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[settings] Expose PCI configuration space via settings mechanism
Allow values to be read from PCI configuration space using the syntax ${pci/<busdevfn>.<offset>.<length>} where <busdevfn> is the bus:dev.fn address of the PCI device (expressed as a single integer, as returned by ${net0/busloc}), <offset> is the offset within PCI configuration space, and <length> is the length within PCI configuration space. Values are returned in reverse byte order, since PCI configuration space is little-endian by definition. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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/* | ||
* Copyright (C) 2013 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 (at your option) 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. | ||
*/ | ||
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FILE_LICENCE ( GPL2_OR_LATER ); | ||
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#include <stdio.h> | ||
#include <errno.h> | ||
#include <ipxe/pci.h> | ||
#include <ipxe/settings.h> | ||
#include <ipxe/init.h> | ||
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/** @file | ||
* | ||
* PCI device settings | ||
* | ||
*/ | ||
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/** PCI device settings scope */ | ||
static struct settings_scope pci_settings_scope; | ||
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/** | ||
* Check applicability of PCI device setting | ||
* | ||
* @v settings Settings block | ||
* @v setting Setting | ||
* @ret applies Setting applies within this settings block | ||
*/ | ||
static int pci_settings_applies ( struct settings *settings __unused, | ||
struct setting *setting ) { | ||
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return ( setting->scope == &pci_settings_scope ); | ||
} | ||
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/** | ||
* Fetch value of PCI device setting | ||
* | ||
* @v settings Settings block | ||
* @v setting Setting to fetch | ||
* @v data Buffer to fill with setting data | ||
* @v len Length of buffer | ||
* @ret len Length of setting data, or negative error | ||
*/ | ||
static int pci_settings_fetch ( struct settings *settings __unused, | ||
struct setting *setting, | ||
void *data, size_t len ) { | ||
struct pci_device pci; | ||
unsigned int tag_busdevfn; | ||
unsigned int tag_offset; | ||
unsigned int tag_len; | ||
unsigned int i; | ||
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/* Extract busdevfn, offset, and length from tag */ | ||
tag_busdevfn = ( ( setting->tag >> 16 ) & 0xffff ); | ||
tag_offset = ( ( setting->tag >> 8 ) & 0xff ); | ||
tag_len = ( ( setting->tag >> 0 ) & 0xff ); | ||
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/* Locate PCI device */ | ||
memset ( &pci, 0, sizeof ( pci ) ); | ||
pci_init ( &pci, tag_busdevfn ); | ||
DBG ( PCI_FMT " reading %#02x+%#x\n", PCI_ARGS ( &pci ), | ||
tag_offset, tag_len ); | ||
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/* Read data one byte at a time, in reverse order (since PCI | ||
* is little-endian and iPXE settings are essentially | ||
* big-endian). | ||
*/ | ||
tag_offset += tag_len; | ||
for ( i = 0 ; ( ( i < tag_len ) && ( i < len ) ); i++ ) { | ||
pci_read_config_byte ( &pci, --tag_offset, data++ ); | ||
} | ||
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/* Set type to ":hexraw" if not already specified */ | ||
if ( ! setting->type ) | ||
setting->type = &setting_type_hexraw; | ||
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return tag_len; | ||
} | ||
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/** PCI device settings operations */ | ||
static struct settings_operations pci_settings_operations = { | ||
.applies = pci_settings_applies, | ||
.fetch = pci_settings_fetch, | ||
}; | ||
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/** PCI device settings */ | ||
static struct settings pci_settings = { | ||
.refcnt = NULL, | ||
.siblings = LIST_HEAD_INIT ( pci_settings.siblings ), | ||
.children = LIST_HEAD_INIT ( pci_settings.children ), | ||
.op = &pci_settings_operations, | ||
.default_scope = &pci_settings_scope, | ||
}; | ||
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/** Initialise PCI device settings */ | ||
static void pci_settings_init ( void ) { | ||
int rc; | ||
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if ( ( rc = register_settings ( &pci_settings, NULL, "pci" ) ) != 0 ) { | ||
DBG ( "PCI could not register settings: %s\n", | ||
strerror ( rc ) ); | ||
return; | ||
} | ||
} | ||
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/** PCI device settings initialiser */ | ||
struct init_fn pci_settings_init_fn __init_fn ( INIT_NORMAL ) = { | ||
.initialise = pci_settings_init, | ||
}; |
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