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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
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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
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28struct 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
43typedef unsigned long efi_status_t;
44typedef u64 efi_physical_addr_t;
45typedef u64 efi_virtual_addr_t;
46typedef 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 */
57struct 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 */
66enum 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 */
125enum {
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
143struct 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
163struct 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
177struct efi_time_cap {
178 u32 resolution;
179 u32 accuracy;
180 u8 sets_to_zero;
181};
182
183enum efi_locate_search_type {
184 all_handles,
185 by_register_notify,
186 by_protocol
187};
188
189struct 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
196enum 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 */
214struct 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 */
231struct 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 */
248struct efi_entry_memmap {
249 u32 version;
250 u32 desc_size;
251 u64 spare;
252 struct efi_mem_desc desc[];
253};
254
255static 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
261struct 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 */
276extern char image_base[];
277
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278/* Start and end of U-Boot image (for payload) */
279extern char _binary_u_boot_dtb_bin_start[], _binary_u_boot_dtb_bin_end[];
280
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281/**
282 * efi_get_sys_table() - Get access to the main EFI system table
283 *
284 * @return pointer to EFI system table
285 */
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287struct 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 */
296unsigned 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 */
306int 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 */
317void *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 */
325void 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 */
333void 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 */
341void 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 */
352int 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 */
365void *efi_build_mem_table(struct efi_entry_memmap *map, int size, bool skip_bs);
366
367#endif /* _LINUX_EFI_H */