iPXE
bios_smbios.c
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1 /*
2  * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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., 51 Franklin Street, Fifth Floor, Boston, MA
17  * 02110-1301, USA.
18  *
19  * You can also choose to distribute this program under the terms of
20  * the Unmodified Binary Distribution Licence (as given in the file
21  * COPYING.UBDL), provided that you have satisfied its requirements.
22  */
23 
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
25 
26 #include <stdint.h>
27 #include <string.h>
28 #include <errno.h>
29 #include <assert.h>
30 #include <ipxe/uaccess.h>
31 #include <ipxe/smbios.h>
32 #include <realmode.h>
33 #include <pnpbios.h>
34 
35 /** @file
36  *
37  * System Management BIOS
38  *
39  */
40 
41 /**
42  * Find SMBIOS
43  *
44  * @v smbios SMBIOS entry point descriptor structure to fill in
45  * @ret rc Return status code
46  */
47 static int bios_find_smbios ( struct smbios *smbios ) {
48  struct smbios_entry entry;
49  int rc;
50 
51  /* Scan through BIOS segment to find SMBIOS entry point */
52  if ( ( rc = find_smbios_entry ( real_to_user ( BIOS_SEG, 0 ), 0x10000,
53  &entry ) ) != 0 )
54  return rc;
55 
56  /* Fill in entry point descriptor structure */
57  smbios->address = phys_to_user ( entry.smbios_address );
58  smbios->len = entry.smbios_len;
59  smbios->count = entry.smbios_count;
60  smbios->version = SMBIOS_VERSION ( entry.major, entry.minor );
61 
62  return 0;
63 }
64 
struct arbelprm_rc_send_wqe rc
Definition: arbel.h:14
unsigned int count
Number of SMBIOS structures.
Definition: smbios.h:170
Error codes.
size_t len
Length of SMBIOS structures.
Definition: smbios.h:168
userptr_t phys_to_user(unsigned long phys_addr)
Convert physical address to user pointer.
SMBIOS entry point descriptor.
Definition: smbios.h:164
int find_smbios(struct smbios *smbios)
Access to external ("user") memory.
uint16_t version
SMBIOS version.
Definition: smbios.h:172
PROVIDE_SMBIOS(pcbios, find_smbios, bios_find_smbios)
Assertions.
int find_smbios_entry(userptr_t start, size_t len, struct smbios_entry *entry)
Scan for SMBIOS entry point structure.
Definition: smbios.c:52
SMBIOS entry point.
Definition: smbios.h:44
#define SMBIOS_VERSION(major, minor)
Calculate SMBIOS version.
Definition: smbios.h:182
union aes_table_entry entry[256]
Table entries, indexed by S(N)
Definition: aes.c:26
PnP BIOS.
System Management BIOS.
static int bios_find_smbios(struct smbios *smbios)
Find SMBIOS.
Definition: bios_smbios.c:47
userptr_t address
Start of SMBIOS structures.
Definition: smbios.h:166
static __always_inline userptr_t real_to_user(unsigned int segment, unsigned int offset)
Convert segment:offset address to user buffer.
Definition: realmode.h:75
FILE_LICENCE(GPL2_OR_LATER_OR_UBDL)
#define BIOS_SEG
Definition: pnpbios.h:13
String functions.