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OvmfPkg: SmmCpuFeaturesLib: customize state save map format
[mirror_edk2.git] / OvmfPkg / Library / SmmCpuFeaturesLib / SmmCpuFeaturesLib.c
1 /** @file
2 The CPU specific programming for PiSmmCpuDxeSmm module.
3
4 Copyright (c) 2010 - 2015, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 **/
14
15 #include <PiSmm.h>
16 #include <Library/SmmCpuFeaturesLib.h>
17 #include <Library/BaseLib.h>
18 #include <Library/BaseMemoryLib.h>
19 #include <Library/PcdLib.h>
20 #include <Library/MemoryAllocationLib.h>
21 #include <Library/SmmServicesTableLib.h>
22 #include <Library/DebugLib.h>
23 #include <Register/QemuSmramSaveStateMap.h>
24
25 //
26 // EFER register LMA bit
27 //
28 #define LMA BIT10
29
30 /**
31 The constructor function
32
33 @param[in] ImageHandle The firmware allocated handle for the EFI image.
34 @param[in] SystemTable A pointer to the EFI System Table.
35
36 @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
37
38 **/
39 EFI_STATUS
40 EFIAPI
41 SmmCpuFeaturesLibConstructor (
42 IN EFI_HANDLE ImageHandle,
43 IN EFI_SYSTEM_TABLE *SystemTable
44 )
45 {
46 //
47 // No need to program SMRRs on our virtual platform.
48 //
49 return EFI_SUCCESS;
50 }
51
52 /**
53 Called during the very first SMI into System Management Mode to initialize
54 CPU features, including SMBASE, for the currently executing CPU. Since this
55 is the first SMI, the SMRAM Save State Map is at the default address of
56 SMM_DEFAULT_SMBASE + SMRAM_SAVE_STATE_MAP_OFFSET. The currently executing
57 CPU is specified by CpuIndex and CpuIndex can be used to access information
58 about the currently executing CPU in the ProcessorInfo array and the
59 HotPlugCpuData data structure.
60
61 @param[in] CpuIndex The index of the CPU to initialize. The value
62 must be between 0 and the NumberOfCpus field in
63 the System Management System Table (SMST).
64 @param[in] IsMonarch TRUE if the CpuIndex is the index of the CPU that
65 was elected as monarch during System Management
66 Mode initialization.
67 FALSE if the CpuIndex is not the index of the CPU
68 that was elected as monarch during System
69 Management Mode initialization.
70 @param[in] ProcessorInfo Pointer to an array of EFI_PROCESSOR_INFORMATION
71 structures. ProcessorInfo[CpuIndex] contains the
72 information for the currently executing CPU.
73 @param[in] CpuHotPlugData Pointer to the CPU_HOT_PLUG_DATA structure that
74 contains the ApidId and SmBase arrays.
75 **/
76 VOID
77 EFIAPI
78 SmmCpuFeaturesInitializeProcessor (
79 IN UINTN CpuIndex,
80 IN BOOLEAN IsMonarch,
81 IN EFI_PROCESSOR_INFORMATION *ProcessorInfo,
82 IN CPU_HOT_PLUG_DATA *CpuHotPlugData
83 )
84 {
85 QEMU_SMRAM_SAVE_STATE_MAP *CpuState;
86
87 //
88 // Configure SMBASE.
89 //
90 CpuState = (QEMU_SMRAM_SAVE_STATE_MAP *)(UINTN)(SMM_DEFAULT_SMBASE + SMRAM_SAVE_STATE_MAP_OFFSET);
91 if ((CpuState->x86.SMMRevId & 0xFFFF) == 0) {
92 CpuState->x86.SMBASE = (UINT32)CpuHotPlugData->SmBase[CpuIndex];
93 } else {
94 CpuState->x64.SMBASE = (UINT32)CpuHotPlugData->SmBase[CpuIndex];
95 }
96
97 //
98 // No need to program SMRRs on our virtual platform.
99 //
100 }
101
102 /**
103 This function updates the SMRAM save state on the currently executing CPU
104 to resume execution at a specific address after an RSM instruction. This
105 function must evaluate the SMRAM save state to determine the execution mode
106 the RSM instruction resumes and update the resume execution address with
107 either NewInstructionPointer32 or NewInstructionPoint. The auto HALT restart
108 flag in the SMRAM save state must always be cleared. This function returns
109 the value of the instruction pointer from the SMRAM save state that was
110 replaced. If this function returns 0, then the SMRAM save state was not
111 modified.
112
113 This function is called during the very first SMI on each CPU after
114 SmmCpuFeaturesInitializeProcessor() to set a flag in normal execution mode
115 to signal that the SMBASE of each CPU has been updated before the default
116 SMBASE address is used for the first SMI to the next CPU.
117
118 @param[in] CpuIndex The index of the CPU to hook. The value
119 must be between 0 and the NumberOfCpus
120 field in the System Management System Table
121 (SMST).
122 @param[in] CpuState Pointer to SMRAM Save State Map for the
123 currently executing CPU.
124 @param[in] NewInstructionPointer32 Instruction pointer to use if resuming to
125 32-bit execution mode from 64-bit SMM.
126 @param[in] NewInstructionPointer Instruction pointer to use if resuming to
127 same execution mode as SMM.
128
129 @retval 0 This function did modify the SMRAM save state.
130 @retval > 0 The original instruction pointer value from the SMRAM save state
131 before it was replaced.
132 **/
133 UINT64
134 EFIAPI
135 SmmCpuFeaturesHookReturnFromSmm (
136 IN UINTN CpuIndex,
137 IN SMRAM_SAVE_STATE_MAP *CpuState,
138 IN UINT64 NewInstructionPointer32,
139 IN UINT64 NewInstructionPointer
140 )
141 {
142 UINT64 OriginalInstructionPointer;
143 QEMU_SMRAM_SAVE_STATE_MAP *CpuSaveState = (QEMU_SMRAM_SAVE_STATE_MAP *)CpuState;
144
145 if ((CpuSaveState->x86.SMMRevId & 0xFFFF) == 0) {
146 OriginalInstructionPointer = (UINT64)CpuSaveState->x86._EIP;
147 CpuSaveState->x86._EIP = (UINT32)NewInstructionPointer;
148 //
149 // Clear the auto HALT restart flag so the RSM instruction returns
150 // program control to the instruction following the HLT instruction.
151 //
152 if ((CpuSaveState->x86.AutoHALTRestart & BIT0) != 0) {
153 CpuSaveState->x86.AutoHALTRestart &= ~BIT0;
154 }
155 } else {
156 OriginalInstructionPointer = CpuSaveState->x64._RIP;
157 if ((CpuSaveState->x64.IA32_EFER & LMA) == 0) {
158 CpuSaveState->x64._RIP = (UINT32)NewInstructionPointer32;
159 } else {
160 CpuSaveState->x64._RIP = (UINT32)NewInstructionPointer;
161 }
162 //
163 // Clear the auto HALT restart flag so the RSM instruction returns
164 // program control to the instruction following the HLT instruction.
165 //
166 if ((CpuSaveState->x64.AutoHALTRestart & BIT0) != 0) {
167 CpuSaveState->x64.AutoHALTRestart &= ~BIT0;
168 }
169 }
170 return OriginalInstructionPointer;
171 }
172
173 /**
174 Hook point in normal execution mode that allows the one CPU that was elected
175 as monarch during System Management Mode initialization to perform additional
176 initialization actions immediately after all of the CPUs have processed their
177 first SMI and called SmmCpuFeaturesInitializeProcessor() relocating SMBASE
178 into a buffer in SMRAM and called SmmCpuFeaturesHookReturnFromSmm().
179 **/
180 VOID
181 EFIAPI
182 SmmCpuFeaturesSmmRelocationComplete (
183 VOID
184 )
185 {
186 }
187
188 /**
189 Return the size, in bytes, of a custom SMI Handler in bytes. If 0 is
190 returned, then a custom SMI handler is not provided by this library,
191 and the default SMI handler must be used.
192
193 @retval 0 Use the default SMI handler.
194 @retval > 0 Use the SMI handler installed by SmmCpuFeaturesInstallSmiHandler()
195 The caller is required to allocate enough SMRAM for each CPU to
196 support the size of the custom SMI handler.
197 **/
198 UINTN
199 EFIAPI
200 SmmCpuFeaturesGetSmiHandlerSize (
201 VOID
202 )
203 {
204 return 0;
205 }
206
207 /**
208 Install a custom SMI handler for the CPU specified by CpuIndex. This function
209 is only called if SmmCpuFeaturesGetSmiHandlerSize() returns a size is greater
210 than zero and is called by the CPU that was elected as monarch during System
211 Management Mode initialization.
212
213 @param[in] CpuIndex The index of the CPU to install the custom SMI handler.
214 The value must be between 0 and the NumberOfCpus field
215 in the System Management System Table (SMST).
216 @param[in] SmBase The SMBASE address for the CPU specified by CpuIndex.
217 @param[in] SmiStack The stack to use when an SMI is processed by the
218 the CPU specified by CpuIndex.
219 @param[in] StackSize The size, in bytes, if the stack used when an SMI is
220 processed by the CPU specified by CpuIndex.
221 @param[in] GdtBase The base address of the GDT to use when an SMI is
222 processed by the CPU specified by CpuIndex.
223 @param[in] GdtSize The size, in bytes, of the GDT used when an SMI is
224 processed by the CPU specified by CpuIndex.
225 @param[in] IdtBase The base address of the IDT to use when an SMI is
226 processed by the CPU specified by CpuIndex.
227 @param[in] IdtSize The size, in bytes, of the IDT used when an SMI is
228 processed by the CPU specified by CpuIndex.
229 @param[in] Cr3 The base address of the page tables to use when an SMI
230 is processed by the CPU specified by CpuIndex.
231 **/
232 VOID
233 EFIAPI
234 SmmCpuFeaturesInstallSmiHandler (
235 IN UINTN CpuIndex,
236 IN UINT32 SmBase,
237 IN VOID *SmiStack,
238 IN UINTN StackSize,
239 IN UINTN GdtBase,
240 IN UINTN GdtSize,
241 IN UINTN IdtBase,
242 IN UINTN IdtSize,
243 IN UINT32 Cr3
244 )
245 {
246 }
247
248 /**
249 Determines if MTRR registers must be configured to set SMRAM cache-ability
250 when executing in System Management Mode.
251
252 @retval TRUE MTRR registers must be configured to set SMRAM cache-ability.
253 @retval FALSE MTRR registers do not need to be configured to set SMRAM
254 cache-ability.
255 **/
256 BOOLEAN
257 EFIAPI
258 SmmCpuFeaturesNeedConfigureMtrrs (
259 VOID
260 )
261 {
262 return FALSE;
263 }
264
265 /**
266 Disable SMRR register if SMRR is supported and SmmCpuFeaturesNeedConfigureMtrrs()
267 returns TRUE.
268 **/
269 VOID
270 EFIAPI
271 SmmCpuFeaturesDisableSmrr (
272 VOID
273 )
274 {
275 //
276 // No SMRR support, nothing to do
277 //
278 }
279
280 /**
281 Enable SMRR register if SMRR is supported and SmmCpuFeaturesNeedConfigureMtrrs()
282 returns TRUE.
283 **/
284 VOID
285 EFIAPI
286 SmmCpuFeaturesReenableSmrr (
287 VOID
288 )
289 {
290 //
291 // No SMRR support, nothing to do
292 //
293 }
294
295 /**
296 Processor specific hook point each time a CPU enters System Management Mode.
297
298 @param[in] CpuIndex The index of the CPU that has entered SMM. The value
299 must be between 0 and the NumberOfCpus field in the
300 System Management System Table (SMST).
301 **/
302 VOID
303 EFIAPI
304 SmmCpuFeaturesRendezvousEntry (
305 IN UINTN CpuIndex
306 )
307 {
308 //
309 // No SMRR support, nothing to do
310 //
311 }
312
313 /**
314 Processor specific hook point each time a CPU exits System Management Mode.
315
316 @param[in] CpuIndex The index of the CPU that is exiting SMM. The value must
317 be between 0 and the NumberOfCpus field in the System
318 Management System Table (SMST).
319 **/
320 VOID
321 EFIAPI
322 SmmCpuFeaturesRendezvousExit (
323 IN UINTN CpuIndex
324 )
325 {
326 }
327
328 /**
329 Check to see if an SMM register is supported by a specified CPU.
330
331 @param[in] CpuIndex The index of the CPU to check for SMM register support.
332 The value must be between 0 and the NumberOfCpus field
333 in the System Management System Table (SMST).
334 @param[in] RegName Identifies the SMM register to check for support.
335
336 @retval TRUE The SMM register specified by RegName is supported by the CPU
337 specified by CpuIndex.
338 @retval FALSE The SMM register specified by RegName is not supported by the
339 CPU specified by CpuIndex.
340 **/
341 BOOLEAN
342 EFIAPI
343 SmmCpuFeaturesIsSmmRegisterSupported (
344 IN UINTN CpuIndex,
345 IN SMM_REG_NAME RegName
346 )
347 {
348 ASSERT (RegName == SmmRegFeatureControl);
349 return FALSE;
350 }
351
352 /**
353 Returns the current value of the SMM register for the specified CPU.
354 If the SMM register is not supported, then 0 is returned.
355
356 @param[in] CpuIndex The index of the CPU to read the SMM register. The
357 value must be between 0 and the NumberOfCpus field in
358 the System Management System Table (SMST).
359 @param[in] RegName Identifies the SMM register to read.
360
361 @return The value of the SMM register specified by RegName from the CPU
362 specified by CpuIndex.
363 **/
364 UINT64
365 EFIAPI
366 SmmCpuFeaturesGetSmmRegister (
367 IN UINTN CpuIndex,
368 IN SMM_REG_NAME RegName
369 )
370 {
371 //
372 // This is called for SmmRegSmmDelayed, SmmRegSmmBlocked, SmmRegSmmEnable.
373 // The last of these should actually be SmmRegSmmDisable, so we can just
374 // return FALSE.
375 //
376 return 0;
377 }
378
379 /**
380 Sets the value of an SMM register on a specified CPU.
381 If the SMM register is not supported, then no action is performed.
382
383 @param[in] CpuIndex The index of the CPU to write the SMM register. The
384 value must be between 0 and the NumberOfCpus field in
385 the System Management System Table (SMST).
386 @param[in] RegName Identifies the SMM register to write.
387 registers are read-only.
388 @param[in] Value The value to write to the SMM register.
389 **/
390 VOID
391 EFIAPI
392 SmmCpuFeaturesSetSmmRegister (
393 IN UINTN CpuIndex,
394 IN SMM_REG_NAME RegName,
395 IN UINT64 Value
396 )
397 {
398 ASSERT (FALSE);
399 }
400
401 ///
402 /// Macro used to simplify the lookup table entries of type CPU_SMM_SAVE_STATE_LOOKUP_ENTRY
403 ///
404 #define SMM_CPU_OFFSET(Field) OFFSET_OF (QEMU_SMRAM_SAVE_STATE_MAP, Field)
405
406 ///
407 /// Macro used to simplify the lookup table entries of type CPU_SMM_SAVE_STATE_REGISTER_RANGE
408 ///
409 #define SMM_REGISTER_RANGE(Start, End) { Start, End, End - Start + 1 }
410
411 ///
412 /// Structure used to describe a range of registers
413 ///
414 typedef struct {
415 EFI_SMM_SAVE_STATE_REGISTER Start;
416 EFI_SMM_SAVE_STATE_REGISTER End;
417 UINTN Length;
418 } CPU_SMM_SAVE_STATE_REGISTER_RANGE;
419
420 ///
421 /// Structure used to build a lookup table to retrieve the widths and offsets
422 /// associated with each supported EFI_SMM_SAVE_STATE_REGISTER value
423 ///
424
425 #define SMM_SAVE_STATE_REGISTER_FIRST_INDEX 1
426
427 typedef struct {
428 UINT8 Width32;
429 UINT8 Width64;
430 UINT16 Offset32;
431 UINT16 Offset64Lo;
432 UINT16 Offset64Hi;
433 BOOLEAN Writeable;
434 } CPU_SMM_SAVE_STATE_LOOKUP_ENTRY;
435
436 ///
437 /// Table used by GetRegisterIndex() to convert an EFI_SMM_SAVE_STATE_REGISTER
438 /// value to an index into a table of type CPU_SMM_SAVE_STATE_LOOKUP_ENTRY
439 ///
440 static CONST CPU_SMM_SAVE_STATE_REGISTER_RANGE mSmmCpuRegisterRanges[] = {
441 SMM_REGISTER_RANGE (EFI_SMM_SAVE_STATE_REGISTER_GDTBASE, EFI_SMM_SAVE_STATE_REGISTER_LDTINFO),
442 SMM_REGISTER_RANGE (EFI_SMM_SAVE_STATE_REGISTER_ES, EFI_SMM_SAVE_STATE_REGISTER_RIP),
443 SMM_REGISTER_RANGE (EFI_SMM_SAVE_STATE_REGISTER_RFLAGS, EFI_SMM_SAVE_STATE_REGISTER_CR4),
444 { (EFI_SMM_SAVE_STATE_REGISTER)0, (EFI_SMM_SAVE_STATE_REGISTER)0, 0 }
445 };
446
447 ///
448 /// Lookup table used to retrieve the widths and offsets associated with each
449 /// supported EFI_SMM_SAVE_STATE_REGISTER value
450 ///
451 static CONST CPU_SMM_SAVE_STATE_LOOKUP_ENTRY mSmmCpuWidthOffset[] = {
452 {0, 0, 0, 0, 0, FALSE}, // Reserved
453
454 //
455 // CPU Save State registers defined in PI SMM CPU Protocol.
456 //
457 {0, 8, 0 , SMM_CPU_OFFSET (x64._GDTRBase) , SMM_CPU_OFFSET (x64._GDTRBase) + 4, FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_GDTBASE = 4
458 {0, 8, 0 , SMM_CPU_OFFSET (x64._IDTRBase) , SMM_CPU_OFFSET (x64._IDTRBase) + 4, FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_IDTBASE = 5
459 {0, 8, 0 , SMM_CPU_OFFSET (x64._LDTRBase) , SMM_CPU_OFFSET (x64._LDTRBase) + 4, FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_LDTBASE = 6
460 {0, 0, 0 , SMM_CPU_OFFSET (x64._GDTRLimit), SMM_CPU_OFFSET (x64._GDTRLimit) + 4, FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_GDTLIMIT = 7
461 {0, 0, 0 , SMM_CPU_OFFSET (x64._IDTRLimit), SMM_CPU_OFFSET (x64._IDTRLimit) + 4, FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_IDTLIMIT = 8
462 {0, 0, 0 , SMM_CPU_OFFSET (x64._LDTRLimit), SMM_CPU_OFFSET (x64._LDTRLimit) + 4, FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_LDTLIMIT = 9
463 {0, 0, 0 , 0 , 0 + 4, FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_LDTINFO = 10
464
465 {4, 4, SMM_CPU_OFFSET (x86._ES) , SMM_CPU_OFFSET (x64._ES) , 0 , FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_ES = 20
466 {4, 4, SMM_CPU_OFFSET (x86._CS) , SMM_CPU_OFFSET (x64._CS) , 0 , FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_CS = 21
467 {4, 4, SMM_CPU_OFFSET (x86._SS) , SMM_CPU_OFFSET (x64._SS) , 0 , FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_SS = 22
468 {4, 4, SMM_CPU_OFFSET (x86._DS) , SMM_CPU_OFFSET (x64._DS) , 0 , FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_DS = 23
469 {4, 4, SMM_CPU_OFFSET (x86._FS) , SMM_CPU_OFFSET (x64._FS) , 0 , FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_FS = 24
470 {4, 4, SMM_CPU_OFFSET (x86._GS) , SMM_CPU_OFFSET (x64._GS) , 0 , FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_GS = 25
471 {0, 4, 0 , SMM_CPU_OFFSET (x64._LDTR) , 0 , FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_LDTR_SEL = 26
472 {4, 4, SMM_CPU_OFFSET (x86._TR) , SMM_CPU_OFFSET (x64._TR) , 0 , FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_TR_SEL = 27
473 {4, 8, SMM_CPU_OFFSET (x86._DR7) , SMM_CPU_OFFSET (x64._DR7) , SMM_CPU_OFFSET (x64._DR7) + 4, FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_DR7 = 28
474 {4, 8, SMM_CPU_OFFSET (x86._DR6) , SMM_CPU_OFFSET (x64._DR6) , SMM_CPU_OFFSET (x64._DR6) + 4, FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_DR6 = 29
475 {0, 8, 0 , SMM_CPU_OFFSET (x64._R8) , SMM_CPU_OFFSET (x64._R8) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_R8 = 30
476 {0, 8, 0 , SMM_CPU_OFFSET (x64._R9) , SMM_CPU_OFFSET (x64._R9) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_R9 = 31
477 {0, 8, 0 , SMM_CPU_OFFSET (x64._R10) , SMM_CPU_OFFSET (x64._R10) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_R10 = 32
478 {0, 8, 0 , SMM_CPU_OFFSET (x64._R11) , SMM_CPU_OFFSET (x64._R11) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_R11 = 33
479 {0, 8, 0 , SMM_CPU_OFFSET (x64._R12) , SMM_CPU_OFFSET (x64._R12) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_R12 = 34
480 {0, 8, 0 , SMM_CPU_OFFSET (x64._R13) , SMM_CPU_OFFSET (x64._R13) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_R13 = 35
481 {0, 8, 0 , SMM_CPU_OFFSET (x64._R14) , SMM_CPU_OFFSET (x64._R14) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_R14 = 36
482 {0, 8, 0 , SMM_CPU_OFFSET (x64._R15) , SMM_CPU_OFFSET (x64._R15) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_R15 = 37
483 {4, 8, SMM_CPU_OFFSET (x86._EAX) , SMM_CPU_OFFSET (x64._RAX) , SMM_CPU_OFFSET (x64._RAX) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_RAX = 38
484 {4, 8, SMM_CPU_OFFSET (x86._EBX) , SMM_CPU_OFFSET (x64._RBX) , SMM_CPU_OFFSET (x64._RBX) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_RBX = 39
485 {4, 8, SMM_CPU_OFFSET (x86._ECX) , SMM_CPU_OFFSET (x64._RCX) , SMM_CPU_OFFSET (x64._RCX) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_RCX = 40
486 {4, 8, SMM_CPU_OFFSET (x86._EDX) , SMM_CPU_OFFSET (x64._RDX) , SMM_CPU_OFFSET (x64._RDX) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_RDX = 41
487 {4, 8, SMM_CPU_OFFSET (x86._ESP) , SMM_CPU_OFFSET (x64._RSP) , SMM_CPU_OFFSET (x64._RSP) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_RSP = 42
488 {4, 8, SMM_CPU_OFFSET (x86._EBP) , SMM_CPU_OFFSET (x64._RBP) , SMM_CPU_OFFSET (x64._RBP) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_RBP = 43
489 {4, 8, SMM_CPU_OFFSET (x86._ESI) , SMM_CPU_OFFSET (x64._RSI) , SMM_CPU_OFFSET (x64._RSI) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_RSI = 44
490 {4, 8, SMM_CPU_OFFSET (x86._EDI) , SMM_CPU_OFFSET (x64._RDI) , SMM_CPU_OFFSET (x64._RDI) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_RDI = 45
491 {4, 8, SMM_CPU_OFFSET (x86._EIP) , SMM_CPU_OFFSET (x64._RIP) , SMM_CPU_OFFSET (x64._RIP) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_RIP = 46
492
493 {4, 8, SMM_CPU_OFFSET (x86._EFLAGS) , SMM_CPU_OFFSET (x64._RFLAGS) , SMM_CPU_OFFSET (x64._RFLAGS) + 4, TRUE }, // EFI_SMM_SAVE_STATE_REGISTER_RFLAGS = 51
494 {4, 8, SMM_CPU_OFFSET (x86._CR0) , SMM_CPU_OFFSET (x64._CR0) , SMM_CPU_OFFSET (x64._CR0) + 4, FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_CR0 = 52
495 {4, 8, SMM_CPU_OFFSET (x86._CR3) , SMM_CPU_OFFSET (x64._CR3) , SMM_CPU_OFFSET (x64._CR3) + 4, FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_CR3 = 53
496 {0, 4, 0 , SMM_CPU_OFFSET (x64._CR4) , SMM_CPU_OFFSET (x64._CR4) + 4, FALSE}, // EFI_SMM_SAVE_STATE_REGISTER_CR4 = 54
497 };
498
499 //
500 // No support for I/O restart
501 //
502
503 /**
504 Read information from the CPU save state.
505
506 @param Register Specifies the CPU register to read form the save state.
507
508 @retval 0 Register is not valid
509 @retval >0 Index into mSmmCpuWidthOffset[] associated with Register
510
511 **/
512 static UINTN
513 GetRegisterIndex (
514 IN EFI_SMM_SAVE_STATE_REGISTER Register
515 )
516 {
517 UINTN Index;
518 UINTN Offset;
519
520 for (Index = 0, Offset = SMM_SAVE_STATE_REGISTER_FIRST_INDEX; mSmmCpuRegisterRanges[Index].Length != 0; Index++) {
521 if (Register >= mSmmCpuRegisterRanges[Index].Start && Register <= mSmmCpuRegisterRanges[Index].End) {
522 return Register - mSmmCpuRegisterRanges[Index].Start + Offset;
523 }
524 Offset += mSmmCpuRegisterRanges[Index].Length;
525 }
526 return 0;
527 }
528
529 /**
530 Read a CPU Save State register on the target processor.
531
532 This function abstracts the differences that whether the CPU Save State register is in the
533 IA32 CPU Save State Map or X64 CPU Save State Map.
534
535 This function supports reading a CPU Save State register in SMBase relocation handler.
536
537 @param[in] CpuIndex Specifies the zero-based index of the CPU save state.
538 @param[in] RegisterIndex Index into mSmmCpuWidthOffset[] look up table.
539 @param[in] Width The number of bytes to read from the CPU save state.
540 @param[out] Buffer Upon return, this holds the CPU register value read from the save state.
541
542 @retval EFI_SUCCESS The register was read from Save State.
543 @retval EFI_NOT_FOUND The register is not defined for the Save State of Processor.
544 @retval EFI_INVALID_PARAMTER This or Buffer is NULL.
545
546 **/
547 static EFI_STATUS
548 ReadSaveStateRegisterByIndex (
549 IN UINTN CpuIndex,
550 IN UINTN RegisterIndex,
551 IN UINTN Width,
552 OUT VOID *Buffer
553 )
554 {
555 QEMU_SMRAM_SAVE_STATE_MAP *CpuSaveState;
556
557 CpuSaveState = (QEMU_SMRAM_SAVE_STATE_MAP *)gSmst->CpuSaveState[CpuIndex];
558
559 if ((CpuSaveState->x86.SMMRevId & 0xFFFF) == 0) {
560 //
561 // If 32-bit mode width is zero, then the specified register can not be accessed
562 //
563 if (mSmmCpuWidthOffset[RegisterIndex].Width32 == 0) {
564 return EFI_NOT_FOUND;
565 }
566
567 //
568 // If Width is bigger than the 32-bit mode width, then the specified register can not be accessed
569 //
570 if (Width > mSmmCpuWidthOffset[RegisterIndex].Width32) {
571 return EFI_INVALID_PARAMETER;
572 }
573
574 //
575 // Write return buffer
576 //
577 ASSERT(CpuSaveState != NULL);
578 CopyMem(Buffer, (UINT8 *)CpuSaveState + mSmmCpuWidthOffset[RegisterIndex].Offset32, Width);
579 } else {
580 //
581 // If 64-bit mode width is zero, then the specified register can not be accessed
582 //
583 if (mSmmCpuWidthOffset[RegisterIndex].Width64 == 0) {
584 return EFI_NOT_FOUND;
585 }
586
587 //
588 // If Width is bigger than the 64-bit mode width, then the specified register can not be accessed
589 //
590 if (Width > mSmmCpuWidthOffset[RegisterIndex].Width64) {
591 return EFI_INVALID_PARAMETER;
592 }
593
594 //
595 // Write lower 32-bits of return buffer
596 //
597 CopyMem(Buffer, (UINT8 *)CpuSaveState + mSmmCpuWidthOffset[RegisterIndex].Offset64Lo, MIN(4, Width));
598 if (Width >= 4) {
599 //
600 // Write upper 32-bits of return buffer
601 //
602 CopyMem((UINT8 *)Buffer + 4, (UINT8 *)CpuSaveState + mSmmCpuWidthOffset[RegisterIndex].Offset64Hi, Width - 4);
603 }
604 }
605 return EFI_SUCCESS;
606 }
607
608 /**
609 Read an SMM Save State register on the target processor. If this function
610 returns EFI_UNSUPPORTED, then the caller is responsible for reading the
611 SMM Save Sate register.
612
613 @param[in] CpuIndex The index of the CPU to read the SMM Save State. The
614 value must be between 0 and the NumberOfCpus field in
615 the System Management System Table (SMST).
616 @param[in] Register The SMM Save State register to read.
617 @param[in] Width The number of bytes to read from the CPU save state.
618 @param[out] Buffer Upon return, this holds the CPU register value read
619 from the save state.
620
621 @retval EFI_SUCCESS The register was read from Save State.
622 @retval EFI_INVALID_PARAMTER Buffer is NULL.
623 @retval EFI_UNSUPPORTED This function does not support reading Register.
624
625 **/
626 EFI_STATUS
627 EFIAPI
628 SmmCpuFeaturesReadSaveStateRegister (
629 IN UINTN CpuIndex,
630 IN EFI_SMM_SAVE_STATE_REGISTER Register,
631 IN UINTN Width,
632 OUT VOID *Buffer
633 )
634 {
635 UINTN RegisterIndex;
636 QEMU_SMRAM_SAVE_STATE_MAP *CpuSaveState;
637
638 //
639 // Check for special EFI_SMM_SAVE_STATE_REGISTER_LMA
640 //
641 if (Register == EFI_SMM_SAVE_STATE_REGISTER_LMA) {
642 //
643 // Only byte access is supported for this register
644 //
645 if (Width != 1) {
646 return EFI_INVALID_PARAMETER;
647 }
648
649 CpuSaveState = (QEMU_SMRAM_SAVE_STATE_MAP *)gSmst->CpuSaveState[CpuIndex];
650
651 //
652 // Check CPU mode
653 //
654 if ((CpuSaveState->x86.SMMRevId & 0xFFFF) == 0) {
655 *(UINT8 *)Buffer = 32;
656 } else {
657 *(UINT8 *)Buffer = 64;
658 }
659
660 return EFI_SUCCESS;
661 }
662
663 //
664 // Check for special EFI_SMM_SAVE_STATE_REGISTER_IO
665 //
666 if (Register == EFI_SMM_SAVE_STATE_REGISTER_IO) {
667 return EFI_NOT_FOUND;
668 }
669
670 //
671 // Convert Register to a register lookup table index. Let
672 // PiSmmCpuDxeSmm implement other special registers (currently
673 // there is only EFI_SMM_SAVE_STATE_REGISTER_PROCESSOR_ID).
674 //
675 RegisterIndex = GetRegisterIndex (Register);
676 if (RegisterIndex == 0) {
677 return Register < EFI_SMM_SAVE_STATE_REGISTER_IO ? EFI_NOT_FOUND : EFI_UNSUPPORTED;
678 }
679
680 return ReadSaveStateRegisterByIndex (CpuIndex, RegisterIndex, Width, Buffer);
681 }
682
683 /**
684 Writes an SMM Save State register on the target processor. If this function
685 returns EFI_UNSUPPORTED, then the caller is responsible for writing the
686 SMM Save Sate register.
687
688 @param[in] CpuIndex The index of the CPU to write the SMM Save State. The
689 value must be between 0 and the NumberOfCpus field in
690 the System Management System Table (SMST).
691 @param[in] Register The SMM Save State register to write.
692 @param[in] Width The number of bytes to write to the CPU save state.
693 @param[in] Buffer Upon entry, this holds the new CPU register value.
694
695 @retval EFI_SUCCESS The register was written to Save State.
696 @retval EFI_INVALID_PARAMTER Buffer is NULL.
697 @retval EFI_UNSUPPORTED This function does not support writing Register.
698 **/
699 EFI_STATUS
700 EFIAPI
701 SmmCpuFeaturesWriteSaveStateRegister (
702 IN UINTN CpuIndex,
703 IN EFI_SMM_SAVE_STATE_REGISTER Register,
704 IN UINTN Width,
705 IN CONST VOID *Buffer
706 )
707 {
708 UINTN RegisterIndex;
709 QEMU_SMRAM_SAVE_STATE_MAP *CpuSaveState;
710
711 //
712 // Writes to EFI_SMM_SAVE_STATE_REGISTER_LMA are ignored
713 //
714 if (Register == EFI_SMM_SAVE_STATE_REGISTER_LMA) {
715 return EFI_SUCCESS;
716 }
717
718 //
719 // Writes to EFI_SMM_SAVE_STATE_REGISTER_IO are not supported
720 //
721 if (Register == EFI_SMM_SAVE_STATE_REGISTER_IO) {
722 return EFI_NOT_FOUND;
723 }
724
725 //
726 // Convert Register to a register lookup table index. Let
727 // PiSmmCpuDxeSmm implement other special registers (currently
728 // there is only EFI_SMM_SAVE_STATE_REGISTER_PROCESSOR_ID).
729 //
730 RegisterIndex = GetRegisterIndex (Register);
731 if (RegisterIndex == 0) {
732 return Register < EFI_SMM_SAVE_STATE_REGISTER_IO ? EFI_NOT_FOUND : EFI_UNSUPPORTED;
733 }
734
735 CpuSaveState = (QEMU_SMRAM_SAVE_STATE_MAP *)gSmst->CpuSaveState[CpuIndex];
736
737 //
738 // Do not write non-writable SaveState, because it will cause exception.
739 //
740 if (!mSmmCpuWidthOffset[RegisterIndex].Writeable) {
741 return EFI_UNSUPPORTED;
742 }
743
744 //
745 // Check CPU mode
746 //
747 if ((CpuSaveState->x86.SMMRevId & 0xFFFF) == 0) {
748 //
749 // If 32-bit mode width is zero, then the specified register can not be accessed
750 //
751 if (mSmmCpuWidthOffset[RegisterIndex].Width32 == 0) {
752 return EFI_NOT_FOUND;
753 }
754
755 //
756 // If Width is bigger than the 32-bit mode width, then the specified register can not be accessed
757 //
758 if (Width > mSmmCpuWidthOffset[RegisterIndex].Width32) {
759 return EFI_INVALID_PARAMETER;
760 }
761 //
762 // Write SMM State register
763 //
764 ASSERT (CpuSaveState != NULL);
765 CopyMem((UINT8 *)CpuSaveState + mSmmCpuWidthOffset[RegisterIndex].Offset32, Buffer, Width);
766 } else {
767 //
768 // If 64-bit mode width is zero, then the specified register can not be accessed
769 //
770 if (mSmmCpuWidthOffset[RegisterIndex].Width64 == 0) {
771 return EFI_NOT_FOUND;
772 }
773
774 //
775 // If Width is bigger than the 64-bit mode width, then the specified register can not be accessed
776 //
777 if (Width > mSmmCpuWidthOffset[RegisterIndex].Width64) {
778 return EFI_INVALID_PARAMETER;
779 }
780
781 //
782 // Write lower 32-bits of SMM State register
783 //
784 CopyMem((UINT8 *)CpuSaveState + mSmmCpuWidthOffset[RegisterIndex].Offset64Lo, Buffer, MIN (4, Width));
785 if (Width >= 4) {
786 //
787 // Write upper 32-bits of SMM State register
788 //
789 CopyMem((UINT8 *)CpuSaveState + mSmmCpuWidthOffset[RegisterIndex].Offset64Hi, (UINT8 *)Buffer + 4, Width - 4);
790 }
791 }
792 return EFI_SUCCESS;
793 }
794
795 /**
796 This function is hook point called after the gEfiSmmReadyToLockProtocolGuid
797 notification is completely processed.
798 **/
799 VOID
800 EFIAPI
801 SmmCpuFeaturesCompleteSmmReadyToLock (
802 VOID
803 )
804 {
805 }
806
807 /**
808 This API provides a method for a CPU to allocate a specific region for storing page tables.
809
810 This API can be called more once to allocate memory for page tables.
811
812 Allocates the number of 4KB pages of type EfiRuntimeServicesData and returns a pointer to the
813 allocated buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL
814 is returned. If there is not enough memory remaining to satisfy the request, then NULL is
815 returned.
816
817 This function can also return NULL if there is no preference on where the page tables are allocated in SMRAM.
818
819 @param Pages The number of 4 KB pages to allocate.
820
821 @return A pointer to the allocated buffer for page tables.
822 @retval NULL Fail to allocate a specific region for storing page tables,
823 Or there is no preference on where the page tables are allocated in SMRAM.
824
825 **/
826 VOID *
827 EFIAPI
828 SmmCpuFeaturesAllocatePageTableMemory (
829 IN UINTN Pages
830 )
831 {
832 return NULL;
833 }
834
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