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1 | ;------------------------------------------------------------------------------ ; |
2 | ; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR> | |
3 | ; This program and the accompanying materials | |
4 | ; are licensed and made available under the terms and conditions of the BSD License | |
5 | ; which accompanies this distribution. The full text of the license may be found at | |
6 | ; http://opensource.org/licenses/bsd-license.php. | |
7 | ; | |
8 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
9 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
10 | ; | |
11 | ; Module Name: | |
12 | ; | |
13 | ; MpFuncs32.asm | |
14 | ; | |
15 | ; Abstract: | |
16 | ; | |
17 | ; This is the assembly code for MP support | |
18 | ; | |
19 | ;------------------------------------------------------------------------------- | |
20 | ||
21 | include MpEqu.inc | |
46ba0f63 JF |
22 | extern InitializeFloatingPointUnits:PROC |
23 | ||
f9d30595 | 24 | .code |
34ff8715 JF |
25 | ;------------------------------------------------------------------------------------- |
26 | ;RendezvousFunnelProc procedure follows. All APs execute their procedure. This | |
27 | ;procedure serializes all the AP processors through an Init sequence. It must be | |
28 | ;noted that APs arrive here very raw...ie: real mode, no stack. | |
29 | ;ALSO THIS PROCEDURE IS EXECUTED BY APs ONLY ON 16 BIT MODE. HENCE THIS PROC | |
30 | ;IS IN MACHINE CODE. | |
31 | ;------------------------------------------------------------------------------------- | |
32 | RendezvousFunnelProc PROC PUBLIC | |
33 | RendezvousFunnelProcStart:: | |
34 | ; At this point CS = 0x(vv00) and ip= 0x0. | |
35 | ; Save BIST information to ebp firstly | |
36 | db 66h, 08bh, 0e8h ; mov ebp, eax ; save BIST information | |
37 | ||
38 | db 8ch,0c8h ; mov ax,cs | |
39 | db 8eh,0d8h ; mov ds,ax | |
40 | db 8eh,0c0h ; mov es,ax | |
41 | db 8eh,0d0h ; mov ss,ax | |
42 | db 33h,0c0h ; xor ax,ax | |
43 | db 8eh,0e0h ; mov fs,ax | |
44 | db 8eh,0e8h ; mov gs,ax | |
45 | ||
46 | db 0BEh ; opcode of mov si, mem16 | |
47 | dw BufferStartLocation ; mov si, BufferStartLocation | |
48 | db 66h, 8Bh, 1Ch ; mov ebx,dword ptr [si] | |
49 | ||
50 | db 0BFh ; opcode of mov di, mem16 | |
51 | dw PmodeOffsetLocation ; mov di, PmodeOffsetLocation | |
52 | db 66h, 8Bh, 05h ; mov eax,dword ptr [di] | |
53 | db 8Bh, 0F8h ; mov di, ax | |
54 | db 83h, 0EFh,06h ; sub di, 06h | |
55 | db 66h, 03h, 0C3h ; add eax, ebx | |
56 | db 66h, 89h, 05h ; mov dword ptr [di],eax | |
57 | ||
58 | db 0BFh ; opcode of mov di, mem16 | |
59 | dw LmodeOffsetLocation ; mov di, LmodeOffsetLocation | |
60 | db 66h, 8Bh, 05h ; mov eax,dword ptr [di] | |
61 | db 8Bh, 0F8h ; mov di, ax | |
62 | db 83h, 0EFh,06h ; sub di, 06h | |
63 | db 66h, 03h, 0C3h ; add eax, ebx | |
64 | db 66h, 89h, 05h ; mov dword ptr [di],eax | |
65 | ||
66 | db 0BEh | |
67 | dw Cr3Location ; mov si, Cr3Location | |
68 | db 66h, 8Bh, 0Ch ; mov ecx,dword ptr [si] ; ECX is keeping the value of CR3 | |
69 | ||
70 | db 0BEh ; opcode of mov si, mem16 | |
71 | dw GdtrLocation ; mov si, GdtrLocation | |
72 | db 66h ; db 66h | |
73 | db 2Eh, 0Fh, 01h, 14h ; lgdt fword ptr cs:[si] | |
74 | ||
75 | db 0BEh | |
76 | dw IdtrLocation ; mov si, IdtrLocation | |
77 | db 66h ; db 66h | |
78 | db 2Eh,0Fh, 01h, 1Ch ; lidt fword ptr cs:[si] | |
79 | ||
80 | db 33h, 0C0h ; xor ax, ax | |
81 | db 8Eh, 0D8h ; mov ds, ax | |
82 | ||
83 | db 0Fh, 20h, 0C0h ; mov eax, cr0 ;Get control register 0 | |
84 | db 66h, 83h, 0C8h, 03h ; or eax, 000000003h ;Set PE bit (bit #0) & MP | |
85 | db 0Fh, 22h, 0C0h ; mov cr0, eax | |
86 | ||
87 | db 66h, 67h, 0EAh ; far jump | |
88 | dd 0h ; 32-bit offset | |
89 | dw PROTECT_MODE_CS ; 16-bit selector | |
90 | ||
91 | Flat32Start:: ; protected mode entry point | |
92 | mov ax, PROTECT_MODE_DS | |
93 | mov ds, ax | |
94 | mov es, ax | |
95 | mov fs, ax | |
96 | mov gs, ax | |
97 | mov ss, ax | |
98 | ||
99 | db 0Fh, 20h, 0E0h ; mov eax, cr4 | |
100 | db 0Fh, 0BAh, 0E8h, 05h ; bts eax, 5 | |
101 | db 0Fh, 22h, 0E0h ; mov cr4, eax | |
102 | ||
103 | db 0Fh, 22h, 0D9h ; mov cr3, ecx | |
104 | ||
105 | db 0B9h | |
106 | dd 0C0000080h ; mov ecx, 0c0000080h ; EFER MSR number. | |
107 | db 0Fh, 32h ; rdmsr ; Read EFER. | |
108 | db 0Fh, 0BAh, 0E8h, 08h ; bts eax, 8 ; Set LME=1. | |
109 | db 0Fh, 30h ; wrmsr ; Write EFER. | |
110 | ||
111 | db 0Fh, 20h, 0C0h ; mov eax, cr0 ; Read CR0. | |
112 | db 0Fh, 0BAh, 0E8h, 1Fh ; bts eax, 31 ; Set PG=1. | |
113 | db 0Fh, 22h, 0C0h ; mov cr0, eax ; Write CR0. | |
114 | ||
115 | LONG_JUMP: | |
116 | db 67h, 0EAh ; far jump | |
117 | dd 0h ; 32-bit offset | |
118 | dw LONG_MODE_CS ; 16-bit selector | |
119 | ||
120 | LongModeStart:: | |
121 | mov ax, LONG_MODE_DS | |
122 | mov ds, ax | |
123 | mov es, ax | |
124 | mov ss, ax | |
125 | ||
126 | mov esi, ebx | |
127 | mov edi, esi | |
128 | add edi, LockLocation | |
129 | mov rax, NotVacantFlag | |
130 | ||
131 | TestLock: | |
132 | xchg qword ptr [edi], rax | |
133 | cmp rax, NotVacantFlag | |
134 | jz TestLock | |
135 | ||
136 | mov edi, esi | |
137 | add edi, NumApsExecutingLoction | |
138 | inc dword ptr [edi] | |
139 | mov ebx, dword ptr [edi] | |
140 | ||
141 | ProgramStack: | |
142 | mov edi, esi | |
143 | add edi, StackSizeLocation | |
144 | mov rax, qword ptr [edi] | |
145 | mov edi, esi | |
146 | add edi, StackStartAddressLocation | |
147 | add rax, qword ptr [edi] | |
148 | mov rsp, rax | |
149 | mov qword ptr [edi], rax | |
150 | ||
151 | Releaselock: | |
152 | mov rax, VacantFlag | |
153 | mov edi, esi | |
154 | add edi, LockLocation | |
155 | xchg qword ptr [edi], rax | |
156 | ||
157 | CProcedureInvoke: | |
158 | push rbp ; push BIST data | |
159 | xor rbp, rbp ; clear ebp for call stack trace | |
160 | push rbp | |
161 | mov rbp, rsp | |
162 | ||
46ba0f63 JF |
163 | mov rax, InitializeFloatingPointUnits |
164 | sub rsp, 20h | |
165 | call rax ; Call assembly function to initialize FPU per UEFI spec | |
166 | add rsp, 20h | |
34ff8715 JF |
167 | |
168 | mov edx, ebx ; edx is NumApsExecuting | |
169 | mov ecx, esi | |
170 | add ecx, LockLocation ; rcx is address of exchange info data buffer | |
171 | ||
172 | mov edi, esi | |
173 | add edi, ApProcedureLocation | |
174 | mov rax, qword ptr [edi] | |
175 | ||
176 | sub rsp, 20h | |
177 | call rax ; invoke C function | |
178 | add rsp, 20h | |
179 | jmp $ | |
180 | ||
181 | RendezvousFunnelProc ENDP | |
182 | RendezvousFunnelProcEnd:: | |
f9d30595 | 183 | |
fcc82734 JF |
184 | AsmCliHltLoop PROC |
185 | cli | |
186 | hlt | |
187 | jmp $-2 | |
188 | AsmCliHltLoop ENDP | |
189 | ||
8018cb15 JF |
190 | ;------------------------------------------------------------------------------------- |
191 | ; AsmGetAddressMap (&AddressMap); | |
192 | ;------------------------------------------------------------------------------------- | |
193 | AsmGetAddressMap PROC | |
194 | mov rax, offset RendezvousFunnelProcStart | |
195 | mov qword ptr [rcx], rax | |
196 | mov qword ptr [rcx + 8h], Flat32Start - RendezvousFunnelProcStart | |
197 | mov qword ptr [rcx + 10h], LongModeStart - RendezvousFunnelProcStart | |
198 | mov qword ptr [rcx + 18h], RendezvousFunnelProcEnd - RendezvousFunnelProcStart | |
199 | ret | |
200 | AsmGetAddressMap ENDP | |
f9d30595 | 201 | |
3798f351 JF |
202 | ;------------------------------------------------------------------------------------- |
203 | ;AsmExchangeRole procedure follows. This procedure executed by current BSP, that is | |
204 | ;about to become an AP. It switches it'stack with the current AP. | |
205 | ;AsmExchangeRole (IN CPU_EXCHANGE_INFO *MyInfo, IN CPU_EXCHANGE_INFO *OthersInfo); | |
206 | ;------------------------------------------------------------------------------------- | |
207 | AsmExchangeRole PROC | |
208 | ; DO NOT call other functions in this function, since 2 CPU may use 1 stack | |
209 | ; at the same time. If 1 CPU try to call a function, stack will be corrupted. | |
210 | ||
211 | push rax | |
212 | push rbx | |
213 | push rcx | |
214 | push rdx | |
215 | push rsi | |
216 | push rdi | |
217 | push rbp | |
218 | push r8 | |
219 | push r9 | |
220 | push r10 | |
221 | push r11 | |
222 | push r12 | |
223 | push r13 | |
224 | push r14 | |
225 | push r15 | |
226 | ||
227 | mov rax, cr0 | |
228 | push rax | |
229 | ||
230 | mov rax, cr4 | |
231 | push rax | |
232 | ||
233 | ; rsi contains MyInfo pointer | |
234 | mov rsi, rcx | |
235 | ||
236 | ; rdi contains OthersInfo pointer | |
237 | mov rdi, rdx | |
238 | ||
239 | ;Store EFLAGS, GDTR and IDTR regiter to stack | |
240 | pushfq | |
241 | sgdt fword ptr [rsi + 16] | |
242 | sidt fword ptr [rsi + 26] | |
243 | ||
244 | ; Store the its StackPointer | |
245 | mov qword ptr [rsi + 8], rsp | |
246 | ||
247 | ; update its switch state to STORED | |
248 | mov byte ptr [rsi], CPU_SWITCH_STATE_STORED | |
249 | ||
250 | WaitForOtherStored: | |
251 | ; wait until the other CPU finish storing its state | |
252 | cmp byte ptr [rdi], CPU_SWITCH_STATE_STORED | |
253 | jz OtherStored | |
254 | pause | |
255 | jmp WaitForOtherStored | |
256 | ||
257 | OtherStored: | |
258 | ; Since another CPU already stored its state, load them | |
259 | ; load GDTR value | |
260 | lgdt fword ptr [rdi + 16] | |
261 | ||
262 | ; load IDTR value | |
263 | lidt fword ptr [rdi + 26] | |
264 | ||
265 | ; load its future StackPointer | |
266 | mov rsp, qword ptr [rdi + 8] | |
267 | ||
268 | ; update the other CPU's switch state to LOADED | |
269 | mov byte ptr [rdi], CPU_SWITCH_STATE_LOADED | |
270 | ||
271 | WaitForOtherLoaded: | |
272 | ; wait until the other CPU finish loading new state, | |
273 | ; otherwise the data in stack may corrupt | |
274 | cmp byte ptr [rsi], CPU_SWITCH_STATE_LOADED | |
275 | jz OtherLoaded | |
276 | pause | |
277 | jmp WaitForOtherLoaded | |
278 | ||
279 | OtherLoaded: | |
280 | ; since the other CPU already get the data it want, leave this procedure | |
281 | popfq | |
282 | ||
283 | pop rax | |
284 | mov cr4, rax | |
285 | ||
286 | pop rax | |
287 | mov cr0, rax | |
288 | ||
289 | pop r15 | |
290 | pop r14 | |
291 | pop r13 | |
292 | pop r12 | |
293 | pop r11 | |
294 | pop r10 | |
295 | pop r9 | |
296 | pop r8 | |
297 | pop rbp | |
298 | pop rdi | |
299 | pop rsi | |
300 | pop rdx | |
301 | pop rcx | |
302 | pop rbx | |
303 | pop rax | |
304 | ||
305 | ret | |
306 | AsmExchangeRole ENDP | |
307 | ||
f9d30595 JF |
308 | AsmInitializeGdt PROC |
309 | push rbp | |
310 | mov rbp, rsp | |
311 | ||
312 | lgdt fword PTR [rcx] ; update the GDTR | |
313 | ||
314 | sub rsp, 0x10 | |
315 | lea rax, SetCodeSelectorFarJump | |
316 | mov [rsp], rax | |
317 | mov rdx, LONG_MODE_CS | |
318 | mov [rsp + 4], dx ; get new CS | |
319 | jmp fword ptr [rsp] | |
320 | SetCodeSelectorFarJump: | |
321 | add rsp, 0x10 | |
322 | ||
323 | mov rax, LONG_MODE_DS ; get new DS | |
324 | mov ds, ax | |
325 | mov es, ax | |
326 | mov fs, ax | |
327 | mov gs, ax | |
328 | mov ss, ax | |
329 | ||
330 | pop rbp | |
331 | ret | |
332 | AsmInitializeGdt ENDP | |
333 | ||
334 | END |