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