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1 | #------------------------------------------------------------------------------\r |
2 | #\r | |
3 | # Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>\r | |
4 | # This program and the accompanying materials\r | |
5 | # are licensed and made available under the terms and conditions of the BSD License\r | |
6 | # which accompanies this distribution. The full text of the license may be found at\r | |
7 | # http://opensource.org/licenses/bsd-license.php.\r | |
8 | #\r | |
9 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
10 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
11 | #\r | |
12 | # Module Name:\r | |
13 | #\r | |
14 | # SecEntry.S\r | |
15 | #\r | |
16 | # Abstract:\r | |
17 | #\r | |
18 | # This is the code that goes from real-mode to protected mode.\r | |
19 | # It consumes the reset vector, calls TempRamInit API from FSP binary.\r | |
20 | #\r | |
21 | #------------------------------------------------------------------------------\r | |
22 | \r | |
23 | #include "Fsp.h"\r | |
24 | \r | |
25 | ASM_GLOBAL ASM_PFX(_TEXT_REALMODE)\r | |
26 | ASM_PFX(_TEXT_REALMODE):\r | |
27 | #----------------------------------------------------------------------------\r | |
28 | #\r | |
29 | # Procedure: _ModuleEntryPoint\r | |
30 | #\r | |
31 | # Input: None\r | |
32 | #\r | |
33 | # Output: None\r | |
34 | #\r | |
35 | # Destroys: Assume all registers\r | |
36 | #\r | |
37 | # Description:\r | |
38 | #\r | |
39 | # Transition to non-paged flat-model protected mode from a\r | |
40 | # hard-coded GDT that provides exactly two descriptors.\r | |
41 | # This is a bare bones transition to protected mode only\r | |
42 | # used for a while in PEI and possibly DXE.\r | |
43 | #\r | |
44 | # After enabling protected mode, a far jump is executed to\r | |
45 | # transfer to PEI using the newly loaded GDT.\r | |
46 | #\r | |
47 | # Return: None\r | |
48 | #\r | |
49 | # MMX Usage:\r | |
50 | # MM0 = BIST State\r | |
51 | # MM5 = Save time-stamp counter value high32bit\r | |
52 | # MM6 = Save time-stamp counter value low32bit.\r | |
53 | #\r | |
54 | #----------------------------------------------------------------------------\r | |
55 | \r | |
56 | .align 4\r | |
57 | ASM_GLOBAL ASM_PFX(_ModuleEntryPoint)\r | |
58 | ASM_PFX(_ModuleEntryPoint):\r | |
59 | fninit # clear any pending Floating point exceptions\r | |
60 | #\r | |
61 | # Store the BIST value in mm0\r | |
62 | #\r | |
63 | movd %eax, %mm0\r | |
64 | \r | |
65 | #\r | |
66 | # Save time-stamp counter value\r | |
67 | # rdtsc load 64bit time-stamp counter to EDX:EAX\r | |
68 | #\r | |
69 | rdtsc\r | |
70 | movd %edx, %mm5\r | |
71 | movd %ecx, %mm6\r | |
72 | \r | |
73 | #\r | |
74 | # Load the GDT table in GdtDesc\r | |
75 | #\r | |
76 | movl $GdtDesc, %esi\r | |
77 | .byte 0x66\r | |
78 | lgdt %cs:(%si)\r | |
79 | \r | |
80 | #\r | |
81 | # Transition to 16 bit protected mode\r | |
82 | #\r | |
83 | movl %cr0, %eax # Get control register 0\r | |
84 | orl $0x00000003, %eax # Set PE bit (bit #0) & MP bit (bit #1)\r | |
85 | movl %eax, %cr0 # Activate protected mode\r | |
86 | \r | |
87 | movl %cr4, %eax # Get control register 4\r | |
88 | orl $0x00000600, %eax # Set OSFXSR bit (bit #9) & OSXMMEXCPT bit (bit #10)\r | |
89 | movl %eax, %cr4\r | |
90 | \r | |
91 | #\r | |
92 | # Now we're in 16 bit protected mode\r | |
93 | # Set up the selectors for 32 bit protected mode entry\r | |
94 | #\r | |
95 | movw SYS_DATA_SEL, %ax\r | |
96 | movw %ax, %ds\r | |
97 | movw %ax, %es\r | |
98 | movw %ax, %fs\r | |
99 | movw %ax, %gs\r | |
100 | movw %ax, %ss\r | |
101 | \r | |
102 | #\r | |
103 | # Transition to Flat 32 bit protected mode\r | |
104 | # The jump to a far pointer causes the transition to 32 bit mode\r | |
105 | #\r | |
106 | movl $ProtectedModeEntryLinearAddress, %esi\r | |
107 | jmp *%cs:(%si)\r | |
108 | \r | |
109 | ASM_GLOBAL ASM_PFX(_TEXT_PROTECTED_MODE)\r | |
110 | ASM_PFX(_TEXT_PROTECTED_MODE):\r | |
111 | \r | |
112 | #----------------------------------------------------------------------------\r | |
113 | #\r | |
114 | # Procedure: ProtectedModeEntryPoint\r | |
115 | #\r | |
116 | # Input: None\r | |
117 | #\r | |
118 | # Output: None\r | |
119 | #\r | |
120 | # Destroys: Assume all registers\r | |
121 | #\r | |
122 | # Description:\r | |
123 | #\r | |
124 | # This function handles:\r | |
125 | # Call two basic APIs from FSP binary\r | |
126 | # Initializes stack with some early data (BIST, PEI entry, etc)\r | |
127 | #\r | |
128 | # Return: None\r | |
129 | #\r | |
130 | #----------------------------------------------------------------------------\r | |
131 | \r | |
132 | .align 4\r | |
133 | ASM_GLOBAL ASM_PFX(ProtectedModeEntryPoint)\r | |
134 | ASM_PFX(ProtectedModeEntryPoint):\r | |
135 | \r | |
136 | # Find the fsp info header\r | |
137 | movl PcdGet32 (PcdFlashFvFspBase), %edi\r | |
138 | movl PcdGet32 (PcdFlashFvFspSize), %ecx\r | |
139 | \r | |
140 | movl FVH_SIGINATURE_OFFSET(%edi), %eax\r | |
141 | cmp $FVH_SIGINATURE_VALID_VALUE, %eax\r | |
142 | jnz FspHeaderNotFound\r | |
143 | \r | |
144 | xorl %eax, %eax\r | |
145 | movw FVH_EXTHEADER_OFFSET_OFFSET(%edi), %ax\r | |
146 | cmp %ax, 0\r | |
147 | jnz FspFvExtHeaderExist\r | |
148 | \r | |
149 | xorl %eax, %eax\r | |
150 | movw FVH_HEADER_LENGTH_OFFSET(%edi), %ax # Bypass Fv Header\r | |
151 | addl %eax, %edi\r | |
152 | jmp FspCheckFfsHeader\r | |
153 | \r | |
154 | FspFvExtHeaderExist:\r | |
155 | addl %eax, %edi\r | |
156 | movl FVH_EXTHEADER_SIZE_OFFSET(%edi), %eax # Bypass Ext Fv Header\r | |
157 | addl %eax, %edi\r | |
158 | \r | |
159 | # Round up to 8 byte alignment\r | |
160 | movl %edi, %eax\r | |
161 | andb $0x07, %al\r | |
162 | jz FspCheckFfsHeader\r | |
163 | \r | |
164 | and $0xFFFFFFF8, %edi\r | |
165 | add $0x08, %edi\r | |
166 | \r | |
167 | FspCheckFfsHeader:\r | |
168 | # Check the ffs guid\r | |
169 | movl (%edi), %eax\r | |
170 | cmp $FSP_HEADER_GUID_DWORD1, %eax\r | |
171 | jnz FspHeaderNotFound\r | |
172 | \r | |
173 | movl 0x4(%edi), %eax\r | |
174 | cmp $FSP_HEADER_GUID_DWORD2, %eax\r | |
175 | jnz FspHeaderNotFound\r | |
176 | \r | |
177 | movl 0x08(%edi), %eax\r | |
178 | cmp $FSP_HEADER_GUID_DWORD3, %eax\r | |
179 | jnz FspHeaderNotFound\r | |
180 | \r | |
181 | movl 0x0c(%edi), %eax\r | |
182 | cmp $FSP_HEADER_GUID_DWORD4, %eax\r | |
183 | jnz FspHeaderNotFound\r | |
184 | \r | |
185 | add $FFS_HEADER_SIZE_VALUE, %edi # Bypass the ffs header\r | |
186 | \r | |
187 | # Check the section type as raw section\r | |
188 | movb SECTION_HEADER_TYPE_OFFSET(%edi), %al\r | |
189 | cmp $0x19, %al\r | |
190 | jnz FspHeaderNotFound\r | |
191 | \r | |
192 | addl $RAW_SECTION_HEADER_SIZE_VALUE, %edi # Bypass the section header\r | |
193 | jmp FspHeaderFound\r | |
194 | \r | |
195 | FspHeaderNotFound:\r | |
196 | jmp .\r | |
197 | \r | |
198 | FspHeaderFound:\r | |
199 | # Get the fsp TempRamInit Api address\r | |
200 | movl FSP_HEADER_IMAGEBASE_OFFSET(%edi), %eax\r | |
201 | addl FSP_HEADER_TEMPRAMINIT_OFFSET(%edi), %eax\r | |
202 | \r | |
203 | # Setup the hardcode stack\r | |
204 | movl $TempRamInitStack, %esp\r | |
205 | \r | |
206 | # Call the fsp TempRamInit Api\r | |
207 | jmp *%eax\r | |
208 | \r | |
209 | TempRamInitDone:\r | |
210 | cmp $0x0, %eax\r | |
211 | jnz FspApiFailed\r | |
212 | \r | |
213 | # ECX: start of range\r | |
214 | # EDX: end of range\r | |
215 | movl %edx, %esp\r | |
216 | pushl %edx\r | |
217 | pushl %ecx\r | |
218 | pushl %eax # zero - no hob list yet\r | |
219 | call ASM_PFX(CallPeiCoreEntryPoint)\r | |
220 | \r | |
221 | FspApiFailed:\r | |
222 | jmp .\r | |
223 | \r | |
224 | .align 0x10\r | |
225 | TempRamInitStack:\r | |
226 | .long TempRamInitDone\r | |
227 | .long TempRamInitParams\r | |
228 | \r | |
229 | #\r | |
230 | # ROM-based Global-Descriptor Table for the Tiano PEI Phase\r | |
231 | #\r | |
232 | .align 16\r | |
233 | \r | |
234 | #\r | |
235 | # GDT[0]: 0x00: Null entry, never used.\r | |
236 | #\r | |
237 | .equ NULL_SEL, . - GDT_BASE # Selector [0]\r | |
238 | GDT_BASE:\r | |
239 | BootGdtTable: .long 0\r | |
240 | .long 0\r | |
241 | #\r | |
242 | # Linear data segment descriptor\r | |
243 | #\r | |
244 | .equ LINEAR_SEL, . - GDT_BASE # Selector [0x8]\r | |
245 | .word 0xFFFF # limit 0xFFFFF\r | |
246 | .word 0 # base 0\r | |
247 | .byte 0\r | |
248 | .byte 0x92 # present, ring 0, data, expand-up, writable\r | |
249 | .byte 0xCF # page-granular, 32-bit\r | |
250 | .byte 0\r | |
251 | #\r | |
252 | # Linear code segment descriptor\r | |
253 | #\r | |
254 | .equ LINEAR_CODE_SEL, . - GDT_BASE # Selector [0x10]\r | |
255 | .word 0xFFFF # limit 0xFFFFF\r | |
256 | .word 0 # base 0\r | |
257 | .byte 0\r | |
258 | .byte 0x9B # present, ring 0, data, expand-up, not-writable\r | |
259 | .byte 0xCF # page-granular, 32-bit\r | |
260 | .byte 0\r | |
261 | #\r | |
262 | # System data segment descriptor\r | |
263 | #\r | |
264 | .equ SYS_DATA_SEL, . - GDT_BASE # Selector [0x18]\r | |
265 | .word 0xFFFF # limit 0xFFFFF\r | |
266 | .word 0 # base 0\r | |
267 | .byte 0\r | |
268 | .byte 0x93 # present, ring 0, data, expand-up, not-writable\r | |
269 | .byte 0xCF # page-granular, 32-bit\r | |
270 | .byte 0\r | |
271 | \r | |
272 | #\r | |
273 | # System code segment descriptor\r | |
274 | #\r | |
275 | .equ SYS_CODE_SEL, . - GDT_BASE # Selector [0x20]\r | |
276 | .word 0xFFFF # limit 0xFFFFF\r | |
277 | .word 0 # base 0\r | |
278 | .byte 0\r | |
279 | .byte 0x9A # present, ring 0, data, expand-up, writable\r | |
280 | .byte 0xCF # page-granular, 32-bit\r | |
281 | .byte 0\r | |
282 | #\r | |
283 | # Spare segment descriptor\r | |
284 | #\r | |
285 | .equ SYS16_CODE_SEL, . - GDT_BASE # Selector [0x28]\r | |
286 | .word 0xFFFF # limit 0xFFFFF\r | |
287 | .word 0 # base 0\r | |
288 | .byte 0x0E # Changed from F000 to E000.\r | |
289 | .byte 0x9B # present, ring 0, code, expand-up, writable\r | |
290 | .byte 0x00 # byte-granular, 16-bit\r | |
291 | .byte 0\r | |
292 | #\r | |
293 | # Spare segment descriptor\r | |
294 | #\r | |
295 | .equ SYS16_DATA_SEL, . - GDT_BASE # Selector [0x30]\r | |
296 | .word 0xFFFF # limit 0xFFFF\r | |
297 | .word 0 # base 0\r | |
298 | .byte 0\r | |
299 | .byte 0x93 # present, ring 0, data, expand-up, not-writable\r | |
300 | .byte 0x00 # byte-granular, 16-bit\r | |
301 | .byte 0\r | |
302 | \r | |
303 | #\r | |
304 | # Spare segment descriptor\r | |
305 | #\r | |
306 | .equ SPARE5_SEL, . - GDT_BASE # Selector [0x38]\r | |
307 | .word 0 # limit 0\r | |
308 | .word 0 # base 0\r | |
309 | .byte 0\r | |
310 | .byte 0 # present, ring 0, data, expand-up, writable\r | |
311 | .byte 0 # page-granular, 32-bit\r | |
312 | .byte 0\r | |
313 | .equ GDT_SIZE, . - BootGdtTable # Size, in bytes\r | |
314 | \r | |
315 | #\r | |
316 | # GDT Descriptor\r | |
317 | #\r | |
318 | GdtDesc: # GDT descriptor\r | |
319 | .word GDT_SIZE - 1 # GDT limit\r | |
320 | .long BootGdtTable # GDT base address\r | |
321 | \r | |
322 | ASM_PFX(ProtectedModeEntryLinearAddress):\r | |
323 | ProtectedModeEntryLinearOffset:\r | |
324 | .long ProtectedModeEntryPoint # Offset of our 32 bit code\r | |
325 | .word LINEAR_CODE_SEL\r |