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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
|
using Ryujinx.Common;
using System;
namespace Ryujinx.HLE.HOS.Kernel.Memory
{
class KPageHeap
{
private class Block
{
private KPageBitmap _bitmap = new KPageBitmap();
private ulong _heapAddress;
private ulong _endOffset;
public int Shift { get; private set; }
public int NextShift { get; private set; }
public ulong Size => 1UL << Shift;
public int PagesCount => (int)(Size / KPageTableBase.PageSize);
public int FreeBlocksCount => _bitmap.BitsCount;
public int FreePagesCount => FreeBlocksCount * PagesCount;
public ArraySegment<ulong> Initialize(ulong address, ulong size, int blockShift, int nextBlockShift, ArraySegment<ulong> bitStorage)
{
Shift = blockShift;
NextShift = nextBlockShift;
ulong endAddress = address + size;
ulong align = nextBlockShift != 0
? 1UL << nextBlockShift
: 1UL << blockShift;
address = BitUtils.AlignDown(address, align);
endAddress = BitUtils.AlignUp (endAddress, align);
_heapAddress = address;
_endOffset = (endAddress - address) / (1UL << blockShift);
return _bitmap.Initialize(bitStorage, _endOffset);
}
public ulong PushBlock(ulong address)
{
ulong offset = (address - _heapAddress) >> Shift;
_bitmap.SetBit(offset);
if (NextShift != 0)
{
int diff = 1 << (NextShift - Shift);
offset = BitUtils.AlignDown(offset, diff);
if (_bitmap.ClearRange(offset, diff))
{
return _heapAddress + (offset << Shift);
}
}
return 0;
}
public ulong PopBlock(bool random)
{
long sOffset = (long)_bitmap.FindFreeBlock(random);
if (sOffset < 0L)
{
return 0;
}
ulong offset = (ulong)sOffset;
_bitmap.ClearBit(offset);
return _heapAddress + (offset << Shift);
}
public static int CalculateManagementOverheadSize(ulong regionSize, int currBlockShift, int nextBlockShift)
{
ulong currBlockSize = 1UL << currBlockShift;
ulong nextBlockSize = 1UL << nextBlockShift;
ulong align = nextBlockShift != 0 ? nextBlockSize : currBlockSize;
return KPageBitmap.CalculateManagementOverheadSize((align * 2 + BitUtils.AlignUp(regionSize, align)) / currBlockSize);
}
}
private static readonly int[] _memoryBlockPageShifts = new int[] { 12, 16, 21, 22, 25, 29, 30 };
private readonly ulong _heapAddress;
private readonly ulong _heapSize;
private ulong _usedSize;
private readonly int _blocksCount;
private readonly Block[] _blocks;
public KPageHeap(ulong address, ulong size) : this(address, size, _memoryBlockPageShifts)
{
}
public KPageHeap(ulong address, ulong size, int[] blockShifts)
{
_heapAddress = address;
_heapSize = size;
_blocksCount = blockShifts.Length;
_blocks = new Block[_memoryBlockPageShifts.Length];
var currBitmapStorage = new ArraySegment<ulong>(new ulong[CalculateManagementOverheadSize(size, blockShifts)]);
for (int i = 0; i < blockShifts.Length; i++)
{
int currBlockShift = blockShifts[i];
int nextBlockShift = i != blockShifts.Length - 1 ? blockShifts[i + 1] : 0;
_blocks[i] = new Block();
currBitmapStorage = _blocks[i].Initialize(address, size, currBlockShift, nextBlockShift, currBitmapStorage);
}
}
public void UpdateUsedSize()
{
_usedSize = _heapSize - (GetFreePagesCount() * KPageTableBase.PageSize);
}
public ulong GetFreePagesCount()
{
ulong freeCount = 0;
for (int i = 0; i < _blocksCount; i++)
{
freeCount += (ulong)_blocks[i].FreePagesCount;
}
return freeCount;
}
public ulong AllocateBlock(int index, bool random)
{
ulong neededSize = _blocks[index].Size;
for (int i = index; i < _blocksCount; i++)
{
ulong address = _blocks[i].PopBlock(random);
if (address != 0)
{
ulong allocatedSize = _blocks[i].Size;
if (allocatedSize > neededSize)
{
Free(address + neededSize, (allocatedSize - neededSize) / KPageTableBase.PageSize);
}
return address;
}
}
return 0;
}
private void FreeBlock(ulong block, int index)
{
do
{
block = _blocks[index++].PushBlock(block);
}
while (block != 0);
}
public void Free(ulong address, ulong pagesCount)
{
if (pagesCount == 0)
{
return;
}
int bigIndex = _blocksCount - 1;
ulong start = address;
ulong end = address + pagesCount * KPageTableBase.PageSize;
ulong beforeStart = start;
ulong beforeEnd = start;
ulong afterStart = end;
ulong afterEnd = end;
while (bigIndex >= 0)
{
ulong blockSize = _blocks[bigIndex].Size;
ulong bigStart = BitUtils.AlignUp (start, blockSize);
ulong bigEnd = BitUtils.AlignDown(end, blockSize);
if (bigStart < bigEnd)
{
for (ulong block = bigStart; block < bigEnd; block += blockSize)
{
FreeBlock(block, bigIndex);
}
beforeEnd = bigStart;
afterStart = bigEnd;
break;
}
bigIndex--;
}
for (int i = bigIndex - 1; i >= 0; i--)
{
ulong blockSize = _blocks[i].Size;
while (beforeStart + blockSize <= beforeEnd)
{
beforeEnd -= blockSize;
FreeBlock(beforeEnd, i);
}
}
for (int i = bigIndex - 1; i >= 0; i--)
{
ulong blockSize = _blocks[i].Size;
while (afterStart + blockSize <= afterEnd)
{
FreeBlock(afterStart, i);
afterStart += blockSize;
}
}
}
public static int GetAlignedBlockIndex(ulong pagesCount, ulong alignPages)
{
ulong targetPages = Math.Max(pagesCount, alignPages);
for (int i = 0; i < _memoryBlockPageShifts.Length; i++)
{
if (targetPages <= GetBlockPagesCount(i))
{
return i;
}
}
return -1;
}
public static int GetBlockIndex(ulong pagesCount)
{
for (int i = _memoryBlockPageShifts.Length - 1; i >= 0; i--)
{
if (pagesCount >= GetBlockPagesCount(i))
{
return i;
}
}
return -1;
}
public static ulong GetBlockSize(int index)
{
return 1UL << _memoryBlockPageShifts[index];
}
public static ulong GetBlockPagesCount(int index)
{
return GetBlockSize(index) / KPageTableBase.PageSize;
}
private static int CalculateManagementOverheadSize(ulong regionSize, int[] blockShifts)
{
int overheadSize = 0;
for (int i = 0; i < blockShifts.Length; i++)
{
int currBlockShift = blockShifts[i];
int nextBlockShift = i != blockShifts.Length - 1 ? blockShifts[i + 1] : 0;
overheadSize += Block.CalculateManagementOverheadSize(regionSize, currBlockShift, nextBlockShift);
}
return BitUtils.AlignUp(overheadSize, KPageTableBase.PageSize);
}
}
}
|
