// 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 u8 *__efi_get_smbios_string(u8 type, int offset, int recsize) { struct efi_smbios_record *record; efi_smbios_protocol_t *smbios; efi_status_t status; u16 handle = 0xfffe; const u8 *strtable; 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; strtable = (u8 *)record + recsize; for (int i = 1; i < ((u8 *)record)[offset]; i++) { int len = strlen(strtable); if (!len) return NULL; strtable += len + 1; } return strtable; }