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