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
|
/** @file
Entry point to a EFI/DXE driver. This version is specific to QEMU, and ties
dispatch of the driver in question on the value of a QEMU fw_cfg boolean
variable which is referenced by name via a fixed pointer PCD.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2022, Google LLC. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi.h>
#include <Protocol/LoadedImage.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/QemuFwCfgSimpleParserLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiDriverEntryPoint.h>
/**
Unloads an image from memory.
This function is a callback that a driver registers to do cleanup
when the UnloadImage boot service function is called.
@param ImageHandle The handle to the image to unload.
@return Status returned by all unload().
**/
STATIC
EFI_STATUS
EFIAPI
_DriverUnloadHandler (
EFI_HANDLE ImageHandle
)
{
EFI_STATUS Status;
//
// If an UnloadImage() handler is specified, then call it
//
Status = ProcessModuleUnloadList (ImageHandle);
//
// If the driver specific unload handler does not return an error, then call
// all of the library destructors. If the unload handler returned an error,
// then the driver can not be unloaded, and the library destructors should
// not be called
//
if (!EFI_ERROR (Status)) {
ProcessLibraryDestructorList (ImageHandle, gST);
}
//
// Return the status from the driver specific unload handler
//
return Status;
}
/**
The entry point of PE/COFF Image for a DXE Driver, DXE Runtime Driver, or
UEFI Driver.
@param ImageHandle The image handle of the DXE Driver, DXE
Runtime Driver, or UEFI Driver.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The DXE Driver, DXE Runtime Driver, or
UEFI Driver exited normally.
@retval EFI_INCOMPATIBLE_VERSION _gUefiDriverRevision is greater than
SystemTable->Hdr.Revision.
@retval Other Return value from
ProcessModuleEntryPointList().
**/
EFI_STATUS
EFIAPI
_ModuleEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_LOADED_IMAGE_PROTOCOL *LoadedImage;
RETURN_STATUS RetStatus;
BOOLEAN Enabled;
if (_gUefiDriverRevision != 0) {
//
// Make sure that the EFI/UEFI spec revision of the platform is >= EFI/UEFI
// spec revision of the driver
//
if (SystemTable->Hdr.Revision < _gUefiDriverRevision) {
return EFI_INCOMPATIBLE_VERSION;
}
}
//
// Call constructor for all libraries
//
ProcessLibraryConstructorList (ImageHandle, SystemTable);
//
// Install unload handler...
//
if (_gDriverUnloadImageCount != 0) {
Status = gBS->HandleProtocol (
ImageHandle,
&gEfiLoadedImageProtocolGuid,
(VOID **)&LoadedImage
);
ASSERT_EFI_ERROR (Status);
LoadedImage->Unload = _DriverUnloadHandler;
}
RetStatus = QemuFwCfgParseBool (
FixedPcdGetPtr (PcdEntryPointOverrideFwCfgVarName),
&Enabled
);
if (!RETURN_ERROR (RetStatus) && !Enabled) {
//
// The QEMU fw_cfg variable tells us not to load this image. So abort.
//
Status = EFI_ABORTED;
} else {
//
// Call the driver entry point
//
Status = ProcessModuleEntryPointList (ImageHandle, SystemTable);
}
//
// If all of the drivers returned errors, or we if are aborting, then invoke
// all of the library destructors
//
if (EFI_ERROR (Status)) {
ProcessLibraryDestructorList (ImageHandle, SystemTable);
}
//
// Return the cumulative return status code from all of the driver entry
// points
//
return Status;
}
|
