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Diffstat (limited to 'drivers/firmware/efi/libstub/smbios.c')
-rw-r--r--drivers/firmware/efi/libstub/smbios.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/firmware/efi/libstub/smbios.c b/drivers/firmware/efi/libstub/smbios.c
new file mode 100644
index 000000000000..460418b7f5f5
--- /dev/null
+++ b/drivers/firmware/efi/libstub/smbios.c
@@ -0,0 +1,48 @@
+// 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;
+}