mirror of https://github.com/wolfSSL/wolfBoot.git
78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
/* wolfboot_efi.h
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*
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* Shared helpers for the wolfBoot EFI-application targets (aarch64_efi,
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* x86_64_efi).
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*
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* Copyright (C) 2026 wolfSSL Inc.
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*
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* This file is part of wolfBoot.
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*
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* wolfBoot is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* wolfBoot is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*/
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#ifndef WOLFBOOT_EFI_H
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#define WOLFBOOT_EFI_H
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/* IMPORTANT: include this AFTER the gnu-efi headers (<efi/efi.h>,
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* <efi/efilib.h>) so the EFI types (CHAR16/UINTN/BS/uefi_call_wrapper) are
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* visible. wolfBoot declarations (HDR_CMDLINE, IMAGE_HEADER_OFFSET,
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* wolfBoot_find_header) come from wolfboot/wolfboot.h, included below. */
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#include "wolfboot/wolfboot.h"
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/* Return the authenticated OS command line (the HDR_CMDLINE TLV) from a
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* VERIFIED wolfBoot manifest header as a NUL-terminated CHAR16 buffer suitable
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* for an EFI LoadedImage's LoadOptions. The TLV is covered by the image
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* signature, so this must be called only AFTER the image has been verified.
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*
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* `manifest` points at the wolfBoot header (i.e. boot_addr - IMAGE_HEADER_SIZE).
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* Returns NULL and sets *out_bytes = 0 when the image carries no command-line
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* TLV (the caller then boots with no command line, so the kernel uses its
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* built-in CONFIG_CMDLINE). The returned buffer is allocated with
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* BS->AllocatePool (EfiLoaderData) and includes the terminating NUL in
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* *out_bytes (a byte count). */
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static inline CHAR16 *wolfBoot_efi_get_cmdline(const uint8_t *manifest,
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UINTN *out_bytes)
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{
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uint8_t *val = NULL;
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uint16_t len;
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UINTN i;
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CHAR16 *wide = NULL;
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EFI_STATUS status;
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*out_bytes = 0;
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if (manifest == NULL)
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return NULL;
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len = wolfBoot_find_header((uint8_t *)(manifest + IMAGE_HEADER_OFFSET),
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HDR_CMDLINE, &val);
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if (len == 0 || val == NULL)
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return NULL; /* no signed command line present */
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status = uefi_call_wrapper(BS->AllocatePool, 3, EfiLoaderData,
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((UINTN)len + 1) * sizeof(CHAR16), (void **)&wide);
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if (status != EFI_SUCCESS || wide == NULL)
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return NULL;
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/* The TLV value is ASCII and not NUL-terminated; widen exactly len bytes. */
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for (i = 0; i < (UINTN)len; i++)
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wide[i] = (CHAR16)val[i];
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wide[len] = 0;
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*out_bytes = ((UINTN)len + 1) * sizeof(CHAR16);
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return wide;
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}
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#endif /* WOLFBOOT_EFI_H */
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