305 lines
7.2 KiB
C++
305 lines
7.2 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
|
|
#include <set>
|
|
|
|
#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
|
|
// Android 4.3 changed how mmap works.
|
|
// if we map it private and then munmap it, we can't use the base returned.
|
|
// This may be due to changes in them support a full SELinux implementation.
|
|
const int flags = MAP_ANON;
|
|
#else
|
|
const int flags = MAP_ANON | MAP_PRIVATE;
|
|
#endif
|
|
const u32 MemSize = 0x31000000;
|
|
void* base = mmap(0, MemSize, PROT_NONE, flags, -1, 0);
|
|
if (base == MAP_FAILED) {
|
|
PanicAlert("Failed to map 1 GB of memory space: %s", strerror(errno));
|
|
return 0;
|
|
}
|
|
munmap(base, MemSize);
|
|
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.
|
|
MemoryMap_Shutdown(views, i+1, flags, arena);
|
|
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)
|
|
{
|
|
std::set<void*> freeset;
|
|
for (int i = 0; i < num_views; i++)
|
|
{
|
|
const MemoryView* view = &views[i];
|
|
u8** outptrs[2] = {view->out_ptr_low, view->out_ptr};
|
|
for (int j = 0; j < 2; j++)
|
|
{
|
|
u8** outptr = outptrs[j];
|
|
if (outptr && *outptr && !freeset.count(*outptr))
|
|
{
|
|
arena->ReleaseView(*outptr, view->size);
|
|
freeset.insert(*outptr);
|
|
*outptr = NULL;
|
|
}
|
|
}
|
|
}
|
|
}
|