/*
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* Copyright (C) 2012 Samsung Electronics
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <compiler.h>
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#define CHECKSUM_OFFSET (14*1024-4)
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#define FILE_PERM (S_IRUSR | S_IWUSR | S_IRGRP \
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| S_IWGRP | S_IROTH | S_IWOTH)
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/*
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* Requirement for the fixed size SPL header:
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* IROM code reads first (CHECKSUM_OFFSET + 4) bytes from boot device. It then
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* calculates the checksum of CHECKSUM_OFFSET bytes and compares with data at
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* CHECKSUM_OFFSET location.
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*
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* Requirement for the variable size SPL header:
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* IROM code reads the below header to find out the size of the blob (total
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* size, header size included) and its checksum. Then it reads the rest of the
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* blob [i.e size - sizeof(struct var_size_header) bytes], calculates the
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* checksum and compares it with value read from the header.
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*/
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struct var_size_header {
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uint32_t spl_size;
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uint32_t spl_checksum;
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uint32_t reserved[2];
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};
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static const char *prog_name;
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static void write_to_file(int ofd, void *buffer, int size)
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{
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if (write(ofd, buffer, size) == size)
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return;
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fprintf(stderr, "%s: Failed to write to output file: %s\n",
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prog_name, strerror(errno));
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exit(EXIT_FAILURE);
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}
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/*
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* The argv is expected to include one optional parameter and two filenames:
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* [--vs] IN OUT
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*
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* --vs - turns on the variable size SPL mode
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* IN - the u-boot SPL binary, usually u-boot-spl.bin
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* OUT - the prepared SPL blob, usually ${BOARD}-spl.bin
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*
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* This utility first reads the "u-boot-spl.bin" into a buffer. In case of
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* fixed size SPL the buffer size is exactly CHECKSUM_OFFSET (such that
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* smaller u-boot-spl.bin gets padded with 0xff bytes, the larger than limit
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* u-boot-spl.bin causes an error). For variable size SPL the buffer size is
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* eqaul to size of the IN file.
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*
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* Then it calculates checksum of the buffer by just summing up all bytes.
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* Then
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*
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* - for fixed size SPL the buffer is written into the output file and the
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* checksum is appended to the file in little endian format, which results
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* in checksum added exactly at CHECKSUM_OFFSET.
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*
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* - for variable size SPL the checksum and file size are stored in the
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* var_size_header structure (again, in little endian format) and the
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* structure is written into the output file. Then the buffer is written
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* into the output file.
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*/
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int main(int argc, char **argv)
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{
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unsigned char *buffer;
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int i, ifd, ofd;
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uint32_t checksum = 0;
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off_t len;
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int var_size_flag, read_size, count;
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struct stat stat;
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const int if_index = argc - 2; /* Input file name index in argv. */
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const int of_index = argc - 1; /* Output file name index in argv. */
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/* Strip path off the program name. */
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prog_name = strrchr(argv[0], '/');
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if (prog_name)
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prog_name++;
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else
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prog_name = argv[0];
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if ((argc < 3) ||
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(argc > 4) ||
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((argc == 4) && strcmp(argv[1], "--vs"))) {
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fprintf(stderr, "Usage: %s [--vs] <infile> <outfile>\n",
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prog_name);
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exit(EXIT_FAILURE);
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}
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/* four args mean variable size SPL wrapper is required */
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var_size_flag = (argc == 4);
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ifd = open(argv[if_index], O_RDONLY);
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if (ifd < 0) {
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fprintf(stderr, "%s: Can't open %s: %s\n",
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prog_name, argv[if_index], strerror(errno));
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exit(EXIT_FAILURE);
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}
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ofd = open(argv[of_index], O_WRONLY | O_CREAT | O_TRUNC, FILE_PERM);
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if (ofd < 0) {
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fprintf(stderr, "%s: Can't open %s: %s\n",
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prog_name, argv[of_index], strerror(errno));
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exit(EXIT_FAILURE);
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}
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if (fstat(ifd, &stat)) {
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fprintf(stderr, "%s: Unable to get size of %s: %s\n",
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prog_name, argv[if_index], strerror(errno));
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exit(EXIT_FAILURE);
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}
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len = stat.st_size;
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if (var_size_flag) {
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read_size = len;
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count = len;
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} else {
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if (len > CHECKSUM_OFFSET) {
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fprintf(stderr,
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"%s: %s is too big (exceeds %d bytes)\n",
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prog_name, argv[if_index], CHECKSUM_OFFSET);
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exit(EXIT_FAILURE);
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}
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count = CHECKSUM_OFFSET;
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read_size = len;
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}
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buffer = malloc(count);
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if (!buffer) {
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fprintf(stderr,
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"%s: Failed to allocate %d bytes to store %s\n",
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prog_name, count, argv[if_index]);
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exit(EXIT_FAILURE);
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}
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if (read(ifd, buffer, read_size) != read_size) {
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fprintf(stderr, "%s: Can't read %s: %s\n",
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prog_name, argv[if_index], strerror(errno));
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exit(EXIT_FAILURE);
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}
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/* Pad if needed with 0xff to make flashing faster. */
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if (read_size < count)
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memset((char *)buffer + read_size, 0xff, count - read_size);
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for (i = 0, checksum = 0; i < count; i++)
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checksum += buffer[i];
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checksum = cpu_to_le32(checksum);
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if (var_size_flag) {
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/* Prepare and write out the variable size SPL header. */
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struct var_size_header vsh;
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uint32_t spl_size;
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memset(&vsh, 0, sizeof(vsh));
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memcpy(&vsh.spl_checksum, &checksum, sizeof(checksum));
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spl_size = cpu_to_le32(count + sizeof(struct var_size_header));
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memcpy(&vsh.spl_size, &spl_size, sizeof(spl_size));
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write_to_file(ofd, &vsh, sizeof(vsh));
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}
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write_to_file(ofd, buffer, count);
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/* For fixed size SPL checksum is appended in the end. */
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if (!var_size_flag)
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write_to_file(ofd, &checksum, sizeof(checksum));
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close(ifd);
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close(ofd);
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free(buffer);
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return EXIT_SUCCESS;
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}
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