58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
// Copyright 2022 Google LLC
|
|
// Author: Ard Biesheuvel <ardb@google.com>
|
|
|
|
#include <linux/efi.h>
|
|
|
|
#include "efistub.h"
|
|
|
|
typedef struct efi_smbios_protocol efi_smbios_protocol_t;
|
|
|
|
struct efi_smbios_protocol {
|
|
efi_status_t (__efiapi *add)(efi_smbios_protocol_t *, efi_handle_t,
|
|
u16 *, struct efi_smbios_record *);
|
|
efi_status_t (__efiapi *update_string)(efi_smbios_protocol_t *, u16 *,
|
|
unsigned long *, u8 *);
|
|
efi_status_t (__efiapi *remove)(efi_smbios_protocol_t *, u16);
|
|
efi_status_t (__efiapi *get_next)(efi_smbios_protocol_t *, u16 *, u8 *,
|
|
struct efi_smbios_record **,
|
|
efi_handle_t *);
|
|
|
|
u8 major_version;
|
|
u8 minor_version;
|
|
};
|
|
|
|
const struct efi_smbios_record *efi_get_smbios_record(u8 type)
|
|
{
|
|
struct efi_smbios_record *record;
|
|
efi_smbios_protocol_t *smbios;
|
|
efi_status_t status;
|
|
u16 handle = 0xfffe;
|
|
|
|
status = efi_bs_call(locate_protocol, &EFI_SMBIOS_PROTOCOL_GUID, NULL,
|
|
(void **)&smbios) ?:
|
|
efi_call_proto(smbios, get_next, &handle, &type, &record, NULL);
|
|
if (status != EFI_SUCCESS)
|
|
return NULL;
|
|
return record;
|
|
}
|
|
|
|
const u8 *__efi_get_smbios_string(const struct efi_smbios_record *record,
|
|
u8 type, int offset)
|
|
{
|
|
const u8 *strtable;
|
|
|
|
if (!record)
|
|
return NULL;
|
|
|
|
strtable = (u8 *)record + record->length;
|
|
for (int i = 1; i < ((u8 *)record)[offset]; i++) {
|
|
int len = strlen(strtable);
|
|
|
|
if (!len)
|
|
return NULL;
|
|
strtable += len + 1;
|
|
}
|
|
return strtable;
|
|
}
|