1550b33cfSArd Biesheuvel // SPDX-License-Identifier: GPL-2.0-only
2550b33cfSArd Biesheuvel // Copyright 2022 Google LLC
3550b33cfSArd Biesheuvel // Author: Ard Biesheuvel <ardb@google.com>
4550b33cfSArd Biesheuvel
5550b33cfSArd Biesheuvel #include <linux/efi.h>
6550b33cfSArd Biesheuvel
7550b33cfSArd Biesheuvel #include "efistub.h"
8550b33cfSArd Biesheuvel
9550b33cfSArd Biesheuvel typedef struct efi_smbios_protocol efi_smbios_protocol_t;
10550b33cfSArd Biesheuvel
11550b33cfSArd Biesheuvel struct efi_smbios_protocol {
12550b33cfSArd Biesheuvel efi_status_t (__efiapi *add)(efi_smbios_protocol_t *, efi_handle_t,
13550b33cfSArd Biesheuvel u16 *, struct efi_smbios_record *);
14550b33cfSArd Biesheuvel efi_status_t (__efiapi *update_string)(efi_smbios_protocol_t *, u16 *,
15550b33cfSArd Biesheuvel unsigned long *, u8 *);
16550b33cfSArd Biesheuvel efi_status_t (__efiapi *remove)(efi_smbios_protocol_t *, u16);
17550b33cfSArd Biesheuvel efi_status_t (__efiapi *get_next)(efi_smbios_protocol_t *, u16 *, u8 *,
18550b33cfSArd Biesheuvel struct efi_smbios_record **,
19550b33cfSArd Biesheuvel efi_handle_t *);
20550b33cfSArd Biesheuvel
21550b33cfSArd Biesheuvel u8 major_version;
22550b33cfSArd Biesheuvel u8 minor_version;
23550b33cfSArd Biesheuvel };
24550b33cfSArd Biesheuvel
efi_get_smbios_record(u8 type)25eb684408SArd Biesheuvel const struct efi_smbios_record *efi_get_smbios_record(u8 type)
26550b33cfSArd Biesheuvel {
27550b33cfSArd Biesheuvel struct efi_smbios_record *record;
28550b33cfSArd Biesheuvel efi_smbios_protocol_t *smbios;
29550b33cfSArd Biesheuvel efi_status_t status;
30550b33cfSArd Biesheuvel u16 handle = 0xfffe;
31550b33cfSArd Biesheuvel
32550b33cfSArd Biesheuvel status = efi_bs_call(locate_protocol, &EFI_SMBIOS_PROTOCOL_GUID, NULL,
33550b33cfSArd Biesheuvel (void **)&smbios) ?:
34550b33cfSArd Biesheuvel efi_call_proto(smbios, get_next, &handle, &type, &record, NULL);
35550b33cfSArd Biesheuvel if (status != EFI_SUCCESS)
36550b33cfSArd Biesheuvel return NULL;
37eb684408SArd Biesheuvel return record;
38eb684408SArd Biesheuvel }
39eb684408SArd Biesheuvel
__efi_get_smbios_string(const struct efi_smbios_record * record,u8 type,int offset)40eb684408SArd Biesheuvel const u8 *__efi_get_smbios_string(const struct efi_smbios_record *record,
41*f59a7ec1SArd Biesheuvel u8 type, int offset)
42eb684408SArd Biesheuvel {
43eb684408SArd Biesheuvel const u8 *strtable;
44eb684408SArd Biesheuvel
45eb684408SArd Biesheuvel if (!record)
46eb684408SArd Biesheuvel return NULL;
47550b33cfSArd Biesheuvel
4834343eb0SArd Biesheuvel strtable = (u8 *)record + record->length;
49550b33cfSArd Biesheuvel for (int i = 1; i < ((u8 *)record)[offset]; i++) {
50550b33cfSArd Biesheuvel int len = strlen(strtable);
51550b33cfSArd Biesheuvel
52550b33cfSArd Biesheuvel if (!len)
53550b33cfSArd Biesheuvel return NULL;
54550b33cfSArd Biesheuvel strtable += len + 1;
55550b33cfSArd Biesheuvel }
56550b33cfSArd Biesheuvel return strtable;
57550b33cfSArd Biesheuvel }
58