include/linux/efi.h

   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 typedef int (*efi_freemem_callback_t) (u64 start, u64 end, void *arg);
 113
 114 /*
 115  * Types and defines for Time Services
 116  */
 117 #define EFI_TIME_ADJUST_DAYLIGHT 0x1
 118 #define EFI_TIME_IN_DAYLIGHT     0x2
 119 #define EFI_UNSPECIFIED_TIMEZONE 0x07ff
 120
 121 typedef struct {
 122         u16 year;
 123         u8 month;
 124         u8 day;
 125         u8 hour;
 126         u8 minute;
 127         u8 second;
 128         u8 pad1;
 129         u32 nanosecond;
 130         s16 timezone;
 131         u8 daylight;
 132         u8 pad2;
 133 } efi_time_t;
 134
 135 typedef struct {
 136         u32 resolution;
 137         u32 accuracy;
 138         u8 sets_to_zero;
 139 } efi_time_cap_t;
 140
 141 /*
 142  * Types and defines for EFI ResetSystem
 143  */
 144 #define EFI_RESET_COLD 0
 145 #define EFI_RESET_WARM 1
 146 #define EFI_RESET_SHUTDOWN 2
 147
 148 /*
 149  * EFI Runtime Services table
 150  */
 151 #define EFI_RUNTIME_SERVICES_SIGNATURE ((u64)0x5652453544e5552ULL)
 152 #define EFI_RUNTIME_SERVICES_REVISION  0x00010000
 153
 154 typedef struct {
 155         efi_table_hdr_t hdr;
 156         unsigned long get_time;
 157         unsigned long set_time;
 158         unsigned long get_wakeup_time;
 159         unsigned long set_wakeup_time;
 160         unsigned long set_virtual_address_map;
 161         unsigned long convert_pointer;
 162         unsigned long get_variable;
 163         unsigned long get_next_variable;
 164         unsigned long set_variable;
 165         unsigned long get_next_high_mono_count;
 166         unsigned long reset_system;
 167         unsigned long update_capsule;
 168         unsigned long query_capsule_caps;
 169         unsigned long query_variable_info;
 170 } efi_runtime_services_t;
 171
 172 typedef efi_status_t efi_get_time_t (efi_time_t *tm, efi_time_cap_t *tc);
 173 typedef efi_status_t efi_set_time_t (efi_time_t *tm);
 174 typedef efi_status_t efi_get_wakeup_time_t (efi_bool_t *enabled, efi_bool_t *pending,
 175                                             efi_time_t *tm);
 176 typedef efi_status_t efi_set_wakeup_time_t (efi_bool_t enabled, efi_time_t *tm);
 177 typedef efi_status_t efi_get_variable_t (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,
 178                                          unsigned long *data_size, void *data);
 179 typedef efi_status_t efi_get_next_variable_t (unsigned long *name_size, efi_char16_t *name,
 180                                               efi_guid_t *vendor);
 181 typedef efi_status_t efi_set_variable_t (efi_char16_t *name, efi_guid_t *vendor,
 182                                          u32 attr, unsigned long data_size,
 183                                          void *data);
 184 typedef efi_status_t efi_get_next_high_mono_count_t (u32 *count);
 185 typedef void efi_reset_system_t (int reset_type, efi_status_t status,
 186                                  unsigned long data_size, efi_char16_t *data);
 187 typedef efi_status_t efi_set_virtual_address_map_t (unsigned long memory_map_size,
 188                                                 unsigned long descriptor_size,
 189                                                 u32 descriptor_version,
 190                                                 efi_memory_desc_t *virtual_map);
 191 typedef efi_status_t efi_query_variable_info_t(u32 attr,
 192                                                u64 *storage_space,
 193                                                u64 *remaining_space,
 194                                                u64 *max_variable_size);
 195 typedef efi_status_t efi_update_capsule_t(efi_capsule_header_t **capsules,
 196                                           unsigned long count,
 197                                           unsigned long sg_list);
 198 typedef efi_status_t efi_query_capsule_caps_t(efi_capsule_header_t **capsules,
 199                                               unsigned long count,
 200                                               u64 *max_size,
 201                                               int *reset_type);
 202
 203 /*
 204  *  EFI Configuration Table and GUID definitions
 205  */
 206 #define NULL_GUID \
 207     EFI_GUID(  0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 )
 208
 209 #define MPS_TABLE_GUID    \
 210     EFI_GUID(  0xeb9d2d2f, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
 211
 212 #define ACPI_TABLE_GUID    \
 213     EFI_GUID(  0xeb9d2d30, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
 214
 215 #define ACPI_20_TABLE_GUID    \
 216     EFI_GUID(  0x8868e871, 0xe4f1, 0x11d3, 0xbc, 0x22, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81 )
 217
 218 #define SMBIOS_TABLE_GUID    \
 219     EFI_GUID(  0xeb9d2d31, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
 220
 221 #define SAL_SYSTEM_TABLE_GUID    \
 222     EFI_GUID(  0xeb9d2d32, 0x2d88, 0x11d3, 0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d )
 223
 224 #define HCDP_TABLE_GUID \
 225     EFI_GUID(  0xf951938d, 0x620b, 0x42ef, 0x82, 0x79, 0xa8, 0x4b, 0x79, 0x61, 0x78, 0x98 )
 226
 227 #define UGA_IO_PROTOCOL_GUID \
 228     EFI_GUID(  0x61a4d49e, 0x6f68, 0x4f1b, 0xb9, 0x22, 0xa8, 0x6e, 0xed, 0xb, 0x7, 0xa2 )
 229
 230 #define EFI_GLOBAL_VARIABLE_GUID \
 231     EFI_GUID(  0x8be4df61, 0x93ca, 0x11d2, 0xaa, 0x0d, 0x00, 0xe0, 0x98, 0x03, 0x2b, 0x8c )
 232
 233 #define UV_SYSTEM_TABLE_GUID \
 234     EFI_GUID(  0x3b13a7d4, 0x633e, 0x11dd, 0x93, 0xec, 0xda, 0x25, 0x56, 0xd8, 0x95, 0x93 )
 235
 236 #define LINUX_EFI_CRASH_GUID \
 237     EFI_GUID(  0xcfc8fc79, 0xbe2e, 0x4ddc, 0x97, 0xf0, 0x9f, 0x98, 0xbf, 0xe2, 0x98, 0xa0 )
 238
 239 typedef struct {
 240         efi_guid_t guid;
 241         unsigned long table;
 242 } efi_config_table_t;
 243
 244 #define EFI_SYSTEM_TABLE_SIGNATURE ((u64)0x5453595320494249ULL)
 245
 246 #define EFI_2_30_SYSTEM_TABLE_REVISION  ((2 << 16) | (30))
 247 #define EFI_2_20_SYSTEM_TABLE_REVISION  ((2 << 16) | (20))
 248 #define EFI_2_10_SYSTEM_TABLE_REVISION  ((2 << 16) | (10))
 249 #define EFI_2_00_SYSTEM_TABLE_REVISION  ((2 << 16) | (00))
 250 #define EFI_1_10_SYSTEM_TABLE_REVISION  ((1 << 16) | (10))
 251 #define EFI_1_02_SYSTEM_TABLE_REVISION  ((1 << 16) | (02))
 252
 253 typedef struct {
 254         efi_table_hdr_t hdr;
 255         unsigned long fw_vendor;        /* physical addr of CHAR16 vendor string */
 256         u32 fw_revision;
 257         unsigned long con_in_handle;
 258         unsigned long con_in;
 259         unsigned long con_out_handle;
 260         unsigned long con_out;
 261         unsigned long stderr_handle;
 262         unsigned long stderr;
 263         efi_runtime_services_t *runtime;
 264         unsigned long boottime;
 265         unsigned long nr_tables;
 266         unsigned long tables;
 267 } efi_system_table_t;
 268
 269 struct efi_memory_map {
 270         void *phys_map;
 271         void *map;
 272         void *map_end;
 273         int nr_map;
 274         unsigned long desc_version;
 275         unsigned long desc_size;
 276 };
 277
 278 #define EFI_INVALID_TABLE_ADDR          (~0UL)
 279
 280 /*
 281  * All runtime access to EFI goes through this structure:
 282  */
 283 extern struct efi {
 284         efi_system_table_t *systab;     /* EFI system table */
 285         unsigned int runtime_version;   /* Runtime services version */
 286         unsigned long mps;              /* MPS table */
 287         unsigned long acpi;             /* ACPI table  (IA64 ext 0.71) */
 288         unsigned long acpi20;           /* ACPI table  (ACPI 2.0) */
 289         unsigned long smbios;           /* SM BIOS table */
 290         unsigned long sal_systab;       /* SAL system table */
 291         unsigned long boot_info;        /* boot info table */
 292         unsigned long hcdp;             /* HCDP table */
 293         unsigned long uga;              /* UGA table */
 294         unsigned long uv_systab;        /* UV system table */
 295         efi_get_time_t *get_time;
 296         efi_set_time_t *set_time;
 297         efi_get_wakeup_time_t *get_wakeup_time;
 298         efi_set_wakeup_time_t *set_wakeup_time;
 299         efi_get_variable_t *get_variable;
 300         efi_get_next_variable_t *get_next_variable;
 301         efi_set_variable_t *set_variable;
 302         efi_query_variable_info_t *query_variable_info;
 303         efi_update_capsule_t *update_capsule;
 304         efi_query_capsule_caps_t *query_capsule_caps;
 305         efi_get_next_high_mono_count_t *get_next_high_mono_count;
 306         efi_reset_system_t *reset_system;
 307         efi_set_virtual_address_map_t *set_virtual_address_map;
 308 } efi;
 309
 310 static inline int
 311 efi_guidcmp (efi_guid_t left, efi_guid_t right)
 312 {
 313         return memcmp(&left, &right, sizeof (efi_guid_t));
 314 }
 315
 316 static inline char *
 317 efi_guid_unparse(efi_guid_t *guid, char *out)
 318 {
 319         sprintf(out, "%pUl", guid->b);
 320         return out;
 321 }
 322
 323 extern void efi_init (void);
 324 extern void *efi_get_pal_addr (void);
 325 extern void efi_map_pal_code (void);
 326 extern void efi_memmap_walk (efi_freemem_callback_t callback, void *arg);
 327 extern void efi_gettimeofday (struct timespec *ts);
 328 extern void efi_enter_virtual_mode (void);      /* switch EFI to virtual mode, if possible */
 329 extern u64 efi_get_iobase (void);
 330 extern u32 efi_mem_type (unsigned long phys_addr);
 331 extern u64 efi_mem_attributes (unsigned long phys_addr);
 332 extern u64 efi_mem_attribute (unsigned long phys_addr, unsigned long size);
 333 extern int __init efi_uart_console_only (void);
 334 extern void efi_initialize_iomem_resources(struct resource *code_resource,
 335                 struct resource *data_resource, struct resource *bss_resource);
 336 extern unsigned long efi_get_time(void);
 337 extern int efi_set_rtc_mmss(unsigned long nowtime);
 338 extern void efi_reserve_boot_services(void);
 339 extern struct efi_memory_map memmap;
 340
 341 /**
 342  * efi_range_is_wc - check the WC bit on an address range
 343  * @start: starting kvirt address
 344  * @len: length of range
 345  *
 346  * Consult the EFI memory map and make sure it's ok to set this range WC.
 347  * Returns true or false.
 348  */
 349 static inline int efi_range_is_wc(unsigned long start, unsigned long len)
 350 {
 351         unsigned long i;
 352
 353         for (i = 0; i < len; i += (1UL << EFI_PAGE_SHIFT)) {
 354                 unsigned long paddr = __pa(start + i);
 355                 if (!(efi_mem_attributes(paddr) & EFI_MEMORY_WC))
 356                         return 0;
 357         }
 358         /* The range checked out */
 359         return 1;
 360 }
 361
 362 #ifdef CONFIG_EFI_PCDP
 363 extern int __init efi_setup_pcdp_console(char *);
 364 #endif
 365
 366 /*
 367  * We play games with efi_enabled so that the compiler will, if possible, remove
 368  * EFI-related code altogether.
 369  */
 370 #ifdef CONFIG_EFI
 371 # ifdef CONFIG_X86
 372    extern int efi_enabled;
 373 # else
 374 #  define efi_enabled 1
 375 # endif
 376 #else
 377 # define efi_enabled 0
 378 #endif
 379
 380 /*
 381  * Variable Attributes
 382  */
 383 #define EFI_VARIABLE_NON_VOLATILE       0x0000000000000001
 384 #define EFI_VARIABLE_BOOTSERVICE_ACCESS 0x0000000000000002
 385 #define EFI_VARIABLE_RUNTIME_ACCESS     0x0000000000000004
 386
 387 /*
 388  * EFI Device Path information
 389  */
 390 #define EFI_DEV_HW                      0x01
 391 #define  EFI_DEV_PCI                             1
 392 #define  EFI_DEV_PCCARD                          2
 393 #define  EFI_DEV_MEM_MAPPED                      3
 394 #define  EFI_DEV_VENDOR                          4
 395 #define  EFI_DEV_CONTROLLER                      5
 396 #define EFI_DEV_ACPI                    0x02
 397 #define   EFI_DEV_BASIC_ACPI                     1
 398 #define   EFI_DEV_EXPANDED_ACPI                  2
 399 #define EFI_DEV_MSG                     0x03
 400 #define   EFI_DEV_MSG_ATAPI                      1
 401 #define   EFI_DEV_MSG_SCSI                       2
 402 #define   EFI_DEV_MSG_FC                         3
 403 #define   EFI_DEV_MSG_1394                       4
 404 #define   EFI_DEV_MSG_USB                        5
 405 #define   EFI_DEV_MSG_USB_CLASS                 15
 406 #define   EFI_DEV_MSG_I20                        6
 407 #define   EFI_DEV_MSG_MAC                       11
 408 #define   EFI_DEV_MSG_IPV4                      12
 409 #define   EFI_DEV_MSG_IPV6                      13
 410 #define   EFI_DEV_MSG_INFINIBAND                 9
 411 #define   EFI_DEV_MSG_UART                      14
 412 #define   EFI_DEV_MSG_VENDOR                    10
 413 #define EFI_DEV_MEDIA                   0x04
 414 #define   EFI_DEV_MEDIA_HARD_DRIVE               1
 415 #define   EFI_DEV_MEDIA_CDROM                    2
 416 #define   EFI_DEV_MEDIA_VENDOR                   3
 417 #define   EFI_DEV_MEDIA_FILE                     4
 418 #define   EFI_DEV_MEDIA_PROTOCOL                 5
 419 #define EFI_DEV_BIOS_BOOT               0x05
 420 #define EFI_DEV_END_PATH                0x7F
 421 #define EFI_DEV_END_PATH2               0xFF
 422 #define   EFI_DEV_END_INSTANCE                  0x01
 423 #define   EFI_DEV_END_ENTIRE                    0xFF
 424
 425 struct efi_generic_dev_path {
 426         u8 type;
 427         u8 sub_type;
 428         u16 length;
 429 } __attribute ((packed));
 430
 431 static inline void memrange_efi_to_native(u64 *addr, u64 *npages)
 432 {
 433         *npages = PFN_UP(*addr + (*npages<<EFI_PAGE_SHIFT)) - PFN_DOWN(*addr);
 434         *addr &= PAGE_MASK;
 435 }
 436
 437 #if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
 438 /*
 439  * EFI Variable support.
 440  *
 441  * Different firmware drivers can expose their EFI-like variables using
 442  * the following.
 443  */
 444
 445 struct efivar_operations {
 446         efi_get_variable_t *get_variable;
 447         efi_get_next_variable_t *get_next_variable;
 448         efi_set_variable_t *set_variable;
 449 };
 450
 451 struct efivars {
 452         /*
 453          * ->lock protects two things:
 454          * 1) ->list - adds, removals, reads, writes
 455          * 2) ops.[gs]et_variable() calls.
 456          * It must not be held when creating sysfs entries or calling kmalloc.
 457          * ops.get_next_variable() is only called from register_efivars(),
 458          * which is protected by the BKL, so that path is safe.
 459          */
 460         spinlock_t lock;
 461         struct list_head list;
 462         struct kset *kset;
 463         struct bin_attribute *new_var, *del_var;
 464         const struct efivar_operations *ops;
 465         struct efivar_entry *walk_entry;
 466         struct pstore_info efi_pstore_info;
 467 };
 468
 469 int register_efivars(struct efivars *efivars,
 470                      const struct efivar_operations *ops,
 471                      struct kobject *parent_kobj);
 472 void unregister_efivars(struct efivars *efivars);
 473
 474 #endif /* CONFIG_EFI_VARS */
 475
 476 #endif /* _LINUX_EFI_H */