core.c revision 8f81dd149806bc53c68c92f34d61f88427079039
1/* 2 * pnpbios -- PnP BIOS driver 3 * 4 * This driver provides access to Plug-'n'-Play services provided by 5 * the PnP BIOS firmware, described in the following documents: 6 * Plug and Play BIOS Specification, Version 1.0A, 5 May 1994 7 * Plug and Play BIOS Clarification Paper, 6 October 1994 8 * Compaq Computer Corporation, Phoenix Technologies Ltd., Intel Corp. 9 * 10 * Originally (C) 1998 Christian Schmidt <schmidt@digadd.de> 11 * Modifications (C) 1998 Tom Lees <tom@lpsg.demon.co.uk> 12 * Minor reorganizations by David Hinds <dahinds@users.sourceforge.net> 13 * Further modifications (C) 2001, 2002 by: 14 * Alan Cox <alan@redhat.com> 15 * Thomas Hood 16 * Brian Gerst <bgerst@didntduck.org> 17 * 18 * Ported to the PnP Layer and several additional improvements (C) 2002 19 * by Adam Belay <ambx1@neo.rr.com> 20 * 21 * This program is free software; you can redistribute it and/or modify it 22 * under the terms of the GNU General Public License as published by the 23 * Free Software Foundation; either version 2, or (at your option) any 24 * later version. 25 * 26 * This program is distributed in the hope that it will be useful, but 27 * WITHOUT ANY WARRANTY; without even the implied warranty of 28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 29 * General Public License for more details. 30 * 31 * You should have received a copy of the GNU General Public License 32 * along with this program; if not, write to the Free Software 33 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 34 */ 35 36/* Change Log 37 * 38 * Adam Belay - <ambx1@neo.rr.com> - March 16, 2003 39 * rev 1.01 Only call pnp_bios_dev_node_info once 40 * Added pnpbios_print_status 41 * Added several new error messages and info messages 42 * Added pnpbios_interface_attach_device 43 * integrated core and proc init system 44 * Introduced PNPMODE flags 45 * Removed some useless includes 46 */ 47 48#include <linux/types.h> 49#include <linux/module.h> 50#include <linux/init.h> 51#include <linux/linkage.h> 52#include <linux/kernel.h> 53#include <linux/pnpbios.h> 54#include <linux/device.h> 55#include <linux/pnp.h> 56#include <linux/mm.h> 57#include <linux/smp.h> 58#include <linux/slab.h> 59#include <linux/completion.h> 60#include <linux/spinlock.h> 61#include <linux/dmi.h> 62#include <linux/delay.h> 63#include <linux/acpi.h> 64#include <linux/freezer.h> 65#include <linux/kthread.h> 66 67#include <asm/page.h> 68#include <asm/desc.h> 69#include <asm/system.h> 70#include <asm/byteorder.h> 71 72#include "pnpbios.h" 73 74 75/* 76 * 77 * PnP BIOS INTERFACE 78 * 79 */ 80 81static union pnp_bios_install_struct * pnp_bios_install = NULL; 82 83int pnp_bios_present(void) 84{ 85 return (pnp_bios_install != NULL); 86} 87 88struct pnp_dev_node_info node_info; 89 90/* 91 * 92 * DOCKING FUNCTIONS 93 * 94 */ 95 96#ifdef CONFIG_HOTPLUG 97 98static int unloading = 0; 99static struct completion unload_sem; 100 101/* 102 * (Much of this belongs in a shared routine somewhere) 103 */ 104 105static int pnp_dock_event(int dock, struct pnp_docking_station_info *info) 106{ 107 char *argv [3], **envp, *buf, *scratch; 108 int i = 0, value; 109 110 if (!current->fs->root) { 111 return -EAGAIN; 112 } 113 if (!(envp = kcalloc(20, sizeof (char *), GFP_KERNEL))) { 114 return -ENOMEM; 115 } 116 if (!(buf = kzalloc(256, GFP_KERNEL))) { 117 kfree (envp); 118 return -ENOMEM; 119 } 120 121 /* FIXME: if there are actual users of this, it should be integrated into 122 * the driver core and use the usual infrastructure like sysfs and uevents */ 123 argv [0] = "/sbin/pnpbios"; 124 argv [1] = "dock"; 125 argv [2] = NULL; 126 127 /* minimal command environment */ 128 envp [i++] = "HOME=/"; 129 envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; 130 131#ifdef DEBUG 132 /* hint that policy agent should enter no-stdout debug mode */ 133 envp [i++] = "DEBUG=kernel"; 134#endif 135 /* extensible set of named bus-specific parameters, 136 * supporting multiple driver selection algorithms. 137 */ 138 scratch = buf; 139 140 /* action: add, remove */ 141 envp [i++] = scratch; 142 scratch += sprintf (scratch, "ACTION=%s", dock?"add":"remove") + 1; 143 144 /* Report the ident for the dock */ 145 envp [i++] = scratch; 146 scratch += sprintf (scratch, "DOCK=%x/%x/%x", 147 info->location_id, info->serial, info->capabilities); 148 envp[i] = NULL; 149 150 value = call_usermodehelper (argv [0], argv, envp, 0); 151 kfree (buf); 152 kfree (envp); 153 return 0; 154} 155 156/* 157 * Poll the PnP docking at regular intervals 158 */ 159static int pnp_dock_thread(void * unused) 160{ 161 static struct pnp_docking_station_info now; 162 int docked = -1, d = 0; 163 while (!unloading) 164 { 165 int status; 166 167 /* 168 * Poll every 2 seconds 169 */ 170 msleep_interruptible(2000); 171 172 if (try_to_freeze()) 173 continue; 174 175 status = pnp_bios_dock_station_info(&now); 176 177 switch(status) 178 { 179 /* 180 * No dock to manage 181 */ 182 case PNP_FUNCTION_NOT_SUPPORTED: 183 complete_and_exit(&unload_sem, 0); 184 case PNP_SYSTEM_NOT_DOCKED: 185 d = 0; 186 break; 187 case PNP_SUCCESS: 188 d = 1; 189 break; 190 default: 191 pnpbios_print_status( "pnp_dock_thread", status ); 192 continue; 193 } 194 if(d != docked) 195 { 196 if(pnp_dock_event(d, &now)==0) 197 { 198 docked = d; 199#if 0 200 printk(KERN_INFO "PnPBIOS: Docking station %stached\n", docked?"at":"de"); 201#endif 202 } 203 } 204 } 205 complete_and_exit(&unload_sem, 0); 206} 207 208#endif /* CONFIG_HOTPLUG */ 209 210static int pnpbios_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res) 211{ 212 u8 nodenum = dev->number; 213 struct pnp_bios_node * node; 214 215 /* just in case */ 216 if(!pnpbios_is_dynamic(dev)) 217 return -EPERM; 218 219 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 220 if (!node) 221 return -1; 222 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { 223 kfree(node); 224 return -ENODEV; 225 } 226 pnpbios_read_resources_from_node(res, node); 227 dev->active = pnp_is_active(dev); 228 kfree(node); 229 return 0; 230} 231 232static int pnpbios_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res) 233{ 234 u8 nodenum = dev->number; 235 struct pnp_bios_node * node; 236 int ret; 237 238 /* just in case */ 239 if (!pnpbios_is_dynamic(dev)) 240 return -EPERM; 241 242 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 243 if (!node) 244 return -1; 245 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { 246 kfree(node); 247 return -ENODEV; 248 } 249 if(pnpbios_write_resources_to_node(res, node)<0) { 250 kfree(node); 251 return -1; 252 } 253 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); 254 kfree(node); 255 if (ret > 0) 256 ret = -1; 257 return ret; 258} 259 260static void pnpbios_zero_data_stream(struct pnp_bios_node * node) 261{ 262 unsigned char * p = (char *)node->data; 263 unsigned char * end = (char *)(node->data + node->size); 264 unsigned int len; 265 int i; 266 while ((char *)p < (char *)end) { 267 if(p[0] & 0x80) { /* large tag */ 268 len = (p[2] << 8) | p[1]; 269 p += 3; 270 } else { 271 if (((p[0]>>3) & 0x0f) == 0x0f) 272 return; 273 len = p[0] & 0x07; 274 p += 1; 275 } 276 for (i = 0; i < len; i++) 277 p[i] = 0; 278 p += len; 279 } 280 printk(KERN_ERR "PnPBIOS: Resource structure did not contain an end tag.\n"); 281} 282 283static int pnpbios_disable_resources(struct pnp_dev *dev) 284{ 285 struct pnp_bios_node * node; 286 u8 nodenum = dev->number; 287 int ret; 288 289 /* just in case */ 290 if(dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) 291 return -EPERM; 292 293 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 294 if (!node) 295 return -ENOMEM; 296 297 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { 298 kfree(node); 299 return -ENODEV; 300 } 301 pnpbios_zero_data_stream(node); 302 303 ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node); 304 kfree(node); 305 if (ret > 0) 306 ret = -1; 307 return ret; 308} 309 310/* PnP Layer support */ 311 312struct pnp_protocol pnpbios_protocol = { 313 .name = "Plug and Play BIOS", 314 .get = pnpbios_get_resources, 315 .set = pnpbios_set_resources, 316 .disable = pnpbios_disable_resources, 317}; 318 319static int insert_device(struct pnp_dev *dev, struct pnp_bios_node * node) 320{ 321 struct list_head * pos; 322 struct pnp_dev * pnp_dev; 323 struct pnp_id *dev_id; 324 char id[8]; 325 326 /* check if the device is already added */ 327 dev->number = node->handle; 328 list_for_each (pos, &pnpbios_protocol.devices){ 329 pnp_dev = list_entry(pos, struct pnp_dev, protocol_list); 330 if (dev->number == pnp_dev->number) 331 return -1; 332 } 333 334 /* set the initial values for the PnP device */ 335 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL); 336 if (!dev_id) 337 return -1; 338 pnpid32_to_pnpid(node->eisa_id,id); 339 memcpy(dev_id->id,id,7); 340 pnp_add_id(dev_id, dev); 341 pnpbios_parse_data_stream(dev, node); 342 dev->active = pnp_is_active(dev); 343 dev->flags = node->flags; 344 if (!(dev->flags & PNPBIOS_NO_CONFIG)) 345 dev->capabilities |= PNP_CONFIGURABLE; 346 if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev)) 347 dev->capabilities |= PNP_DISABLE; 348 dev->capabilities |= PNP_READ; 349 if (pnpbios_is_dynamic(dev)) 350 dev->capabilities |= PNP_WRITE; 351 if (dev->flags & PNPBIOS_REMOVABLE) 352 dev->capabilities |= PNP_REMOVABLE; 353 dev->protocol = &pnpbios_protocol; 354 355 /* clear out the damaged flags */ 356 if (!dev->active) 357 pnp_init_resource_table(&dev->res); 358 359 pnp_add_device(dev); 360 pnpbios_interface_attach_device(node); 361 362 return 0; 363} 364 365static void __init build_devlist(void) 366{ 367 u8 nodenum; 368 unsigned int nodes_got = 0; 369 unsigned int devs = 0; 370 struct pnp_bios_node *node; 371 struct pnp_dev *dev; 372 373 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 374 if (!node) 375 return; 376 377 for(nodenum=0; nodenum<0xff; ) { 378 u8 thisnodenum = nodenum; 379 /* eventually we will want to use PNPMODE_STATIC here but for now 380 * dynamic will help us catch buggy bioses to add to the blacklist. 381 */ 382 if (!pnpbios_dont_use_current_config) { 383 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) 384 break; 385 } else { 386 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_STATIC, node)) 387 break; 388 } 389 nodes_got++; 390 dev = kzalloc(sizeof (struct pnp_dev), GFP_KERNEL); 391 if (!dev) 392 break; 393 if(insert_device(dev,node)<0) 394 kfree(dev); 395 else 396 devs++; 397 if (nodenum <= thisnodenum) { 398 printk(KERN_ERR "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", (unsigned int)nodenum, (unsigned int)thisnodenum); 399 break; 400 } 401 } 402 kfree(node); 403 404 printk(KERN_INFO "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n", 405 nodes_got, nodes_got != 1 ? "s" : "", devs); 406} 407 408/* 409 * 410 * INIT AND EXIT 411 * 412 */ 413 414static int pnpbios_disabled; /* = 0 */ 415int pnpbios_dont_use_current_config; /* = 0 */ 416 417#ifndef MODULE 418static int __init pnpbios_setup(char *str) 419{ 420 int invert; 421 422 while ((str != NULL) && (*str != '\0')) { 423 if (strncmp(str, "off", 3) == 0) 424 pnpbios_disabled=1; 425 if (strncmp(str, "on", 2) == 0) 426 pnpbios_disabled=0; 427 invert = (strncmp(str, "no-", 3) == 0); 428 if (invert) 429 str += 3; 430 if (strncmp(str, "curr", 4) == 0) 431 pnpbios_dont_use_current_config = invert; 432 str = strchr(str, ','); 433 if (str != NULL) 434 str += strspn(str, ", \t"); 435 } 436 437 return 1; 438} 439 440__setup("pnpbios=", pnpbios_setup); 441#endif 442 443/* PnP BIOS signature: "$PnP" */ 444#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24)) 445 446static int __init pnpbios_probe_system(void) 447{ 448 union pnp_bios_install_struct *check; 449 u8 sum; 450 int length, i; 451 452 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n"); 453 454 /* 455 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS 456 * structure and, if one is found, sets up the selectors and 457 * entry points 458 */ 459 for (check = (union pnp_bios_install_struct *) __va(0xf0000); 460 check < (union pnp_bios_install_struct *) __va(0xffff0); 461 check = (void *)check + 16) { 462 if (check->fields.signature != PNP_SIGNATURE) 463 continue; 464 printk(KERN_INFO "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check); 465 length = check->fields.length; 466 if (!length) { 467 printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n"); 468 continue; 469 } 470 for (sum = 0, i = 0; i < length; i++) 471 sum += check->chars[i]; 472 if (sum) { 473 printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n"); 474 continue; 475 } 476 if (check->fields.version < 0x10) { 477 printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n", 478 check->fields.version >> 4, 479 check->fields.version & 15); 480 continue; 481 } 482 printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n", 483 check->fields.version >> 4, check->fields.version & 15, 484 check->fields.pm16cseg, check->fields.pm16offset, 485 check->fields.pm16dseg); 486 pnp_bios_install = check; 487 return 1; 488 } 489 490 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n"); 491 return 0; 492} 493 494static int __init exploding_pnp_bios(struct dmi_system_id *d) 495{ 496 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident); 497 return 0; 498} 499 500static struct dmi_system_id pnpbios_dmi_table[] __initdata = { 501 { /* PnPBIOS GPF on boot */ 502 .callback = exploding_pnp_bios, 503 .ident = "Higraded P14H", 504 .matches = { 505 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 506 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"), 507 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"), 508 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"), 509 }, 510 }, 511 { /* PnPBIOS GPF on boot */ 512 .callback = exploding_pnp_bios, 513 .ident = "ASUS P4P800", 514 .matches = { 515 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."), 516 DMI_MATCH(DMI_BOARD_NAME, "P4P800"), 517 }, 518 }, 519 { } 520}; 521 522static int __init pnpbios_init(void) 523{ 524 int ret; 525 526#if defined(CONFIG_PPC_MERGE) 527 if (check_legacy_ioport(PNPBIOS_BASE)) 528 return -ENODEV; 529#endif 530 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) || 531 paravirt_enabled()) { 532 printk(KERN_INFO "PnPBIOS: Disabled\n"); 533 return -ENODEV; 534 } 535 536#ifdef CONFIG_PNPACPI 537 if (!acpi_disabled && !pnpacpi_disabled) { 538 pnpbios_disabled = 1; 539 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n"); 540 return -ENODEV; 541 } 542#endif /* CONFIG_ACPI */ 543 544 /* scan the system for pnpbios support */ 545 if (!pnpbios_probe_system()) 546 return -ENODEV; 547 548 /* make preparations for bios calls */ 549 pnpbios_calls_init(pnp_bios_install); 550 551 /* read the node info */ 552 ret = pnp_bios_dev_node_info(&node_info); 553 if (ret) { 554 printk(KERN_ERR "PnPBIOS: Unable to get node info. Aborting.\n"); 555 return ret; 556 } 557 558 /* register with the pnp layer */ 559 ret = pnp_register_protocol(&pnpbios_protocol); 560 if (ret) { 561 printk(KERN_ERR "PnPBIOS: Unable to register driver. Aborting.\n"); 562 return ret; 563 } 564 565 /* start the proc interface */ 566 ret = pnpbios_proc_init(); 567 if (ret) 568 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n"); 569 570 /* scan for pnpbios devices */ 571 build_devlist(); 572 573 pnp_platform_devices = 1; 574 return 0; 575} 576 577subsys_initcall(pnpbios_init); 578 579static int __init pnpbios_thread_init(void) 580{ 581 struct task_struct *task; 582#if defined(CONFIG_PPC_MERGE) 583 if (check_legacy_ioport(PNPBIOS_BASE)) 584 return 0; 585#endif 586 if (pnpbios_disabled) 587 return 0; 588#ifdef CONFIG_HOTPLUG 589 init_completion(&unload_sem); 590 task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd"); 591 if (!IS_ERR(task)) 592 unloading = 0; 593#endif 594 return 0; 595} 596 597#ifndef MODULE 598 599/* init/main.c calls pnpbios_init early */ 600 601/* Start the kernel thread later: */ 602module_init(pnpbios_thread_init); 603 604#else 605 606/* 607 * N.B.: Building pnpbios as a module hasn't been fully implemented 608 */ 609 610MODULE_LICENSE("GPL"); 611 612static int __init pnpbios_init_all(void) 613{ 614 int r; 615 616 r = pnpbios_init(); 617 if (r) 618 return r; 619 r = pnpbios_thread_init(); 620 if (r) 621 return r; 622 return 0; 623} 624 625static void __exit pnpbios_exit(void) 626{ 627#ifdef CONFIG_HOTPLUG 628 unloading = 1; 629 wait_for_completion(&unload_sem); 630#endif 631 pnpbios_proc_exit(); 632 /* We ought to free resources here */ 633 return; 634} 635 636module_init(pnpbios_init_all); 637module_exit(pnpbios_exit); 638 639#endif 640 641EXPORT_SYMBOL(pnpbios_protocol); 642