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
|
/*
* Copyright (C) 2009 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <gpxe/pci.h>
#include <gpxe/pcibackup.h>
/** @file
*
* PCI configuration space backup and restoration
*
*/
/**
* Check PCI configuration space offset against exclusion list
*
* @v pci PCI device
* @v offset Offset within PCI configuration space
* @v exclude PCI configuration space backup exclusion list, or NULL
*/
static int
pci_backup_excluded ( struct pci_device *pci, unsigned int offset,
const uint8_t *exclude ) {
if ( ! exclude )
return 0;
for ( ; *exclude != PCI_CONFIG_BACKUP_EXCLUDE_END ; exclude++ ) {
if ( offset == *exclude ) {
DBGC ( pci, "PCI %p skipping configuration offset "
"%02x\n", pci, offset );
return 1;
}
}
return 0;
}
/**
* Back up PCI configuration space
*
* @v pci PCI device
* @v backup PCI configuration space backup
* @v exclude PCI configuration space backup exclusion list, or NULL
*/
void pci_backup ( struct pci_device *pci, struct pci_config_backup *backup,
const uint8_t *exclude ) {
unsigned int offset;
uint32_t *dword;
for ( offset = 0, dword = backup->dwords ; offset < 0x100 ;
offset += sizeof ( *dword ) , dword++ ) {
if ( ! pci_backup_excluded ( pci, offset, exclude ) )
pci_read_config_dword ( pci, offset, dword );
}
}
/**
* Restore PCI configuration space
*
* @v pci PCI device
* @v backup PCI configuration space backup
* @v exclude PCI configuration space backup exclusion list, or NULL
*/
void pci_restore ( struct pci_device *pci, struct pci_config_backup *backup,
const uint8_t *exclude ) {
unsigned int offset;
uint32_t *dword;
for ( offset = 0, dword = backup->dwords ; offset < 0x100 ;
offset += sizeof ( *dword ) , dword++ ) {
if ( ! pci_backup_excluded ( pci, offset, exclude ) )
pci_write_config_dword ( pci, offset, *dword );
}
}
|
