core.c revision 72dcc883d8e5b59105e75ee5265442e458740575
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 "../base.h" 73#include "pnpbios.h" 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 */ 104static int pnp_dock_event(int dock, struct pnp_docking_station_info *info) 105{ 106 char *argv[3], **envp, *buf, *scratch; 107 int i = 0, value; 108 109 if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL))) 110 return -ENOMEM; 111 if (!(buf = kzalloc(256, GFP_KERNEL))) { 112 kfree(envp); 113 return -ENOMEM; 114 } 115 116 /* FIXME: if there are actual users of this, it should be 117 * integrated into the driver core and use the usual infrastructure 118 * like sysfs and uevents 119 */ 120 argv[0] = "/sbin/pnpbios"; 121 argv[1] = "dock"; 122 argv[2] = NULL; 123 124 /* minimal command environment */ 125 envp[i++] = "HOME=/"; 126 envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; 127 128#ifdef DEBUG 129 /* hint that policy agent should enter no-stdout debug mode */ 130 envp[i++] = "DEBUG=kernel"; 131#endif 132 /* extensible set of named bus-specific parameters, 133 * supporting multiple driver selection algorithms. 134 */ 135 scratch = buf; 136 137 /* action: add, remove */ 138 envp[i++] = scratch; 139 scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1; 140 141 /* Report the ident for the dock */ 142 envp[i++] = scratch; 143 scratch += sprintf(scratch, "DOCK=%x/%x/%x", 144 info->location_id, info->serial, info->capabilities); 145 envp[i] = NULL; 146 147 value = call_usermodehelper(argv [0], argv, envp, UMH_WAIT_EXEC); 148 kfree(buf); 149 kfree(envp); 150 return 0; 151} 152 153/* 154 * Poll the PnP docking at regular intervals 155 */ 156static int pnp_dock_thread(void *unused) 157{ 158 static struct pnp_docking_station_info now; 159 int docked = -1, d = 0; 160 161 set_freezable(); 162 while (!unloading) { 163 int status; 164 165 /* 166 * Poll every 2 seconds 167 */ 168 msleep_interruptible(2000); 169 170 if (try_to_freeze()) 171 continue; 172 173 status = pnp_bios_dock_station_info(&now); 174 175 switch (status) { 176 /* 177 * No dock to manage 178 */ 179 case PNP_FUNCTION_NOT_SUPPORTED: 180 complete_and_exit(&unload_sem, 0); 181 case PNP_SYSTEM_NOT_DOCKED: 182 d = 0; 183 break; 184 case PNP_SUCCESS: 185 d = 1; 186 break; 187 default: 188 pnpbios_print_status("pnp_dock_thread", status); 189 continue; 190 } 191 if (d != docked) { 192 if (pnp_dock_event(d, &now) == 0) { 193 docked = d; 194#if 0 195 printk(KERN_INFO 196 "PnPBIOS: Docking station %stached\n", 197 docked ? "at" : "de"); 198#endif 199 } 200 } 201 } 202 complete_and_exit(&unload_sem, 0); 203} 204 205#endif /* CONFIG_HOTPLUG */ 206 207static int pnpbios_get_resources(struct pnp_dev *dev) 208{ 209 u8 nodenum = dev->number; 210 struct pnp_bios_node *node; 211 212 if (!pnpbios_is_dynamic(dev)) 213 return -EPERM; 214 215 dev_dbg(&dev->dev, "get resources\n"); 216 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 217 if (!node) 218 return -1; 219 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 220 kfree(node); 221 return -ENODEV; 222 } 223 pnpbios_read_resources_from_node(dev, node); 224 dev->active = pnp_is_active(dev); 225 kfree(node); 226 return 0; 227} 228 229static int pnpbios_set_resources(struct pnp_dev *dev) 230{ 231 u8 nodenum = dev->number; 232 struct pnp_bios_node *node; 233 int ret; 234 235 if (!pnpbios_is_dynamic(dev)) 236 return -EPERM; 237 238 dev_dbg(&dev->dev, "set resources\n"); 239 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 240 if (!node) 241 return -1; 242 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 243 kfree(node); 244 return -ENODEV; 245 } 246 if (pnpbios_write_resources_to_node(dev, node) < 0) { 247 kfree(node); 248 return -1; 249 } 250 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); 251 kfree(node); 252 if (ret > 0) 253 ret = -1; 254 return ret; 255} 256 257static void pnpbios_zero_data_stream(struct pnp_bios_node *node) 258{ 259 unsigned char *p = (char *)node->data; 260 unsigned char *end = (char *)(node->data + node->size); 261 unsigned int len; 262 int i; 263 264 while ((char *)p < (char *)end) { 265 if (p[0] & 0x80) { /* large tag */ 266 len = (p[2] << 8) | p[1]; 267 p += 3; 268 } else { 269 if (((p[0] >> 3) & 0x0f) == 0x0f) 270 return; 271 len = p[0] & 0x07; 272 p += 1; 273 } 274 for (i = 0; i < len; i++) 275 p[i] = 0; 276 p += len; 277 } 278 printk(KERN_ERR 279 "PnPBIOS: Resource structure did not contain an end tag.\n"); 280} 281 282static int pnpbios_disable_resources(struct pnp_dev *dev) 283{ 284 struct pnp_bios_node *node; 285 u8 nodenum = dev->number; 286 int ret; 287 288 if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) 289 return -EPERM; 290 291 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 292 if (!node) 293 return -ENOMEM; 294 295 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 296 kfree(node); 297 return -ENODEV; 298 } 299 pnpbios_zero_data_stream(node); 300 301 ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node); 302 kfree(node); 303 if (ret > 0) 304 ret = -1; 305 return ret; 306} 307 308/* PnP Layer support */ 309 310struct pnp_protocol pnpbios_protocol = { 311 .name = "Plug and Play BIOS", 312 .get = pnpbios_get_resources, 313 .set = pnpbios_set_resources, 314 .disable = pnpbios_disable_resources, 315}; 316 317static int __init insert_device(struct pnp_bios_node *node) 318{ 319 struct list_head *pos; 320 struct pnp_dev *dev; 321 char id[8]; 322 323 /* check if the device is already added */ 324 list_for_each(pos, &pnpbios_protocol.devices) { 325 dev = list_entry(pos, struct pnp_dev, protocol_list); 326 if (dev->number == node->handle) 327 return -1; 328 } 329 330 pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id); 331 dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id); 332 if (!dev) 333 return -1; 334 335 pnpbios_parse_data_stream(dev, node); 336 dev->active = pnp_is_active(dev); 337 dev->flags = node->flags; 338 if (!(dev->flags & PNPBIOS_NO_CONFIG)) 339 dev->capabilities |= PNP_CONFIGURABLE; 340 if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev)) 341 dev->capabilities |= PNP_DISABLE; 342 dev->capabilities |= PNP_READ; 343 if (pnpbios_is_dynamic(dev)) 344 dev->capabilities |= PNP_WRITE; 345 if (dev->flags & PNPBIOS_REMOVABLE) 346 dev->capabilities |= PNP_REMOVABLE; 347 348 /* clear out the damaged flags */ 349 if (!dev->active) 350 pnp_init_resource_table(&dev->res); 351 352 pnp_add_device(dev); 353 pnpbios_interface_attach_device(node); 354 355 return 0; 356} 357 358static void __init build_devlist(void) 359{ 360 u8 nodenum; 361 unsigned int nodes_got = 0; 362 unsigned int devs = 0; 363 struct pnp_bios_node *node; 364 365 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 366 if (!node) 367 return; 368 369 for (nodenum = 0; nodenum < 0xff;) { 370 u8 thisnodenum = nodenum; 371 /* eventually we will want to use PNPMODE_STATIC here but for now 372 * dynamic will help us catch buggy bioses to add to the blacklist. 373 */ 374 if (!pnpbios_dont_use_current_config) { 375 if (pnp_bios_get_dev_node 376 (&nodenum, (char)PNPMODE_DYNAMIC, node)) 377 break; 378 } else { 379 if (pnp_bios_get_dev_node 380 (&nodenum, (char)PNPMODE_STATIC, node)) 381 break; 382 } 383 nodes_got++; 384 if (insert_device(node) == 0) 385 devs++; 386 if (nodenum <= thisnodenum) { 387 printk(KERN_ERR 388 "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", 389 (unsigned int)nodenum, 390 (unsigned int)thisnodenum); 391 break; 392 } 393 } 394 kfree(node); 395 396 printk(KERN_INFO 397 "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n", 398 nodes_got, nodes_got != 1 ? "s" : "", devs); 399} 400 401/* 402 * 403 * INIT AND EXIT 404 * 405 */ 406 407static int pnpbios_disabled; 408int pnpbios_dont_use_current_config; 409 410static int __init pnpbios_setup(char *str) 411{ 412 int invert; 413 414 while ((str != NULL) && (*str != '\0')) { 415 if (strncmp(str, "off", 3) == 0) 416 pnpbios_disabled = 1; 417 if (strncmp(str, "on", 2) == 0) 418 pnpbios_disabled = 0; 419 invert = (strncmp(str, "no-", 3) == 0); 420 if (invert) 421 str += 3; 422 if (strncmp(str, "curr", 4) == 0) 423 pnpbios_dont_use_current_config = invert; 424 str = strchr(str, ','); 425 if (str != NULL) 426 str += strspn(str, ", \t"); 427 } 428 429 return 1; 430} 431 432__setup("pnpbios=", pnpbios_setup); 433 434/* PnP BIOS signature: "$PnP" */ 435#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24)) 436 437static int __init pnpbios_probe_system(void) 438{ 439 union pnp_bios_install_struct *check; 440 u8 sum; 441 int length, i; 442 443 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n"); 444 445 /* 446 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS 447 * structure and, if one is found, sets up the selectors and 448 * entry points 449 */ 450 for (check = (union pnp_bios_install_struct *)__va(0xf0000); 451 check < (union pnp_bios_install_struct *)__va(0xffff0); 452 check = (void *)check + 16) { 453 if (check->fields.signature != PNP_SIGNATURE) 454 continue; 455 printk(KERN_INFO 456 "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", 457 check); 458 length = check->fields.length; 459 if (!length) { 460 printk(KERN_ERR 461 "PnPBIOS: installation structure is invalid, skipping\n"); 462 continue; 463 } 464 for (sum = 0, i = 0; i < length; i++) 465 sum += check->chars[i]; 466 if (sum) { 467 printk(KERN_ERR 468 "PnPBIOS: installation structure is corrupted, skipping\n"); 469 continue; 470 } 471 if (check->fields.version < 0x10) { 472 printk(KERN_WARNING 473 "PnPBIOS: PnP BIOS version %d.%d is not supported\n", 474 check->fields.version >> 4, 475 check->fields.version & 15); 476 continue; 477 } 478 printk(KERN_INFO 479 "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n", 480 check->fields.version >> 4, check->fields.version & 15, 481 check->fields.pm16cseg, check->fields.pm16offset, 482 check->fields.pm16dseg); 483 pnp_bios_install = check; 484 return 1; 485 } 486 487 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n"); 488 return 0; 489} 490 491static int __init exploding_pnp_bios(const struct dmi_system_id *d) 492{ 493 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident); 494 return 0; 495} 496 497static struct dmi_system_id pnpbios_dmi_table[] __initdata = { 498 { /* PnPBIOS GPF on boot */ 499 .callback = exploding_pnp_bios, 500 .ident = "Higraded P14H", 501 .matches = { 502 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 503 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"), 504 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"), 505 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"), 506 }, 507 }, 508 { /* PnPBIOS GPF on boot */ 509 .callback = exploding_pnp_bios, 510 .ident = "ASUS P4P800", 511 .matches = { 512 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."), 513 DMI_MATCH(DMI_BOARD_NAME, "P4P800"), 514 }, 515 }, 516 {} 517}; 518 519static int __init pnpbios_init(void) 520{ 521 int ret; 522 523#if defined(CONFIG_PPC_MERGE) 524 if (check_legacy_ioport(PNPBIOS_BASE)) 525 return -ENODEV; 526#endif 527 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) || 528 paravirt_enabled()) { 529 printk(KERN_INFO "PnPBIOS: Disabled\n"); 530 return -ENODEV; 531 } 532#ifdef CONFIG_PNPACPI 533 if (!acpi_disabled && !pnpacpi_disabled) { 534 pnpbios_disabled = 1; 535 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n"); 536 return -ENODEV; 537 } 538#endif /* CONFIG_ACPI */ 539 540 /* scan the system for pnpbios support */ 541 if (!pnpbios_probe_system()) 542 return -ENODEV; 543 544 /* make preparations for bios calls */ 545 pnpbios_calls_init(pnp_bios_install); 546 547 /* read the node info */ 548 ret = pnp_bios_dev_node_info(&node_info); 549 if (ret) { 550 printk(KERN_ERR 551 "PnPBIOS: Unable to get node info. Aborting.\n"); 552 return ret; 553 } 554 555 /* register with the pnp layer */ 556 ret = pnp_register_protocol(&pnpbios_protocol); 557 if (ret) { 558 printk(KERN_ERR 559 "PnPBIOS: Unable to register driver. Aborting.\n"); 560 return ret; 561 } 562 563 /* start the proc interface */ 564 ret = pnpbios_proc_init(); 565 if (ret) 566 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n"); 567 568 /* scan for pnpbios devices */ 569 build_devlist(); 570 571 pnp_platform_devices = 1; 572 return 0; 573} 574 575subsys_initcall(pnpbios_init); 576 577static int __init pnpbios_thread_init(void) 578{ 579 struct task_struct *task; 580 581#if defined(CONFIG_PPC_MERGE) 582 if (check_legacy_ioport(PNPBIOS_BASE)) 583 return 0; 584#endif 585 if (pnpbios_disabled) 586 return 0; 587#ifdef CONFIG_HOTPLUG 588 init_completion(&unload_sem); 589 task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd"); 590 if (!IS_ERR(task)) 591 unloading = 0; 592#endif 593 return 0; 594} 595 596/* Start the kernel thread later: */ 597module_init(pnpbios_thread_init); 598 599EXPORT_SYMBOL(pnpbios_protocol); 600