diff options
author | Yang Zhang <yang.z.zhang@intel.com> | 2015-08-28 09:58:54 +0800 |
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committer | Yang Zhang <yang.z.zhang@intel.com> | 2015-09-01 12:44:00 +0800 |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/roms/ipxe/src/drivers/bus/pcibackup.c | |
parent | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff) |
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/roms/ipxe/src/drivers/bus/pcibackup.c')
-rw-r--r-- | qemu/roms/ipxe/src/drivers/bus/pcibackup.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/drivers/bus/pcibackup.c b/qemu/roms/ipxe/src/drivers/bus/pcibackup.c new file mode 100644 index 000000000..6b592e893 --- /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 ); + } +} |