include/efi.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Extensible Firmware Interface
   4  * Based on 'Extensible Firmware Interface Specification' version 0.9,
   5  * April 30, 1999
   6  *
   7  * Copyright (C) 1999 VA Linux Systems
   8  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   9  * Copyright (C) 1999, 2002-2003 Hewlett-Packard Co.
  10  *      David Mosberger-Tang <davidm@hpl.hp.com>
  11  *      Stephane Eranian <eranian@hpl.hp.com>
  12  *
  13  * From include/linux/efi.h in kernel 4.1 with some additions/subtractions
  14  */
  15
  16 #ifndef _EFI_H
  17 #define _EFI_H
  18
  19 #include <linux/linkage.h>
  20 #include <linux/string.h>
  21 #include <linux/types.h>
  22
  23 /*
  24  * EFI on x86_64 uses the Microsoft ABI which is not the default for GCC.
  25  *
  26  * There are two scenarios for EFI on x86_64: building a 64-bit EFI stub
  27  * codes (CONFIG_EFI_STUB_64BIT) and building a 64-bit U-Boot (CONFIG_X86_64).
  28  * Either needs to be properly built with the '-m64' compiler flag, and hence
  29  * it is enough to only check the compiler provided define __x86_64__ here.
  30  */
  31 #ifdef __x86_64__
  32 #define EFIAPI __attribute__((ms_abi))
  33 #define efi_va_list __builtin_ms_va_list
  34 #define efi_va_start __builtin_ms_va_start
  35 #define efi_va_arg __builtin_va_arg
  36 #define efi_va_end __builtin_ms_va_end
  37 #else
  38 #define EFIAPI asmlinkage
  39 #define efi_va_list va_list
  40 #define efi_va_start va_start
  41 #define efi_va_arg va_arg
  42 #define efi_va_end va_end
  43 #endif /* __x86_64__ */
  44
  45 #define EFI32_LOADER_SIGNATURE  "EL32"
  46 #define EFI64_LOADER_SIGNATURE  "EL64"
  47
  48 struct efi_device_path;
  49
  50 typedef struct {
  51         u8 b[16];
  52 } efi_guid_t __attribute__((aligned(8)));
  53
  54 #define EFI_BITS_PER_LONG       (sizeof(long) * 8)
  55
  56 /* Bit mask for EFI status code with error */
  57 #define EFI_ERROR_MASK (1UL << (EFI_BITS_PER_LONG - 1))
  58 /* Status codes returned by EFI protocols */
  59 #define EFI_SUCCESS                     0
  60 #define EFI_LOAD_ERROR                  (EFI_ERROR_MASK | 1)
  61 #define EFI_INVALID_PARAMETER           (EFI_ERROR_MASK | 2)
  62 #define EFI_UNSUPPORTED                 (EFI_ERROR_MASK | 3)
  63 #define EFI_BAD_BUFFER_SIZE             (EFI_ERROR_MASK | 4)
  64 #define EFI_BUFFER_TOO_SMALL            (EFI_ERROR_MASK | 5)
  65 #define EFI_NOT_READY                   (EFI_ERROR_MASK | 6)
  66 #define EFI_DEVICE_ERROR                (EFI_ERROR_MASK | 7)
  67 #define EFI_WRITE_PROTECTED             (EFI_ERROR_MASK | 8)
  68 #define EFI_OUT_OF_RESOURCES            (EFI_ERROR_MASK | 9)
  69 #define EFI_VOLUME_CORRUPTED            (EFI_ERROR_MASK | 10)
  70 #define EFI_VOLUME_FULL                 (EFI_ERROR_MASK | 11)
  71 #define EFI_NO_MEDIA                    (EFI_ERROR_MASK | 12)
  72 #define EFI_MEDIA_CHANGED               (EFI_ERROR_MASK | 13)
  73 #define EFI_NOT_FOUND                   (EFI_ERROR_MASK | 14)
  74 #define EFI_ACCESS_DENIED               (EFI_ERROR_MASK | 15)
  75 #define EFI_NO_RESPONSE                 (EFI_ERROR_MASK | 16)
  76 #define EFI_NO_MAPPING                  (EFI_ERROR_MASK | 17)
  77 #define EFI_TIMEOUT                     (EFI_ERROR_MASK | 18)
  78 #define EFI_NOT_STARTED                 (EFI_ERROR_MASK | 19)
  79 #define EFI_ALREADY_STARTED             (EFI_ERROR_MASK | 20)
  80 #define EFI_ABORTED                     (EFI_ERROR_MASK | 21)
  81 #define EFI_ICMP_ERROR                  (EFI_ERROR_MASK | 22)
  82 #define EFI_TFTP_ERROR                  (EFI_ERROR_MASK | 23)
  83 #define EFI_PROTOCOL_ERROR              (EFI_ERROR_MASK | 24)
  84 #define EFI_INCOMPATIBLE_VERSION        (EFI_ERROR_MASK | 25)
  85 #define EFI_SECURITY_VIOLATION          (EFI_ERROR_MASK | 26)
  86 #define EFI_CRC_ERROR                   (EFI_ERROR_MASK | 27)
  87 #define EFI_END_OF_MEDIA                (EFI_ERROR_MASK | 28)
  88 #define EFI_END_OF_FILE                 (EFI_ERROR_MASK | 31)
  89 #define EFI_INVALID_LANGUAGE            (EFI_ERROR_MASK | 32)
  90 #define EFI_COMPROMISED_DATA            (EFI_ERROR_MASK | 33)
  91 #define EFI_IP_ADDRESS_CONFLICT         (EFI_ERROR_MASK | 34)
  92 #define EFI_HTTP_ERROR                  (EFI_ERROR_MASK | 35)
  93
  94 #define EFI_WARN_UNKNOWN_GLYPH          1
  95 #define EFI_WARN_DELETE_FAILURE         2
  96 #define EFI_WARN_WRITE_FAILURE          3
  97 #define EFI_WARN_BUFFER_TOO_SMALL       4
  98 #define EFI_WARN_STALE_DATA             5
  99 #define EFI_WARN_FILE_SYSTEM            6
 100 #define EFI_WARN_RESET_REQUIRED         7
 101
 102 typedef unsigned long efi_status_t;
 103 typedef u64 efi_physical_addr_t;
 104 typedef u64 efi_virtual_addr_t;
 105 typedef struct efi_object *efi_handle_t;
 106
 107 #define EFI_GUID(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
 108         {{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, \
 109                 ((a) >> 24) & 0xff, \
 110                 (b) & 0xff, ((b) >> 8) & 0xff, \
 111                 (c) & 0xff, ((c) >> 8) & 0xff, \
 112                 (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) } }
 113
 114 /* Generic EFI table header */
 115 struct efi_table_hdr {
 116         u64 signature;
 117         u32 revision;
 118         u32 headersize;
 119         u32 crc32;
 120         u32 reserved;
 121 };
 122
 123 /* Enumeration of memory types introduced in UEFI */
 124 enum efi_mem_type {
 125         EFI_RESERVED_MEMORY_TYPE,
 126         /*
 127          * The code portions of a loaded application.
 128          * (Note that UEFI OS loaders are UEFI applications.)
 129          */
 130         EFI_LOADER_CODE,
 131         /*
 132          * The data portions of a loaded application and
 133          * the default data allocation type used by an application
 134          * to allocate pool memory.
 135          */
 136         EFI_LOADER_DATA,
 137         /* The code portions of a loaded Boot Services Driver */
 138         EFI_BOOT_SERVICES_CODE,
 139         /*
 140          * The data portions of a loaded Boot Services Driver and
 141          * the default data allocation type used by a Boot Services
 142          * Driver to allocate pool memory.
 143          */
 144         EFI_BOOT_SERVICES_DATA,
 145         /* The code portions of a loaded Runtime Services Driver */
 146         EFI_RUNTIME_SERVICES_CODE,
 147         /*
 148          * The data portions of a loaded Runtime Services Driver and
 149          * the default data allocation type used by a Runtime Services
 150          * Driver to allocate pool memory.
 151          */
 152         EFI_RUNTIME_SERVICES_DATA,
 153         /* Free (unallocated) memory */
 154         EFI_CONVENTIONAL_MEMORY,
 155         /* Memory in which errors have been detected */
 156         EFI_UNUSABLE_MEMORY,
 157         /* Memory that holds the ACPI tables */
 158         EFI_ACPI_RECLAIM_MEMORY,
 159         /* Address space reserved for use by the firmware */
 160         EFI_ACPI_MEMORY_NVS,
 161         /*
 162          * Used by system firmware to request that a memory-mapped IO region
 163          * be mapped by the OS to a virtual address so it can be accessed by
 164          * EFI runtime services.
 165          */
 166         EFI_MMAP_IO,
 167         /*
 168          * System memory-mapped IO region that is used to translate
 169          * memory cycles to IO cycles by the processor.
 170          */
 171         EFI_MMAP_IO_PORT,
 172         /*
 173          * Address space reserved by the firmware for code that is
 174          * part of the processor.
 175          */
 176         EFI_PAL_CODE,
 177         /*
 178          * Non-volatile memory.
 179          */
 180         EFI_PERSISTENT_MEMORY_TYPE,
 181
 182         EFI_MAX_MEMORY_TYPE,
 183         EFI_TABLE_END,  /* For efi_build_mem_table() */
 184 };
 185
 186 /* Attribute values */
 187 #define EFI_MEMORY_UC           ((u64)0x0000000000000001ULL)    /* uncached */
 188 #define EFI_MEMORY_WC           ((u64)0x0000000000000002ULL)    /* write-coalescing */
 189 #define EFI_MEMORY_WT           ((u64)0x0000000000000004ULL)    /* write-through */
 190 #define EFI_MEMORY_WB           ((u64)0x0000000000000008ULL)    /* write-back */
 191 #define EFI_MEMORY_UCE          ((u64)0x0000000000000010ULL)    /* uncached, exported */
 192 #define EFI_MEMORY_WP           ((u64)0x0000000000001000ULL)    /* write-protect */
 193 #define EFI_MEMORY_RP           ((u64)0x0000000000002000ULL)    /* read-protect */
 194 #define EFI_MEMORY_XP           ((u64)0x0000000000004000ULL)    /* execute-protect */
 195 #define EFI_MEMORY_NV           ((u64)0x0000000000008000ULL)    /* non-volatile */
 196 #define EFI_MEMORY_MORE_RELIABLE \
 197                                 ((u64)0x0000000000010000ULL)    /* higher reliability */
 198 #define EFI_MEMORY_RO           ((u64)0x0000000000020000ULL)    /* read-only */
 199 #define EFI_MEMORY_RUNTIME      ((u64)0x8000000000000000ULL)    /* range requires runtime mapping */
 200 #define EFI_MEM_DESC_VERSION    1
 201
 202 #define EFI_PAGE_SHIFT          12
 203 #define EFI_PAGE_SIZE           (1ULL << EFI_PAGE_SHIFT)
 204 #define EFI_PAGE_MASK           (EFI_PAGE_SIZE - 1)
 205
 206 struct efi_mem_desc {
 207         u32 type;
 208         u32 reserved;
 209         efi_physical_addr_t physical_start;
 210         efi_virtual_addr_t virtual_start;
 211         u64 num_pages;
 212         u64 attribute;
 213 };
 214
 215 #define EFI_MEMORY_DESCRIPTOR_VERSION 1
 216
 217 /* Allocation types for calls to boottime->allocate_pages*/
 218 #define EFI_ALLOCATE_ANY_PAGES          0
 219 #define EFI_ALLOCATE_MAX_ADDRESS        1
 220 #define EFI_ALLOCATE_ADDRESS            2
 221 #define EFI_MAX_ALLOCATE_TYPE           3
 222
 223 /* Types and defines for Time Services */
 224 #define EFI_TIME_ADJUST_DAYLIGHT 0x1
 225 #define EFI_TIME_IN_DAYLIGHT     0x2
 226 #define EFI_UNSPECIFIED_TIMEZONE 0x07ff
 227
 228 struct efi_time {
 229         u16 year;
 230         u8 month;
 231         u8 day;
 232         u8 hour;
 233         u8 minute;
 234         u8 second;
 235         u8 pad1;
 236         u32 nanosecond;
 237         s16 timezone;
 238         u8 daylight;
 239         u8 pad2;
 240 };
 241
 242 struct efi_time_cap {
 243         u32 resolution;
 244         u32 accuracy;
 245         u8 sets_to_zero;
 246 };
 247
 248 enum efi_locate_search_type {
 249         ALL_HANDLES,
 250         BY_REGISTER_NOTIFY,
 251         BY_PROTOCOL
 252 };
 253
 254 struct efi_open_protocol_info_entry {
 255         efi_handle_t agent_handle;
 256         efi_handle_t controller_handle;
 257         u32 attributes;
 258         u32 open_count;
 259 };
 260
 261 enum efi_entry_t {
 262         EFIET_END,      /* Signals this is the last (empty) entry */
 263         EFIET_MEMORY_MAP,
 264         EFIET_GOP_MODE,
 265         EFIET_SYS_TABLE,
 266
 267         /* Number of entries */
 268         EFIET_MEMORY_COUNT,
 269 };
 270
 271 #define EFI_TABLE_VERSION       1
 272
 273 /**
 274  * struct efi_info_hdr - Header for the EFI info table
 275  *
 276  * @version:    EFI_TABLE_VERSION
 277  * @hdr_size:   Size of this struct in bytes
 278  * @total_size: Total size of this header plus following data
 279  * @spare:      Spare space for expansion
 280  */
 281 struct efi_info_hdr {
 282         u32 version;
 283         u32 hdr_size;
 284         u32 total_size;
 285         u32 spare[5];
 286 };
 287
 288 /**
 289  * struct efi_entry_hdr - Header for a table entry
 290  *
 291  * @type:       enum eft_entry_t
 292  * @size        size of entry bytes excluding header and padding
 293  * @addr:       address of this entry (0 if it follows the header )
 294  * @link:       size of entry including header and padding
 295  * @spare1:     Spare space for expansion
 296  * @spare2:     Spare space for expansion
 297  */
 298 struct efi_entry_hdr {
 299         u32 type;
 300         u32 size;
 301         u64 addr;
 302         u32 link;
 303         u32 spare1;
 304         u64 spare2;
 305 };
 306
 307 /**
 308  * struct efi_entry_memmap - a memory map table passed to U-Boot
 309  *
 310  * @version:    EFI's memory map table version
 311  * @desc_size:  EFI's size of each memory descriptor
 312  * @spare:      Spare space for expansion
 313  * @desc:       An array of descriptors, each @desc_size bytes apart
 314  */
 315 struct efi_entry_memmap {
 316         u32 version;
 317         u32 desc_size;
 318         u64 spare;
 319         struct efi_mem_desc desc[];
 320 };
 321
 322 /**
 323  * struct efi_entry_gopmode - a GOP mode table passed to U-Boot
 324  *
 325  * @fb_base:    EFI's framebuffer base address
 326  * @fb_size:    EFI's framebuffer size
 327  * @info_size:  GOP mode info structure size
 328  * @info:       Start address of the GOP mode info structure
 329  */
 330 struct efi_entry_gopmode {
 331         efi_physical_addr_t fb_base;
 332         /*
 333          * Not like the ones in 'struct efi_gop_mode' which are 'unsigned
 334          * long', @fb_size and @info_size have to be 'u64' here. As the EFI
 335          * stub codes may have different bit size from the U-Boot payload,
 336          * using 'long' will cause mismatch between the producer (stub) and
 337          * the consumer (payload).
 338          */
 339         u64 fb_size;
 340         u64 info_size;
 341         /*
 342          * We cannot directly use 'struct efi_gop_mode_info info[]' here as
 343          * it causes compiler to complain: array type has incomplete element
 344          * type 'struct efi_gop_mode_info'.
 345          */
 346         struct /* efi_gop_mode_info */ {
 347                 u32 version;
 348                 u32 width;
 349                 u32 height;
 350                 u32 pixel_format;
 351                 u32 pixel_bitmask[4];
 352                 u32 pixels_per_scanline;
 353         } info[];
 354 };
 355
 356 /**
 357  * struct efi_entry_systable - system table passed to U-Boot
 358  *
 359  * @sys_table:  EFI system table address
 360  */
 361 struct efi_entry_systable {
 362         efi_physical_addr_t sys_table;
 363 };
 364
 365 static inline struct efi_mem_desc *efi_get_next_mem_desc(
 366                 struct efi_entry_memmap *map, struct efi_mem_desc *desc)
 367 {
 368         return (struct efi_mem_desc *)((ulong)desc + map->desc_size);
 369 }
 370
 371 struct efi_priv {
 372         efi_handle_t parent_image;
 373         struct efi_device_path *device_path;
 374         struct efi_system_table *sys_table;
 375         struct efi_boot_services *boot;
 376         struct efi_runtime_services *run;
 377         bool use_pool_for_malloc;
 378         unsigned long ram_base;
 379         unsigned int image_data_type;
 380         struct efi_info_hdr *info;
 381         unsigned int info_size;
 382         void *next_hdr;
 383 };
 384
 385 /* Base address of the EFI image */
 386 extern char image_base[];
 387
 388 /* Start and end of U-Boot image (for payload) */
 389 extern char _binary_u_boot_bin_start[], _binary_u_boot_bin_end[];
 390
 391 /*
 392  * Variable Attributes
 393  */
 394 #define EFI_VARIABLE_NON_VOLATILE       0x0000000000000001
 395 #define EFI_VARIABLE_BOOTSERVICE_ACCESS 0x0000000000000002
 396 #define EFI_VARIABLE_RUNTIME_ACCESS     0x0000000000000004
 397 #define EFI_VARIABLE_HARDWARE_ERROR_RECORD 0x0000000000000008
 398 #define EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS 0x0000000000000010
 399 #define EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS 0x0000000000000020
 400 #define EFI_VARIABLE_APPEND_WRITE       0x0000000000000040
 401
 402 #define EFI_VARIABLE_MASK       (EFI_VARIABLE_NON_VOLATILE | \
 403                                 EFI_VARIABLE_BOOTSERVICE_ACCESS | \
 404                                 EFI_VARIABLE_RUNTIME_ACCESS | \
 405                                 EFI_VARIABLE_HARDWARE_ERROR_RECORD | \
 406                                 EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS | \
 407                                 EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS | \
 408                                 EFI_VARIABLE_APPEND_WRITE)
 409
 410 /**
 411  * efi_get_sys_table() - Get access to the main EFI system table
 412  *
 413  * @return pointer to EFI system table
 414  */
 415
 416 struct efi_system_table *efi_get_sys_table(void);
 417
 418 /**
 419  * efi_get_ram_base() - Find the base of RAM
 420  *
 421  * This is used when U-Boot is built as an EFI application.
 422  *
 423  * @return the base of RAM as known to U-Boot
 424  */
 425 unsigned long efi_get_ram_base(void);
 426
 427 /**
 428  * efi_init() - Set up ready for use of EFI boot services
 429  *
 430  * @priv:       Pointer to our private EFI structure to fill in
 431  * @banner:     Banner to display when starting
 432  * @image:      The image handle passed to efi_main()
 433  * @sys_table:  The EFI system table pointer passed to efi_main()
 434  */
 435 int efi_init(struct efi_priv *priv, const char *banner, efi_handle_t image,
 436              struct efi_system_table *sys_table);
 437
 438 /**
 439  * efi_malloc() - Allocate some memory from EFI
 440  *
 441  * @priv:       Pointer to private EFI structure
 442  * @size:       Number of bytes to allocate
 443  * @retp:       Return EFI status result
 444  * @return pointer to memory allocated, or NULL on error
 445  */
 446 void *efi_malloc(struct efi_priv *priv, int size, efi_status_t *retp);
 447
 448 /**
 449  * efi_free() - Free memory allocated from EFI
 450  *
 451  * @priv:       Pointer to private EFI structure
 452  * @ptr:        Pointer to memory to free
 453  */
 454 void efi_free(struct efi_priv *priv, void *ptr);
 455
 456 /**
 457  * efi_puts() - Write out a string to the EFI console
 458  *
 459  * @priv:       Pointer to private EFI structure
 460  * @str:        String to write (note this is a ASCII, not unicode)
 461  */
 462 void efi_puts(struct efi_priv *priv, const char *str);
 463
 464 /**
 465  * efi_putc() - Write out a character to the EFI console
 466  *
 467  * @priv:       Pointer to private EFI structure
 468  * @ch:         Character to write (note this is not unicode)
 469  */
 470 void efi_putc(struct efi_priv *priv, const char ch);
 471
 472 /**
 473  * efi_info_get() - get an entry from an EFI table
 474  *
 475  * @type:       Entry type to search for
 476  * @datap:      Returns pointer to entry data
 477  * @sizep:      Returns pointer to entry size
 478  * @return 0 if OK, -ENODATA if there is no table, -ENOENT if there is no entry
 479  * of the requested type, -EPROTONOSUPPORT if the table has the wrong version
 480  */
 481 int efi_info_get(enum efi_entry_t type, void **datap, int *sizep);
 482
 483 /**
 484  * efi_build_mem_table() - make a sorted copy of the memory table
 485  *
 486  * @map:        Pointer to EFI memory map table
 487  * @size:       Size of table in bytes
 488  * @skip_bs:    True to skip boot-time memory and merge it with conventional
 489  *              memory. This will significantly reduce the number of table
 490  *              entries.
 491  * @return pointer to the new table. It should be freed with free() by the
 492  *         caller
 493  */
 494 void *efi_build_mem_table(struct efi_entry_memmap *map, int size, bool skip_bs);
 495
 496 #endif /* _LINUX_EFI_H */