5 * Extensible Firmware Interface
6 * Based on 'Extensible Firmware Interface Specification' version 0.9, April 30, 1999
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>
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>
27 #define EFI_LOAD_ERROR ( 1 | (1UL << (BITS_PER_LONG-1)))
28 #define EFI_INVALID_PARAMETER ( 2 | (1UL << (BITS_PER_LONG-1)))
29 #define EFI_UNSUPPORTED ( 3 | (1UL << (BITS_PER_LONG-1)))
30 #define EFI_BAD_BUFFER_SIZE ( 4 | (1UL << (BITS_PER_LONG-1)))
31 #define EFI_BUFFER_TOO_SMALL ( 5 | (1UL << (BITS_PER_LONG-1)))
32 #define EFI_NOT_READY ( 6 | (1UL << (BITS_PER_LONG-1)))
33 #define EFI_DEVICE_ERROR ( 7 | (1UL << (BITS_PER_LONG-1)))
34 #define EFI_WRITE_PROTECTED ( 8 | (1UL << (BITS_PER_LONG-1)))
35 #define EFI_OUT_OF_RESOURCES ( 9 | (1UL << (BITS_PER_LONG-1)))
36 #define EFI_NOT_FOUND (14 | (1UL << (BITS_PER_LONG-1)))
37 #define EFI_SECURITY_VIOLATION (26 | (1UL << (BITS_PER_LONG-1)))
39 typedef unsigned long efi_status_t;
40 typedef u8 efi_bool_t;
41 typedef u16 efi_char16_t; /* UNICODE character */
42 typedef u64 efi_physical_addr_t;
43 typedef void *efi_handle_t;
50 #define EFI_GUID(a,b,c,d0,d1,d2,d3,d4,d5,d6,d7) \
52 {{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
53 (b) & 0xff, ((b) >> 8) & 0xff, \
54 (c) & 0xff, ((c) >> 8) & 0xff, \
55 (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
58 * Generic EFI table header
69 * Memory map descriptor:
73 #define EFI_RESERVED_TYPE 0
74 #define EFI_LOADER_CODE 1
75 #define EFI_LOADER_DATA 2
76 #define EFI_BOOT_SERVICES_CODE 3
77 #define EFI_BOOT_SERVICES_DATA 4
78 #define EFI_RUNTIME_SERVICES_CODE 5
79 #define EFI_RUNTIME_SERVICES_DATA 6
80 #define EFI_CONVENTIONAL_MEMORY 7
81 #define EFI_UNUSABLE_MEMORY 8
82 #define EFI_ACPI_RECLAIM_MEMORY 9
83 #define EFI_ACPI_MEMORY_NVS 10
84 #define EFI_MEMORY_MAPPED_IO 11
85 #define EFI_MEMORY_MAPPED_IO_PORT_SPACE 12
86 #define EFI_PAL_CODE 13
87 #define EFI_MAX_MEMORY_TYPE 14
89 /* Attribute values: */
90 #define EFI_MEMORY_UC ((u64)0x0000000000000001ULL) /* uncached */
91 #define EFI_MEMORY_WC ((u64)0x0000000000000002ULL) /* write-coalescing */
92 #define EFI_MEMORY_WT ((u64)0x0000000000000004ULL) /* write-through */
93 #define EFI_MEMORY_WB ((u64)0x0000000000000008ULL) /* write-back */
94 #define EFI_MEMORY_WP ((u64)0x0000000000001000ULL) /* write-protect */
95 #define EFI_MEMORY_RP ((u64)0x0000000000002000ULL) /* read-protect */
96 #define EFI_MEMORY_XP ((u64)0x0000000000004000ULL) /* execute-protect */
97 #define EFI_MEMORY_RUNTIME ((u64)0x8000000000000000ULL) /* range requires runtime mapping */
98 #define EFI_MEMORY_DESCRIPTOR_VERSION 1
100 #define EFI_PAGE_SHIFT 12
101 #define EFI_PAGE_SIZE (1UL << EFI_PAGE_SHIFT)
117 } efi_capsule_header_t;
120 * Allocation types for calls to boottime->allocate_pages.
122 #define EFI_ALLOCATE_ANY_PAGES 0
123 #define EFI_ALLOCATE_MAX_ADDRESS 1
124 #define EFI_ALLOCATE_ADDRESS 2
125 #define EFI_MAX_ALLOCATE_TYPE 3
127 typedef int (*efi_freemem_callback_t) (u64 start, u64 end, void *arg);
130 * Types and defines for Time Services
132 #define EFI_TIME_ADJUST_DAYLIGHT 0x1
133 #define EFI_TIME_IN_DAYLIGHT 0x2
134 #define EFI_UNSPECIFIED_TIMEZONE 0x07ff
157 * EFI Boot Services table
163 efi_status_t (*allocate_pages)(int, int, unsigned long,
164 efi_physical_addr_t *);
165 efi_status_t (*free_pages)(efi_physical_addr_t, unsigned long);
166 efi_status_t (*get_memory_map)(unsigned long *, void *, unsigned long *,
167 unsigned long *, u32 *);
168 efi_status_t (*allocate_pool)(int, unsigned long, void **);
169 efi_status_t (*free_pool)(void *);
172 void *wait_for_event;
176 void *install_protocol_interface;
177 void *reinstall_protocol_interface;
178 void *uninstall_protocol_interface;
179 efi_status_t (*handle_protocol)(efi_handle_t, efi_guid_t *, void **);
181 void *register_protocol_notify;
183 void *locate_device_path;
184 void *install_configuration_table;
189 efi_status_t (*exit_boot_services)(efi_handle_t, unsigned long);
190 void *get_next_monotonic_count;
192 void *set_watchdog_timer;
193 void *connect_controller;
194 void *disconnect_controller;
196 void *close_protocol;
197 void *open_protocol_information;
198 void *protocols_per_handle;
199 void *locate_handle_buffer;
200 void *locate_protocol;
201 void *install_multiple_protocol_interfaces;
202 void *uninstall_multiple_protocol_interfaces;
203 void *calculate_crc32;
206 void *create_event_ex;
207 } efi_boot_services_t;
214 EfiPciIoWidthFifoUint8,
215 EfiPciIoWidthFifoUint16,
216 EfiPciIoWidthFifoUint32,
217 EfiPciIoWidthFifoUint64,
218 EfiPciIoWidthFillUint8,
219 EfiPciIoWidthFillUint16,
220 EfiPciIoWidthFillUint32,
221 EfiPciIoWidthFillUint64,
223 } EFI_PCI_IO_PROTOCOL_WIDTH;
226 EfiPciIoAttributeOperationGet,
227 EfiPciIoAttributeOperationSet,
228 EfiPciIoAttributeOperationEnable,
229 EfiPciIoAttributeOperationDisable,
230 EfiPciIoAttributeOperationSupported,
231 EfiPciIoAttributeOperationMaximum
232 } EFI_PCI_IO_PROTOCOL_ATTRIBUTE_OPERATION;
238 } efi_pci_io_protocol_access_t;
243 efi_pci_io_protocol_access_t mem;
244 efi_pci_io_protocol_access_t io;
245 efi_pci_io_protocol_access_t pci;
249 void *allocate_buffer;
254 void *get_bar_attributes;
255 void *set_bar_attributes;
258 } efi_pci_io_protocol;
260 #define EFI_PCI_IO_ATTRIBUTE_ISA_MOTHERBOARD_IO 0x0001
261 #define EFI_PCI_IO_ATTRIBUTE_ISA_IO 0x0002
262 #define EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO 0x0004
263 #define EFI_PCI_IO_ATTRIBUTE_VGA_MEMORY 0x0008
264 #define EFI_PCI_IO_ATTRIBUTE_VGA_IO 0x0010
265 #define EFI_PCI_IO_ATTRIBUTE_IDE_PRIMARY_IO 0x0020
266 #define EFI_PCI_IO_ATTRIBUTE_IDE_SECONDARY_IO 0x0040
267 #define EFI_PCI_IO_ATTRIBUTE_MEMORY_WRITE_COMBINE 0x0080
268 #define EFI_PCI_IO_ATTRIBUTE_IO 0x0100
269 #define EFI_PCI_IO_ATTRIBUTE_MEMORY 0x0200
270 #define EFI_PCI_IO_ATTRIBUTE_BUS_MASTER 0x0400
271 #define EFI_PCI_IO_ATTRIBUTE_MEMORY_CACHED 0x0800
272 #define EFI_PCI_IO_ATTRIBUTE_MEMORY_DISABLE 0x1000
273 #define EFI_PCI_IO_ATTRIBUTE_EMBEDDED_DEVICE 0x2000
274 #define EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM 0x4000
275 #define EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE 0x8000
276 #define EFI_PCI_IO_ATTRIBUTE_ISA_IO_16 0x10000
277 #define EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO_16 0x20000
278 #define EFI_PCI_IO_ATTRIBUTE_VGA_IO_16 0x40000
281 * Types and defines for EFI ResetSystem
283 #define EFI_RESET_COLD 0
284 #define EFI_RESET_WARM 1
285 #define EFI_RESET_SHUTDOWN 2
288 * EFI Runtime Services table
290 #define EFI_RUNTIME_SERVICES_SIGNATURE ((u64)0x5652453544e5552ULL)
291 #define EFI_RUNTIME_SERVICES_REVISION 0x00010000
297 void *get_wakeup_time;
298 void *set_wakeup_time;
299 void *set_virtual_address_map;
300 void *convert_pointer;
302 void *get_next_variable;
304 void *get_next_high_mono_count;
306 void *update_capsule;
307 void *query_capsule_caps;
308 void *query_variable_info;
309 } efi_runtime_services_t;
311 typedef efi_status_t efi_get_time_t (efi_time_t *tm, efi_time_cap_t *tc);
312 typedef efi_status_t efi_set_time_t (efi_time_t *tm);
313 typedef efi_status_t efi_get_wakeup_time_t (efi_bool_t *enabled, efi_bool_t *pending,
315 typedef efi_status_t efi_set_wakeup_time_t (efi_bool_t enabled, efi_time_t *tm);
316 typedef efi_status_t efi_get_variable_t (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,
317 unsigned long *data_size, void *data);
318 typedef efi_status_t efi_get_next_variable_t (unsigned long *name_size, efi_char16_t *name,
320 typedef efi_status_t efi_set_variable_t (efi_char16_t *name, efi_guid_t *vendor,
321 u32 attr, unsigned long data_size,
323 typedef efi_status_t efi_get_next_high_mono_count_t (u32 *count);
324 typedef void efi_reset_system_t (int reset_type, efi_status_t status,
325 unsigned long data_size, efi_char16_t *data);
326 typedef efi_status_t efi_set_virtual_address_map_t (unsigned long memory_map_size,
327 unsigned long descriptor_size,
328 u32 descriptor_version,
329 efi_memory_desc_t *virtual_map);
330 typedef efi_status_t efi_query_variable_info_t(u32 attr,
332 u64 *remaining_space,
333 u64 *max_variable_size);
334 typedef efi_status_t efi_update_capsule_t(efi_capsule_header_t **capsules,
336 unsigned long sg_list);
337 typedef efi_status_t efi_query_capsule_caps_t(efi_capsule_header_t **capsules,
341 typedef efi_status_t efi_query_variable_store_t(u32 attributes, unsigned long size);
344 * EFI Configuration Table and GUID definitions
347 EFI_GUID( 0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 )
349 #define MPS_TABLE_GUID \
350 EFI_GUID( 0xeb9d2d2f, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
352 #define ACPI_TABLE_GUID \
353 EFI_GUID( 0xeb9d2d30, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
355 #define ACPI_20_TABLE_GUID \
356 EFI_GUID( 0x8868e871, 0xe4f1, 0x11d3, 0xbc, 0x22, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81 )
358 #define SMBIOS_TABLE_GUID \
359 EFI_GUID( 0xeb9d2d31, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
361 #define SAL_SYSTEM_TABLE_GUID \
362 EFI_GUID( 0xeb9d2d32, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
364 #define HCDP_TABLE_GUID \
365 EFI_GUID( 0xf951938d, 0x620b, 0x42ef, 0x82, 0x79, 0xa8, 0x4b, 0x79, 0x61, 0x78, 0x98 )
367 #define UGA_IO_PROTOCOL_GUID \
368 EFI_GUID( 0x61a4d49e, 0x6f68, 0x4f1b, 0xb9, 0x22, 0xa8, 0x6e, 0xed, 0xb, 0x7, 0xa2 )
370 #define EFI_GLOBAL_VARIABLE_GUID \
371 EFI_GUID( 0x8be4df61, 0x93ca, 0x11d2, 0xaa, 0x0d, 0x00, 0xe0, 0x98, 0x03, 0x2b, 0x8c )
373 #define UV_SYSTEM_TABLE_GUID \
374 EFI_GUID( 0x3b13a7d4, 0x633e, 0x11dd, 0x93, 0xec, 0xda, 0x25, 0x56, 0xd8, 0x95, 0x93 )
376 #define LINUX_EFI_CRASH_GUID \
377 EFI_GUID( 0xcfc8fc79, 0xbe2e, 0x4ddc, 0x97, 0xf0, 0x9f, 0x98, 0xbf, 0xe2, 0x98, 0xa0 )
379 #define LOADED_IMAGE_PROTOCOL_GUID \
380 EFI_GUID( 0x5b1b31a1, 0x9562, 0x11d2, 0x8e, 0x3f, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b )
382 #define EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID \
383 EFI_GUID( 0x9042a9de, 0x23dc, 0x4a38, 0x96, 0xfb, 0x7a, 0xde, 0xd0, 0x80, 0x51, 0x6a )
385 #define EFI_UGA_PROTOCOL_GUID \
386 EFI_GUID( 0x982c298b, 0xf4fa, 0x41cb, 0xb8, 0x38, 0x77, 0xaa, 0x68, 0x8f, 0xb8, 0x39 )
388 #define EFI_PCI_IO_PROTOCOL_GUID \
389 EFI_GUID( 0x4cf5b200, 0x68b8, 0x4ca5, 0x9e, 0xec, 0xb2, 0x3e, 0x3f, 0x50, 0x2, 0x9a )
391 #define EFI_FILE_INFO_ID \
392 EFI_GUID( 0x9576e92, 0x6d3f, 0x11d2, 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b )
394 #define EFI_FILE_SYSTEM_GUID \
395 EFI_GUID( 0x964e5b22, 0x6459, 0x11d2, 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b )
400 } efi_config_table_64_t;
405 } efi_config_table_32_t;
410 } efi_config_table_t;
416 } efi_config_table_type_t;
418 #define EFI_SYSTEM_TABLE_SIGNATURE ((u64)0x5453595320494249ULL)
420 #define EFI_2_30_SYSTEM_TABLE_REVISION ((2 << 16) | (30))
421 #define EFI_2_20_SYSTEM_TABLE_REVISION ((2 << 16) | (20))
422 #define EFI_2_10_SYSTEM_TABLE_REVISION ((2 << 16) | (10))
423 #define EFI_2_00_SYSTEM_TABLE_REVISION ((2 << 16) | (00))
424 #define EFI_1_10_SYSTEM_TABLE_REVISION ((1 << 16) | (10))
425 #define EFI_1_02_SYSTEM_TABLE_REVISION ((1 << 16) | (02))
429 u64 fw_vendor; /* physical addr of CHAR16 vendor string */
443 } efi_system_table_64_t;
447 u32 fw_vendor; /* physical addr of CHAR16 vendor string */
459 } efi_system_table_32_t;
463 unsigned long fw_vendor; /* physical addr of CHAR16 vendor string */
465 unsigned long con_in_handle;
466 unsigned long con_in;
467 unsigned long con_out_handle;
468 unsigned long con_out;
469 unsigned long stderr_handle;
470 unsigned long stderr;
471 efi_runtime_services_t *runtime;
472 efi_boot_services_t *boottime;
473 unsigned long nr_tables;
474 unsigned long tables;
475 } efi_system_table_t;
477 struct efi_memory_map {
482 unsigned long desc_version;
483 unsigned long desc_size;
489 efi_system_table_t *system_table;
493 u32 load_options_size;
496 __aligned_u64 image_size;
497 unsigned int image_code_type;
498 unsigned int image_data_type;
499 unsigned long unload;
500 } efi_loaded_image_t;
507 efi_time_t create_time;
508 efi_time_t last_access_time;
509 efi_time_t modification_time;
510 __aligned_u64 attribute;
511 efi_char16_t filename[1];
514 typedef struct _efi_file_handle {
516 efi_status_t (*open)(struct _efi_file_handle *,
517 struct _efi_file_handle **,
518 efi_char16_t *, u64, u64);
519 efi_status_t (*close)(struct _efi_file_handle *);
521 efi_status_t (*read)(struct _efi_file_handle *, unsigned long *,
526 efi_status_t (*get_info)(struct _efi_file_handle *, efi_guid_t *,
527 unsigned long *, void *);
532 typedef struct _efi_file_io_interface {
534 int (*open_volume)(struct _efi_file_io_interface *,
535 efi_file_handle_t **);
536 } efi_file_io_interface_t;
538 #define EFI_FILE_MODE_READ 0x0000000000000001
539 #define EFI_FILE_MODE_WRITE 0x0000000000000002
540 #define EFI_FILE_MODE_CREATE 0x8000000000000000
542 #define EFI_INVALID_TABLE_ADDR (~0UL)
545 * All runtime access to EFI goes through this structure:
548 efi_system_table_t *systab; /* EFI system table */
549 unsigned int runtime_version; /* Runtime services version */
550 unsigned long mps; /* MPS table */
551 unsigned long acpi; /* ACPI table (IA64 ext 0.71) */
552 unsigned long acpi20; /* ACPI table (ACPI 2.0) */
553 unsigned long smbios; /* SM BIOS table */
554 unsigned long sal_systab; /* SAL system table */
555 unsigned long boot_info; /* boot info table */
556 unsigned long hcdp; /* HCDP table */
557 unsigned long uga; /* UGA table */
558 unsigned long uv_systab; /* UV system table */
559 efi_get_time_t *get_time;
560 efi_set_time_t *set_time;
561 efi_get_wakeup_time_t *get_wakeup_time;
562 efi_set_wakeup_time_t *set_wakeup_time;
563 efi_get_variable_t *get_variable;
564 efi_get_next_variable_t *get_next_variable;
565 efi_set_variable_t *set_variable;
566 efi_query_variable_info_t *query_variable_info;
567 efi_update_capsule_t *update_capsule;
568 efi_query_capsule_caps_t *query_capsule_caps;
569 efi_get_next_high_mono_count_t *get_next_high_mono_count;
570 efi_reset_system_t *reset_system;
571 efi_set_virtual_address_map_t *set_virtual_address_map;
572 struct efi_memory_map *memmap;
576 efi_guidcmp (efi_guid_t left, efi_guid_t right)
578 return memcmp(&left, &right, sizeof (efi_guid_t));
582 efi_guid_unparse(efi_guid_t *guid, char *out)
584 sprintf(out, "%pUl", guid->b);
588 extern void efi_init (void);
589 extern void *efi_get_pal_addr (void);
590 extern void efi_map_pal_code (void);
591 extern void efi_memmap_walk (efi_freemem_callback_t callback, void *arg);
592 extern void efi_gettimeofday (struct timespec *ts);
593 extern void efi_enter_virtual_mode (void); /* switch EFI to virtual mode, if possible */
595 extern void efi_late_init(void);
596 extern void efi_free_boot_services(void);
597 extern efi_status_t efi_query_variable_store(u32 attributes, unsigned long size);
599 static inline void efi_late_init(void) {}
600 static inline void efi_free_boot_services(void) {}
602 static inline efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
607 extern void __iomem *efi_lookup_mapped_addr(u64 phys_addr);
608 extern int efi_config_init(efi_config_table_type_t *arch_tables);
609 extern u64 efi_get_iobase (void);
610 extern u32 efi_mem_type (unsigned long phys_addr);
611 extern u64 efi_mem_attributes (unsigned long phys_addr);
612 extern u64 efi_mem_attribute (unsigned long phys_addr, unsigned long size);
613 extern int __init efi_uart_console_only (void);
614 extern void efi_initialize_iomem_resources(struct resource *code_resource,
615 struct resource *data_resource, struct resource *bss_resource);
616 extern void efi_get_time(struct timespec *now);
617 extern int efi_set_rtc_mmss(const struct timespec *now);
618 extern void efi_reserve_boot_services(void);
619 extern struct efi_memory_map memmap;
622 * efi_range_is_wc - check the WC bit on an address range
623 * @start: starting kvirt address
624 * @len: length of range
626 * Consult the EFI memory map and make sure it's ok to set this range WC.
627 * Returns true or false.
629 static inline int efi_range_is_wc(unsigned long start, unsigned long len)
633 for (i = 0; i < len; i += (1UL << EFI_PAGE_SHIFT)) {
634 unsigned long paddr = __pa(start + i);
635 if (!(efi_mem_attributes(paddr) & EFI_MEMORY_WC))
638 /* The range checked out */
642 #ifdef CONFIG_EFI_PCDP
643 extern int __init efi_setup_pcdp_console(char *);
647 * We play games with efi_enabled so that the compiler will, if
648 * possible, remove EFI-related code altogether.
650 #define EFI_BOOT 0 /* Were we booted from EFI? */
651 #define EFI_SYSTEM_TABLES 1 /* Can we use EFI system tables? */
652 #define EFI_CONFIG_TABLES 2 /* Can we use EFI config tables? */
653 #define EFI_RUNTIME_SERVICES 3 /* Can we use runtime services? */
654 #define EFI_MEMMAP 4 /* Can we use EFI memory map? */
655 #define EFI_64BIT 5 /* Is the firmware 64-bit? */
659 extern int efi_enabled(int facility);
661 static inline int efi_enabled(int facility)
667 static inline int efi_enabled(int facility)
674 * Variable Attributes
676 #define EFI_VARIABLE_NON_VOLATILE 0x0000000000000001
677 #define EFI_VARIABLE_BOOTSERVICE_ACCESS 0x0000000000000002
678 #define EFI_VARIABLE_RUNTIME_ACCESS 0x0000000000000004
679 #define EFI_VARIABLE_HARDWARE_ERROR_RECORD 0x0000000000000008
680 #define EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS 0x0000000000000010
681 #define EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS 0x0000000000000020
682 #define EFI_VARIABLE_APPEND_WRITE 0x0000000000000040
684 #define EFI_VARIABLE_MASK (EFI_VARIABLE_NON_VOLATILE | \
685 EFI_VARIABLE_BOOTSERVICE_ACCESS | \
686 EFI_VARIABLE_RUNTIME_ACCESS | \
687 EFI_VARIABLE_HARDWARE_ERROR_RECORD | \
688 EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS | \
689 EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS | \
690 EFI_VARIABLE_APPEND_WRITE)
692 * Length of a GUID string (strlen("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"))
693 * not including trailing NUL
695 #define EFI_VARIABLE_GUID_LEN 36
698 * The type of search to perform when calling boottime->locate_handle
700 #define EFI_LOCATE_ALL_HANDLES 0
701 #define EFI_LOCATE_BY_REGISTER_NOTIFY 1
702 #define EFI_LOCATE_BY_PROTOCOL 2
705 * EFI Device Path information
707 #define EFI_DEV_HW 0x01
708 #define EFI_DEV_PCI 1
709 #define EFI_DEV_PCCARD 2
710 #define EFI_DEV_MEM_MAPPED 3
711 #define EFI_DEV_VENDOR 4
712 #define EFI_DEV_CONTROLLER 5
713 #define EFI_DEV_ACPI 0x02
714 #define EFI_DEV_BASIC_ACPI 1
715 #define EFI_DEV_EXPANDED_ACPI 2
716 #define EFI_DEV_MSG 0x03
717 #define EFI_DEV_MSG_ATAPI 1
718 #define EFI_DEV_MSG_SCSI 2
719 #define EFI_DEV_MSG_FC 3
720 #define EFI_DEV_MSG_1394 4
721 #define EFI_DEV_MSG_USB 5
722 #define EFI_DEV_MSG_USB_CLASS 15
723 #define EFI_DEV_MSG_I20 6
724 #define EFI_DEV_MSG_MAC 11
725 #define EFI_DEV_MSG_IPV4 12
726 #define EFI_DEV_MSG_IPV6 13
727 #define EFI_DEV_MSG_INFINIBAND 9
728 #define EFI_DEV_MSG_UART 14
729 #define EFI_DEV_MSG_VENDOR 10
730 #define EFI_DEV_MEDIA 0x04
731 #define EFI_DEV_MEDIA_HARD_DRIVE 1
732 #define EFI_DEV_MEDIA_CDROM 2
733 #define EFI_DEV_MEDIA_VENDOR 3
734 #define EFI_DEV_MEDIA_FILE 4
735 #define EFI_DEV_MEDIA_PROTOCOL 5
736 #define EFI_DEV_BIOS_BOOT 0x05
737 #define EFI_DEV_END_PATH 0x7F
738 #define EFI_DEV_END_PATH2 0xFF
739 #define EFI_DEV_END_INSTANCE 0x01
740 #define EFI_DEV_END_ENTIRE 0xFF
742 struct efi_generic_dev_path {
746 } __attribute ((packed));
748 static inline void memrange_efi_to_native(u64 *addr, u64 *npages)
750 *npages = PFN_UP(*addr + (*npages<<EFI_PAGE_SHIFT)) - PFN_DOWN(*addr);
755 * EFI Variable support.
757 * Different firmware drivers can expose their EFI-like variables using
761 struct efivar_operations {
762 efi_get_variable_t *get_variable;
763 efi_get_next_variable_t *get_next_variable;
764 efi_set_variable_t *set_variable;
765 efi_query_variable_store_t *query_variable_store;
770 * ->lock protects two things:
771 * 1) ->list - adds, removals, reads, writes
772 * 2) ops.[gs]et_variable() calls.
773 * It must not be held when creating sysfs entries or calling kmalloc.
774 * ops.get_next_variable() is only called from register_efivars()
775 * or efivar_update_sysfs_entries(),
776 * which is protected by the BKL, so that path is safe.
780 struct kobject *kobject;
781 const struct efivar_operations *ops;
785 * The maximum size of VariableName + Data = 1024
786 * Therefore, it's reasonable to save that much
787 * space in each part of the structure,
788 * and we use a page for reading/writing.
791 struct efi_variable {
792 efi_char16_t VariableName[1024/sizeof(efi_char16_t)];
793 efi_guid_t VendorGuid;
794 unsigned long DataSize;
798 } __attribute__((packed));
800 struct efivar_entry {
801 struct efi_variable var;
802 struct list_head list;
807 struct efi_simple_text_output_protocol {
809 efi_status_t (*output_string)(void *, void *);
813 extern struct list_head efivar_sysfs_list;
816 efivar_unregister(struct efivar_entry *var)
818 kobject_put(&var->kobj);
821 int efivars_register(struct efivars *efivars,
822 const struct efivar_operations *ops,
823 struct kobject *kobject);
824 int efivars_unregister(struct efivars *efivars);
825 struct kobject *efivars_kobject(void);
827 int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
828 void *data, bool atomic, bool duplicates,
829 struct list_head *head);
831 void efivar_entry_add(struct efivar_entry *entry, struct list_head *head);
832 void efivar_entry_remove(struct efivar_entry *entry);
834 int __efivar_entry_delete(struct efivar_entry *entry);
835 int efivar_entry_delete(struct efivar_entry *entry);
837 int efivar_entry_size(struct efivar_entry *entry, unsigned long *size);
838 int __efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
839 unsigned long *size, void *data);
840 int efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
841 unsigned long *size, void *data);
842 int efivar_entry_set(struct efivar_entry *entry, u32 attributes,
843 unsigned long size, void *data, struct list_head *head);
844 int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
845 unsigned long *size, void *data, bool *set);
846 int efivar_entry_set_safe(efi_char16_t *name, efi_guid_t vendor, u32 attributes,
847 bool block, unsigned long size, void *data);
849 void efivar_entry_iter_begin(void);
850 void efivar_entry_iter_end(void);
852 int __efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
853 struct list_head *head, void *data,
854 struct efivar_entry **prev);
855 int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
856 struct list_head *head, void *data);
858 struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
859 struct list_head *head, bool remove);
861 bool efivar_validate(struct efi_variable *var, u8 *data, unsigned long len);
863 extern struct work_struct efivar_work;
864 void efivar_run_worker(void);
866 #if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
867 int efivars_sysfs_init(void);
869 #endif /* CONFIG_EFI_VARS */
871 #endif /* _LINUX_EFI_H */