1 /* 2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $) 3 * 4 * Copyright (C) 2000 Andrew Henroid 5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 7 * 8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 * 24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 25 * 26 */ 27 28 #include <linux/module.h> 29 #include <linux/kernel.h> 30 #include <linux/slab.h> 31 #include <linux/mm.h> 32 #include <linux/pci.h> 33 #include <linux/interrupt.h> 34 #include <linux/kmod.h> 35 #include <linux/delay.h> 36 #include <linux/dmi.h> 37 #include <linux/workqueue.h> 38 #include <linux/nmi.h> 39 #include <linux/acpi.h> 40 #include <acpi/acpi.h> 41 #include <asm/io.h> 42 #include <acpi/acpi_bus.h> 43 #include <acpi/processor.h> 44 #include <asm/uaccess.h> 45 46 #include <linux/efi.h> 47 #include <linux/ioport.h> 48 #include <linux/list.h> 49 50 #define _COMPONENT ACPI_OS_SERVICES 51 ACPI_MODULE_NAME("osl"); 52 #define PREFIX "ACPI: " 53 struct acpi_os_dpc { 54 acpi_osd_exec_callback function; 55 void *context; 56 struct work_struct work; 57 }; 58 59 #ifdef CONFIG_ACPI_CUSTOM_DSDT 60 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 61 #endif 62 63 #ifdef ENABLE_DEBUGGER 64 #include <linux/kdb.h> 65 66 /* stuff for debugger support */ 67 int acpi_in_debugger; 68 EXPORT_SYMBOL(acpi_in_debugger); 69 70 extern char line_buf[80]; 71 #endif /*ENABLE_DEBUGGER */ 72 73 static unsigned int acpi_irq_irq; 74 static acpi_osd_handler acpi_irq_handler; 75 static void *acpi_irq_context; 76 static struct workqueue_struct *kacpid_wq; 77 static struct workqueue_struct *kacpi_notify_wq; 78 79 struct acpi_res_list { 80 resource_size_t start; 81 resource_size_t end; 82 acpi_adr_space_type resource_type; /* IO port, System memory, ...*/ 83 char name[5]; /* only can have a length of 4 chars, make use of this 84 one instead of res->name, no need to kalloc then */ 85 struct list_head resource_list; 86 }; 87 88 static LIST_HEAD(resource_list_head); 89 static DEFINE_SPINLOCK(acpi_res_lock); 90 91 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 92 static char osi_additional_string[OSI_STRING_LENGTH_MAX]; 93 94 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD 95 static int acpi_no_initrd_override; 96 #endif 97 98 /* 99 * "Ode to _OSI(Linux)" 100 * 101 * osi_linux -- Control response to BIOS _OSI(Linux) query. 102 * 103 * As Linux evolves, the features that it supports change. 104 * So an OSI string such as "Linux" is not specific enough 105 * to be useful across multiple versions of Linux. It 106 * doesn't identify any particular feature, interface, 107 * or even any particular version of Linux... 108 * 109 * Unfortunately, Linux-2.6.22 and earlier responded "yes" 110 * to a BIOS _OSI(Linux) query. When 111 * a reference mobile BIOS started using it, its use 112 * started to spread to many vendor platforms. 113 * As it is not supportable, we need to halt that spread. 114 * 115 * Today, most BIOS references to _OSI(Linux) are noise -- 116 * they have no functional effect and are just dead code 117 * carried over from the reference BIOS. 118 * 119 * The next most common case is that _OSI(Linux) harms Linux, 120 * usually by causing the BIOS to follow paths that are 121 * not tested during Windows validation. 122 * 123 * Finally, there is a short list of platforms 124 * where OSI(Linux) benefits Linux. 125 * 126 * In Linux-2.6.23, OSI(Linux) is first disabled by default. 127 * DMI is used to disable the dmesg warning about OSI(Linux) 128 * on platforms where it is known to have no effect. 129 * But a dmesg warning remains for systems where 130 * we do not know if OSI(Linux) is good or bad for the system. 131 * DMI is also used to enable OSI(Linux) for the machines 132 * that are known to need it. 133 * 134 * BIOS writers should NOT query _OSI(Linux) on future systems. 135 * It will be ignored by default, and to get Linux to 136 * not ignore it will require a kernel source update to 137 * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation. 138 */ 139 #define OSI_LINUX_ENABLE 0 140 141 static struct osi_linux { 142 unsigned int enable:1; 143 unsigned int dmi:1; 144 unsigned int cmdline:1; 145 unsigned int known:1; 146 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0}; 147 148 static void __init acpi_request_region (struct acpi_generic_address *addr, 149 unsigned int length, char *desc) 150 { 151 struct resource *res; 152 153 if (!addr->address || !length) 154 return; 155 156 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 157 res = request_region(addr->address, length, desc); 158 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 159 res = request_mem_region(addr->address, length, desc); 160 } 161 162 static int __init acpi_reserve_resources(void) 163 { 164 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 165 "ACPI PM1a_EVT_BLK"); 166 167 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 168 "ACPI PM1b_EVT_BLK"); 169 170 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 171 "ACPI PM1a_CNT_BLK"); 172 173 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 174 "ACPI PM1b_CNT_BLK"); 175 176 if (acpi_gbl_FADT.pm_timer_length == 4) 177 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 178 179 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 180 "ACPI PM2_CNT_BLK"); 181 182 /* Length of GPE blocks must be a non-negative multiple of 2 */ 183 184 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 185 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 186 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 187 188 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 189 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 190 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 191 192 return 0; 193 } 194 device_initcall(acpi_reserve_resources); 195 196 acpi_status __init acpi_os_initialize(void) 197 { 198 return AE_OK; 199 } 200 201 acpi_status acpi_os_initialize1(void) 202 { 203 kacpid_wq = create_singlethread_workqueue("kacpid"); 204 kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify"); 205 BUG_ON(!kacpid_wq); 206 BUG_ON(!kacpi_notify_wq); 207 return AE_OK; 208 } 209 210 acpi_status acpi_os_terminate(void) 211 { 212 if (acpi_irq_handler) { 213 acpi_os_remove_interrupt_handler(acpi_irq_irq, 214 acpi_irq_handler); 215 } 216 217 destroy_workqueue(kacpid_wq); 218 destroy_workqueue(kacpi_notify_wq); 219 220 return AE_OK; 221 } 222 223 void acpi_os_printf(const char *fmt, ...) 224 { 225 va_list args; 226 va_start(args, fmt); 227 acpi_os_vprintf(fmt, args); 228 va_end(args); 229 } 230 231 void acpi_os_vprintf(const char *fmt, va_list args) 232 { 233 static char buffer[512]; 234 235 vsprintf(buffer, fmt, args); 236 237 #ifdef ENABLE_DEBUGGER 238 if (acpi_in_debugger) { 239 kdb_printf("%s", buffer); 240 } else { 241 printk("%s", buffer); 242 } 243 #else 244 printk("%s", buffer); 245 #endif 246 } 247 248 acpi_physical_address __init acpi_os_get_root_pointer(void) 249 { 250 if (efi_enabled) { 251 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 252 return efi.acpi20; 253 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 254 return efi.acpi; 255 else { 256 printk(KERN_ERR PREFIX 257 "System description tables not found\n"); 258 return 0; 259 } 260 } else { 261 acpi_physical_address pa = 0; 262 263 acpi_find_root_pointer(&pa); 264 return pa; 265 } 266 } 267 268 void __iomem *__init_refok 269 acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 270 { 271 if (phys > ULONG_MAX) { 272 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 273 return NULL; 274 } 275 if (acpi_gbl_permanent_mmap) 276 /* 277 * ioremap checks to ensure this is in reserved space 278 */ 279 return ioremap((unsigned long)phys, size); 280 else 281 return __acpi_map_table((unsigned long)phys, size); 282 } 283 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 284 285 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size) 286 { 287 if (acpi_gbl_permanent_mmap) { 288 iounmap(virt); 289 } 290 } 291 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 292 293 #ifdef ACPI_FUTURE_USAGE 294 acpi_status 295 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 296 { 297 if (!phys || !virt) 298 return AE_BAD_PARAMETER; 299 300 *phys = virt_to_phys(virt); 301 302 return AE_OK; 303 } 304 #endif 305 306 #define ACPI_MAX_OVERRIDE_LEN 100 307 308 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 309 310 acpi_status 311 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 312 acpi_string * new_val) 313 { 314 if (!init_val || !new_val) 315 return AE_BAD_PARAMETER; 316 317 *new_val = NULL; 318 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 319 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 320 acpi_os_name); 321 *new_val = acpi_os_name; 322 } 323 324 return AE_OK; 325 } 326 327 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD 328 struct acpi_table_header *acpi_find_dsdt_initrd(void) 329 { 330 struct file *firmware_file; 331 mm_segment_t oldfs; 332 unsigned long len, len2; 333 struct acpi_table_header *dsdt_buffer, *ret = NULL; 334 struct kstat stat; 335 char *ramfs_dsdt_name = "/DSDT.aml"; 336 337 printk(KERN_INFO PREFIX "Checking initramfs for custom DSDT\n"); 338 339 /* 340 * Never do this at home, only the user-space is allowed to open a file. 341 * The clean way would be to use the firmware loader. 342 * But this code must be run before there is any userspace available. 343 * A static/init firmware infrastructure doesn't exist yet... 344 */ 345 if (vfs_stat(ramfs_dsdt_name, &stat) < 0) 346 return ret; 347 348 len = stat.size; 349 /* check especially against empty files */ 350 if (len <= 4) { 351 printk(KERN_ERR PREFIX "Failed: DSDT only %lu bytes.\n", len); 352 return ret; 353 } 354 355 firmware_file = filp_open(ramfs_dsdt_name, O_RDONLY, 0); 356 if (IS_ERR(firmware_file)) { 357 printk(KERN_ERR PREFIX "Failed to open %s.\n", ramfs_dsdt_name); 358 return ret; 359 } 360 361 dsdt_buffer = kmalloc(len, GFP_ATOMIC); 362 if (!dsdt_buffer) { 363 printk(KERN_ERR PREFIX "Failed to allocate %lu bytes.\n", len); 364 goto err; 365 } 366 367 oldfs = get_fs(); 368 set_fs(KERNEL_DS); 369 len2 = vfs_read(firmware_file, (char __user *)dsdt_buffer, len, 370 &firmware_file->f_pos); 371 set_fs(oldfs); 372 if (len2 < len) { 373 printk(KERN_ERR PREFIX "Failed to read %lu bytes from %s.\n", 374 len, ramfs_dsdt_name); 375 ACPI_FREE(dsdt_buffer); 376 goto err; 377 } 378 379 printk(KERN_INFO PREFIX "Found %lu byte DSDT in %s.\n", 380 len, ramfs_dsdt_name); 381 ret = dsdt_buffer; 382 err: 383 filp_close(firmware_file, NULL); 384 return ret; 385 } 386 #endif 387 388 acpi_status 389 acpi_os_table_override(struct acpi_table_header * existing_table, 390 struct acpi_table_header ** new_table) 391 { 392 if (!existing_table || !new_table) 393 return AE_BAD_PARAMETER; 394 395 *new_table = NULL; 396 397 #ifdef CONFIG_ACPI_CUSTOM_DSDT 398 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 399 *new_table = (struct acpi_table_header *)AmlCode; 400 #endif 401 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD 402 if ((strncmp(existing_table->signature, "DSDT", 4) == 0) && 403 !acpi_no_initrd_override) { 404 struct acpi_table_header *initrd_table; 405 406 initrd_table = acpi_find_dsdt_initrd(); 407 if (initrd_table) 408 *new_table = initrd_table; 409 } 410 #endif 411 if (*new_table != NULL) { 412 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], " 413 "this is unsafe: tainting kernel\n", 414 existing_table->signature, 415 existing_table->oem_table_id); 416 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE); 417 } 418 return AE_OK; 419 } 420 421 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD 422 int __init acpi_no_initrd_override_setup(char *s) 423 { 424 acpi_no_initrd_override = 1; 425 return 1; 426 } 427 __setup("acpi_no_initrd_override", acpi_no_initrd_override_setup); 428 #endif 429 430 static irqreturn_t acpi_irq(int irq, void *dev_id) 431 { 432 u32 handled; 433 434 handled = (*acpi_irq_handler) (acpi_irq_context); 435 436 if (handled) { 437 acpi_irq_handled++; 438 return IRQ_HANDLED; 439 } else 440 return IRQ_NONE; 441 } 442 443 acpi_status 444 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 445 void *context) 446 { 447 unsigned int irq; 448 449 acpi_irq_stats_init(); 450 451 /* 452 * Ignore the GSI from the core, and use the value in our copy of the 453 * FADT. It may not be the same if an interrupt source override exists 454 * for the SCI. 455 */ 456 gsi = acpi_gbl_FADT.sci_interrupt; 457 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 458 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 459 gsi); 460 return AE_OK; 461 } 462 463 acpi_irq_handler = handler; 464 acpi_irq_context = context; 465 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 466 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 467 return AE_NOT_ACQUIRED; 468 } 469 acpi_irq_irq = irq; 470 471 return AE_OK; 472 } 473 474 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 475 { 476 if (irq) { 477 free_irq(irq, acpi_irq); 478 acpi_irq_handler = NULL; 479 acpi_irq_irq = 0; 480 } 481 482 return AE_OK; 483 } 484 485 /* 486 * Running in interpreter thread context, safe to sleep 487 */ 488 489 void acpi_os_sleep(acpi_integer ms) 490 { 491 schedule_timeout_interruptible(msecs_to_jiffies(ms)); 492 } 493 494 void acpi_os_stall(u32 us) 495 { 496 while (us) { 497 u32 delay = 1000; 498 499 if (delay > us) 500 delay = us; 501 udelay(delay); 502 touch_nmi_watchdog(); 503 us -= delay; 504 } 505 } 506 507 /* 508 * Support ACPI 3.0 AML Timer operand 509 * Returns 64-bit free-running, monotonically increasing timer 510 * with 100ns granularity 511 */ 512 u64 acpi_os_get_timer(void) 513 { 514 static u64 t; 515 516 #ifdef CONFIG_HPET 517 /* TBD: use HPET if available */ 518 #endif 519 520 #ifdef CONFIG_X86_PM_TIMER 521 /* TBD: default to PM timer if HPET was not available */ 522 #endif 523 if (!t) 524 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n"); 525 526 return ++t; 527 } 528 529 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 530 { 531 u32 dummy; 532 533 if (!value) 534 value = &dummy; 535 536 *value = 0; 537 if (width <= 8) { 538 *(u8 *) value = inb(port); 539 } else if (width <= 16) { 540 *(u16 *) value = inw(port); 541 } else if (width <= 32) { 542 *(u32 *) value = inl(port); 543 } else { 544 BUG(); 545 } 546 547 return AE_OK; 548 } 549 550 EXPORT_SYMBOL(acpi_os_read_port); 551 552 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 553 { 554 if (width <= 8) { 555 outb(value, port); 556 } else if (width <= 16) { 557 outw(value, port); 558 } else if (width <= 32) { 559 outl(value, port); 560 } else { 561 BUG(); 562 } 563 564 return AE_OK; 565 } 566 567 EXPORT_SYMBOL(acpi_os_write_port); 568 569 acpi_status 570 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width) 571 { 572 u32 dummy; 573 void __iomem *virt_addr; 574 575 virt_addr = ioremap(phys_addr, width); 576 if (!value) 577 value = &dummy; 578 579 switch (width) { 580 case 8: 581 *(u8 *) value = readb(virt_addr); 582 break; 583 case 16: 584 *(u16 *) value = readw(virt_addr); 585 break; 586 case 32: 587 *(u32 *) value = readl(virt_addr); 588 break; 589 default: 590 BUG(); 591 } 592 593 iounmap(virt_addr); 594 595 return AE_OK; 596 } 597 598 acpi_status 599 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width) 600 { 601 void __iomem *virt_addr; 602 603 virt_addr = ioremap(phys_addr, width); 604 605 switch (width) { 606 case 8: 607 writeb(value, virt_addr); 608 break; 609 case 16: 610 writew(value, virt_addr); 611 break; 612 case 32: 613 writel(value, virt_addr); 614 break; 615 default: 616 BUG(); 617 } 618 619 iounmap(virt_addr); 620 621 return AE_OK; 622 } 623 624 acpi_status 625 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 626 void *value, u32 width) 627 { 628 int result, size; 629 630 if (!value) 631 return AE_BAD_PARAMETER; 632 633 switch (width) { 634 case 8: 635 size = 1; 636 break; 637 case 16: 638 size = 2; 639 break; 640 case 32: 641 size = 4; 642 break; 643 default: 644 return AE_ERROR; 645 } 646 647 result = raw_pci_read(pci_id->segment, pci_id->bus, 648 PCI_DEVFN(pci_id->device, pci_id->function), 649 reg, size, value); 650 651 return (result ? AE_ERROR : AE_OK); 652 } 653 654 acpi_status 655 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 656 acpi_integer value, u32 width) 657 { 658 int result, size; 659 660 switch (width) { 661 case 8: 662 size = 1; 663 break; 664 case 16: 665 size = 2; 666 break; 667 case 32: 668 size = 4; 669 break; 670 default: 671 return AE_ERROR; 672 } 673 674 result = raw_pci_write(pci_id->segment, pci_id->bus, 675 PCI_DEVFN(pci_id->device, pci_id->function), 676 reg, size, value); 677 678 return (result ? AE_ERROR : AE_OK); 679 } 680 681 /* TODO: Change code to take advantage of driver model more */ 682 static void acpi_os_derive_pci_id_2(acpi_handle rhandle, /* upper bound */ 683 acpi_handle chandle, /* current node */ 684 struct acpi_pci_id **id, 685 int *is_bridge, u8 * bus_number) 686 { 687 acpi_handle handle; 688 struct acpi_pci_id *pci_id = *id; 689 acpi_status status; 690 unsigned long temp; 691 acpi_object_type type; 692 u8 tu8; 693 694 acpi_get_parent(chandle, &handle); 695 if (handle != rhandle) { 696 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge, 697 bus_number); 698 699 status = acpi_get_type(handle, &type); 700 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE)) 701 return; 702 703 status = 704 acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, 705 &temp); 706 if (ACPI_SUCCESS(status)) { 707 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp)); 708 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp)); 709 710 if (*is_bridge) 711 pci_id->bus = *bus_number; 712 713 /* any nicer way to get bus number of bridge ? */ 714 status = 715 acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8, 716 8); 717 if (ACPI_SUCCESS(status) 718 && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) { 719 status = 720 acpi_os_read_pci_configuration(pci_id, 0x18, 721 &tu8, 8); 722 if (!ACPI_SUCCESS(status)) { 723 /* Certainly broken... FIX ME */ 724 return; 725 } 726 *is_bridge = 1; 727 pci_id->bus = tu8; 728 status = 729 acpi_os_read_pci_configuration(pci_id, 0x19, 730 &tu8, 8); 731 if (ACPI_SUCCESS(status)) { 732 *bus_number = tu8; 733 } 734 } else 735 *is_bridge = 0; 736 } 737 } 738 } 739 740 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound */ 741 acpi_handle chandle, /* current node */ 742 struct acpi_pci_id **id) 743 { 744 int is_bridge = 1; 745 u8 bus_number = (*id)->bus; 746 747 acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number); 748 } 749 750 static void acpi_os_execute_deferred(struct work_struct *work) 751 { 752 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 753 if (!dpc) { 754 printk(KERN_ERR PREFIX "Invalid (NULL) context\n"); 755 return; 756 } 757 758 dpc->function(dpc->context); 759 kfree(dpc); 760 761 return; 762 } 763 764 /******************************************************************************* 765 * 766 * FUNCTION: acpi_os_execute 767 * 768 * PARAMETERS: Type - Type of the callback 769 * Function - Function to be executed 770 * Context - Function parameters 771 * 772 * RETURN: Status 773 * 774 * DESCRIPTION: Depending on type, either queues function for deferred execution or 775 * immediately executes function on a separate thread. 776 * 777 ******************************************************************************/ 778 779 acpi_status acpi_os_execute(acpi_execute_type type, 780 acpi_osd_exec_callback function, void *context) 781 { 782 acpi_status status = AE_OK; 783 struct acpi_os_dpc *dpc; 784 struct workqueue_struct *queue; 785 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 786 "Scheduling function [%p(%p)] for deferred execution.\n", 787 function, context)); 788 789 if (!function) 790 return AE_BAD_PARAMETER; 791 792 /* 793 * Allocate/initialize DPC structure. Note that this memory will be 794 * freed by the callee. The kernel handles the work_struct list in a 795 * way that allows us to also free its memory inside the callee. 796 * Because we may want to schedule several tasks with different 797 * parameters we can't use the approach some kernel code uses of 798 * having a static work_struct. 799 */ 800 801 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 802 if (!dpc) 803 return_ACPI_STATUS(AE_NO_MEMORY); 804 805 dpc->function = function; 806 dpc->context = context; 807 808 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 809 queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq; 810 if (!queue_work(queue, &dpc->work)) { 811 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 812 "Call to queue_work() failed.\n")); 813 status = AE_ERROR; 814 kfree(dpc); 815 } 816 return_ACPI_STATUS(status); 817 } 818 819 EXPORT_SYMBOL(acpi_os_execute); 820 821 void acpi_os_wait_events_complete(void *context) 822 { 823 flush_workqueue(kacpid_wq); 824 } 825 826 EXPORT_SYMBOL(acpi_os_wait_events_complete); 827 828 /* 829 * Allocate the memory for a spinlock and initialize it. 830 */ 831 acpi_status acpi_os_create_lock(acpi_spinlock * handle) 832 { 833 spin_lock_init(*handle); 834 835 return AE_OK; 836 } 837 838 /* 839 * Deallocate the memory for a spinlock. 840 */ 841 void acpi_os_delete_lock(acpi_spinlock handle) 842 { 843 return; 844 } 845 846 acpi_status 847 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 848 { 849 struct semaphore *sem = NULL; 850 851 852 sem = acpi_os_allocate(sizeof(struct semaphore)); 853 if (!sem) 854 return AE_NO_MEMORY; 855 memset(sem, 0, sizeof(struct semaphore)); 856 857 sema_init(sem, initial_units); 858 859 *handle = (acpi_handle *) sem; 860 861 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 862 *handle, initial_units)); 863 864 return AE_OK; 865 } 866 867 /* 868 * TODO: A better way to delete semaphores? Linux doesn't have a 869 * 'delete_semaphore()' function -- may result in an invalid 870 * pointer dereference for non-synchronized consumers. Should 871 * we at least check for blocked threads and signal/cancel them? 872 */ 873 874 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 875 { 876 struct semaphore *sem = (struct semaphore *)handle; 877 878 879 if (!sem) 880 return AE_BAD_PARAMETER; 881 882 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 883 884 kfree(sem); 885 sem = NULL; 886 887 return AE_OK; 888 } 889 890 /* 891 * TODO: The kernel doesn't have a 'down_timeout' function -- had to 892 * improvise. The process is to sleep for one scheduler quantum 893 * until the semaphore becomes available. Downside is that this 894 * may result in starvation for timeout-based waits when there's 895 * lots of semaphore activity. 896 * 897 * TODO: Support for units > 1? 898 */ 899 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 900 { 901 acpi_status status = AE_OK; 902 struct semaphore *sem = (struct semaphore *)handle; 903 int ret = 0; 904 905 906 if (!sem || (units < 1)) 907 return AE_BAD_PARAMETER; 908 909 if (units > 1) 910 return AE_SUPPORT; 911 912 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 913 handle, units, timeout)); 914 915 /* 916 * This can be called during resume with interrupts off. 917 * Like boot-time, we should be single threaded and will 918 * always get the lock if we try -- timeout or not. 919 * If this doesn't succeed, then we will oops courtesy of 920 * might_sleep() in down(). 921 */ 922 if (!down_trylock(sem)) 923 return AE_OK; 924 925 switch (timeout) { 926 /* 927 * No Wait: 928 * -------- 929 * A zero timeout value indicates that we shouldn't wait - just 930 * acquire the semaphore if available otherwise return AE_TIME 931 * (a.k.a. 'would block'). 932 */ 933 case 0: 934 if (down_trylock(sem)) 935 status = AE_TIME; 936 break; 937 938 /* 939 * Wait Indefinitely: 940 * ------------------ 941 */ 942 case ACPI_WAIT_FOREVER: 943 down(sem); 944 break; 945 946 /* 947 * Wait w/ Timeout: 948 * ---------------- 949 */ 950 default: 951 // TODO: A better timeout algorithm? 952 { 953 int i = 0; 954 static const int quantum_ms = 1000 / HZ; 955 956 ret = down_trylock(sem); 957 for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) { 958 schedule_timeout_interruptible(1); 959 ret = down_trylock(sem); 960 } 961 962 if (ret != 0) 963 status = AE_TIME; 964 } 965 break; 966 } 967 968 if (ACPI_FAILURE(status)) { 969 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 970 "Failed to acquire semaphore[%p|%d|%d], %s", 971 handle, units, timeout, 972 acpi_format_exception(status))); 973 } else { 974 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 975 "Acquired semaphore[%p|%d|%d]", handle, 976 units, timeout)); 977 } 978 979 return status; 980 } 981 982 /* 983 * TODO: Support for units > 1? 984 */ 985 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 986 { 987 struct semaphore *sem = (struct semaphore *)handle; 988 989 990 if (!sem || (units < 1)) 991 return AE_BAD_PARAMETER; 992 993 if (units > 1) 994 return AE_SUPPORT; 995 996 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 997 units)); 998 999 up(sem); 1000 1001 return AE_OK; 1002 } 1003 1004 #ifdef ACPI_FUTURE_USAGE 1005 u32 acpi_os_get_line(char *buffer) 1006 { 1007 1008 #ifdef ENABLE_DEBUGGER 1009 if (acpi_in_debugger) { 1010 u32 chars; 1011 1012 kdb_read(buffer, sizeof(line_buf)); 1013 1014 /* remove the CR kdb includes */ 1015 chars = strlen(buffer) - 1; 1016 buffer[chars] = '\0'; 1017 } 1018 #endif 1019 1020 return 0; 1021 } 1022 #endif /* ACPI_FUTURE_USAGE */ 1023 1024 acpi_status acpi_os_signal(u32 function, void *info) 1025 { 1026 switch (function) { 1027 case ACPI_SIGNAL_FATAL: 1028 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 1029 break; 1030 case ACPI_SIGNAL_BREAKPOINT: 1031 /* 1032 * AML Breakpoint 1033 * ACPI spec. says to treat it as a NOP unless 1034 * you are debugging. So if/when we integrate 1035 * AML debugger into the kernel debugger its 1036 * hook will go here. But until then it is 1037 * not useful to print anything on breakpoints. 1038 */ 1039 break; 1040 default: 1041 break; 1042 } 1043 1044 return AE_OK; 1045 } 1046 1047 static int __init acpi_os_name_setup(char *str) 1048 { 1049 char *p = acpi_os_name; 1050 int count = ACPI_MAX_OVERRIDE_LEN - 1; 1051 1052 if (!str || !*str) 1053 return 0; 1054 1055 for (; count-- && str && *str; str++) { 1056 if (isalnum(*str) || *str == ' ' || *str == ':') 1057 *p++ = *str; 1058 else if (*str == '\'' || *str == '"') 1059 continue; 1060 else 1061 break; 1062 } 1063 *p = 0; 1064 1065 return 1; 1066 1067 } 1068 1069 __setup("acpi_os_name=", acpi_os_name_setup); 1070 1071 static void __init set_osi_linux(unsigned int enable) 1072 { 1073 if (osi_linux.enable != enable) { 1074 osi_linux.enable = enable; 1075 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n", 1076 enable ? "Add": "Delet"); 1077 } 1078 return; 1079 } 1080 1081 static void __init acpi_cmdline_osi_linux(unsigned int enable) 1082 { 1083 osi_linux.cmdline = 1; /* cmdline set the default */ 1084 set_osi_linux(enable); 1085 1086 return; 1087 } 1088 1089 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 1090 { 1091 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 1092 1093 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 1094 1095 if (enable == -1) 1096 return; 1097 1098 osi_linux.known = 1; /* DMI knows which OSI(Linux) default needed */ 1099 1100 set_osi_linux(enable); 1101 1102 return; 1103 } 1104 1105 /* 1106 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1107 * 1108 * empty string disables _OSI 1109 * string starting with '!' disables that string 1110 * otherwise string is added to list, augmenting built-in strings 1111 */ 1112 static int __init acpi_osi_setup(char *str) 1113 { 1114 if (str == NULL || *str == '\0') { 1115 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1116 acpi_gbl_create_osi_method = FALSE; 1117 } else if (!strcmp("!Linux", str)) { 1118 acpi_cmdline_osi_linux(0); /* !enable */ 1119 } else if (*str == '!') { 1120 if (acpi_osi_invalidate(++str) == AE_OK) 1121 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1122 } else if (!strcmp("Linux", str)) { 1123 acpi_cmdline_osi_linux(1); /* enable */ 1124 } else if (*osi_additional_string == '\0') { 1125 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX); 1126 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1127 } 1128 1129 return 1; 1130 } 1131 1132 __setup("acpi_osi=", acpi_osi_setup); 1133 1134 /* enable serialization to combat AE_ALREADY_EXISTS errors */ 1135 static int __init acpi_serialize_setup(char *str) 1136 { 1137 printk(KERN_INFO PREFIX "serialize enabled\n"); 1138 1139 acpi_gbl_all_methods_serialized = TRUE; 1140 1141 return 1; 1142 } 1143 1144 __setup("acpi_serialize", acpi_serialize_setup); 1145 1146 /* 1147 * Wake and Run-Time GPES are expected to be separate. 1148 * We disable wake-GPEs at run-time to prevent spurious 1149 * interrupts. 1150 * 1151 * However, if a system exists that shares Wake and 1152 * Run-time events on the same GPE this flag is available 1153 * to tell Linux to keep the wake-time GPEs enabled at run-time. 1154 */ 1155 static int __init acpi_wake_gpes_always_on_setup(char *str) 1156 { 1157 printk(KERN_INFO PREFIX "wake GPEs not disabled\n"); 1158 1159 acpi_gbl_leave_wake_gpes_disabled = FALSE; 1160 1161 return 1; 1162 } 1163 1164 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup); 1165 1166 /* Check of resource interference between native drivers and ACPI 1167 * OperationRegions (SystemIO and System Memory only). 1168 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1169 * in arbitrary AML code and can interfere with legacy drivers. 1170 * acpi_enforce_resources= can be set to: 1171 * 1172 * - strict (2) 1173 * -> further driver trying to access the resources will not load 1174 * - lax (default) (1) 1175 * -> further driver trying to access the resources will load, but you 1176 * get a system message that something might go wrong... 1177 * 1178 * - no (0) 1179 * -> ACPI Operation Region resources will not be registered 1180 * 1181 */ 1182 #define ENFORCE_RESOURCES_STRICT 2 1183 #define ENFORCE_RESOURCES_LAX 1 1184 #define ENFORCE_RESOURCES_NO 0 1185 1186 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1187 1188 static int __init acpi_enforce_resources_setup(char *str) 1189 { 1190 if (str == NULL || *str == '\0') 1191 return 0; 1192 1193 if (!strcmp("strict", str)) 1194 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1195 else if (!strcmp("lax", str)) 1196 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1197 else if (!strcmp("no", str)) 1198 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1199 1200 return 1; 1201 } 1202 1203 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1204 1205 /* Check for resource conflicts between ACPI OperationRegions and native 1206 * drivers */ 1207 int acpi_check_resource_conflict(struct resource *res) 1208 { 1209 struct acpi_res_list *res_list_elem; 1210 int ioport; 1211 int clash = 0; 1212 1213 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1214 return 0; 1215 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1216 return 0; 1217 1218 ioport = res->flags & IORESOURCE_IO; 1219 1220 spin_lock(&acpi_res_lock); 1221 list_for_each_entry(res_list_elem, &resource_list_head, 1222 resource_list) { 1223 if (ioport && (res_list_elem->resource_type 1224 != ACPI_ADR_SPACE_SYSTEM_IO)) 1225 continue; 1226 if (!ioport && (res_list_elem->resource_type 1227 != ACPI_ADR_SPACE_SYSTEM_MEMORY)) 1228 continue; 1229 1230 if (res->end < res_list_elem->start 1231 || res_list_elem->end < res->start) 1232 continue; 1233 clash = 1; 1234 break; 1235 } 1236 spin_unlock(&acpi_res_lock); 1237 1238 if (clash) { 1239 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1240 printk(KERN_INFO "%sACPI: %s resource %s [0x%llx-0x%llx]" 1241 " conflicts with ACPI region %s" 1242 " [0x%llx-0x%llx]\n", 1243 acpi_enforce_resources == ENFORCE_RESOURCES_LAX 1244 ? KERN_WARNING : KERN_ERR, 1245 ioport ? "I/O" : "Memory", res->name, 1246 (long long) res->start, (long long) res->end, 1247 res_list_elem->name, 1248 (long long) res_list_elem->start, 1249 (long long) res_list_elem->end); 1250 printk(KERN_INFO "ACPI: Device needs an ACPI driver\n"); 1251 } 1252 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1253 return -EBUSY; 1254 } 1255 return 0; 1256 } 1257 EXPORT_SYMBOL(acpi_check_resource_conflict); 1258 1259 int acpi_check_region(resource_size_t start, resource_size_t n, 1260 const char *name) 1261 { 1262 struct resource res = { 1263 .start = start, 1264 .end = start + n - 1, 1265 .name = name, 1266 .flags = IORESOURCE_IO, 1267 }; 1268 1269 return acpi_check_resource_conflict(&res); 1270 } 1271 EXPORT_SYMBOL(acpi_check_region); 1272 1273 int acpi_check_mem_region(resource_size_t start, resource_size_t n, 1274 const char *name) 1275 { 1276 struct resource res = { 1277 .start = start, 1278 .end = start + n - 1, 1279 .name = name, 1280 .flags = IORESOURCE_MEM, 1281 }; 1282 1283 return acpi_check_resource_conflict(&res); 1284 1285 } 1286 EXPORT_SYMBOL(acpi_check_mem_region); 1287 1288 /* 1289 * Acquire a spinlock. 1290 * 1291 * handle is a pointer to the spinlock_t. 1292 */ 1293 1294 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1295 { 1296 acpi_cpu_flags flags; 1297 spin_lock_irqsave(lockp, flags); 1298 return flags; 1299 } 1300 1301 /* 1302 * Release a spinlock. See above. 1303 */ 1304 1305 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1306 { 1307 spin_unlock_irqrestore(lockp, flags); 1308 } 1309 1310 #ifndef ACPI_USE_LOCAL_CACHE 1311 1312 /******************************************************************************* 1313 * 1314 * FUNCTION: acpi_os_create_cache 1315 * 1316 * PARAMETERS: name - Ascii name for the cache 1317 * size - Size of each cached object 1318 * depth - Maximum depth of the cache (in objects) <ignored> 1319 * cache - Where the new cache object is returned 1320 * 1321 * RETURN: status 1322 * 1323 * DESCRIPTION: Create a cache object 1324 * 1325 ******************************************************************************/ 1326 1327 acpi_status 1328 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1329 { 1330 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1331 if (*cache == NULL) 1332 return AE_ERROR; 1333 else 1334 return AE_OK; 1335 } 1336 1337 /******************************************************************************* 1338 * 1339 * FUNCTION: acpi_os_purge_cache 1340 * 1341 * PARAMETERS: Cache - Handle to cache object 1342 * 1343 * RETURN: Status 1344 * 1345 * DESCRIPTION: Free all objects within the requested cache. 1346 * 1347 ******************************************************************************/ 1348 1349 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1350 { 1351 kmem_cache_shrink(cache); 1352 return (AE_OK); 1353 } 1354 1355 /******************************************************************************* 1356 * 1357 * FUNCTION: acpi_os_delete_cache 1358 * 1359 * PARAMETERS: Cache - Handle to cache object 1360 * 1361 * RETURN: Status 1362 * 1363 * DESCRIPTION: Free all objects within the requested cache and delete the 1364 * cache object. 1365 * 1366 ******************************************************************************/ 1367 1368 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1369 { 1370 kmem_cache_destroy(cache); 1371 return (AE_OK); 1372 } 1373 1374 /******************************************************************************* 1375 * 1376 * FUNCTION: acpi_os_release_object 1377 * 1378 * PARAMETERS: Cache - Handle to cache object 1379 * Object - The object to be released 1380 * 1381 * RETURN: None 1382 * 1383 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1384 * the object is deleted. 1385 * 1386 ******************************************************************************/ 1387 1388 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1389 { 1390 kmem_cache_free(cache, object); 1391 return (AE_OK); 1392 } 1393 1394 /** 1395 * acpi_dmi_dump - dump DMI slots needed for blacklist entry 1396 * 1397 * Returns 0 on success 1398 */ 1399 static int acpi_dmi_dump(void) 1400 { 1401 1402 if (!dmi_available) 1403 return -1; 1404 1405 printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n", 1406 dmi_get_system_info(DMI_SYS_VENDOR)); 1407 printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n", 1408 dmi_get_system_info(DMI_PRODUCT_NAME)); 1409 printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n", 1410 dmi_get_system_info(DMI_PRODUCT_VERSION)); 1411 printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n", 1412 dmi_get_system_info(DMI_BOARD_NAME)); 1413 printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n", 1414 dmi_get_system_info(DMI_BIOS_VENDOR)); 1415 printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n", 1416 dmi_get_system_info(DMI_BIOS_DATE)); 1417 1418 return 0; 1419 } 1420 1421 1422 /****************************************************************************** 1423 * 1424 * FUNCTION: acpi_os_validate_interface 1425 * 1426 * PARAMETERS: interface - Requested interface to be validated 1427 * 1428 * RETURN: AE_OK if interface is supported, AE_SUPPORT otherwise 1429 * 1430 * DESCRIPTION: Match an interface string to the interfaces supported by the 1431 * host. Strings originate from an AML call to the _OSI method. 1432 * 1433 *****************************************************************************/ 1434 1435 acpi_status 1436 acpi_os_validate_interface (char *interface) 1437 { 1438 if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX)) 1439 return AE_OK; 1440 if (!strcmp("Linux", interface)) { 1441 1442 printk(KERN_NOTICE PREFIX 1443 "BIOS _OSI(Linux) query %s%s\n", 1444 osi_linux.enable ? "honored" : "ignored", 1445 osi_linux.cmdline ? " via cmdline" : 1446 osi_linux.dmi ? " via DMI" : ""); 1447 1448 if (!osi_linux.dmi) { 1449 if (acpi_dmi_dump()) 1450 printk(KERN_NOTICE PREFIX 1451 "[please extract dmidecode output]\n"); 1452 printk(KERN_NOTICE PREFIX 1453 "Please send DMI info above to " 1454 "linux-acpi@vger.kernel.org\n"); 1455 } 1456 if (!osi_linux.known && !osi_linux.cmdline) { 1457 printk(KERN_NOTICE PREFIX 1458 "If \"acpi_osi=%sLinux\" works better, " 1459 "please notify linux-acpi@vger.kernel.org\n", 1460 osi_linux.enable ? "!" : ""); 1461 } 1462 1463 if (osi_linux.enable) 1464 return AE_OK; 1465 } 1466 return AE_SUPPORT; 1467 } 1468 1469 /****************************************************************************** 1470 * 1471 * FUNCTION: acpi_os_validate_address 1472 * 1473 * PARAMETERS: space_id - ACPI space ID 1474 * address - Physical address 1475 * length - Address length 1476 * 1477 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise, 1478 * should return AE_AML_ILLEGAL_ADDRESS. 1479 * 1480 * DESCRIPTION: Validate a system address via the host OS. Used to validate 1481 * the addresses accessed by AML operation regions. 1482 * 1483 *****************************************************************************/ 1484 1485 acpi_status 1486 acpi_os_validate_address ( 1487 u8 space_id, 1488 acpi_physical_address address, 1489 acpi_size length, 1490 char *name) 1491 { 1492 struct acpi_res_list *res; 1493 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1494 return AE_OK; 1495 1496 switch (space_id) { 1497 case ACPI_ADR_SPACE_SYSTEM_IO: 1498 case ACPI_ADR_SPACE_SYSTEM_MEMORY: 1499 /* Only interference checks against SystemIO and SytemMemory 1500 are needed */ 1501 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL); 1502 if (!res) 1503 return AE_OK; 1504 /* ACPI names are fixed to 4 bytes, still better use strlcpy */ 1505 strlcpy(res->name, name, 5); 1506 res->start = address; 1507 res->end = address + length - 1; 1508 res->resource_type = space_id; 1509 spin_lock(&acpi_res_lock); 1510 list_add(&res->resource_list, &resource_list_head); 1511 spin_unlock(&acpi_res_lock); 1512 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, " 1513 "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO) 1514 ? "SystemIO" : "System Memory", 1515 (unsigned long long)res->start, 1516 (unsigned long long)res->end, 1517 res->name); 1518 break; 1519 case ACPI_ADR_SPACE_PCI_CONFIG: 1520 case ACPI_ADR_SPACE_EC: 1521 case ACPI_ADR_SPACE_SMBUS: 1522 case ACPI_ADR_SPACE_CMOS: 1523 case ACPI_ADR_SPACE_PCI_BAR_TARGET: 1524 case ACPI_ADR_SPACE_DATA_TABLE: 1525 case ACPI_ADR_SPACE_FIXED_HARDWARE: 1526 break; 1527 } 1528 return AE_OK; 1529 } 1530 1531 #endif 1532