efi_loader: efi variable support
[platform/kernel/u-boot.git] / cmd / bootefi.c
1 /*
2  *  EFI application loader
3  *
4  *  Copyright (c) 2016 Alexander Graf
5  *
6  *  SPDX-License-Identifier:     GPL-2.0+
7  */
8
9 #include <common.h>
10 #include <command.h>
11 #include <dm.h>
12 #include <efi_loader.h>
13 #include <errno.h>
14 #include <libfdt.h>
15 #include <libfdt_env.h>
16 #include <memalign.h>
17 #include <asm/global_data.h>
18 #include <asm-generic/sections.h>
19 #include <linux/linkage.h>
20
21 DECLARE_GLOBAL_DATA_PTR;
22
23 static uint8_t efi_obj_list_initalized;
24
25 static struct efi_device_path *bootefi_image_path;
26 static struct efi_device_path *bootefi_device_path;
27
28 /* Initialize and populate EFI object list */
29 static void efi_init_obj_list(void)
30 {
31         efi_obj_list_initalized = 1;
32
33         efi_console_register();
34 #ifdef CONFIG_PARTITIONS
35         efi_disk_register();
36 #endif
37 #if defined(CONFIG_LCD) || defined(CONFIG_DM_VIDEO)
38         efi_gop_register();
39 #endif
40 #ifdef CONFIG_NET
41         efi_net_register();
42 #endif
43 #ifdef CONFIG_GENERATE_SMBIOS_TABLE
44         efi_smbios_register();
45 #endif
46
47         /* Initialize EFI runtime services */
48         efi_reset_system_init();
49         efi_get_time_init();
50 }
51
52 static void *copy_fdt(void *fdt)
53 {
54         u64 fdt_size = fdt_totalsize(fdt);
55         unsigned long fdt_ram_start = -1L, fdt_pages;
56         u64 new_fdt_addr;
57         void *new_fdt;
58         int i;
59
60         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
61                 u64 ram_start = gd->bd->bi_dram[i].start;
62                 u64 ram_size = gd->bd->bi_dram[i].size;
63
64                 if (!ram_size)
65                         continue;
66
67                 if (ram_start < fdt_ram_start)
68                         fdt_ram_start = ram_start;
69         }
70
71         /* Give us at least 4kb breathing room */
72         fdt_size = ALIGN(fdt_size + 4096, EFI_PAGE_SIZE);
73         fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
74
75         /* Safe fdt location is at 128MB */
76         new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size;
77         if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages,
78                                &new_fdt_addr) != EFI_SUCCESS) {
79                 /* If we can't put it there, put it somewhere */
80                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
81                 if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages,
82                                        &new_fdt_addr) != EFI_SUCCESS) {
83                         printf("ERROR: Failed to reserve space for FDT\n");
84                         return NULL;
85                 }
86         }
87
88         new_fdt = (void*)(ulong)new_fdt_addr;
89         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
90         fdt_set_totalsize(new_fdt, fdt_size);
91
92         return new_fdt;
93 }
94
95 static ulong efi_do_enter(void *image_handle,
96                           struct efi_system_table *st,
97                           asmlinkage ulong (*entry)(void *image_handle,
98                                 struct efi_system_table *st))
99 {
100         efi_status_t ret = EFI_LOAD_ERROR;
101
102         if (entry)
103                 ret = entry(image_handle, st);
104         st->boottime->exit(image_handle, ret, 0, NULL);
105         return ret;
106 }
107
108 #ifdef CONFIG_ARM64
109 static unsigned long efi_run_in_el2(asmlinkage ulong (*entry)(
110                         void *image_handle, struct efi_system_table *st),
111                         void *image_handle, struct efi_system_table *st)
112 {
113         /* Enable caches again */
114         dcache_enable();
115
116         return efi_do_enter(image_handle, st, entry);
117 }
118 #endif
119
120 /*
121  * Load an EFI payload into a newly allocated piece of memory, register all
122  * EFI objects it would want to access and jump to it.
123  */
124 static unsigned long do_bootefi_exec(void *efi, void *fdt,
125                                      struct efi_device_path *device_path,
126                                      struct efi_device_path *image_path)
127 {
128         struct efi_loaded_image loaded_image_info = {};
129         struct efi_object loaded_image_info_obj = {};
130         ulong ret;
131
132         ulong (*entry)(void *image_handle, struct efi_system_table *st)
133                 asmlinkage;
134         ulong fdt_pages, fdt_size, fdt_start, fdt_end;
135         const efi_guid_t fdt_guid = EFI_FDT_GUID;
136         bootm_headers_t img = { 0 };
137
138         /* Initialize and populate EFI object list */
139         if (!efi_obj_list_initalized)
140                 efi_init_obj_list();
141
142         efi_setup_loaded_image(&loaded_image_info, &loaded_image_info_obj,
143                                device_path, image_path);
144
145         /*
146          * gd lives in a fixed register which may get clobbered while we execute
147          * the payload. So save it here and restore it on every callback entry
148          */
149         efi_save_gd();
150
151         if (fdt && !fdt_check_header(fdt)) {
152                 /* Prepare fdt for payload */
153                 fdt = copy_fdt(fdt);
154
155                 if (image_setup_libfdt(&img, fdt, 0, NULL)) {
156                         printf("ERROR: Failed to process device tree\n");
157                         return -EINVAL;
158                 }
159
160                 /* Link to it in the efi tables */
161                 efi_install_configuration_table(&fdt_guid, fdt);
162
163                 /* And reserve the space in the memory map */
164                 fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK;
165                 fdt_end = ((ulong)fdt) + fdt_totalsize(fdt);
166                 fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK;
167                 fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
168                 /* Give a bootloader the chance to modify the device tree */
169                 fdt_pages += 2;
170                 efi_add_memory_map(fdt_start, fdt_pages,
171                                    EFI_BOOT_SERVICES_DATA, true);
172         } else {
173                 printf("WARNING: Invalid device tree, expect boot to fail\n");
174                 efi_install_configuration_table(&fdt_guid, NULL);
175         }
176
177         /* Load the EFI payload */
178         entry = efi_load_pe(efi, &loaded_image_info);
179         if (!entry) {
180                 ret = -ENOENT;
181                 goto exit;
182         }
183
184         /* we don't support much: */
185         env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
186                 "{ro,boot}(blob)0000000000000000");
187
188         /* Call our payload! */
189         debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
190
191         if (setjmp(&loaded_image_info.exit_jmp)) {
192                 ret = loaded_image_info.exit_status;
193                 EFI_EXIT(ret);
194                 goto exit;
195         }
196
197 #ifdef CONFIG_ARM64
198         /* On AArch64 we need to make sure we call our payload in < EL3 */
199         if (current_el() == 3) {
200                 smp_kick_all_cpus();
201                 dcache_disable();       /* flush cache before switch to EL2 */
202
203                 /* Move into EL2 and keep running there */
204                 armv8_switch_to_el2((ulong)entry, (ulong)&loaded_image_info,
205                                     (ulong)&systab, 0, (ulong)efi_run_in_el2,
206                                     ES_TO_AARCH64);
207
208                 /* Should never reach here, efi exits with longjmp */
209                 while (1) { }
210         }
211 #endif
212
213         ret = efi_do_enter(&loaded_image_info, &systab, entry);
214
215 exit:
216         /* image has returned, loaded-image obj goes *poof*: */
217         list_del(&loaded_image_info_obj.link);
218
219         return ret;
220 }
221
222 /* Interpreter command to boot an arbitrary EFI image from memory */
223 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
224 {
225         char *saddr, *sfdt;
226         unsigned long addr, fdt_addr = 0;
227         unsigned long r;
228
229         if (argc < 2)
230                 return CMD_RET_USAGE;
231 #ifdef CONFIG_CMD_BOOTEFI_HELLO
232         if (!strcmp(argv[1], "hello")) {
233                 ulong size = __efi_helloworld_end - __efi_helloworld_begin;
234
235                 saddr = env_get("loadaddr");
236                 if (saddr)
237                         addr = simple_strtoul(saddr, NULL, 16);
238                 else
239                         addr = CONFIG_SYS_LOAD_ADDR;
240                 memcpy((char *)addr, __efi_helloworld_begin, size);
241         } else
242 #endif
243 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
244         if (!strcmp(argv[1], "selftest")) {
245                 /*
246                  * gd lives in a fixed register which may get clobbered while we
247                  * execute the payload. So save it here and restore it on every
248                  * callback entry
249                  */
250                 efi_save_gd();
251                 /* Initialize and populate EFI object list */
252                 if (!efi_obj_list_initalized)
253                         efi_init_obj_list();
254                 loaded_image_info.device_handle = bootefi_device_path;
255                 loaded_image_info.file_path = bootefi_image_path;
256                 return efi_selftest(&loaded_image_info, &systab);
257         } else
258 #endif
259         {
260                 saddr = argv[1];
261
262                 addr = simple_strtoul(saddr, NULL, 16);
263
264                 if (argc > 2) {
265                         sfdt = argv[2];
266                         fdt_addr = simple_strtoul(sfdt, NULL, 16);
267                 }
268         }
269
270         printf("## Starting EFI application at %08lx ...\n", addr);
271         r = do_bootefi_exec((void *)addr, (void *)fdt_addr,
272                             bootefi_device_path, bootefi_image_path);
273         printf("## Application terminated, r = %lu\n",
274                r & ~EFI_ERROR_MASK);
275
276         if (r != EFI_SUCCESS)
277                 return 1;
278         else
279                 return 0;
280 }
281
282 #ifdef CONFIG_SYS_LONGHELP
283 static char bootefi_help_text[] =
284         "<image address> [fdt address]\n"
285         "  - boot EFI payload stored at address <image address>.\n"
286         "    If specified, the device tree located at <fdt address> gets\n"
287         "    exposed as EFI configuration table.\n"
288 #ifdef CONFIG_CMD_BOOTEFI_HELLO
289         "bootefi hello\n"
290         "  - boot a sample Hello World application stored within U-Boot\n"
291 #endif
292 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
293         "bootefi selftest\n"
294         "  - boot an EFI selftest application stored within U-Boot\n"
295 #endif
296         ;
297 #endif
298
299 U_BOOT_CMD(
300         bootefi, 3, 0, do_bootefi,
301         "Boots an EFI payload from memory",
302         bootefi_help_text
303 );
304
305 static int parse_partnum(const char *devnr)
306 {
307         const char *str = strchr(devnr, ':');
308         if (str) {
309                 str++;
310                 return simple_strtoul(str, NULL, 16);
311         }
312         return 0;
313 }
314
315 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
316 {
317         char filename[32] = { 0 }; /* dp->str is u16[32] long */
318         char *s;
319
320         if (strcmp(dev, "Net")) {
321                 struct blk_desc *desc;
322                 int part;
323
324                 desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10));
325                 part = parse_partnum(devnr);
326
327                 bootefi_device_path = efi_dp_from_part(desc, part);
328         } else {
329 #ifdef CONFIG_NET
330                 bootefi_device_path = efi_dp_from_eth();
331 #endif
332         }
333
334         if (strcmp(dev, "Net")) {
335                 /* Add leading / to fs paths, because they're absolute */
336                 snprintf(filename, sizeof(filename), "/%s", path);
337         } else {
338                 snprintf(filename, sizeof(filename), "%s", path);
339         }
340         /* DOS style file path: */
341         s = filename;
342         while ((s = strchr(s, '/')))
343                 *s++ = '\\';
344         bootefi_image_path = efi_dp_from_file(NULL, 0, filename);
345 }