include/efi.h

   1 /*
   2  * Extensible Firmware Interface
   3  * Based on 'Extensible Firmware Interface Specification' version 0.9,
   4  * April 30, 1999
   5  *
   6  * Copyright (C) 1999 VA Linux Systems
   7  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   8  * Copyright (C) 1999, 2002-2003 Hewlett-Packard Co.
   9  *      David Mosberger-Tang <davidm@hpl.hp.com>
  10  *      Stephane Eranian <eranian@hpl.hp.com>
  11  *
  12  * From include/linux/efi.h in kernel 4.1 with some additions/subtractions
  13  */
  14
  15 #ifndef _EFI_H
  16 #define _EFI_H
  17
  18 #include <linux/linkage.h>
  19 #include <linux/string.h>
  20 #include <linux/types.h>
  21
  22 #ifdef CONFIG_EFI_STUB_64BIT
  23 /* EFI uses the Microsoft ABI which is not the default for GCC */
  24 #define EFIAPI __attribute__((ms_abi))
  25 #else
  26 #define EFIAPI asmlinkage
  27 #endif
  28
  29 struct efi_device_path;
  30
  31 typedef struct {
  32         u8 b[16];
  33 } efi_guid_t;
  34
  35 #define EFI_BITS_PER_LONG       BITS_PER_LONG
  36
  37 /*
  38  * With 64-bit EFI stub, EFI_BITS_PER_LONG has to be 64. EFI_STUB is set
  39  * in lib/efi/Makefile, when building the stub.
  40  */
  41 #if defined(CONFIG_EFI_STUB_64BIT) && defined(EFI_STUB)
  42 #undef EFI_BITS_PER_LONG
  43 #define EFI_BITS_PER_LONG       64
  44 #endif
  45
  46 /* Bit mask for EFI status code with error */
  47 #define EFI_ERROR_MASK (1UL << (EFI_BITS_PER_LONG - 1))
  48 /* Status codes returned by EFI protocols */
  49 #define EFI_SUCCESS                     0
  50 #define EFI_LOAD_ERROR                  (EFI_ERROR_MASK | 1)
  51 #define EFI_INVALID_PARAMETER           (EFI_ERROR_MASK | 2)
  52 #define EFI_UNSUPPORTED                 (EFI_ERROR_MASK | 3)
  53 #define EFI_BAD_BUFFER_SIZE             (EFI_ERROR_MASK | 4)
  54 #define EFI_BUFFER_TOO_SMALL            (EFI_ERROR_MASK | 5)
  55 #define EFI_NOT_READY                   (EFI_ERROR_MASK | 6)
  56 #define EFI_DEVICE_ERROR                (EFI_ERROR_MASK | 7)
  57 #define EFI_WRITE_PROTECTED             (EFI_ERROR_MASK | 8)
  58 #define EFI_OUT_OF_RESOURCES            (EFI_ERROR_MASK | 9)
  59 #define EFI_VOLUME_CORRUPTED            (EFI_ERROR_MASK | 10)
  60 #define EFI_VOLUME_FULL                 (EFI_ERROR_MASK | 11)
  61 #define EFI_NO_MEDIA                    (EFI_ERROR_MASK | 12)
  62 #define EFI_MEDIA_CHANGED               (EFI_ERROR_MASK | 13)
  63 #define EFI_NOT_FOUND                   (EFI_ERROR_MASK | 14)
  64 #define EFI_ACCESS_DENIED               (EFI_ERROR_MASK | 15)
  65 #define EFI_NO_RESPONSE                 (EFI_ERROR_MASK | 16)
  66 #define EFI_NO_MAPPING                  (EFI_ERROR_MASK | 17)
  67 #define EFI_TIMEOUT                     (EFI_ERROR_MASK | 18)
  68 #define EFI_NOT_STARTED                 (EFI_ERROR_MASK | 19)
  69 #define EFI_ALREADY_STARTED             (EFI_ERROR_MASK | 20)
  70 #define EFI_ABORTED                     (EFI_ERROR_MASK | 21)
  71 #define EFI_ICMP_ERROR                  (EFI_ERROR_MASK | 22)
  72 #define EFI_TFTP_ERROR                  (EFI_ERROR_MASK | 23)
  73 #define EFI_PROTOCOL_ERROR              (EFI_ERROR_MASK | 24)
  74 #define EFI_INCOMPATIBLE_VERSION        (EFI_ERROR_MASK | 25)
  75 #define EFI_SECURITY_VIOLATION          (EFI_ERROR_MASK | 26)
  76 #define EFI_CRC_ERROR                   (EFI_ERROR_MASK | 27)
  77 #define EFI_END_OF_MEDIA                (EFI_ERROR_MASK | 28)
  78 #define EFI_END_OF_FILE                 (EFI_ERROR_MASK | 31)
  79 #define EFI_INVALID_LANGUAGE            (EFI_ERROR_MASK | 32)
  80 #define EFI_COMPROMISED_DATA            (EFI_ERROR_MASK | 33)
  81 #define EFI_IP_ADDRESS_CONFLICT         (EFI_ERROR_MASK | 34)
  82 #define EFI_HTTP_ERROR                  (EFI_ERROR_MASK | 35)
  83
  84 typedef unsigned long efi_status_t;
  85 typedef u64 efi_physical_addr_t;
  86 typedef u64 efi_virtual_addr_t;
  87 typedef void *efi_handle_t;
  88
  89 #define EFI_GUID(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
  90         ((efi_guid_t) \
  91         {{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, \
  92                 ((a) >> 24) & 0xff, \
  93                 (b) & 0xff, ((b) >> 8) & 0xff, \
  94                 (c) & 0xff, ((c) >> 8) & 0xff, \
  95                 (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) } })
  96
  97 /* Generic EFI table header */
  98 struct efi_table_hdr {
  99         u64 signature;
 100         u32 revision;
 101         u32 headersize;
 102         u32 crc32;
 103         u32 reserved;
 104 };
 105
 106 /* Enumeration of memory types introduced in UEFI */
 107 enum efi_mem_type {
 108         EFI_RESERVED_MEMORY_TYPE,
 109         /*
 110          * The code portions of a loaded application.
 111          * (Note that UEFI OS loaders are UEFI applications.)
 112          */
 113         EFI_LOADER_CODE,
 114         /*
 115          * The data portions of a loaded application and
 116          * the default data allocation type used by an application
 117          * to allocate pool memory.
 118          */
 119         EFI_LOADER_DATA,
 120         /* The code portions of a loaded Boot Services Driver */
 121         EFI_BOOT_SERVICES_CODE,
 122         /*
 123          * The data portions of a loaded Boot Services Driver and
 124          * the default data allocation type used by a Boot Services
 125          * Driver to allocate pool memory.
 126          */
 127         EFI_BOOT_SERVICES_DATA,
 128         /* The code portions of a loaded Runtime Services Driver */
 129         EFI_RUNTIME_SERVICES_CODE,
 130         /*
 131          * The data portions of a loaded Runtime Services Driver and
 132          * the default data allocation type used by a Runtime Services
 133          * Driver to allocate pool memory.
 134          */
 135         EFI_RUNTIME_SERVICES_DATA,
 136         /* Free (unallocated) memory */
 137         EFI_CONVENTIONAL_MEMORY,
 138         /* Memory in which errors have been detected */
 139         EFI_UNUSABLE_MEMORY,
 140         /* Memory that holds the ACPI tables */
 141         EFI_ACPI_RECLAIM_MEMORY,
 142         /* Address space reserved for use by the firmware */
 143         EFI_ACPI_MEMORY_NVS,
 144         /*
 145          * Used by system firmware to request that a memory-mapped IO region
 146          * be mapped by the OS to a virtual address so it can be accessed by
 147          * EFI runtime services.
 148          */
 149         EFI_MMAP_IO,
 150         /*
 151          * System memory-mapped IO region that is used to translate
 152          * memory cycles to IO cycles by the processor.
 153          */
 154         EFI_MMAP_IO_PORT,
 155         /*
 156          * Address space reserved by the firmware for code that is
 157          * part of the processor.
 158          */
 159         EFI_PAL_CODE,
 160
 161         EFI_MAX_MEMORY_TYPE,
 162         EFI_TABLE_END,  /* For efi_build_mem_table() */
 163 };
 164
 165 /* Attribute values */
 166 enum {
 167         EFI_MEMORY_UC_SHIFT     = 0,    /* uncached */
 168         EFI_MEMORY_WC_SHIFT     = 1,    /* write-coalescing */
 169         EFI_MEMORY_WT_SHIFT     = 2,    /* write-through */
 170         EFI_MEMORY_WB_SHIFT     = 3,    /* write-back */
 171         EFI_MEMORY_UCE_SHIFT    = 4,    /* uncached, exported */
 172         EFI_MEMORY_WP_SHIFT     = 12,   /* write-protect */
 173         EFI_MEMORY_RP_SHIFT     = 13,   /* read-protect */
 174         EFI_MEMORY_XP_SHIFT     = 14,   /* execute-protect */
 175         EFI_MEMORY_RUNTIME_SHIFT = 63,  /* range requires runtime mapping */
 176
 177         EFI_MEMORY_RUNTIME = 1ULL << EFI_MEMORY_RUNTIME_SHIFT,
 178         EFI_MEM_DESC_VERSION    = 1,
 179 };
 180
 181 #define EFI_PAGE_SHIFT          12
 182 #define EFI_PAGE_SIZE           (1UL << EFI_PAGE_SHIFT)
 183 #define EFI_PAGE_MASK           (EFI_PAGE_SIZE - 1)
 184
 185 struct efi_mem_desc {
 186         u32 type;
 187         u32 reserved;
 188         efi_physical_addr_t physical_start;
 189         efi_virtual_addr_t virtual_start;
 190         u64 num_pages;
 191         u64 attribute;
 192 };
 193
 194 #define EFI_MEMORY_DESCRIPTOR_VERSION 1
 195
 196 /* Allocation types for calls to boottime->allocate_pages*/
 197 #define EFI_ALLOCATE_ANY_PAGES          0
 198 #define EFI_ALLOCATE_MAX_ADDRESS        1
 199 #define EFI_ALLOCATE_ADDRESS            2
 200 #define EFI_MAX_ALLOCATE_TYPE           3
 201
 202 /* Types and defines for Time Services */
 203 #define EFI_TIME_ADJUST_DAYLIGHT 0x1
 204 #define EFI_TIME_IN_DAYLIGHT     0x2
 205 #define EFI_UNSPECIFIED_TIMEZONE 0x07ff
 206
 207 struct efi_time {
 208         u16 year;
 209         u8 month;
 210         u8 day;
 211         u8 hour;
 212         u8 minute;
 213         u8 second;
 214         u8 pad1;
 215         u32 nanosecond;
 216         s16 timezone;
 217         u8 daylight;
 218         u8 pad2;
 219 };
 220
 221 struct efi_time_cap {
 222         u32 resolution;
 223         u32 accuracy;
 224         u8 sets_to_zero;
 225 };
 226
 227 enum efi_locate_search_type {
 228         all_handles,
 229         by_register_notify,
 230         by_protocol
 231 };
 232
 233 struct efi_open_protocol_info_entry {
 234         efi_handle_t agent_handle;
 235         efi_handle_t controller_handle;
 236         u32 attributes;
 237         u32 open_count;
 238 };
 239
 240 enum efi_entry_t {
 241         EFIET_END,      /* Signals this is the last (empty) entry */
 242         EFIET_MEMORY_MAP,
 243
 244         /* Number of entries */
 245         EFIET_MEMORY_COUNT,
 246 };
 247
 248 #define EFI_TABLE_VERSION       1
 249
 250 /**
 251  * struct efi_info_hdr - Header for the EFI info table
 252  *
 253  * @version:    EFI_TABLE_VERSION
 254  * @hdr_size:   Size of this struct in bytes
 255  * @total_size: Total size of this header plus following data
 256  * @spare:      Spare space for expansion
 257  */
 258 struct efi_info_hdr {
 259         u32 version;
 260         u32 hdr_size;
 261         u32 total_size;
 262         u32 spare[5];
 263 };
 264
 265 /**
 266  * struct efi_entry_hdr - Header for a table entry
 267  *
 268  * @type:       enum eft_entry_t
 269  * @size        size of entry bytes excluding header and padding
 270  * @addr:       address of this entry (0 if it follows the header )
 271  * @link:       size of entry including header and padding
 272  * @spare1:     Spare space for expansion
 273  * @spare2:     Spare space for expansion
 274  */
 275 struct efi_entry_hdr {
 276         u32 type;
 277         u32 size;
 278         u64 addr;
 279         u32 link;
 280         u32 spare1;
 281         u64 spare2;
 282 };
 283
 284 /**
 285  * struct efi_entry_memmap - a memory map table passed to U-Boot
 286  *
 287  * @version:    EFI's memory map table version
 288  * @desc_size:  EFI's size of each memory descriptor
 289  * @spare:      Spare space for expansion
 290  * @desc:       An array of descriptors, each @desc_size bytes apart
 291  */
 292 struct efi_entry_memmap {
 293         u32 version;
 294         u32 desc_size;
 295         u64 spare;
 296         struct efi_mem_desc desc[];
 297 };
 298
 299 static inline struct efi_mem_desc *efi_get_next_mem_desc(
 300                 struct efi_entry_memmap *map, struct efi_mem_desc *desc)
 301 {
 302         return (struct efi_mem_desc *)((ulong)desc + map->desc_size);
 303 }
 304
 305 struct efi_priv {
 306         efi_handle_t parent_image;
 307         struct efi_device_path *device_path;
 308         struct efi_system_table *sys_table;
 309         struct efi_boot_services *boot;
 310         struct efi_runtime_services *run;
 311         bool use_pool_for_malloc;
 312         unsigned long ram_base;
 313         unsigned int image_data_type;
 314         struct efi_info_hdr *info;
 315         unsigned int info_size;
 316         void *next_hdr;
 317 };
 318
 319 /* Base address of the EFI image */
 320 extern char image_base[];
 321
 322 /* Start and end of U-Boot image (for payload) */
 323 extern char _binary_u_boot_bin_start[], _binary_u_boot_bin_end[];
 324
 325 /**
 326  * efi_get_sys_table() - Get access to the main EFI system table
 327  *
 328  * @return pointer to EFI system table
 329  */
 330
 331 struct efi_system_table *efi_get_sys_table(void);
 332
 333 /**
 334  * efi_get_ram_base() - Find the base of RAM
 335  *
 336  * This is used when U-Boot is built as an EFI application.
 337  *
 338  * @return the base of RAM as known to U-Boot
 339  */
 340 unsigned long efi_get_ram_base(void);
 341
 342 /**
 343  * efi_init() - Set up ready for use of EFI boot services
 344  *
 345  * @priv:       Pointer to our private EFI structure to fill in
 346  * @banner:     Banner to display when starting
 347  * @image:      The image handle passed to efi_main()
 348  * @sys_table:  The EFI system table pointer passed to efi_main()
 349  */
 350 int efi_init(struct efi_priv *priv, const char *banner, efi_handle_t image,
 351              struct efi_system_table *sys_table);
 352
 353 /**
 354  * efi_malloc() - Allocate some memory from EFI
 355  *
 356  * @priv:       Pointer to private EFI structure
 357  * @size:       Number of bytes to allocate
 358  * @retp:       Return EFI status result
 359  * @return pointer to memory allocated, or NULL on error
 360  */
 361 void *efi_malloc(struct efi_priv *priv, int size, efi_status_t *retp);
 362
 363 /**
 364  * efi_free() - Free memory allocated from EFI
 365  *
 366  * @priv:       Pointer to private EFI structure
 367  * @ptr:        Pointer to memory to free
 368  */
 369 void efi_free(struct efi_priv *priv, void *ptr);
 370
 371 /**
 372  * efi_puts() - Write out a string to the EFI console
 373  *
 374  * @priv:       Pointer to private EFI structure
 375  * @str:        String to write (note this is a ASCII, not unicode)
 376  */
 377 void efi_puts(struct efi_priv *priv, const char *str);
 378
 379 /**
 380  * efi_putc() - Write out a character to the EFI console
 381  *
 382  * @priv:       Pointer to private EFI structure
 383  * @ch:         Character to write (note this is not unicode)
 384  */
 385 void efi_putc(struct efi_priv *priv, const char ch);
 386
 387 /**
 388  * efi_info_get() - get an entry from an EFI table
 389  *
 390  * @type:       Entry type to search for
 391  * @datap:      Returns pointer to entry data
 392  * @sizep:      Returns pointer to entry size
 393  * @return 0 if OK, -ENODATA if there is no table, -ENOENT if there is no entry
 394  * of the requested type, -EPROTONOSUPPORT if the table has the wrong version
 395  */
 396 int efi_info_get(enum efi_entry_t type, void **datap, int *sizep);
 397
 398 /**
 399  * efi_build_mem_table() - make a sorted copy of the memory table
 400  *
 401  * @map:        Pointer to EFI memory map table
 402  * @size:       Size of table in bytes
 403  * @skip_bs:    True to skip boot-time memory and merge it with conventional
 404  *              memory. This will significantly reduce the number of table
 405  *              entries.
 406  * @return pointer to the new table. It should be freed with free() by the
 407  *         caller
 408  */
 409 void *efi_build_mem_table(struct efi_entry_memmap *map, int size, bool skip_bs);
 410
 411 #endif /* _LINUX_EFI_H */