1 #ifndef _LINUX_EFI_H
2 #define _LINUX_EFI_H
3
4 /*
5 * Extensible Firmware Interface
6 * Based on 'Extensible Firmware Interface Specification' version 0.9, April 30, 1999
7 *
8 * Copyright (C) 1999 VA Linux Systems
9 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
10 * Copyright (C) 1999, 2002-2003 Hewlett-Packard Co.
11 * David Mosberger-Tang <davidm@hpl.hp.com>
12 * Stephane Eranian <eranian@hpl.hp.com>
13 */
14 #include <linux/init.h>
15 #include <linux/string.h>
16 #include <linux/time.h>
17 #include <linux/types.h>
18 #include <linux/proc_fs.h>
19 #include <linux/rtc.h>
20 #include <linux/ioport.h>
21 #include <linux/pfn.h>
22 #include <linux/pstore.h>
23
24 #include <asm/page.h>
25 #include <asm/system.h>
26
27 #define EFI_SUCCESS 0
28 #define EFI_LOAD_ERROR ( 1 | (1UL << (BITS_PER_LONG-1)))
29 #define EFI_INVALID_PARAMETER ( 2 | (1UL << (BITS_PER_LONG-1)))
30 #define EFI_UNSUPPORTED ( 3 | (1UL << (BITS_PER_LONG-1)))
31 #define EFI_BAD_BUFFER_SIZE ( 4 | (1UL << (BITS_PER_LONG-1)))
32 #define EFI_BUFFER_TOO_SMALL ( 5 | (1UL << (BITS_PER_LONG-1)))
33 #define EFI_NOT_FOUND (14 | (1UL << (BITS_PER_LONG-1)))
34
35 typedef unsigned long efi_status_t;
36 typedef u8 efi_bool_t;
37 typedef u16 efi_char16_t; /* UNICODE character */
38
39
40 typedef struct {
41 u8 b[16];
42 } efi_guid_t;
43
44 #define EFI_GUID(a,b,c,d0,d1,d2,d3,d4,d5,d6,d7) \
45 ((efi_guid_t) \
46 {{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
47 (b) & 0xff, ((b) >> 8) & 0xff, \
48 (c) & 0xff, ((c) >> 8) & 0xff, \
49 (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
50
51 /*
52 * Generic EFI table header
53 */
54 typedef struct {
55 u64 signature;
56 u32 revision;
57 u32 headersize;
58 u32 crc32;
59 u32 reserved;
60 } efi_table_hdr_t;
61
62 /*
63 * Memory map descriptor:
64 */
65
66 /* Memory types: */
67 #define EFI_RESERVED_TYPE 0
68 #define EFI_LOADER_CODE 1
69 #define EFI_LOADER_DATA 2
70 #define EFI_BOOT_SERVICES_CODE 3
71 #define EFI_BOOT_SERVICES_DATA 4
72 #define EFI_RUNTIME_SERVICES_CODE 5
73 #define EFI_RUNTIME_SERVICES_DATA 6
74 #define EFI_CONVENTIONAL_MEMORY 7
75 #define EFI_UNUSABLE_MEMORY 8
76 #define EFI_ACPI_RECLAIM_MEMORY 9
77 #define EFI_ACPI_MEMORY_NVS 10
78 #define EFI_MEMORY_MAPPED_IO 11
79 #define EFI_MEMORY_MAPPED_IO_PORT_SPACE 12
80 #define EFI_PAL_CODE 13
81 #define EFI_MAX_MEMORY_TYPE 14
82
83 /* Attribute values: */
84 #define EFI_MEMORY_UC ((u64)0x0000000000000001ULL) /* uncached */
85 #define EFI_MEMORY_WC ((u64)0x0000000000000002ULL) /* write-coalescing */
86 #define EFI_MEMORY_WT ((u64)0x0000000000000004ULL) /* write-through */
87 #define EFI_MEMORY_WB ((u64)0x0000000000000008ULL) /* write-back */
88 #define EFI_MEMORY_WP ((u64)0x0000000000001000ULL) /* write-protect */
89 #define EFI_MEMORY_RP ((u64)0x0000000000002000ULL) /* read-protect */
90 #define EFI_MEMORY_XP ((u64)0x0000000000004000ULL) /* execute-protect */
91 #define EFI_MEMORY_RUNTIME ((u64)0x8000000000000000ULL) /* range requires runtime mapping */
92 #define EFI_MEMORY_DESCRIPTOR_VERSION 1
93
94 #define EFI_PAGE_SHIFT 12
95
96 typedef struct {
97 u32 type;
98 u32 pad;
99 u64 phys_addr;
100 u64 virt_addr;
101 u64 num_pages;
102 u64 attribute;
103 } efi_memory_desc_t;
104
105 typedef struct {
106 efi_guid_t guid;
107 u32 headersize;
108 u32 flags;
109 u32 imagesize;
110 } efi_capsule_header_t;
111
112 /*
113 * Allocation types for calls to boottime->allocate_pages.
114 */
115 #define EFI_ALLOCATE_ANY_PAGES 0
116 #define EFI_ALLOCATE_MAX_ADDRESS 1
117 #define EFI_ALLOCATE_ADDRESS 2
118 #define EFI_MAX_ALLOCATE_TYPE 3
119
120 typedef int (*efi_freemem_callback_t) (u64 start, u64 end, void *arg);
121
122 /*
123 * Types and defines for Time Services
124 */
125 #define EFI_TIME_ADJUST_DAYLIGHT 0x1
126 #define EFI_TIME_IN_DAYLIGHT 0x2
127 #define EFI_UNSPECIFIED_TIMEZONE 0x07ff
128
129 typedef struct {
130 u16 year;
131 u8 month;
132 u8 day;
133 u8 hour;
134 u8 minute;
135 u8 second;
136 u8 pad1;
137 u32 nanosecond;
138 s16 timezone;
139 u8 daylight;
140 u8 pad2;
141 } efi_time_t;
142
143 typedef struct {
144 u32 resolution;
145 u32 accuracy;
146 u8 sets_to_zero;
147 } efi_time_cap_t;
148
149 /*
150 * EFI Boot Services table
151 */
152 typedef struct {
153 efi_table_hdr_t hdr;
154 void *raise_tpl;
155 void *restore_tpl;
156 void *allocate_pages;
157 void *free_pages;
158 void *get_memory_map;
159 void *allocate_pool;
160 void *free_pool;
161 void *create_event;
162 void *set_timer;
163 void *wait_for_event;
164 void *signal_event;
165 void *close_event;
166 void *check_event;
167 void *install_protocol_interface;
168 void *reinstall_protocol_interface;
169 void *uninstall_protocol_interface;
170 void *handle_protocol;
171 void *__reserved;
172 void *register_protocol_notify;
173 void *locate_handle;
174 void *locate_device_path;
175 void *install_configuration_table;
176 void *load_image;
177 void *start_image;
178 void *exit;
179 void *unload_image;
180 void *exit_boot_services;
181 void *get_next_monotonic_count;
182 void *stall;
183 void *set_watchdog_timer;
184 void *connect_controller;
185 void *disconnect_controller;
186 void *open_protocol;
187 void *close_protocol;
188 void *open_protocol_information;
189 void *protocols_per_handle;
190 void *locate_handle_buffer;
191 void *locate_protocol;
192 void *install_multiple_protocol_interfaces;
193 void *uninstall_multiple_protocol_interfaces;
194 void *calculate_crc32;
195 void *copy_mem;
196 void *set_mem;
197 void *create_event_ex;
198 } efi_boot_services_t;
199
200 /*
201 * Types and defines for EFI ResetSystem
202 */
203 #define EFI_RESET_COLD 0
204 #define EFI_RESET_WARM 1
205 #define EFI_RESET_SHUTDOWN 2
206
207 /*
208 * EFI Runtime Services table
209 */
210 #define EFI_RUNTIME_SERVICES_SIGNATURE ((u64)0x5652453544e5552ULL)
211 #define EFI_RUNTIME_SERVICES_REVISION 0x00010000
212
213 typedef struct {
214 efi_table_hdr_t hdr;
215 unsigned long get_time;
216 unsigned long set_time;
217 unsigned long get_wakeup_time;
218 unsigned long set_wakeup_time;
219 unsigned long set_virtual_address_map;
220 unsigned long convert_pointer;
221 unsigned long get_variable;
222 unsigned long get_next_variable;
223 unsigned long set_variable;
224 unsigned long get_next_high_mono_count;
225 unsigned long reset_system;
226 unsigned long update_capsule;
227 unsigned long query_capsule_caps;
228 unsigned long query_variable_info;
229 } efi_runtime_services_t;
230
231 typedef efi_status_t efi_get_time_t (efi_time_t *tm, efi_time_cap_t *tc);
232 typedef efi_status_t efi_set_time_t (efi_time_t *tm);
233 typedef efi_status_t efi_get_wakeup_time_t (efi_bool_t *enabled, efi_bool_t *pending,
234 efi_time_t *tm);
235 typedef efi_status_t efi_set_wakeup_time_t (efi_bool_t enabled, efi_time_t *tm);
236 typedef efi_status_t efi_get_variable_t (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,
237 unsigned long *data_size, void *data);
238 typedef efi_status_t efi_get_next_variable_t (unsigned long *name_size, efi_char16_t *name,
239 efi_guid_t *vendor);
240 typedef efi_status_t efi_set_variable_t (efi_char16_t *name, efi_guid_t *vendor,
241 u32 attr, unsigned long data_size,
242 void *data);
243 typedef efi_status_t efi_get_next_high_mono_count_t (u32 *count);
244 typedef void efi_reset_system_t (int reset_type, efi_status_t status,
245 unsigned long data_size, efi_char16_t *data);
246 typedef efi_status_t efi_set_virtual_address_map_t (unsigned long memory_map_size,
247 unsigned long descriptor_size,
248 u32 descriptor_version,
249 efi_memory_desc_t *virtual_map);
250 typedef efi_status_t efi_query_variable_info_t(u32 attr,
251 u64 *storage_space,
252 u64 *remaining_space,
253 u64 *max_variable_size);
254 typedef efi_status_t efi_update_capsule_t(efi_capsule_header_t **capsules,
255 unsigned long count,
256 unsigned long sg_list);
257 typedef efi_status_t efi_query_capsule_caps_t(efi_capsule_header_t **capsules,
258 unsigned long count,
259 u64 *max_size,
260 int *reset_type);
261
262 /*
263 * EFI Configuration Table and GUID definitions
264 */
265 #define NULL_GUID \
266 EFI_GUID( 0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 )
267
268 #define MPS_TABLE_GUID \
269 EFI_GUID( 0xeb9d2d2f, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
270
271 #define ACPI_TABLE_GUID \
272 EFI_GUID( 0xeb9d2d30, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
273
274 #define ACPI_20_TABLE_GUID \
275 EFI_GUID( 0x8868e871, 0xe4f1, 0x11d3, 0xbc, 0x22, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81 )
276
277 #define SMBIOS_TABLE_GUID \
278 EFI_GUID( 0xeb9d2d31, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
279
280 #define SAL_SYSTEM_TABLE_GUID \
281 EFI_GUID( 0xeb9d2d32, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
282
283 #define HCDP_TABLE_GUID \
284 EFI_GUID( 0xf951938d, 0x620b, 0x42ef, 0x82, 0x79, 0xa8, 0x4b, 0x79, 0x61, 0x78, 0x98 )
285
286 #define UGA_IO_PROTOCOL_GUID \
287 EFI_GUID( 0x61a4d49e, 0x6f68, 0x4f1b, 0xb9, 0x22, 0xa8, 0x6e, 0xed, 0xb, 0x7, 0xa2 )
288
289 #define EFI_GLOBAL_VARIABLE_GUID \
290 EFI_GUID( 0x8be4df61, 0x93ca, 0x11d2, 0xaa, 0x0d, 0x00, 0xe0, 0x98, 0x03, 0x2b, 0x8c )
291
292 #define UV_SYSTEM_TABLE_GUID \
293 EFI_GUID( 0x3b13a7d4, 0x633e, 0x11dd, 0x93, 0xec, 0xda, 0x25, 0x56, 0xd8, 0x95, 0x93 )
294
295 #define LINUX_EFI_CRASH_GUID \
296 EFI_GUID( 0xcfc8fc79, 0xbe2e, 0x4ddc, 0x97, 0xf0, 0x9f, 0x98, 0xbf, 0xe2, 0x98, 0xa0 )
297
298 #define LOADED_IMAGE_PROTOCOL_GUID \
299 EFI_GUID( 0x5b1b31a1, 0x9562, 0x11d2, 0x8e, 0x3f, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b )
300
301 #define EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID \
302 EFI_GUID( 0x9042a9de, 0x23dc, 0x4a38, 0x96, 0xfb, 0x7a, 0xde, 0xd0, 0x80, 0x51, 0x6a )
303
304 #define EFI_UGA_PROTOCOL_GUID \
305 EFI_GUID( 0x982c298b, 0xf4fa, 0x41cb, 0xb8, 0x38, 0x77, 0xaa, 0x68, 0x8f, 0xb8, 0x39 )
306
307 #define EFI_PCI_IO_PROTOCOL_GUID \
308 EFI_GUID( 0x4cf5b200, 0x68b8, 0x4ca5, 0x9e, 0xec, 0xb2, 0x3e, 0x3f, 0x50, 0x2, 0x9a )
309
310 #define EFI_FILE_INFO_ID \
311 EFI_GUID( 0x9576e92, 0x6d3f, 0x11d2, 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b )
312
313 #define EFI_FILE_SYSTEM_GUID \
314 EFI_GUID( 0x964e5b22, 0x6459, 0x11d2, 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b )
315
316 typedef struct {
317 efi_guid_t guid;
318 unsigned long table;
319 } efi_config_table_t;
320
321 #define EFI_SYSTEM_TABLE_SIGNATURE ((u64)0x5453595320494249ULL)
322
323 #define EFI_2_30_SYSTEM_TABLE_REVISION ((2 << 16) | (30))
324 #define EFI_2_20_SYSTEM_TABLE_REVISION ((2 << 16) | (20))
325 #define EFI_2_10_SYSTEM_TABLE_REVISION ((2 << 16) | (10))
326 #define EFI_2_00_SYSTEM_TABLE_REVISION ((2 << 16) | (00))
327 #define EFI_1_10_SYSTEM_TABLE_REVISION ((1 << 16) | (10))
328 #define EFI_1_02_SYSTEM_TABLE_REVISION ((1 << 16) | (02))
329
330 typedef struct {
331 efi_table_hdr_t hdr;
332 unsigned long fw_vendor; /* physical addr of CHAR16 vendor string */
333 u32 fw_revision;
334 unsigned long con_in_handle;
335 unsigned long con_in;
336 unsigned long con_out_handle;
337 unsigned long con_out;
338 unsigned long stderr_handle;
339 unsigned long stderr;
340 efi_runtime_services_t *runtime;
341 efi_boot_services_t *boottime;
342 unsigned long nr_tables;
343 unsigned long tables;
344 } efi_system_table_t;
345
346 struct efi_memory_map {
347 void *phys_map;
348 void *map;
349 void *map_end;
350 int nr_map;
351 unsigned long desc_version;
352 unsigned long desc_size;
353 };
354
355 typedef struct {
356 u32 revision;
357 void *parent_handle;
358 efi_system_table_t *system_table;
359 void *device_handle;
360 void *file_path;
361 void *reserved;
362 u32 load_options_size;
363 void *load_options;
364 void *image_base;
365 __aligned_u64 image_size;
366 unsigned int image_code_type;
367 unsigned int image_data_type;
368 unsigned long unload;
369 } efi_loaded_image_t;
370
371 typedef struct {
372 u64 revision;
373 void *open_volume;
374 } efi_file_io_interface_t;
375
376 typedef struct {
377 u64 size;
378 u64 file_size;
379 u64 phys_size;
380 efi_time_t create_time;
381 efi_time_t last_access_time;
382 efi_time_t modification_time;
383 __aligned_u64 attribute;
384 efi_char16_t filename[1];
385 } efi_file_info_t;
386
387 typedef struct {
388 u64 revision;
389 void *open;
390 void *close;
391 void *delete;
392 void *read;
393 void *write;
394 void *get_position;
395 void *set_position;
396 void *get_info;
397 void *set_info;
398 void *flush;
399 } efi_file_handle_t;
400
401 #define EFI_FILE_MODE_READ 0x0000000000000001
402 #define EFI_FILE_MODE_WRITE 0x0000000000000002
403 #define EFI_FILE_MODE_CREATE 0x8000000000000000
404
405 #define EFI_INVALID_TABLE_ADDR (~0UL)
406
407 /*
408 * All runtime access to EFI goes through this structure:
409 */
410 extern struct efi {
411 efi_system_table_t *systab; /* EFI system table */
412 unsigned int runtime_version; /* Runtime services version */
413 unsigned long mps; /* MPS table */
414 unsigned long acpi; /* ACPI table (IA64 ext 0.71) */
415 unsigned long acpi20; /* ACPI table (ACPI 2.0) */
416 unsigned long smbios; /* SM BIOS table */
417 unsigned long sal_systab; /* SAL system table */
418 unsigned long boot_info; /* boot info table */
419 unsigned long hcdp; /* HCDP table */
420 unsigned long uga; /* UGA table */
421 unsigned long uv_systab; /* UV system table */
422 efi_get_time_t *get_time;
423 efi_set_time_t *set_time;
424 efi_get_wakeup_time_t *get_wakeup_time;
425 efi_set_wakeup_time_t *set_wakeup_time;
426 efi_get_variable_t *get_variable;
427 efi_get_next_variable_t *get_next_variable;
428 efi_set_variable_t *set_variable;
429 efi_query_variable_info_t *query_variable_info;
430 efi_update_capsule_t *update_capsule;
431 efi_query_capsule_caps_t *query_capsule_caps;
432 efi_get_next_high_mono_count_t *get_next_high_mono_count;
433 efi_reset_system_t *reset_system;
434 efi_set_virtual_address_map_t *set_virtual_address_map;
435 } efi;
436
437 static inline int
efi_guidcmp(efi_guid_t left,efi_guid_t right)438 efi_guidcmp (efi_guid_t left, efi_guid_t right)
439 {
440 return memcmp(&left, &right, sizeof (efi_guid_t));
441 }
442
443 static inline char *
efi_guid_unparse(efi_guid_t * guid,char * out)444 efi_guid_unparse(efi_guid_t *guid, char *out)
445 {
446 sprintf(out, "%pUl", guid->b);
447 return out;
448 }
449
450 extern void efi_init (void);
451 extern void *efi_get_pal_addr (void);
452 extern void efi_map_pal_code (void);
453 extern void efi_memmap_walk (efi_freemem_callback_t callback, void *arg);
454 extern void efi_gettimeofday (struct timespec *ts);
455 extern void efi_enter_virtual_mode (void); /* switch EFI to virtual mode, if possible */
456 extern u64 efi_get_iobase (void);
457 extern u32 efi_mem_type (unsigned long phys_addr);
458 extern u64 efi_mem_attributes (unsigned long phys_addr);
459 extern u64 efi_mem_attribute (unsigned long phys_addr, unsigned long size);
460 extern int __init efi_uart_console_only (void);
461 extern void efi_initialize_iomem_resources(struct resource *code_resource,
462 struct resource *data_resource, struct resource *bss_resource);
463 extern unsigned long efi_get_time(void);
464 extern int efi_set_rtc_mmss(unsigned long nowtime);
465 extern void efi_reserve_boot_services(void);
466 extern struct efi_memory_map memmap;
467
468 /**
469 * efi_range_is_wc - check the WC bit on an address range
470 * @start: starting kvirt address
471 * @len: length of range
472 *
473 * Consult the EFI memory map and make sure it's ok to set this range WC.
474 * Returns true or false.
475 */
efi_range_is_wc(unsigned long start,unsigned long len)476 static inline int efi_range_is_wc(unsigned long start, unsigned long len)
477 {
478 unsigned long i;
479
480 for (i = 0; i < len; i += (1UL << EFI_PAGE_SHIFT)) {
481 unsigned long paddr = __pa(start + i);
482 if (!(efi_mem_attributes(paddr) & EFI_MEMORY_WC))
483 return 0;
484 }
485 /* The range checked out */
486 return 1;
487 }
488
489 #ifdef CONFIG_EFI_PCDP
490 extern int __init efi_setup_pcdp_console(char *);
491 #endif
492
493 /*
494 * We play games with efi_enabled so that the compiler will, if possible, remove
495 * EFI-related code altogether.
496 */
497 #ifdef CONFIG_EFI
498 # ifdef CONFIG_X86
499 extern int efi_enabled;
500 # else
501 # define efi_enabled 1
502 # endif
503 #else
504 # define efi_enabled 0
505 #endif
506
507 /*
508 * Variable Attributes
509 */
510 #define EFI_VARIABLE_NON_VOLATILE 0x0000000000000001
511 #define EFI_VARIABLE_BOOTSERVICE_ACCESS 0x0000000000000002
512 #define EFI_VARIABLE_RUNTIME_ACCESS 0x0000000000000004
513
514 /*
515 * The type of search to perform when calling boottime->locate_handle
516 */
517 #define EFI_LOCATE_ALL_HANDLES 0
518 #define EFI_LOCATE_BY_REGISTER_NOTIFY 1
519 #define EFI_LOCATE_BY_PROTOCOL 2
520
521 /*
522 * EFI Device Path information
523 */
524 #define EFI_DEV_HW 0x01
525 #define EFI_DEV_PCI 1
526 #define EFI_DEV_PCCARD 2
527 #define EFI_DEV_MEM_MAPPED 3
528 #define EFI_DEV_VENDOR 4
529 #define EFI_DEV_CONTROLLER 5
530 #define EFI_DEV_ACPI 0x02
531 #define EFI_DEV_BASIC_ACPI 1
532 #define EFI_DEV_EXPANDED_ACPI 2
533 #define EFI_DEV_MSG 0x03
534 #define EFI_DEV_MSG_ATAPI 1
535 #define EFI_DEV_MSG_SCSI 2
536 #define EFI_DEV_MSG_FC 3
537 #define EFI_DEV_MSG_1394 4
538 #define EFI_DEV_MSG_USB 5
539 #define EFI_DEV_MSG_USB_CLASS 15
540 #define EFI_DEV_MSG_I20 6
541 #define EFI_DEV_MSG_MAC 11
542 #define EFI_DEV_MSG_IPV4 12
543 #define EFI_DEV_MSG_IPV6 13
544 #define EFI_DEV_MSG_INFINIBAND 9
545 #define EFI_DEV_MSG_UART 14
546 #define EFI_DEV_MSG_VENDOR 10
547 #define EFI_DEV_MEDIA 0x04
548 #define EFI_DEV_MEDIA_HARD_DRIVE 1
549 #define EFI_DEV_MEDIA_CDROM 2
550 #define EFI_DEV_MEDIA_VENDOR 3
551 #define EFI_DEV_MEDIA_FILE 4
552 #define EFI_DEV_MEDIA_PROTOCOL 5
553 #define EFI_DEV_BIOS_BOOT 0x05
554 #define EFI_DEV_END_PATH 0x7F
555 #define EFI_DEV_END_PATH2 0xFF
556 #define EFI_DEV_END_INSTANCE 0x01
557 #define EFI_DEV_END_ENTIRE 0xFF
558
559 struct efi_generic_dev_path {
560 u8 type;
561 u8 sub_type;
562 u16 length;
563 } __attribute ((packed));
564
memrange_efi_to_native(u64 * addr,u64 * npages)565 static inline void memrange_efi_to_native(u64 *addr, u64 *npages)
566 {
567 *npages = PFN_UP(*addr + (*npages<<EFI_PAGE_SHIFT)) - PFN_DOWN(*addr);
568 *addr &= PAGE_MASK;
569 }
570
571 #if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
572 /*
573 * EFI Variable support.
574 *
575 * Different firmware drivers can expose their EFI-like variables using
576 * the following.
577 */
578
579 struct efivar_operations {
580 efi_get_variable_t *get_variable;
581 efi_get_next_variable_t *get_next_variable;
582 efi_set_variable_t *set_variable;
583 };
584
585 struct efivars {
586 /*
587 * ->lock protects two things:
588 * 1) ->list - adds, removals, reads, writes
589 * 2) ops.[gs]et_variable() calls.
590 * It must not be held when creating sysfs entries or calling kmalloc.
591 * ops.get_next_variable() is only called from register_efivars(),
592 * which is protected by the BKL, so that path is safe.
593 */
594 spinlock_t lock;
595 struct list_head list;
596 struct kset *kset;
597 struct bin_attribute *new_var, *del_var;
598 const struct efivar_operations *ops;
599 struct efivar_entry *walk_entry;
600 struct pstore_info efi_pstore_info;
601 };
602
603 int register_efivars(struct efivars *efivars,
604 const struct efivar_operations *ops,
605 struct kobject *parent_kobj);
606 void unregister_efivars(struct efivars *efivars);
607
608 #endif /* CONFIG_EFI_VARS */
609
610 #endif /* _LINUX_EFI_H */
611