forked from dolphin-emu/dolphin
280 lines
6.3 KiB
C++
280 lines
6.3 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/CommonTypes.h"
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#include "Common/MemArena.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 <unistd.h>
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#include <sys/mman.h>
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#ifdef ANDROID
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#include <sys/ioctl.h>
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#include <linux/ashmem.h>
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#endif
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#endif
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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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hMemoryMapping = CreateFileMapping(INVALID_HANDLE_VALUE, nullptr, PAGE_READWRITE, 0, (DWORD)(size), nullptr);
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#elif defined(ANDROID)
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fd = AshmemCreateFileMapping("Dolphin-emu", 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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for (int i = 0; i < 10000; i++)
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{
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std::string file_name = StringFromFormat("/dolphinmem.%d", i);
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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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shm_unlink(file_name.c_str());
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break;
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}
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else if (errno != EEXIST)
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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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}
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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(
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base, size,
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PROT_READ | PROT_WRITE,
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MAP_SHARED | ((base == nullptr) ? 0 : MAP_FIXED),
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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_64
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#ifdef _WIN32
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// 64 bit
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u8* base = (u8*)VirtualAlloc(0, 0x400000000, MEM_RESERVE, PAGE_READWRITE);
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VirtualFree(base, 0, MEM_RELEASE);
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return base;
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#else
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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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#endif
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#else // 32 bit
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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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const u32 MemSize = 0x31000000;
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void* base = mmap(0, MemSize, 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 1 GB of memory space: %s", strerror(errno));
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return 0;
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}
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munmap(base, MemSize);
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return static_cast<u8*>(base);
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#endif
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}
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// yeah, this could also be done in like two bitwise ops...
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#define SKIP(a_flags, b_flags) \
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if (!(a_flags & MV_WII_ONLY) && (b_flags & MV_WII_ONLY)) \
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continue; \
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if (!(a_flags & MV_FAKE_VMEM) && (b_flags & MV_FAKE_VMEM)) \
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continue; \
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static bool Memory_TryBase(u8 *base, MemoryView *views, int num_views, u32 flags, MemArena *arena)
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{
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// OK, we know where to find free space. Now grab it!
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// We just mimic the popular BAT setup.
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int i;
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for (i = 0; i < num_views; i++)
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{
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MemoryView* view = &views[i];
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void* view_base;
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bool use_sw_mirror;
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SKIP(flags, view->flags);
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#if _ARCH_64
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// On 64-bit, we map the same file position multiple times, so we
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// don't need the software fallback for the mirrors.
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view_base = base + view->virtual_address;
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use_sw_mirror = false;
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#else
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// On 32-bit, we don't have the actual address space to store all
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// the mirrors, so we just map the fallbacks somewhere in our address
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// space and use the software fallbacks for mirroring.
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view_base = base + (view->virtual_address & 0x3FFFFFFF);
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use_sw_mirror = true;
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#endif
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if (use_sw_mirror && (view->flags & MV_MIRROR_PREVIOUS))
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{
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view->view_ptr = views[i - 1].view_ptr;
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}
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else
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{
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view->mapped_ptr = arena->CreateView(view->shm_position, view->size, view_base);
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view->view_ptr = view->mapped_ptr;
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}
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if (!view->view_ptr)
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{
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// Argh! ERROR! Free what we grabbed so far so we can try again.
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MemoryMap_Shutdown(views, i+1, flags, arena);
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return false;
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}
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if (view->out_ptr)
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*(view->out_ptr) = (u8*) view->view_ptr;
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}
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return true;
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}
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static u32 MemoryMap_InitializeViews(MemoryView *views, int num_views, u32 flags)
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{
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u32 shm_position = 0;
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u32 last_position = 0;
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for (int i = 0; i < num_views; i++)
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{
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// Zero all the pointers to be sure.
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views[i].mapped_ptr = nullptr;
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SKIP(flags, views[i].flags);
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if (views[i].flags & MV_MIRROR_PREVIOUS)
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shm_position = last_position;
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views[i].shm_position = shm_position;
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last_position = shm_position;
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shm_position += views[i].size;
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}
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return shm_position;
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}
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u8 *MemoryMap_Setup(MemoryView *views, int num_views, u32 flags, MemArena *arena)
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{
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u32 total_mem = MemoryMap_InitializeViews(views, num_views, flags);
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arena->GrabSHMSegment(total_mem);
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// Now, create views in high memory where there's plenty of space.
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u8 *base = MemArena::FindMemoryBase();
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// This really shouldn't fail - in 64-bit, there will always be enough
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// address space.
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if (!Memory_TryBase(base, views, num_views, flags, arena))
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{
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PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
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exit(0);
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return nullptr;
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}
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return base;
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}
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void MemoryMap_Shutdown(MemoryView *views, int num_views, u32 flags, MemArena *arena)
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{
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std::set<void*> freeset;
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for (int i = 0; i < num_views; i++)
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{
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MemoryView* view = &views[i];
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if (view->mapped_ptr && !freeset.count(view->mapped_ptr))
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{
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arena->ReleaseView(view->mapped_ptr, view->size);
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freeset.insert(view->mapped_ptr);
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view->mapped_ptr = nullptr;
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}
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}
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}
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