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1.1.1.2 root 1: /*
2: * linux/tools/build.c
3: *
4: * (C) 1991 Linus Torvalds
5: */
6:
7: /*
8: * This file builds a disk-image from three different files:
9: *
10: * - bootsect: max 510 bytes of 8086 machine code, loads the rest
11: * - setup: max 4 sectors of 8086 machine code, sets up system parm
12: * - system: 80386 code for actual system
13: *
14: * It does some checking that all files are of the correct type, and
15: * just writes the result to stdout, removing headers and padding to
16: * the right amount. It also writes some system data to stderr.
17: */
18:
1.1.1.3 root 19: /*
20: * Changes by tytso to allow root device specification
1.1.1.4 ! root 21: *
! 22: * Added swap-device specification: Linux 20.12.91
1.1.1.3 root 23: */
24:
1.1 root 25: #include <stdio.h> /* fprintf */
1.1.1.2 root 26: #include <string.h>
1.1 root 27: #include <stdlib.h> /* contains exit */
28: #include <sys/types.h> /* unistd.h needs this */
1.1.1.2 root 29: #include <sys/stat.h>
30: #include <linux/fs.h>
1.1 root 31: #include <unistd.h> /* contains read/write */
32: #include <fcntl.h>
33:
34: #define MINIX_HEADER 32
35: #define GCC_HEADER 1024
36:
1.1.1.4 ! root 37: #define SYS_SIZE 0x3000
1.1.1.3 root 38:
1.1.1.2 root 39: #define DEFAULT_MAJOR_ROOT 3
40: #define DEFAULT_MINOR_ROOT 6
41:
1.1.1.4 ! root 42: #define DEFAULT_MAJOR_SWAP 0
! 43: #define DEFAULT_MINOR_SWAP 0
! 44:
1.1.1.2 root 45: /* max nr of sectors of setup: don't change unless you also change
46: * bootsect etc */
47: #define SETUP_SECTS 4
48:
49: #define STRINGIFY(x) #x
50:
1.1 root 51: void die(char * str)
52: {
53: fprintf(stderr,"%s\n",str);
54: exit(1);
55: }
56:
57: void usage(void)
58: {
1.1.1.3 root 59: die("Usage: build bootsect setup system [rootdev] [> image]");
1.1 root 60: }
61:
62: int main(int argc, char ** argv)
63: {
64: int i,c,id;
65: char buf[1024];
1.1.1.2 root 66: char major_root, minor_root;
1.1.1.4 ! root 67: char major_swap, minor_swap;
1.1.1.2 root 68: struct stat sb;
1.1 root 69:
1.1.1.4 ! root 70: if ((argc < 4) || (argc > 6))
1.1 root 71: usage();
1.1.1.4 ! root 72: if (argc > 4) {
1.1.1.2 root 73: if (strcmp(argv[4], "FLOPPY")) {
74: if (stat(argv[4], &sb)) {
75: perror(argv[4]);
76: die("Couldn't stat root device.");
77: }
78: major_root = MAJOR(sb.st_rdev);
79: minor_root = MINOR(sb.st_rdev);
80: } else {
81: major_root = 0;
82: minor_root = 0;
83: }
84: } else {
85: major_root = DEFAULT_MAJOR_ROOT;
86: minor_root = DEFAULT_MINOR_ROOT;
87: }
1.1.1.4 ! root 88: if (argc == 6) {
! 89: if (strcmp(argv[5], "NONE")) {
! 90: if (stat(argv[5], &sb)) {
! 91: perror(argv[5]);
! 92: die("Couldn't stat root device.");
! 93: }
! 94: major_swap = MAJOR(sb.st_rdev);
! 95: minor_swap = MINOR(sb.st_rdev);
! 96: } else {
! 97: major_swap = 0;
! 98: minor_swap = 0;
! 99: }
! 100: } else {
! 101: major_swap = DEFAULT_MAJOR_SWAP;
! 102: minor_swap = DEFAULT_MINOR_SWAP;
! 103: }
1.1.1.2 root 104: fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root);
1.1.1.4 ! root 105: fprintf(stderr, "Swap device is (%d, %d)\n", major_swap, minor_swap);
1.1.1.2 root 106: if ((major_root != 2) && (major_root != 3) &&
107: (major_root != 0)) {
108: fprintf(stderr, "Illegal root device (major = %d)\n",
109: major_root);
110: die("Bad root device --- major #");
111: }
1.1.1.4 ! root 112: if (major_swap && major_swap != 3) {
! 113: fprintf(stderr, "Illegal swap device (major = %d)\n",
! 114: major_swap);
! 115: die("Bad root device --- major #");
! 116: }
1.1 root 117: for (i=0;i<sizeof buf; i++) buf[i]=0;
118: if ((id=open(argv[1],O_RDONLY,0))<0)
119: die("Unable to open 'boot'");
120: if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
121: die("Unable to read header of 'boot'");
122: if (((long *) buf)[0]!=0x04100301)
123: die("Non-Minix header of 'boot'");
124: if (((long *) buf)[1]!=MINIX_HEADER)
125: die("Non-Minix header of 'boot'");
126: if (((long *) buf)[3]!=0)
127: die("Illegal data segment in 'boot'");
128: if (((long *) buf)[4]!=0)
129: die("Illegal bss in 'boot'");
130: if (((long *) buf)[5] != 0)
131: die("Non-Minix header of 'boot'");
132: if (((long *) buf)[7] != 0)
133: die("Illegal symbol table in 'boot'");
134: i=read(id,buf,sizeof buf);
135: fprintf(stderr,"Boot sector %d bytes.\n",i);
1.1.1.2 root 136: if (i != 512)
137: die("Boot block must be exactly 512 bytes");
138: if ((*(unsigned short *)(buf+510)) != 0xAA55)
139: die("Boot block hasn't got boot flag (0xAA55)");
1.1.1.4 ! root 140: buf[506] = (char) minor_swap;
! 141: buf[507] = (char) major_swap;
1.1.1.2 root 142: buf[508] = (char) minor_root;
143: buf[509] = (char) major_root;
1.1 root 144: i=write(1,buf,512);
145: if (i!=512)
146: die("Write call failed");
147: close (id);
148:
149: if ((id=open(argv[2],O_RDONLY,0))<0)
1.1.1.2 root 150: die("Unable to open 'setup'");
151: if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
152: die("Unable to read header of 'setup'");
153: if (((long *) buf)[0]!=0x04100301)
154: die("Non-Minix header of 'setup'");
155: if (((long *) buf)[1]!=MINIX_HEADER)
156: die("Non-Minix header of 'setup'");
157: if (((long *) buf)[3]!=0)
158: die("Illegal data segment in 'setup'");
159: if (((long *) buf)[4]!=0)
160: die("Illegal bss in 'setup'");
161: if (((long *) buf)[5] != 0)
162: die("Non-Minix header of 'setup'");
163: if (((long *) buf)[7] != 0)
164: die("Illegal symbol table in 'setup'");
165: for (i=0 ; (c=read(id,buf,sizeof buf))>0 ; i+=c )
166: if (write(1,buf,c)!=c)
167: die("Write call failed");
168: close (id);
169: if (i > SETUP_SECTS*512)
170: die("Setup exceeds " STRINGIFY(SETUP_SECTS)
171: " sectors - rewrite build/boot/setup");
172: fprintf(stderr,"Setup is %d bytes.\n",i);
173: for (c=0 ; c<sizeof(buf) ; c++)
174: buf[c] = '\0';
175: while (i<SETUP_SECTS*512) {
176: c = SETUP_SECTS*512-i;
177: if (c > sizeof(buf))
178: c = sizeof(buf);
179: if (write(1,buf,c) != c)
180: die("Write call failed");
181: i += c;
182: }
183:
184: if ((id=open(argv[3],O_RDONLY,0))<0)
1.1 root 185: die("Unable to open 'system'");
186: if (read(id,buf,GCC_HEADER) != GCC_HEADER)
187: die("Unable to read header of 'system'");
188: if (((long *) buf)[5] != 0)
189: die("Non-GCC header of 'system'");
190: for (i=0 ; (c=read(id,buf,sizeof buf))>0 ; i+=c )
191: if (write(1,buf,c)!=c)
192: die("Write call failed");
193: close(id);
1.1.1.2 root 194: fprintf(stderr,"System is %d bytes.\n",i);
1.1.1.3 root 195: if (i > SYS_SIZE*16)
196: die("System is too big");
1.1 root 197: return(0);
198: }
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