cd6193877c
The smbios.c source file is not currently included in the x86 build, and before we can do so, it needs some tweaks to build correctly in combination with the EFI mixed mode support. Reviewed-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
68 lines
1.6 KiB
C
68 lines
1.6 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 union efi_smbios_protocol efi_smbios_protocol_t;
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union efi_smbios_protocol {
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struct {
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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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struct {
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u32 add;
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u32 update_string;
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u32 remove;
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u32 get_next;
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u8 major_version;
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u8 minor_version;
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} mixed_mode;
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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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const u8 *offset)
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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 < *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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