1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2011 Samsung Electronics
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <stdio.h>
8*4882a593Smuzhiyun #include <stdlib.h>
9*4882a593Smuzhiyun #include <unistd.h>
10*4882a593Smuzhiyun #include <fcntl.h>
11*4882a593Smuzhiyun #include <errno.h>
12*4882a593Smuzhiyun #include <string.h>
13*4882a593Smuzhiyun #include <sys/stat.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #define CHECKSUM_OFFSET (14*1024-4)
16*4882a593Smuzhiyun #define BUFSIZE (16*1024)
17*4882a593Smuzhiyun #define FILE_PERM (S_IRUSR | S_IWUSR | S_IRGRP \
18*4882a593Smuzhiyun | S_IWGRP | S_IROTH | S_IWOTH)
19*4882a593Smuzhiyun /*
20*4882a593Smuzhiyun * Requirement:
21*4882a593Smuzhiyun * IROM code reads first 14K bytes from boot device.
22*4882a593Smuzhiyun * It then calculates the checksum of 14K-4 bytes and compare with data at
23*4882a593Smuzhiyun * 14K-4 offset.
24*4882a593Smuzhiyun *
25*4882a593Smuzhiyun * This function takes two filenames:
26*4882a593Smuzhiyun * IN "u-boot-spl.bin" and
27*4882a593Smuzhiyun * OUT "u-boot-mmc-spl.bin" as filenames.
28*4882a593Smuzhiyun * It reads the "u-boot-spl.bin" in 16K buffer.
29*4882a593Smuzhiyun * It calculates checksum of 14K-4 Bytes and stores at 14K-4 offset in buffer.
30*4882a593Smuzhiyun * It writes the buffer to "u-boot-mmc-spl.bin" file.
31*4882a593Smuzhiyun */
32*4882a593Smuzhiyun
main(int argc,char ** argv)33*4882a593Smuzhiyun int main(int argc, char **argv)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun int i, len;
36*4882a593Smuzhiyun unsigned char buffer[BUFSIZE] = {0};
37*4882a593Smuzhiyun int ifd, ofd;
38*4882a593Smuzhiyun unsigned int checksum = 0, count;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun if (argc != 3) {
41*4882a593Smuzhiyun printf(" %d Wrong number of arguments\n", argc);
42*4882a593Smuzhiyun exit(EXIT_FAILURE);
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun ifd = open(argv[1], O_RDONLY);
46*4882a593Smuzhiyun if (ifd < 0) {
47*4882a593Smuzhiyun fprintf(stderr, "%s: Can't open %s: %s\n",
48*4882a593Smuzhiyun argv[0], argv[1], strerror(errno));
49*4882a593Smuzhiyun exit(EXIT_FAILURE);
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun ofd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, FILE_PERM);
53*4882a593Smuzhiyun if (ofd < 0) {
54*4882a593Smuzhiyun fprintf(stderr, "%s: Can't open %s: %s\n",
55*4882a593Smuzhiyun argv[0], argv[2], strerror(errno));
56*4882a593Smuzhiyun if (ifd)
57*4882a593Smuzhiyun close(ifd);
58*4882a593Smuzhiyun exit(EXIT_FAILURE);
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun len = lseek(ifd, 0, SEEK_END);
62*4882a593Smuzhiyun lseek(ifd, 0, SEEK_SET);
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun count = (len < CHECKSUM_OFFSET) ? len : CHECKSUM_OFFSET;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun if (read(ifd, buffer, count) != count) {
67*4882a593Smuzhiyun fprintf(stderr, "%s: Can't read %s: %s\n",
68*4882a593Smuzhiyun argv[0], argv[1], strerror(errno));
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun if (ifd)
71*4882a593Smuzhiyun close(ifd);
72*4882a593Smuzhiyun if (ofd)
73*4882a593Smuzhiyun close(ofd);
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun exit(EXIT_FAILURE);
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun for (i = 0, checksum = 0; i < CHECKSUM_OFFSET; i++)
79*4882a593Smuzhiyun checksum += buffer[i];
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun memcpy(&buffer[CHECKSUM_OFFSET], &checksum, sizeof(checksum));
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun if (write(ofd, buffer, BUFSIZE) != BUFSIZE) {
84*4882a593Smuzhiyun fprintf(stderr, "%s: Can't write %s: %s\n",
85*4882a593Smuzhiyun argv[0], argv[2], strerror(errno));
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun if (ifd)
88*4882a593Smuzhiyun close(ifd);
89*4882a593Smuzhiyun if (ofd)
90*4882a593Smuzhiyun close(ofd);
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun exit(EXIT_FAILURE);
93*4882a593Smuzhiyun }
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun if (ifd)
96*4882a593Smuzhiyun close(ifd);
97*4882a593Smuzhiyun if (ofd)
98*4882a593Smuzhiyun close(ofd);
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun return EXIT_SUCCESS;
101*4882a593Smuzhiyun }
102