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Annotation of qemu/roms/ipxe/src/drivers/bus/pcibackup.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (C) 2009 Michael Brown <[email protected]>.
        !             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 <ipxe/pci.h>
        !            23: #include <ipxe/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: }

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