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1da177e4 LT |
1 | /* |
2 | * Makes a tree bootable image for IBM Evaluation boards. | |
3 | * Basically, just take a zImage, skip the ELF header, and stuff | |
4 | * a 32 byte header on the front. | |
5 | * | |
6 | * We use htonl, which is a network macro, to make sure we're doing | |
7 | * The Right Thing on an LE machine. It's non-obvious, but it should | |
8 | * work on anything BSD'ish. | |
9 | */ | |
10 | ||
11 | #include <fcntl.h> | |
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
14 | #include <string.h> | |
15 | #include <sys/stat.h> | |
16 | #include <unistd.h> | |
17 | #include <netinet/in.h> | |
18 | #ifdef __sun__ | |
19 | #include <inttypes.h> | |
20 | #else | |
21 | #include <stdint.h> | |
22 | #endif | |
23 | ||
24 | /* This gets tacked on the front of the image. There are also a few | |
25 | * bytes allocated after the _start label used by the boot rom (see | |
26 | * head.S for details). | |
27 | */ | |
28 | typedef struct boot_block { | |
29 | uint32_t bb_magic; /* 0x0052504F */ | |
30 | uint32_t bb_dest; /* Target address of the image */ | |
31 | uint32_t bb_num_512blocks; /* Size, rounded-up, in 512 byte blks */ | |
32 | uint32_t bb_debug_flag; /* Run debugger or image after load */ | |
33 | uint32_t bb_entry_point; /* The image address to start */ | |
34 | uint32_t bb_checksum; /* 32 bit checksum including header */ | |
35 | uint32_t reserved[2]; | |
36 | } boot_block_t; | |
37 | ||
38 | #define IMGBLK 512 | |
39 | char tmpbuf[IMGBLK]; | |
40 | ||
41 | int main(int argc, char *argv[]) | |
42 | { | |
43 | int in_fd, out_fd; | |
44 | int nblks, i; | |
45 | uint cksum, *cp; | |
46 | struct stat st; | |
47 | boot_block_t bt; | |
48 | ||
49 | if (argc < 3) { | |
50 | fprintf(stderr, "usage: %s <zImage-file> <boot-image> [entry-point]\n",argv[0]); | |
51 | exit(1); | |
52 | } | |
53 | ||
54 | if (stat(argv[1], &st) < 0) { | |
55 | perror("stat"); | |
56 | exit(2); | |
57 | } | |
58 | ||
59 | nblks = (st.st_size + IMGBLK) / IMGBLK; | |
60 | ||
61 | bt.bb_magic = htonl(0x0052504F); | |
62 | ||
63 | /* If we have the optional entry point parameter, use it */ | |
64 | if (argc == 4) | |
65 | bt.bb_dest = bt.bb_entry_point = htonl(strtoul(argv[3], NULL, 0)); | |
66 | else | |
67 | bt.bb_dest = bt.bb_entry_point = htonl(0x500000); | |
68 | ||
69 | /* We know these from the linker command. | |
70 | * ...and then move it up into memory a little more so the | |
71 | * relocation can happen. | |
72 | */ | |
73 | bt.bb_num_512blocks = htonl(nblks); | |
74 | bt.bb_debug_flag = 0; | |
75 | ||
76 | bt.bb_checksum = 0; | |
77 | ||
78 | /* To be neat and tidy :-). | |
79 | */ | |
80 | bt.reserved[0] = 0; | |
81 | bt.reserved[1] = 0; | |
82 | ||
83 | if ((in_fd = open(argv[1], O_RDONLY)) < 0) { | |
84 | perror("zImage open"); | |
85 | exit(3); | |
86 | } | |
87 | ||
88 | if ((out_fd = open(argv[2], (O_RDWR | O_CREAT | O_TRUNC), 0666)) < 0) { | |
89 | perror("bootfile open"); | |
90 | exit(3); | |
91 | } | |
92 | ||
93 | cksum = 0; | |
94 | cp = (void *)&bt; | |
95 | for (i=0; i<sizeof(bt)/sizeof(uint); i++) | |
96 | cksum += *cp++; | |
97 | ||
98 | /* Assume zImage is an ELF file, and skip the 64K header. | |
99 | */ | |
100 | if (read(in_fd, tmpbuf, IMGBLK) != IMGBLK) { | |
101 | fprintf(stderr, "%s is too small to be an ELF image\n", | |
102 | argv[1]); | |
103 | exit(4); | |
104 | } | |
105 | ||
106 | if ((*(uint *)tmpbuf) != htonl(0x7f454c46)) { | |
107 | fprintf(stderr, "%s is not an ELF image\n", argv[1]); | |
108 | exit(4); | |
109 | } | |
110 | ||
111 | if (lseek(in_fd, (64 * 1024), SEEK_SET) < 0) { | |
112 | fprintf(stderr, "%s failed to seek in ELF image\n", argv[1]); | |
113 | exit(4); | |
114 | } | |
115 | ||
116 | nblks -= (64 * 1024) / IMGBLK; | |
117 | ||
118 | /* And away we go...... | |
119 | */ | |
120 | if (write(out_fd, &bt, sizeof(bt)) != sizeof(bt)) { | |
121 | perror("boot-image write"); | |
122 | exit(5); | |
123 | } | |
124 | ||
125 | while (nblks-- > 0) { | |
126 | if (read(in_fd, tmpbuf, IMGBLK) < 0) { | |
127 | perror("zImage read"); | |
128 | exit(5); | |
129 | } | |
130 | cp = (uint *)tmpbuf; | |
131 | for (i=0; i<sizeof(tmpbuf)/sizeof(uint); i++) | |
132 | cksum += *cp++; | |
133 | if (write(out_fd, tmpbuf, sizeof(tmpbuf)) != sizeof(tmpbuf)) { | |
134 | perror("boot-image write"); | |
135 | exit(5); | |
136 | } | |
137 | } | |
138 | ||
139 | /* rewrite the header with the computed checksum. | |
140 | */ | |
141 | bt.bb_checksum = htonl(cksum); | |
142 | if (lseek(out_fd, 0, SEEK_SET) < 0) { | |
143 | perror("rewrite seek"); | |
144 | exit(1); | |
145 | } | |
146 | if (write(out_fd, &bt, sizeof(bt)) != sizeof(bt)) { | |
147 | perror("boot-image rewrite"); | |
148 | exit(1); | |
149 | } | |
150 | ||
151 | exit(0); | |
152 | } |