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-rw-r--r--gpxe/src/drivers/bus/pcibackup.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/gpxe/src/drivers/bus/pcibackup.c b/gpxe/src/drivers/bus/pcibackup.c
new file mode 100644
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+++ b/gpxe/src/drivers/bus/pcibackup.c
@@ -0,0 +1,90 @@
+/*
+ * 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 );
+ }
+}