Merge branch 'acpi-lpss'
[linux-3.10.git] / drivers / acpi / osl.c
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  *  Copyright (c) 2008 Intel Corporation
8  *   Author: Matthew Wilcox <willy@linux.intel.com>
9  *
10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11  *
12  *  This program is free software; you can redistribute it and/or modify
13  *  it under the terms of the GNU General Public License as published by
14  *  the Free Software Foundation; either version 2 of the License, or
15  *  (at your option) any later version.
16  *
17  *  This program is distributed in the hope that it will be useful,
18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  *  GNU General Public License for more details.
21  *
22  *  You should have received a copy of the GNU General Public License
23  *  along with this program; if not, write to the Free Software
24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
25  *
26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27  *
28  */
29
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/mm.h>
34 #include <linux/highmem.h>
35 #include <linux/pci.h>
36 #include <linux/interrupt.h>
37 #include <linux/kmod.h>
38 #include <linux/delay.h>
39 #include <linux/workqueue.h>
40 #include <linux/nmi.h>
41 #include <linux/acpi.h>
42 #include <linux/acpi_io.h>
43 #include <linux/efi.h>
44 #include <linux/ioport.h>
45 #include <linux/list.h>
46 #include <linux/jiffies.h>
47 #include <linux/semaphore.h>
48
49 #include <asm/io.h>
50 #include <asm/uaccess.h>
51
52 #include <acpi/acpi.h>
53 #include <acpi/acpi_bus.h>
54 #include <acpi/processor.h>
55
56 #define _COMPONENT              ACPI_OS_SERVICES
57 ACPI_MODULE_NAME("osl");
58 #define PREFIX          "ACPI: "
59 struct acpi_os_dpc {
60         acpi_osd_exec_callback function;
61         void *context;
62         struct work_struct work;
63         int wait;
64 };
65
66 #ifdef CONFIG_ACPI_CUSTOM_DSDT
67 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
68 #endif
69
70 #ifdef ENABLE_DEBUGGER
71 #include <linux/kdb.h>
72
73 /* stuff for debugger support */
74 int acpi_in_debugger;
75 EXPORT_SYMBOL(acpi_in_debugger);
76
77 extern char line_buf[80];
78 #endif                          /*ENABLE_DEBUGGER */
79
80 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
81                                       u32 pm1b_ctrl);
82
83 static acpi_osd_handler acpi_irq_handler;
84 static void *acpi_irq_context;
85 static struct workqueue_struct *kacpid_wq;
86 static struct workqueue_struct *kacpi_notify_wq;
87 struct workqueue_struct *kacpi_hotplug_wq;
88 EXPORT_SYMBOL(kacpi_hotplug_wq);
89
90 /*
91  * This list of permanent mappings is for memory that may be accessed from
92  * interrupt context, where we can't do the ioremap().
93  */
94 struct acpi_ioremap {
95         struct list_head list;
96         void __iomem *virt;
97         acpi_physical_address phys;
98         acpi_size size;
99         unsigned long refcount;
100 };
101
102 static LIST_HEAD(acpi_ioremaps);
103 static DEFINE_MUTEX(acpi_ioremap_lock);
104
105 static void __init acpi_osi_setup_late(void);
106
107 /*
108  * The story of _OSI(Linux)
109  *
110  * From pre-history through Linux-2.6.22,
111  * Linux responded TRUE upon a BIOS OSI(Linux) query.
112  *
113  * Unfortunately, reference BIOS writers got wind of this
114  * and put OSI(Linux) in their example code, quickly exposing
115  * this string as ill-conceived and opening the door to
116  * an un-bounded number of BIOS incompatibilities.
117  *
118  * For example, OSI(Linux) was used on resume to re-POST a
119  * video card on one system, because Linux at that time
120  * could not do a speedy restore in its native driver.
121  * But then upon gaining quick native restore capability,
122  * Linux has no way to tell the BIOS to skip the time-consuming
123  * POST -- putting Linux at a permanent performance disadvantage.
124  * On another system, the BIOS writer used OSI(Linux)
125  * to infer native OS support for IPMI!  On other systems,
126  * OSI(Linux) simply got in the way of Linux claiming to
127  * be compatible with other operating systems, exposing
128  * BIOS issues such as skipped device initialization.
129  *
130  * So "Linux" turned out to be a really poor chose of
131  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
132  *
133  * BIOS writers should NOT query _OSI(Linux) on future systems.
134  * Linux will complain on the console when it sees it, and return FALSE.
135  * To get Linux to return TRUE for your system  will require
136  * a kernel source update to add a DMI entry,
137  * or boot with "acpi_osi=Linux"
138  */
139
140 static struct osi_linux {
141         unsigned int    enable:1;
142         unsigned int    dmi:1;
143         unsigned int    cmdline:1;
144 } osi_linux = {0, 0, 0};
145
146 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
147 {
148         if (!strcmp("Linux", interface)) {
149
150                 printk_once(KERN_NOTICE FW_BUG PREFIX
151                         "BIOS _OSI(Linux) query %s%s\n",
152                         osi_linux.enable ? "honored" : "ignored",
153                         osi_linux.cmdline ? " via cmdline" :
154                         osi_linux.dmi ? " via DMI" : "");
155         }
156
157         return supported;
158 }
159
160 static void __init acpi_request_region (struct acpi_generic_address *gas,
161         unsigned int length, char *desc)
162 {
163         u64 addr;
164
165         /* Handle possible alignment issues */
166         memcpy(&addr, &gas->address, sizeof(addr));
167         if (!addr || !length)
168                 return;
169
170         /* Resources are never freed */
171         if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
172                 request_region(addr, length, desc);
173         else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
174                 request_mem_region(addr, length, desc);
175 }
176
177 static int __init acpi_reserve_resources(void)
178 {
179         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
180                 "ACPI PM1a_EVT_BLK");
181
182         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
183                 "ACPI PM1b_EVT_BLK");
184
185         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
186                 "ACPI PM1a_CNT_BLK");
187
188         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
189                 "ACPI PM1b_CNT_BLK");
190
191         if (acpi_gbl_FADT.pm_timer_length == 4)
192                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
193
194         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
195                 "ACPI PM2_CNT_BLK");
196
197         /* Length of GPE blocks must be a non-negative multiple of 2 */
198
199         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
200                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
201                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
202
203         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
204                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
205                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
206
207         return 0;
208 }
209 device_initcall(acpi_reserve_resources);
210
211 void acpi_os_printf(const char *fmt, ...)
212 {
213         va_list args;
214         va_start(args, fmt);
215         acpi_os_vprintf(fmt, args);
216         va_end(args);
217 }
218
219 void acpi_os_vprintf(const char *fmt, va_list args)
220 {
221         static char buffer[512];
222
223         vsprintf(buffer, fmt, args);
224
225 #ifdef ENABLE_DEBUGGER
226         if (acpi_in_debugger) {
227                 kdb_printf("%s", buffer);
228         } else {
229                 printk(KERN_CONT "%s", buffer);
230         }
231 #else
232         printk(KERN_CONT "%s", buffer);
233 #endif
234 }
235
236 #ifdef CONFIG_KEXEC
237 static unsigned long acpi_rsdp;
238 static int __init setup_acpi_rsdp(char *arg)
239 {
240         acpi_rsdp = simple_strtoul(arg, NULL, 16);
241         return 0;
242 }
243 early_param("acpi_rsdp", setup_acpi_rsdp);
244 #endif
245
246 acpi_physical_address __init acpi_os_get_root_pointer(void)
247 {
248 #ifdef CONFIG_KEXEC
249         if (acpi_rsdp)
250                 return acpi_rsdp;
251 #endif
252
253         if (efi_enabled(EFI_CONFIG_TABLES)) {
254                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
255                         return efi.acpi20;
256                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
257                         return efi.acpi;
258                 else {
259                         printk(KERN_ERR PREFIX
260                                "System description tables not found\n");
261                         return 0;
262                 }
263         } else {
264                 acpi_physical_address pa = 0;
265
266                 acpi_find_root_pointer(&pa);
267                 return pa;
268         }
269 }
270
271 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
272 static struct acpi_ioremap *
273 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
274 {
275         struct acpi_ioremap *map;
276
277         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
278                 if (map->phys <= phys &&
279                     phys + size <= map->phys + map->size)
280                         return map;
281
282         return NULL;
283 }
284
285 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
286 static void __iomem *
287 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
288 {
289         struct acpi_ioremap *map;
290
291         map = acpi_map_lookup(phys, size);
292         if (map)
293                 return map->virt + (phys - map->phys);
294
295         return NULL;
296 }
297
298 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
299 {
300         struct acpi_ioremap *map;
301         void __iomem *virt = NULL;
302
303         mutex_lock(&acpi_ioremap_lock);
304         map = acpi_map_lookup(phys, size);
305         if (map) {
306                 virt = map->virt + (phys - map->phys);
307                 map->refcount++;
308         }
309         mutex_unlock(&acpi_ioremap_lock);
310         return virt;
311 }
312 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
313
314 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
315 static struct acpi_ioremap *
316 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
317 {
318         struct acpi_ioremap *map;
319
320         list_for_each_entry_rcu(map, &acpi_ioremaps, list)
321                 if (map->virt <= virt &&
322                     virt + size <= map->virt + map->size)
323                         return map;
324
325         return NULL;
326 }
327
328 #ifndef CONFIG_IA64
329 #define should_use_kmap(pfn)   page_is_ram(pfn)
330 #else
331 /* ioremap will take care of cache attributes */
332 #define should_use_kmap(pfn)   0
333 #endif
334
335 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
336 {
337         unsigned long pfn;
338
339         pfn = pg_off >> PAGE_SHIFT;
340         if (should_use_kmap(pfn)) {
341                 if (pg_sz > PAGE_SIZE)
342                         return NULL;
343                 return (void __iomem __force *)kmap(pfn_to_page(pfn));
344         } else
345                 return acpi_os_ioremap(pg_off, pg_sz);
346 }
347
348 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
349 {
350         unsigned long pfn;
351
352         pfn = pg_off >> PAGE_SHIFT;
353         if (should_use_kmap(pfn))
354                 kunmap(pfn_to_page(pfn));
355         else
356                 iounmap(vaddr);
357 }
358
359 void __iomem *__init_refok
360 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
361 {
362         struct acpi_ioremap *map;
363         void __iomem *virt;
364         acpi_physical_address pg_off;
365         acpi_size pg_sz;
366
367         if (phys > ULONG_MAX) {
368                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
369                 return NULL;
370         }
371
372         if (!acpi_gbl_permanent_mmap)
373                 return __acpi_map_table((unsigned long)phys, size);
374
375         mutex_lock(&acpi_ioremap_lock);
376         /* Check if there's a suitable mapping already. */
377         map = acpi_map_lookup(phys, size);
378         if (map) {
379                 map->refcount++;
380                 goto out;
381         }
382
383         map = kzalloc(sizeof(*map), GFP_KERNEL);
384         if (!map) {
385                 mutex_unlock(&acpi_ioremap_lock);
386                 return NULL;
387         }
388
389         pg_off = round_down(phys, PAGE_SIZE);
390         pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
391         virt = acpi_map(pg_off, pg_sz);
392         if (!virt) {
393                 mutex_unlock(&acpi_ioremap_lock);
394                 kfree(map);
395                 return NULL;
396         }
397
398         INIT_LIST_HEAD(&map->list);
399         map->virt = virt;
400         map->phys = pg_off;
401         map->size = pg_sz;
402         map->refcount = 1;
403
404         list_add_tail_rcu(&map->list, &acpi_ioremaps);
405
406  out:
407         mutex_unlock(&acpi_ioremap_lock);
408         return map->virt + (phys - map->phys);
409 }
410 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
411
412 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
413 {
414         if (!--map->refcount)
415                 list_del_rcu(&map->list);
416 }
417
418 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
419 {
420         if (!map->refcount) {
421                 synchronize_rcu();
422                 acpi_unmap(map->phys, map->virt);
423                 kfree(map);
424         }
425 }
426
427 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
428 {
429         struct acpi_ioremap *map;
430
431         if (!acpi_gbl_permanent_mmap) {
432                 __acpi_unmap_table(virt, size);
433                 return;
434         }
435
436         mutex_lock(&acpi_ioremap_lock);
437         map = acpi_map_lookup_virt(virt, size);
438         if (!map) {
439                 mutex_unlock(&acpi_ioremap_lock);
440                 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
441                 return;
442         }
443         acpi_os_drop_map_ref(map);
444         mutex_unlock(&acpi_ioremap_lock);
445
446         acpi_os_map_cleanup(map);
447 }
448 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
449
450 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
451 {
452         if (!acpi_gbl_permanent_mmap)
453                 __acpi_unmap_table(virt, size);
454 }
455
456 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
457 {
458         u64 addr;
459         void __iomem *virt;
460
461         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
462                 return 0;
463
464         /* Handle possible alignment issues */
465         memcpy(&addr, &gas->address, sizeof(addr));
466         if (!addr || !gas->bit_width)
467                 return -EINVAL;
468
469         virt = acpi_os_map_memory(addr, gas->bit_width / 8);
470         if (!virt)
471                 return -EIO;
472
473         return 0;
474 }
475 EXPORT_SYMBOL(acpi_os_map_generic_address);
476
477 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
478 {
479         u64 addr;
480         struct acpi_ioremap *map;
481
482         if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
483                 return;
484
485         /* Handle possible alignment issues */
486         memcpy(&addr, &gas->address, sizeof(addr));
487         if (!addr || !gas->bit_width)
488                 return;
489
490         mutex_lock(&acpi_ioremap_lock);
491         map = acpi_map_lookup(addr, gas->bit_width / 8);
492         if (!map) {
493                 mutex_unlock(&acpi_ioremap_lock);
494                 return;
495         }
496         acpi_os_drop_map_ref(map);
497         mutex_unlock(&acpi_ioremap_lock);
498
499         acpi_os_map_cleanup(map);
500 }
501 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
502
503 #ifdef ACPI_FUTURE_USAGE
504 acpi_status
505 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
506 {
507         if (!phys || !virt)
508                 return AE_BAD_PARAMETER;
509
510         *phys = virt_to_phys(virt);
511
512         return AE_OK;
513 }
514 #endif
515
516 #define ACPI_MAX_OVERRIDE_LEN 100
517
518 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
519
520 acpi_status
521 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
522                             acpi_string * new_val)
523 {
524         if (!init_val || !new_val)
525                 return AE_BAD_PARAMETER;
526
527         *new_val = NULL;
528         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
529                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
530                        acpi_os_name);
531                 *new_val = acpi_os_name;
532         }
533
534         return AE_OK;
535 }
536
537 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
538 #include <linux/earlycpio.h>
539 #include <linux/memblock.h>
540
541 static u64 acpi_tables_addr;
542 static int all_tables_size;
543
544 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
545 u8 __init acpi_table_checksum(u8 *buffer, u32 length)
546 {
547         u8 sum = 0;
548         u8 *end = buffer + length;
549
550         while (buffer < end)
551                 sum = (u8) (sum + *(buffer++));
552         return sum;
553 }
554
555 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
556 static const char * const table_sigs[] = {
557         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
558         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
559         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
560         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
561         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
562         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
563         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
564         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
565         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
566
567 /* Non-fatal errors: Affected tables/files are ignored */
568 #define INVALID_TABLE(x, path, name)                                    \
569         { pr_err("ACPI OVERRIDE: " x " [%s%s]\n", path, name); continue; }
570
571 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
572
573 /* Must not increase 10 or needs code modification below */
574 #define ACPI_OVERRIDE_TABLES 10
575
576 void __init acpi_initrd_override(void *data, size_t size)
577 {
578         int sig, no, table_nr = 0, total_offset = 0;
579         long offset = 0;
580         struct acpi_table_header *table;
581         char cpio_path[32] = "kernel/firmware/acpi/";
582         struct cpio_data file;
583         struct cpio_data early_initrd_files[ACPI_OVERRIDE_TABLES];
584         char *p;
585
586         if (data == NULL || size == 0)
587                 return;
588
589         for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
590                 file = find_cpio_data(cpio_path, data, size, &offset);
591                 if (!file.data)
592                         break;
593
594                 data += offset;
595                 size -= offset;
596
597                 if (file.size < sizeof(struct acpi_table_header))
598                         INVALID_TABLE("Table smaller than ACPI header",
599                                       cpio_path, file.name);
600
601                 table = file.data;
602
603                 for (sig = 0; table_sigs[sig]; sig++)
604                         if (!memcmp(table->signature, table_sigs[sig], 4))
605                                 break;
606
607                 if (!table_sigs[sig])
608                         INVALID_TABLE("Unknown signature",
609                                       cpio_path, file.name);
610                 if (file.size != table->length)
611                         INVALID_TABLE("File length does not match table length",
612                                       cpio_path, file.name);
613                 if (acpi_table_checksum(file.data, table->length))
614                         INVALID_TABLE("Bad table checksum",
615                                       cpio_path, file.name);
616
617                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
618                         table->signature, cpio_path, file.name, table->length);
619
620                 all_tables_size += table->length;
621                 early_initrd_files[table_nr].data = file.data;
622                 early_initrd_files[table_nr].size = file.size;
623                 table_nr++;
624         }
625         if (table_nr == 0)
626                 return;
627
628         acpi_tables_addr =
629                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
630                                        all_tables_size, PAGE_SIZE);
631         if (!acpi_tables_addr) {
632                 WARN_ON(1);
633                 return;
634         }
635         /*
636          * Only calling e820_add_reserve does not work and the
637          * tables are invalid (memory got used) later.
638          * memblock_reserve works as expected and the tables won't get modified.
639          * But it's not enough on X86 because ioremap will
640          * complain later (used by acpi_os_map_memory) that the pages
641          * that should get mapped are not marked "reserved".
642          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
643          * works fine.
644          */
645         memblock_reserve(acpi_tables_addr, acpi_tables_addr + all_tables_size);
646         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
647
648         p = early_ioremap(acpi_tables_addr, all_tables_size);
649
650         for (no = 0; no < table_nr; no++) {
651                 memcpy(p + total_offset, early_initrd_files[no].data,
652                        early_initrd_files[no].size);
653                 total_offset += early_initrd_files[no].size;
654         }
655         early_iounmap(p, all_tables_size);
656 }
657 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
658
659 static void acpi_table_taint(struct acpi_table_header *table)
660 {
661         pr_warn(PREFIX
662                 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
663                 table->signature, table->oem_table_id);
664         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
665 }
666
667
668 acpi_status
669 acpi_os_table_override(struct acpi_table_header * existing_table,
670                        struct acpi_table_header ** new_table)
671 {
672         if (!existing_table || !new_table)
673                 return AE_BAD_PARAMETER;
674
675         *new_table = NULL;
676
677 #ifdef CONFIG_ACPI_CUSTOM_DSDT
678         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
679                 *new_table = (struct acpi_table_header *)AmlCode;
680 #endif
681         if (*new_table != NULL)
682                 acpi_table_taint(existing_table);
683         return AE_OK;
684 }
685
686 acpi_status
687 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
688                                 acpi_physical_address *address,
689                                 u32 *table_length)
690 {
691 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
692         *table_length = 0;
693         *address = 0;
694         return AE_OK;
695 #else
696         int table_offset = 0;
697         struct acpi_table_header *table;
698
699         *table_length = 0;
700         *address = 0;
701
702         if (!acpi_tables_addr)
703                 return AE_OK;
704
705         do {
706                 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
707                         WARN_ON(1);
708                         return AE_OK;
709                 }
710
711                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
712                                            ACPI_HEADER_SIZE);
713
714                 if (table_offset + table->length > all_tables_size) {
715                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
716                         WARN_ON(1);
717                         return AE_OK;
718                 }
719
720                 table_offset += table->length;
721
722                 if (memcmp(existing_table->signature, table->signature, 4)) {
723                         acpi_os_unmap_memory(table,
724                                      ACPI_HEADER_SIZE);
725                         continue;
726                 }
727
728                 /* Only override tables with matching oem id */
729                 if (memcmp(table->oem_table_id, existing_table->oem_table_id,
730                            ACPI_OEM_TABLE_ID_SIZE)) {
731                         acpi_os_unmap_memory(table,
732                                      ACPI_HEADER_SIZE);
733                         continue;
734                 }
735
736                 table_offset -= table->length;
737                 *table_length = table->length;
738                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
739                 *address = acpi_tables_addr + table_offset;
740                 break;
741         } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
742
743         if (*address != 0)
744                 acpi_table_taint(existing_table);
745         return AE_OK;
746 #endif
747 }
748
749 static irqreturn_t acpi_irq(int irq, void *dev_id)
750 {
751         u32 handled;
752
753         handled = (*acpi_irq_handler) (acpi_irq_context);
754
755         if (handled) {
756                 acpi_irq_handled++;
757                 return IRQ_HANDLED;
758         } else {
759                 acpi_irq_not_handled++;
760                 return IRQ_NONE;
761         }
762 }
763
764 acpi_status
765 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
766                                   void *context)
767 {
768         unsigned int irq;
769
770         acpi_irq_stats_init();
771
772         /*
773          * ACPI interrupts different from the SCI in our copy of the FADT are
774          * not supported.
775          */
776         if (gsi != acpi_gbl_FADT.sci_interrupt)
777                 return AE_BAD_PARAMETER;
778
779         if (acpi_irq_handler)
780                 return AE_ALREADY_ACQUIRED;
781
782         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
783                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
784                        gsi);
785                 return AE_OK;
786         }
787
788         acpi_irq_handler = handler;
789         acpi_irq_context = context;
790         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
791                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
792                 acpi_irq_handler = NULL;
793                 return AE_NOT_ACQUIRED;
794         }
795
796         return AE_OK;
797 }
798
799 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
800 {
801         if (irq != acpi_gbl_FADT.sci_interrupt)
802                 return AE_BAD_PARAMETER;
803
804         free_irq(irq, acpi_irq);
805         acpi_irq_handler = NULL;
806
807         return AE_OK;
808 }
809
810 /*
811  * Running in interpreter thread context, safe to sleep
812  */
813
814 void acpi_os_sleep(u64 ms)
815 {
816         schedule_timeout_interruptible(msecs_to_jiffies(ms));
817 }
818
819 void acpi_os_stall(u32 us)
820 {
821         while (us) {
822                 u32 delay = 1000;
823
824                 if (delay > us)
825                         delay = us;
826                 udelay(delay);
827                 touch_nmi_watchdog();
828                 us -= delay;
829         }
830 }
831
832 /*
833  * Support ACPI 3.0 AML Timer operand
834  * Returns 64-bit free-running, monotonically increasing timer
835  * with 100ns granularity
836  */
837 u64 acpi_os_get_timer(void)
838 {
839         static u64 t;
840
841 #ifdef  CONFIG_HPET
842         /* TBD: use HPET if available */
843 #endif
844
845 #ifdef  CONFIG_X86_PM_TIMER
846         /* TBD: default to PM timer if HPET was not available */
847 #endif
848         if (!t)
849                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
850
851         return ++t;
852 }
853
854 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
855 {
856         u32 dummy;
857
858         if (!value)
859                 value = &dummy;
860
861         *value = 0;
862         if (width <= 8) {
863                 *(u8 *) value = inb(port);
864         } else if (width <= 16) {
865                 *(u16 *) value = inw(port);
866         } else if (width <= 32) {
867                 *(u32 *) value = inl(port);
868         } else {
869                 BUG();
870         }
871
872         return AE_OK;
873 }
874
875 EXPORT_SYMBOL(acpi_os_read_port);
876
877 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
878 {
879         if (width <= 8) {
880                 outb(value, port);
881         } else if (width <= 16) {
882                 outw(value, port);
883         } else if (width <= 32) {
884                 outl(value, port);
885         } else {
886                 BUG();
887         }
888
889         return AE_OK;
890 }
891
892 EXPORT_SYMBOL(acpi_os_write_port);
893
894 #ifdef readq
895 static inline u64 read64(const volatile void __iomem *addr)
896 {
897         return readq(addr);
898 }
899 #else
900 static inline u64 read64(const volatile void __iomem *addr)
901 {
902         u64 l, h;
903         l = readl(addr);
904         h = readl(addr+4);
905         return l | (h << 32);
906 }
907 #endif
908
909 acpi_status
910 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
911 {
912         void __iomem *virt_addr;
913         unsigned int size = width / 8;
914         bool unmap = false;
915         u64 dummy;
916
917         rcu_read_lock();
918         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
919         if (!virt_addr) {
920                 rcu_read_unlock();
921                 virt_addr = acpi_os_ioremap(phys_addr, size);
922                 if (!virt_addr)
923                         return AE_BAD_ADDRESS;
924                 unmap = true;
925         }
926
927         if (!value)
928                 value = &dummy;
929
930         switch (width) {
931         case 8:
932                 *(u8 *) value = readb(virt_addr);
933                 break;
934         case 16:
935                 *(u16 *) value = readw(virt_addr);
936                 break;
937         case 32:
938                 *(u32 *) value = readl(virt_addr);
939                 break;
940         case 64:
941                 *(u64 *) value = read64(virt_addr);
942                 break;
943         default:
944                 BUG();
945         }
946
947         if (unmap)
948                 iounmap(virt_addr);
949         else
950                 rcu_read_unlock();
951
952         return AE_OK;
953 }
954
955 #ifdef writeq
956 static inline void write64(u64 val, volatile void __iomem *addr)
957 {
958         writeq(val, addr);
959 }
960 #else
961 static inline void write64(u64 val, volatile void __iomem *addr)
962 {
963         writel(val, addr);
964         writel(val>>32, addr+4);
965 }
966 #endif
967
968 acpi_status
969 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
970 {
971         void __iomem *virt_addr;
972         unsigned int size = width / 8;
973         bool unmap = false;
974
975         rcu_read_lock();
976         virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
977         if (!virt_addr) {
978                 rcu_read_unlock();
979                 virt_addr = acpi_os_ioremap(phys_addr, size);
980                 if (!virt_addr)
981                         return AE_BAD_ADDRESS;
982                 unmap = true;
983         }
984
985         switch (width) {
986         case 8:
987                 writeb(value, virt_addr);
988                 break;
989         case 16:
990                 writew(value, virt_addr);
991                 break;
992         case 32:
993                 writel(value, virt_addr);
994                 break;
995         case 64:
996                 write64(value, virt_addr);
997                 break;
998         default:
999                 BUG();
1000         }
1001
1002         if (unmap)
1003                 iounmap(virt_addr);
1004         else
1005                 rcu_read_unlock();
1006
1007         return AE_OK;
1008 }
1009
1010 acpi_status
1011 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1012                                u64 *value, u32 width)
1013 {
1014         int result, size;
1015         u32 value32;
1016
1017         if (!value)
1018                 return AE_BAD_PARAMETER;
1019
1020         switch (width) {
1021         case 8:
1022                 size = 1;
1023                 break;
1024         case 16:
1025                 size = 2;
1026                 break;
1027         case 32:
1028                 size = 4;
1029                 break;
1030         default:
1031                 return AE_ERROR;
1032         }
1033
1034         result = raw_pci_read(pci_id->segment, pci_id->bus,
1035                                 PCI_DEVFN(pci_id->device, pci_id->function),
1036                                 reg, size, &value32);
1037         *value = value32;
1038
1039         return (result ? AE_ERROR : AE_OK);
1040 }
1041
1042 acpi_status
1043 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1044                                 u64 value, u32 width)
1045 {
1046         int result, size;
1047
1048         switch (width) {
1049         case 8:
1050                 size = 1;
1051                 break;
1052         case 16:
1053                 size = 2;
1054                 break;
1055         case 32:
1056                 size = 4;
1057                 break;
1058         default:
1059                 return AE_ERROR;
1060         }
1061
1062         result = raw_pci_write(pci_id->segment, pci_id->bus,
1063                                 PCI_DEVFN(pci_id->device, pci_id->function),
1064                                 reg, size, value);
1065
1066         return (result ? AE_ERROR : AE_OK);
1067 }
1068
1069 static void acpi_os_execute_deferred(struct work_struct *work)
1070 {
1071         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1072
1073         if (dpc->wait)
1074                 acpi_os_wait_events_complete();
1075
1076         dpc->function(dpc->context);
1077         kfree(dpc);
1078 }
1079
1080 /*******************************************************************************
1081  *
1082  * FUNCTION:    acpi_os_execute
1083  *
1084  * PARAMETERS:  Type               - Type of the callback
1085  *              Function           - Function to be executed
1086  *              Context            - Function parameters
1087  *
1088  * RETURN:      Status
1089  *
1090  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1091  *              immediately executes function on a separate thread.
1092  *
1093  ******************************************************************************/
1094
1095 static acpi_status __acpi_os_execute(acpi_execute_type type,
1096         acpi_osd_exec_callback function, void *context, int hp)
1097 {
1098         acpi_status status = AE_OK;
1099         struct acpi_os_dpc *dpc;
1100         struct workqueue_struct *queue;
1101         int ret;
1102         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1103                           "Scheduling function [%p(%p)] for deferred execution.\n",
1104                           function, context));
1105
1106         /*
1107          * Allocate/initialize DPC structure.  Note that this memory will be
1108          * freed by the callee.  The kernel handles the work_struct list  in a
1109          * way that allows us to also free its memory inside the callee.
1110          * Because we may want to schedule several tasks with different
1111          * parameters we can't use the approach some kernel code uses of
1112          * having a static work_struct.
1113          */
1114
1115         dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1116         if (!dpc)
1117                 return AE_NO_MEMORY;
1118
1119         dpc->function = function;
1120         dpc->context = context;
1121
1122         /*
1123          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
1124          * because the hotplug code may call driver .remove() functions,
1125          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
1126          * to flush these workqueues.
1127          *
1128          * To prevent lockdep from complaining unnecessarily, make sure that
1129          * there is a different static lockdep key for each workqueue by using
1130          * INIT_WORK() for each of them separately.
1131          */
1132         if (hp) {
1133                 queue = kacpi_hotplug_wq;
1134                 dpc->wait = 1;
1135                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1136         } else if (type == OSL_NOTIFY_HANDLER) {
1137                 queue = kacpi_notify_wq;
1138                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1139         } else {
1140                 queue = kacpid_wq;
1141                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1142         }
1143
1144         /*
1145          * On some machines, a software-initiated SMI causes corruption unless
1146          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1147          * typically it's done in GPE-related methods that are run via
1148          * workqueues, so we can avoid the known corruption cases by always
1149          * queueing on CPU 0.
1150          */
1151         ret = queue_work_on(0, queue, &dpc->work);
1152
1153         if (!ret) {
1154                 printk(KERN_ERR PREFIX
1155                           "Call to queue_work() failed.\n");
1156                 status = AE_ERROR;
1157                 kfree(dpc);
1158         }
1159         return status;
1160 }
1161
1162 acpi_status acpi_os_execute(acpi_execute_type type,
1163                             acpi_osd_exec_callback function, void *context)
1164 {
1165         return __acpi_os_execute(type, function, context, 0);
1166 }
1167 EXPORT_SYMBOL(acpi_os_execute);
1168
1169 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
1170         void *context)
1171 {
1172         return __acpi_os_execute(0, function, context, 1);
1173 }
1174 EXPORT_SYMBOL(acpi_os_hotplug_execute);
1175
1176 void acpi_os_wait_events_complete(void)
1177 {
1178         flush_workqueue(kacpid_wq);
1179         flush_workqueue(kacpi_notify_wq);
1180 }
1181
1182 EXPORT_SYMBOL(acpi_os_wait_events_complete);
1183
1184 acpi_status
1185 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1186 {
1187         struct semaphore *sem = NULL;
1188
1189         sem = acpi_os_allocate(sizeof(struct semaphore));
1190         if (!sem)
1191                 return AE_NO_MEMORY;
1192         memset(sem, 0, sizeof(struct semaphore));
1193
1194         sema_init(sem, initial_units);
1195
1196         *handle = (acpi_handle *) sem;
1197
1198         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1199                           *handle, initial_units));
1200
1201         return AE_OK;
1202 }
1203
1204 /*
1205  * TODO: A better way to delete semaphores?  Linux doesn't have a
1206  * 'delete_semaphore()' function -- may result in an invalid
1207  * pointer dereference for non-synchronized consumers.  Should
1208  * we at least check for blocked threads and signal/cancel them?
1209  */
1210
1211 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1212 {
1213         struct semaphore *sem = (struct semaphore *)handle;
1214
1215         if (!sem)
1216                 return AE_BAD_PARAMETER;
1217
1218         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1219
1220         BUG_ON(!list_empty(&sem->wait_list));
1221         kfree(sem);
1222         sem = NULL;
1223
1224         return AE_OK;
1225 }
1226
1227 /*
1228  * TODO: Support for units > 1?
1229  */
1230 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1231 {
1232         acpi_status status = AE_OK;
1233         struct semaphore *sem = (struct semaphore *)handle;
1234         long jiffies;
1235         int ret = 0;
1236
1237         if (!sem || (units < 1))
1238                 return AE_BAD_PARAMETER;
1239
1240         if (units > 1)
1241                 return AE_SUPPORT;
1242
1243         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1244                           handle, units, timeout));
1245
1246         if (timeout == ACPI_WAIT_FOREVER)
1247                 jiffies = MAX_SCHEDULE_TIMEOUT;
1248         else
1249                 jiffies = msecs_to_jiffies(timeout);
1250         
1251         ret = down_timeout(sem, jiffies);
1252         if (ret)
1253                 status = AE_TIME;
1254
1255         if (ACPI_FAILURE(status)) {
1256                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1257                                   "Failed to acquire semaphore[%p|%d|%d], %s",
1258                                   handle, units, timeout,
1259                                   acpi_format_exception(status)));
1260         } else {
1261                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1262                                   "Acquired semaphore[%p|%d|%d]", handle,
1263                                   units, timeout));
1264         }
1265
1266         return status;
1267 }
1268
1269 /*
1270  * TODO: Support for units > 1?
1271  */
1272 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1273 {
1274         struct semaphore *sem = (struct semaphore *)handle;
1275
1276         if (!sem || (units < 1))
1277                 return AE_BAD_PARAMETER;
1278
1279         if (units > 1)
1280                 return AE_SUPPORT;
1281
1282         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1283                           units));
1284
1285         up(sem);
1286
1287         return AE_OK;
1288 }
1289
1290 #ifdef ACPI_FUTURE_USAGE
1291 u32 acpi_os_get_line(char *buffer)
1292 {
1293
1294 #ifdef ENABLE_DEBUGGER
1295         if (acpi_in_debugger) {
1296                 u32 chars;
1297
1298                 kdb_read(buffer, sizeof(line_buf));
1299
1300                 /* remove the CR kdb includes */
1301                 chars = strlen(buffer) - 1;
1302                 buffer[chars] = '\0';
1303         }
1304 #endif
1305
1306         return 0;
1307 }
1308 #endif                          /*  ACPI_FUTURE_USAGE  */
1309
1310 acpi_status acpi_os_signal(u32 function, void *info)
1311 {
1312         switch (function) {
1313         case ACPI_SIGNAL_FATAL:
1314                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1315                 break;
1316         case ACPI_SIGNAL_BREAKPOINT:
1317                 /*
1318                  * AML Breakpoint
1319                  * ACPI spec. says to treat it as a NOP unless
1320                  * you are debugging.  So if/when we integrate
1321                  * AML debugger into the kernel debugger its
1322                  * hook will go here.  But until then it is
1323                  * not useful to print anything on breakpoints.
1324                  */
1325                 break;
1326         default:
1327                 break;
1328         }
1329
1330         return AE_OK;
1331 }
1332
1333 static int __init acpi_os_name_setup(char *str)
1334 {
1335         char *p = acpi_os_name;
1336         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1337
1338         if (!str || !*str)
1339                 return 0;
1340
1341         for (; count-- && str && *str; str++) {
1342                 if (isalnum(*str) || *str == ' ' || *str == ':')
1343                         *p++ = *str;
1344                 else if (*str == '\'' || *str == '"')
1345                         continue;
1346                 else
1347                         break;
1348         }
1349         *p = 0;
1350
1351         return 1;
1352
1353 }
1354
1355 __setup("acpi_os_name=", acpi_os_name_setup);
1356
1357 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
1358 #define OSI_STRING_ENTRIES_MAX 16       /* arbitrary */
1359
1360 struct osi_setup_entry {
1361         char string[OSI_STRING_LENGTH_MAX];
1362         bool enable;
1363 };
1364
1365 static struct osi_setup_entry __initdata
1366                 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1367         {"Module Device", true},
1368         {"Processor Device", true},
1369         {"3.0 _SCP Extensions", true},
1370         {"Processor Aggregator Device", true},
1371 };
1372
1373 void __init acpi_osi_setup(char *str)
1374 {
1375         struct osi_setup_entry *osi;
1376         bool enable = true;
1377         int i;
1378
1379         if (!acpi_gbl_create_osi_method)
1380                 return;
1381
1382         if (str == NULL || *str == '\0') {
1383                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1384                 acpi_gbl_create_osi_method = FALSE;
1385                 return;
1386         }
1387
1388         if (*str == '!') {
1389                 str++;
1390                 enable = false;
1391         }
1392
1393         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1394                 osi = &osi_setup_entries[i];
1395                 if (!strcmp(osi->string, str)) {
1396                         osi->enable = enable;
1397                         break;
1398                 } else if (osi->string[0] == '\0') {
1399                         osi->enable = enable;
1400                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1401                         break;
1402                 }
1403         }
1404 }
1405
1406 static void __init set_osi_linux(unsigned int enable)
1407 {
1408         if (osi_linux.enable != enable)
1409                 osi_linux.enable = enable;
1410
1411         if (osi_linux.enable)
1412                 acpi_osi_setup("Linux");
1413         else
1414                 acpi_osi_setup("!Linux");
1415
1416         return;
1417 }
1418
1419 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1420 {
1421         osi_linux.cmdline = 1;  /* cmdline set the default and override DMI */
1422         osi_linux.dmi = 0;
1423         set_osi_linux(enable);
1424
1425         return;
1426 }
1427
1428 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1429 {
1430         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1431
1432         if (enable == -1)
1433                 return;
1434
1435         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1436         set_osi_linux(enable);
1437
1438         return;
1439 }
1440
1441 /*
1442  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1443  *
1444  * empty string disables _OSI
1445  * string starting with '!' disables that string
1446  * otherwise string is added to list, augmenting built-in strings
1447  */
1448 static void __init acpi_osi_setup_late(void)
1449 {
1450         struct osi_setup_entry *osi;
1451         char *str;
1452         int i;
1453         acpi_status status;
1454
1455         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1456                 osi = &osi_setup_entries[i];
1457                 str = osi->string;
1458
1459                 if (*str == '\0')
1460                         break;
1461                 if (osi->enable) {
1462                         status = acpi_install_interface(str);
1463
1464                         if (ACPI_SUCCESS(status))
1465                                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1466                 } else {
1467                         status = acpi_remove_interface(str);
1468
1469                         if (ACPI_SUCCESS(status))
1470                                 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1471                 }
1472         }
1473 }
1474
1475 static int __init osi_setup(char *str)
1476 {
1477         if (str && !strcmp("Linux", str))
1478                 acpi_cmdline_osi_linux(1);
1479         else if (str && !strcmp("!Linux", str))
1480                 acpi_cmdline_osi_linux(0);
1481         else
1482                 acpi_osi_setup(str);
1483
1484         return 1;
1485 }
1486
1487 __setup("acpi_osi=", osi_setup);
1488
1489 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1490 static int __init acpi_serialize_setup(char *str)
1491 {
1492         printk(KERN_INFO PREFIX "serialize enabled\n");
1493
1494         acpi_gbl_all_methods_serialized = TRUE;
1495
1496         return 1;
1497 }
1498
1499 __setup("acpi_serialize", acpi_serialize_setup);
1500
1501 /* Check of resource interference between native drivers and ACPI
1502  * OperationRegions (SystemIO and System Memory only).
1503  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1504  * in arbitrary AML code and can interfere with legacy drivers.
1505  * acpi_enforce_resources= can be set to:
1506  *
1507  *   - strict (default) (2)
1508  *     -> further driver trying to access the resources will not load
1509  *   - lax              (1)
1510  *     -> further driver trying to access the resources will load, but you
1511  *     get a system message that something might go wrong...
1512  *
1513  *   - no               (0)
1514  *     -> ACPI Operation Region resources will not be registered
1515  *
1516  */
1517 #define ENFORCE_RESOURCES_STRICT 2
1518 #define ENFORCE_RESOURCES_LAX    1
1519 #define ENFORCE_RESOURCES_NO     0
1520
1521 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1522
1523 static int __init acpi_enforce_resources_setup(char *str)
1524 {
1525         if (str == NULL || *str == '\0')
1526                 return 0;
1527
1528         if (!strcmp("strict", str))
1529                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1530         else if (!strcmp("lax", str))
1531                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1532         else if (!strcmp("no", str))
1533                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1534
1535         return 1;
1536 }
1537
1538 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1539
1540 /* Check for resource conflicts between ACPI OperationRegions and native
1541  * drivers */
1542 int acpi_check_resource_conflict(const struct resource *res)
1543 {
1544         acpi_adr_space_type space_id;
1545         acpi_size length;
1546         u8 warn = 0;
1547         int clash = 0;
1548
1549         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1550                 return 0;
1551         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1552                 return 0;
1553
1554         if (res->flags & IORESOURCE_IO)
1555                 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1556         else
1557                 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1558
1559         length = res->end - res->start + 1;
1560         if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1561                 warn = 1;
1562         clash = acpi_check_address_range(space_id, res->start, length, warn);
1563
1564         if (clash) {
1565                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1566                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1567                                 printk(KERN_NOTICE "ACPI: This conflict may"
1568                                        " cause random problems and system"
1569                                        " instability\n");
1570                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1571                                " for this device, you should use it instead of"
1572                                " the native driver\n");
1573                 }
1574                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1575                         return -EBUSY;
1576         }
1577         return 0;
1578 }
1579 EXPORT_SYMBOL(acpi_check_resource_conflict);
1580
1581 int acpi_check_region(resource_size_t start, resource_size_t n,
1582                       const char *name)
1583 {
1584         struct resource res = {
1585                 .start = start,
1586                 .end   = start + n - 1,
1587                 .name  = name,
1588                 .flags = IORESOURCE_IO,
1589         };
1590
1591         return acpi_check_resource_conflict(&res);
1592 }
1593 EXPORT_SYMBOL(acpi_check_region);
1594
1595 /*
1596  * Let drivers know whether the resource checks are effective
1597  */
1598 int acpi_resources_are_enforced(void)
1599 {
1600         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1601 }
1602 EXPORT_SYMBOL(acpi_resources_are_enforced);
1603
1604 /*
1605  * Deallocate the memory for a spinlock.
1606  */
1607 void acpi_os_delete_lock(acpi_spinlock handle)
1608 {
1609         ACPI_FREE(handle);
1610 }
1611
1612 /*
1613  * Acquire a spinlock.
1614  *
1615  * handle is a pointer to the spinlock_t.
1616  */
1617
1618 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1619 {
1620         acpi_cpu_flags flags;
1621         spin_lock_irqsave(lockp, flags);
1622         return flags;
1623 }
1624
1625 /*
1626  * Release a spinlock. See above.
1627  */
1628
1629 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1630 {
1631         spin_unlock_irqrestore(lockp, flags);
1632 }
1633
1634 #ifndef ACPI_USE_LOCAL_CACHE
1635
1636 /*******************************************************************************
1637  *
1638  * FUNCTION:    acpi_os_create_cache
1639  *
1640  * PARAMETERS:  name      - Ascii name for the cache
1641  *              size      - Size of each cached object
1642  *              depth     - Maximum depth of the cache (in objects) <ignored>
1643  *              cache     - Where the new cache object is returned
1644  *
1645  * RETURN:      status
1646  *
1647  * DESCRIPTION: Create a cache object
1648  *
1649  ******************************************************************************/
1650
1651 acpi_status
1652 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1653 {
1654         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1655         if (*cache == NULL)
1656                 return AE_ERROR;
1657         else
1658                 return AE_OK;
1659 }
1660
1661 /*******************************************************************************
1662  *
1663  * FUNCTION:    acpi_os_purge_cache
1664  *
1665  * PARAMETERS:  Cache           - Handle to cache object
1666  *
1667  * RETURN:      Status
1668  *
1669  * DESCRIPTION: Free all objects within the requested cache.
1670  *
1671  ******************************************************************************/
1672
1673 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1674 {
1675         kmem_cache_shrink(cache);
1676         return (AE_OK);
1677 }
1678
1679 /*******************************************************************************
1680  *
1681  * FUNCTION:    acpi_os_delete_cache
1682  *
1683  * PARAMETERS:  Cache           - Handle to cache object
1684  *
1685  * RETURN:      Status
1686  *
1687  * DESCRIPTION: Free all objects within the requested cache and delete the
1688  *              cache object.
1689  *
1690  ******************************************************************************/
1691
1692 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1693 {
1694         kmem_cache_destroy(cache);
1695         return (AE_OK);
1696 }
1697
1698 /*******************************************************************************
1699  *
1700  * FUNCTION:    acpi_os_release_object
1701  *
1702  * PARAMETERS:  Cache       - Handle to cache object
1703  *              Object      - The object to be released
1704  *
1705  * RETURN:      None
1706  *
1707  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1708  *              the object is deleted.
1709  *
1710  ******************************************************************************/
1711
1712 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1713 {
1714         kmem_cache_free(cache, object);
1715         return (AE_OK);
1716 }
1717 #endif
1718
1719 acpi_status __init acpi_os_initialize(void)
1720 {
1721         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1722         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1723         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1724         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1725
1726         return AE_OK;
1727 }
1728
1729 acpi_status __init acpi_os_initialize1(void)
1730 {
1731         kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1732         kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1733         kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1734         BUG_ON(!kacpid_wq);
1735         BUG_ON(!kacpi_notify_wq);
1736         BUG_ON(!kacpi_hotplug_wq);
1737         acpi_install_interface_handler(acpi_osi_handler);
1738         acpi_osi_setup_late();
1739         return AE_OK;
1740 }
1741
1742 acpi_status acpi_os_terminate(void)
1743 {
1744         if (acpi_irq_handler) {
1745                 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1746                                                  acpi_irq_handler);
1747         }
1748
1749         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1750         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1751         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1752         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1753
1754         destroy_workqueue(kacpid_wq);
1755         destroy_workqueue(kacpi_notify_wq);
1756         destroy_workqueue(kacpi_hotplug_wq);
1757
1758         return AE_OK;
1759 }
1760
1761 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1762                                   u32 pm1b_control)
1763 {
1764         int rc = 0;
1765         if (__acpi_os_prepare_sleep)
1766                 rc = __acpi_os_prepare_sleep(sleep_state,
1767                                              pm1a_control, pm1b_control);
1768         if (rc < 0)
1769                 return AE_ERROR;
1770         else if (rc > 0)
1771                 return AE_CTRL_SKIP;
1772
1773         return AE_OK;
1774 }
1775
1776 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1777                                u32 pm1a_ctrl, u32 pm1b_ctrl))
1778 {
1779         __acpi_os_prepare_sleep = func;
1780 }