md.c revision 1.70
1 /* $NetBSD: md.c,v 1.70 2014/07/25 08:02:19 dholland Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Gordon W. Ross, Leo 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 * This implements a general-purpose memory-disk. 30 * See md.h for notes on the config types. 31 * 32 * Note that this driver provides the same functionality 33 * as the MFS filesystem hack, but this is better because 34 * you can use this for any filesystem type you'd like! 35 * 36 * Credit for most of the kmem ramdisk code goes to: 37 * Leo Weppelman (atari) and Phil Nelson (pc532) 38 * Credit for the ideas behind the "user space memory" code goes 39 * to the authors of the MFS implementation. 40 */ 41 42 #include <sys/cdefs.h> 43 __KERNEL_RCSID(0, "$NetBSD: md.c,v 1.70 2014/07/25 08:02:19 dholland Exp $"); 44 45 #ifdef _KERNEL_OPT 46 #include "opt_md.h" 47 #else 48 #define MEMORY_DISK_SERVER 1 49 #endif 50 51 #include <sys/param.h> 52 #include <sys/kernel.h> 53 #include <sys/malloc.h> 54 #include <sys/systm.h> 55 #include <sys/buf.h> 56 #include <sys/bufq.h> 57 #include <sys/device.h> 58 #include <sys/disk.h> 59 #include <sys/stat.h> 60 #include <sys/proc.h> 61 #include <sys/conf.h> 62 #include <sys/disklabel.h> 63 64 #include <uvm/uvm_extern.h> 65 66 #include <dev/md.h> 67 68 /* 69 * The user-space functionality is included by default. 70 * Use `options MEMORY_DISK_SERVER=0' to turn it off. 71 */ 72 #ifndef MEMORY_DISK_SERVER 73 #error MEMORY_DISK_SERVER should be defined by opt_md.h 74 #endif /* MEMORY_DISK_SERVER */ 75 76 /* 77 * We should use the raw partition for ioctl. 78 */ 79 #define MD_UNIT(unit) DISKUNIT(unit) 80 81 /* autoconfig stuff... */ 82 83 struct md_softc { 84 device_t sc_dev; /* Self. */ 85 struct disk sc_dkdev; /* hook for generic disk handling */ 86 struct md_conf sc_md; 87 kmutex_t sc_lock; /* Protect self. */ 88 kcondvar_t sc_cv; /* Wait here for work. */ 89 struct bufq_state *sc_buflist; 90 }; 91 /* shorthand for fields in sc_md: */ 92 #define sc_addr sc_md.md_addr 93 #define sc_size sc_md.md_size 94 #define sc_type sc_md.md_type 95 96 void mdattach(int); 97 98 static void md_attach(device_t, device_t, void *); 99 static int md_detach(device_t, int); 100 101 static dev_type_open(mdopen); 102 static dev_type_close(mdclose); 103 static dev_type_read(mdread); 104 static dev_type_write(mdwrite); 105 static dev_type_ioctl(mdioctl); 106 static dev_type_strategy(mdstrategy); 107 static dev_type_size(mdsize); 108 109 const struct bdevsw md_bdevsw = { 110 .d_open = mdopen, 111 .d_close = mdclose, 112 .d_strategy = mdstrategy, 113 .d_ioctl = mdioctl, 114 .d_dump = nodump, 115 .d_psize = mdsize, 116 .d_discard = nodiscard, 117 .d_flag = D_DISK | D_MPSAFE 118 }; 119 120 const struct cdevsw md_cdevsw = { 121 .d_open = mdopen, 122 .d_close = mdclose, 123 .d_read = mdread, 124 .d_write = mdwrite, 125 .d_ioctl = mdioctl, 126 .d_stop = nostop, 127 .d_tty = notty, 128 .d_poll = nopoll, 129 .d_mmap = nommap, 130 .d_kqfilter = nokqfilter, 131 .d_flag = D_DISK 132 }; 133 134 static struct dkdriver mddkdriver = { mdstrategy, NULL }; 135 136 extern struct cfdriver md_cd; 137 CFATTACH_DECL3_NEW(md, sizeof(struct md_softc), 138 0, md_attach, md_detach, NULL, NULL, NULL, DVF_DETACH_SHUTDOWN); 139 140 static kmutex_t md_device_lock; /* Protect unit creation / deletion. */ 141 extern size_t md_root_size; 142 143 static void md_set_disklabel(struct md_softc *); 144 145 /* 146 * This is called if we are configured as a pseudo-device 147 */ 148 void 149 mdattach(int n) 150 { 151 152 mutex_init(&md_device_lock, MUTEX_DEFAULT, IPL_NONE); 153 if (config_cfattach_attach(md_cd.cd_name, &md_ca)) { 154 aprint_error("%s: cfattach_attach failed\n", md_cd.cd_name); 155 return; 156 } 157 } 158 159 static void 160 md_attach(device_t parent, device_t self, void *aux) 161 { 162 struct md_softc *sc = device_private(self); 163 164 sc->sc_dev = self; 165 sc->sc_type = MD_UNCONFIGURED; 166 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 167 cv_init(&sc->sc_cv, "mdidle"); 168 bufq_alloc(&sc->sc_buflist, "fcfs", 0); 169 170 /* XXX - Could accept aux info here to set the config. */ 171 #ifdef MEMORY_DISK_HOOKS 172 /* 173 * This external function might setup a pre-loaded disk. 174 * All it would need to do is setup the md_conf struct. 175 * See sys/dev/md_root.c for an example. 176 */ 177 md_attach_hook(device_unit(self), &sc->sc_md); 178 #endif 179 180 /* 181 * Initialize and attach the disk structure. 182 */ 183 disk_init(&sc->sc_dkdev, device_xname(self), &mddkdriver); 184 disk_attach(&sc->sc_dkdev); 185 186 if (sc->sc_type != MD_UNCONFIGURED) 187 md_set_disklabel(sc); 188 189 if (!pmf_device_register(self, NULL, NULL)) 190 aprint_error_dev(self, "couldn't establish power handler\n"); 191 } 192 193 static int 194 md_detach(device_t self, int flags) 195 { 196 struct md_softc *sc = device_private(self); 197 int rc; 198 199 rc = 0; 200 mutex_enter(&sc->sc_dkdev.dk_openlock); 201 if (sc->sc_dkdev.dk_openmask == 0 && sc->sc_type == MD_UNCONFIGURED) 202 ; /* nothing to do */ 203 else if ((flags & DETACH_FORCE) == 0) 204 rc = EBUSY; 205 mutex_exit(&sc->sc_dkdev.dk_openlock); 206 207 if (rc != 0) 208 return rc; 209 210 pmf_device_deregister(self); 211 disk_detach(&sc->sc_dkdev); 212 disk_destroy(&sc->sc_dkdev); 213 bufq_free(sc->sc_buflist); 214 mutex_destroy(&sc->sc_lock); 215 cv_destroy(&sc->sc_cv); 216 return 0; 217 } 218 219 /* 220 * operational routines: 221 * open, close, read, write, strategy, 222 * ioctl, dump, size 223 */ 224 225 #if MEMORY_DISK_SERVER 226 static int md_server_loop(struct md_softc *sc); 227 static int md_ioctl_server(struct md_softc *sc, struct md_conf *umd, 228 struct lwp *l); 229 #endif /* MEMORY_DISK_SERVER */ 230 static int md_ioctl_kalloc(struct md_softc *sc, struct md_conf *umd, 231 struct lwp *l); 232 233 static int 234 mdsize(dev_t dev) 235 { 236 struct md_softc *sc; 237 int res; 238 239 sc = device_lookup_private(&md_cd, MD_UNIT(dev)); 240 if (sc == NULL) 241 return 0; 242 243 mutex_enter(&sc->sc_lock); 244 if (sc->sc_type == MD_UNCONFIGURED) 245 res = 0; 246 else 247 res = sc->sc_size >> DEV_BSHIFT; 248 mutex_exit(&sc->sc_lock); 249 250 return res; 251 } 252 253 static int 254 mdopen(dev_t dev, int flag, int fmt, struct lwp *l) 255 { 256 int unit; 257 int part = DISKPART(dev); 258 int pmask = 1 << part; 259 cfdata_t cf; 260 struct md_softc *sc; 261 struct disk *dk; 262 #ifdef MEMORY_DISK_HOOKS 263 bool configured; 264 #endif 265 266 mutex_enter(&md_device_lock); 267 unit = MD_UNIT(dev); 268 sc = device_lookup_private(&md_cd, unit); 269 if (sc == NULL) { 270 if (part != RAW_PART) { 271 mutex_exit(&md_device_lock); 272 return ENXIO; 273 } 274 cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK); 275 cf->cf_name = md_cd.cd_name; 276 cf->cf_atname = md_cd.cd_name; 277 cf->cf_unit = unit; 278 cf->cf_fstate = FSTATE_STAR; 279 sc = device_private(config_attach_pseudo(cf)); 280 if (sc == NULL) { 281 mutex_exit(&md_device_lock); 282 return ENOMEM; 283 } 284 } 285 286 dk = &sc->sc_dkdev; 287 288 /* 289 * The raw partition is used for ioctl to configure. 290 */ 291 if (part == RAW_PART) 292 goto ok; 293 294 #ifdef MEMORY_DISK_HOOKS 295 /* Call the open hook to allow loading the device. */ 296 configured = (sc->sc_type != MD_UNCONFIGURED); 297 md_open_hook(unit, &sc->sc_md); 298 /* initialize disklabel if the device is configured in open hook */ 299 if (!configured && sc->sc_type != MD_UNCONFIGURED) 300 md_set_disklabel(sc); 301 #endif 302 303 /* 304 * This is a normal, "slave" device, so 305 * enforce initialized. 306 */ 307 if (sc->sc_type == MD_UNCONFIGURED) { 308 mutex_exit(&md_device_lock); 309 return ENXIO; 310 } 311 312 ok: 313 /* XXX duplicates code in dk_open(). Call dk_open(), instead? */ 314 mutex_enter(&dk->dk_openlock); 315 /* Mark our unit as open. */ 316 switch (fmt) { 317 case S_IFCHR: 318 dk->dk_copenmask |= pmask; 319 break; 320 case S_IFBLK: 321 dk->dk_bopenmask |= pmask; 322 break; 323 } 324 325 dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask; 326 327 mutex_exit(&dk->dk_openlock); 328 mutex_exit(&md_device_lock); 329 return 0; 330 } 331 332 static int 333 mdclose(dev_t dev, int flag, int fmt, struct lwp *l) 334 { 335 int part = DISKPART(dev); 336 int pmask = 1 << part; 337 int error; 338 cfdata_t cf; 339 struct md_softc *sc; 340 struct disk *dk; 341 342 sc = device_lookup_private(&md_cd, MD_UNIT(dev)); 343 if (sc == NULL) 344 return ENXIO; 345 346 dk = &sc->sc_dkdev; 347 348 mutex_enter(&dk->dk_openlock); 349 350 switch (fmt) { 351 case S_IFCHR: 352 dk->dk_copenmask &= ~pmask; 353 break; 354 case S_IFBLK: 355 dk->dk_bopenmask &= ~pmask; 356 break; 357 } 358 dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask; 359 if (dk->dk_openmask != 0) { 360 mutex_exit(&dk->dk_openlock); 361 return 0; 362 } 363 364 mutex_exit(&dk->dk_openlock); 365 366 mutex_enter(&md_device_lock); 367 cf = device_cfdata(sc->sc_dev); 368 error = config_detach(sc->sc_dev, DETACH_QUIET); 369 if (! error) 370 free(cf, M_DEVBUF); 371 mutex_exit(&md_device_lock); 372 return error; 373 } 374 375 static int 376 mdread(dev_t dev, struct uio *uio, int flags) 377 { 378 struct md_softc *sc; 379 380 sc = device_lookup_private(&md_cd, MD_UNIT(dev)); 381 382 if (sc == NULL || sc->sc_type == MD_UNCONFIGURED) 383 return ENXIO; 384 385 return (physio(mdstrategy, NULL, dev, B_READ, minphys, uio)); 386 } 387 388 static int 389 mdwrite(dev_t dev, struct uio *uio, int flags) 390 { 391 struct md_softc *sc; 392 393 sc = device_lookup_private(&md_cd, MD_UNIT(dev)); 394 395 if (sc == NULL || sc->sc_type == MD_UNCONFIGURED) 396 return ENXIO; 397 398 return (physio(mdstrategy, NULL, dev, B_WRITE, minphys, uio)); 399 } 400 401 /* 402 * Handle I/O requests, either directly, or 403 * by passing them to the server process. 404 */ 405 static void 406 mdstrategy(struct buf *bp) 407 { 408 struct md_softc *sc; 409 void * addr; 410 size_t off, xfer; 411 bool is_read; 412 413 sc = device_lookup_private(&md_cd, MD_UNIT(bp->b_dev)); 414 415 mutex_enter(&sc->sc_lock); 416 417 if (sc == NULL || sc->sc_type == MD_UNCONFIGURED) { 418 bp->b_error = ENXIO; 419 goto done; 420 } 421 422 switch (sc->sc_type) { 423 #if MEMORY_DISK_SERVER 424 case MD_UMEM_SERVER: 425 /* Just add this job to the server's queue. */ 426 bufq_put(sc->sc_buflist, bp); 427 cv_signal(&sc->sc_cv); 428 mutex_exit(&sc->sc_lock); 429 /* see md_server_loop() */ 430 /* no biodone in this case */ 431 return; 432 #endif /* MEMORY_DISK_SERVER */ 433 434 case MD_KMEM_FIXED: 435 case MD_KMEM_ALLOCATED: 436 /* These are in kernel space. Access directly. */ 437 is_read = ((bp->b_flags & B_READ) == B_READ); 438 bp->b_resid = bp->b_bcount; 439 off = (bp->b_blkno << DEV_BSHIFT); 440 if (off >= sc->sc_size) { 441 if (is_read) 442 break; /* EOF */ 443 goto set_eio; 444 } 445 xfer = bp->b_resid; 446 if (xfer > (sc->sc_size - off)) 447 xfer = (sc->sc_size - off); 448 addr = (char *)sc->sc_addr + off; 449 disk_busy(&sc->sc_dkdev); 450 if (is_read) 451 memcpy(bp->b_data, addr, xfer); 452 else 453 memcpy(addr, bp->b_data, xfer); 454 disk_unbusy(&sc->sc_dkdev, xfer, is_read); 455 bp->b_resid -= xfer; 456 break; 457 458 default: 459 bp->b_resid = bp->b_bcount; 460 set_eio: 461 bp->b_error = EIO; 462 break; 463 } 464 465 done: 466 mutex_exit(&sc->sc_lock); 467 468 biodone(bp); 469 } 470 471 static int 472 mdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 473 { 474 struct md_softc *sc; 475 struct md_conf *umd; 476 struct disklabel *lp; 477 struct partinfo *pp; 478 int error; 479 480 if ((sc = device_lookup_private(&md_cd, MD_UNIT(dev))) == NULL) 481 return ENXIO; 482 483 mutex_enter(&sc->sc_lock); 484 if (sc->sc_type != MD_UNCONFIGURED) { 485 switch (cmd) { 486 case DIOCGDINFO: 487 lp = (struct disklabel *)data; 488 *lp = *sc->sc_dkdev.dk_label; 489 mutex_exit(&sc->sc_lock); 490 return 0; 491 492 case DIOCGPART: 493 pp = (struct partinfo *)data; 494 pp->disklab = sc->sc_dkdev.dk_label; 495 pp->part = 496 &sc->sc_dkdev.dk_label->d_partitions[DISKPART(dev)]; 497 mutex_exit(&sc->sc_lock); 498 return 0; 499 } 500 } 501 502 /* If this is not the raw partition, punt! */ 503 if (DISKPART(dev) != RAW_PART) { 504 mutex_exit(&sc->sc_lock); 505 return ENOTTY; 506 } 507 508 umd = (struct md_conf *)data; 509 error = EINVAL; 510 switch (cmd) { 511 case MD_GETCONF: 512 *umd = sc->sc_md; 513 error = 0; 514 break; 515 516 case MD_SETCONF: 517 /* Can only set it once. */ 518 if (sc->sc_type != MD_UNCONFIGURED) 519 break; 520 switch (umd->md_type) { 521 case MD_KMEM_ALLOCATED: 522 error = md_ioctl_kalloc(sc, umd, l); 523 break; 524 #if MEMORY_DISK_SERVER 525 case MD_UMEM_SERVER: 526 error = md_ioctl_server(sc, umd, l); 527 break; 528 #endif /* MEMORY_DISK_SERVER */ 529 default: 530 break; 531 } 532 break; 533 } 534 mutex_exit(&sc->sc_lock); 535 return error; 536 } 537 538 static void 539 md_set_disklabel(struct md_softc *sc) 540 { 541 struct disklabel *lp = sc->sc_dkdev.dk_label; 542 struct partition *pp; 543 544 memset(lp, 0, sizeof(*lp)); 545 546 lp->d_secsize = DEV_BSIZE; 547 lp->d_secperunit = sc->sc_size / DEV_BSIZE; 548 if (lp->d_secperunit >= (32*64)) { 549 lp->d_nsectors = 32; 550 lp->d_ntracks = 64; 551 lp->d_ncylinders = lp->d_secperunit / (32*64); 552 } else { 553 lp->d_nsectors = 1; 554 lp->d_ntracks = 1; 555 lp->d_ncylinders = lp->d_secperunit; 556 } 557 lp->d_secpercyl = lp->d_ntracks*lp->d_nsectors; 558 559 strncpy(lp->d_typename, md_cd.cd_name, sizeof(lp->d_typename)); 560 lp->d_type = DTYPE_UNKNOWN; 561 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 562 lp->d_rpm = 3600; 563 lp->d_interleave = 1; 564 lp->d_flags = 0; 565 566 pp = &lp->d_partitions[0]; 567 pp->p_offset = 0; 568 pp->p_size = lp->d_secperunit; 569 pp->p_fstype = FS_BSDFFS; 570 571 pp = &lp->d_partitions[RAW_PART]; 572 pp->p_offset = 0; 573 pp->p_size = lp->d_secperunit; 574 pp->p_fstype = FS_UNUSED; 575 576 lp->d_npartitions = RAW_PART+1; 577 lp->d_magic = DISKMAGIC; 578 lp->d_magic2 = DISKMAGIC; 579 lp->d_checksum = dkcksum(lp); 580 } 581 582 /* 583 * Handle ioctl MD_SETCONF for (sc_type == MD_KMEM_ALLOCATED) 584 * Just allocate some kernel memory and return. 585 */ 586 static int 587 md_ioctl_kalloc(struct md_softc *sc, struct md_conf *umd, 588 struct lwp *l) 589 { 590 vaddr_t addr; 591 vsize_t size; 592 593 mutex_exit(&sc->sc_lock); 594 595 /* Sanity check the size. */ 596 size = umd->md_size; 597 addr = uvm_km_alloc(kernel_map, size, 0, UVM_KMF_WIRED|UVM_KMF_ZERO); 598 599 mutex_enter(&sc->sc_lock); 600 601 if (!addr) 602 return ENOMEM; 603 604 /* If another thread beat us to configure this unit: fail. */ 605 if (sc->sc_type != MD_UNCONFIGURED) { 606 uvm_km_free(kernel_map, addr, size, UVM_KMF_WIRED); 607 return EINVAL; 608 } 609 610 /* This unit is now configured. */ 611 sc->sc_addr = (void *)addr; /* kernel space */ 612 sc->sc_size = (size_t)size; 613 sc->sc_type = MD_KMEM_ALLOCATED; 614 md_set_disklabel(sc); 615 return 0; 616 } 617 618 #if MEMORY_DISK_SERVER 619 620 /* 621 * Handle ioctl MD_SETCONF for (sc_type == MD_UMEM_SERVER) 622 * Set config, then become the I/O server for this unit. 623 */ 624 static int 625 md_ioctl_server(struct md_softc *sc, struct md_conf *umd, 626 struct lwp *l) 627 { 628 vaddr_t end; 629 int error; 630 631 KASSERT(mutex_owned(&sc->sc_lock)); 632 633 /* Sanity check addr, size. */ 634 end = (vaddr_t) ((char *)umd->md_addr + umd->md_size); 635 636 if ((end >= VM_MAXUSER_ADDRESS) || 637 (end < ((vaddr_t) umd->md_addr)) ) 638 return EINVAL; 639 640 /* This unit is now configured. */ 641 sc->sc_addr = umd->md_addr; /* user space */ 642 sc->sc_size = umd->md_size; 643 sc->sc_type = MD_UMEM_SERVER; 644 md_set_disklabel(sc); 645 646 /* Become the server daemon */ 647 error = md_server_loop(sc); 648 649 /* This server is now going away! */ 650 sc->sc_type = MD_UNCONFIGURED; 651 sc->sc_addr = 0; 652 sc->sc_size = 0; 653 654 return (error); 655 } 656 657 static int 658 md_server_loop(struct md_softc *sc) 659 { 660 struct buf *bp; 661 void *addr; /* user space address */ 662 size_t off; /* offset into "device" */ 663 size_t xfer; /* amount to transfer */ 664 int error; 665 bool is_read; 666 667 KASSERT(mutex_owned(&sc->sc_lock)); 668 669 for (;;) { 670 /* Wait for some work to arrive. */ 671 while ((bp = bufq_get(sc->sc_buflist)) == NULL) { 672 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 673 if (error) 674 return error; 675 } 676 677 /* Do the transfer to/from user space. */ 678 mutex_exit(&sc->sc_lock); 679 error = 0; 680 is_read = ((bp->b_flags & B_READ) == B_READ); 681 bp->b_resid = bp->b_bcount; 682 off = (bp->b_blkno << DEV_BSHIFT); 683 if (off >= sc->sc_size) { 684 if (is_read) 685 goto done; /* EOF (not an error) */ 686 error = EIO; 687 goto done; 688 } 689 xfer = bp->b_resid; 690 if (xfer > (sc->sc_size - off)) 691 xfer = (sc->sc_size - off); 692 addr = (char *)sc->sc_addr + off; 693 disk_busy(&sc->sc_dkdev); 694 if (is_read) 695 error = copyin(addr, bp->b_data, xfer); 696 else 697 error = copyout(bp->b_data, addr, xfer); 698 disk_unbusy(&sc->sc_dkdev, (error ? 0 : xfer), is_read); 699 if (!error) 700 bp->b_resid -= xfer; 701 702 done: 703 if (error) { 704 bp->b_error = error; 705 } 706 biodone(bp); 707 mutex_enter(&sc->sc_lock); 708 } 709 } 710 #endif /* MEMORY_DISK_SERVER */ 711
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