137 lines
4.7 KiB
C
137 lines
4.7 KiB
C
/*
|
|
* Copyright (c) 2021, Intel Corporation.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer
|
|
* in the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* * Neither the name of Intel Corporation nor the names of its
|
|
* contributors may be used to endorse or promote products
|
|
* derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
|
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <efi.h>
|
|
#include <efilib.h>
|
|
#include "boot.h"
|
|
#include "stdlib.h"
|
|
#include "multiboot.h"
|
|
|
|
/**
|
|
* @brief Search the first len bytes in buffer for multiboot1 header.
|
|
*
|
|
* @param[in] buffer Buffer to be searched
|
|
* @param[in] len Search length
|
|
*
|
|
* @return A pointer to the multiboot1 header if found. NULL otherwise.
|
|
*/
|
|
const struct multiboot_header *find_mb1header(const UINT8 *buffer, uint64_t len)
|
|
{
|
|
const struct multiboot_header *header;
|
|
|
|
for (header = (struct multiboot_header *)buffer;
|
|
((char *)header <= (char *)buffer + len - 12);
|
|
header = (struct multiboot_header *)((char *)header + MULTIBOOT_HEADER_ALIGN))
|
|
{
|
|
if (header->mh_magic == MULTIBOOT_HEADER_MAGIC &&
|
|
!(header->mh_magic + header->mh_flags + header->mh_checksum))
|
|
return header;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* @brief Search the first len bytes in buffer for multiboot2 header.
|
|
*
|
|
* @param[in] buffer Buffer to be searched
|
|
* @param[in] len Search length
|
|
*
|
|
* @return A pointer to the multiboot2 header if found. NULL otherwise.
|
|
*/
|
|
const struct multiboot2_header *find_mb2header(const UINT8 *buffer, uint64_t len)
|
|
{
|
|
const struct multiboot2_header *header;
|
|
|
|
for (header = (const struct multiboot2_header *)buffer;
|
|
((char *)header <= (char *)buffer + len - 12);
|
|
header = (struct multiboot2_header *)((uint64_t)header + MULTIBOOT2_HEADER_ALIGN / 4))
|
|
{
|
|
if (header->magic == MULTIBOOT2_HEADER_MAGIC &&
|
|
!(header->magic + header->architecture + header->header_length + header->checksum) &&
|
|
header->architecture == MULTIBOOT2_ARCHITECTURE_I386)
|
|
return header;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* @brief Parse the multiboot2 header and return a list of pointers to the header tags.
|
|
*
|
|
* @param[in] header Multiboot2 header to be parsed.
|
|
* @param[out] hv_tags An hv_mb2header_tag_list struct that contains pointers to all possible
|
|
* tags in a multiboot2 header. If a field in this struct is not NULL, it
|
|
* means the tag was found in the given header. NULL otherwise.
|
|
*
|
|
* @return 0 on success. -1 on error.
|
|
*/
|
|
int parse_mb2header(const struct multiboot2_header *header, struct hv_mb2header_tag_list *hv_tags)
|
|
{
|
|
struct multiboot2_header_tag *tag;
|
|
|
|
memset(hv_tags, 0, sizeof(struct hv_mb2header_tag_list));
|
|
|
|
for (tag = (struct multiboot2_header_tag *)(header + 1);
|
|
tag->type != MULTIBOOT2_TAG_TYPE_END;
|
|
tag = (struct multiboot2_header_tag *)((uint32_t *)tag + ALIGN_UP(tag->size, MULTIBOOT2_TAG_ALIGN) / 4))
|
|
{
|
|
switch (tag->type) {
|
|
case MULTIBOOT2_HEADER_TAG_INFORMATION_REQUEST:
|
|
/* Ignored. Currently we didn't support all categories of requested information,
|
|
* only the part that ACRN requests. So we don't parse the requests here. */
|
|
break;
|
|
|
|
case MULTIBOOT2_HEADER_TAG_ADDRESS:
|
|
hv_tags->addr = (struct multiboot2_header_tag_address *)tag;
|
|
break;
|
|
|
|
case MULTIBOOT2_HEADER_TAG_ENTRY_ADDRESS:
|
|
hv_tags->entry = (struct multiboot2_header_tag_entry_address *)tag;
|
|
break;
|
|
|
|
case MULTIBOOT2_HEADER_TAG_RELOCATABLE:
|
|
hv_tags->reloc = (struct multiboot2_header_tag_relocatable *)tag;
|
|
break;
|
|
|
|
default:
|
|
Print(L"Unsupported multiboot2 tag type: %d\n", tag->type);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (hv_tags->addr && !hv_tags->entry)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|