-emu." + std::to_string(getpid());
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fd = shm_open(file_name.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
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if (fd == -1)
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{
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ERROR_LOG(MEMMAP, "shm_open failed: %s", strerror(errno));
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return;
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}
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shm_unlink(file_name.c_str());
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if (ftruncate(fd, size) < 0)
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ERROR_LOG(MEMMAP, "Failed to allocate low memory space");
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#endif
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}
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void MemArena::ReleaseSHMSegment()
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{
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#ifdef _WIN32
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CloseHandle(hMemoryMapping);
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hMemoryMapping = 0;
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#else
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close(fd);
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#endif
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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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#ifdef _WIN32
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return MapViewOfFileEx(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size, base);
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#else
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void* retval = mmap(base, size, PROT_READ | PROT_WRITE,
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MAP_SHARED | ((base == nullptr) ? 0 : MAP_FIXED), fd, offset);
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if (retval == MAP_FAILED)
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{
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NOTICE_LOG(MEMMAP, "mmap failed");
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return nullptr;
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}
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else
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{
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return retval;
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}
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#endif
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}
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void MemArena::ReleaseView(void* view, size_t size)
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{
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#ifdef _WIN32
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UnmapViewOfFile(view);
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#else
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munmap(view, size);
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#endif
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}
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u8* MemArena::FindMemoryBase()
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{
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#if _ARCH_32
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const size_t memory_size = 0x31000000;
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#else
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const size_t memory_size = 0x400000000;
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#endif
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#ifdef _WIN32
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u8* base = static_cast<u8*>(VirtualAlloc(nullptr, memory_size, MEM_RESERVE, PAGE_READWRITE));
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if (!base)
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{
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PanicAlert("Failed to map enough memory space: %s", GetLastErrorString().c_str());
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return nullptr;
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}
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VirtualFree(base, 0, MEM_RELEASE);
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return base;
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#else
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#ifdef ANDROID
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// Android 4.3 changed how mmap works.
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// if we map it private and then munmap it, we can't use the base returned.
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// This may be due to changes in them support a full SELinux implementation.
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const int flags = MAP_ANON | MAP_SHARED;
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#else
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const int flags = MAP_ANON | MAP_PRIVATE;
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#endif
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void* base = mmap(nullptr, memory_size, PROT_NONE, flags, -1, 0);
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if (base == MAP_FAILED)
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{
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PanicAlert("Failed to map enough memory space: %s", LastStrerrorString().c_str());
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return nullptr;
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}
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munmap(base, memory_size);
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return static_cast<u8*>(base);
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#endif
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}
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} // namespace Common
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