1 /* $NetBSD: chg_pid.c,v 1.9 2009/10/20 19:10:11 snj Exp $ */ 2 3 /* 4 * Copyright (c) 1995 L. Weppelman 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 /* 29 * 30 * This program changes the partition id field (p_id) in the GEM 31 * partition info. NetBSD uses these id-fields to determine the kind 32 * of partition. Sensible id's to set are: 33 * NBU : NetBSD User partition 34 * NBR : NetBSD Root partition 35 * NBS : NetBSD Swap partition 36 * NBD : General NetBSD partition 37 * RAW : Partition hidden for GEMDOS 38 * 39 * When NetBSD auto boots, the first 'NBR' partition found when scanning the 40 * SCSI-disks becomes the active root partition. The same goes for 'NBS'. 41 * Drives are scanned in 'SCSI-id' order. 42 */ 43 #include <sys/types.h> 44 #include <osbind.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 #include <stdio.h> 49 #include "libtos.h" 50 51 #ifndef Dmawrite 52 #define Dmawrite DMAwrite 53 #endif 54 #ifndef Dmaread 55 #define Dmaread DMAread 56 #endif 57 58 /* 59 * Format of GEM root sector 60 */ 61 typedef struct gem_part { 62 u_char p_flg; /* bit 0 is in-use flag */ 63 char p_id[3]; /* id: GEM, BGM, XGM, UNX, MIX */ 64 u_long p_st; /* block where partition starts */ 65 u_long p_size; /* partition size */ 66 } GEM_PART; 67 68 /* 69 * Defines for p_flg 70 */ 71 #define P_VALID 0x01 /* info is valid */ 72 #define P_ACTIVE 0x80 /* partition is active */ 73 74 #define NGEM_PARTS 4 /* Max. partition infos in root sector */ 75 76 typedef struct gem_root { 77 u_char fill[0x1c2]; /* Filler, can be boot code */ 78 u_long hd_siz; /* size of entire volume */ 79 GEM_PART parts[NGEM_PARTS]; /* see above */ 80 u_long bsl_st; /* start of bad-sector list */ 81 u_long bsl_cnt; /* nr. blocks in bad-sector list*/ 82 u_short csum; /* checksum correction */ 83 } GEM_ROOT; 84 85 void help PROTO((void)); 86 void usage PROTO((void)); 87 int chg_tosparts PROTO((int, int, char *)); 88 void change_it PROTO((int, GEM_PART *, char *)); 89 int read_block PROTO((void *, int, int)); 90 int write_block PROTO((void *, int, int)); 91 void set_csum PROTO((char *)); 92 93 const char version[] = "$Revision: 1.9 $"; 94 95 char *Progname = NULL; /* What are we called */ 96 int t_flag = 0; /* Test -- don't actually do it */ 97 int v_flag = 0; /* show version */ 98 int h_flag = 0; /* show help */ 99 100 int 101 main(int argc, char *argv[]) 102 { 103 /* 104 * Option parsing 105 */ 106 extern int optind; 107 extern char *optarg; 108 109 int driveno = 0; 110 int partno = 0; 111 char *newname = NULL; 112 int c; 113 114 init_toslib(argv[0]); 115 Progname = argv[0]; 116 117 while ((c = getopt(argc, argv, "htVwo:")) != -1) { 118 switch (c) { 119 case 'h': 120 h_flag = 1; 121 break; 122 case 'o': 123 redirect_output(optarg); 124 break; 125 case 't': 126 t_flag = 1; 127 break; 128 case 'V': 129 v_flag = 1; 130 break; 131 case 'w': 132 set_wait_for_key(); 133 break; 134 default: 135 usage(); 136 } 137 } 138 argc -= optind; 139 argv += optind; 140 141 if (h_flag) 142 help(); 143 144 if (v_flag) { 145 eprintf("%s\r\n", version); 146 if (argc != 3) 147 xexit(0); 148 } 149 150 if (argc != 3) 151 usage(); 152 153 eprintf("Note: >>> Both drive and partition numbers start " 154 "at 0! <<<\r\n"); 155 156 driveno = atoi(argv[0]); 157 partno = atoi(argv[1]); 158 newname = argv[2]; 159 eprintf("About to change id of partition %d on drive %d to %s\r\n", 160 partno, driveno, newname); 161 162 if (!t_flag) 163 c = key_wait("Are you sure (y/n)? "); 164 else c = 'y'; 165 switch(c) { 166 case 'y': 167 case 'Y': 168 if(chg_tosparts(partno, driveno, newname)) { 169 if (!t_flag) 170 eprintf("Done\r\n"); 171 else eprintf("Not Done\r\n"); 172 xexit(0); 173 } 174 else eprintf("Partition number not found\r\n"); 175 break; 176 default : 177 eprintf("Aborted\r\n"); 178 xexit(1); 179 break; 180 } 181 xexit(0); 182 } 183 184 int chg_tosparts(chg_part, drive, newname) 185 int chg_part, drive; 186 char *newname; 187 { 188 GEM_ROOT *g_root; 189 GEM_PART g_local[NGEM_PARTS]; 190 char buf[512]; 191 int pno = 0; 192 int i; 193 194 /* 195 * Read root sector 196 */ 197 if (read_block(buf, 0, drive) == 0) 198 fatal(-1, "Cannot read block 0\r\n"); 199 200 /* 201 * Make local copy of partition info, we may need to re-use 202 * the buffer in case of 'XGM' partitions. 203 */ 204 g_root = (GEM_ROOT*)buf; 205 memcpy(g_local, g_root->parts, NGEM_PARTS*sizeof(GEM_PART)); 206 207 for (i = 0; i < NGEM_PARTS; i++) { 208 if (!(g_local[i].p_flg & 1)) 209 continue; 210 if (!strncmp(g_local[i].p_id, "XGM", 3)) { 211 int j; 212 daddr_t new_root = g_local[i].p_st; 213 214 /* 215 * Loop through extended partition list 216 */ 217 for(;;) { 218 if (read_block(buf, new_root, drive) == 0) 219 fatal(-1, "Cannot read block %d\r\n", new_root); 220 for (j = 0; j < NGEM_PARTS; j++) { 221 if (!(g_root->parts[j].p_flg & 1)) 222 continue; 223 if (!strncmp(g_root->parts[j].p_id, "XGM", 3)) { 224 new_root = g_local[i].p_st + g_root->parts[j].p_st; 225 break; 226 } 227 else { 228 if (pno == chg_part) { 229 change_it(pno, &g_root->parts[j], newname); 230 if (t_flag) 231 return(1); 232 if (write_block(buf, new_root, drive) == 0) 233 fatal(-1, "Cannot write block %d\r\n",new_root); 234 return(1); 235 } 236 pno++; 237 } 238 } 239 if (j == NGEM_PARTS) 240 break; 241 } 242 } 243 else { 244 if (pno == chg_part) { 245 /* 246 * Re-read block 0 247 */ 248 if (read_block(buf, 0, drive) == 0) 249 fatal(-1, "Cannot read block 0\r\n"); 250 change_it(pno, &g_root->parts[i], newname); 251 if (t_flag) 252 return(1); 253 set_csum(buf); 254 if (write_block(buf, 0, drive) == 0) 255 fatal(-1, "Cannot write block 0\r\n"); 256 return(1); 257 } 258 pno++; 259 } 260 } 261 return(0); 262 } 263 264 void change_it(pno, gp, newname) 265 int pno; 266 GEM_PART *gp; 267 char *newname; 268 { 269 char s1[4], s2[4]; 270 271 strncpy(s1, gp->p_id, 3); 272 strncpy(s2, newname, 3); 273 s1[3] = s2[3] = '\0'; 274 eprintf("Changing partition %d: %s -> %s ...", pno, s1, s2); 275 gp->p_id[0] = s2[0]; gp->p_id[1] = s2[1]; gp->p_id[2] = s2[2]; 276 } 277 278 int read_block(buf, blkno, drive) 279 void *buf; 280 int blkno; 281 int drive; 282 { 283 if(Dmaread(blkno, 1, buf, drive + 8) != 0) 284 return(0); 285 return(1); 286 } 287 288 int write_block(buf, blkno, drive) 289 void *buf; 290 int blkno; 291 int drive; 292 { 293 if(Dmawrite(blkno, 1, buf, drive + 8) != 0) 294 return(0); 295 return(1); 296 } 297 298 void set_csum(buf) 299 char *buf; 300 { 301 unsigned short *p = (unsigned short *)buf; 302 unsigned short csum = 0; 303 int i; 304 305 p[255] = 0; 306 for(i = 0; i < 256; i++) 307 csum += *p++; 308 *--p = (0x1234 - csum) & 0xffff; 309 } 310 311 void usage(void) 312 { 313 eprintf("Usage: %s [-hVwt] [ -o <output file>] <driveno> <partno> " 314 "<newid>\r\n", Progname); 315 xexit(1); 316 } 317 318 void 319 help(void) 320 { 321 eprintf("\r 322 Change partition identifiers\r 323 \r 324 Usage: %s [-hVwt] [ -o <output file>] <driveno> <partno> <newid>\r 325 \r 326 Description of options:\r 327 \r 328 \t-h What you're getting right now.\r 329 \t-o Write output to both <output file> and stdout.\r 330 \t-V Print program version.\r 331 \t-w Wait for a keypress before exiting.\r 332 \t-t Test mode. It does everyting except the modifications on disk.\r 333 \r 334 The <driveno> and <partno> arguments specify the drive and the partition\r 335 this program acts on. Both are zero based.\r 336 The <newid> argument specifies a 3 letter string that will become the new\r 337 partition-id.\r 338 Finally note that the actions of %s are reversable.\r 339 ", Progname, Progname); 340 xexit(0); 341 } 342