129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/*
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* Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdio.h>
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#include <errno.h>
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#include <ipxe/pci.h>
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#include <ipxe/settings.h>
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#include <ipxe/init.h>
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/** @file
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*
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* PCI device settings
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*
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*/
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/** PCI device settings scope */
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static const struct settings_scope pci_settings_scope;
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/**
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* Check applicability of PCI device setting
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*
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* @v settings Settings block
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* @v setting Setting
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* @ret applies Setting applies within this settings block
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*/
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static int pci_settings_applies ( struct settings *settings __unused,
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const struct setting *setting ) {
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return ( setting->scope == &pci_settings_scope );
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}
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/**
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* Fetch value of PCI device setting
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*
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* @v settings Settings block
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* @v setting Setting to fetch
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* @v data Buffer to fill with setting data
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* @v len Length of buffer
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* @ret len Length of setting data, or negative error
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*/
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static int pci_settings_fetch ( struct settings *settings __unused,
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struct setting *setting,
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void *data, size_t len ) {
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struct pci_device pci;
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unsigned int tag_busdevfn;
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unsigned int tag_offset;
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unsigned int tag_len;
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unsigned int i;
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/* Extract busdevfn, offset, and length from tag */
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tag_busdevfn = ( setting->tag >> 16 );
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tag_offset = ( ( setting->tag >> 8 ) & 0xff );
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tag_len = ( ( setting->tag >> 0 ) & 0xff );
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/* Locate PCI device */
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memset ( &pci, 0, sizeof ( pci ) );
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pci_init ( &pci, tag_busdevfn );
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DBG ( PCI_FMT " reading %#02x+%#x\n", PCI_ARGS ( &pci ),
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tag_offset, tag_len );
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/* Read data one byte at a time, in reverse order (since PCI
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* is little-endian and iPXE settings are essentially
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* big-endian).
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*/
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tag_offset += tag_len;
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for ( i = 0 ; ( ( i < tag_len ) && ( i < len ) ); i++ ) {
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pci_read_config_byte ( &pci, --tag_offset, data++ );
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}
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/* Set type to ":hexraw" if not already specified */
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if ( ! setting->type )
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setting->type = &setting_type_hexraw;
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return tag_len;
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}
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/** PCI device settings operations */
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static struct settings_operations pci_settings_operations = {
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.applies = pci_settings_applies,
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.fetch = pci_settings_fetch,
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};
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/** PCI device settings */
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static struct settings pci_settings = {
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.refcnt = NULL,
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.siblings = LIST_HEAD_INIT ( pci_settings.siblings ),
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.children = LIST_HEAD_INIT ( pci_settings.children ),
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.op = &pci_settings_operations,
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.default_scope = &pci_settings_scope,
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};
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/** Initialise PCI device settings */
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static void pci_settings_init ( void ) {
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int rc;
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if ( ( rc = register_settings ( &pci_settings, NULL, "pci" ) ) != 0 ) {
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DBG ( "PCI could not register settings: %s\n",
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strerror ( rc ) );
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return;
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}
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}
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/** PCI device settings initialiser */
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struct init_fn pci_settings_init_fn __init_fn ( INIT_NORMAL ) = {
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.initialise = pci_settings_init,
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};
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