1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
// Copyright (C) 2003-2009 Dolphin Project.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
#include "Common.h"
#include "MemArena.h"
#ifdef _WIN32
#include <windows.h>
#else
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <cerrno>
#include <cstring>
#endif
#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
#define MAP_ANONYMOUS MAP_ANON
#endif
#ifndef _WIN32
static const char* ram_temp_file = "/tmp/gc_mem.tmp";
#endif
void MemArena::GrabLowMemSpace(size_t size)
{
#ifdef _WIN32
hMemoryMapping = CreateFileMapping(NULL, NULL, PAGE_READWRITE, 0, (DWORD)(size), _T("All GC Memory"));
#else
mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
fd = open(ram_temp_file, O_RDWR | O_CREAT, mode);
ftruncate(fd, size);
return;
#endif
}
void MemArena::ReleaseSpace()
{
#ifdef _WIN32
CloseHandle(hMemoryMapping);
hMemoryMapping = 0;
#else
close(fd);
unlink(ram_temp_file);
#endif
}
void* MemArena::CreateView(s64 offset, size_t size, bool ensure_low_mem)
{
#ifdef _WIN32
return MapViewOfFile(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size);
#else
void* ptr = mmap(0, size,
PROT_READ | PROT_WRITE,
MAP_SHARED
#ifdef __x86_64__
| (ensure_low_mem ? MAP_32BIT : 0)
#endif
, fd, offset);
if (!ptr)
{
PanicAlert("Failed to create view");
}
return(ptr);
#endif
}
void* MemArena::CreateViewAt(s64 offset, size_t size, void* base)
{
#ifdef _WIN32
return MapViewOfFileEx(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size, base);
#else
return mmap(base, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd, offset);
#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
void* base = mmap(0, 0x31000000, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, 0, 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
}
|
