mirror of
https://github.com/dolphin-emu/dolphin.git
synced 2024-09-21 11:51:48 +02:00
d557310371
Fundamentally, all this does is enforce the invariant that we always translate effective addresses based on the current BAT registers and page table before we do anything else with them. This change can be logically divided into three parts. The first part is creating a table to represent the current BAT state, and keeping it up to date (PowerPC::IBATUpdated, PowerPC::DBATUpdated, etc.). This does nothing by itself, but it's necessary for the other parts. The second part (mostly in MMU.cpp) is simply removing all the hardcoded checks for specific untranslated addresses, and consistently translating addresses using the current BAT configuration. Very straightforward, but a lot of code changes because we hardcoded assumptions all over the place. The third part (mostly in Memmap.cpp) is making the fastmem arena reflect the current BAT configuration. We do this by redoing the mapping (calling memmap()) based on the BAT table whenever it changes. One additional minor change is that translation can fail in two ways: either the segment is a direct store segment, or page table lookup failed. The difference doesn't usually matter, but the difference affects cache instructions, like dcbz.
159 lines
3.6 KiB
C++
159 lines
3.6 KiB
C++
// Copyright 2008 Dolphin Emulator Project
|
|
// Licensed under GPLv2+
|
|
// Refer to the license.txt file included.
|
|
|
|
#include <cstddef>
|
|
#include <cstdlib>
|
|
#include <set>
|
|
#include <string>
|
|
|
|
#include "Common/CommonTypes.h"
|
|
#include "Common/Logging/Log.h"
|
|
#include "Common/MemArena.h"
|
|
#include "Common/MsgHandler.h"
|
|
#include "Common/StringUtil.h"
|
|
|
|
#ifdef _WIN32
|
|
#include <windows.h>
|
|
#else
|
|
#include <cerrno>
|
|
#include <cstring>
|
|
#include <fcntl.h>
|
|
#include <sys/mman.h>
|
|
#include <unistd.h>
|
|
#ifdef ANDROID
|
|
#include <linux/ashmem.h>
|
|
#include <sys/ioctl.h>
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef ANDROID
|
|
#define ASHMEM_DEVICE "/dev/ashmem"
|
|
|
|
static 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
|
|
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::GrabSHMSegment(size_t size)
|
|
{
|
|
#ifdef _WIN32
|
|
hMemoryMapping =
|
|
CreateFileMapping(INVALID_HANDLE_VALUE, nullptr, PAGE_READWRITE, 0, (DWORD)(size), nullptr);
|
|
#elif defined(ANDROID)
|
|
fd = AshmemCreateFileMapping("Dolphin-emu", size);
|
|
if (fd < 0)
|
|
{
|
|
NOTICE_LOG(MEMMAP, "Ashmem allocation failed");
|
|
return;
|
|
}
|
|
#else
|
|
for (int i = 0; i < 10000; i++)
|
|
{
|
|
std::string file_name = StringFromFormat("/dolphinmem.%d", i);
|
|
fd = shm_open(file_name.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
|
|
if (fd != -1)
|
|
{
|
|
shm_unlink(file_name.c_str());
|
|
break;
|
|
}
|
|
else if (errno != EEXIST)
|
|
{
|
|
ERROR_LOG(MEMMAP, "shm_open failed: %s", strerror(errno));
|
|
return;
|
|
}
|
|
}
|
|
if (ftruncate(fd, size) < 0)
|
|
ERROR_LOG(MEMMAP, "Failed to allocate low memory space");
|
|
#endif
|
|
}
|
|
|
|
void MemArena::ReleaseSHMSegment()
|
|
{
|
|
#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 failed");
|
|
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::FindMemoryBase()
|
|
{
|
|
#if _ARCH_64
|
|
#ifdef _WIN32
|
|
// 64 bit
|
|
u8* base = (u8*)VirtualAlloc(0, 0x400000000, 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 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 | MAP_SHARED;
|
|
#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
|
|
}
|