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