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/* setmax.c - aeb, 000326 - use on 2.4.0test9 or newer */ /* IBM part thanks to Matan Ziv-Av <matan@svgalib.org> */ /* * Results on Maxtor disks: * The jumper that clips capacity does not influence the value returned * by READ_NATIVE_MAX_ADDRESS, so it is possible to set the jumper * and let the kernel, or a utility (like this one) run at boot time * restore full capacity. * For example, run "setmax -d 0 /dev/hdX" for suitable X. * Kernel patches exist that do the same. * * Results on IBM disks: * The jumper that clips capacity is ruthless. You clipped capacity. * However, if your BIOS hangs on a large disk, do not use the jumper * but find another machine and use a utility (like this one) to * clip the non-volatile max address. * For example, run "setmax -m 66055248 /dev/hdX" for suitable X. * Now go back to your first machine and proceed as with Maxtor drives above. */ #include <stdio.h> #include <fcntl.h> #include <getopt.h> #include <linux/hdreg.h> #ifndef HDIO_DRIVE_CMD_AEB #define HDIO_DRIVE_CMD_AEB 0x031e #endif #define INITIALIZE_DRIVE_PARAMETERS 0x91 #define READ_NATIVE_MAX_ADDRESS 0xf8 #define CHECK_POWER_MODE 0xe5 #define SET_MAX 0xf9 #define LBA 0x40 #define VV 1 /* if set in sectorct then NOT volatile */ struct idecmdin { unsigned char cmd; unsigned char feature; unsigned char nsect; unsigned char sect, lcyl, hcyl; unsigned char select; }; struct idecmdout { unsigned char status; unsigned char error; unsigned char nsect; unsigned char sect, lcyl, hcyl; unsigned char select; }; unsigned int tolba(unsigned char *args) { return ((args[6] & 0xf) << 24) + (args[5] << 16) + (args[4] << 8) + args[3]; } void fromlba(unsigned char *args, unsigned int lba) { args[3] = (lba & 0xff); lba >>= 8; args[4] = (lba & 0xff); lba >>= 8; args[5] = (lba & 0xff); lba >>= 8; args[6] = (args[6] & 0xf0) | (lba & 0xf); } int get_identity(int fd) { unsigned char args[4+512] = {WIN_IDENTIFY,0,0,1,}; struct hd_driveid *id = (struct hd_driveid *)&args[4]; if (ioctl(fd, HDIO_DRIVE_CMD, &args)) { perror("HDIO_DRIVE_CMD"); fprintf(stderr, "WIN_IDENTIFY failed - trying WIN_PIDENTIFY\n"); args[0] = WIN_PIDENTIFY; if (ioctl(fd, HDIO_DRIVE_CMD, &args)) { perror("HDIO_DRIVE_CMD"); fprintf(stderr, "WIN_PIDENTIFY also failed - giving up\n"); exit(1); } } printf("lba capacity: %d sectors (%lld bytes)\n", id->lba_capacity, (long long) id->lba_capacity * 512); } /* * result: in LBA mode precisely what is expected * in CHS mode the correct H and S, and C mod 65536. */ unsigned int get_native_max(int fd, int slave) { unsigned char args[7]; int i, max; for (i=0; i<7; i++) args[i] = 0; args[0] = READ_NATIVE_MAX_ADDRESS; args[6] = (slave ? 0x10 : 0) | LBA; if (ioctl(fd, HDIO_DRIVE_CMD_AEB, &args)) { perror("HDIO_DRIVE_CMD_AEB failed READ_NATIVE_MAX_ADDRESS"); for (i=0; i<7; i++) printf("%d = 0x%x\n", args[i], args[i]); exit(1); } return tolba(args); } /* * SET_MAX_ADDRESS requires immediately preceding READ_NATIVE_MAX_ADDRESS * * On old Maxtor disk: this fails for delta <= 254, succeeds for delta >= 255. * (So, in order to get the last 255*512=130560 bytes back one has to reboot. * Side effect: reset to CurCHS=16383/16/63, CurSects=16514064.) * On new Maxtor disk: this works. * On IBM disk without jumper: this works. */ void set_max_address(int fd, int slave, int delta, int max, int volat) { unsigned char args[7]; int i, nativemax, newmax; nativemax = get_native_max(fd, slave); printf("nativemax=%d (0x%x)\n", nativemax, nativemax); for (i=0; i<7; i++) args[i] = 0; args[0] = SET_MAX; args[1] = 0; args[2] = (volat ? 0 : 1); if (delta != -1) newmax = nativemax-delta; else newmax = max-1; fromlba(args, newmax); args[6] |= LBA; if (ioctl(fd, HDIO_DRIVE_CMD_AEB, &args)) { perror("HDIO_DRIVE_CMD_AEB failed SET_MAX"); for (i=0; i<7; i++) printf("%d = 0x%x\n", args[i], args[i]); exit(1); } } static char short_opts[] = "d:m:"; static const struct option long_opts[] = { { "delta", required_argument, NULL, 'd' }, { "max", required_argument, NULL, 'm' }, { NULL, 0, NULL, 0 } }; static char *usage_txt = "Call: setmax [-d D] [-m M] DEVICE\n" "\n" "The call \"setmax --max M DEVICE\" will do a SET_MAX command\n" "to set the non-volatile max number of accessible sectors to M.\n" "\n" "The call \"setmax --delta D DEVICE\" will do a SET_MAX command\n" "to set the maximum accessible sector number D sectors\n" "below end-of-disk.\n" "\n" "The call \"setmax DEVICE\" will do a READ_NATIVE_MAX_ADDRESS\n" "command, and report the maximum accessible sector number.\n" "\n" "This is IDE-only. Probably DEVICE is /dev/hdx for some x.\n\n"; main(int argc, char **argv){ int fd, c; int delta, max, volat; /* If you modify device, also update slave, if necessary. */ /* The kernel already does this for us since 2.4.0test9. */ /* master: hda, hdc, hde; slave: hdb, hdd, hdf */ char *device = NULL; /* e.g. "/dev/hda" */ int slave = 0; delta = max = volat = -1; while ((c = getopt_long (argc, argv, short_opts, long_opts, NULL)) != -1) { switch(c) { case 'd': delta = atoi(optarg); volat = 1; break; case 'm': max = atoi(optarg); volat = 0; break; case '?': default: fprintf(stderr, "unknown option\n"); fprintf(stderr, usage_txt); exit(1); } } if (optind < argc) device = argv[optind]; if (!device) { fprintf(stderr, "no device specified - " "use e.g. \"setmax /dev/hdb\"\n"); fprintf(stderr, usage_txt); exit(1); } printf("Using device %s\n", device); fd = open(device, O_RDONLY); if (fd == -1) { perror("open"); exit(1); } if (delta != -1 || max != -1) { if (delta != -1) printf("setting delta=%d\n", delta); else printf("setting max=%d\n", max); set_max_address(fd, slave, delta, max, volat); } else { int mad = get_native_max(fd, slave); long long bytes = (long long) (mad+1) * 512; int hMB = (bytes+50000000)/100000000; printf("native max address: %d\n", mad); printf("that is %lld bytes, %d.%d GB\n", bytes, hMB/10, hMB%10); } get_identity(fd); return 0; } |