145 lines
3.3 KiB
C++
145 lines
3.3 KiB
C++
// Copyright (C) 2003-2008 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 "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/mman.h>
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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(MAP_ANONYMOUS) && defined(MAP_ANON)
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#define MAP_ANONYMOUS MAP_ANON
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#endif
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const char* ram_temp_file = "/tmp/gc_mem.tmp";
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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(NULL, NULL, PAGE_READWRITE, 0, (DWORD)(size), _T("All GC Memory"));
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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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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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unlink(ram_temp_file);
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#endif
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}
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void* MemArena::CreateView(s64 offset, size_t size, bool ensure_low_mem)
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{
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#ifdef _WIN32
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return(MapViewOfFile(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size));
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#else
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void* ptr = mmap(0, size,
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PROT_READ | PROT_WRITE,
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MAP_SHARED
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#ifdef __x86_64__
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| (ensure_low_mem ? MAP_32BIT : 0)
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#endif
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, fd, offset);
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if (!ptr)
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{
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PanicAlert("Failed to create view");
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}
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return(ptr);
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#endif
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}
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void* MemArena::CreateViewAt(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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return(mmap(base, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd, offset));
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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_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, 0, 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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