Commit | Line | Data |
---|---|---|
7721da4c RF |
1 | /* |
2 | * Helper functions used by the EFI stub on multiple | |
3 | * architectures. This should be #included by the EFI stub | |
4 | * implementation files. | |
5 | * | |
6 | * Copyright 2011 Intel Corporation; author Matt Fleming | |
7 | * | |
8 | * This file is part of the Linux kernel, and is made available | |
9 | * under the terms of the GNU General Public License version 2. | |
10 | * | |
11 | */ | |
12 | #define EFI_READ_CHUNK_SIZE (1024 * 1024) | |
13 | ||
14 | struct initrd { | |
15 | efi_file_handle_t *handle; | |
16 | u64 size; | |
17 | }; | |
18 | ||
19 | ||
20 | ||
21 | ||
876dc36a RF |
22 | static void efi_char16_printk(efi_system_table_t *sys_table_arg, |
23 | efi_char16_t *str) | |
7721da4c RF |
24 | { |
25 | struct efi_simple_text_output_protocol *out; | |
26 | ||
876dc36a | 27 | out = (struct efi_simple_text_output_protocol *)sys_table_arg->con_out; |
7721da4c RF |
28 | efi_call_phys2(out->output_string, out, str); |
29 | } | |
30 | ||
876dc36a | 31 | static void efi_printk(efi_system_table_t *sys_table_arg, char *str) |
7721da4c RF |
32 | { |
33 | char *s8; | |
34 | ||
35 | for (s8 = str; *s8; s8++) { | |
36 | efi_char16_t ch[2] = { 0 }; | |
37 | ||
38 | ch[0] = *s8; | |
39 | if (*s8 == '\n') { | |
40 | efi_char16_t nl[2] = { '\r', 0 }; | |
876dc36a | 41 | efi_char16_printk(sys_table_arg, nl); |
7721da4c RF |
42 | } |
43 | ||
876dc36a | 44 | efi_char16_printk(sys_table_arg, ch); |
7721da4c RF |
45 | } |
46 | } | |
47 | ||
48 | ||
86cc653b RF |
49 | static efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg, |
50 | efi_memory_desc_t **map, | |
51 | unsigned long *map_size, | |
1c089c65 RF |
52 | unsigned long *desc_size, |
53 | u32 *desc_ver, | |
54 | unsigned long *key_ptr) | |
7721da4c RF |
55 | { |
56 | efi_memory_desc_t *m = NULL; | |
57 | efi_status_t status; | |
58 | unsigned long key; | |
59 | u32 desc_version; | |
60 | ||
61 | *map_size = sizeof(*m) * 32; | |
62 | again: | |
63 | /* | |
64 | * Add an additional efi_memory_desc_t because we're doing an | |
65 | * allocation which may be in a new descriptor region. | |
66 | */ | |
67 | *map_size += sizeof(*m); | |
876dc36a | 68 | status = efi_call_phys3(sys_table_arg->boottime->allocate_pool, |
7721da4c RF |
69 | EFI_LOADER_DATA, *map_size, (void **)&m); |
70 | if (status != EFI_SUCCESS) | |
71 | goto fail; | |
72 | ||
876dc36a RF |
73 | status = efi_call_phys5(sys_table_arg->boottime->get_memory_map, |
74 | map_size, m, &key, desc_size, &desc_version); | |
7721da4c | 75 | if (status == EFI_BUFFER_TOO_SMALL) { |
876dc36a | 76 | efi_call_phys1(sys_table_arg->boottime->free_pool, m); |
7721da4c RF |
77 | goto again; |
78 | } | |
79 | ||
80 | if (status != EFI_SUCCESS) | |
876dc36a | 81 | efi_call_phys1(sys_table_arg->boottime->free_pool, m); |
1c089c65 RF |
82 | if (key_ptr && status == EFI_SUCCESS) |
83 | *key_ptr = key; | |
84 | if (desc_ver && status == EFI_SUCCESS) | |
85 | *desc_ver = desc_version; | |
7721da4c RF |
86 | |
87 | fail: | |
88 | *map = m; | |
89 | return status; | |
90 | } | |
91 | ||
92 | /* | |
93 | * Allocate at the highest possible address that is not above 'max'. | |
94 | */ | |
40e4530a | 95 | static efi_status_t efi_high_alloc(efi_system_table_t *sys_table_arg, |
876dc36a RF |
96 | unsigned long size, unsigned long align, |
97 | unsigned long *addr, unsigned long max) | |
7721da4c RF |
98 | { |
99 | unsigned long map_size, desc_size; | |
100 | efi_memory_desc_t *map; | |
101 | efi_status_t status; | |
102 | unsigned long nr_pages; | |
103 | u64 max_addr = 0; | |
104 | int i; | |
105 | ||
1c089c65 RF |
106 | status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size, |
107 | NULL, NULL); | |
7721da4c RF |
108 | if (status != EFI_SUCCESS) |
109 | goto fail; | |
110 | ||
38dd9c02 RF |
111 | /* |
112 | * Enforce minimum alignment that EFI requires when requesting | |
113 | * a specific address. We are doing page-based allocations, | |
114 | * so we must be aligned to a page. | |
115 | */ | |
116 | if (align < EFI_PAGE_SIZE) | |
117 | align = EFI_PAGE_SIZE; | |
118 | ||
7721da4c RF |
119 | nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; |
120 | again: | |
121 | for (i = 0; i < map_size / desc_size; i++) { | |
122 | efi_memory_desc_t *desc; | |
123 | unsigned long m = (unsigned long)map; | |
124 | u64 start, end; | |
125 | ||
126 | desc = (efi_memory_desc_t *)(m + (i * desc_size)); | |
127 | if (desc->type != EFI_CONVENTIONAL_MEMORY) | |
128 | continue; | |
129 | ||
130 | if (desc->num_pages < nr_pages) | |
131 | continue; | |
132 | ||
133 | start = desc->phys_addr; | |
134 | end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT); | |
135 | ||
136 | if ((start + size) > end || (start + size) > max) | |
137 | continue; | |
138 | ||
139 | if (end - size > max) | |
140 | end = max; | |
141 | ||
142 | if (round_down(end - size, align) < start) | |
143 | continue; | |
144 | ||
145 | start = round_down(end - size, align); | |
146 | ||
147 | /* | |
148 | * Don't allocate at 0x0. It will confuse code that | |
149 | * checks pointers against NULL. | |
150 | */ | |
151 | if (start == 0x0) | |
152 | continue; | |
153 | ||
154 | if (start > max_addr) | |
155 | max_addr = start; | |
156 | } | |
157 | ||
158 | if (!max_addr) | |
159 | status = EFI_NOT_FOUND; | |
160 | else { | |
876dc36a | 161 | status = efi_call_phys4(sys_table_arg->boottime->allocate_pages, |
7721da4c RF |
162 | EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA, |
163 | nr_pages, &max_addr); | |
164 | if (status != EFI_SUCCESS) { | |
165 | max = max_addr; | |
166 | max_addr = 0; | |
167 | goto again; | |
168 | } | |
169 | ||
170 | *addr = max_addr; | |
171 | } | |
172 | ||
173 | free_pool: | |
876dc36a | 174 | efi_call_phys1(sys_table_arg->boottime->free_pool, map); |
7721da4c RF |
175 | |
176 | fail: | |
177 | return status; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Allocate at the lowest possible address. | |
182 | */ | |
40e4530a RF |
183 | static efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg, |
184 | unsigned long size, unsigned long align, | |
7721da4c RF |
185 | unsigned long *addr) |
186 | { | |
187 | unsigned long map_size, desc_size; | |
188 | efi_memory_desc_t *map; | |
189 | efi_status_t status; | |
190 | unsigned long nr_pages; | |
191 | int i; | |
192 | ||
1c089c65 RF |
193 | status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size, |
194 | NULL, NULL); | |
7721da4c RF |
195 | if (status != EFI_SUCCESS) |
196 | goto fail; | |
197 | ||
38dd9c02 RF |
198 | /* |
199 | * Enforce minimum alignment that EFI requires when requesting | |
200 | * a specific address. We are doing page-based allocations, | |
201 | * so we must be aligned to a page. | |
202 | */ | |
203 | if (align < EFI_PAGE_SIZE) | |
204 | align = EFI_PAGE_SIZE; | |
205 | ||
7721da4c RF |
206 | nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; |
207 | for (i = 0; i < map_size / desc_size; i++) { | |
208 | efi_memory_desc_t *desc; | |
209 | unsigned long m = (unsigned long)map; | |
210 | u64 start, end; | |
211 | ||
212 | desc = (efi_memory_desc_t *)(m + (i * desc_size)); | |
213 | ||
214 | if (desc->type != EFI_CONVENTIONAL_MEMORY) | |
215 | continue; | |
216 | ||
217 | if (desc->num_pages < nr_pages) | |
218 | continue; | |
219 | ||
220 | start = desc->phys_addr; | |
221 | end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT); | |
222 | ||
223 | /* | |
224 | * Don't allocate at 0x0. It will confuse code that | |
225 | * checks pointers against NULL. Skip the first 8 | |
226 | * bytes so we start at a nice even number. | |
227 | */ | |
228 | if (start == 0x0) | |
229 | start += 8; | |
230 | ||
231 | start = round_up(start, align); | |
232 | if ((start + size) > end) | |
233 | continue; | |
234 | ||
876dc36a | 235 | status = efi_call_phys4(sys_table_arg->boottime->allocate_pages, |
7721da4c RF |
236 | EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA, |
237 | nr_pages, &start); | |
238 | if (status == EFI_SUCCESS) { | |
239 | *addr = start; | |
240 | break; | |
241 | } | |
242 | } | |
243 | ||
244 | if (i == map_size / desc_size) | |
245 | status = EFI_NOT_FOUND; | |
246 | ||
247 | free_pool: | |
876dc36a | 248 | efi_call_phys1(sys_table_arg->boottime->free_pool, map); |
7721da4c RF |
249 | fail: |
250 | return status; | |
251 | } | |
252 | ||
40e4530a | 253 | static void efi_free(efi_system_table_t *sys_table_arg, unsigned long size, |
876dc36a | 254 | unsigned long addr) |
7721da4c RF |
255 | { |
256 | unsigned long nr_pages; | |
257 | ||
0e1cadb0 RF |
258 | if (!size) |
259 | return; | |
260 | ||
7721da4c | 261 | nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; |
876dc36a | 262 | efi_call_phys2(sys_table_arg->boottime->free_pages, addr, nr_pages); |
7721da4c RF |
263 | } |
264 | ||
265 | ||
266 | /* | |
267 | * Check the cmdline for a LILO-style initrd= arguments. | |
268 | * | |
269 | * We only support loading an initrd from the same filesystem as the | |
270 | * kernel image. | |
271 | */ | |
876dc36a RF |
272 | static efi_status_t handle_ramdisks(efi_system_table_t *sys_table_arg, |
273 | efi_loaded_image_t *image, | |
7721da4c RF |
274 | struct setup_header *hdr) |
275 | { | |
276 | struct initrd *initrds; | |
277 | unsigned long initrd_addr; | |
278 | efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID; | |
279 | u64 initrd_total; | |
280 | efi_file_io_interface_t *io; | |
281 | efi_file_handle_t *fh; | |
282 | efi_status_t status; | |
283 | int nr_initrds; | |
284 | char *str; | |
285 | int i, j, k; | |
286 | ||
287 | initrd_addr = 0; | |
288 | initrd_total = 0; | |
289 | ||
290 | str = (char *)(unsigned long)hdr->cmd_line_ptr; | |
291 | ||
292 | j = 0; /* See close_handles */ | |
293 | ||
294 | if (!str || !*str) | |
295 | return EFI_SUCCESS; | |
296 | ||
297 | for (nr_initrds = 0; *str; nr_initrds++) { | |
298 | str = strstr(str, "initrd="); | |
299 | if (!str) | |
300 | break; | |
301 | ||
302 | str += 7; | |
303 | ||
304 | /* Skip any leading slashes */ | |
305 | while (*str == '/' || *str == '\\') | |
306 | str++; | |
307 | ||
308 | while (*str && *str != ' ' && *str != '\n') | |
309 | str++; | |
310 | } | |
311 | ||
312 | if (!nr_initrds) | |
313 | return EFI_SUCCESS; | |
314 | ||
876dc36a | 315 | status = efi_call_phys3(sys_table_arg->boottime->allocate_pool, |
7721da4c RF |
316 | EFI_LOADER_DATA, |
317 | nr_initrds * sizeof(*initrds), | |
318 | &initrds); | |
319 | if (status != EFI_SUCCESS) { | |
876dc36a | 320 | efi_printk(sys_table_arg, "Failed to alloc mem for initrds\n"); |
7721da4c RF |
321 | goto fail; |
322 | } | |
323 | ||
324 | str = (char *)(unsigned long)hdr->cmd_line_ptr; | |
325 | for (i = 0; i < nr_initrds; i++) { | |
326 | struct initrd *initrd; | |
327 | efi_file_handle_t *h; | |
328 | efi_file_info_t *info; | |
329 | efi_char16_t filename_16[256]; | |
330 | unsigned long info_sz; | |
331 | efi_guid_t info_guid = EFI_FILE_INFO_ID; | |
332 | efi_char16_t *p; | |
333 | u64 file_sz; | |
334 | ||
335 | str = strstr(str, "initrd="); | |
336 | if (!str) | |
337 | break; | |
338 | ||
339 | str += 7; | |
340 | ||
341 | initrd = &initrds[i]; | |
342 | p = filename_16; | |
343 | ||
344 | /* Skip any leading slashes */ | |
345 | while (*str == '/' || *str == '\\') | |
346 | str++; | |
347 | ||
348 | while (*str && *str != ' ' && *str != '\n') { | |
349 | if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16)) | |
350 | break; | |
351 | ||
352 | if (*str == '/') { | |
353 | *p++ = '\\'; | |
354 | *str++; | |
355 | } else { | |
356 | *p++ = *str++; | |
357 | } | |
358 | } | |
359 | ||
360 | *p = '\0'; | |
361 | ||
362 | /* Only open the volume once. */ | |
363 | if (!i) { | |
364 | efi_boot_services_t *boottime; | |
365 | ||
876dc36a | 366 | boottime = sys_table_arg->boottime; |
7721da4c RF |
367 | |
368 | status = efi_call_phys3(boottime->handle_protocol, | |
369 | image->device_handle, &fs_proto, &io); | |
370 | if (status != EFI_SUCCESS) { | |
876dc36a | 371 | efi_printk(sys_table_arg, "Failed to handle fs_proto\n"); |
7721da4c RF |
372 | goto free_initrds; |
373 | } | |
374 | ||
375 | status = efi_call_phys2(io->open_volume, io, &fh); | |
376 | if (status != EFI_SUCCESS) { | |
876dc36a | 377 | efi_printk(sys_table_arg, "Failed to open volume\n"); |
7721da4c RF |
378 | goto free_initrds; |
379 | } | |
380 | } | |
381 | ||
382 | status = efi_call_phys5(fh->open, fh, &h, filename_16, | |
383 | EFI_FILE_MODE_READ, (u64)0); | |
384 | if (status != EFI_SUCCESS) { | |
876dc36a RF |
385 | efi_printk(sys_table_arg, "Failed to open initrd file: "); |
386 | efi_char16_printk(sys_table_arg, filename_16); | |
387 | efi_printk(sys_table_arg, "\n"); | |
7721da4c RF |
388 | goto close_handles; |
389 | } | |
390 | ||
391 | initrd->handle = h; | |
392 | ||
393 | info_sz = 0; | |
394 | status = efi_call_phys4(h->get_info, h, &info_guid, | |
395 | &info_sz, NULL); | |
396 | if (status != EFI_BUFFER_TOO_SMALL) { | |
876dc36a | 397 | efi_printk(sys_table_arg, "Failed to get initrd info size\n"); |
7721da4c RF |
398 | goto close_handles; |
399 | } | |
400 | ||
401 | grow: | |
876dc36a | 402 | status = efi_call_phys3(sys_table_arg->boottime->allocate_pool, |
7721da4c RF |
403 | EFI_LOADER_DATA, info_sz, &info); |
404 | if (status != EFI_SUCCESS) { | |
876dc36a | 405 | efi_printk(sys_table_arg, "Failed to alloc mem for initrd info\n"); |
7721da4c RF |
406 | goto close_handles; |
407 | } | |
408 | ||
409 | status = efi_call_phys4(h->get_info, h, &info_guid, | |
410 | &info_sz, info); | |
411 | if (status == EFI_BUFFER_TOO_SMALL) { | |
876dc36a RF |
412 | efi_call_phys1(sys_table_arg->boottime->free_pool, |
413 | info); | |
7721da4c RF |
414 | goto grow; |
415 | } | |
416 | ||
417 | file_sz = info->file_size; | |
876dc36a | 418 | efi_call_phys1(sys_table_arg->boottime->free_pool, info); |
7721da4c RF |
419 | |
420 | if (status != EFI_SUCCESS) { | |
876dc36a | 421 | efi_printk(sys_table_arg, "Failed to get initrd info\n"); |
7721da4c RF |
422 | goto close_handles; |
423 | } | |
424 | ||
425 | initrd->size = file_sz; | |
426 | initrd_total += file_sz; | |
427 | } | |
428 | ||
429 | if (initrd_total) { | |
430 | unsigned long addr; | |
431 | ||
432 | /* | |
433 | * Multiple initrd's need to be at consecutive | |
434 | * addresses in memory, so allocate enough memory for | |
435 | * all the initrd's. | |
436 | */ | |
40e4530a RF |
437 | status = efi_high_alloc(sys_table_arg, initrd_total, 0x1000, |
438 | &initrd_addr, hdr->initrd_addr_max); | |
7721da4c | 439 | if (status != EFI_SUCCESS) { |
876dc36a | 440 | efi_printk(sys_table_arg, "Failed to alloc highmem for initrds\n"); |
7721da4c RF |
441 | goto close_handles; |
442 | } | |
443 | ||
444 | /* We've run out of free low memory. */ | |
445 | if (initrd_addr > hdr->initrd_addr_max) { | |
876dc36a | 446 | efi_printk(sys_table_arg, "We've run out of free low memory\n"); |
7721da4c RF |
447 | status = EFI_INVALID_PARAMETER; |
448 | goto free_initrd_total; | |
449 | } | |
450 | ||
451 | addr = initrd_addr; | |
452 | for (j = 0; j < nr_initrds; j++) { | |
453 | u64 size; | |
454 | ||
455 | size = initrds[j].size; | |
456 | while (size) { | |
457 | u64 chunksize; | |
458 | if (size > EFI_READ_CHUNK_SIZE) | |
459 | chunksize = EFI_READ_CHUNK_SIZE; | |
460 | else | |
461 | chunksize = size; | |
462 | status = efi_call_phys3(fh->read, | |
463 | initrds[j].handle, | |
464 | &chunksize, addr); | |
465 | if (status != EFI_SUCCESS) { | |
876dc36a | 466 | efi_printk(sys_table_arg, "Failed to read initrd\n"); |
7721da4c RF |
467 | goto free_initrd_total; |
468 | } | |
469 | addr += chunksize; | |
470 | size -= chunksize; | |
471 | } | |
472 | ||
473 | efi_call_phys1(fh->close, initrds[j].handle); | |
474 | } | |
475 | ||
476 | } | |
477 | ||
876dc36a | 478 | efi_call_phys1(sys_table_arg->boottime->free_pool, initrds); |
7721da4c RF |
479 | |
480 | hdr->ramdisk_image = initrd_addr; | |
481 | hdr->ramdisk_size = initrd_total; | |
482 | ||
483 | return status; | |
484 | ||
485 | free_initrd_total: | |
40e4530a | 486 | efi_free(sys_table_arg, initrd_total, initrd_addr); |
7721da4c RF |
487 | |
488 | close_handles: | |
489 | for (k = j; k < i; k++) | |
490 | efi_call_phys1(fh->close, initrds[k].handle); | |
491 | free_initrds: | |
876dc36a | 492 | efi_call_phys1(sys_table_arg->boottime->free_pool, initrds); |
7721da4c RF |
493 | fail: |
494 | hdr->ramdisk_image = 0; | |
495 | hdr->ramdisk_size = 0; | |
496 | ||
497 | return status; | |
498 | } | |
4a9f3a7c RF |
499 | /* |
500 | * Relocate a kernel image, either compressed or uncompressed. | |
501 | * In the ARM64 case, all kernel images are currently | |
502 | * uncompressed, and as such when we relocate it we need to | |
503 | * allocate additional space for the BSS segment. Any low | |
504 | * memory that this function should avoid needs to be | |
505 | * unavailable in the EFI memory map, as if the preferred | |
506 | * address is not available the lowest available address will | |
507 | * be used. | |
508 | */ | |
509 | static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg, | |
510 | unsigned long *image_addr, | |
511 | unsigned long image_size, | |
512 | unsigned long alloc_size, | |
513 | unsigned long preferred_addr, | |
514 | unsigned long alignment) | |
c6866d72 | 515 | { |
4a9f3a7c RF |
516 | unsigned long cur_image_addr; |
517 | unsigned long new_addr = 0; | |
c6866d72 | 518 | efi_status_t status; |
4a9f3a7c RF |
519 | unsigned long nr_pages; |
520 | efi_physical_addr_t efi_addr = preferred_addr; | |
521 | ||
522 | if (!image_addr || !image_size || !alloc_size) | |
523 | return EFI_INVALID_PARAMETER; | |
524 | if (alloc_size < image_size) | |
525 | return EFI_INVALID_PARAMETER; | |
526 | ||
527 | cur_image_addr = *image_addr; | |
c6866d72 RF |
528 | |
529 | /* | |
530 | * The EFI firmware loader could have placed the kernel image | |
4a9f3a7c RF |
531 | * anywhere in memory, but the kernel has restrictions on the |
532 | * max physical address it can run at. Some architectures | |
533 | * also have a prefered address, so first try to relocate | |
534 | * to the preferred address. If that fails, allocate as low | |
535 | * as possible while respecting the required alignment. | |
c6866d72 | 536 | */ |
4a9f3a7c RF |
537 | nr_pages = round_up(alloc_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; |
538 | status = efi_call_phys4(sys_table_arg->boottime->allocate_pages, | |
c6866d72 | 539 | EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA, |
4a9f3a7c RF |
540 | nr_pages, &efi_addr); |
541 | new_addr = efi_addr; | |
542 | /* | |
543 | * If preferred address allocation failed allocate as low as | |
544 | * possible. | |
545 | */ | |
c6866d72 | 546 | if (status != EFI_SUCCESS) { |
4a9f3a7c RF |
547 | status = efi_low_alloc(sys_table_arg, alloc_size, alignment, |
548 | &new_addr); | |
549 | } | |
550 | if (status != EFI_SUCCESS) { | |
551 | efi_printk(sys_table_arg, "ERROR: Failed to allocate usable memory for kernel.\n"); | |
552 | return status; | |
c6866d72 RF |
553 | } |
554 | ||
4a9f3a7c RF |
555 | /* |
556 | * We know source/dest won't overlap since both memory ranges | |
557 | * have been allocated by UEFI, so we can safely use memcpy. | |
558 | */ | |
559 | memcpy((void *)new_addr, (void *)cur_image_addr, image_size); | |
560 | /* Zero any extra space we may have allocated for BSS. */ | |
561 | memset((void *)(new_addr + image_size), alloc_size - image_size, 0); | |
c6866d72 | 562 | |
4a9f3a7c RF |
563 | /* Return the new address of the relocated image. */ |
564 | *image_addr = new_addr; | |
c6866d72 RF |
565 | |
566 | return status; | |
567 | } | |
5fef3870 RF |
568 | |
569 | /* | |
570 | * Convert the unicode UEFI command line to ASCII to pass to kernel. | |
571 | * Size of memory allocated return in *cmd_line_len. | |
572 | * Returns NULL on error. | |
573 | */ | |
574 | static char *efi_convert_cmdline_to_ascii(efi_system_table_t *sys_table_arg, | |
575 | efi_loaded_image_t *image, | |
576 | int *cmd_line_len) | |
577 | { | |
578 | u16 *s2; | |
579 | u8 *s1 = NULL; | |
580 | unsigned long cmdline_addr = 0; | |
581 | int load_options_size = image->load_options_size / 2; /* ASCII */ | |
582 | void *options = image->load_options; | |
583 | int options_size = 0; | |
584 | efi_status_t status; | |
585 | int i; | |
586 | u16 zero = 0; | |
587 | ||
588 | if (options) { | |
589 | s2 = options; | |
590 | while (*s2 && *s2 != '\n' && options_size < load_options_size) { | |
591 | s2++; | |
592 | options_size++; | |
593 | } | |
594 | } | |
595 | ||
596 | if (options_size == 0) { | |
597 | /* No command line options, so return empty string*/ | |
598 | options_size = 1; | |
599 | options = &zero; | |
600 | } | |
601 | ||
602 | options_size++; /* NUL termination */ | |
603 | #ifdef CONFIG_ARM | |
604 | /* | |
605 | * For ARM, allocate at a high address to avoid reserved | |
606 | * regions at low addresses that we don't know the specfics of | |
607 | * at the time we are processing the command line. | |
608 | */ | |
609 | status = efi_high_alloc(sys_table_arg, options_size, 0, | |
610 | &cmdline_addr, 0xfffff000); | |
611 | #else | |
612 | status = efi_low_alloc(sys_table_arg, options_size, 0, | |
613 | &cmdline_addr); | |
614 | #endif | |
615 | if (status != EFI_SUCCESS) | |
616 | return NULL; | |
617 | ||
618 | s1 = (u8 *)cmdline_addr; | |
619 | s2 = (u16 *)options; | |
620 | ||
621 | for (i = 0; i < options_size - 1; i++) | |
622 | *s1++ = *s2++; | |
623 | ||
624 | *s1 = '\0'; | |
625 | ||
626 | *cmd_line_len = options_size; | |
627 | return (char *)cmdline_addr; | |
628 | } |