150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* EFI boot manager
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*
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* Copyright (c) 2018 AKASHI Takahiro, et.al.
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*/
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#define LOG_CATEGORY LOGC_EFI
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#include <common.h>
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#include <charset.h>
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#include <log.h>
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#include <malloc.h>
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#include <efi_loader.h>
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#include <asm/unaligned.h>
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/**
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* efi_set_load_options() - set the load options of a loaded image
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*
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* @handle: the image handle
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* @load_options_size: size of load options
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* @load_options: pointer to load options
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* Return: status code
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*/
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efi_status_t efi_set_load_options(efi_handle_t handle,
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efi_uintn_t load_options_size,
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void *load_options)
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{
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struct efi_loaded_image *loaded_image_info;
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efi_status_t ret;
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ret = EFI_CALL(systab.boottime->open_protocol(
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handle,
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&efi_guid_loaded_image,
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(void **)&loaded_image_info,
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efi_root, NULL,
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EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL));
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if (ret != EFI_SUCCESS)
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return EFI_INVALID_PARAMETER;
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loaded_image_info->load_options = load_options;
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loaded_image_info->load_options_size = load_options_size;
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return EFI_CALL(systab.boottime->close_protocol(handle,
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&efi_guid_loaded_image,
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efi_root, NULL));
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}
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/**
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* efi_deserialize_load_option() - parse serialized data
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*
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* Parse serialized data describing a load option and transform it to the
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* efi_load_option structure.
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*
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* @lo: pointer to target
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* @data: serialized data
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* @size: size of the load option, on return size of the optional data
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* Return: status code
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*/
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efi_status_t efi_deserialize_load_option(struct efi_load_option *lo, u8 *data,
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efi_uintn_t *size)
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{
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efi_uintn_t len;
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len = sizeof(u32);
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if (*size < len + 2 * sizeof(u16))
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return EFI_INVALID_PARAMETER;
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lo->attributes = get_unaligned_le32(data);
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data += len;
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*size -= len;
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len = sizeof(u16);
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lo->file_path_length = get_unaligned_le16(data);
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data += len;
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*size -= len;
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lo->label = (u16 *)data;
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len = u16_strnlen(lo->label, *size / sizeof(u16) - 1);
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if (lo->label[len])
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return EFI_INVALID_PARAMETER;
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len = (len + 1) * sizeof(u16);
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if (*size < len)
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return EFI_INVALID_PARAMETER;
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data += len;
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*size -= len;
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len = lo->file_path_length;
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if (*size < len)
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return EFI_INVALID_PARAMETER;
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lo->file_path = (struct efi_device_path *)data;
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if (efi_dp_check_length(lo->file_path, len) < 0)
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return EFI_INVALID_PARAMETER;
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data += len;
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*size -= len;
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lo->optional_data = data;
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return EFI_SUCCESS;
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}
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/**
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* efi_serialize_load_option() - serialize load option
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*
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* Serialize efi_load_option structure into byte stream for BootXXXX.
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*
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* @data: buffer for serialized data
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* @lo: load option
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* Return: size of allocated buffer
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*/
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unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data)
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{
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unsigned long label_len;
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unsigned long size;
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u8 *p;
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label_len = (u16_strlen(lo->label) + 1) * sizeof(u16);
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/* total size */
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size = sizeof(lo->attributes);
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size += sizeof(lo->file_path_length);
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size += label_len;
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size += lo->file_path_length;
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if (lo->optional_data)
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size += (utf8_utf16_strlen((const char *)lo->optional_data)
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+ 1) * sizeof(u16);
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p = malloc(size);
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if (!p)
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return 0;
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/* copy data */
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*data = p;
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memcpy(p, &lo->attributes, sizeof(lo->attributes));
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p += sizeof(lo->attributes);
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memcpy(p, &lo->file_path_length, sizeof(lo->file_path_length));
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p += sizeof(lo->file_path_length);
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memcpy(p, lo->label, label_len);
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p += label_len;
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memcpy(p, lo->file_path, lo->file_path_length);
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p += lo->file_path_length;
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if (lo->optional_data) {
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utf8_utf16_strcpy((u16 **)&p, (const char *)lo->optional_data);
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p += sizeof(u16); /* size of trailing \0 */
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}
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return size;
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}
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