mirror of
https://github.com/dolphin-emu/dolphin.git
synced 2025-10-25 01:19:19 +00:00
286 lines
7.2 KiB
C++
286 lines
7.2 KiB
C++
// Copyright (C) 2003 Dolphin Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official SVN repository and contact information can be found at
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// http://code.google.com/p/dolphin-emu/
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#include "Common.h"
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#include "MemoryUtil.h"
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#include "MemArena.h"
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <cerrno>
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#include <cstring>
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#endif
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#if defined(__APPLE__)
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static const char* ram_temp_file = "/tmp/gc_mem.tmp";
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#elif !defined(_WIN32) // non OSX unixes
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static const char* ram_temp_file = "/dev/shm/gc_mem.tmp";
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#endif
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void MemArena::GrabLowMemSpace(size_t size)
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{
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#ifdef _WIN32
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hMemoryMapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, (DWORD)(size), NULL);
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#else
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mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
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fd = open(ram_temp_file, O_RDWR | O_CREAT, mode);
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unlink(ram_temp_file);
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ftruncate(fd, size);
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return;
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#endif
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}
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void MemArena::ReleaseSpace()
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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 on %s failed", ram_temp_file);
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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::Find4GBBase()
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{
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#ifdef _M_X64
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#ifdef _WIN32
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// 64 bit
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u8* base = (u8*)VirtualAlloc(0, 0xE1000000, 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
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// 32 bit
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#ifdef _WIN32
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// The highest thing in any 1GB section of memory space is the locked cache. We only need to fit it.
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u8* base = (u8*)VirtualAlloc(0, 0x31000000, MEM_RESERVE, PAGE_READWRITE);
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if (base) {
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VirtualFree(base, 0, MEM_RELEASE);
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}
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return base;
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#else
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void* base = mmap(0, 0x31000000, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
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if (base == MAP_FAILED) {
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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, 0x31000000);
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return static_cast<u8*>(base);
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#endif
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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, const MemoryView *views, int num_views, u32 flags, MemArena *arena) {
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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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u32 position = 0;
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u32 last_position = 0;
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// Zero all the pointers to be sure.
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for (int i = 0; i < num_views; i++)
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{
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if (views[i].out_ptr_low)
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*views[i].out_ptr_low = 0;
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if (views[i].out_ptr)
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*views[i].out_ptr = 0;
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}
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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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SKIP(flags, views[i].flags);
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if (views[i].flags & MV_MIRROR_PREVIOUS) {
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position = last_position;
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} else {
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*(views[i].out_ptr_low) = (u8*)arena->CreateView(position, views[i].size);
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if (!*views[i].out_ptr_low)
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goto bail;
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}
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#ifdef _M_X64
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*views[i].out_ptr = (u8*)arena->CreateView(
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position, views[i].size, base + views[i].virtual_address);
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#else
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if (views[i].flags & MV_MIRROR_PREVIOUS) {
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// No need to create multiple identical views.
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*views[i].out_ptr = *views[i - 1].out_ptr;
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} else {
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*views[i].out_ptr = (u8*)arena->CreateView(
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position, views[i].size, base + (views[i].virtual_address & 0x3FFFFFFF));
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if (!*views[i].out_ptr)
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goto bail;
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}
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#endif
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last_position = position;
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position += views[i].size;
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}
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return true;
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bail:
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// Argh! ERROR! Free what we grabbed so far so we can try again.
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for (int j = 0; j <= i; j++)
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{
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SKIP(flags, views[i].flags);
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if (views[j].out_ptr_low && *views[j].out_ptr_low)
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{
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arena->ReleaseView(*views[j].out_ptr_low, views[j].size);
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*views[j].out_ptr_low = NULL;
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}
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if (*views[j].out_ptr)
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{
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#ifdef _M_X64
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arena->ReleaseView(*views[j].out_ptr, views[j].size);
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#else
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if (!(views[j].flags & MV_MIRROR_PREVIOUS))
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{
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arena->ReleaseView(*views[j].out_ptr, views[j].size);
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}
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#endif
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*views[j].out_ptr = NULL;
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}
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}
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return false;
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}
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u8 *MemoryMap_Setup(const MemoryView *views, int num_views, u32 flags, MemArena *arena)
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{
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u32 total_mem = 0;
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int base_attempts = 0;
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for (int i = 0; i < num_views; i++)
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{
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SKIP(flags, views[i].flags);
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if ((views[i].flags & MV_MIRROR_PREVIOUS) == 0)
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total_mem += views[i].size;
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}
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// Grab some pagefile backed memory out of the void ...
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arena->GrabLowMemSpace(total_mem);
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// Now, create views in high memory where there's plenty of space.
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#ifdef _M_X64
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u8 *base = MemArena::Find4GBBase();
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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 0;
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}
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#else
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#ifdef _WIN32
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// Try a whole range of possible bases. Return once we got a valid one.
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u32 max_base_addr = 0x7FFF0000 - 0x31000000;
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u8 *base = NULL;
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for (u32 base_addr = 0x40000; base_addr < max_base_addr; base_addr += 0x40000)
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{
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base_attempts++;
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base = (u8 *)base_addr;
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if (Memory_TryBase(base, views, num_views, flags, arena))
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{
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INFO_LOG(MEMMAP, "Found valid memory base at %p after %i tries.", base, base_attempts);
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base_attempts = 0;
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break;
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}
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}
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#else
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// Linux32 is fine with the x64 method, although limited to 32-bit with no automirrors.
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u8 *base = MemArena::Find4GBBase();
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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 0;
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}
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#endif
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#endif
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if (base_attempts)
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PanicAlert("No possible memory base pointer found!");
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return base;
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}
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void MemoryMap_Shutdown(const MemoryView *views, int num_views, u32 flags, MemArena *arena)
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{
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for (int i = 0; i < num_views; i++)
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{
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SKIP(flags, views[i].flags);
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if (views[i].out_ptr_low && *views[i].out_ptr_low)
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arena->ReleaseView(*views[i].out_ptr_low, views[i].size);
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if (*views[i].out_ptr && (views[i].out_ptr_low && *views[i].out_ptr != *views[i].out_ptr_low))
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arena->ReleaseView(*views[i].out_ptr, views[i].size);
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*views[i].out_ptr = NULL;
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if (views[i].out_ptr_low)
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*views[i].out_ptr_low = NULL;
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}
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}
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