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d94e5f67 | 1 | ;------------------------------------------------------------------------------ ;\r |
2aa107c0 | 2 | ; Copyright (c) 2015 - 2022, Intel Corporation. All rights reserved.<BR>\r |
0acd8697 | 3 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
d94e5f67 JF |
4 | ;\r |
5 | ; Module Name:\r | |
6 | ;\r | |
7 | ; MpFuncs.nasm\r | |
8 | ;\r | |
9 | ; Abstract:\r | |
10 | ;\r | |
11 | ; This is the assembly code for MP support\r | |
12 | ;\r | |
13 | ;-------------------------------------------------------------------------------\r | |
14 | \r | |
15 | %include "MpEqu.inc"\r | |
16 | extern ASM_PFX(InitializeFloatingPointUnits)\r | |
17 | \r | |
e2289d19 BS |
18 | %macro OneTimeCall 1\r |
19 | jmp %1\r | |
20 | %1 %+ OneTimerCallReturn:\r | |
21 | %endmacro\r | |
22 | \r | |
23 | %macro OneTimeCallRet 1\r | |
24 | jmp %1 %+ OneTimerCallReturn\r | |
25 | %endmacro\r | |
26 | \r | |
d94e5f67 JF |
27 | DEFAULT REL\r |
28 | \r | |
29 | SECTION .text\r | |
30 | \r | |
31 | ;-------------------------------------------------------------------------------------\r | |
32 | ;RendezvousFunnelProc procedure follows. All APs execute their procedure. This\r | |
33 | ;procedure serializes all the AP processors through an Init sequence. It must be\r | |
34 | ;noted that APs arrive here very raw...ie: real mode, no stack.\r | |
35 | ;ALSO THIS PROCEDURE IS EXECUTED BY APs ONLY ON 16 BIT MODE. HENCE THIS PROC\r | |
36 | ;IS IN MACHINE CODE.\r | |
37 | ;-------------------------------------------------------------------------------------\r | |
d94e5f67 JF |
38 | RendezvousFunnelProcStart:\r |
39 | ; At this point CS = 0x(vv00) and ip= 0x0.\r | |
40 | ; Save BIST information to ebp firstly\r | |
41 | \r | |
42 | BITS 16\r | |
43 | mov ebp, eax ; Save BIST information\r | |
44 | \r | |
45 | mov ax, cs\r | |
46 | mov ds, ax\r | |
47 | mov es, ax\r | |
48 | mov ss, ax\r | |
49 | xor ax, ax\r | |
50 | mov fs, ax\r | |
51 | mov gs, ax\r | |
52 | \r | |
2fba7d4e | 53 | mov si, MP_CPU_EXCHANGE_INFO_FIELD (BufferStart)\r |
d94e5f67 JF |
54 | mov ebx, [si]\r |
55 | \r | |
2fba7d4e | 56 | mov si, MP_CPU_EXCHANGE_INFO_FIELD (DataSegment)\r |
f32bfe6d JW |
57 | mov edx, [si]\r |
58 | \r | |
59 | ;\r | |
60 | ; Get start address of 32-bit code in low memory (<1MB)\r | |
61 | ;\r | |
2fba7d4e | 62 | mov edi, MP_CPU_EXCHANGE_INFO_FIELD (ModeTransitionMemory)\r |
d94e5f67 | 63 | \r |
2fba7d4e | 64 | mov si, MP_CPU_EXCHANGE_INFO_FIELD (GdtrProfile)\r |
d94e5f67 JF |
65 | o32 lgdt [cs:si]\r |
66 | \r | |
2fba7d4e | 67 | mov si, MP_CPU_EXCHANGE_INFO_FIELD (IdtrProfile)\r |
d94e5f67 JF |
68 | o32 lidt [cs:si]\r |
69 | \r | |
f32bfe6d JW |
70 | ;\r |
71 | ; Switch to protected mode\r | |
72 | ;\r | |
73 | mov eax, cr0 ; Get control register 0\r | |
74 | or eax, 000000003h ; Set PE bit (bit #0) & MP\r | |
75 | mov cr0, eax\r | |
76 | \r | |
77 | ; Switch to 32-bit code (>1MB)\r | |
78 | o32 jmp far [cs:di]\r | |
79 | \r | |
80 | ;\r | |
81 | ; Following code must be copied to memory with type of EfiBootServicesCode.\r | |
82 | ; This is required if NX is enabled for EfiBootServicesCode of memory.\r | |
83 | ;\r | |
84 | BITS 32\r | |
85 | Flat32Start: ; protected mode entry point\r | |
86 | mov ds, dx\r | |
87 | mov es, dx\r | |
88 | mov fs, dx\r | |
89 | mov gs, dx\r | |
90 | mov ss, dx\r | |
5c66d125 JF |
91 | \r |
92 | ;\r | |
93 | ; Enable execute disable bit\r | |
94 | ;\r | |
2fba7d4e | 95 | mov esi, MP_CPU_EXCHANGE_INFO_FIELD (EnableExecuteDisable)\r |
f32bfe6d JW |
96 | cmp byte [ebx + esi], 0\r |
97 | jz SkipEnableExecuteDisableBit\r | |
98 | \r | |
5c66d125 JF |
99 | mov ecx, 0c0000080h ; EFER MSR number\r |
100 | rdmsr ; Read EFER\r | |
101 | bts eax, 11 ; Enable Execute Disable Bit\r | |
102 | wrmsr ; Write EFER\r | |
103 | \r | |
104 | SkipEnableExecuteDisableBit:\r | |
f32bfe6d JW |
105 | ;\r |
106 | ; Enable PAE\r | |
107 | ;\r | |
d94e5f67 JF |
108 | mov eax, cr4\r |
109 | bts eax, 5\r | |
09f69a87 | 110 | \r |
2fba7d4e | 111 | mov esi, MP_CPU_EXCHANGE_INFO_FIELD (Enable5LevelPaging)\r |
09f69a87 RN |
112 | cmp byte [ebx + esi], 0\r |
113 | jz SkipEnable5LevelPaging\r | |
114 | \r | |
115 | ;\r | |
116 | ; Enable 5 Level Paging\r | |
117 | ;\r | |
118 | bts eax, 12 ; Set LA57=1.\r | |
119 | \r | |
120 | SkipEnable5LevelPaging:\r | |
121 | \r | |
d94e5f67 JF |
122 | mov cr4, eax\r |
123 | \r | |
f32bfe6d JW |
124 | ;\r |
125 | ; Load page table\r | |
126 | ;\r | |
2fba7d4e | 127 | mov esi, MP_CPU_EXCHANGE_INFO_FIELD (Cr3) ; Save CR3 in ecx\r |
f32bfe6d | 128 | mov ecx, [ebx + esi]\r |
d94e5f67 JF |
129 | mov cr3, ecx ; Load CR3\r |
130 | \r | |
f32bfe6d JW |
131 | ;\r |
132 | ; Enable long mode\r | |
133 | ;\r | |
d94e5f67 JF |
134 | mov ecx, 0c0000080h ; EFER MSR number\r |
135 | rdmsr ; Read EFER\r | |
136 | bts eax, 8 ; Set LME=1\r | |
137 | wrmsr ; Write EFER\r | |
138 | \r | |
f32bfe6d JW |
139 | ;\r |
140 | ; Enable paging\r | |
141 | ;\r | |
d94e5f67 JF |
142 | mov eax, cr0 ; Read CR0\r |
143 | bts eax, 31 ; Set PG=1\r | |
144 | mov cr0, eax ; Write CR0\r | |
145 | \r | |
f32bfe6d JW |
146 | ;\r |
147 | ; Far jump to 64-bit code\r | |
148 | ;\r | |
2fba7d4e | 149 | mov edi, MP_CPU_EXCHANGE_INFO_FIELD (ModeHighMemory)\r |
f32bfe6d JW |
150 | add edi, ebx\r |
151 | jmp far [edi]\r | |
152 | \r | |
d94e5f67 | 153 | BITS 64\r |
e2289d19 | 154 | \r |
d94e5f67 | 155 | LongModeStart:\r |
845c5be1 | 156 | mov esi, ebx\r |
2fba7d4e | 157 | lea edi, [esi + MP_CPU_EXCHANGE_INFO_FIELD (InitFlag)]\r |
845c5be1 JF |
158 | cmp qword [edi], 1 ; ApInitConfig\r |
159 | jnz GetApicId\r | |
160 | \r | |
0594ec41 ED |
161 | ; Increment the number of APs executing here as early as possible\r |
162 | ; This is decremented in C code when AP is finished executing\r | |
163 | mov edi, esi\r | |
2fba7d4e | 164 | add edi, MP_CPU_EXCHANGE_INFO_FIELD (NumApsExecuting)\r |
0594ec41 ED |
165 | lock inc dword [edi]\r |
166 | \r | |
845c5be1 | 167 | ; AP init\r |
62f2cf57 | 168 | mov edi, esi\r |
2fba7d4e | 169 | add edi, MP_CPU_EXCHANGE_INFO_FIELD (ApIndex)\r |
62f2cf57 RN |
170 | mov ebx, 1\r |
171 | lock xadd dword [edi], ebx ; EBX = ApIndex++\r | |
172 | inc ebx ; EBX is CpuNumber\r | |
d94e5f67 | 173 | \r |
845c5be1 | 174 | ; program stack\r |
d94e5f67 | 175 | mov edi, esi\r |
2fba7d4e | 176 | add edi, MP_CPU_EXCHANGE_INFO_FIELD (StackSize)\r |
845c5be1 JF |
177 | mov eax, dword [edi]\r |
178 | mov ecx, ebx\r | |
179 | inc ecx\r | |
180 | mul ecx ; EAX = StackSize * (CpuNumber + 1)\r | |
d94e5f67 | 181 | mov edi, esi\r |
2fba7d4e | 182 | add edi, MP_CPU_EXCHANGE_INFO_FIELD (StackStart)\r |
d94e5f67 JF |
183 | add rax, qword [edi]\r |
184 | mov rsp, rax\r | |
7b7508ad | 185 | \r |
7b7508ad | 186 | ;\r |
e2289d19 | 187 | ; Setup the GHCB when AMD SEV-ES active.\r |
7b7508ad | 188 | ;\r |
e2289d19 | 189 | OneTimeCall SevEsSetupGhcb\r |
845c5be1 JF |
190 | jmp CProcedureInvoke\r |
191 | \r | |
192 | GetApicId:\r | |
7b7508ad | 193 | ;\r |
e2289d19 | 194 | ; Use the GHCB protocol to get the ApicId when SEV-ES is active.\r |
7b7508ad | 195 | ;\r |
e2289d19 | 196 | OneTimeCall SevEsGetApicId\r |
7b7508ad TL |
197 | \r |
198 | DoCpuid:\r | |
845c5be1 JF |
199 | mov eax, 0\r |
200 | cpuid\r | |
201 | cmp eax, 0bh\r | |
1cbd8330 LE |
202 | jb NoX2Apic ; CPUID level below CPUID_EXTENDED_TOPOLOGY\r |
203 | \r | |
204 | mov eax, 0bh\r | |
205 | xor ecx, ecx\r | |
206 | cpuid\r | |
207 | test ebx, 0ffffh\r | |
208 | jz NoX2Apic ; CPUID.0BH:EBX[15:0] is zero\r | |
209 | \r | |
210 | ; Processor is x2APIC capable; 32-bit x2APIC ID is already in EDX\r | |
211 | jmp GetProcessorNumber\r | |
212 | \r | |
213 | NoX2Apic:\r | |
845c5be1 JF |
214 | ; Processor is not x2APIC capable, so get 8-bit APIC ID\r |
215 | mov eax, 1\r | |
216 | cpuid\r | |
217 | shr ebx, 24\r | |
218 | mov edx, ebx\r | |
845c5be1 | 219 | \r |
845c5be1 JF |
220 | GetProcessorNumber:\r |
221 | ;\r | |
222 | ; Get processor number for this AP\r | |
223 | ; Note that BSP may become an AP due to SwitchBsp()\r | |
224 | ;\r | |
225 | xor ebx, ebx\r | |
2fba7d4e | 226 | lea eax, [esi + MP_CPU_EXCHANGE_INFO_FIELD (CpuInfo)]\r |
edd74ad3 | 227 | mov rdi, [eax]\r |
d94e5f67 | 228 | \r |
845c5be1 | 229 | GetNextProcNumber:\r |
2fba7d4e | 230 | cmp dword [rdi + CPU_INFO_IN_HOB.InitialApicId], edx ; APIC ID match?\r |
845c5be1 | 231 | jz ProgramStack\r |
2fba7d4e | 232 | add rdi, CPU_INFO_IN_HOB_size\r |
845c5be1 | 233 | inc ebx\r |
7367cc6c | 234 | jmp GetNextProcNumber\r |
845c5be1 JF |
235 | \r |
236 | ProgramStack:\r | |
2fba7d4e | 237 | mov rsp, qword [rdi + CPU_INFO_IN_HOB.ApTopOfStack]\r |
d94e5f67 JF |
238 | \r |
239 | CProcedureInvoke:\r | |
8396e2dd JF |
240 | push rbp ; Push BIST data at top of AP stack\r |
241 | xor rbp, rbp ; Clear ebp for call stack trace\r | |
d94e5f67 JF |
242 | push rbp\r |
243 | mov rbp, rsp\r | |
244 | \r | |
2fba7d4e | 245 | mov rax, qword [esi + MP_CPU_EXCHANGE_INFO_FIELD (InitializeFloatingPointUnits)]\r |
d94e5f67 JF |
246 | sub rsp, 20h\r |
247 | call rax ; Call assembly function to initialize FPU per UEFI spec\r | |
248 | add rsp, 20h\r | |
249 | \r | |
37676b9f | 250 | mov edx, ebx ; edx is ApIndex\r |
d94e5f67 | 251 | mov ecx, esi\r |
2fba7d4e | 252 | add ecx, MP_CPU_EXCHANGE_INFO_OFFSET ; rcx is address of exchange info data buffer\r |
d94e5f67 JF |
253 | \r |
254 | mov edi, esi\r | |
2fba7d4e | 255 | add edi, MP_CPU_EXCHANGE_INFO_FIELD (CFunction)\r |
d94e5f67 JF |
256 | mov rax, qword [edi]\r |
257 | \r | |
258 | sub rsp, 20h\r | |
8396e2dd | 259 | call rax ; Invoke C function\r |
d94e5f67 | 260 | add rsp, 20h\r |
8396e2dd | 261 | jmp $ ; Should never reach here\r |
d94e5f67 | 262 | \r |
b4d7b9d2 RN |
263 | ;\r |
264 | ; Required for the AMD SEV helper functions\r | |
265 | ;\r | |
266 | %include "AmdSev.nasm"\r | |
7b7508ad | 267 | \r |
b4d7b9d2 | 268 | RendezvousFunnelProcEnd:\r |
7b7508ad | 269 | \r |
76157021 | 270 | ;-------------------------------------------------------------------------------------\r |
20da7ca4 | 271 | ; AsmRelocateApLoop (MwaitSupport, ApTargetCState, PmCodeSegment, TopOfApStack, CountTofinish, Pm16CodeSegment, SevEsAPJumpTable, WakeupBuffer);\r |
76157021 | 272 | ;-------------------------------------------------------------------------------------\r |
76157021 | 273 | AsmRelocateApLoopStart:\r |
7b7508ad | 274 | BITS 64\r |
20da7ca4 TL |
275 | cmp qword [rsp + 56], 0 ; SevEsAPJumpTable\r |
276 | je NoSevEs\r | |
277 | \r | |
278 | ;\r | |
279 | ; Perform some SEV-ES related setup before leaving 64-bit mode\r | |
280 | ;\r | |
281 | push rcx\r | |
282 | push rdx\r | |
283 | \r | |
284 | ;\r | |
285 | ; Get the RDX reset value using CPUID\r | |
286 | ;\r | |
287 | mov rax, 1\r | |
288 | cpuid\r | |
289 | mov rsi, rax ; Save off the reset value for RDX\r | |
290 | \r | |
291 | ;\r | |
292 | ; Prepare the GHCB for the AP_HLT_LOOP VMGEXIT call\r | |
293 | ; - Must be done while in 64-bit long mode so that writes to\r | |
294 | ; the GHCB memory will be unencrypted.\r | |
295 | ; - No NAE events can be generated once this is set otherwise\r | |
296 | ; the AP_RESET_HOLD SW_EXITCODE will be overwritten.\r | |
297 | ;\r | |
298 | mov rcx, 0xc0010130\r | |
299 | rdmsr ; Retrieve current GHCB address\r | |
300 | shl rdx, 32\r | |
301 | or rdx, rax\r | |
302 | \r | |
303 | mov rdi, rdx\r | |
304 | xor rax, rax\r | |
305 | mov rcx, 0x800\r | |
306 | shr rcx, 3\r | |
307 | rep stosq ; Clear the GHCB\r | |
308 | \r | |
309 | mov rax, 0x80000004 ; VMGEXIT AP_RESET_HOLD\r | |
310 | mov [rdx + 0x390], rax\r | |
fb2a1a36 TL |
311 | mov rax, 114 ; Set SwExitCode valid bit\r |
312 | bts [rdx + 0x3f0], rax\r | |
313 | inc rax ; Set SwExitInfo1 valid bit\r | |
314 | bts [rdx + 0x3f0], rax\r | |
315 | inc rax ; Set SwExitInfo2 valid bit\r | |
316 | bts [rdx + 0x3f0], rax\r | |
20da7ca4 TL |
317 | \r |
318 | pop rdx\r | |
319 | pop rcx\r | |
320 | \r | |
321 | NoSevEs:\r | |
a7bbe9d2 | 322 | cli ; Disable interrupt before switching to 32-bit mode\r |
9f91cb01 JF |
323 | mov rax, [rsp + 40] ; CountTofinish\r |
324 | lock dec dword [rax] ; (*CountTofinish)--\r | |
76157021 | 325 | \r |
20da7ca4 TL |
326 | mov r10, [rsp + 48] ; Pm16CodeSegment\r |
327 | mov rax, [rsp + 56] ; SevEsAPJumpTable\r | |
328 | mov rbx, [rsp + 64] ; WakeupBuffer\r | |
329 | mov rsp, r9 ; TopOfApStack\r | |
330 | \r | |
331 | push rax ; Save SevEsAPJumpTable\r | |
332 | push rbx ; Save WakeupBuffer\r | |
333 | push r10 ; Save Pm16CodeSegment\r | |
334 | push rcx ; Save MwaitSupport\r | |
335 | push rdx ; Save ApTargetCState\r | |
336 | \r | |
337 | lea rax, [PmEntry] ; rax <- The start address of transition code\r | |
76157021 JF |
338 | \r |
339 | push r8\r | |
20da7ca4 TL |
340 | push rax\r |
341 | \r | |
342 | ;\r | |
343 | ; Clear R8 - R15, for reset, before going into 32-bit mode\r | |
344 | ;\r | |
345 | xor r8, r8\r | |
346 | xor r9, r9\r | |
347 | xor r10, r10\r | |
348 | xor r11, r11\r | |
349 | xor r12, r12\r | |
350 | xor r13, r13\r | |
351 | xor r14, r14\r | |
352 | xor r15, r15\r | |
353 | \r | |
354 | ;\r | |
355 | ; Far return into 32-bit mode\r | |
356 | ;\r | |
2aa107c0 | 357 | retfq\r |
20da7ca4 | 358 | \r |
76157021 JF |
359 | BITS 32\r |
360 | PmEntry:\r | |
361 | mov eax, cr0\r | |
362 | btr eax, 31 ; Clear CR0.PG\r | |
363 | mov cr0, eax ; Disable paging and caches\r | |
364 | \r | |
76157021 JF |
365 | mov ecx, 0xc0000080\r |
366 | rdmsr\r | |
367 | and ah, ~ 1 ; Clear LME\r | |
368 | wrmsr\r | |
369 | mov eax, cr4\r | |
370 | and al, ~ (1 << 5) ; Clear PAE\r | |
371 | mov cr4, eax\r | |
372 | \r | |
373 | pop edx\r | |
374 | add esp, 4\r | |
375 | pop ecx,\r | |
376 | add esp, 4\r | |
20da7ca4 TL |
377 | \r |
378 | MwaitCheck:\r | |
76157021 JF |
379 | cmp cl, 1 ; Check mwait-monitor support\r |
380 | jnz HltLoop\r | |
381 | mov ebx, edx ; Save C-State to ebx\r | |
382 | MwaitLoop:\r | |
a7bbe9d2 | 383 | cli\r |
76157021 JF |
384 | mov eax, esp ; Set Monitor Address\r |
385 | xor ecx, ecx ; ecx = 0\r | |
386 | xor edx, edx ; edx = 0\r | |
387 | monitor\r | |
76157021 | 388 | mov eax, ebx ; Mwait Cx, Target C-State per eax[7:4]\r |
f56379f3 | 389 | shl eax, 4\r |
76157021 JF |
390 | mwait\r |
391 | jmp MwaitLoop\r | |
20da7ca4 | 392 | \r |
76157021 | 393 | HltLoop:\r |
20da7ca4 TL |
394 | pop edx ; PM16CodeSegment\r |
395 | add esp, 4\r | |
396 | pop ebx ; WakeupBuffer\r | |
397 | add esp, 4\r | |
398 | pop eax ; SevEsAPJumpTable\r | |
399 | add esp, 4\r | |
400 | cmp eax, 0 ; Check for SEV-ES\r | |
401 | je DoHlt\r | |
402 | \r | |
403 | cli\r | |
404 | ;\r | |
405 | ; SEV-ES is enabled, use VMGEXIT (GHCB information already\r | |
406 | ; set by caller)\r | |
407 | ;\r | |
408 | BITS 64\r | |
409 | rep vmmcall\r | |
410 | BITS 32\r | |
411 | \r | |
412 | ;\r | |
413 | ; Back from VMGEXIT AP_HLT_LOOP\r | |
414 | ; Push the FLAGS/CS/IP values to use\r | |
415 | ;\r | |
416 | push word 0x0002 ; EFLAGS\r | |
417 | xor ecx, ecx\r | |
418 | mov cx, [eax + 2] ; CS\r | |
419 | push cx\r | |
420 | mov cx, [eax] ; IP\r | |
421 | push cx\r | |
422 | push word 0x0000 ; For alignment, will be discarded\r | |
423 | \r | |
424 | push edx\r | |
425 | push ebx\r | |
426 | \r | |
427 | mov edx, esi ; Restore RDX reset value\r | |
428 | \r | |
429 | retf\r | |
430 | \r | |
431 | DoHlt:\r | |
76157021 JF |
432 | cli\r |
433 | hlt\r | |
20da7ca4 TL |
434 | jmp DoHlt\r |
435 | \r | |
76157021 JF |
436 | BITS 64\r |
437 | AsmRelocateApLoopEnd:\r | |
438 | \r | |
d94e5f67 JF |
439 | ;-------------------------------------------------------------------------------------\r |
440 | ; AsmGetAddressMap (&AddressMap);\r | |
441 | ;-------------------------------------------------------------------------------------\r | |
442 | global ASM_PFX(AsmGetAddressMap)\r | |
443 | ASM_PFX(AsmGetAddressMap):\r | |
76323c31 | 444 | lea rax, [RendezvousFunnelProcStart]\r |
2fba7d4e RN |
445 | mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.RendezvousFunnelAddress], rax\r |
446 | mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.ModeEntryOffset], LongModeStart - RendezvousFunnelProcStart\r | |
447 | mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.RendezvousFunnelSize], RendezvousFunnelProcEnd - RendezvousFunnelProcStart\r | |
76323c31 | 448 | lea rax, [AsmRelocateApLoopStart]\r |
2fba7d4e RN |
449 | mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.RelocateApLoopFuncAddress], rax\r |
450 | mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.RelocateApLoopFuncSize], AsmRelocateApLoopEnd - AsmRelocateApLoopStart\r | |
451 | mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.ModeTransitionOffset], Flat32Start - RendezvousFunnelProcStart\r | |
2fba7d4e RN |
452 | mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.SwitchToRealNoNxOffset], SwitchToRealProcStart - Flat32Start\r |
453 | mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.SwitchToRealPM16ModeOffset], PM16Mode - RendezvousFunnelProcStart\r | |
454 | mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.SwitchToRealPM16ModeSize], SwitchToRealProcEnd - PM16Mode\r | |
d94e5f67 JF |
455 | ret\r |
456 | \r | |
457 | ;-------------------------------------------------------------------------------------\r | |
458 | ;AsmExchangeRole procedure follows. This procedure executed by current BSP, that is\r | |
8396e2dd | 459 | ;about to become an AP. It switches its stack with the current AP.\r |
d94e5f67 JF |
460 | ;AsmExchangeRole (IN CPU_EXCHANGE_INFO *MyInfo, IN CPU_EXCHANGE_INFO *OthersInfo);\r |
461 | ;-------------------------------------------------------------------------------------\r | |
462 | global ASM_PFX(AsmExchangeRole)\r | |
463 | ASM_PFX(AsmExchangeRole):\r | |
464 | ; DO NOT call other functions in this function, since 2 CPU may use 1 stack\r | |
465 | ; at the same time. If 1 CPU try to call a function, stack will be corrupted.\r | |
466 | \r | |
467 | push rax\r | |
468 | push rbx\r | |
469 | push rcx\r | |
470 | push rdx\r | |
471 | push rsi\r | |
472 | push rdi\r | |
473 | push rbp\r | |
474 | push r8\r | |
475 | push r9\r | |
476 | push r10\r | |
477 | push r11\r | |
478 | push r12\r | |
479 | push r13\r | |
480 | push r14\r | |
481 | push r15\r | |
482 | \r | |
483 | mov rax, cr0\r | |
484 | push rax\r | |
485 | \r | |
486 | mov rax, cr4\r | |
487 | push rax\r | |
488 | \r | |
489 | ; rsi contains MyInfo pointer\r | |
490 | mov rsi, rcx\r | |
491 | \r | |
492 | ; rdi contains OthersInfo pointer\r | |
493 | mov rdi, rdx\r | |
494 | \r | |
495 | ;Store EFLAGS, GDTR and IDTR regiter to stack\r | |
496 | pushfq\r | |
2fba7d4e RN |
497 | sgdt [rsi + CPU_EXCHANGE_ROLE_INFO.Gdtr]\r |
498 | sidt [rsi + CPU_EXCHANGE_ROLE_INFO.Idtr]\r | |
d94e5f67 JF |
499 | \r |
500 | ; Store the its StackPointer\r | |
2fba7d4e | 501 | mov [rsi + CPU_EXCHANGE_ROLE_INFO.StackPointer], rsp\r |
d94e5f67 JF |
502 | \r |
503 | ; update its switch state to STORED\r | |
2fba7d4e | 504 | mov byte [rsi + CPU_EXCHANGE_ROLE_INFO.State], CPU_SWITCH_STATE_STORED\r |
d94e5f67 JF |
505 | \r |
506 | WaitForOtherStored:\r | |
507 | ; wait until the other CPU finish storing its state\r | |
2fba7d4e | 508 | cmp byte [rdi + CPU_EXCHANGE_ROLE_INFO.State], CPU_SWITCH_STATE_STORED\r |
d94e5f67 JF |
509 | jz OtherStored\r |
510 | pause\r | |
511 | jmp WaitForOtherStored\r | |
512 | \r | |
513 | OtherStored:\r | |
514 | ; Since another CPU already stored its state, load them\r | |
515 | ; load GDTR value\r | |
2fba7d4e | 516 | lgdt [rdi + CPU_EXCHANGE_ROLE_INFO.Gdtr]\r |
d94e5f67 JF |
517 | \r |
518 | ; load IDTR value\r | |
2fba7d4e | 519 | lidt [rdi + CPU_EXCHANGE_ROLE_INFO.Idtr]\r |
d94e5f67 JF |
520 | \r |
521 | ; load its future StackPointer\r | |
2fba7d4e | 522 | mov rsp, [rdi + CPU_EXCHANGE_ROLE_INFO.StackPointer]\r |
d94e5f67 JF |
523 | \r |
524 | ; update the other CPU's switch state to LOADED\r | |
2fba7d4e | 525 | mov byte [rdi + CPU_EXCHANGE_ROLE_INFO.State], CPU_SWITCH_STATE_LOADED\r |
d94e5f67 JF |
526 | \r |
527 | WaitForOtherLoaded:\r | |
528 | ; wait until the other CPU finish loading new state,\r | |
529 | ; otherwise the data in stack may corrupt\r | |
2fba7d4e | 530 | cmp byte [rsi + CPU_EXCHANGE_ROLE_INFO.State], CPU_SWITCH_STATE_LOADED\r |
d94e5f67 JF |
531 | jz OtherLoaded\r |
532 | pause\r | |
533 | jmp WaitForOtherLoaded\r | |
534 | \r | |
535 | OtherLoaded:\r | |
536 | ; since the other CPU already get the data it want, leave this procedure\r | |
537 | popfq\r | |
538 | \r | |
539 | pop rax\r | |
540 | mov cr4, rax\r | |
541 | \r | |
542 | pop rax\r | |
543 | mov cr0, rax\r | |
544 | \r | |
545 | pop r15\r | |
546 | pop r14\r | |
547 | pop r13\r | |
548 | pop r12\r | |
549 | pop r11\r | |
550 | pop r10\r | |
551 | pop r9\r | |
552 | pop r8\r | |
553 | pop rbp\r | |
554 | pop rdi\r | |
555 | pop rsi\r | |
556 | pop rdx\r | |
557 | pop rcx\r | |
558 | pop rbx\r | |
559 | pop rax\r | |
560 | \r | |
561 | ret\r |