mirror of
https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
187 lines
5.1 KiB
C
187 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2012 Samsung Electronics
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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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