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
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
|
/** @file
Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions
of the BSD License which accompanies this distribution. The
full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "EmmcBlockIoPei.h"
/**
Allocate a block of memory to be used by the buffer pool.
@param Pages How many pages to allocate.
@return The allocated memory block or NULL if failed.
**/
EMMC_PEIM_MEM_BLOCK *
EmmcPeimAllocMemBlock (
IN UINTN Pages
)
{
EMMC_PEIM_MEM_BLOCK *Block;
VOID *BufHost;
VOID *Mapping;
EFI_PHYSICAL_ADDRESS MappedAddr;
EFI_STATUS Status;
VOID *TempPtr;
TempPtr = NULL;
Block = NULL;
Status = PeiServicesAllocatePool (sizeof(EMMC_PEIM_MEM_BLOCK), &TempPtr);
if (EFI_ERROR (Status)) {
return NULL;
}
ZeroMem ((VOID*)(UINTN)TempPtr, sizeof(EMMC_PEIM_MEM_BLOCK));
//
// each bit in the bit array represents EMMC_PEIM_MEM_UNIT
// bytes of memory in the memory block.
//
ASSERT (EMMC_PEIM_MEM_UNIT * 8 <= EFI_PAGE_SIZE);
Block = (EMMC_PEIM_MEM_BLOCK*)(UINTN)TempPtr;
Block->BufLen = EFI_PAGES_TO_SIZE (Pages);
Block->BitsLen = Block->BufLen / (EMMC_PEIM_MEM_UNIT * 8);
Status = PeiServicesAllocatePool (Block->BitsLen, &TempPtr);
if (EFI_ERROR (Status)) {
return NULL;
}
ZeroMem ((VOID*)(UINTN)TempPtr, Block->BitsLen);
Block->Bits = (UINT8*)(UINTN)TempPtr;
Status = IoMmuAllocateBuffer (
Pages,
&BufHost,
&MappedAddr,
&Mapping
);
if (EFI_ERROR (Status)) {
return NULL;
}
ZeroMem ((VOID*)(UINTN)BufHost, EFI_PAGES_TO_SIZE (Pages));
Block->BufHost = (UINT8 *) (UINTN) BufHost;
Block->Buf = (UINT8 *) (UINTN) MappedAddr;
Block->Mapping = Mapping;
Block->Next = NULL;
return Block;
}
/**
Free the memory block from the memory pool.
@param Pool The memory pool to free the block from.
@param Block The memory block to free.
**/
VOID
EmmcPeimFreeMemBlock (
IN EMMC_PEIM_MEM_POOL *Pool,
IN EMMC_PEIM_MEM_BLOCK *Block
)
{
ASSERT ((Pool != NULL) && (Block != NULL));
IoMmuFreeBuffer (EFI_SIZE_TO_PAGES (Block->BufLen), Block->BufHost, Block->Mapping);
}
/**
Alloc some memory from the block.
@param Block The memory block to allocate memory from.
@param Units Number of memory units to allocate.
@return The pointer to the allocated memory. If couldn't allocate the needed memory,
the return value is NULL.
**/
VOID *
EmmcPeimAllocMemFromBlock (
IN EMMC_PEIM_MEM_BLOCK *Block,
IN UINTN Units
)
{
UINTN Byte;
UINT8 Bit;
UINTN StartByte;
UINT8 StartBit;
UINTN Available;
UINTN Count;
ASSERT ((Block != 0) && (Units != 0));
StartByte = 0;
StartBit = 0;
Available = 0;
for (Byte = 0, Bit = 0; Byte < Block->BitsLen;) {
//
// If current bit is zero, the corresponding memory unit is
// available, otherwise we need to restart our searching.
// Available counts the consective number of zero bit.
//
if (!EMMC_PEIM_MEM_BIT_IS_SET (Block->Bits[Byte], Bit)) {
Available++;
if (Available >= Units) {
break;
}
EMMC_PEIM_NEXT_BIT (Byte, Bit);
} else {
EMMC_PEIM_NEXT_BIT (Byte, Bit);
Available = 0;
StartByte = Byte;
StartBit = Bit;
}
}
if (Available < Units) {
return NULL;
}
//
// Mark the memory as allocated
//
Byte = StartByte;
Bit = StartBit;
for (Count = 0; Count < Units; Count++) {
ASSERT (!EMMC_PEIM_MEM_BIT_IS_SET (Block->Bits[Byte], Bit));
Block->Bits[Byte] = (UINT8) (Block->Bits[Byte] | (UINT8) EMMC_PEIM_MEM_BIT (Bit));
EMMC_PEIM_NEXT_BIT (Byte, Bit);
}
return Block->Buf + (StartByte * 8 + StartBit) * EMMC_PEIM_MEM_UNIT;
}
/**
Insert the memory block to the pool's list of the blocks.
@param Head The head of the memory pool's block list.
@param Block The memory block to insert.
**/
VOID
EmmcPeimInsertMemBlockToPool (
IN EMMC_PEIM_MEM_BLOCK *Head,
IN EMMC_PEIM_MEM_BLOCK *Block
)
{
ASSERT ((Head != NULL) && (Block != NULL));
Block->Next = Head->Next;
Head->Next = Block;
}
/**
Is the memory block empty?
@param Block The memory block to check.
@retval TRUE The memory block is empty.
@retval FALSE The memory block isn't empty.
**/
BOOLEAN
EmmcPeimIsMemBlockEmpty (
IN EMMC_PEIM_MEM_BLOCK *Block
)
{
UINTN Index;
for (Index = 0; Index < Block->BitsLen; Index++) {
if (Block->Bits[Index] != 0) {
return FALSE;
}
}
return TRUE;
}
/**
Initialize the memory management pool for the host controller.
@param Private The Emmc Peim driver private data.
@retval EFI_SUCCESS The memory pool is initialized.
@retval Others Fail to init the memory pool.
**/
EFI_STATUS
EmmcPeimInitMemPool (
IN EMMC_PEIM_HC_PRIVATE_DATA *Private
)
{
EMMC_PEIM_MEM_POOL *Pool;
EFI_STATUS Status;
VOID *TempPtr;
TempPtr = NULL;
Pool = NULL;
Status = PeiServicesAllocatePool (sizeof (EMMC_PEIM_MEM_POOL), &TempPtr);
if (EFI_ERROR (Status)) {
return EFI_OUT_OF_RESOURCES;
}
ZeroMem ((VOID*)(UINTN)TempPtr, sizeof (EMMC_PEIM_MEM_POOL));
Pool = (EMMC_PEIM_MEM_POOL *)((UINTN)TempPtr);
Pool->Head = EmmcPeimAllocMemBlock (EMMC_PEIM_MEM_DEFAULT_PAGES);
if (Pool->Head == NULL) {
return EFI_OUT_OF_RESOURCES;
}
Private->Pool = Pool;
return EFI_SUCCESS;
}
/**
Release the memory management pool.
@param Pool The memory pool to free.
@retval EFI_DEVICE_ERROR Fail to free the memory pool.
@retval EFI_SUCCESS The memory pool is freed.
**/
EFI_STATUS
EmmcPeimFreeMemPool (
IN EMMC_PEIM_MEM_POOL *Pool
)
{
EMMC_PEIM_MEM_BLOCK *Block;
ASSERT (Pool->Head != NULL);
//
// Unlink all the memory blocks from the pool, then free them.
//
for (Block = Pool->Head->Next; Block != NULL; Block = Pool->Head->Next) {
EmmcPeimFreeMemBlock (Pool, Block);
}
EmmcPeimFreeMemBlock (Pool, Pool->Head);
return EFI_SUCCESS;
}
/**
Allocate some memory from the host controller's memory pool
which can be used to communicate with host controller.
@param Pool The host controller's memory pool.
@param Size Size of the memory to allocate.
@return The allocated memory or NULL.
**/
VOID *
EmmcPeimAllocateMem (
IN EMMC_PEIM_MEM_POOL *Pool,
IN UINTN Size
)
{
EMMC_PEIM_MEM_BLOCK *Head;
EMMC_PEIM_MEM_BLOCK *Block;
EMMC_PEIM_MEM_BLOCK *NewBlock;
VOID *Mem;
UINTN AllocSize;
UINTN Pages;
Mem = NULL;
AllocSize = EMMC_PEIM_MEM_ROUND (Size);
Head = Pool->Head;
ASSERT (Head != NULL);
//
// First check whether current memory blocks can satisfy the allocation.
//
for (Block = Head; Block != NULL; Block = Block->Next) {
Mem = EmmcPeimAllocMemFromBlock (Block, AllocSize / EMMC_PEIM_MEM_UNIT);
if (Mem != NULL) {
ZeroMem (Mem, Size);
break;
}
}
if (Mem != NULL) {
return Mem;
}
//
// Create a new memory block if there is not enough memory
// in the pool. If the allocation size is larger than the
// default page number, just allocate a large enough memory
// block. Otherwise allocate default pages.
//
if (AllocSize > EFI_PAGES_TO_SIZE (EMMC_PEIM_MEM_DEFAULT_PAGES)) {
Pages = EFI_SIZE_TO_PAGES (AllocSize) + 1;
} else {
Pages = EMMC_PEIM_MEM_DEFAULT_PAGES;
}
NewBlock = EmmcPeimAllocMemBlock (Pages);
if (NewBlock == NULL) {
return NULL;
}
//
// Add the new memory block to the pool, then allocate memory from it
//
EmmcPeimInsertMemBlockToPool (Head, NewBlock);
Mem = EmmcPeimAllocMemFromBlock (NewBlock, AllocSize / EMMC_PEIM_MEM_UNIT);
if (Mem != NULL) {
ZeroMem (Mem, Size);
}
return Mem;
}
/**
Free the allocated memory back to the memory pool.
@param Pool The memory pool of the host controller.
@param Mem The memory to free.
@param Size The size of the memory to free.
**/
VOID
EmmcPeimFreeMem (
IN EMMC_PEIM_MEM_POOL *Pool,
IN VOID *Mem,
IN UINTN Size
)
{
EMMC_PEIM_MEM_BLOCK *Head;
EMMC_PEIM_MEM_BLOCK *Block;
UINT8 *ToFree;
UINTN AllocSize;
UINTN Byte;
UINTN Bit;
UINTN Count;
Head = Pool->Head;
AllocSize = EMMC_PEIM_MEM_ROUND (Size);
ToFree = (UINT8 *) Mem;
for (Block = Head; Block != NULL; Block = Block->Next) {
//
// scan the memory block list for the memory block that
// completely contains the memory to free.
//
if ((Block->Buf <= ToFree) && ((ToFree + AllocSize) <= (Block->Buf + Block->BufLen))) {
//
// compute the start byte and bit in the bit array
//
Byte = ((ToFree - Block->Buf) / EMMC_PEIM_MEM_UNIT) / 8;
Bit = ((ToFree - Block->Buf) / EMMC_PEIM_MEM_UNIT) % 8;
//
// reset associated bits in bit array
//
for (Count = 0; Count < (AllocSize / EMMC_PEIM_MEM_UNIT); Count++) {
ASSERT (EMMC_PEIM_MEM_BIT_IS_SET (Block->Bits[Byte], Bit));
Block->Bits[Byte] = (UINT8) (Block->Bits[Byte] ^ EMMC_PEIM_MEM_BIT (Bit));
EMMC_PEIM_NEXT_BIT (Byte, Bit);
}
break;
}
}
//
// If Block == NULL, it means that the current memory isn't
// in the host controller's pool. This is critical because
// the caller has passed in a wrong memory point
//
ASSERT (Block != NULL);
//
// Release the current memory block if it is empty and not the head
//
if ((Block != Head) && EmmcPeimIsMemBlockEmpty (Block)) {
EmmcPeimFreeMemBlock (Pool, Block);
}
return ;
}
|