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
|
/** @file
Debug Agent library implementition.
Copyright (c) 2010 - 2012, 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.
**/
#include "SmmDebugAgentLib.h"
DEBUG_AGENT_MAILBOX *mMailboxPointer = NULL;
DEBUG_AGENT_MAILBOX mLocalMailbox;
UINTN mSavedDebugRegisters[6];
CONST BOOLEAN MultiProcessorDebugSupport = FALSE;
/**
Read the Attach/Break-in symbols from the debug port.
@param[in] Handle Pointer to Debug Port handle.
@param[out] BreakSymbol Returned break symbol.
@retval EFI_SUCCESS Read the symbol in BreakSymbol.
@retval EFI_NOT_FOUND No read the break symbol.
**/
EFI_STATUS
DebugReadBreakSymbol (
IN DEBUG_PORT_HANDLE Handle,
OUT UINT8 *BreakSymbol
)
{
//
// Smm instance has no debug timer to poll break symbol.
//
return EFI_NOT_FOUND;
}
/**
Get Debug Agent Mailbox pointer.
@return Mailbox pointer.
**/
DEBUG_AGENT_MAILBOX *
GetMailboxPointer (
VOID
)
{
return mMailboxPointer;
}
/**
Get debug port handle.
@return Debug port handle.
**/
DEBUG_PORT_HANDLE
GetDebugPortHandle (
VOID
)
{
return (DEBUG_PORT_HANDLE) (UINTN)(mMailboxPointer->DebugPortHandle);
}
/**
Store debug register when SMI exit.
**/
VOID
SaveDebugRegister (
VOID
)
{
mSavedDebugRegisters[0] = AsmReadDr0 ();
mSavedDebugRegisters[1] = AsmReadDr1 ();
mSavedDebugRegisters[2] = AsmReadDr2 ();
mSavedDebugRegisters[3] = AsmReadDr3 ();
mSavedDebugRegisters[4] = AsmReadDr6 ();
mSavedDebugRegisters[5] = AsmReadDr7 ();
}
/**
Restore debug register when SMI exit.
**/
VOID
RestoreDebugRegister (
VOID
)
{
AsmWriteDr7 (0);
AsmWriteDr0 (mSavedDebugRegisters[0]);
AsmWriteDr1 (mSavedDebugRegisters[1]);
AsmWriteDr2 (mSavedDebugRegisters[2]);
AsmWriteDr3 (mSavedDebugRegisters[3]);
AsmWriteDr6 (mSavedDebugRegisters[4]);
AsmWriteDr7 (mSavedDebugRegisters[5]);
}
/**
Initialize debug agent.
This function is used to set up debug enviroment for source level debug
in SMM code.
If InitFlag is DEBUG_AGENT_INIT_SMM, it will overirde IDT table entries
and initialize debug port. It will get debug agent Mailbox from GUIDed HOB,
it it exists, debug agent wiil copied it into the local Mailbox in SMM space.
it will overirde IDT table entries and initialize debug port. Context will be
NULL.
If InitFlag is DEBUG_AGENT_INIT_ENTER_SMI, debug agent will save Debug
Registers and get local Mailbox in SMM space. Context will be NULL.
If InitFlag is DEBUG_AGENT_INIT_EXIT_SMI, debug agent will restore Debug
Registers. Context will be NULL.
@param[in] InitFlag Init flag is used to decide initialize process.
@param[in] Context Context needed according to InitFlag.
@param[in] Function Continue function called by debug agent library; it was
optional.
**/
VOID
EFIAPI
InitializeDebugAgent (
IN UINT32 InitFlag,
IN VOID *Context, OPTIONAL
IN DEBUG_AGENT_CONTINUE Function OPTIONAL
)
{
EFI_STATUS Status;
UINT64 DebugPortHandle;
switch (InitFlag) {
case DEBUG_AGENT_INIT_SMM:
Status = EfiGetSystemConfigurationTable (&gEfiDebugAgentGuid, (VOID **) &mMailboxPointer);
if (EFI_ERROR (Status) || mMailboxPointer == NULL) {
ZeroMem (&mLocalMailbox, sizeof (DEBUG_AGENT_MAILBOX));
mMailboxPointer = &mLocalMailbox;
}
break;
case DEBUG_AGENT_INIT_ENTER_SMI:
SaveDebugRegister ();
InitializeDebugIdt ();
if (mMailboxPointer != NULL) {
//
// Initialize debug communication port
//
DebugPortHandle = (UINT64) (UINTN)DebugPortInitialize ((DEBUG_PORT_HANDLE) (UINTN)mMailboxPointer->DebugPortHandle, NULL);
mMailboxPointer->DebugPortHandle = DebugPortHandle;
if (mMailboxPointer->DebugFlag.BreakOnNextSmi == 1) {
//
// If SMM entry break is set, SMM code will be break at here.
//
CpuBreakpoint ();
}
}
break;
case DEBUG_AGENT_INIT_EXIT_SMI:
RestoreDebugRegister ();
break;
}
}
|
