dolphin/Source/Core/Common/Src/MemArena.cpp

315 lines
7.5 KiB
C++

// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#include "Common.h"
#include "MemoryUtil.h"
#include "MemArena.h"
#ifdef _WIN32
#include <windows.h>
#else
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <cerrno>
#include <cstring>
#ifdef ANDROID
#include <sys/ioctl.h>
#include <linux/ashmem.h>
#endif
#endif
#if defined(__APPLE__)
static const char* ram_temp_file = "/tmp/gc_mem.tmp";
#elif !defined(_WIN32) // non OSX unixes
static const char* ram_temp_file = "/dev/shm/gc_mem.tmp";
#endif
#ifdef ANDROID
#define ASHMEM_DEVICE "/dev/ashmem"
int AshmemCreateFileMapping(const char *name, size_t size)
{
int fd, ret;
fd = open(ASHMEM_DEVICE, O_RDWR);
if (fd < 0)
return fd;
// We don't really care if we can't set the name, it is optional
ret = ioctl(fd, ASHMEM_SET_NAME, name);
ret = ioctl(fd, ASHMEM_SET_SIZE, size);
if (ret < 0)
{
close(fd);
NOTICE_LOG(MEMMAP, "Ashmem returned error: 0x%08x", ret);
return ret;
}
return fd;
}
#endif
void MemArena::GrabLowMemSpace(size_t size)
{
#ifdef _WIN32
hMemoryMapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, (DWORD)(size), NULL);
#elif defined(ANDROID)
fd = AshmemCreateFileMapping("Dolphin-emu", size);
if (fd < 0)
{
NOTICE_LOG(MEMMAP, "Ashmem allocation failed");
return;
}
#else
mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
fd = open(ram_temp_file, O_RDWR | O_CREAT, mode);
unlink(ram_temp_file);
if (ftruncate(fd, size) < 0)
ERROR_LOG(MEMMAP, "Failed to allocate low memory space");
return;
#endif
}
void MemArena::ReleaseSpace()
{
#ifdef _WIN32
CloseHandle(hMemoryMapping);
hMemoryMapping = 0;
#else
close(fd);
#endif
}
void *MemArena::CreateView(s64 offset, size_t size, void *base)
{
#ifdef _WIN32
return MapViewOfFileEx(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size, base);
#else
void *retval = mmap(
base, size,
PROT_READ | PROT_WRITE,
MAP_SHARED | ((base == nullptr) ? 0 : MAP_FIXED),
fd, offset);
if (retval == MAP_FAILED)
{
NOTICE_LOG(MEMMAP, "mmap on %s failed", ram_temp_file);
return nullptr;
}
else
{
return retval;
}
#endif
}
void MemArena::ReleaseView(void* view, size_t size)
{
#ifdef _WIN32
UnmapViewOfFile(view);
#else
munmap(view, size);
#endif
}
u8* MemArena::Find4GBBase()
{
#ifdef _M_X64
#ifdef _WIN32
// 64 bit
u8* base = (u8*)VirtualAlloc(0, 0xE1000000, MEM_RESERVE, PAGE_READWRITE);
VirtualFree(base, 0, MEM_RELEASE);
return base;
#else
// Very precarious - mmap cannot return an error when trying to map already used pages.
// This makes the Windows approach above unusable on Linux, so we will simply pray...
return reinterpret_cast<u8*>(0x2300000000ULL);
#endif
#else
// 32 bit
#ifdef _WIN32
// The highest thing in any 1GB section of memory space is the locked cache. We only need to fit it.
u8* base = (u8*)VirtualAlloc(0, 0x31000000, MEM_RESERVE, PAGE_READWRITE);
if (base) {
VirtualFree(base, 0, MEM_RELEASE);
}
return base;
#else
#ifdef ANDROID
const u32 MemSize = 0x04000000;
#else
const u32 MemSize = 0x31000000;
#endif
void* base = mmap(0, MemSize, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
if (base == MAP_FAILED) {
PanicAlert("Failed to map 1 GB of memory space: %s", strerror(errno));
return 0;
}
munmap(base, 0x31000000);
return static_cast<u8*>(base);
#endif
#endif
}
// yeah, this could also be done in like two bitwise ops...
#define SKIP(a_flags, b_flags) \
if (!(a_flags & MV_WII_ONLY) && (b_flags & MV_WII_ONLY)) \
continue; \
if (!(a_flags & MV_FAKE_VMEM) && (b_flags & MV_FAKE_VMEM)) \
continue; \
static bool Memory_TryBase(u8 *base, const MemoryView *views, int num_views, u32 flags, MemArena *arena) {
// OK, we know where to find free space. Now grab it!
// We just mimic the popular BAT setup.
u32 position = 0;
u32 last_position = 0;
// Zero all the pointers to be sure.
for (int i = 0; i < num_views; i++)
{
if (views[i].out_ptr_low)
*views[i].out_ptr_low = 0;
if (views[i].out_ptr)
*views[i].out_ptr = 0;
}
int i;
for (i = 0; i < num_views; i++)
{
SKIP(flags, views[i].flags);
if (views[i].flags & MV_MIRROR_PREVIOUS) {
position = last_position;
} else {
*(views[i].out_ptr_low) = (u8*)arena->CreateView(position, views[i].size);
if (!*views[i].out_ptr_low)
goto bail;
}
#ifdef _M_X64
*views[i].out_ptr = (u8*)arena->CreateView(
position, views[i].size, base + views[i].virtual_address);
#else
if (views[i].flags & MV_MIRROR_PREVIOUS) {
// No need to create multiple identical views.
*views[i].out_ptr = *views[i - 1].out_ptr;
} else {
*views[i].out_ptr = (u8*)arena->CreateView(
position, views[i].size, base + (views[i].virtual_address & 0x3FFFFFFF));
if (!*views[i].out_ptr)
goto bail;
}
#endif
last_position = position;
position += views[i].size;
}
return true;
bail:
// Argh! ERROR! Free what we grabbed so far so we can try again.
for (int j = 0; j <= i; j++)
{
SKIP(flags, views[i].flags);
if (views[j].out_ptr_low && *views[j].out_ptr_low)
{
arena->ReleaseView(*views[j].out_ptr_low, views[j].size);
*views[j].out_ptr_low = NULL;
}
if (*views[j].out_ptr)
{
#ifdef _M_X64
arena->ReleaseView(*views[j].out_ptr, views[j].size);
#else
if (!(views[j].flags & MV_MIRROR_PREVIOUS))
{
arena->ReleaseView(*views[j].out_ptr, views[j].size);
}
#endif
*views[j].out_ptr = NULL;
}
}
return false;
}
u8 *MemoryMap_Setup(const MemoryView *views, int num_views, u32 flags, MemArena *arena)
{
u32 total_mem = 0;
int base_attempts = 0;
for (int i = 0; i < num_views; i++)
{
SKIP(flags, views[i].flags);
if ((views[i].flags & MV_MIRROR_PREVIOUS) == 0)
total_mem += views[i].size;
}
// Grab some pagefile backed memory out of the void ...
arena->GrabLowMemSpace(total_mem);
// Now, create views in high memory where there's plenty of space.
#ifdef _M_X64
u8 *base = MemArena::Find4GBBase();
// This really shouldn't fail - in 64-bit, there will always be enough
// address space.
if (!Memory_TryBase(base, views, num_views, flags, arena))
{
PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
exit(0);
return 0;
}
#else
#ifdef _WIN32
// Try a whole range of possible bases. Return once we got a valid one.
u32 max_base_addr = 0x7FFF0000 - 0x31000000;
u8 *base = NULL;
for (u32 base_addr = 0x40000; base_addr < max_base_addr; base_addr += 0x40000)
{
base_attempts++;
base = (u8 *)base_addr;
if (Memory_TryBase(base, views, num_views, flags, arena))
{
INFO_LOG(MEMMAP, "Found valid memory base at %p after %i tries.", base, base_attempts);
base_attempts = 0;
break;
}
}
#else
// Linux32 is fine with the x64 method, although limited to 32-bit with no automirrors.
u8 *base = MemArena::Find4GBBase();
if (!Memory_TryBase(base, views, num_views, flags, arena))
{
PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
exit(0);
return 0;
}
#endif
#endif
if (base_attempts)
PanicAlert("No possible memory base pointer found!");
return base;
}
void MemoryMap_Shutdown(const MemoryView *views, int num_views, u32 flags, MemArena *arena)
{
for (int i = 0; i < num_views; i++)
{
SKIP(flags, views[i].flags);
if (views[i].out_ptr_low && *views[i].out_ptr_low)
arena->ReleaseView(*views[i].out_ptr_low, views[i].size);
if (*views[i].out_ptr && (views[i].out_ptr_low && *views[i].out_ptr != *views[i].out_ptr_low))
arena->ReleaseView(*views[i].out_ptr, views[i].size);
*views[i].out_ptr = NULL;
if (views[i].out_ptr_low)
*views[i].out_ptr_low = NULL;
}
}