xref: /openbmc/linux/drivers/acpi/osl.c (revision 2c684d89)
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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23  *
24  */
25 
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
29 #include <linux/mm.h>
30 #include <linux/highmem.h>
31 #include <linux/pci.h>
32 #include <linux/interrupt.h>
33 #include <linux/kmod.h>
34 #include <linux/delay.h>
35 #include <linux/workqueue.h>
36 #include <linux/nmi.h>
37 #include <linux/acpi.h>
38 #include <linux/efi.h>
39 #include <linux/ioport.h>
40 #include <linux/list.h>
41 #include <linux/jiffies.h>
42 #include <linux/semaphore.h>
43 
44 #include <asm/io.h>
45 #include <asm/uaccess.h>
46 #include <linux/io-64-nonatomic-lo-hi.h>
47 
48 #include "internal.h"
49 
50 #define _COMPONENT		ACPI_OS_SERVICES
51 ACPI_MODULE_NAME("osl");
52 
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 #endif				/*ENABLE_DEBUGGER */
70 
71 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
72 				      u32 pm1b_ctrl);
73 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
74 				      u32 val_b);
75 
76 static acpi_osd_handler acpi_irq_handler;
77 static void *acpi_irq_context;
78 static struct workqueue_struct *kacpid_wq;
79 static struct workqueue_struct *kacpi_notify_wq;
80 static struct workqueue_struct *kacpi_hotplug_wq;
81 static bool acpi_os_initialized;
82 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
83 
84 /*
85  * This list of permanent mappings is for memory that may be accessed from
86  * interrupt context, where we can't do the ioremap().
87  */
88 struct acpi_ioremap {
89 	struct list_head list;
90 	void __iomem *virt;
91 	acpi_physical_address phys;
92 	acpi_size size;
93 	unsigned long refcount;
94 };
95 
96 static LIST_HEAD(acpi_ioremaps);
97 static DEFINE_MUTEX(acpi_ioremap_lock);
98 
99 static void __init acpi_osi_setup_late(void);
100 
101 /*
102  * The story of _OSI(Linux)
103  *
104  * From pre-history through Linux-2.6.22,
105  * Linux responded TRUE upon a BIOS OSI(Linux) query.
106  *
107  * Unfortunately, reference BIOS writers got wind of this
108  * and put OSI(Linux) in their example code, quickly exposing
109  * this string as ill-conceived and opening the door to
110  * an un-bounded number of BIOS incompatibilities.
111  *
112  * For example, OSI(Linux) was used on resume to re-POST a
113  * video card on one system, because Linux at that time
114  * could not do a speedy restore in its native driver.
115  * But then upon gaining quick native restore capability,
116  * Linux has no way to tell the BIOS to skip the time-consuming
117  * POST -- putting Linux at a permanent performance disadvantage.
118  * On another system, the BIOS writer used OSI(Linux)
119  * to infer native OS support for IPMI!  On other systems,
120  * OSI(Linux) simply got in the way of Linux claiming to
121  * be compatible with other operating systems, exposing
122  * BIOS issues such as skipped device initialization.
123  *
124  * So "Linux" turned out to be a really poor chose of
125  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
126  *
127  * BIOS writers should NOT query _OSI(Linux) on future systems.
128  * Linux will complain on the console when it sees it, and return FALSE.
129  * To get Linux to return TRUE for your system  will require
130  * a kernel source update to add a DMI entry,
131  * or boot with "acpi_osi=Linux"
132  */
133 
134 static struct osi_linux {
135 	unsigned int	enable:1;
136 	unsigned int	dmi:1;
137 	unsigned int	cmdline:1;
138 	unsigned int	default_disabling:1;
139 } osi_linux = {0, 0, 0, 0};
140 
141 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
142 {
143 	if (!strcmp("Linux", interface)) {
144 
145 		printk_once(KERN_NOTICE FW_BUG PREFIX
146 			"BIOS _OSI(Linux) query %s%s\n",
147 			osi_linux.enable ? "honored" : "ignored",
148 			osi_linux.cmdline ? " via cmdline" :
149 			osi_linux.dmi ? " via DMI" : "");
150 	}
151 
152 	if (!strcmp("Darwin", interface)) {
153 		/*
154 		 * Apple firmware will behave poorly if it receives positive
155 		 * answers to "Darwin" and any other OS. Respond positively
156 		 * to Darwin and then disable all other vendor strings.
157 		 */
158 		acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
159 		supported = ACPI_UINT32_MAX;
160 	}
161 
162 	return supported;
163 }
164 
165 static void __init acpi_request_region (struct acpi_generic_address *gas,
166 	unsigned int length, char *desc)
167 {
168 	u64 addr;
169 
170 	/* Handle possible alignment issues */
171 	memcpy(&addr, &gas->address, sizeof(addr));
172 	if (!addr || !length)
173 		return;
174 
175 	/* Resources are never freed */
176 	if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
177 		request_region(addr, length, desc);
178 	else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
179 		request_mem_region(addr, length, desc);
180 }
181 
182 static int __init acpi_reserve_resources(void)
183 {
184 	acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
185 		"ACPI PM1a_EVT_BLK");
186 
187 	acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
188 		"ACPI PM1b_EVT_BLK");
189 
190 	acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
191 		"ACPI PM1a_CNT_BLK");
192 
193 	acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
194 		"ACPI PM1b_CNT_BLK");
195 
196 	if (acpi_gbl_FADT.pm_timer_length == 4)
197 		acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
198 
199 	acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
200 		"ACPI PM2_CNT_BLK");
201 
202 	/* Length of GPE blocks must be a non-negative multiple of 2 */
203 
204 	if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
205 		acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
206 			       acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
207 
208 	if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
209 		acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
210 			       acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
211 
212 	return 0;
213 }
214 fs_initcall_sync(acpi_reserve_resources);
215 
216 void acpi_os_printf(const char *fmt, ...)
217 {
218 	va_list args;
219 	va_start(args, fmt);
220 	acpi_os_vprintf(fmt, args);
221 	va_end(args);
222 }
223 
224 void acpi_os_vprintf(const char *fmt, va_list args)
225 {
226 	static char buffer[512];
227 
228 	vsprintf(buffer, fmt, args);
229 
230 #ifdef ENABLE_DEBUGGER
231 	if (acpi_in_debugger) {
232 		kdb_printf("%s", buffer);
233 	} else {
234 		printk(KERN_CONT "%s", buffer);
235 	}
236 #else
237 	printk(KERN_CONT "%s", buffer);
238 #endif
239 }
240 
241 #ifdef CONFIG_KEXEC
242 static unsigned long acpi_rsdp;
243 static int __init setup_acpi_rsdp(char *arg)
244 {
245 	if (kstrtoul(arg, 16, &acpi_rsdp))
246 		return -EINVAL;
247 	return 0;
248 }
249 early_param("acpi_rsdp", setup_acpi_rsdp);
250 #endif
251 
252 acpi_physical_address __init acpi_os_get_root_pointer(void)
253 {
254 #ifdef CONFIG_KEXEC
255 	if (acpi_rsdp)
256 		return acpi_rsdp;
257 #endif
258 
259 	if (efi_enabled(EFI_CONFIG_TABLES)) {
260 		if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
261 			return efi.acpi20;
262 		else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
263 			return efi.acpi;
264 		else {
265 			printk(KERN_ERR PREFIX
266 			       "System description tables not found\n");
267 			return 0;
268 		}
269 	} else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
270 		acpi_physical_address pa = 0;
271 
272 		acpi_find_root_pointer(&pa);
273 		return pa;
274 	}
275 
276 	return 0;
277 }
278 
279 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
280 static struct acpi_ioremap *
281 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
282 {
283 	struct acpi_ioremap *map;
284 
285 	list_for_each_entry_rcu(map, &acpi_ioremaps, list)
286 		if (map->phys <= phys &&
287 		    phys + size <= map->phys + map->size)
288 			return map;
289 
290 	return NULL;
291 }
292 
293 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
294 static void __iomem *
295 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
296 {
297 	struct acpi_ioremap *map;
298 
299 	map = acpi_map_lookup(phys, size);
300 	if (map)
301 		return map->virt + (phys - map->phys);
302 
303 	return NULL;
304 }
305 
306 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
307 {
308 	struct acpi_ioremap *map;
309 	void __iomem *virt = NULL;
310 
311 	mutex_lock(&acpi_ioremap_lock);
312 	map = acpi_map_lookup(phys, size);
313 	if (map) {
314 		virt = map->virt + (phys - map->phys);
315 		map->refcount++;
316 	}
317 	mutex_unlock(&acpi_ioremap_lock);
318 	return virt;
319 }
320 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
321 
322 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
323 static struct acpi_ioremap *
324 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
325 {
326 	struct acpi_ioremap *map;
327 
328 	list_for_each_entry_rcu(map, &acpi_ioremaps, list)
329 		if (map->virt <= virt &&
330 		    virt + size <= map->virt + map->size)
331 			return map;
332 
333 	return NULL;
334 }
335 
336 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
337 /* ioremap will take care of cache attributes */
338 #define should_use_kmap(pfn)   0
339 #else
340 #define should_use_kmap(pfn)   page_is_ram(pfn)
341 #endif
342 
343 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
344 {
345 	unsigned long pfn;
346 
347 	pfn = pg_off >> PAGE_SHIFT;
348 	if (should_use_kmap(pfn)) {
349 		if (pg_sz > PAGE_SIZE)
350 			return NULL;
351 		return (void __iomem __force *)kmap(pfn_to_page(pfn));
352 	} else
353 		return acpi_os_ioremap(pg_off, pg_sz);
354 }
355 
356 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
357 {
358 	unsigned long pfn;
359 
360 	pfn = pg_off >> PAGE_SHIFT;
361 	if (should_use_kmap(pfn))
362 		kunmap(pfn_to_page(pfn));
363 	else
364 		iounmap(vaddr);
365 }
366 
367 void __iomem *__init_refok
368 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
369 {
370 	struct acpi_ioremap *map;
371 	void __iomem *virt;
372 	acpi_physical_address pg_off;
373 	acpi_size pg_sz;
374 
375 	if (phys > ULONG_MAX) {
376 		printk(KERN_ERR PREFIX "Cannot map memory that high\n");
377 		return NULL;
378 	}
379 
380 	if (!acpi_gbl_permanent_mmap)
381 		return __acpi_map_table((unsigned long)phys, size);
382 
383 	mutex_lock(&acpi_ioremap_lock);
384 	/* Check if there's a suitable mapping already. */
385 	map = acpi_map_lookup(phys, size);
386 	if (map) {
387 		map->refcount++;
388 		goto out;
389 	}
390 
391 	map = kzalloc(sizeof(*map), GFP_KERNEL);
392 	if (!map) {
393 		mutex_unlock(&acpi_ioremap_lock);
394 		return NULL;
395 	}
396 
397 	pg_off = round_down(phys, PAGE_SIZE);
398 	pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
399 	virt = acpi_map(pg_off, pg_sz);
400 	if (!virt) {
401 		mutex_unlock(&acpi_ioremap_lock);
402 		kfree(map);
403 		return NULL;
404 	}
405 
406 	INIT_LIST_HEAD(&map->list);
407 	map->virt = virt;
408 	map->phys = pg_off;
409 	map->size = pg_sz;
410 	map->refcount = 1;
411 
412 	list_add_tail_rcu(&map->list, &acpi_ioremaps);
413 
414 out:
415 	mutex_unlock(&acpi_ioremap_lock);
416 	return map->virt + (phys - map->phys);
417 }
418 EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
419 
420 void *__init_refok
421 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
422 {
423 	return (void *)acpi_os_map_iomem(phys, size);
424 }
425 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
426 
427 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
428 {
429 	if (!--map->refcount)
430 		list_del_rcu(&map->list);
431 }
432 
433 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
434 {
435 	if (!map->refcount) {
436 		synchronize_rcu_expedited();
437 		acpi_unmap(map->phys, map->virt);
438 		kfree(map);
439 	}
440 }
441 
442 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
443 {
444 	struct acpi_ioremap *map;
445 
446 	if (!acpi_gbl_permanent_mmap) {
447 		__acpi_unmap_table(virt, size);
448 		return;
449 	}
450 
451 	mutex_lock(&acpi_ioremap_lock);
452 	map = acpi_map_lookup_virt(virt, size);
453 	if (!map) {
454 		mutex_unlock(&acpi_ioremap_lock);
455 		WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
456 		return;
457 	}
458 	acpi_os_drop_map_ref(map);
459 	mutex_unlock(&acpi_ioremap_lock);
460 
461 	acpi_os_map_cleanup(map);
462 }
463 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
464 
465 void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
466 {
467 	return acpi_os_unmap_iomem((void __iomem *)virt, size);
468 }
469 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
470 
471 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
472 {
473 	if (!acpi_gbl_permanent_mmap)
474 		__acpi_unmap_table(virt, size);
475 }
476 
477 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
478 {
479 	u64 addr;
480 	void __iomem *virt;
481 
482 	if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
483 		return 0;
484 
485 	/* Handle possible alignment issues */
486 	memcpy(&addr, &gas->address, sizeof(addr));
487 	if (!addr || !gas->bit_width)
488 		return -EINVAL;
489 
490 	virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
491 	if (!virt)
492 		return -EIO;
493 
494 	return 0;
495 }
496 EXPORT_SYMBOL(acpi_os_map_generic_address);
497 
498 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
499 {
500 	u64 addr;
501 	struct acpi_ioremap *map;
502 
503 	if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
504 		return;
505 
506 	/* Handle possible alignment issues */
507 	memcpy(&addr, &gas->address, sizeof(addr));
508 	if (!addr || !gas->bit_width)
509 		return;
510 
511 	mutex_lock(&acpi_ioremap_lock);
512 	map = acpi_map_lookup(addr, gas->bit_width / 8);
513 	if (!map) {
514 		mutex_unlock(&acpi_ioremap_lock);
515 		return;
516 	}
517 	acpi_os_drop_map_ref(map);
518 	mutex_unlock(&acpi_ioremap_lock);
519 
520 	acpi_os_map_cleanup(map);
521 }
522 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
523 
524 #ifdef ACPI_FUTURE_USAGE
525 acpi_status
526 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
527 {
528 	if (!phys || !virt)
529 		return AE_BAD_PARAMETER;
530 
531 	*phys = virt_to_phys(virt);
532 
533 	return AE_OK;
534 }
535 #endif
536 
537 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
538 static bool acpi_rev_override;
539 
540 int __init acpi_rev_override_setup(char *str)
541 {
542 	acpi_rev_override = true;
543 	return 1;
544 }
545 __setup("acpi_rev_override", acpi_rev_override_setup);
546 #else
547 #define acpi_rev_override	false
548 #endif
549 
550 #define ACPI_MAX_OVERRIDE_LEN 100
551 
552 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
553 
554 acpi_status
555 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
556 			    char **new_val)
557 {
558 	if (!init_val || !new_val)
559 		return AE_BAD_PARAMETER;
560 
561 	*new_val = NULL;
562 	if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
563 		printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
564 		       acpi_os_name);
565 		*new_val = acpi_os_name;
566 	}
567 
568 	if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
569 		printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
570 		*new_val = (char *)5;
571 	}
572 
573 	return AE_OK;
574 }
575 
576 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
577 #include <linux/earlycpio.h>
578 #include <linux/memblock.h>
579 
580 static u64 acpi_tables_addr;
581 static int all_tables_size;
582 
583 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
584 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
585 {
586 	u8 sum = 0;
587 	u8 *end = buffer + length;
588 
589 	while (buffer < end)
590 		sum = (u8) (sum + *(buffer++));
591 	return sum;
592 }
593 
594 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
595 static const char * const table_sigs[] = {
596 	ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
597 	ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
598 	ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
599 	ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
600 	ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
601 	ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
602 	ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
603 	ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
604 	ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
605 
606 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
607 
608 #define ACPI_OVERRIDE_TABLES 64
609 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
610 
611 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
612 
613 void __init acpi_initrd_override(void *data, size_t size)
614 {
615 	int sig, no, table_nr = 0, total_offset = 0;
616 	long offset = 0;
617 	struct acpi_table_header *table;
618 	char cpio_path[32] = "kernel/firmware/acpi/";
619 	struct cpio_data file;
620 
621 	if (data == NULL || size == 0)
622 		return;
623 
624 	for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
625 		file = find_cpio_data(cpio_path, data, size, &offset);
626 		if (!file.data)
627 			break;
628 
629 		data += offset;
630 		size -= offset;
631 
632 		if (file.size < sizeof(struct acpi_table_header)) {
633 			pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
634 				cpio_path, file.name);
635 			continue;
636 		}
637 
638 		table = file.data;
639 
640 		for (sig = 0; table_sigs[sig]; sig++)
641 			if (!memcmp(table->signature, table_sigs[sig], 4))
642 				break;
643 
644 		if (!table_sigs[sig]) {
645 			pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
646 				cpio_path, file.name);
647 			continue;
648 		}
649 		if (file.size != table->length) {
650 			pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
651 				cpio_path, file.name);
652 			continue;
653 		}
654 		if (acpi_table_checksum(file.data, table->length)) {
655 			pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
656 				cpio_path, file.name);
657 			continue;
658 		}
659 
660 		pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
661 			table->signature, cpio_path, file.name, table->length);
662 
663 		all_tables_size += table->length;
664 		acpi_initrd_files[table_nr].data = file.data;
665 		acpi_initrd_files[table_nr].size = file.size;
666 		table_nr++;
667 	}
668 	if (table_nr == 0)
669 		return;
670 
671 	acpi_tables_addr =
672 		memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
673 				       all_tables_size, PAGE_SIZE);
674 	if (!acpi_tables_addr) {
675 		WARN_ON(1);
676 		return;
677 	}
678 	/*
679 	 * Only calling e820_add_reserve does not work and the
680 	 * tables are invalid (memory got used) later.
681 	 * memblock_reserve works as expected and the tables won't get modified.
682 	 * But it's not enough on X86 because ioremap will
683 	 * complain later (used by acpi_os_map_memory) that the pages
684 	 * that should get mapped are not marked "reserved".
685 	 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
686 	 * works fine.
687 	 */
688 	memblock_reserve(acpi_tables_addr, all_tables_size);
689 	arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
690 
691 	/*
692 	 * early_ioremap only can remap 256k one time. If we map all
693 	 * tables one time, we will hit the limit. Need to map chunks
694 	 * one by one during copying the same as that in relocate_initrd().
695 	 */
696 	for (no = 0; no < table_nr; no++) {
697 		unsigned char *src_p = acpi_initrd_files[no].data;
698 		phys_addr_t size = acpi_initrd_files[no].size;
699 		phys_addr_t dest_addr = acpi_tables_addr + total_offset;
700 		phys_addr_t slop, clen;
701 		char *dest_p;
702 
703 		total_offset += size;
704 
705 		while (size) {
706 			slop = dest_addr & ~PAGE_MASK;
707 			clen = size;
708 			if (clen > MAP_CHUNK_SIZE - slop)
709 				clen = MAP_CHUNK_SIZE - slop;
710 			dest_p = early_ioremap(dest_addr & PAGE_MASK,
711 						 clen + slop);
712 			memcpy(dest_p + slop, src_p, clen);
713 			early_iounmap(dest_p, clen + slop);
714 			src_p += clen;
715 			dest_addr += clen;
716 			size -= clen;
717 		}
718 	}
719 }
720 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
721 
722 static void acpi_table_taint(struct acpi_table_header *table)
723 {
724 	pr_warn(PREFIX
725 		"Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
726 		table->signature, table->oem_table_id);
727 	add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
728 }
729 
730 
731 acpi_status
732 acpi_os_table_override(struct acpi_table_header * existing_table,
733 		       struct acpi_table_header ** new_table)
734 {
735 	if (!existing_table || !new_table)
736 		return AE_BAD_PARAMETER;
737 
738 	*new_table = NULL;
739 
740 #ifdef CONFIG_ACPI_CUSTOM_DSDT
741 	if (strncmp(existing_table->signature, "DSDT", 4) == 0)
742 		*new_table = (struct acpi_table_header *)AmlCode;
743 #endif
744 	if (*new_table != NULL)
745 		acpi_table_taint(existing_table);
746 	return AE_OK;
747 }
748 
749 acpi_status
750 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
751 				acpi_physical_address *address,
752 				u32 *table_length)
753 {
754 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
755 	*table_length = 0;
756 	*address = 0;
757 	return AE_OK;
758 #else
759 	int table_offset = 0;
760 	struct acpi_table_header *table;
761 
762 	*table_length = 0;
763 	*address = 0;
764 
765 	if (!acpi_tables_addr)
766 		return AE_OK;
767 
768 	do {
769 		if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
770 			WARN_ON(1);
771 			return AE_OK;
772 		}
773 
774 		table = acpi_os_map_memory(acpi_tables_addr + table_offset,
775 					   ACPI_HEADER_SIZE);
776 
777 		if (table_offset + table->length > all_tables_size) {
778 			acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
779 			WARN_ON(1);
780 			return AE_OK;
781 		}
782 
783 		table_offset += table->length;
784 
785 		if (memcmp(existing_table->signature, table->signature, 4)) {
786 			acpi_os_unmap_memory(table,
787 				     ACPI_HEADER_SIZE);
788 			continue;
789 		}
790 
791 		/* Only override tables with matching oem id */
792 		if (memcmp(table->oem_table_id, existing_table->oem_table_id,
793 			   ACPI_OEM_TABLE_ID_SIZE)) {
794 			acpi_os_unmap_memory(table,
795 				     ACPI_HEADER_SIZE);
796 			continue;
797 		}
798 
799 		table_offset -= table->length;
800 		*table_length = table->length;
801 		acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
802 		*address = acpi_tables_addr + table_offset;
803 		break;
804 	} while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
805 
806 	if (*address != 0)
807 		acpi_table_taint(existing_table);
808 	return AE_OK;
809 #endif
810 }
811 
812 static irqreturn_t acpi_irq(int irq, void *dev_id)
813 {
814 	u32 handled;
815 
816 	handled = (*acpi_irq_handler) (acpi_irq_context);
817 
818 	if (handled) {
819 		acpi_irq_handled++;
820 		return IRQ_HANDLED;
821 	} else {
822 		acpi_irq_not_handled++;
823 		return IRQ_NONE;
824 	}
825 }
826 
827 acpi_status
828 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
829 				  void *context)
830 {
831 	unsigned int irq;
832 
833 	acpi_irq_stats_init();
834 
835 	/*
836 	 * ACPI interrupts different from the SCI in our copy of the FADT are
837 	 * not supported.
838 	 */
839 	if (gsi != acpi_gbl_FADT.sci_interrupt)
840 		return AE_BAD_PARAMETER;
841 
842 	if (acpi_irq_handler)
843 		return AE_ALREADY_ACQUIRED;
844 
845 	if (acpi_gsi_to_irq(gsi, &irq) < 0) {
846 		printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
847 		       gsi);
848 		return AE_OK;
849 	}
850 
851 	acpi_irq_handler = handler;
852 	acpi_irq_context = context;
853 	if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
854 		printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
855 		acpi_irq_handler = NULL;
856 		return AE_NOT_ACQUIRED;
857 	}
858 	acpi_sci_irq = irq;
859 
860 	return AE_OK;
861 }
862 
863 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
864 {
865 	if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
866 		return AE_BAD_PARAMETER;
867 
868 	free_irq(acpi_sci_irq, acpi_irq);
869 	acpi_irq_handler = NULL;
870 	acpi_sci_irq = INVALID_ACPI_IRQ;
871 
872 	return AE_OK;
873 }
874 
875 /*
876  * Running in interpreter thread context, safe to sleep
877  */
878 
879 void acpi_os_sleep(u64 ms)
880 {
881 	msleep(ms);
882 }
883 
884 void acpi_os_stall(u32 us)
885 {
886 	while (us) {
887 		u32 delay = 1000;
888 
889 		if (delay > us)
890 			delay = us;
891 		udelay(delay);
892 		touch_nmi_watchdog();
893 		us -= delay;
894 	}
895 }
896 
897 /*
898  * Support ACPI 3.0 AML Timer operand
899  * Returns 64-bit free-running, monotonically increasing timer
900  * with 100ns granularity
901  */
902 u64 acpi_os_get_timer(void)
903 {
904 	u64 time_ns = ktime_to_ns(ktime_get());
905 	do_div(time_ns, 100);
906 	return time_ns;
907 }
908 
909 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
910 {
911 	u32 dummy;
912 
913 	if (!value)
914 		value = &dummy;
915 
916 	*value = 0;
917 	if (width <= 8) {
918 		*(u8 *) value = inb(port);
919 	} else if (width <= 16) {
920 		*(u16 *) value = inw(port);
921 	} else if (width <= 32) {
922 		*(u32 *) value = inl(port);
923 	} else {
924 		BUG();
925 	}
926 
927 	return AE_OK;
928 }
929 
930 EXPORT_SYMBOL(acpi_os_read_port);
931 
932 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
933 {
934 	if (width <= 8) {
935 		outb(value, port);
936 	} else if (width <= 16) {
937 		outw(value, port);
938 	} else if (width <= 32) {
939 		outl(value, port);
940 	} else {
941 		BUG();
942 	}
943 
944 	return AE_OK;
945 }
946 
947 EXPORT_SYMBOL(acpi_os_write_port);
948 
949 acpi_status
950 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
951 {
952 	void __iomem *virt_addr;
953 	unsigned int size = width / 8;
954 	bool unmap = false;
955 	u64 dummy;
956 
957 	rcu_read_lock();
958 	virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
959 	if (!virt_addr) {
960 		rcu_read_unlock();
961 		virt_addr = acpi_os_ioremap(phys_addr, size);
962 		if (!virt_addr)
963 			return AE_BAD_ADDRESS;
964 		unmap = true;
965 	}
966 
967 	if (!value)
968 		value = &dummy;
969 
970 	switch (width) {
971 	case 8:
972 		*(u8 *) value = readb(virt_addr);
973 		break;
974 	case 16:
975 		*(u16 *) value = readw(virt_addr);
976 		break;
977 	case 32:
978 		*(u32 *) value = readl(virt_addr);
979 		break;
980 	case 64:
981 		*(u64 *) value = readq(virt_addr);
982 		break;
983 	default:
984 		BUG();
985 	}
986 
987 	if (unmap)
988 		iounmap(virt_addr);
989 	else
990 		rcu_read_unlock();
991 
992 	return AE_OK;
993 }
994 
995 acpi_status
996 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
997 {
998 	void __iomem *virt_addr;
999 	unsigned int size = width / 8;
1000 	bool unmap = false;
1001 
1002 	rcu_read_lock();
1003 	virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
1004 	if (!virt_addr) {
1005 		rcu_read_unlock();
1006 		virt_addr = acpi_os_ioremap(phys_addr, size);
1007 		if (!virt_addr)
1008 			return AE_BAD_ADDRESS;
1009 		unmap = true;
1010 	}
1011 
1012 	switch (width) {
1013 	case 8:
1014 		writeb(value, virt_addr);
1015 		break;
1016 	case 16:
1017 		writew(value, virt_addr);
1018 		break;
1019 	case 32:
1020 		writel(value, virt_addr);
1021 		break;
1022 	case 64:
1023 		writeq(value, virt_addr);
1024 		break;
1025 	default:
1026 		BUG();
1027 	}
1028 
1029 	if (unmap)
1030 		iounmap(virt_addr);
1031 	else
1032 		rcu_read_unlock();
1033 
1034 	return AE_OK;
1035 }
1036 
1037 acpi_status
1038 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1039 			       u64 *value, u32 width)
1040 {
1041 	int result, size;
1042 	u32 value32;
1043 
1044 	if (!value)
1045 		return AE_BAD_PARAMETER;
1046 
1047 	switch (width) {
1048 	case 8:
1049 		size = 1;
1050 		break;
1051 	case 16:
1052 		size = 2;
1053 		break;
1054 	case 32:
1055 		size = 4;
1056 		break;
1057 	default:
1058 		return AE_ERROR;
1059 	}
1060 
1061 	result = raw_pci_read(pci_id->segment, pci_id->bus,
1062 				PCI_DEVFN(pci_id->device, pci_id->function),
1063 				reg, size, &value32);
1064 	*value = value32;
1065 
1066 	return (result ? AE_ERROR : AE_OK);
1067 }
1068 
1069 acpi_status
1070 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
1071 				u64 value, u32 width)
1072 {
1073 	int result, size;
1074 
1075 	switch (width) {
1076 	case 8:
1077 		size = 1;
1078 		break;
1079 	case 16:
1080 		size = 2;
1081 		break;
1082 	case 32:
1083 		size = 4;
1084 		break;
1085 	default:
1086 		return AE_ERROR;
1087 	}
1088 
1089 	result = raw_pci_write(pci_id->segment, pci_id->bus,
1090 				PCI_DEVFN(pci_id->device, pci_id->function),
1091 				reg, size, value);
1092 
1093 	return (result ? AE_ERROR : AE_OK);
1094 }
1095 
1096 static void acpi_os_execute_deferred(struct work_struct *work)
1097 {
1098 	struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
1099 
1100 	dpc->function(dpc->context);
1101 	kfree(dpc);
1102 }
1103 
1104 /*******************************************************************************
1105  *
1106  * FUNCTION:    acpi_os_execute
1107  *
1108  * PARAMETERS:  Type               - Type of the callback
1109  *              Function           - Function to be executed
1110  *              Context            - Function parameters
1111  *
1112  * RETURN:      Status
1113  *
1114  * DESCRIPTION: Depending on type, either queues function for deferred execution or
1115  *              immediately executes function on a separate thread.
1116  *
1117  ******************************************************************************/
1118 
1119 acpi_status acpi_os_execute(acpi_execute_type type,
1120 			    acpi_osd_exec_callback function, void *context)
1121 {
1122 	acpi_status status = AE_OK;
1123 	struct acpi_os_dpc *dpc;
1124 	struct workqueue_struct *queue;
1125 	int ret;
1126 	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1127 			  "Scheduling function [%p(%p)] for deferred execution.\n",
1128 			  function, context));
1129 
1130 	/*
1131 	 * Allocate/initialize DPC structure.  Note that this memory will be
1132 	 * freed by the callee.  The kernel handles the work_struct list  in a
1133 	 * way that allows us to also free its memory inside the callee.
1134 	 * Because we may want to schedule several tasks with different
1135 	 * parameters we can't use the approach some kernel code uses of
1136 	 * having a static work_struct.
1137 	 */
1138 
1139 	dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
1140 	if (!dpc)
1141 		return AE_NO_MEMORY;
1142 
1143 	dpc->function = function;
1144 	dpc->context = context;
1145 
1146 	/*
1147 	 * To prevent lockdep from complaining unnecessarily, make sure that
1148 	 * there is a different static lockdep key for each workqueue by using
1149 	 * INIT_WORK() for each of them separately.
1150 	 */
1151 	if (type == OSL_NOTIFY_HANDLER) {
1152 		queue = kacpi_notify_wq;
1153 		INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1154 	} else {
1155 		queue = kacpid_wq;
1156 		INIT_WORK(&dpc->work, acpi_os_execute_deferred);
1157 	}
1158 
1159 	/*
1160 	 * On some machines, a software-initiated SMI causes corruption unless
1161 	 * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
1162 	 * typically it's done in GPE-related methods that are run via
1163 	 * workqueues, so we can avoid the known corruption cases by always
1164 	 * queueing on CPU 0.
1165 	 */
1166 	ret = queue_work_on(0, queue, &dpc->work);
1167 
1168 	if (!ret) {
1169 		printk(KERN_ERR PREFIX
1170 			  "Call to queue_work() failed.\n");
1171 		status = AE_ERROR;
1172 		kfree(dpc);
1173 	}
1174 	return status;
1175 }
1176 EXPORT_SYMBOL(acpi_os_execute);
1177 
1178 void acpi_os_wait_events_complete(void)
1179 {
1180 	/*
1181 	 * Make sure the GPE handler or the fixed event handler is not used
1182 	 * on another CPU after removal.
1183 	 */
1184 	if (acpi_sci_irq_valid())
1185 		synchronize_hardirq(acpi_sci_irq);
1186 	flush_workqueue(kacpid_wq);
1187 	flush_workqueue(kacpi_notify_wq);
1188 }
1189 
1190 struct acpi_hp_work {
1191 	struct work_struct work;
1192 	struct acpi_device *adev;
1193 	u32 src;
1194 };
1195 
1196 static void acpi_hotplug_work_fn(struct work_struct *work)
1197 {
1198 	struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
1199 
1200 	acpi_os_wait_events_complete();
1201 	acpi_device_hotplug(hpw->adev, hpw->src);
1202 	kfree(hpw);
1203 }
1204 
1205 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
1206 {
1207 	struct acpi_hp_work *hpw;
1208 
1209 	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
1210 		  "Scheduling hotplug event (%p, %u) for deferred execution.\n",
1211 		  adev, src));
1212 
1213 	hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
1214 	if (!hpw)
1215 		return AE_NO_MEMORY;
1216 
1217 	INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
1218 	hpw->adev = adev;
1219 	hpw->src = src;
1220 	/*
1221 	 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
1222 	 * the hotplug code may call driver .remove() functions, which may
1223 	 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
1224 	 * these workqueues.
1225 	 */
1226 	if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
1227 		kfree(hpw);
1228 		return AE_ERROR;
1229 	}
1230 	return AE_OK;
1231 }
1232 
1233 bool acpi_queue_hotplug_work(struct work_struct *work)
1234 {
1235 	return queue_work(kacpi_hotplug_wq, work);
1236 }
1237 
1238 acpi_status
1239 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
1240 {
1241 	struct semaphore *sem = NULL;
1242 
1243 	sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
1244 	if (!sem)
1245 		return AE_NO_MEMORY;
1246 
1247 	sema_init(sem, initial_units);
1248 
1249 	*handle = (acpi_handle *) sem;
1250 
1251 	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
1252 			  *handle, initial_units));
1253 
1254 	return AE_OK;
1255 }
1256 
1257 /*
1258  * TODO: A better way to delete semaphores?  Linux doesn't have a
1259  * 'delete_semaphore()' function -- may result in an invalid
1260  * pointer dereference for non-synchronized consumers.	Should
1261  * we at least check for blocked threads and signal/cancel them?
1262  */
1263 
1264 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
1265 {
1266 	struct semaphore *sem = (struct semaphore *)handle;
1267 
1268 	if (!sem)
1269 		return AE_BAD_PARAMETER;
1270 
1271 	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
1272 
1273 	BUG_ON(!list_empty(&sem->wait_list));
1274 	kfree(sem);
1275 	sem = NULL;
1276 
1277 	return AE_OK;
1278 }
1279 
1280 /*
1281  * TODO: Support for units > 1?
1282  */
1283 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
1284 {
1285 	acpi_status status = AE_OK;
1286 	struct semaphore *sem = (struct semaphore *)handle;
1287 	long jiffies;
1288 	int ret = 0;
1289 
1290 	if (!acpi_os_initialized)
1291 		return AE_OK;
1292 
1293 	if (!sem || (units < 1))
1294 		return AE_BAD_PARAMETER;
1295 
1296 	if (units > 1)
1297 		return AE_SUPPORT;
1298 
1299 	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
1300 			  handle, units, timeout));
1301 
1302 	if (timeout == ACPI_WAIT_FOREVER)
1303 		jiffies = MAX_SCHEDULE_TIMEOUT;
1304 	else
1305 		jiffies = msecs_to_jiffies(timeout);
1306 
1307 	ret = down_timeout(sem, jiffies);
1308 	if (ret)
1309 		status = AE_TIME;
1310 
1311 	if (ACPI_FAILURE(status)) {
1312 		ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1313 				  "Failed to acquire semaphore[%p|%d|%d], %s",
1314 				  handle, units, timeout,
1315 				  acpi_format_exception(status)));
1316 	} else {
1317 		ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
1318 				  "Acquired semaphore[%p|%d|%d]", handle,
1319 				  units, timeout));
1320 	}
1321 
1322 	return status;
1323 }
1324 
1325 /*
1326  * TODO: Support for units > 1?
1327  */
1328 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1329 {
1330 	struct semaphore *sem = (struct semaphore *)handle;
1331 
1332 	if (!acpi_os_initialized)
1333 		return AE_OK;
1334 
1335 	if (!sem || (units < 1))
1336 		return AE_BAD_PARAMETER;
1337 
1338 	if (units > 1)
1339 		return AE_SUPPORT;
1340 
1341 	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1342 			  units));
1343 
1344 	up(sem);
1345 
1346 	return AE_OK;
1347 }
1348 
1349 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
1350 {
1351 #ifdef ENABLE_DEBUGGER
1352 	if (acpi_in_debugger) {
1353 		u32 chars;
1354 
1355 		kdb_read(buffer, buffer_length);
1356 
1357 		/* remove the CR kdb includes */
1358 		chars = strlen(buffer) - 1;
1359 		buffer[chars] = '\0';
1360 	}
1361 #endif
1362 
1363 	return AE_OK;
1364 }
1365 
1366 acpi_status acpi_os_signal(u32 function, void *info)
1367 {
1368 	switch (function) {
1369 	case ACPI_SIGNAL_FATAL:
1370 		printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1371 		break;
1372 	case ACPI_SIGNAL_BREAKPOINT:
1373 		/*
1374 		 * AML Breakpoint
1375 		 * ACPI spec. says to treat it as a NOP unless
1376 		 * you are debugging.  So if/when we integrate
1377 		 * AML debugger into the kernel debugger its
1378 		 * hook will go here.  But until then it is
1379 		 * not useful to print anything on breakpoints.
1380 		 */
1381 		break;
1382 	default:
1383 		break;
1384 	}
1385 
1386 	return AE_OK;
1387 }
1388 
1389 static int __init acpi_os_name_setup(char *str)
1390 {
1391 	char *p = acpi_os_name;
1392 	int count = ACPI_MAX_OVERRIDE_LEN - 1;
1393 
1394 	if (!str || !*str)
1395 		return 0;
1396 
1397 	for (; count-- && *str; str++) {
1398 		if (isalnum(*str) || *str == ' ' || *str == ':')
1399 			*p++ = *str;
1400 		else if (*str == '\'' || *str == '"')
1401 			continue;
1402 		else
1403 			break;
1404 	}
1405 	*p = 0;
1406 
1407 	return 1;
1408 
1409 }
1410 
1411 __setup("acpi_os_name=", acpi_os_name_setup);
1412 
1413 #define	OSI_STRING_LENGTH_MAX 64	/* arbitrary */
1414 #define	OSI_STRING_ENTRIES_MAX 16	/* arbitrary */
1415 
1416 struct osi_setup_entry {
1417 	char string[OSI_STRING_LENGTH_MAX];
1418 	bool enable;
1419 };
1420 
1421 static struct osi_setup_entry
1422 		osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
1423 	{"Module Device", true},
1424 	{"Processor Device", true},
1425 	{"3.0 _SCP Extensions", true},
1426 	{"Processor Aggregator Device", true},
1427 };
1428 
1429 void __init acpi_osi_setup(char *str)
1430 {
1431 	struct osi_setup_entry *osi;
1432 	bool enable = true;
1433 	int i;
1434 
1435 	if (!acpi_gbl_create_osi_method)
1436 		return;
1437 
1438 	if (str == NULL || *str == '\0') {
1439 		printk(KERN_INFO PREFIX "_OSI method disabled\n");
1440 		acpi_gbl_create_osi_method = FALSE;
1441 		return;
1442 	}
1443 
1444 	if (*str == '!') {
1445 		str++;
1446 		if (*str == '\0') {
1447 			osi_linux.default_disabling = 1;
1448 			return;
1449 		} else if (*str == '*') {
1450 			acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
1451 			for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1452 				osi = &osi_setup_entries[i];
1453 				osi->enable = false;
1454 			}
1455 			return;
1456 		}
1457 		enable = false;
1458 	}
1459 
1460 	for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1461 		osi = &osi_setup_entries[i];
1462 		if (!strcmp(osi->string, str)) {
1463 			osi->enable = enable;
1464 			break;
1465 		} else if (osi->string[0] == '\0') {
1466 			osi->enable = enable;
1467 			strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1468 			break;
1469 		}
1470 	}
1471 }
1472 
1473 static void __init set_osi_linux(unsigned int enable)
1474 {
1475 	if (osi_linux.enable != enable)
1476 		osi_linux.enable = enable;
1477 
1478 	if (osi_linux.enable)
1479 		acpi_osi_setup("Linux");
1480 	else
1481 		acpi_osi_setup("!Linux");
1482 
1483 	return;
1484 }
1485 
1486 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1487 {
1488 	osi_linux.cmdline = 1;	/* cmdline set the default and override DMI */
1489 	osi_linux.dmi = 0;
1490 	set_osi_linux(enable);
1491 
1492 	return;
1493 }
1494 
1495 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1496 {
1497 	printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1498 
1499 	if (enable == -1)
1500 		return;
1501 
1502 	osi_linux.dmi = 1;	/* DMI knows that this box asks OSI(Linux) */
1503 	set_osi_linux(enable);
1504 
1505 	return;
1506 }
1507 
1508 /*
1509  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1510  *
1511  * empty string disables _OSI
1512  * string starting with '!' disables that string
1513  * otherwise string is added to list, augmenting built-in strings
1514  */
1515 static void __init acpi_osi_setup_late(void)
1516 {
1517 	struct osi_setup_entry *osi;
1518 	char *str;
1519 	int i;
1520 	acpi_status status;
1521 
1522 	if (osi_linux.default_disabling) {
1523 		status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
1524 
1525 		if (ACPI_SUCCESS(status))
1526 			printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
1527 	}
1528 
1529 	for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1530 		osi = &osi_setup_entries[i];
1531 		str = osi->string;
1532 
1533 		if (*str == '\0')
1534 			break;
1535 		if (osi->enable) {
1536 			status = acpi_install_interface(str);
1537 
1538 			if (ACPI_SUCCESS(status))
1539 				printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1540 		} else {
1541 			status = acpi_remove_interface(str);
1542 
1543 			if (ACPI_SUCCESS(status))
1544 				printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1545 		}
1546 	}
1547 }
1548 
1549 static int __init osi_setup(char *str)
1550 {
1551 	if (str && !strcmp("Linux", str))
1552 		acpi_cmdline_osi_linux(1);
1553 	else if (str && !strcmp("!Linux", str))
1554 		acpi_cmdline_osi_linux(0);
1555 	else
1556 		acpi_osi_setup(str);
1557 
1558 	return 1;
1559 }
1560 
1561 __setup("acpi_osi=", osi_setup);
1562 
1563 /*
1564  * Disable the auto-serialization of named objects creation methods.
1565  *
1566  * This feature is enabled by default.  It marks the AML control methods
1567  * that contain the opcodes to create named objects as "Serialized".
1568  */
1569 static int __init acpi_no_auto_serialize_setup(char *str)
1570 {
1571 	acpi_gbl_auto_serialize_methods = FALSE;
1572 	pr_info("ACPI: auto-serialization disabled\n");
1573 
1574 	return 1;
1575 }
1576 
1577 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
1578 
1579 /* Check of resource interference between native drivers and ACPI
1580  * OperationRegions (SystemIO and System Memory only).
1581  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1582  * in arbitrary AML code and can interfere with legacy drivers.
1583  * acpi_enforce_resources= can be set to:
1584  *
1585  *   - strict (default) (2)
1586  *     -> further driver trying to access the resources will not load
1587  *   - lax              (1)
1588  *     -> further driver trying to access the resources will load, but you
1589  *     get a system message that something might go wrong...
1590  *
1591  *   - no               (0)
1592  *     -> ACPI Operation Region resources will not be registered
1593  *
1594  */
1595 #define ENFORCE_RESOURCES_STRICT 2
1596 #define ENFORCE_RESOURCES_LAX    1
1597 #define ENFORCE_RESOURCES_NO     0
1598 
1599 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1600 
1601 static int __init acpi_enforce_resources_setup(char *str)
1602 {
1603 	if (str == NULL || *str == '\0')
1604 		return 0;
1605 
1606 	if (!strcmp("strict", str))
1607 		acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1608 	else if (!strcmp("lax", str))
1609 		acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1610 	else if (!strcmp("no", str))
1611 		acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1612 
1613 	return 1;
1614 }
1615 
1616 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1617 
1618 /* Check for resource conflicts between ACPI OperationRegions and native
1619  * drivers */
1620 int acpi_check_resource_conflict(const struct resource *res)
1621 {
1622 	acpi_adr_space_type space_id;
1623 	acpi_size length;
1624 	u8 warn = 0;
1625 	int clash = 0;
1626 
1627 	if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1628 		return 0;
1629 	if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1630 		return 0;
1631 
1632 	if (res->flags & IORESOURCE_IO)
1633 		space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1634 	else
1635 		space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1636 
1637 	length = resource_size(res);
1638 	if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1639 		warn = 1;
1640 	clash = acpi_check_address_range(space_id, res->start, length, warn);
1641 
1642 	if (clash) {
1643 		if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1644 			if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1645 				printk(KERN_NOTICE "ACPI: This conflict may"
1646 				       " cause random problems and system"
1647 				       " instability\n");
1648 			printk(KERN_INFO "ACPI: If an ACPI driver is available"
1649 			       " for this device, you should use it instead of"
1650 			       " the native driver\n");
1651 		}
1652 		if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1653 			return -EBUSY;
1654 	}
1655 	return 0;
1656 }
1657 EXPORT_SYMBOL(acpi_check_resource_conflict);
1658 
1659 int acpi_check_region(resource_size_t start, resource_size_t n,
1660 		      const char *name)
1661 {
1662 	struct resource res = {
1663 		.start = start,
1664 		.end   = start + n - 1,
1665 		.name  = name,
1666 		.flags = IORESOURCE_IO,
1667 	};
1668 
1669 	return acpi_check_resource_conflict(&res);
1670 }
1671 EXPORT_SYMBOL(acpi_check_region);
1672 
1673 /*
1674  * Let drivers know whether the resource checks are effective
1675  */
1676 int acpi_resources_are_enforced(void)
1677 {
1678 	return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1679 }
1680 EXPORT_SYMBOL(acpi_resources_are_enforced);
1681 
1682 bool acpi_osi_is_win8(void)
1683 {
1684 	return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
1685 }
1686 EXPORT_SYMBOL(acpi_osi_is_win8);
1687 
1688 /*
1689  * Deallocate the memory for a spinlock.
1690  */
1691 void acpi_os_delete_lock(acpi_spinlock handle)
1692 {
1693 	ACPI_FREE(handle);
1694 }
1695 
1696 /*
1697  * Acquire a spinlock.
1698  *
1699  * handle is a pointer to the spinlock_t.
1700  */
1701 
1702 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1703 {
1704 	acpi_cpu_flags flags;
1705 	spin_lock_irqsave(lockp, flags);
1706 	return flags;
1707 }
1708 
1709 /*
1710  * Release a spinlock. See above.
1711  */
1712 
1713 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1714 {
1715 	spin_unlock_irqrestore(lockp, flags);
1716 }
1717 
1718 #ifndef ACPI_USE_LOCAL_CACHE
1719 
1720 /*******************************************************************************
1721  *
1722  * FUNCTION:    acpi_os_create_cache
1723  *
1724  * PARAMETERS:  name      - Ascii name for the cache
1725  *              size      - Size of each cached object
1726  *              depth     - Maximum depth of the cache (in objects) <ignored>
1727  *              cache     - Where the new cache object is returned
1728  *
1729  * RETURN:      status
1730  *
1731  * DESCRIPTION: Create a cache object
1732  *
1733  ******************************************************************************/
1734 
1735 acpi_status
1736 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1737 {
1738 	*cache = kmem_cache_create(name, size, 0, 0, NULL);
1739 	if (*cache == NULL)
1740 		return AE_ERROR;
1741 	else
1742 		return AE_OK;
1743 }
1744 
1745 /*******************************************************************************
1746  *
1747  * FUNCTION:    acpi_os_purge_cache
1748  *
1749  * PARAMETERS:  Cache           - Handle to cache object
1750  *
1751  * RETURN:      Status
1752  *
1753  * DESCRIPTION: Free all objects within the requested cache.
1754  *
1755  ******************************************************************************/
1756 
1757 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1758 {
1759 	kmem_cache_shrink(cache);
1760 	return (AE_OK);
1761 }
1762 
1763 /*******************************************************************************
1764  *
1765  * FUNCTION:    acpi_os_delete_cache
1766  *
1767  * PARAMETERS:  Cache           - Handle to cache object
1768  *
1769  * RETURN:      Status
1770  *
1771  * DESCRIPTION: Free all objects within the requested cache and delete the
1772  *              cache object.
1773  *
1774  ******************************************************************************/
1775 
1776 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1777 {
1778 	kmem_cache_destroy(cache);
1779 	return (AE_OK);
1780 }
1781 
1782 /*******************************************************************************
1783  *
1784  * FUNCTION:    acpi_os_release_object
1785  *
1786  * PARAMETERS:  Cache       - Handle to cache object
1787  *              Object      - The object to be released
1788  *
1789  * RETURN:      None
1790  *
1791  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1792  *              the object is deleted.
1793  *
1794  ******************************************************************************/
1795 
1796 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1797 {
1798 	kmem_cache_free(cache, object);
1799 	return (AE_OK);
1800 }
1801 #endif
1802 
1803 static int __init acpi_no_static_ssdt_setup(char *s)
1804 {
1805 	acpi_gbl_disable_ssdt_table_install = TRUE;
1806 	pr_info("ACPI: static SSDT installation disabled\n");
1807 
1808 	return 0;
1809 }
1810 
1811 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
1812 
1813 static int __init acpi_disable_return_repair(char *s)
1814 {
1815 	printk(KERN_NOTICE PREFIX
1816 	       "ACPI: Predefined validation mechanism disabled\n");
1817 	acpi_gbl_disable_auto_repair = TRUE;
1818 
1819 	return 1;
1820 }
1821 
1822 __setup("acpica_no_return_repair", acpi_disable_return_repair);
1823 
1824 acpi_status __init acpi_os_initialize(void)
1825 {
1826 	acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1827 	acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1828 	acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1829 	acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1830 	if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
1831 		/*
1832 		 * Use acpi_os_map_generic_address to pre-map the reset
1833 		 * register if it's in system memory.
1834 		 */
1835 		int rv;
1836 
1837 		rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
1838 		pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
1839 	}
1840 	acpi_os_initialized = true;
1841 
1842 	return AE_OK;
1843 }
1844 
1845 acpi_status __init acpi_os_initialize1(void)
1846 {
1847 	kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1848 	kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1849 	kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
1850 	BUG_ON(!kacpid_wq);
1851 	BUG_ON(!kacpi_notify_wq);
1852 	BUG_ON(!kacpi_hotplug_wq);
1853 	acpi_install_interface_handler(acpi_osi_handler);
1854 	acpi_osi_setup_late();
1855 	return AE_OK;
1856 }
1857 
1858 acpi_status acpi_os_terminate(void)
1859 {
1860 	if (acpi_irq_handler) {
1861 		acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1862 						 acpi_irq_handler);
1863 	}
1864 
1865 	acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1866 	acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1867 	acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1868 	acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1869 	if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
1870 		acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
1871 
1872 	destroy_workqueue(kacpid_wq);
1873 	destroy_workqueue(kacpi_notify_wq);
1874 	destroy_workqueue(kacpi_hotplug_wq);
1875 
1876 	return AE_OK;
1877 }
1878 
1879 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
1880 				  u32 pm1b_control)
1881 {
1882 	int rc = 0;
1883 	if (__acpi_os_prepare_sleep)
1884 		rc = __acpi_os_prepare_sleep(sleep_state,
1885 					     pm1a_control, pm1b_control);
1886 	if (rc < 0)
1887 		return AE_ERROR;
1888 	else if (rc > 0)
1889 		return AE_CTRL_SKIP;
1890 
1891 	return AE_OK;
1892 }
1893 
1894 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
1895 			       u32 pm1a_ctrl, u32 pm1b_ctrl))
1896 {
1897 	__acpi_os_prepare_sleep = func;
1898 }
1899 
1900 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
1901 				  u32 val_b)
1902 {
1903 	int rc = 0;
1904 	if (__acpi_os_prepare_extended_sleep)
1905 		rc = __acpi_os_prepare_extended_sleep(sleep_state,
1906 					     val_a, val_b);
1907 	if (rc < 0)
1908 		return AE_ERROR;
1909 	else if (rc > 0)
1910 		return AE_CTRL_SKIP;
1911 
1912 	return AE_OK;
1913 }
1914 
1915 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
1916 			       u32 val_a, u32 val_b))
1917 {
1918 	__acpi_os_prepare_extended_sleep = func;
1919 }
1920