116 lines
3.5 KiB
C
116 lines
3.5 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 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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FILE_LICENCE ( GPL2_OR_LATER );
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#include <errno.h>
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#include <linux_api.h>
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#include <ipxe/linux.h>
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#include <ipxe/smbios.h>
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/** SMBIOS filename */
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static const char smbios_filename[] = "/dev/mem";
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/** SMBIOS entry point scan region start address */
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#define SMBIOS_ENTRY_START 0xf0000
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/** SMBIOS entry point scan region length */
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#define SMBIOS_ENTRY_LEN 0x10000
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/** SMBIOS mapping alignment */
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#define SMBIOS_ALIGN 0x1000
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/**
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* Find SMBIOS
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*
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* @v smbios SMBIOS entry point descriptor structure to fill in
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* @ret rc Return status code
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*/
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static int linux_find_smbios ( struct smbios *smbios ) {
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struct smbios_entry entry;
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void *entry_mem;
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void *smbios_mem;
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size_t smbios_offset;
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size_t smbios_indent;
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size_t smbios_len;
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int fd;
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int rc;
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/* Open SMBIOS file */
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fd = linux_open ( smbios_filename, O_RDONLY );
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if ( fd < 0 ) {
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rc = -ELINUX ( linux_errno );
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DBGC ( smbios, "SMBIOS could not open %s: %s\n",
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smbios_filename, linux_strerror ( linux_errno ) );
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goto err_open;
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}
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/* Map the region potentially containing the SMBIOS entry point */
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entry_mem = linux_mmap ( NULL, SMBIOS_ENTRY_LEN, PROT_READ, MAP_SHARED,
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fd, SMBIOS_ENTRY_START );
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if ( entry_mem == MAP_FAILED ) {
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rc = -ELINUX ( linux_errno );
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DBGC ( smbios, "SMBIOS could not mmap %s (%#x+%#x): %s\n",
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smbios_filename, SMBIOS_ENTRY_START, SMBIOS_ENTRY_LEN,
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linux_strerror ( linux_errno ) );
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goto err_mmap_entry;
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}
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/* Scan for the SMBIOS entry point */
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if ( ( rc = find_smbios_entry ( virt_to_user ( entry_mem ),
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SMBIOS_ENTRY_LEN, &entry ) ) != 0 )
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goto err_find_entry;
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/* Map the region containing the SMBIOS structures */
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smbios_indent = ( entry.smbios_address & ( SMBIOS_ALIGN - 1 ) );
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smbios_offset = ( entry.smbios_address - smbios_indent );
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smbios_len = ( entry.smbios_len + smbios_indent );
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smbios_mem = linux_mmap ( NULL, smbios_len, PROT_READ, MAP_SHARED,
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fd, smbios_offset );
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if ( smbios_mem == MAP_FAILED ) {
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rc = -ELINUX ( linux_errno );
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DBGC ( smbios, "SMBIOS could not mmap %s (%#zx+%#zx): %s\n",
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smbios_filename, smbios_offset, smbios_len,
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linux_strerror ( linux_errno ) );
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goto err_mmap_smbios;
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}
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/* Fill in entry point descriptor structure */
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smbios->address = virt_to_user ( smbios_mem + smbios_indent );
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smbios->len = entry.smbios_len;
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smbios->count = entry.smbios_count;
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smbios->version = SMBIOS_VERSION ( entry.major, entry.minor );
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/* Unmap the entry point region (no longer required) */
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linux_munmap ( entry_mem, SMBIOS_ENTRY_LEN );
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return 0;
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linux_munmap ( smbios_mem, smbios_len );
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err_mmap_smbios:
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err_find_entry:
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linux_munmap ( entry_mem, SMBIOS_ENTRY_LEN );
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err_mmap_entry:
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linux_close ( fd );
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err_open:
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return rc;
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}
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PROVIDE_SMBIOS ( linux, find_smbios, linux_find_smbios );
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