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TOMOYO Linux Cross Reference
Linux/include/linux/efi.h

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  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_READY           ( 6 | (1UL << (BITS_PER_LONG-1)))
 34 #define EFI_DEVICE_ERROR        ( 7 | (1UL << (BITS_PER_LONG-1)))
 35 #define EFI_WRITE_PROTECTED     ( 8 | (1UL << (BITS_PER_LONG-1)))
 36 #define EFI_OUT_OF_RESOURCES    ( 9 | (1UL << (BITS_PER_LONG-1)))
 37 #define EFI_NOT_FOUND           (14 | (1UL << (BITS_PER_LONG-1)))
 38 #define EFI_SECURITY_VIOLATION  (26 | (1UL << (BITS_PER_LONG-1)))
 39 
 40 typedef unsigned long efi_status_t;
 41 typedef u8 efi_bool_t;
 42 typedef u16 efi_char16_t;               /* UNICODE character */
 43 
 44 
 45 typedef struct {
 46         u8 b[16];
 47 } efi_guid_t;
 48 
 49 #define EFI_GUID(a,b,c,d0,d1,d2,d3,d4,d5,d6,d7) \
 50 ((efi_guid_t) \
 51 {{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
 52   (b) & 0xff, ((b) >> 8) & 0xff, \
 53   (c) & 0xff, ((c) >> 8) & 0xff, \
 54   (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
 55 
 56 /*
 57  * Generic EFI table header
 58  */
 59 typedef struct {
 60         u64 signature;
 61         u32 revision;
 62         u32 headersize;
 63         u32 crc32;
 64         u32 reserved;
 65 } efi_table_hdr_t;
 66 
 67 /*
 68  * Memory map descriptor:
 69  */
 70 
 71 /* Memory types: */
 72 #define EFI_RESERVED_TYPE                0
 73 #define EFI_LOADER_CODE                  1
 74 #define EFI_LOADER_DATA                  2
 75 #define EFI_BOOT_SERVICES_CODE           3
 76 #define EFI_BOOT_SERVICES_DATA           4
 77 #define EFI_RUNTIME_SERVICES_CODE        5
 78 #define EFI_RUNTIME_SERVICES_DATA        6
 79 #define EFI_CONVENTIONAL_MEMORY          7
 80 #define EFI_UNUSABLE_MEMORY              8
 81 #define EFI_ACPI_RECLAIM_MEMORY          9
 82 #define EFI_ACPI_MEMORY_NVS             10
 83 #define EFI_MEMORY_MAPPED_IO            11
 84 #define EFI_MEMORY_MAPPED_IO_PORT_SPACE 12
 85 #define EFI_PAL_CODE                    13
 86 #define EFI_MAX_MEMORY_TYPE             14
 87 
 88 /* Attribute values: */
 89 #define EFI_MEMORY_UC           ((u64)0x0000000000000001ULL)    /* uncached */
 90 #define EFI_MEMORY_WC           ((u64)0x0000000000000002ULL)    /* write-coalescing */
 91 #define EFI_MEMORY_WT           ((u64)0x0000000000000004ULL)    /* write-through */
 92 #define EFI_MEMORY_WB           ((u64)0x0000000000000008ULL)    /* write-back */
 93 #define EFI_MEMORY_WP           ((u64)0x0000000000001000ULL)    /* write-protect */
 94 #define EFI_MEMORY_RP           ((u64)0x0000000000002000ULL)    /* read-protect */
 95 #define EFI_MEMORY_XP           ((u64)0x0000000000004000ULL)    /* execute-protect */
 96 #define EFI_MEMORY_RUNTIME      ((u64)0x8000000000000000ULL)    /* range requires runtime mapping */
 97 #define EFI_MEMORY_DESCRIPTOR_VERSION   1
 98 
 99 #define EFI_PAGE_SHIFT          12
100 
101 typedef struct {
102         u32 type;
103         u32 pad;
104         u64 phys_addr;
105         u64 virt_addr;
106         u64 num_pages;
107         u64 attribute;
108 } efi_memory_desc_t;
109 
110 typedef struct {
111         efi_guid_t guid;
112         u32 headersize;
113         u32 flags;
114         u32 imagesize;
115 } efi_capsule_header_t;
116 
117 typedef int (*efi_freemem_callback_t) (u64 start, u64 end, void *arg);
118 
119 /*
120  * Types and defines for Time Services
121  */
122 #define EFI_TIME_ADJUST_DAYLIGHT 0x1
123 #define EFI_TIME_IN_DAYLIGHT     0x2
124 #define EFI_UNSPECIFIED_TIMEZONE 0x07ff
125 
126 typedef struct {
127         u16 year;
128         u8 month;
129         u8 day;
130         u8 hour;
131         u8 minute;
132         u8 second;
133         u8 pad1;
134         u32 nanosecond;
135         s16 timezone;
136         u8 daylight;
137         u8 pad2;
138 } efi_time_t;
139 
140 typedef struct {
141         u32 resolution;
142         u32 accuracy;
143         u8 sets_to_zero;
144 } efi_time_cap_t;
145 
146 /*
147  * Types and defines for EFI ResetSystem
148  */
149 #define EFI_RESET_COLD 0
150 #define EFI_RESET_WARM 1
151 #define EFI_RESET_SHUTDOWN 2
152 
153 /*
154  * EFI Runtime Services table
155  */
156 #define EFI_RUNTIME_SERVICES_SIGNATURE ((u64)0x5652453544e5552ULL)
157 #define EFI_RUNTIME_SERVICES_REVISION  0x00010000
158 
159 typedef struct {
160         efi_table_hdr_t hdr;
161         unsigned long get_time;
162         unsigned long set_time;
163         unsigned long get_wakeup_time;
164         unsigned long set_wakeup_time;
165         unsigned long set_virtual_address_map;
166         unsigned long convert_pointer;
167         unsigned long get_variable;
168         unsigned long get_next_variable;
169         unsigned long set_variable;
170         unsigned long get_next_high_mono_count;
171         unsigned long reset_system;
172         unsigned long update_capsule;
173         unsigned long query_capsule_caps;
174         unsigned long query_variable_info;
175 } efi_runtime_services_t;
176 
177 typedef efi_status_t efi_get_time_t (efi_time_t *tm, efi_time_cap_t *tc);
178 typedef efi_status_t efi_set_time_t (efi_time_t *tm);
179 typedef efi_status_t efi_get_wakeup_time_t (efi_bool_t *enabled, efi_bool_t *pending,
180                                             efi_time_t *tm);
181 typedef efi_status_t efi_set_wakeup_time_t (efi_bool_t enabled, efi_time_t *tm);
182 typedef efi_status_t efi_get_variable_t (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,
183                                          unsigned long *data_size, void *data);
184 typedef efi_status_t efi_get_next_variable_t (unsigned long *name_size, efi_char16_t *name,
185                                               efi_guid_t *vendor);
186 typedef efi_status_t efi_set_variable_t (efi_char16_t *name, efi_guid_t *vendor, 
187                                          u32 attr, unsigned long data_size,
188                                          void *data);
189 typedef efi_status_t efi_get_next_high_mono_count_t (u32 *count);
190 typedef void efi_reset_system_t (int reset_type, efi_status_t status,
191                                  unsigned long data_size, efi_char16_t *data);
192 typedef efi_status_t efi_set_virtual_address_map_t (unsigned long memory_map_size,
193                                                 unsigned long descriptor_size,
194                                                 u32 descriptor_version,
195                                                 efi_memory_desc_t *virtual_map);
196 typedef efi_status_t efi_query_variable_info_t(u32 attr,
197                                                u64 *storage_space,
198                                                u64 *remaining_space,
199                                                u64 *max_variable_size);
200 typedef efi_status_t efi_update_capsule_t(efi_capsule_header_t **capsules,
201                                           unsigned long count,
202                                           unsigned long sg_list);
203 typedef efi_status_t efi_query_capsule_caps_t(efi_capsule_header_t **capsules,
204                                               unsigned long count,
205                                               u64 *max_size,
206                                               int *reset_type);
207 typedef efi_status_t efi_query_variable_store_t(u32 attributes, unsigned long size);
208 
209 /*
210  *  EFI Configuration Table and GUID definitions
211  */
212 #define NULL_GUID \
213     EFI_GUID(  0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 )
214 
215 #define MPS_TABLE_GUID    \
216     EFI_GUID(  0xeb9d2d2f, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
217 
218 #define ACPI_TABLE_GUID    \
219     EFI_GUID(  0xeb9d2d30, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
220 
221 #define ACPI_20_TABLE_GUID    \
222     EFI_GUID(  0x8868e871, 0xe4f1, 0x11d3, 0xbc, 0x22, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81 )
223 
224 #define SMBIOS_TABLE_GUID    \
225     EFI_GUID(  0xeb9d2d31, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
226 
227 #define SAL_SYSTEM_TABLE_GUID    \
228     EFI_GUID(  0xeb9d2d32, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
229 
230 #define HCDP_TABLE_GUID \
231     EFI_GUID(  0xf951938d, 0x620b, 0x42ef, 0x82, 0x79, 0xa8, 0x4b, 0x79, 0x61, 0x78, 0x98 )
232 
233 #define UGA_IO_PROTOCOL_GUID \
234     EFI_GUID(  0x61a4d49e, 0x6f68, 0x4f1b, 0xb9, 0x22, 0xa8, 0x6e, 0xed, 0xb, 0x7, 0xa2 )
235 
236 #define EFI_GLOBAL_VARIABLE_GUID \
237     EFI_GUID(  0x8be4df61, 0x93ca, 0x11d2, 0xaa, 0x0d, 0x00, 0xe0, 0x98, 0x03, 0x2b, 0x8c )
238 
239 #define UV_SYSTEM_TABLE_GUID \
240     EFI_GUID(  0x3b13a7d4, 0x633e, 0x11dd, 0x93, 0xec, 0xda, 0x25, 0x56, 0xd8, 0x95, 0x93 )
241 
242 #define LINUX_EFI_CRASH_GUID \
243     EFI_GUID(  0xcfc8fc79, 0xbe2e, 0x4ddc, 0x97, 0xf0, 0x9f, 0x98, 0xbf, 0xe2, 0x98, 0xa0 )
244 
245 typedef struct {
246         efi_guid_t guid;
247         unsigned long table;
248 } efi_config_table_t;
249 
250 #define EFI_SYSTEM_TABLE_SIGNATURE ((u64)0x5453595320494249ULL)
251 
252 #define EFI_2_30_SYSTEM_TABLE_REVISION  ((2 << 16) | (30))
253 #define EFI_2_20_SYSTEM_TABLE_REVISION  ((2 << 16) | (20))
254 #define EFI_2_10_SYSTEM_TABLE_REVISION  ((2 << 16) | (10))
255 #define EFI_2_00_SYSTEM_TABLE_REVISION  ((2 << 16) | (00))
256 #define EFI_1_10_SYSTEM_TABLE_REVISION  ((1 << 16) | (10))
257 #define EFI_1_02_SYSTEM_TABLE_REVISION  ((1 << 16) | (02))
258 
259 typedef struct {
260         efi_table_hdr_t hdr;
261         unsigned long fw_vendor;        /* physical addr of CHAR16 vendor string */
262         u32 fw_revision;
263         unsigned long con_in_handle;
264         unsigned long con_in;
265         unsigned long con_out_handle;
266         unsigned long con_out;
267         unsigned long stderr_handle;
268         unsigned long stderr;
269         efi_runtime_services_t *runtime;
270         unsigned long boottime;
271         unsigned long nr_tables;
272         unsigned long tables;
273 } efi_system_table_t;
274 
275 struct efi_memory_map {
276         void *phys_map;
277         void *map;
278         void *map_end;
279         int nr_map;
280         unsigned long desc_version;
281         unsigned long desc_size;
282 };
283 
284 #define EFI_INVALID_TABLE_ADDR          (~0UL)
285 
286 /*
287  * All runtime access to EFI goes through this structure:
288  */
289 extern struct efi {
290         efi_system_table_t *systab;     /* EFI system table */
291         unsigned int runtime_version;   /* Runtime services version */
292         unsigned long mps;              /* MPS table */
293         unsigned long acpi;             /* ACPI table  (IA64 ext 0.71) */
294         unsigned long acpi20;           /* ACPI table  (ACPI 2.0) */
295         unsigned long smbios;           /* SM BIOS table */
296         unsigned long sal_systab;       /* SAL system table */
297         unsigned long boot_info;        /* boot info table */
298         unsigned long hcdp;             /* HCDP table */
299         unsigned long uga;              /* UGA table */
300         unsigned long uv_systab;        /* UV system table */
301         efi_get_time_t *get_time;
302         efi_set_time_t *set_time;
303         efi_get_wakeup_time_t *get_wakeup_time;
304         efi_set_wakeup_time_t *set_wakeup_time;
305         efi_get_variable_t *get_variable;
306         efi_get_next_variable_t *get_next_variable;
307         efi_set_variable_t *set_variable;
308         efi_query_variable_info_t *query_variable_info;
309         efi_update_capsule_t *update_capsule;
310         efi_query_capsule_caps_t *query_capsule_caps;
311         efi_get_next_high_mono_count_t *get_next_high_mono_count;
312         efi_reset_system_t *reset_system;
313         efi_set_virtual_address_map_t *set_virtual_address_map;
314 } efi;
315 
316 static inline int
317 efi_guidcmp (efi_guid_t left, efi_guid_t right)
318 {
319         return memcmp(&left, &right, sizeof (efi_guid_t));
320 }
321 
322 static inline char *
323 efi_guid_unparse(efi_guid_t *guid, char *out)
324 {
325         sprintf(out, "%pUl", guid->b);
326         return out;
327 }
328 
329 extern void efi_init (void);
330 extern void *efi_get_pal_addr (void);
331 extern void efi_map_pal_code (void);
332 extern void efi_memmap_walk (efi_freemem_callback_t callback, void *arg);
333 extern void efi_gettimeofday (struct timespec *ts);
334 extern void efi_enter_virtual_mode (void);      /* switch EFI to virtual mode, if possible */
335 #ifdef CONFIG_X86
336 extern efi_status_t efi_query_variable_store(u32 attributes, unsigned long size);
337 #else
338 static inline efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
339 {
340         return EFI_SUCCESS;
341 }
342 #endif
343 extern u64 efi_get_iobase (void);
344 extern u32 efi_mem_type (unsigned long phys_addr);
345 extern u64 efi_mem_attributes (unsigned long phys_addr);
346 extern u64 efi_mem_attribute (unsigned long phys_addr, unsigned long size);
347 extern int __init efi_uart_console_only (void);
348 extern void efi_initialize_iomem_resources(struct resource *code_resource,
349                 struct resource *data_resource, struct resource *bss_resource);
350 extern unsigned long efi_get_time(void);
351 extern int efi_set_rtc_mmss(unsigned long nowtime);
352 extern void efi_reserve_boot_services(void);
353 extern struct efi_memory_map memmap;
354 
355 /**
356  * efi_range_is_wc - check the WC bit on an address range
357  * @start: starting kvirt address
358  * @len: length of range
359  *
360  * Consult the EFI memory map and make sure it's ok to set this range WC.
361  * Returns true or false.
362  */
363 static inline int efi_range_is_wc(unsigned long start, unsigned long len)
364 {
365         unsigned long i;
366 
367         for (i = 0; i < len; i += (1UL << EFI_PAGE_SHIFT)) {
368                 unsigned long paddr = __pa(start + i);
369                 if (!(efi_mem_attributes(paddr) & EFI_MEMORY_WC))
370                         return 0;
371         }
372         /* The range checked out */
373         return 1;
374 }
375 
376 #ifdef CONFIG_EFI_PCDP
377 extern int __init efi_setup_pcdp_console(char *);
378 #endif
379 
380 /*
381  * We play games with efi_enabled so that the compiler will, if
382  * possible, remove EFI-related code altogether.
383  */
384 #define EFI_BOOT                0       /* Were we booted from EFI? */
385 #define EFI_SYSTEM_TABLES       1       /* Can we use EFI system tables? */
386 #define EFI_CONFIG_TABLES       2       /* Can we use EFI config tables? */
387 #define EFI_RUNTIME_SERVICES    3       /* Can we use runtime services? */
388 #define EFI_MEMMAP              4       /* Can we use EFI memory map? */
389 #define EFI_64BIT               5       /* Is the firmware 64-bit? */
390 
391 #ifdef CONFIG_EFI
392 # ifdef CONFIG_X86
393 extern int efi_enabled(int facility);
394 # else
395 static inline int efi_enabled(int facility)
396 {
397         return 1;
398 }
399 # endif
400 #else
401 static inline int efi_enabled(int facility)
402 {
403         return 0;
404 }
405 #endif
406 
407 /*
408  * Variable Attributes
409  */
410 #define EFI_VARIABLE_NON_VOLATILE       0x0000000000000001
411 #define EFI_VARIABLE_BOOTSERVICE_ACCESS 0x0000000000000002
412 #define EFI_VARIABLE_RUNTIME_ACCESS     0x0000000000000004
413 #define EFI_VARIABLE_HARDWARE_ERROR_RECORD 0x0000000000000008
414 #define EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS 0x0000000000000010
415 #define EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS 0x0000000000000020
416 #define EFI_VARIABLE_APPEND_WRITE       0x0000000000000040
417 
418 #define EFI_VARIABLE_MASK       (EFI_VARIABLE_NON_VOLATILE | \
419                                 EFI_VARIABLE_BOOTSERVICE_ACCESS | \
420                                 EFI_VARIABLE_RUNTIME_ACCESS | \
421                                 EFI_VARIABLE_HARDWARE_ERROR_RECORD | \
422                                 EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS | \
423                                 EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS | \
424                                 EFI_VARIABLE_APPEND_WRITE)
425 /*
426  * EFI Device Path information
427  */
428 #define EFI_DEV_HW                      0x01
429 #define  EFI_DEV_PCI                             1
430 #define  EFI_DEV_PCCARD                          2
431 #define  EFI_DEV_MEM_MAPPED                      3
432 #define  EFI_DEV_VENDOR                          4
433 #define  EFI_DEV_CONTROLLER                      5
434 #define EFI_DEV_ACPI                    0x02
435 #define   EFI_DEV_BASIC_ACPI                     1
436 #define   EFI_DEV_EXPANDED_ACPI                  2
437 #define EFI_DEV_MSG                     0x03
438 #define   EFI_DEV_MSG_ATAPI                      1
439 #define   EFI_DEV_MSG_SCSI                       2
440 #define   EFI_DEV_MSG_FC                         3
441 #define   EFI_DEV_MSG_1394                       4
442 #define   EFI_DEV_MSG_USB                        5
443 #define   EFI_DEV_MSG_USB_CLASS                 15
444 #define   EFI_DEV_MSG_I20                        6
445 #define   EFI_DEV_MSG_MAC                       11
446 #define   EFI_DEV_MSG_IPV4                      12
447 #define   EFI_DEV_MSG_IPV6                      13
448 #define   EFI_DEV_MSG_INFINIBAND                 9
449 #define   EFI_DEV_MSG_UART                      14
450 #define   EFI_DEV_MSG_VENDOR                    10
451 #define EFI_DEV_MEDIA                   0x04
452 #define   EFI_DEV_MEDIA_HARD_DRIVE               1
453 #define   EFI_DEV_MEDIA_CDROM                    2
454 #define   EFI_DEV_MEDIA_VENDOR                   3
455 #define   EFI_DEV_MEDIA_FILE                     4
456 #define   EFI_DEV_MEDIA_PROTOCOL                 5
457 #define EFI_DEV_BIOS_BOOT               0x05
458 #define EFI_DEV_END_PATH                0x7F
459 #define EFI_DEV_END_PATH2               0xFF
460 #define   EFI_DEV_END_INSTANCE                  0x01
461 #define   EFI_DEV_END_ENTIRE                    0xFF
462 
463 struct efi_generic_dev_path {
464         u8 type;
465         u8 sub_type;
466         u16 length;
467 } __attribute ((packed));
468 
469 static inline void memrange_efi_to_native(u64 *addr, u64 *npages)
470 {
471         *npages = PFN_UP(*addr + (*npages<<EFI_PAGE_SHIFT)) - PFN_DOWN(*addr);
472         *addr &= PAGE_MASK;
473 }
474 
475 #if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
476 /*
477  * EFI Variable support.
478  *
479  * Different firmware drivers can expose their EFI-like variables using
480  * the following.
481  */
482 
483 struct efivar_operations {
484         efi_get_variable_t *get_variable;
485         efi_get_next_variable_t *get_next_variable;
486         efi_set_variable_t *set_variable;
487         efi_query_variable_store_t *query_variable_store;
488 };
489 
490 struct efivars {
491         /*
492          * ->lock protects two things:
493          * 1) ->list - adds, removals, reads, writes
494          * 2) ops.[gs]et_variable() calls.
495          * It must not be held when creating sysfs entries or calling kmalloc.
496          * ops.get_next_variable() is only called from register_efivars()
497          * or efivar_update_sysfs_entries(),
498          * which is protected by the BKL, so that path is safe.
499          */
500         spinlock_t lock;
501         struct list_head list;
502         struct kset *kset;
503         struct bin_attribute *new_var, *del_var;
504         const struct efivar_operations *ops;
505         struct efivar_entry *walk_entry;
506         struct pstore_info efi_pstore_info;
507 };
508 
509 int register_efivars(struct efivars *efivars,
510                      const struct efivar_operations *ops,
511                      struct kobject *parent_kobj);
512 void unregister_efivars(struct efivars *efivars);
513 
514 #endif /* CONFIG_EFI_VARS */
515 
516 #endif /* _LINUX_EFI_H */
517 

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