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
|
/** @file
Main SEC phase code. Transitions to PEI.
Copyright (c) 2008 - 2015, Intel Corporation. All rights reserved.<BR>
(C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
Copyright (c) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiPei.h>
#include <Library/PeimEntryPoint.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/PcdLib.h>
#include <Library/UefiCpuLib.h>
#include <Library/DebugAgentLib.h>
#include <Library/IoLib.h>
#include <Library/PeCoffLib.h>
#include <Library/PeCoffGetEntryPointLib.h>
#include <Library/LocalApicLib.h>
#include <Library/CpuExceptionHandlerLib.h>
#include <IndustryStandard/Tdx.h>
#include <Library/TdxHelperLib.h>
#include <Library/CcProbeLib.h>
#include <Library/PeilessStartupLib.h>
#define SEC_IDT_ENTRY_COUNT 34
typedef struct _SEC_IDT_TABLE {
EFI_PEI_SERVICES *PeiService;
IA32_IDT_GATE_DESCRIPTOR IdtTable[SEC_IDT_ENTRY_COUNT];
} SEC_IDT_TABLE;
//
// Template of an IDT entry pointing to 10:FFFFFFE4h.
//
IA32_IDT_GATE_DESCRIPTOR mIdtEntryTemplate = {
{ // Bits
0xffe4, // OffsetLow
0x10, // Selector
0x0, // Reserved_0
IA32_IDT_GATE_TYPE_INTERRUPT_32, // GateType
0xffff // OffsetHigh
}
};
VOID
EFIAPI
SecCoreStartupWithStack (
IN EFI_FIRMWARE_VOLUME_HEADER *BootFv,
IN VOID *TopOfCurrentStack
)
{
EFI_SEC_PEI_HAND_OFF SecCoreData;
SEC_IDT_TABLE IdtTableInStack;
IA32_DESCRIPTOR IdtDescriptor;
UINT32 Index;
volatile UINT8 *Table;
if (CcProbe () == CcGuestTypeIntelTdx) {
//
// From the security perspective all the external input should be measured before
// it is consumed. TdHob and Configuration FV (Cfv) image are passed from VMM
// and should be measured here.
//
if (EFI_ERROR (TdxHelperMeasureTdHob ())) {
CpuDeadLoop ();
}
if (EFI_ERROR (TdxHelperMeasureCfvImage ())) {
CpuDeadLoop ();
}
//
// For Td guests, the memory map info is in TdHobLib. It should be processed
// first so that the memory is accepted. Otherwise access to the unaccepted
// memory will trigger tripple fault.
//
if (TdxHelperProcessTdHob () != EFI_SUCCESS) {
CpuDeadLoop ();
}
}
//
// To ensure SMM can't be compromised on S3 resume, we must force re-init of
// the BaseExtractGuidedSectionLib. Since this is before library contructors
// are called, we must use a loop rather than SetMem.
//
Table = (UINT8 *)(UINTN)FixedPcdGet64 (PcdGuidedExtractHandlerTableAddress);
for (Index = 0;
Index < FixedPcdGet32 (PcdGuidedExtractHandlerTableSize);
++Index)
{
Table[Index] = 0;
}
//
// Initialize IDT - Since this is before library constructors are called,
// we use a loop rather than CopyMem.
//
IdtTableInStack.PeiService = NULL;
for (Index = 0; Index < SEC_IDT_ENTRY_COUNT; Index++) {
//
// Declare the local variables that actually move the data elements as
// volatile to prevent the optimizer from replacing this function with
// the intrinsic memcpy()
//
CONST UINT8 *Src;
volatile UINT8 *Dst;
UINTN Byte;
Src = (CONST UINT8 *)&mIdtEntryTemplate;
Dst = (volatile UINT8 *)&IdtTableInStack.IdtTable[Index];
for (Byte = 0; Byte < sizeof (mIdtEntryTemplate); Byte++) {
Dst[Byte] = Src[Byte];
}
}
IdtDescriptor.Base = (UINTN)&IdtTableInStack.IdtTable;
IdtDescriptor.Limit = (UINT16)(sizeof (IdtTableInStack.IdtTable) - 1);
ProcessLibraryConstructorList (NULL, NULL);
//
// Load the IDTR.
//
AsmWriteIdtr (&IdtDescriptor);
if (CcProbe () == CcGuestTypeIntelTdx) {
//
// InitializeCpuExceptionHandlers () should be called in Td guests so that
// #VE exceptions can be handled correctly.
//
InitializeCpuExceptionHandlers (NULL);
}
DEBUG ((
DEBUG_INFO,
"SecCoreStartupWithStack(0x%x, 0x%x)\n",
(UINT32)(UINTN)BootFv,
(UINT32)(UINTN)TopOfCurrentStack
));
//
// Initialize floating point operating environment
// to be compliant with UEFI spec.
//
InitializeFloatingPointUnits ();
//
// ASSERT that the Page Tables were set by the reset vector code to
// the address we expect.
//
ASSERT (AsmReadCr3 () == (UINTN)PcdGet32 (PcdOvmfSecPageTablesBase));
//
// |-------------| <-- TopOfCurrentStack
// | Stack | 32k
// |-------------|
// | Heap | 32k
// |-------------| <-- SecCoreData.TemporaryRamBase
//
ASSERT (
(UINTN)(PcdGet32 (PcdOvmfSecPeiTempRamBase) +
PcdGet32 (PcdOvmfSecPeiTempRamSize)) ==
(UINTN)TopOfCurrentStack
);
//
// Initialize SEC hand-off state
//
SecCoreData.DataSize = sizeof (EFI_SEC_PEI_HAND_OFF);
SecCoreData.TemporaryRamSize = (UINTN)PcdGet32 (PcdOvmfSecPeiTempRamSize);
SecCoreData.TemporaryRamBase = (VOID *)((UINT8 *)TopOfCurrentStack - SecCoreData.TemporaryRamSize);
SecCoreData.PeiTemporaryRamBase = SecCoreData.TemporaryRamBase;
SecCoreData.PeiTemporaryRamSize = SecCoreData.TemporaryRamSize >> 1;
SecCoreData.StackBase = (UINT8 *)SecCoreData.TemporaryRamBase + SecCoreData.PeiTemporaryRamSize;
SecCoreData.StackSize = SecCoreData.TemporaryRamSize >> 1;
SecCoreData.BootFirmwareVolumeBase = BootFv;
SecCoreData.BootFirmwareVolumeSize = (UINTN)BootFv->FvLength;
//
// Make sure the 8259 is masked before initializing the Debug Agent and the debug timer is enabled
//
IoWrite8 (0x21, 0xff);
IoWrite8 (0xA1, 0xff);
//
// Initialize Local APIC Timer hardware and disable Local APIC Timer
// interrupts before initializing the Debug Agent and the debug timer is
// enabled.
//
InitializeApicTimer (0, MAX_UINT32, TRUE, 5);
DisableApicTimerInterrupt ();
PeilessStartup (&SecCoreData);
ASSERT (FALSE);
CpuDeadLoop ();
}
|
