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Commit 4b2aebd5 authored by Marek Vasut's avatar Marek Vasut
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Add MX28 u-boot.sb SB image generator.

Tested on DENX M28EVK by generating u-boot.sb and then loading it
via mxsldr.
Signed-off-by: Marek Vasut's avatarMarek Vasut <marex@denx.de>
parents
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Makefile 0 → 100644
View file @ 4b2aebd5
CFLAGS=`pkg-config --cflags libcrypto` -Wall
LDFLAGS=`pkg-config --libs libcrypto`
mxssb: mxssb.c
$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $<
clean:
rm -f mxssb
mxssb.c 0 → 100644
View file @ 4b2aebd5
/*
* Freescale i.MX28 SB image generator
*
* Copyright (C) 2012 Marek Vasut <marex@denx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <asm/byteorder.h>
#include <openssl/evp.h>
#include "mxssb.h"
/* Tweak here only if needed! */
const char *output_filename = "u-boot.sb";
const char *spl_filename = "spl/u-boot-spl.bin";
const char *uboot_filename = "u-boot.bin";
const int verbose_boot = 1;
#define SB_IVT_LOAD_ADDR 0x8000
#define SB_SPL_LOAD_ADDR 0x0
#define SB_SPL_ENTRY_ADDR 0x14
#define SB_UBOOT_LOAD_ADDR 0x40000100
static struct sb_ivt_header sb_spl_ivt = {
.header = SB_HAB_IVT_HEADER(sizeof(sb_spl_ivt)),
.entry = SB_SPL_ENTRY_ADDR,
.self = SB_IVT_LOAD_ADDR,
};
static struct sb_ivt_header sb_uboot_ivt = {
.header = SB_HAB_IVT_HEADER(sizeof(sb_uboot_ivt)),
.entry = SB_UBOOT_LOAD_ADDR,
.self = SB_IVT_LOAD_ADDR,
};
static struct sb_source_entry mx28_boot_list[] = {
{
.instruction = SB_INSTRUCTION_TAG,
.flags = SB_INSTRUCTION_FLAG_LAST_TAG,
}, {
.instruction = SB_INSTRUCTION_LOAD,
.address = SB_SPL_LOAD_ADDR,
/* .payload is loaded at run time. */
/* .length is loaded at run time. */
}, {
.instruction = SB_INSTRUCTION_LOAD,
.address = SB_IVT_LOAD_ADDR,
.payload = (uint8_t *)&sb_spl_ivt,
.length = sizeof(sb_spl_ivt),
}, {
.instruction = SB_INSTRUCTION_CALL,
.flags = SB_INSTRUCTION_FLAG_HAB,
.address = SB_IVT_LOAD_ADDR,
}, {
.instruction = SB_INSTRUCTION_LOAD,
.address = SB_UBOOT_LOAD_ADDR,
/* .payload is loaded at run time. */
/* .length is loaded at run time. */
}, {
.instruction = SB_INSTRUCTION_LOAD,
.address = SB_IVT_LOAD_ADDR,
.payload = (uint8_t *)&sb_uboot_ivt,
.length = sizeof(sb_uboot_ivt),
}, {
.instruction = SB_INSTRUCTION_CALL,
.flags = SB_INSTRUCTION_FLAG_HAB,
.address = SB_IVT_LOAD_ADDR,
}
};
static struct sb_boot_image_header sb_header_template = {
.signature1 = { 'S', 'T', 'M', 'P' },
.major_version = SB_VERSION_MAJOR,
.minor_version = SB_VERSION_MINOR,
.image_blocks =
( /*
* The amount of blocks below is not final, this is
* only the amount of bytes until the section #0.
*/
/* The main SB header. */
sizeof(struct sb_boot_image_header) +
/* The section #0 header. */
sizeof(struct sb_sections_header) +
/* The key dictionary. */
sizeof(struct sb_key_dictionary_key)
) / SB_BLOCK_SIZE,
.first_boot_section_id = 0,
.key_count = 1,
.header_blocks = sizeof(struct sb_boot_image_header) / SB_BLOCK_SIZE,
.section_count = 1,
.section_header_size = sizeof(struct sb_sections_header) / SB_BLOCK_SIZE,
.signature2 = { 's', 'g', 't', 'l' },
.product_version = {
.major = __cpu_to_be16(0x999),
.minor = __cpu_to_be16(0x999),
.revision = __cpu_to_be16(0x999),
},
.component_version = {
.major = __cpu_to_be16(0x999),
.minor = __cpu_to_be16(0x999),
.revision = __cpu_to_be16(0x999),
},
.drive_tag = 0, /* Must be 0x0 for MX233. */
};
/* Blank image key. */
static uint8_t image_key[16] = {0};
/*
* AES libcrypto
*/
static int sb_aes_init(EVP_CIPHER_CTX *ctx, uint8_t *iv)
{
/* If there is no init vector, init vector is all zeroes. */
if (!iv)
iv = image_key;
EVP_CIPHER_CTX_init(ctx);
return EVP_EncryptInit(ctx, EVP_aes_128_cbc(), image_key, iv);
}
static int sb_aes_encrypt(EVP_CIPHER_CTX *ctx, uint8_t *in_data,
uint8_t *out_data, int in_len)
{
int ret, outlen;
uint8_t *outbuf;
outbuf = malloc(in_len);
if (!outbuf)
return -ENOMEM;
memset(outbuf, 0, sizeof(in_len));
ret = EVP_EncryptUpdate(ctx, outbuf, &outlen, in_data, in_len);
if (!ret) {
ret = -EINVAL;
goto err;
}
if (out_data)
memcpy(out_data, outbuf, outlen);
err:
free(outbuf);
return ret;
}
static int sb_aes_deinit(EVP_CIPHER_CTX *ctx)
{
return EVP_CIPHER_CTX_cleanup(ctx);
}
static int sb_aes_reinit(EVP_CIPHER_CTX *ctx, uint8_t *iv)
{
int ret;
ret = sb_aes_deinit(ctx);
if (!ret)
return ret;
return sb_aes_init(ctx, iv);
}
/*
* CRC32
*/
static uint32_t crc32(uint8_t *data, int len)
{
const uint32_t poly = 0x04c11db7;
uint32_t crc32 = 0xffffffff;
int byte, bit;
for (byte = 0; byte < len; byte++) {
crc32 ^= data[byte] << 24;
for (bit = 8; bit > 0; bit--) {
if (crc32 & (1 << 31))
crc32 = (crc32 << 1) ^ poly;
else
crc32 = (crc32 << 1);
}
}
return crc32;
}
/*
* Code
*/
static int sb_get_sections_block_size(void)
{
struct sb_source_entry *src = mx28_boot_list;
unsigned int insts = ARRAY_SIZE(mx28_boot_list);
unsigned int size = insts * sizeof(struct sb_instruction);
unsigned int i;
for(i = 0; i < ARRAY_SIZE(mx28_boot_list); i++, src++)
if(src->instruction == SB_INSTRUCTION_LOAD)
size += src->length;
return size / SB_BLOCK_SIZE;
}
static time_t sb_get_timestamp(void)
{
struct tm time_2000 = {
.tm_yday = 1, /* Jan. 1st */
.tm_year = 100, /* 2000 */
};
time_t seconds_to_2000 = mktime(&time_2000);
time_t seconds_to_now = time(NULL);
return seconds_to_now - seconds_to_2000;
}
static void sb_complete_sb_header(void)
{
struct sb_boot_image_header *sb_header = &sb_header_template;
EVP_MD_CTX md_ctx;
EVP_MD_CTX_init(&md_ctx);
EVP_DigestInit(&md_ctx, EVP_sha1());
sb_header->image_blocks +=
sb_get_sections_block_size() + /* Size of the section #0. */
2; /* Size of the image's SHA1 digest. */
sb_header->flags = verbose_boot ? SB_IMAGE_FLAG_VERBOSE : 0,
sb_header->key_dictionary_block =
sb_header->header_blocks +
sb_header->section_header_size * sb_header->section_count;
sb_header->first_boot_tag_block =
sb_header->key_dictionary_block +
sizeof(struct sb_key_dictionary_key) / SB_BLOCK_SIZE;
sb_header->timestamp_us = sb_get_timestamp() * 1000000;
EVP_DigestUpdate(&md_ctx, sb_header->signature1,
sizeof(struct sb_boot_image_header) -
sizeof(sb_header->digest));
EVP_DigestFinal(&md_ctx, sb_header->digest, NULL);
}
static void sb_encrypt_sb_header(
EVP_CIPHER_CTX *cipher_ctx, EVP_MD_CTX *md_ctx,
struct sb_boot_image_header *sb_header)
{
uint8_t *sb_header_ptr = (uint8_t *)sb_header;
/* Fill in the missing parts of the SB image header. */
sb_complete_sb_header();
/* Encrypt the header, compute the digest. */
sb_aes_encrypt(cipher_ctx, sb_header_ptr, NULL, sizeof(*sb_header));
EVP_DigestUpdate(md_ctx, sb_header_ptr, sizeof(*sb_header));
}
static void sb_encrypt_sb_sections_header(
EVP_CIPHER_CTX *cipher_ctx, EVP_MD_CTX *md_ctx,
struct sb_sections_header *sb_sections_header,
uint8_t cbc_mac[sizeof(struct sb_key_dictionary_key)],
int tag_offset)
{
uint8_t *sb_sections_header_ptr = (uint8_t *)sb_sections_header;
const int size = sizeof(*sb_sections_header);
/* Skip the "TAG" instruction. */
sb_sections_header->section_offset = tag_offset + 1;
sb_sections_header->section_size = sb_get_sections_block_size() - 1;
/* Section #0 is bootable. */
sb_sections_header->section_flags = SB_SECTION_FLAG_BOOTABLE;
sb_aes_encrypt(cipher_ctx, sb_sections_header_ptr, cbc_mac, size);
EVP_DigestUpdate(md_ctx, sb_sections_header_ptr, size);
}
static void sb_encrypt_key_dictionary_key(
EVP_CIPHER_CTX *cipher_ctx, EVP_MD_CTX *md_ctx,
struct sb_key_dictionary_key *sb_dict_key,
uint8_t cbc_mac[sizeof(struct sb_key_dictionary_key)])
{
/*
* The key in the key dictionary contains CBC-MAC from the SB image
* header and SB sections header.
*/
memcpy(sb_dict_key->cbc_mac, cbc_mac, sizeof(sb_dict_key->cbc_mac));
sb_aes_encrypt(cipher_ctx, image_key, sb_dict_key->key, 16);
EVP_DigestUpdate(md_ctx, sb_dict_key, sizeof(*sb_dict_key));
}