1 /* 2 * Copyright (C) 2009 Michael Brown <mbrown (at) 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 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 */ 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 */ 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
