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