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