84 lines
1.8 KiB
C++
84 lines
1.8 KiB
C++
|
// Copyright 2008 Dolphin Emulator Project
|
||
|
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
|
||
|
|
#include "Common/MemArena.h"
|
||
|
|
|
||
|
|
#include <cerrno>
|
||
|
|
#include <cstddef>
|
||
|
|
#include <cstdlib>
|
||
|
|
#include <cstring>
|
||
|
|
#include <set>
|
||
|
|
#include <string>
|
||
|
|
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <sys/mman.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
#include "Common/CommonFuncs.h"
|
||
|
|
#include "Common/CommonTypes.h"
|
||
|
|
#include "Common/Logging/Log.h"
|
||
|
|
#include "Common/MsgHandler.h"
|
||
|
|
#include "Common/StringUtil.h"
|
||
|
|
|
||
|
|
namespace Common
|
||
|
|
{
|
||
|
|
void MemArena::GrabSHMSegment(size_t size)
|
||
|
|
{
|
||
|
|
const std::string file_name = "/dolphin-emu." + std::to_string(getpid());
|
||
|
|
fd = shm_open(file_name.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
|
||
|
|
if (fd == -1)
|
||
|
|
{
|
||
|
|
ERROR_LOG_FMT(MEMMAP, "shm_open failed: {}", strerror(errno));
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
shm_unlink(file_name.c_str());
|
||
|
|
if (ftruncate(fd, size) < 0)
|
||
|
|
ERROR_LOG_FMT(MEMMAP, "Failed to allocate low memory space");
|
||
|
|
}
|
||
|
|
|
||
|
|
void MemArena::ReleaseSHMSegment()
|
||
|
|
{
|
||
|
|
close(fd);
|
||
|
|
}
|
||
|
|
|
||
|
|
void* MemArena::CreateView(s64 offset, size_t size, void* base)
|
||
|
|
{
|
||
|
|
void* retval = mmap(base, size, PROT_READ | PROT_WRITE,
|
||
|
|
MAP_SHARED | ((base == nullptr) ? 0 : MAP_FIXED), fd, offset);
|
||
|
|
|
||
|
|
if (retval == MAP_FAILED)
|
||
|
|
{
|
||
|
|
NOTICE_LOG_FMT(MEMMAP, "mmap failed");
|
||
|
|
return nullptr;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void MemArena::ReleaseView(void* view, size_t size)
|
||
|
|
{
|
||
|
|
munmap(view, size);
|
||
|
|
}
|
||
|
|
|
||
|
|
u8* MemArena::FindMemoryBase()
|
||
|
|
{
|
||
|
|
#if _ARCH_32
|
||
|
|
const size_t memory_size = 0x31000000;
|
||
|
|
#else
|
||
|
|
const size_t memory_size = 0x400000000;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
const int flags = MAP_ANON | MAP_PRIVATE;
|
||
|
|
void* base = mmap(nullptr, memory_size, PROT_NONE, flags, -1, 0);
|
||
|
|
if (base == MAP_FAILED)
|
||
|
|
{
|
||
|
|
PanicAlertFmt("Failed to map enough memory space: {}", LastStrerrorString());
|
||
|
|
return nullptr;
|
||
|
|
}
|
||
|
|
munmap(base, memory_size);
|
||
|
|
return static_cast<u8*>(base);
|
||
|
|
}
|
||
|
|
} // namespace Common
|