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110 lines
2.5 KiB
C++
110 lines
2.5 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "Common/MemArena.h"
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#include <cerrno>
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#include <cstddef>
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#include <cstdlib>
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#include <cstring>
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#include <set>
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#include <string>
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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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#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/MsgHandler.h"
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#include "Common/StringUtil.h"
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namespace Common
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{
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MemArena::MemArena() = default;
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MemArena::~MemArena() = default;
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void MemArena::GrabSHMSegment(size_t size)
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{
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const std::string file_name = "/dolphin-emu." + std::to_string(getpid());
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m_shm_fd = shm_open(file_name.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
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if (m_shm_fd == -1)
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{
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ERROR_LOG_FMT(MEMMAP, "shm_open failed: {}", 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(m_shm_fd, size) < 0)
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ERROR_LOG_FMT(MEMMAP, "Failed to allocate low memory space");
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}
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void MemArena::ReleaseSHMSegment()
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{
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close(m_shm_fd);
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}
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void* MemArena::CreateView(s64 offset, size_t size)
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{
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void* retval = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, m_shm_fd, offset);
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if (retval == MAP_FAILED)
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{
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NOTICE_LOG_FMT(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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}
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void MemArena::ReleaseView(void* view, size_t size)
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{
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munmap(view, size);
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}
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u8* MemArena::ReserveMemoryRegion(size_t memory_size)
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{
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const int flags = MAP_ANON | MAP_PRIVATE;
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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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PanicAlertFmt("Failed to map enough memory space: {}", LastStrerrorString());
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return nullptr;
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}
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m_reserved_region = base;
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m_reserved_region_size = memory_size;
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return static_cast<u8*>(base);
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}
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void MemArena::ReleaseMemoryRegion()
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{
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if (m_reserved_region)
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{
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munmap(m_reserved_region, m_reserved_region_size);
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m_reserved_region = nullptr;
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}
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}
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void* MemArena::MapInMemoryRegion(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 | MAP_FIXED, m_shm_fd, offset);
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if (retval == MAP_FAILED)
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{
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NOTICE_LOG_FMT(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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}
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void MemArena::UnmapFromMemoryRegion(void* view, size_t size)
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{
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void* retval = mmap(view, size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
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if (retval == MAP_FAILED)
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NOTICE_LOG_FMT(MEMMAP, "mmap failed");
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}
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} // namespace Common
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