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// SPDX-License-Identifier: GPL-2.0+
/*
* EFI boot manager
*
* Copyright (c) 2018 AKASHI Takahiro, et.al.
*/
#define LOG_CATEGORY LOGC_EFI
#include <common.h>
#include <charset.h>
#include <log.h>
#include <malloc.h>
#include <efi_loader.h>
#include <asm/unaligned.h>
/**
* efi_set_load_options() - set the load options of a loaded image
*
* @handle: the image handle
* @load_options_size: size of load options
* @load_options: pointer to load options
* Return: status code
*/
efi_status_t efi_set_load_options(efi_handle_t handle,
efi_uintn_t load_options_size,
void *load_options)
{
struct efi_loaded_image *loaded_image_info;
struct efi_handler *handler;
efi_status_t ret;
ret = efi_search_protocol(handle, &efi_guid_loaded_image, &handler);
loaded_image_info = handler->protocol_interface;
if (ret != EFI_SUCCESS)
return EFI_INVALID_PARAMETER;
loaded_image_info->load_options = load_options;
loaded_image_info->load_options_size = load_options_size;
return EFI_SUCCESS;
}
/**
* efi_deserialize_load_option() - parse serialized data
*
* Parse serialized data describing a load option and transform it to the
* efi_load_option structure.
*
* @lo: pointer to target
* @data: serialized data
* @size: size of the load option, on return size of the optional data
* Return: status code
*/
efi_status_t efi_deserialize_load_option(struct efi_load_option *lo, u8 *data,
efi_uintn_t *size)
{
efi_uintn_t len;
len = sizeof(u32);
if (*size < len + 2 * sizeof(u16))
return EFI_INVALID_PARAMETER;
lo->attributes = get_unaligned_le32(data);
data += len;
*size -= len;
len = sizeof(u16);
lo->file_path_length = get_unaligned_le16(data);
data += len;
*size -= len;
lo->label = (u16 *)data;
len = u16_strnlen(lo->label, *size / sizeof(u16) - 1);
if (lo->label[len])
return EFI_INVALID_PARAMETER;
len = (len + 1) * sizeof(u16);
if (*size < len)
return EFI_INVALID_PARAMETER;
data += len;
*size -= len;
len = lo->file_path_length;
if (*size < len)
return EFI_INVALID_PARAMETER;
lo->file_path = (struct efi_device_path *)data;
if (efi_dp_check_length(lo->file_path, len) < 0)
return EFI_INVALID_PARAMETER;
data += len;
*size -= len;
lo->optional_data = data;
return EFI_SUCCESS;
}
/**
* efi_serialize_load_option() - serialize load option
*
* Serialize efi_load_option structure into byte stream for BootXXXX.
*
* @data: buffer for serialized data
* @lo: load option
* Return: size of allocated buffer
*/
unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data)
{
unsigned long label_len;
unsigned long size;
u8 *p;
label_len = u16_strsize(lo->label);
/* total size */
size = sizeof(lo->attributes);
size += sizeof(lo->file_path_length);
size += label_len;
size += lo->file_path_length;
if (lo->optional_data)
size += (utf8_utf16_strlen((const char *)lo->optional_data)
+ 1) * sizeof(u16);
p = malloc(size);
if (!p)
return 0;
/* copy data */
*data = p;
memcpy(p, &lo->attributes, sizeof(lo->attributes));
p += sizeof(lo->attributes);
memcpy(p, &lo->file_path_length, sizeof(lo->file_path_length));
p += sizeof(lo->file_path_length);
memcpy(p, lo->label, label_len);
p += label_len;
memcpy(p, lo->file_path, lo->file_path_length);
p += lo->file_path_length;
if (lo->optional_data) {
utf8_utf16_strcpy((u16 **)&p, (const char *)lo->optional_data);
p += sizeof(u16); /* size of trailing \0 */
}
return size;
}
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