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1 | /** @file\r | |
2 | MTRR setting library\r | |
3 | \r | |
4 | Copyright (c) 2008 - 2011, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include <Base.h>\r | |
16 | \r | |
17 | #include <Library/MtrrLib.h>\r | |
18 | #include <Library/BaseLib.h>\r | |
19 | #include <Library/CpuLib.h>\r | |
20 | #include <Library/BaseMemoryLib.h>\r | |
21 | #include <Library/DebugLib.h>\r | |
22 | \r | |
23 | //\r | |
24 | // This table defines the offset, base and length of the fixed MTRRs\r | |
25 | //\r | |
26 | CONST FIXED_MTRR mMtrrLibFixedMtrrTable[] = {\r | |
27 | {\r | |
28 | MTRR_LIB_IA32_MTRR_FIX64K_00000,\r | |
29 | 0,\r | |
30 | SIZE_64KB\r | |
31 | },\r | |
32 | {\r | |
33 | MTRR_LIB_IA32_MTRR_FIX16K_80000,\r | |
34 | 0x80000,\r | |
35 | SIZE_16KB\r | |
36 | },\r | |
37 | {\r | |
38 | MTRR_LIB_IA32_MTRR_FIX16K_A0000,\r | |
39 | 0xA0000,\r | |
40 | SIZE_16KB\r | |
41 | },\r | |
42 | {\r | |
43 | MTRR_LIB_IA32_MTRR_FIX4K_C0000,\r | |
44 | 0xC0000,\r | |
45 | SIZE_4KB\r | |
46 | },\r | |
47 | {\r | |
48 | MTRR_LIB_IA32_MTRR_FIX4K_C8000,\r | |
49 | 0xC8000,\r | |
50 | SIZE_4KB\r | |
51 | },\r | |
52 | {\r | |
53 | MTRR_LIB_IA32_MTRR_FIX4K_D0000,\r | |
54 | 0xD0000,\r | |
55 | SIZE_4KB\r | |
56 | },\r | |
57 | {\r | |
58 | MTRR_LIB_IA32_MTRR_FIX4K_D8000,\r | |
59 | 0xD8000,\r | |
60 | SIZE_4KB\r | |
61 | },\r | |
62 | {\r | |
63 | MTRR_LIB_IA32_MTRR_FIX4K_E0000,\r | |
64 | 0xE0000,\r | |
65 | SIZE_4KB\r | |
66 | },\r | |
67 | {\r | |
68 | MTRR_LIB_IA32_MTRR_FIX4K_E8000,\r | |
69 | 0xE8000,\r | |
70 | SIZE_4KB\r | |
71 | },\r | |
72 | {\r | |
73 | MTRR_LIB_IA32_MTRR_FIX4K_F0000,\r | |
74 | 0xF0000,\r | |
75 | SIZE_4KB\r | |
76 | },\r | |
77 | {\r | |
78 | MTRR_LIB_IA32_MTRR_FIX4K_F8000,\r | |
79 | 0xF8000,\r | |
80 | SIZE_4KB\r | |
81 | },\r | |
82 | };\r | |
83 | \r | |
84 | //\r | |
85 | // Lookup table used to print MTRRs\r | |
86 | //\r | |
87 | GLOBAL_REMOVE_IF_UNREFERENCED CONST CHAR8 *mMtrrMemoryCacheTypeShortName[] = {\r | |
88 | "UC", // CacheUncacheable\r | |
89 | "WC", // CacheWriteCombining\r | |
90 | "R*", // Invalid\r | |
91 | "R*", // Invalid\r | |
92 | "WT", // CacheWriteThrough\r | |
93 | "WP", // CacheWriteProtected\r | |
94 | "WB", // CacheWriteBack\r | |
95 | "R*" // Invalid\r | |
96 | };\r | |
97 | \r | |
98 | /**\r | |
99 | Returns the variable MTRR count for the CPU.\r | |
100 | \r | |
101 | @return Variable MTRR count\r | |
102 | \r | |
103 | **/\r | |
104 | UINT32\r | |
105 | EFIAPI\r | |
106 | GetVariableMtrrCount (\r | |
107 | VOID\r | |
108 | )\r | |
109 | {\r | |
110 | UINT32 VariableMtrrCount;\r | |
111 | \r | |
112 | if (!IsMtrrSupported ()) {\r | |
113 | return 0;\r | |
114 | }\r | |
115 | \r | |
116 | VariableMtrrCount = (UINT32)(AsmReadMsr64 (MTRR_LIB_IA32_MTRR_CAP) & MTRR_LIB_IA32_MTRR_CAP_VCNT_MASK);\r | |
117 | ASSERT (VariableMtrrCount <= MTRR_NUMBER_OF_VARIABLE_MTRR);\r | |
118 | \r | |
119 | return VariableMtrrCount;\r | |
120 | }\r | |
121 | \r | |
122 | /**\r | |
123 | Returns the firmware usable variable MTRR count for the CPU.\r | |
124 | \r | |
125 | @return Firmware usable variable MTRR count\r | |
126 | \r | |
127 | **/\r | |
128 | UINT32\r | |
129 | EFIAPI\r | |
130 | GetFirmwareVariableMtrrCount (\r | |
131 | VOID\r | |
132 | )\r | |
133 | {\r | |
134 | UINT32 VariableMtrrCount;\r | |
135 | \r | |
136 | VariableMtrrCount = GetVariableMtrrCount ();\r | |
137 | if (VariableMtrrCount < RESERVED_FIRMWARE_VARIABLE_MTRR_NUMBER) {\r | |
138 | return 0;\r | |
139 | }\r | |
140 | \r | |
141 | return VariableMtrrCount - RESERVED_FIRMWARE_VARIABLE_MTRR_NUMBER;\r | |
142 | }\r | |
143 | \r | |
144 | /**\r | |
145 | Returns the default MTRR cache type for the system.\r | |
146 | \r | |
147 | @return MTRR default type\r | |
148 | \r | |
149 | **/\r | |
150 | UINT64\r | |
151 | GetMtrrDefaultMemoryType (\r | |
152 | VOID\r | |
153 | )\r | |
154 | {\r | |
155 | return (AsmReadMsr64 (MTRR_LIB_IA32_MTRR_DEF_TYPE) & 0xff);\r | |
156 | }\r | |
157 | \r | |
158 | \r | |
159 | /**\r | |
160 | Preparation before programming MTRR.\r | |
161 | \r | |
162 | This function will do some preparation for programming MTRRs:\r | |
163 | disable cache, invalid cache and disable MTRR caching functionality\r | |
164 | \r | |
165 | @return CR4 value before changing.\r | |
166 | \r | |
167 | **/\r | |
168 | UINTN\r | |
169 | PreMtrrChange (\r | |
170 | VOID\r | |
171 | )\r | |
172 | {\r | |
173 | UINTN Value;\r | |
174 | \r | |
175 | //\r | |
176 | // Enter no fill cache mode, CD=1(Bit30), NW=0 (Bit29)\r | |
177 | //\r | |
178 | AsmDisableCache ();\r | |
179 | \r | |
180 | //\r | |
181 | // Save original CR4 value and clear PGE flag (Bit 7)\r | |
182 | //\r | |
183 | Value = AsmReadCr4 ();\r | |
184 | AsmWriteCr4 (Value & (~BIT7));\r | |
185 | \r | |
186 | //\r | |
187 | // Flush all TLBs\r | |
188 | //\r | |
189 | CpuFlushTlb ();\r | |
190 | \r | |
191 | //\r | |
192 | // Disable Mtrrs\r | |
193 | //\r | |
194 | AsmMsrBitFieldWrite64 (MTRR_LIB_IA32_MTRR_DEF_TYPE, 10, 11, 0);\r | |
195 | \r | |
196 | //\r | |
197 | // Return original CR4 value\r | |
198 | //\r | |
199 | return Value;\r | |
200 | }\r | |
201 | \r | |
202 | \r | |
203 | /**\r | |
204 | Cleaning up after programming MTRRs.\r | |
205 | \r | |
206 | This function will do some clean up after programming MTRRs:\r | |
207 | enable MTRR caching functionality, and enable cache\r | |
208 | \r | |
209 | @param Cr4 CR4 value to restore\r | |
210 | \r | |
211 | **/\r | |
212 | VOID\r | |
213 | PostMtrrChange (\r | |
214 | UINTN Cr4\r | |
215 | )\r | |
216 | {\r | |
217 | //\r | |
218 | // Enable Cache MTRR\r | |
219 | //\r | |
220 | AsmMsrBitFieldWrite64 (MTRR_LIB_IA32_MTRR_DEF_TYPE, 10, 11, 3);\r | |
221 | \r | |
222 | //\r | |
223 | // Flush all TLBs \r | |
224 | //\r | |
225 | CpuFlushTlb ();\r | |
226 | \r | |
227 | //\r | |
228 | // Enable Normal Mode caching CD=NW=0, CD(Bit30), NW(Bit29)\r | |
229 | //\r | |
230 | AsmEnableCache ();\r | |
231 | \r | |
232 | //\r | |
233 | // Restore original CR4 value\r | |
234 | //\r | |
235 | AsmWriteCr4 (Cr4);\r | |
236 | }\r | |
237 | \r | |
238 | \r | |
239 | /**\r | |
240 | Programs fixed MTRRs registers.\r | |
241 | \r | |
242 | @param MemoryCacheType The memory type to set.\r | |
243 | @param Base The base address of memory range.\r | |
244 | @param Length The length of memory range.\r | |
245 | \r | |
246 | @retval RETURN_SUCCESS The cache type was updated successfully\r | |
247 | @retval RETURN_UNSUPPORTED The requested range or cache type was invalid\r | |
248 | for the fixed MTRRs.\r | |
249 | \r | |
250 | **/\r | |
251 | RETURN_STATUS\r | |
252 | ProgramFixedMtrr (\r | |
253 | IN UINT64 MemoryCacheType,\r | |
254 | IN OUT UINT64 *Base,\r | |
255 | IN OUT UINT64 *Length\r | |
256 | )\r | |
257 | {\r | |
258 | UINT32 MsrNum;\r | |
259 | UINT32 ByteShift;\r | |
260 | UINT64 TempQword;\r | |
261 | UINT64 OrMask;\r | |
262 | UINT64 ClearMask;\r | |
263 | \r | |
264 | TempQword = 0;\r | |
265 | OrMask = 0;\r | |
266 | ClearMask = 0;\r | |
267 | \r | |
268 | for (MsrNum = 0; MsrNum < MTRR_NUMBER_OF_FIXED_MTRR; MsrNum++) {\r | |
269 | if ((*Base >= mMtrrLibFixedMtrrTable[MsrNum].BaseAddress) &&\r | |
270 | (*Base <\r | |
271 | (\r | |
272 | mMtrrLibFixedMtrrTable[MsrNum].BaseAddress +\r | |
273 | (8 * mMtrrLibFixedMtrrTable[MsrNum].Length)\r | |
274 | )\r | |
275 | )\r | |
276 | ) {\r | |
277 | break;\r | |
278 | }\r | |
279 | }\r | |
280 | \r | |
281 | if (MsrNum == MTRR_NUMBER_OF_FIXED_MTRR) {\r | |
282 | return RETURN_UNSUPPORTED;\r | |
283 | }\r | |
284 | \r | |
285 | //\r | |
286 | // We found the fixed MTRR to be programmed\r | |
287 | //\r | |
288 | for (ByteShift = 0; ByteShift < 8; ByteShift++) {\r | |
289 | if (*Base ==\r | |
290 | (\r | |
291 | mMtrrLibFixedMtrrTable[MsrNum].BaseAddress +\r | |
292 | (ByteShift * mMtrrLibFixedMtrrTable[MsrNum].Length)\r | |
293 | )\r | |
294 | ) {\r | |
295 | break;\r | |
296 | }\r | |
297 | }\r | |
298 | \r | |
299 | if (ByteShift == 8) {\r | |
300 | return RETURN_UNSUPPORTED;\r | |
301 | }\r | |
302 | \r | |
303 | for (\r | |
304 | ;\r | |
305 | ((ByteShift < 8) && (*Length >= mMtrrLibFixedMtrrTable[MsrNum].Length));\r | |
306 | ByteShift++\r | |
307 | ) {\r | |
308 | OrMask |= LShiftU64 ((UINT64) MemoryCacheType, (UINT32) (ByteShift * 8));\r | |
309 | ClearMask |= LShiftU64 ((UINT64) 0xFF, (UINT32) (ByteShift * 8));\r | |
310 | *Length -= mMtrrLibFixedMtrrTable[MsrNum].Length;\r | |
311 | *Base += mMtrrLibFixedMtrrTable[MsrNum].Length;\r | |
312 | }\r | |
313 | \r | |
314 | if (ByteShift < 8 && (*Length != 0)) {\r | |
315 | return RETURN_UNSUPPORTED;\r | |
316 | }\r | |
317 | \r | |
318 | TempQword =\r | |
319 | (AsmReadMsr64 (mMtrrLibFixedMtrrTable[MsrNum].Msr) & ~ClearMask) | OrMask;\r | |
320 | AsmWriteMsr64 (mMtrrLibFixedMtrrTable[MsrNum].Msr, TempQword);\r | |
321 | return RETURN_SUCCESS;\r | |
322 | }\r | |
323 | \r | |
324 | \r | |
325 | /**\r | |
326 | Get the attribute of variable MTRRs.\r | |
327 | \r | |
328 | This function shadows the content of variable MTRRs into an\r | |
329 | internal array: VariableMtrr.\r | |
330 | \r | |
331 | @param MtrrValidBitsMask The mask for the valid bit of the MTRR\r | |
332 | @param MtrrValidAddressMask The valid address mask for MTRR\r | |
333 | @param VariableMtrr The array to shadow variable MTRRs content\r | |
334 | \r | |
335 | @return The return value of this paramter indicates the\r | |
336 | number of MTRRs which has been used.\r | |
337 | \r | |
338 | **/\r | |
339 | UINT32\r | |
340 | EFIAPI\r | |
341 | MtrrGetMemoryAttributeInVariableMtrr (\r | |
342 | IN UINT64 MtrrValidBitsMask,\r | |
343 | IN UINT64 MtrrValidAddressMask,\r | |
344 | OUT VARIABLE_MTRR *VariableMtrr\r | |
345 | )\r | |
346 | {\r | |
347 | UINTN Index;\r | |
348 | UINT32 MsrNum;\r | |
349 | UINT32 UsedMtrr;\r | |
350 | UINT32 FirmwareVariableMtrrCount;\r | |
351 | UINT32 VariableMtrrEnd;\r | |
352 | \r | |
353 | if (!IsMtrrSupported ()) {\r | |
354 | return 0;\r | |
355 | }\r | |
356 | \r | |
357 | FirmwareVariableMtrrCount = GetFirmwareVariableMtrrCount ();\r | |
358 | VariableMtrrEnd = MTRR_LIB_IA32_VARIABLE_MTRR_BASE + (2 * GetVariableMtrrCount ()) - 1;\r | |
359 | \r | |
360 | ZeroMem (VariableMtrr, sizeof (VARIABLE_MTRR) * MTRR_NUMBER_OF_VARIABLE_MTRR);\r | |
361 | UsedMtrr = 0;\r | |
362 | \r | |
363 | for (MsrNum = MTRR_LIB_IA32_VARIABLE_MTRR_BASE, Index = 0;\r | |
364 | (\r | |
365 | (MsrNum < VariableMtrrEnd) &&\r | |
366 | (Index < FirmwareVariableMtrrCount)\r | |
367 | );\r | |
368 | MsrNum += 2\r | |
369 | ) {\r | |
370 | if ((AsmReadMsr64 (MsrNum + 1) & MTRR_LIB_CACHE_MTRR_ENABLED) != 0) {\r | |
371 | VariableMtrr[Index].Msr = MsrNum;\r | |
372 | VariableMtrr[Index].BaseAddress = (AsmReadMsr64 (MsrNum) &\r | |
373 | MtrrValidAddressMask);\r | |
374 | VariableMtrr[Index].Length = ((~(AsmReadMsr64 (MsrNum + 1) &\r | |
375 | MtrrValidAddressMask)\r | |
376 | ) &\r | |
377 | MtrrValidBitsMask\r | |
378 | ) + 1;\r | |
379 | VariableMtrr[Index].Type = (AsmReadMsr64 (MsrNum) & 0x0ff);\r | |
380 | VariableMtrr[Index].Valid = TRUE;\r | |
381 | VariableMtrr[Index].Used = TRUE;\r | |
382 | UsedMtrr = UsedMtrr + 1;\r | |
383 | Index++;\r | |
384 | }\r | |
385 | }\r | |
386 | return UsedMtrr;\r | |
387 | }\r | |
388 | \r | |
389 | \r | |
390 | /**\r | |
391 | Checks overlap between given memory range and MTRRs.\r | |
392 | \r | |
393 | @param Start The start address of memory range.\r | |
394 | @param End The end address of memory range.\r | |
395 | @param VariableMtrr The array to shadow variable MTRRs content\r | |
396 | \r | |
397 | @retval TRUE Overlap exists.\r | |
398 | @retval FALSE No overlap.\r | |
399 | \r | |
400 | **/\r | |
401 | BOOLEAN\r | |
402 | CheckMemoryAttributeOverlap (\r | |
403 | IN PHYSICAL_ADDRESS Start,\r | |
404 | IN PHYSICAL_ADDRESS End,\r | |
405 | IN VARIABLE_MTRR *VariableMtrr\r | |
406 | )\r | |
407 | {\r | |
408 | UINT32 Index;\r | |
409 | \r | |
410 | for (Index = 0; Index < 6; Index++) {\r | |
411 | if (\r | |
412 | VariableMtrr[Index].Valid &&\r | |
413 | !(\r | |
414 | (Start > (VariableMtrr[Index].BaseAddress +\r | |
415 | VariableMtrr[Index].Length - 1)\r | |
416 | ) ||\r | |
417 | (End < VariableMtrr[Index].BaseAddress)\r | |
418 | )\r | |
419 | ) {\r | |
420 | return TRUE;\r | |
421 | }\r | |
422 | }\r | |
423 | \r | |
424 | return FALSE;\r | |
425 | }\r | |
426 | \r | |
427 | \r | |
428 | /**\r | |
429 | Marks a variable MTRR as non-valid.\r | |
430 | \r | |
431 | @param Index The index of the array VariableMtrr to be invalidated\r | |
432 | @param VariableMtrr The array to shadow variable MTRRs content\r | |
433 | @param UsedMtrr The number of MTRRs which has already been used\r | |
434 | \r | |
435 | **/\r | |
436 | VOID\r | |
437 | InvalidateShadowMtrr (\r | |
438 | IN UINTN Index,\r | |
439 | IN VARIABLE_MTRR *VariableMtrr,\r | |
440 | OUT UINT32 *UsedMtrr\r | |
441 | )\r | |
442 | {\r | |
443 | VariableMtrr[Index].Valid = FALSE;\r | |
444 | *UsedMtrr = *UsedMtrr - 1;\r | |
445 | }\r | |
446 | \r | |
447 | \r | |
448 | /**\r | |
449 | Combine memory attributes.\r | |
450 | \r | |
451 | If overlap exists between given memory range and MTRRs, try to combine them.\r | |
452 | \r | |
453 | @param Attributes The memory type to set.\r | |
454 | @param Base The base address of memory range.\r | |
455 | @param Length The length of memory range.\r | |
456 | @param VariableMtrr The array to shadow variable MTRRs content\r | |
457 | @param UsedMtrr The number of MTRRs which has already been used\r | |
458 | @param OverwriteExistingMtrr Returns whether an existing MTRR was used\r | |
459 | \r | |
460 | @retval EFI_SUCCESS Memory region successfully combined.\r | |
461 | @retval EFI_ACCESS_DENIED Memory region cannot be combined.\r | |
462 | \r | |
463 | **/\r | |
464 | RETURN_STATUS\r | |
465 | CombineMemoryAttribute (\r | |
466 | IN UINT64 Attributes,\r | |
467 | IN OUT UINT64 *Base,\r | |
468 | IN OUT UINT64 *Length,\r | |
469 | IN VARIABLE_MTRR *VariableMtrr,\r | |
470 | IN OUT UINT32 *UsedMtrr,\r | |
471 | OUT BOOLEAN *OverwriteExistingMtrr\r | |
472 | )\r | |
473 | {\r | |
474 | UINT32 Index;\r | |
475 | UINT64 CombineStart;\r | |
476 | UINT64 CombineEnd;\r | |
477 | UINT64 MtrrEnd;\r | |
478 | UINT64 EndAddress;\r | |
479 | UINT32 FirmwareVariableMtrrCount;\r | |
480 | \r | |
481 | FirmwareVariableMtrrCount = GetFirmwareVariableMtrrCount ();\r | |
482 | \r | |
483 | *OverwriteExistingMtrr = FALSE;\r | |
484 | EndAddress = *Base +*Length - 1;\r | |
485 | \r | |
486 | for (Index = 0; Index < FirmwareVariableMtrrCount; Index++) {\r | |
487 | \r | |
488 | MtrrEnd = VariableMtrr[Index].BaseAddress + VariableMtrr[Index].Length - 1;\r | |
489 | if (\r | |
490 | !VariableMtrr[Index].Valid ||\r | |
491 | (\r | |
492 | *Base > (MtrrEnd) ||\r | |
493 | (EndAddress < VariableMtrr[Index].BaseAddress)\r | |
494 | )\r | |
495 | ) {\r | |
496 | continue;\r | |
497 | }\r | |
498 | \r | |
499 | //\r | |
500 | // Combine same attribute MTRR range\r | |
501 | //\r | |
502 | if (Attributes == VariableMtrr[Index].Type) {\r | |
503 | //\r | |
504 | // if the Mtrr range contain the request range, return RETURN_SUCCESS\r | |
505 | //\r | |
506 | if (VariableMtrr[Index].BaseAddress <= *Base && MtrrEnd >= EndAddress) {\r | |
507 | *Length = 0;\r | |
508 | return RETURN_SUCCESS;\r | |
509 | }\r | |
510 | //\r | |
511 | // invalid this MTRR, and program the combine range\r | |
512 | //\r | |
513 | CombineStart =\r | |
514 | (*Base) < VariableMtrr[Index].BaseAddress ?\r | |
515 | (*Base) :\r | |
516 | VariableMtrr[Index].BaseAddress;\r | |
517 | CombineEnd = EndAddress > MtrrEnd ? EndAddress : MtrrEnd;\r | |
518 | \r | |
519 | //\r | |
520 | // Record the MTRR usage status in VariableMtrr array.\r | |
521 | //\r | |
522 | InvalidateShadowMtrr (Index, VariableMtrr, UsedMtrr);\r | |
523 | *Base = CombineStart;\r | |
524 | *Length = CombineEnd - CombineStart + 1;\r | |
525 | EndAddress = CombineEnd;\r | |
526 | *OverwriteExistingMtrr = TRUE;\r | |
527 | continue;\r | |
528 | } else {\r | |
529 | //\r | |
530 | // The cache type is different, but the range is convered by one MTRR\r | |
531 | //\r | |
532 | if (VariableMtrr[Index].BaseAddress == *Base && MtrrEnd == EndAddress) {\r | |
533 | InvalidateShadowMtrr (Index, VariableMtrr, UsedMtrr);\r | |
534 | continue;\r | |
535 | }\r | |
536 | \r | |
537 | }\r | |
538 | \r | |
539 | if ((Attributes== MTRR_CACHE_WRITE_THROUGH &&\r | |
540 | VariableMtrr[Index].Type == MTRR_CACHE_WRITE_BACK) ||\r | |
541 | (Attributes == MTRR_CACHE_WRITE_BACK &&\r | |
542 | VariableMtrr[Index].Type == MTRR_CACHE_WRITE_THROUGH) ||\r | |
543 | (Attributes == MTRR_CACHE_UNCACHEABLE) ||\r | |
544 | (VariableMtrr[Index].Type == MTRR_CACHE_UNCACHEABLE)\r | |
545 | ) {\r | |
546 | *OverwriteExistingMtrr = TRUE;\r | |
547 | continue;\r | |
548 | }\r | |
549 | //\r | |
550 | // Other type memory overlap is invalid\r | |
551 | //\r | |
552 | return RETURN_ACCESS_DENIED;\r | |
553 | }\r | |
554 | \r | |
555 | return RETURN_SUCCESS;\r | |
556 | }\r | |
557 | \r | |
558 | \r | |
559 | /**\r | |
560 | Calculate the maximum value which is a power of 2, but less the MemoryLength.\r | |
561 | \r | |
562 | @param MemoryLength The number to pass in.\r | |
563 | @return The maximum value which is align to power of 2 and less the MemoryLength\r | |
564 | \r | |
565 | **/\r | |
566 | UINT64\r | |
567 | Power2MaxMemory (\r | |
568 | IN UINT64 MemoryLength\r | |
569 | )\r | |
570 | {\r | |
571 | UINT64 Result;\r | |
572 | \r | |
573 | if (RShiftU64 (MemoryLength, 32) != 0) {\r | |
574 | Result = LShiftU64 (\r | |
575 | (UINT64) GetPowerOfTwo32 (\r | |
576 | (UINT32) RShiftU64 (MemoryLength, 32)\r | |
577 | ),\r | |
578 | 32\r | |
579 | );\r | |
580 | } else {\r | |
581 | Result = (UINT64) GetPowerOfTwo32 ((UINT32) MemoryLength);\r | |
582 | }\r | |
583 | \r | |
584 | return Result;\r | |
585 | }\r | |
586 | \r | |
587 | \r | |
588 | /**\r | |
589 | Check the direction to program variable MTRRs.\r | |
590 | \r | |
591 | This function determines which direction of programming the variable\r | |
592 | MTRRs will use fewer MTRRs.\r | |
593 | \r | |
594 | @param Input Length of Memory to program MTRR\r | |
595 | @param MtrrNumber Pointer to the number of necessary MTRRs\r | |
596 | \r | |
597 | @retval TRUE Positive direction is better.\r | |
598 | FALSE Negtive direction is better.\r | |
599 | \r | |
600 | **/\r | |
601 | BOOLEAN\r | |
602 | GetDirection (\r | |
603 | IN UINT64 Input,\r | |
604 | IN UINTN *MtrrNumber\r | |
605 | )\r | |
606 | {\r | |
607 | UINT64 TempQword;\r | |
608 | UINT32 Positive;\r | |
609 | UINT32 Subtractive;\r | |
610 | \r | |
611 | TempQword = Input;\r | |
612 | Positive = 0;\r | |
613 | Subtractive = 0;\r | |
614 | \r | |
615 | do {\r | |
616 | TempQword -= Power2MaxMemory (TempQword);\r | |
617 | Positive++;\r | |
618 | } while (TempQword != 0);\r | |
619 | \r | |
620 | TempQword = Power2MaxMemory (LShiftU64 (Input, 1)) - Input;\r | |
621 | Subtractive++;\r | |
622 | do {\r | |
623 | TempQword -= Power2MaxMemory (TempQword);\r | |
624 | Subtractive++;\r | |
625 | } while (TempQword != 0);\r | |
626 | \r | |
627 | if (Positive <= Subtractive) {\r | |
628 | *MtrrNumber = Positive;\r | |
629 | return TRUE;\r | |
630 | } else {\r | |
631 | *MtrrNumber = Subtractive;\r | |
632 | return FALSE;\r | |
633 | }\r | |
634 | }\r | |
635 | \r | |
636 | /**\r | |
637 | Invalid variable MTRRs according to the value in the shadow array.\r | |
638 | \r | |
639 | This function programs MTRRs according to the values specified\r | |
640 | in the shadow array.\r | |
641 | \r | |
642 | @param VariableMtrr The array to shadow variable MTRRs content\r | |
643 | \r | |
644 | **/\r | |
645 | VOID\r | |
646 | InvalidateMtrr (\r | |
647 | IN VARIABLE_MTRR *VariableMtrr\r | |
648 | )\r | |
649 | {\r | |
650 | UINTN Index;\r | |
651 | UINTN Cr4;\r | |
652 | UINTN VariableMtrrCount;\r | |
653 | \r | |
654 | Cr4 = PreMtrrChange ();\r | |
655 | Index = 0;\r | |
656 | VariableMtrrCount = GetVariableMtrrCount ();\r | |
657 | while (Index < VariableMtrrCount) {\r | |
658 | if (!VariableMtrr[Index].Valid && VariableMtrr[Index].Used) {\r | |
659 | AsmWriteMsr64 (VariableMtrr[Index].Msr, 0);\r | |
660 | AsmWriteMsr64 (VariableMtrr[Index].Msr + 1, 0);\r | |
661 | VariableMtrr[Index].Used = FALSE;\r | |
662 | }\r | |
663 | Index ++;\r | |
664 | }\r | |
665 | PostMtrrChange (Cr4);\r | |
666 | }\r | |
667 | \r | |
668 | \r | |
669 | /**\r | |
670 | Programs variable MTRRs\r | |
671 | \r | |
672 | This function programs variable MTRRs\r | |
673 | \r | |
674 | @param MtrrNumber Index of MTRR to program.\r | |
675 | @param BaseAddress Base address of memory region.\r | |
676 | @param Length Length of memory region.\r | |
677 | @param MemoryCacheType Memory type to set.\r | |
678 | @param MtrrValidAddressMask The valid address mask for MTRR\r | |
679 | \r | |
680 | **/\r | |
681 | VOID\r | |
682 | ProgramVariableMtrr (\r | |
683 | IN UINTN MtrrNumber,\r | |
684 | IN PHYSICAL_ADDRESS BaseAddress,\r | |
685 | IN UINT64 Length,\r | |
686 | IN UINT64 MemoryCacheType,\r | |
687 | IN UINT64 MtrrValidAddressMask\r | |
688 | )\r | |
689 | {\r | |
690 | UINT64 TempQword;\r | |
691 | UINTN Cr4;\r | |
692 | \r | |
693 | Cr4 = PreMtrrChange ();\r | |
694 | \r | |
695 | //\r | |
696 | // MTRR Physical Base\r | |
697 | //\r | |
698 | TempQword = (BaseAddress & MtrrValidAddressMask) | MemoryCacheType;\r | |
699 | AsmWriteMsr64 ((UINT32) MtrrNumber, TempQword);\r | |
700 | \r | |
701 | //\r | |
702 | // MTRR Physical Mask\r | |
703 | //\r | |
704 | TempQword = ~(Length - 1);\r | |
705 | AsmWriteMsr64 (\r | |
706 | (UINT32) (MtrrNumber + 1),\r | |
707 | (TempQword & MtrrValidAddressMask) | MTRR_LIB_CACHE_MTRR_ENABLED\r | |
708 | );\r | |
709 | \r | |
710 | PostMtrrChange (Cr4);\r | |
711 | }\r | |
712 | \r | |
713 | \r | |
714 | /**\r | |
715 | Convert the Memory attibute value to MTRR_MEMORY_CACHE_TYPE.\r | |
716 | \r | |
717 | @param MtrrType MTRR memory type\r | |
718 | \r | |
719 | @return The enum item in MTRR_MEMORY_CACHE_TYPE\r | |
720 | \r | |
721 | **/\r | |
722 | MTRR_MEMORY_CACHE_TYPE\r | |
723 | GetMemoryCacheTypeFromMtrrType (\r | |
724 | IN UINT64 MtrrType\r | |
725 | )\r | |
726 | {\r | |
727 | switch (MtrrType) {\r | |
728 | case MTRR_CACHE_UNCACHEABLE:\r | |
729 | return CacheUncacheable;\r | |
730 | case MTRR_CACHE_WRITE_COMBINING:\r | |
731 | return CacheWriteCombining;\r | |
732 | case MTRR_CACHE_WRITE_THROUGH:\r | |
733 | return CacheWriteThrough;\r | |
734 | case MTRR_CACHE_WRITE_PROTECTED:\r | |
735 | return CacheWriteProtected;\r | |
736 | case MTRR_CACHE_WRITE_BACK:\r | |
737 | return CacheWriteBack;\r | |
738 | default:\r | |
739 | //\r | |
740 | // MtrrType is MTRR_CACHE_INVALID_TYPE, that means\r | |
741 | // no mtrr covers the range\r | |
742 | //\r | |
743 | return CacheUncacheable;\r | |
744 | }\r | |
745 | }\r | |
746 | \r | |
747 | /**\r | |
748 | Initializes the valid bits mask and valid address mask for MTRRs.\r | |
749 | \r | |
750 | This function initializes the valid bits mask and valid address mask for MTRRs.\r | |
751 | \r | |
752 | @param MtrrValidBitsMask The mask for the valid bit of the MTRR\r | |
753 | @param MtrrValidAddressMask The valid address mask for the MTRR\r | |
754 | \r | |
755 | **/\r | |
756 | VOID\r | |
757 | MtrrLibInitializeMtrrMask (\r | |
758 | OUT UINT64 *MtrrValidBitsMask,\r | |
759 | OUT UINT64 *MtrrValidAddressMask\r | |
760 | )\r | |
761 | {\r | |
762 | UINT32 RegEax;\r | |
763 | UINT8 PhysicalAddressBits;\r | |
764 | \r | |
765 | AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);\r | |
766 | \r | |
767 | if (RegEax >= 0x80000008) {\r | |
768 | AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);\r | |
769 | \r | |
770 | PhysicalAddressBits = (UINT8) RegEax;\r | |
771 | \r | |
772 | *MtrrValidBitsMask = LShiftU64 (1, PhysicalAddressBits) - 1;\r | |
773 | *MtrrValidAddressMask = *MtrrValidBitsMask & 0xfffffffffffff000ULL;\r | |
774 | } else {\r | |
775 | *MtrrValidBitsMask = MTRR_LIB_CACHE_VALID_ADDRESS;\r | |
776 | *MtrrValidAddressMask = 0xFFFFFFFF;\r | |
777 | }\r | |
778 | }\r | |
779 | \r | |
780 | \r | |
781 | /**\r | |
782 | Determing the real attribute of a memory range.\r | |
783 | \r | |
784 | This function is to arbitrate the real attribute of the memory when\r | |
785 | there are 2 MTRR covers the same memory range. For further details,\r | |
786 | please refer the IA32 Software Developer's Manual, Volume 3,\r | |
787 | Section 10.11.4.1.\r | |
788 | \r | |
789 | @param MtrrType1 the first kind of Memory type\r | |
790 | @param MtrrType2 the second kind of memory type\r | |
791 | \r | |
792 | **/\r | |
793 | UINT64\r | |
794 | MtrrPrecedence (\r | |
795 | UINT64 MtrrType1,\r | |
796 | UINT64 MtrrType2\r | |
797 | )\r | |
798 | {\r | |
799 | UINT64 MtrrType;\r | |
800 | \r | |
801 | MtrrType = MTRR_CACHE_INVALID_TYPE;\r | |
802 | switch (MtrrType1) {\r | |
803 | case MTRR_CACHE_UNCACHEABLE:\r | |
804 | MtrrType = MTRR_CACHE_UNCACHEABLE;\r | |
805 | break;\r | |
806 | case MTRR_CACHE_WRITE_COMBINING:\r | |
807 | if (\r | |
808 | MtrrType2==MTRR_CACHE_WRITE_COMBINING ||\r | |
809 | MtrrType2==MTRR_CACHE_UNCACHEABLE\r | |
810 | ) {\r | |
811 | MtrrType = MtrrType2;\r | |
812 | }\r | |
813 | break;\r | |
814 | case MTRR_CACHE_WRITE_THROUGH:\r | |
815 | if (\r | |
816 | MtrrType2==MTRR_CACHE_WRITE_THROUGH ||\r | |
817 | MtrrType2==MTRR_CACHE_WRITE_BACK\r | |
818 | ) {\r | |
819 | MtrrType = MTRR_CACHE_WRITE_THROUGH;\r | |
820 | } else if(MtrrType2==MTRR_CACHE_UNCACHEABLE) {\r | |
821 | MtrrType = MTRR_CACHE_UNCACHEABLE;\r | |
822 | }\r | |
823 | break;\r | |
824 | case MTRR_CACHE_WRITE_PROTECTED:\r | |
825 | if (MtrrType2 == MTRR_CACHE_WRITE_PROTECTED ||\r | |
826 | MtrrType2 == MTRR_CACHE_UNCACHEABLE) {\r | |
827 | MtrrType = MtrrType2;\r | |
828 | }\r | |
829 | break;\r | |
830 | case MTRR_CACHE_WRITE_BACK:\r | |
831 | if (\r | |
832 | MtrrType2== MTRR_CACHE_UNCACHEABLE ||\r | |
833 | MtrrType2==MTRR_CACHE_WRITE_THROUGH ||\r | |
834 | MtrrType2== MTRR_CACHE_WRITE_BACK\r | |
835 | ) {\r | |
836 | MtrrType = MtrrType2;\r | |
837 | }\r | |
838 | break;\r | |
839 | case MTRR_CACHE_INVALID_TYPE:\r | |
840 | MtrrType = MtrrType2;\r | |
841 | break;\r | |
842 | default:\r | |
843 | break;\r | |
844 | }\r | |
845 | \r | |
846 | if (MtrrType2 == MTRR_CACHE_INVALID_TYPE) {\r | |
847 | MtrrType = MtrrType1;\r | |
848 | }\r | |
849 | return MtrrType;\r | |
850 | }\r | |
851 | \r | |
852 | \r | |
853 | /**\r | |
854 | This function attempts to set the attributes for a memory range.\r | |
855 | \r | |
856 | @param BaseAddress The physical address that is the start\r | |
857 | address of a memory region.\r | |
858 | @param Length The size in bytes of the memory region.\r | |
859 | @param Attributes The bit mask of attributes to set for the\r | |
860 | memory region.\r | |
861 | \r | |
862 | @retval RETURN_SUCCESS The attributes were set for the memory\r | |
863 | region.\r | |
864 | @retval RETURN_INVALID_PARAMETER Length is zero.\r | |
865 | @retval RETURN_UNSUPPORTED The processor does not support one or\r | |
866 | more bytes of the memory resource range\r | |
867 | specified by BaseAddress and Length.\r | |
868 | @retval RETURN_UNSUPPORTED The bit mask of attributes is not support\r | |
869 | for the memory resource range specified\r | |
870 | by BaseAddress and Length.\r | |
871 | @retval RETURN_ACCESS_DENIED The attributes for the memory resource\r | |
872 | range specified by BaseAddress and Length\r | |
873 | cannot be modified.\r | |
874 | @retval RETURN_OUT_OF_RESOURCES There are not enough system resources to\r | |
875 | modify the attributes of the memory\r | |
876 | resource range.\r | |
877 | \r | |
878 | **/\r | |
879 | RETURN_STATUS\r | |
880 | EFIAPI\r | |
881 | MtrrSetMemoryAttribute (\r | |
882 | IN PHYSICAL_ADDRESS BaseAddress,\r | |
883 | IN UINT64 Length,\r | |
884 | IN MTRR_MEMORY_CACHE_TYPE Attribute\r | |
885 | )\r | |
886 | {\r | |
887 | UINT64 TempQword;\r | |
888 | RETURN_STATUS Status;\r | |
889 | UINT64 MemoryType;\r | |
890 | UINT64 Remainder;\r | |
891 | BOOLEAN OverLap;\r | |
892 | BOOLEAN Positive;\r | |
893 | UINT32 MsrNum;\r | |
894 | UINTN MtrrNumber;\r | |
895 | VARIABLE_MTRR VariableMtrr[MTRR_NUMBER_OF_VARIABLE_MTRR];\r | |
896 | UINT32 UsedMtrr;\r | |
897 | UINT64 MtrrValidBitsMask;\r | |
898 | UINT64 MtrrValidAddressMask;\r | |
899 | UINTN Cr4;\r | |
900 | BOOLEAN OverwriteExistingMtrr;\r | |
901 | UINT32 FirmwareVariableMtrrCount;\r | |
902 | UINT32 VariableMtrrEnd;\r | |
903 | \r | |
904 | DEBUG((DEBUG_CACHE, "MtrrSetMemoryAttribute() %a:%016lx-%016lx\n", mMtrrMemoryCacheTypeShortName[Attribute], BaseAddress, Length));\r | |
905 | \r | |
906 | if (!IsMtrrSupported ()) {\r | |
907 | Status = RETURN_UNSUPPORTED;\r | |
908 | goto Done;\r | |
909 | }\r | |
910 | \r | |
911 | FirmwareVariableMtrrCount = GetFirmwareVariableMtrrCount ();\r | |
912 | VariableMtrrEnd = MTRR_LIB_IA32_VARIABLE_MTRR_BASE + (2 * GetVariableMtrrCount ()) - 1;\r | |
913 | \r | |
914 | MtrrLibInitializeMtrrMask(&MtrrValidBitsMask, &MtrrValidAddressMask);\r | |
915 | \r | |
916 | TempQword = 0;\r | |
917 | MemoryType = (UINT64)Attribute;\r | |
918 | OverwriteExistingMtrr = FALSE;\r | |
919 | \r | |
920 | //\r | |
921 | // Check for an invalid parameter\r | |
922 | //\r | |
923 | if (Length == 0) {\r | |
924 | Status = RETURN_INVALID_PARAMETER;\r | |
925 | goto Done;\r | |
926 | }\r | |
927 | \r | |
928 | if (\r | |
929 | (BaseAddress & ~MtrrValidAddressMask) != 0 ||\r | |
930 | (Length & ~MtrrValidAddressMask) != 0\r | |
931 | ) {\r | |
932 | Status = RETURN_UNSUPPORTED;\r | |
933 | goto Done;\r | |
934 | }\r | |
935 | \r | |
936 | //\r | |
937 | // Check if Fixed MTRR\r | |
938 | //\r | |
939 | Status = RETURN_SUCCESS;\r | |
940 | while ((BaseAddress < BASE_1MB) && (Length > 0) && Status == RETURN_SUCCESS) {\r | |
941 | Cr4 = PreMtrrChange ();\r | |
942 | Status = ProgramFixedMtrr (MemoryType, &BaseAddress, &Length);\r | |
943 | PostMtrrChange (Cr4);\r | |
944 | if (RETURN_ERROR (Status)) {\r | |
945 | goto Done;\r | |
946 | }\r | |
947 | }\r | |
948 | \r | |
949 | if (Length == 0) {\r | |
950 | //\r | |
951 | // A Length of 0 can only make sense for fixed MTTR ranges.\r | |
952 | // Since we just handled the fixed MTRRs, we can skip the\r | |
953 | // variable MTRR section.\r | |
954 | //\r | |
955 | goto Done;\r | |
956 | }\r | |
957 | \r | |
958 | //\r | |
959 | // Since memory ranges below 1MB will be overridden by the fixed MTRRs,\r | |
960 | // we can set the base to 0 to save variable MTRRs.\r | |
961 | //\r | |
962 | if (BaseAddress == BASE_1MB) {\r | |
963 | BaseAddress = 0;\r | |
964 | Length += SIZE_1MB;\r | |
965 | }\r | |
966 | \r | |
967 | //\r | |
968 | // Check memory base address alignment\r | |
969 | //\r | |
970 | DivU64x64Remainder (BaseAddress, Power2MaxMemory (LShiftU64 (Length, 1)), &Remainder);\r | |
971 | if (Remainder != 0) {\r | |
972 | DivU64x64Remainder (BaseAddress, Power2MaxMemory (Length), &Remainder);\r | |
973 | if (Remainder != 0) {\r | |
974 | Status = RETURN_UNSUPPORTED;\r | |
975 | goto Done;\r | |
976 | }\r | |
977 | }\r | |
978 | \r | |
979 | //\r | |
980 | // Check for overlap\r | |
981 | //\r | |
982 | UsedMtrr = MtrrGetMemoryAttributeInVariableMtrr (MtrrValidBitsMask, MtrrValidAddressMask, VariableMtrr);\r | |
983 | OverLap = CheckMemoryAttributeOverlap (BaseAddress, BaseAddress + Length - 1, VariableMtrr);\r | |
984 | if (OverLap) {\r | |
985 | Status = CombineMemoryAttribute (MemoryType, &BaseAddress, &Length, VariableMtrr, &UsedMtrr, &OverwriteExistingMtrr);\r | |
986 | if (RETURN_ERROR (Status)) {\r | |
987 | goto Done;\r | |
988 | }\r | |
989 | \r | |
990 | if (Length == 0) {\r | |
991 | //\r | |
992 | // Combined successfully\r | |
993 | //\r | |
994 | Status = RETURN_SUCCESS;\r | |
995 | goto Done;\r | |
996 | }\r | |
997 | }\r | |
998 | \r | |
999 | //\r | |
1000 | // Program Variable MTRRs\r | |
1001 | //\r | |
1002 | // Avoid hardcode here and read data dynamically\r | |
1003 | //\r | |
1004 | if (UsedMtrr >= FirmwareVariableMtrrCount) {\r | |
1005 | Status = RETURN_OUT_OF_RESOURCES;\r | |
1006 | goto Done;\r | |
1007 | }\r | |
1008 | \r | |
1009 | //\r | |
1010 | // The memory type is the same with the type specified by\r | |
1011 | // MTRR_LIB_IA32_MTRR_DEF_TYPE.\r | |
1012 | //\r | |
1013 | if ((!OverwriteExistingMtrr) && (Attribute == GetMtrrDefaultMemoryType ())) {\r | |
1014 | //\r | |
1015 | // Invalidate the now-unused MTRRs\r | |
1016 | //\r | |
1017 | InvalidateMtrr(VariableMtrr);\r | |
1018 | goto Done;\r | |
1019 | }\r | |
1020 | \r | |
1021 | TempQword = Length;\r | |
1022 | \r | |
1023 | \r | |
1024 | if (TempQword == Power2MaxMemory (TempQword)) {\r | |
1025 | //\r | |
1026 | // Invalidate the now-unused MTRRs\r | |
1027 | //\r | |
1028 | InvalidateMtrr(VariableMtrr);\r | |
1029 | \r | |
1030 | //\r | |
1031 | // Find first unused MTRR\r | |
1032 | //\r | |
1033 | for (MsrNum = MTRR_LIB_IA32_VARIABLE_MTRR_BASE;\r | |
1034 | MsrNum < VariableMtrrEnd;\r | |
1035 | MsrNum += 2\r | |
1036 | ) {\r | |
1037 | if ((AsmReadMsr64 (MsrNum + 1) & MTRR_LIB_CACHE_MTRR_ENABLED) == 0) {\r | |
1038 | break;\r | |
1039 | }\r | |
1040 | }\r | |
1041 | \r | |
1042 | ProgramVariableMtrr (\r | |
1043 | MsrNum,\r | |
1044 | BaseAddress,\r | |
1045 | Length,\r | |
1046 | MemoryType,\r | |
1047 | MtrrValidAddressMask\r | |
1048 | );\r | |
1049 | } else {\r | |
1050 | \r | |
1051 | Positive = GetDirection (TempQword, &MtrrNumber);\r | |
1052 | \r | |
1053 | if ((UsedMtrr + MtrrNumber) > FirmwareVariableMtrrCount) {\r | |
1054 | Status = RETURN_OUT_OF_RESOURCES;\r | |
1055 | goto Done;\r | |
1056 | }\r | |
1057 | \r | |
1058 | //\r | |
1059 | // Invalidate the now-unused MTRRs\r | |
1060 | //\r | |
1061 | InvalidateMtrr(VariableMtrr);\r | |
1062 | \r | |
1063 | //\r | |
1064 | // Find first unused MTRR\r | |
1065 | //\r | |
1066 | for (MsrNum = MTRR_LIB_IA32_VARIABLE_MTRR_BASE;\r | |
1067 | MsrNum < VariableMtrrEnd;\r | |
1068 | MsrNum += 2\r | |
1069 | ) {\r | |
1070 | if ((AsmReadMsr64 (MsrNum + 1) & MTRR_LIB_CACHE_MTRR_ENABLED) == 0) {\r | |
1071 | break;\r | |
1072 | }\r | |
1073 | }\r | |
1074 | \r | |
1075 | if (!Positive) {\r | |
1076 | Length = Power2MaxMemory (LShiftU64 (TempQword, 1));\r | |
1077 | ProgramVariableMtrr (\r | |
1078 | MsrNum,\r | |
1079 | BaseAddress,\r | |
1080 | Length,\r | |
1081 | MemoryType,\r | |
1082 | MtrrValidAddressMask\r | |
1083 | );\r | |
1084 | BaseAddress += Length;\r | |
1085 | TempQword = Length - TempQword;\r | |
1086 | MemoryType = MTRR_CACHE_UNCACHEABLE;\r | |
1087 | }\r | |
1088 | \r | |
1089 | do {\r | |
1090 | //\r | |
1091 | // Find unused MTRR\r | |
1092 | //\r | |
1093 | for (; MsrNum < VariableMtrrEnd; MsrNum += 2) {\r | |
1094 | if ((AsmReadMsr64 (MsrNum + 1) & MTRR_LIB_CACHE_MTRR_ENABLED) == 0) {\r | |
1095 | break;\r | |
1096 | }\r | |
1097 | }\r | |
1098 | \r | |
1099 | Length = Power2MaxMemory (TempQword);\r | |
1100 | if (!Positive) {\r | |
1101 | BaseAddress -= Length;\r | |
1102 | }\r | |
1103 | \r | |
1104 | ProgramVariableMtrr (\r | |
1105 | MsrNum,\r | |
1106 | BaseAddress,\r | |
1107 | Length,\r | |
1108 | MemoryType,\r | |
1109 | MtrrValidAddressMask\r | |
1110 | );\r | |
1111 | \r | |
1112 | if (Positive) {\r | |
1113 | BaseAddress += Length;\r | |
1114 | }\r | |
1115 | TempQword -= Length;\r | |
1116 | \r | |
1117 | } while (TempQword > 0);\r | |
1118 | }\r | |
1119 | \r | |
1120 | Done:\r | |
1121 | DEBUG((DEBUG_CACHE, " Status = %r\n", Status));\r | |
1122 | if (!RETURN_ERROR (Status)) {\r | |
1123 | MtrrDebugPrintAllMtrrs ();\r | |
1124 | }\r | |
1125 | \r | |
1126 | return Status;\r | |
1127 | }\r | |
1128 | \r | |
1129 | \r | |
1130 | /**\r | |
1131 | This function will get the memory cache type of the specific address.\r | |
1132 | \r | |
1133 | This function is mainly for debug purpose.\r | |
1134 | \r | |
1135 | @param Address The specific address\r | |
1136 | \r | |
1137 | @return Memory cache type of the sepcific address\r | |
1138 | \r | |
1139 | **/\r | |
1140 | MTRR_MEMORY_CACHE_TYPE\r | |
1141 | EFIAPI\r | |
1142 | MtrrGetMemoryAttribute (\r | |
1143 | IN PHYSICAL_ADDRESS Address\r | |
1144 | )\r | |
1145 | {\r | |
1146 | UINT64 TempQword;\r | |
1147 | UINTN Index;\r | |
1148 | UINTN SubIndex;\r | |
1149 | UINT64 MtrrType;\r | |
1150 | UINT64 TempMtrrType;\r | |
1151 | MTRR_MEMORY_CACHE_TYPE CacheType;\r | |
1152 | VARIABLE_MTRR VariableMtrr[MTRR_NUMBER_OF_VARIABLE_MTRR];\r | |
1153 | UINT64 MtrrValidBitsMask;\r | |
1154 | UINT64 MtrrValidAddressMask;\r | |
1155 | UINTN VariableMtrrCount;\r | |
1156 | \r | |
1157 | if (!IsMtrrSupported ()) {\r | |
1158 | return CacheUncacheable;\r | |
1159 | }\r | |
1160 | \r | |
1161 | //\r | |
1162 | // Check if MTRR is enabled, if not, return UC as attribute\r | |
1163 | //\r | |
1164 | TempQword = AsmReadMsr64 (MTRR_LIB_IA32_MTRR_DEF_TYPE);\r | |
1165 | MtrrType = MTRR_CACHE_INVALID_TYPE;\r | |
1166 | \r | |
1167 | if ((TempQword & MTRR_LIB_CACHE_MTRR_ENABLED) == 0) {\r | |
1168 | return CacheUncacheable;\r | |
1169 | }\r | |
1170 | \r | |
1171 | //\r | |
1172 | // If address is less than 1M, then try to go through the fixed MTRR\r | |
1173 | //\r | |
1174 | if (Address < BASE_1MB) {\r | |
1175 | if ((TempQword & MTRR_LIB_CACHE_FIXED_MTRR_ENABLED) != 0) {\r | |
1176 | //\r | |
1177 | // Go through the fixed MTRR\r | |
1178 | //\r | |
1179 | for (Index = 0; Index < MTRR_NUMBER_OF_FIXED_MTRR; Index++) {\r | |
1180 | if (Address >= mMtrrLibFixedMtrrTable[Index].BaseAddress &&\r | |
1181 | Address < (\r | |
1182 | mMtrrLibFixedMtrrTable[Index].BaseAddress +\r | |
1183 | (mMtrrLibFixedMtrrTable[Index].Length * 8)\r | |
1184 | )\r | |
1185 | ) {\r | |
1186 | SubIndex =\r | |
1187 | ((UINTN)Address - mMtrrLibFixedMtrrTable[Index].BaseAddress) /\r | |
1188 | mMtrrLibFixedMtrrTable[Index].Length;\r | |
1189 | TempQword = AsmReadMsr64 (mMtrrLibFixedMtrrTable[Index].Msr);\r | |
1190 | MtrrType = RShiftU64 (TempQword, SubIndex * 8) & 0xFF;\r | |
1191 | return GetMemoryCacheTypeFromMtrrType (MtrrType);\r | |
1192 | }\r | |
1193 | }\r | |
1194 | }\r | |
1195 | }\r | |
1196 | MtrrLibInitializeMtrrMask(&MtrrValidBitsMask, &MtrrValidAddressMask);\r | |
1197 | MtrrGetMemoryAttributeInVariableMtrr(\r | |
1198 | MtrrValidBitsMask,\r | |
1199 | MtrrValidAddressMask,\r | |
1200 | VariableMtrr\r | |
1201 | );\r | |
1202 | \r | |
1203 | //\r | |
1204 | // Go through the variable MTRR\r | |
1205 | //\r | |
1206 | VariableMtrrCount = GetVariableMtrrCount ();\r | |
1207 | ASSERT (VariableMtrrCount <= MTRR_NUMBER_OF_VARIABLE_MTRR);\r | |
1208 | \r | |
1209 | for (Index = 0; Index < VariableMtrrCount; Index++) {\r | |
1210 | if (VariableMtrr[Index].Valid) {\r | |
1211 | if (Address >= VariableMtrr[Index].BaseAddress &&\r | |
1212 | Address < VariableMtrr[Index].BaseAddress+VariableMtrr[Index].Length) {\r | |
1213 | TempMtrrType = VariableMtrr[Index].Type;\r | |
1214 | MtrrType = MtrrPrecedence (MtrrType, TempMtrrType);\r | |
1215 | }\r | |
1216 | }\r | |
1217 | }\r | |
1218 | CacheType = GetMemoryCacheTypeFromMtrrType (MtrrType);\r | |
1219 | \r | |
1220 | return CacheType;\r | |
1221 | }\r | |
1222 | \r | |
1223 | \r | |
1224 | /**\r | |
1225 | This function will get the raw value in variable MTRRs\r | |
1226 | \r | |
1227 | @param VariableSettings A buffer to hold variable MTRRs content.\r | |
1228 | \r | |
1229 | @return The VariableSettings input pointer\r | |
1230 | \r | |
1231 | **/\r | |
1232 | MTRR_VARIABLE_SETTINGS*\r | |
1233 | EFIAPI\r | |
1234 | MtrrGetVariableMtrr (\r | |
1235 | OUT MTRR_VARIABLE_SETTINGS *VariableSettings\r | |
1236 | )\r | |
1237 | {\r | |
1238 | UINT32 Index;\r | |
1239 | UINT32 VariableMtrrCount;\r | |
1240 | \r | |
1241 | if (!IsMtrrSupported ()) {\r | |
1242 | return VariableSettings;\r | |
1243 | }\r | |
1244 | \r | |
1245 | VariableMtrrCount = GetVariableMtrrCount ();\r | |
1246 | ASSERT (VariableMtrrCount <= MTRR_NUMBER_OF_VARIABLE_MTRR);\r | |
1247 | \r | |
1248 | for (Index = 0; Index < VariableMtrrCount; Index++) {\r | |
1249 | VariableSettings->Mtrr[Index].Base =\r | |
1250 | AsmReadMsr64 (MTRR_LIB_IA32_VARIABLE_MTRR_BASE + (Index << 1));\r | |
1251 | VariableSettings->Mtrr[Index].Mask =\r | |
1252 | AsmReadMsr64 (MTRR_LIB_IA32_VARIABLE_MTRR_BASE + (Index << 1) + 1);\r | |
1253 | }\r | |
1254 | \r | |
1255 | return VariableSettings;\r | |
1256 | }\r | |
1257 | \r | |
1258 | \r | |
1259 | /**\r | |
1260 | Worker function setting variable MTRRs\r | |
1261 | \r | |
1262 | @param VariableSettings A buffer to hold variable MTRRs content.\r | |
1263 | \r | |
1264 | **/\r | |
1265 | VOID\r | |
1266 | MtrrSetVariableMtrrWorker (\r | |
1267 | IN MTRR_VARIABLE_SETTINGS *VariableSettings\r | |
1268 | )\r | |
1269 | {\r | |
1270 | UINT32 Index;\r | |
1271 | UINT32 VariableMtrrCount;\r | |
1272 | \r | |
1273 | VariableMtrrCount = GetVariableMtrrCount ();\r | |
1274 | ASSERT (VariableMtrrCount <= MTRR_NUMBER_OF_VARIABLE_MTRR);\r | |
1275 | \r | |
1276 | for (Index = 0; Index < VariableMtrrCount; Index++) {\r | |
1277 | AsmWriteMsr64 (\r | |
1278 | MTRR_LIB_IA32_VARIABLE_MTRR_BASE + (Index << 1),\r | |
1279 | VariableSettings->Mtrr[Index].Base\r | |
1280 | );\r | |
1281 | AsmWriteMsr64 (\r | |
1282 | MTRR_LIB_IA32_VARIABLE_MTRR_BASE + (Index << 1) + 1,\r | |
1283 | VariableSettings->Mtrr[Index].Mask\r | |
1284 | );\r | |
1285 | }\r | |
1286 | }\r | |
1287 | \r | |
1288 | \r | |
1289 | /**\r | |
1290 | This function sets variable MTRRs\r | |
1291 | \r | |
1292 | @param VariableSettings A buffer to hold variable MTRRs content.\r | |
1293 | \r | |
1294 | @return The pointer of VariableSettings\r | |
1295 | \r | |
1296 | **/\r | |
1297 | MTRR_VARIABLE_SETTINGS*\r | |
1298 | EFIAPI\r | |
1299 | MtrrSetVariableMtrr (\r | |
1300 | IN MTRR_VARIABLE_SETTINGS *VariableSettings\r | |
1301 | )\r | |
1302 | {\r | |
1303 | UINTN Cr4;\r | |
1304 | \r | |
1305 | if (!IsMtrrSupported ()) {\r | |
1306 | return VariableSettings;\r | |
1307 | }\r | |
1308 | \r | |
1309 | Cr4 = PreMtrrChange ();\r | |
1310 | MtrrSetVariableMtrrWorker (VariableSettings);\r | |
1311 | PostMtrrChange (Cr4);\r | |
1312 | return VariableSettings;\r | |
1313 | }\r | |
1314 | \r | |
1315 | \r | |
1316 | /**\r | |
1317 | This function gets the content in fixed MTRRs\r | |
1318 | \r | |
1319 | @param FixedSettings A buffer to hold fixed Mtrrs content.\r | |
1320 | \r | |
1321 | @retval The pointer of FixedSettings\r | |
1322 | \r | |
1323 | **/\r | |
1324 | MTRR_FIXED_SETTINGS*\r | |
1325 | EFIAPI\r | |
1326 | MtrrGetFixedMtrr (\r | |
1327 | OUT MTRR_FIXED_SETTINGS *FixedSettings\r | |
1328 | )\r | |
1329 | {\r | |
1330 | UINT32 Index;\r | |
1331 | \r | |
1332 | if (!IsMtrrSupported ()) {\r | |
1333 | return FixedSettings;\r | |
1334 | }\r | |
1335 | \r | |
1336 | for (Index = 0; Index < MTRR_NUMBER_OF_FIXED_MTRR; Index++) {\r | |
1337 | FixedSettings->Mtrr[Index] =\r | |
1338 | AsmReadMsr64 (mMtrrLibFixedMtrrTable[Index].Msr);\r | |
1339 | };\r | |
1340 | \r | |
1341 | return FixedSettings;\r | |
1342 | }\r | |
1343 | \r | |
1344 | /**\r | |
1345 | Worker function setting fixed MTRRs\r | |
1346 | \r | |
1347 | @param FixedSettings A buffer to hold fixed Mtrrs content.\r | |
1348 | \r | |
1349 | **/\r | |
1350 | VOID\r | |
1351 | MtrrSetFixedMtrrWorker (\r | |
1352 | IN MTRR_FIXED_SETTINGS *FixedSettings\r | |
1353 | )\r | |
1354 | {\r | |
1355 | UINT32 Index;\r | |
1356 | \r | |
1357 | for (Index = 0; Index < MTRR_NUMBER_OF_FIXED_MTRR; Index++) {\r | |
1358 | AsmWriteMsr64 (\r | |
1359 | mMtrrLibFixedMtrrTable[Index].Msr,\r | |
1360 | FixedSettings->Mtrr[Index]\r | |
1361 | );\r | |
1362 | }\r | |
1363 | }\r | |
1364 | \r | |
1365 | \r | |
1366 | /**\r | |
1367 | This function sets fixed MTRRs\r | |
1368 | \r | |
1369 | @param FixedSettings A buffer to hold fixed Mtrrs content.\r | |
1370 | \r | |
1371 | @retval The pointer of FixedSettings\r | |
1372 | \r | |
1373 | **/\r | |
1374 | MTRR_FIXED_SETTINGS*\r | |
1375 | EFIAPI\r | |
1376 | MtrrSetFixedMtrr (\r | |
1377 | IN MTRR_FIXED_SETTINGS *FixedSettings\r | |
1378 | )\r | |
1379 | {\r | |
1380 | UINTN Cr4;\r | |
1381 | \r | |
1382 | if (!IsMtrrSupported ()) {\r | |
1383 | return FixedSettings;\r | |
1384 | }\r | |
1385 | \r | |
1386 | Cr4 = PreMtrrChange ();\r | |
1387 | MtrrSetFixedMtrrWorker (FixedSettings);\r | |
1388 | PostMtrrChange (Cr4);\r | |
1389 | \r | |
1390 | return FixedSettings;\r | |
1391 | }\r | |
1392 | \r | |
1393 | \r | |
1394 | /**\r | |
1395 | This function gets the content in all MTRRs (variable and fixed)\r | |
1396 | \r | |
1397 | @param MtrrSetting A buffer to hold all Mtrrs content.\r | |
1398 | \r | |
1399 | @retval the pointer of MtrrSetting\r | |
1400 | \r | |
1401 | **/\r | |
1402 | MTRR_SETTINGS *\r | |
1403 | EFIAPI\r | |
1404 | MtrrGetAllMtrrs (\r | |
1405 | OUT MTRR_SETTINGS *MtrrSetting\r | |
1406 | )\r | |
1407 | {\r | |
1408 | if (!IsMtrrSupported ()) {\r | |
1409 | return MtrrSetting;\r | |
1410 | }\r | |
1411 | \r | |
1412 | //\r | |
1413 | // Get fixed MTRRs\r | |
1414 | //\r | |
1415 | MtrrGetFixedMtrr (&MtrrSetting->Fixed);\r | |
1416 | \r | |
1417 | //\r | |
1418 | // Get variable MTRRs\r | |
1419 | //\r | |
1420 | MtrrGetVariableMtrr (&MtrrSetting->Variables);\r | |
1421 | \r | |
1422 | //\r | |
1423 | // Get MTRR_DEF_TYPE value\r | |
1424 | //\r | |
1425 | MtrrSetting->MtrrDefType = AsmReadMsr64 (MTRR_LIB_IA32_MTRR_DEF_TYPE);\r | |
1426 | \r | |
1427 | return MtrrSetting;\r | |
1428 | }\r | |
1429 | \r | |
1430 | \r | |
1431 | /**\r | |
1432 | This function sets all MTRRs (variable and fixed)\r | |
1433 | \r | |
1434 | @param MtrrSetting A buffer holding all MTRRs content.\r | |
1435 | \r | |
1436 | @retval The pointer of MtrrSetting\r | |
1437 | \r | |
1438 | **/\r | |
1439 | MTRR_SETTINGS *\r | |
1440 | EFIAPI\r | |
1441 | MtrrSetAllMtrrs (\r | |
1442 | IN MTRR_SETTINGS *MtrrSetting\r | |
1443 | )\r | |
1444 | {\r | |
1445 | UINTN Cr4;\r | |
1446 | \r | |
1447 | if (!IsMtrrSupported ()) {\r | |
1448 | return MtrrSetting;\r | |
1449 | }\r | |
1450 | \r | |
1451 | Cr4 = PreMtrrChange ();\r | |
1452 | \r | |
1453 | //\r | |
1454 | // Set fixed MTRRs\r | |
1455 | //\r | |
1456 | MtrrSetFixedMtrrWorker (&MtrrSetting->Fixed);\r | |
1457 | \r | |
1458 | //\r | |
1459 | // Set variable MTRRs\r | |
1460 | //\r | |
1461 | MtrrSetVariableMtrrWorker (&MtrrSetting->Variables);\r | |
1462 | \r | |
1463 | //\r | |
1464 | // Set MTRR_DEF_TYPE value\r | |
1465 | //\r | |
1466 | AsmWriteMsr64 (MTRR_LIB_IA32_MTRR_DEF_TYPE, MtrrSetting->MtrrDefType);\r | |
1467 | \r | |
1468 | PostMtrrChange (Cr4);\r | |
1469 | \r | |
1470 | return MtrrSetting;\r | |
1471 | }\r | |
1472 | \r | |
1473 | /**\r | |
1474 | This function prints all MTRRs for debugging.\r | |
1475 | **/\r | |
1476 | VOID\r | |
1477 | EFIAPI\r | |
1478 | MtrrDebugPrintAllMtrrs (\r | |
1479 | VOID\r | |
1480 | )\r | |
1481 | {\r | |
1482 | DEBUG_CODE (\r | |
1483 | MTRR_SETTINGS MtrrSettings;\r | |
1484 | UINTN Index;\r | |
1485 | UINTN Index1;\r | |
1486 | UINTN VariableMtrrCount;\r | |
1487 | UINT64 Base;\r | |
1488 | UINT64 Limit;\r | |
1489 | UINT64 MtrrBase;\r | |
1490 | UINT64 MtrrLimit;\r | |
1491 | UINT64 RangeBase;\r | |
1492 | UINT64 RangeLimit;\r | |
1493 | UINT64 NoRangeBase;\r | |
1494 | UINT64 NoRangeLimit;\r | |
1495 | UINT32 RegEax;\r | |
1496 | UINTN MemoryType;\r | |
1497 | UINTN PreviousMemoryType;\r | |
1498 | BOOLEAN Found;\r | |
1499 | \r | |
1500 | if (!IsMtrrSupported ()) {\r | |
1501 | return;\r | |
1502 | }\r | |
1503 | \r | |
1504 | DEBUG((DEBUG_CACHE, "MTRR Settings\n"));\r | |
1505 | DEBUG((DEBUG_CACHE, "=============\n"));\r | |
1506 | \r | |
1507 | MtrrGetAllMtrrs (&MtrrSettings);\r | |
1508 | DEBUG((DEBUG_CACHE, "MTRR Default Type: %016lx\n", MtrrSettings.MtrrDefType));\r | |
1509 | for (Index = 0; Index < MTRR_NUMBER_OF_FIXED_MTRR; Index++) {\r | |
1510 | DEBUG((DEBUG_CACHE, "Fixed MTRR[%02d] : %016lx\n", Index, MtrrSettings.Fixed.Mtrr[Index]));\r | |
1511 | }\r | |
1512 | \r | |
1513 | VariableMtrrCount = GetVariableMtrrCount ();\r | |
1514 | for (Index = 0; Index < VariableMtrrCount; Index++) {\r | |
1515 | DEBUG((DEBUG_CACHE, "Variable MTRR[%02d]: Base=%016lx Mask=%016lx\n",\r | |
1516 | Index,\r | |
1517 | MtrrSettings.Variables.Mtrr[Index].Base,\r | |
1518 | MtrrSettings.Variables.Mtrr[Index].Mask\r | |
1519 | ));\r | |
1520 | }\r | |
1521 | DEBUG((DEBUG_CACHE, "\n"));\r | |
1522 | DEBUG((DEBUG_CACHE, "MTRR Ranges\n"));\r | |
1523 | DEBUG((DEBUG_CACHE, "====================================\n"));\r | |
1524 | \r | |
1525 | Base = 0;\r | |
1526 | PreviousMemoryType = MTRR_CACHE_INVALID_TYPE;\r | |
1527 | for (Index = 0; Index < MTRR_NUMBER_OF_FIXED_MTRR; Index++) {\r | |
1528 | Base = mMtrrLibFixedMtrrTable[Index].BaseAddress;\r | |
1529 | for (Index1 = 0; Index1 < 8; Index1++) {\r | |
1530 | MemoryType = (UINTN)(RShiftU64 (MtrrSettings.Fixed.Mtrr[Index], Index1 * 8) & 0xff);\r | |
1531 | if (MemoryType > CacheWriteBack) {\r | |
1532 | MemoryType = MTRR_CACHE_INVALID_TYPE;\r | |
1533 | } \r | |
1534 | if (MemoryType != PreviousMemoryType) {\r | |
1535 | if (PreviousMemoryType != MTRR_CACHE_INVALID_TYPE) {\r | |
1536 | DEBUG((DEBUG_CACHE, "%016lx\n", Base - 1));\r | |
1537 | }\r | |
1538 | PreviousMemoryType = MemoryType;\r | |
1539 | DEBUG((DEBUG_CACHE, "%a:%016lx-", mMtrrMemoryCacheTypeShortName[MemoryType], Base));\r | |
1540 | }\r | |
1541 | Base += mMtrrLibFixedMtrrTable[Index].Length;\r | |
1542 | }\r | |
1543 | }\r | |
1544 | DEBUG((DEBUG_CACHE, "%016lx\n", Base - 1));\r | |
1545 | \r | |
1546 | VariableMtrrCount = GetVariableMtrrCount ();\r | |
1547 | \r | |
1548 | Base = BASE_1MB;\r | |
1549 | PreviousMemoryType = MTRR_CACHE_INVALID_TYPE;\r | |
1550 | do {\r | |
1551 | MemoryType = MtrrGetMemoryAttribute (Base);\r | |
1552 | if (MemoryType > CacheWriteBack) {\r | |
1553 | MemoryType = MTRR_CACHE_INVALID_TYPE;\r | |
1554 | }\r | |
1555 | \r | |
1556 | if (MemoryType != PreviousMemoryType) {\r | |
1557 | if (PreviousMemoryType != MTRR_CACHE_INVALID_TYPE) {\r | |
1558 | DEBUG((DEBUG_CACHE, "%016lx\n", Base - 1));\r | |
1559 | }\r | |
1560 | PreviousMemoryType = MemoryType;\r | |
1561 | DEBUG((DEBUG_CACHE, "%a:%016lx-", mMtrrMemoryCacheTypeShortName[MemoryType], Base));\r | |
1562 | }\r | |
1563 | \r | |
1564 | RangeBase = BASE_1MB; \r | |
1565 | NoRangeBase = BASE_1MB;\r | |
1566 | Limit = BIT36 - 1;\r | |
1567 | AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);\r | |
1568 | if (RegEax >= 0x80000008) {\r | |
1569 | AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);\r | |
1570 | Limit = LShiftU64 (1, RegEax & 0xff) - 1;\r | |
1571 | }\r | |
1572 | RangeLimit = Limit;\r | |
1573 | NoRangeLimit = Limit;\r | |
1574 | \r | |
1575 | for (Index = 0, Found = FALSE; Index < VariableMtrrCount; Index++) {\r | |
1576 | if ((MtrrSettings.Variables.Mtrr[Index].Mask & BIT11) == 0) {\r | |
1577 | //\r | |
1578 | // If mask is not valid, then do not display range\r | |
1579 | //\r | |
1580 | continue;\r | |
1581 | }\r | |
1582 | MtrrBase = (MtrrSettings.Variables.Mtrr[Index].Base & (~(SIZE_4KB - 1)));\r | |
1583 | MtrrLimit = MtrrBase + ((~(MtrrSettings.Variables.Mtrr[Index].Mask & (~(SIZE_4KB - 1)))) & Limit);\r | |
1584 | \r | |
1585 | if (Base >= MtrrBase && Base < MtrrLimit) {\r | |
1586 | Found = TRUE;\r | |
1587 | }\r | |
1588 | \r | |
1589 | if (Base >= MtrrBase && MtrrBase > RangeBase) {\r | |
1590 | RangeBase = MtrrBase;\r | |
1591 | }\r | |
1592 | if (Base > MtrrLimit && MtrrLimit > RangeBase) {\r | |
1593 | RangeBase = MtrrLimit + 1;\r | |
1594 | }\r | |
1595 | if (Base < MtrrBase && MtrrBase < RangeLimit) {\r | |
1596 | RangeLimit = MtrrBase - 1;\r | |
1597 | }\r | |
1598 | if (Base < MtrrLimit && MtrrLimit <= RangeLimit) {\r | |
1599 | RangeLimit = MtrrLimit;\r | |
1600 | }\r | |
1601 | \r | |
1602 | if (Base > MtrrLimit && NoRangeBase < MtrrLimit) {\r | |
1603 | NoRangeBase = MtrrLimit + 1;\r | |
1604 | }\r | |
1605 | if (Base < MtrrBase && NoRangeLimit > MtrrBase) {\r | |
1606 | NoRangeLimit = MtrrBase - 1;\r | |
1607 | }\r | |
1608 | }\r | |
1609 | \r | |
1610 | if (Found) {\r | |
1611 | Base = RangeLimit + 1;\r | |
1612 | } else {\r | |
1613 | Base = NoRangeLimit + 1;\r | |
1614 | }\r | |
1615 | } while (Found);\r | |
1616 | DEBUG((DEBUG_CACHE, "%016lx\n\n", Base - 1));\r | |
1617 | );\r | |
1618 | }\r | |
1619 | \r | |
1620 | /**\r | |
1621 | Checks if MTRR is supported.\r | |
1622 | \r | |
1623 | @retval TRUE MTRR is supported.\r | |
1624 | @retval FALSE MTRR is not supported.\r | |
1625 | \r | |
1626 | **/\r | |
1627 | BOOLEAN\r | |
1628 | EFIAPI\r | |
1629 | IsMtrrSupported (\r | |
1630 | VOID\r | |
1631 | )\r | |
1632 | {\r | |
1633 | UINT32 RegEdx;\r | |
1634 | UINT64 MtrrCap;\r | |
1635 | \r | |
1636 | //\r | |
1637 | // Check CPUID(1).EDX[12] for MTRR capability\r | |
1638 | //\r | |
1639 | AsmCpuid (1, NULL, NULL, NULL, &RegEdx);\r | |
1640 | if (BitFieldRead32 (RegEdx, 12, 12) == 0) {\r | |
1641 | return FALSE;\r | |
1642 | }\r | |
1643 | \r | |
1644 | //\r | |
1645 | // Check IA32_MTRRCAP.[0..7] for number of variable MTRRs and IA32_MTRRCAP[8] for\r | |
1646 | // fixed MTRRs existence. If number of variable MTRRs is zero, or fixed MTRRs do not\r | |
1647 | // exist, return false.\r | |
1648 | //\r | |
1649 | MtrrCap = AsmReadMsr64 (MTRR_LIB_IA32_MTRR_CAP);\r | |
1650 | if ((BitFieldRead64 (MtrrCap, 0, 7) == 0) || (BitFieldRead64 (MtrrCap, 8, 8) == 0)) {\r | |
1651 | return FALSE;\r | |
1652 | }\r | |
1653 | \r | |
1654 | return TRUE;\r | |
1655 | }\r |