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
|
/*
* Copyright (C) 2011 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <string.h>
#include <errno.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/efi_utils.h>
/** @file
*
* EFI utilities
*
*/
/**
* Find end of device path
*
* @v path Path to device
* @ret path_end End of device path
*/
EFI_DEVICE_PATH_PROTOCOL * efi_devpath_end ( EFI_DEVICE_PATH_PROTOCOL *path ) {
while ( path->Type != END_DEVICE_PATH_TYPE ) {
path = ( ( ( void * ) path ) +
/* There's this amazing new-fangled thing known as
* a UINT16, but who wants to use one of those? */
( ( path->Length[1] << 8 ) | path->Length[0] ) );
}
return path;
}
/**
* Locate parent device supporting a given protocol
*
* @v device EFI device handle
* @v protocol Protocol GUID
* @v parent Parent EFI device handle to fill in
* @ret rc Return status code
*/
int efi_locate_device ( EFI_HANDLE device, EFI_GUID *protocol,
EFI_HANDLE *parent ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
union {
EFI_DEVICE_PATH_PROTOCOL *path;
void *interface;
} path;
EFI_DEVICE_PATH_PROTOCOL *devpath;
EFI_STATUS efirc;
int rc;
/* Get device path */
if ( ( efirc = bs->OpenProtocol ( device,
&efi_device_path_protocol_guid,
&path.interface,
efi_image_handle, device,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
rc = -EEFI ( efirc );
DBGC ( device, "EFIDEV %p %s cannot open device path: %s\n",
device, efi_handle_name ( device ), strerror ( rc ) );
goto err_open_device_path;
}
devpath = path.path;
/* Check for presence of specified protocol */
if ( ( efirc = bs->LocateDevicePath ( protocol, &devpath,
parent ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( device, "EFIDEV %p %s has no parent supporting %s: %s\n",
device, efi_handle_name ( device ),
efi_guid_ntoa ( protocol ), strerror ( rc ) );
goto err_locate_protocol;
}
/* Success */
rc = 0;
err_locate_protocol:
bs->CloseProtocol ( device, &efi_device_path_protocol_guid,
efi_image_handle, device );
err_open_device_path:
return rc;
}
/**
* Add EFI device as child of another EFI device
*
* @v parent EFI parent device handle
* @v child EFI child device handle
* @ret rc Return status code
*/
int efi_child_add ( EFI_HANDLE parent, EFI_HANDLE child ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
void *devpath;
EFI_STATUS efirc;
int rc;
/* Re-open the device path protocol */
if ( ( efirc = bs->OpenProtocol ( parent,
&efi_device_path_protocol_guid,
&devpath,
efi_image_handle, child,
EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( parent, "EFIDEV %p %s could not add child",
parent, efi_handle_name ( parent ) );
DBGC ( parent, " %p %s: %s\n", child,
efi_handle_name ( child ), strerror ( rc ) );
DBGC_EFI_OPENERS ( parent, parent,
&efi_device_path_protocol_guid );
return rc;
}
DBGC2 ( parent, "EFIDEV %p %s added child",
parent, efi_handle_name ( parent ) );
DBGC2 ( parent, " %p %s\n", child, efi_handle_name ( child ) );
return 0;
}
/**
* Remove EFI device as child of another EFI device
*
* @v parent EFI parent device handle
* @v child EFI child device handle
*/
void efi_child_del ( EFI_HANDLE parent, EFI_HANDLE child ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
bs->CloseProtocol ( parent, &efi_device_path_protocol_guid,
efi_image_handle, child );
DBGC2 ( parent, "EFIDEV %p %s removed child",
parent, efi_handle_name ( parent ) );
DBGC2 ( parent, " %p %s\n",
child, efi_handle_name ( child ) );
}
|
