1 /*
2 * Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19 FILE_LICENCE ( GPL2_OR_LATER );
20
21 #include <stdint.h>
22 #include <gpxe/pci.h>
23 #include <gpxe/pcibackup.h>
24
25 /** @file
26 *
27 * PCI configuration space backup and restoration
28 *
29 */
30
31 /**
32 * Check PCI configuration space offset against exclusion list
33 *
34 * @v pci PCI device
35 * @v offset Offset within PCI configuration space
36 * @v exclude PCI configuration space backup exclusion list, or NULL
37 */
38 static int
pci_backup_excluded(struct pci_device * pci,unsigned int offset,const uint8_t * exclude)39 pci_backup_excluded ( struct pci_device *pci, unsigned int offset,
40 const uint8_t *exclude ) {
41
42 if ( ! exclude )
43 return 0;
44 for ( ; *exclude != PCI_CONFIG_BACKUP_EXCLUDE_END ; exclude++ ) {
45 if ( offset == *exclude ) {
46 DBGC ( pci, "PCI %p skipping configuration offset "
47 "%02x\n", pci, offset );
48 return 1;
49 }
50 }
51 return 0;
52 }
53
54 /**
55 * Back up PCI configuration space
56 *
57 * @v pci PCI device
58 * @v backup PCI configuration space backup
59 * @v exclude PCI configuration space backup exclusion list, or NULL
60 */
pci_backup(struct pci_device * pci,struct pci_config_backup * backup,const uint8_t * exclude)61 void pci_backup ( struct pci_device *pci, struct pci_config_backup *backup,
62 const uint8_t *exclude ) {
63 unsigned int offset;
64 uint32_t *dword;
65
66 for ( offset = 0, dword = backup->dwords ; offset < 0x100 ;
67 offset += sizeof ( *dword ) , dword++ ) {
68 if ( ! pci_backup_excluded ( pci, offset, exclude ) )
69 pci_read_config_dword ( pci, offset, dword );
70 }
71 }
72
73 /**
74 * Restore PCI configuration space
75 *
76 * @v pci PCI device
77 * @v backup PCI configuration space backup
78 * @v exclude PCI configuration space backup exclusion list, or NULL
79 */
pci_restore(struct pci_device * pci,struct pci_config_backup * backup,const uint8_t * exclude)80 void pci_restore ( struct pci_device *pci, struct pci_config_backup *backup,
81 const uint8_t *exclude ) {
82 unsigned int offset;
83 uint32_t *dword;
84
85 for ( offset = 0, dword = backup->dwords ; offset < 0x100 ;
86 offset += sizeof ( *dword ) , dword++ ) {
87 if ( ! pci_backup_excluded ( pci, offset, exclude ) )
88 pci_write_config_dword ( pci, offset, *dword );
89 }
90 }
91