Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / drivers / bus / pcibackup.c

diff --git a/qemu/roms/ipxe/src/drivers/bus/pcibackup.c b/qemu/roms/ipxe/src/drivers/bus/pcibackup.c
new file mode 100644 (file)
index 0000000..6b592e8
--- /dev/null
+++ b/qemu/roms/ipxe/src/drivers/bus/pcibackup.c
@@ -0,0 +1,91 @@
+/*
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+#include <ipxe/pci.h>
+#include <ipxe/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 );
+       }
+}