Commit | Line | Data |
---|---|---|
5b83683f HY |
1 | /* |
2 | * Common EFI (Extensible Firmware Interface) support functions | |
3 | * Based on Extensible Firmware Interface Specification version 1.0 | |
4 | * | |
5 | * Copyright (C) 1999 VA Linux Systems | |
6 | * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> | |
7 | * Copyright (C) 1999-2002 Hewlett-Packard Co. | |
8 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
9 | * Stephane Eranian <eranian@hpl.hp.com> | |
10 | * Copyright (C) 2005-2008 Intel Co. | |
11 | * Fenghua Yu <fenghua.yu@intel.com> | |
12 | * Bibo Mao <bibo.mao@intel.com> | |
13 | * Chandramouli Narayanan <mouli@linux.intel.com> | |
14 | * Huang Ying <ying.huang@intel.com> | |
d2f7cbe7 BP |
15 | * Copyright (C) 2013 SuSE Labs |
16 | * Borislav Petkov <bp@suse.de> - runtime services VA mapping | |
5b83683f HY |
17 | * |
18 | * Copied from efi_32.c to eliminate the duplicated code between EFI | |
19 | * 32/64 support code. --ying 2007-10-26 | |
20 | * | |
21 | * All EFI Runtime Services are not implemented yet as EFI only | |
22 | * supports physical mode addressing on SoftSDV. This is to be fixed | |
23 | * in a future version. --drummond 1999-07-20 | |
24 | * | |
25 | * Implemented EFI runtime services and virtual mode calls. --davidm | |
26 | * | |
27 | * Goutham Rao: <goutham.rao@intel.com> | |
28 | * Skip non-WB memory and ignore empty memory ranges. | |
29 | */ | |
30 | ||
e3cb3f5a OJ |
31 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
32 | ||
5b83683f HY |
33 | #include <linux/kernel.h> |
34 | #include <linux/init.h> | |
35 | #include <linux/efi.h> | |
2223af38 | 36 | #include <linux/efi-bgrt.h> |
69c60c88 | 37 | #include <linux/export.h> |
5b83683f | 38 | #include <linux/bootmem.h> |
0d01ff25 | 39 | #include <linux/slab.h> |
a9ce6bc1 | 40 | #include <linux/memblock.h> |
5b83683f HY |
41 | #include <linux/spinlock.h> |
42 | #include <linux/uaccess.h> | |
43 | #include <linux/time.h> | |
44 | #include <linux/io.h> | |
45 | #include <linux/reboot.h> | |
46 | #include <linux/bcd.h> | |
47 | ||
48 | #include <asm/setup.h> | |
49 | #include <asm/efi.h> | |
50 | #include <asm/time.h> | |
a2172e25 HY |
51 | #include <asm/cacheflush.h> |
52 | #include <asm/tlbflush.h> | |
7bd867df | 53 | #include <asm/x86_init.h> |
3195ef59 | 54 | #include <asm/rtc.h> |
a5d90c92 | 55 | #include <asm/uv/uv.h> |
5b83683f | 56 | |
ecaea42e | 57 | static struct efi efi_phys __initdata; |
5b83683f HY |
58 | static efi_system_table_t efi_systab __initdata; |
59 | ||
9b7d2049 | 60 | static efi_config_table_type_t arch_tables[] __initdata = { |
272686bf LL |
61 | #ifdef CONFIG_X86_UV |
62 | {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab}, | |
63 | #endif | |
722da9d2 | 64 | {NULL_GUID, NULL, NULL}, |
272686bf LL |
65 | }; |
66 | ||
1fec0533 | 67 | u64 efi_setup; /* efi setup_data physical address */ |
926172d4 | 68 | |
60920685 | 69 | static int add_efi_memmap __initdata; |
200001eb PJ |
70 | static int __init setup_add_efi_memmap(char *arg) |
71 | { | |
72 | add_efi_memmap = 1; | |
73 | return 0; | |
74 | } | |
75 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
76 | ||
5b83683f HY |
77 | static efi_status_t __init phys_efi_set_virtual_address_map( |
78 | unsigned long memory_map_size, | |
79 | unsigned long descriptor_size, | |
80 | u32 descriptor_version, | |
81 | efi_memory_desc_t *virtual_map) | |
82 | { | |
83 | efi_status_t status; | |
23a0d4e8 | 84 | unsigned long flags; |
744937b0 | 85 | pgd_t *save_pgd; |
5b83683f | 86 | |
744937b0 | 87 | save_pgd = efi_call_phys_prolog(); |
23a0d4e8 IM |
88 | |
89 | /* Disable interrupts around EFI calls: */ | |
90 | local_irq_save(flags); | |
62fa6e69 MF |
91 | status = efi_call_phys(efi_phys.set_virtual_address_map, |
92 | memory_map_size, descriptor_size, | |
93 | descriptor_version, virtual_map); | |
23a0d4e8 IM |
94 | local_irq_restore(flags); |
95 | ||
744937b0 | 96 | efi_call_phys_epilog(save_pgd); |
23a0d4e8 | 97 | |
5b83683f HY |
98 | return status; |
99 | } | |
100 | ||
b05b9f5f TL |
101 | void __init efi_find_mirror(void) |
102 | { | |
78ce248f | 103 | efi_memory_desc_t *md; |
b05b9f5f TL |
104 | u64 mirror_size = 0, total_size = 0; |
105 | ||
78ce248f | 106 | for_each_efi_memory_desc(md) { |
b05b9f5f TL |
107 | unsigned long long start = md->phys_addr; |
108 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
109 | ||
110 | total_size += size; | |
111 | if (md->attribute & EFI_MEMORY_MORE_RELIABLE) { | |
112 | memblock_mark_mirror(start, size); | |
113 | mirror_size += size; | |
114 | } | |
115 | } | |
116 | if (mirror_size) | |
117 | pr_info("Memory: %lldM/%lldM mirrored memory\n", | |
118 | mirror_size>>20, total_size>>20); | |
119 | } | |
120 | ||
69c91893 PJ |
121 | /* |
122 | * Tell the kernel about the EFI memory map. This might include | |
123 | * more than the max 128 entries that can fit in the e820 legacy | |
124 | * (zeropage) memory map. | |
125 | */ | |
126 | ||
200001eb | 127 | static void __init do_add_efi_memmap(void) |
69c91893 | 128 | { |
78ce248f | 129 | efi_memory_desc_t *md; |
69c91893 | 130 | |
78ce248f | 131 | for_each_efi_memory_desc(md) { |
69c91893 PJ |
132 | unsigned long long start = md->phys_addr; |
133 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
134 | int e820_type; | |
135 | ||
e2a71476 CW |
136 | switch (md->type) { |
137 | case EFI_LOADER_CODE: | |
138 | case EFI_LOADER_DATA: | |
139 | case EFI_BOOT_SERVICES_CODE: | |
140 | case EFI_BOOT_SERVICES_DATA: | |
141 | case EFI_CONVENTIONAL_MEMORY: | |
142 | if (md->attribute & EFI_MEMORY_WB) | |
143 | e820_type = E820_RAM; | |
144 | else | |
145 | e820_type = E820_RESERVED; | |
146 | break; | |
147 | case EFI_ACPI_RECLAIM_MEMORY: | |
148 | e820_type = E820_ACPI; | |
149 | break; | |
150 | case EFI_ACPI_MEMORY_NVS: | |
151 | e820_type = E820_NVS; | |
152 | break; | |
153 | case EFI_UNUSABLE_MEMORY: | |
154 | e820_type = E820_UNUSABLE; | |
155 | break; | |
ad5fb870 DW |
156 | case EFI_PERSISTENT_MEMORY: |
157 | e820_type = E820_PMEM; | |
158 | break; | |
e2a71476 CW |
159 | default: |
160 | /* | |
161 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
162 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
163 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
164 | */ | |
69c91893 | 165 | e820_type = E820_RESERVED; |
e2a71476 CW |
166 | break; |
167 | } | |
d0be6bde | 168 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
169 | } |
170 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
171 | } | |
172 | ||
1adbfa35 | 173 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 174 | { |
15b9c359 | 175 | struct efi_info *e = &boot_params.efi_info; |
44511fb9 | 176 | phys_addr_t pmap; |
ecacf09f | 177 | |
9f27bc54 DK |
178 | if (efi_enabled(EFI_PARAVIRT)) |
179 | return 0; | |
180 | ||
05486fa7 | 181 | #ifdef CONFIG_X86_32 |
1adbfa35 | 182 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 183 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
184 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
185 | return -EINVAL; | |
186 | } | |
15b9c359 | 187 | pmap = e->efi_memmap; |
05486fa7 | 188 | #else |
15b9c359 | 189 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 190 | #endif |
884f4f66 MF |
191 | efi.memmap.phys_map = pmap; |
192 | efi.memmap.nr_map = e->efi_memmap_size / | |
15b9c359 | 193 | e->efi_memdesc_size; |
884f4f66 MF |
194 | efi.memmap.desc_size = e->efi_memdesc_size; |
195 | efi.memmap.desc_version = e->efi_memdesc_version; | |
1adbfa35 | 196 | |
0d054ad9 AB |
197 | WARN(efi.memmap.desc_version != 1, |
198 | "Unexpected EFI_MEMORY_DESCRIPTOR version %ld", | |
199 | efi.memmap.desc_version); | |
200 | ||
884f4f66 | 201 | memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size); |
258f6fd7 | 202 | |
1adbfa35 | 203 | return 0; |
ecacf09f HY |
204 | } |
205 | ||
0bbea1ce | 206 | void __init efi_print_memmap(void) |
5b83683f HY |
207 | { |
208 | efi_memory_desc_t *md; | |
78ce248f | 209 | int i = 0; |
5b83683f | 210 | |
78ce248f | 211 | for_each_efi_memory_desc(md) { |
ace1d121 LE |
212 | char buf[64]; |
213 | ||
1e82b947 | 214 | pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n", |
78ce248f | 215 | i++, efi_md_typeattr_format(buf, sizeof(buf), md), |
ace1d121 | 216 | md->phys_addr, |
1e82b947 | 217 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1, |
5b83683f HY |
218 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); |
219 | } | |
f4fccac0 | 220 | } |
5b83683f | 221 | |
5189c2a7 | 222 | void __init efi_unmap_memmap(void) |
78510792 | 223 | { |
884f4f66 MF |
224 | unsigned long size; |
225 | ||
3e909599 | 226 | clear_bit(EFI_MEMMAP, &efi.flags); |
884f4f66 MF |
227 | |
228 | size = efi.memmap.nr_map * efi.memmap.desc_size; | |
229 | if (efi.memmap.map) { | |
230 | early_memunmap(efi.memmap.map, size); | |
231 | efi.memmap.map = NULL; | |
78510792 JT |
232 | } |
233 | } | |
234 | ||
140bf275 | 235 | static int __init efi_systab_init(void *phys) |
5b83683f | 236 | { |
83e68189 | 237 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 | 238 | efi_system_table_64_t *systab64; |
1fec0533 | 239 | struct efi_setup_data *data = NULL; |
1adbfa35 OJ |
240 | u64 tmp = 0; |
241 | ||
1fec0533 DY |
242 | if (efi_setup) { |
243 | data = early_memremap(efi_setup, sizeof(*data)); | |
244 | if (!data) | |
245 | return -ENOMEM; | |
246 | } | |
abc93f8e | 247 | systab64 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
248 | sizeof(*systab64)); |
249 | if (systab64 == NULL) { | |
250 | pr_err("Couldn't map the system table!\n"); | |
1fec0533 | 251 | if (data) |
abc93f8e | 252 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
253 | return -ENOMEM; |
254 | } | |
255 | ||
256 | efi_systab.hdr = systab64->hdr; | |
1fec0533 DY |
257 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
258 | systab64->fw_vendor; | |
259 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; | |
1adbfa35 OJ |
260 | efi_systab.fw_revision = systab64->fw_revision; |
261 | efi_systab.con_in_handle = systab64->con_in_handle; | |
262 | tmp |= systab64->con_in_handle; | |
263 | efi_systab.con_in = systab64->con_in; | |
264 | tmp |= systab64->con_in; | |
265 | efi_systab.con_out_handle = systab64->con_out_handle; | |
266 | tmp |= systab64->con_out_handle; | |
267 | efi_systab.con_out = systab64->con_out; | |
268 | tmp |= systab64->con_out; | |
269 | efi_systab.stderr_handle = systab64->stderr_handle; | |
270 | tmp |= systab64->stderr_handle; | |
271 | efi_systab.stderr = systab64->stderr; | |
272 | tmp |= systab64->stderr; | |
1fec0533 DY |
273 | efi_systab.runtime = data ? |
274 | (void *)(unsigned long)data->runtime : | |
275 | (void *)(unsigned long)systab64->runtime; | |
276 | tmp |= data ? data->runtime : systab64->runtime; | |
1adbfa35 OJ |
277 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
278 | tmp |= systab64->boottime; | |
279 | efi_systab.nr_tables = systab64->nr_tables; | |
1fec0533 DY |
280 | efi_systab.tables = data ? (unsigned long)data->tables : |
281 | systab64->tables; | |
282 | tmp |= data ? data->tables : systab64->tables; | |
1adbfa35 | 283 | |
abc93f8e | 284 | early_memunmap(systab64, sizeof(*systab64)); |
1fec0533 | 285 | if (data) |
abc93f8e | 286 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
287 | #ifdef CONFIG_X86_32 |
288 | if (tmp >> 32) { | |
289 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
290 | return -EINVAL; | |
291 | } | |
292 | #endif | |
293 | } else { | |
294 | efi_system_table_32_t *systab32; | |
295 | ||
abc93f8e | 296 | systab32 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
297 | sizeof(*systab32)); |
298 | if (systab32 == NULL) { | |
299 | pr_err("Couldn't map the system table!\n"); | |
300 | return -ENOMEM; | |
301 | } | |
302 | ||
303 | efi_systab.hdr = systab32->hdr; | |
304 | efi_systab.fw_vendor = systab32->fw_vendor; | |
305 | efi_systab.fw_revision = systab32->fw_revision; | |
306 | efi_systab.con_in_handle = systab32->con_in_handle; | |
307 | efi_systab.con_in = systab32->con_in; | |
308 | efi_systab.con_out_handle = systab32->con_out_handle; | |
309 | efi_systab.con_out = systab32->con_out; | |
310 | efi_systab.stderr_handle = systab32->stderr_handle; | |
311 | efi_systab.stderr = systab32->stderr; | |
312 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
313 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
314 | efi_systab.nr_tables = systab32->nr_tables; | |
315 | efi_systab.tables = systab32->tables; | |
316 | ||
abc93f8e | 317 | early_memunmap(systab32, sizeof(*systab32)); |
140bf275 | 318 | } |
1adbfa35 | 319 | |
5b83683f HY |
320 | efi.systab = &efi_systab; |
321 | ||
322 | /* | |
323 | * Verify the EFI Table | |
324 | */ | |
140bf275 | 325 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 326 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
327 | return -EINVAL; |
328 | } | |
5b83683f | 329 | if ((efi.systab->hdr.revision >> 16) == 0) |
9b7d2049 | 330 | pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n", |
5b83683f HY |
331 | efi.systab->hdr.revision >> 16, |
332 | efi.systab->hdr.revision & 0xffff); | |
140bf275 OJ |
333 | |
334 | return 0; | |
83e7ee66 | 335 | } |
5b83683f | 336 | |
4f9dbcfc | 337 | static int __init efi_runtime_init32(void) |
83e7ee66 | 338 | { |
4f9dbcfc MF |
339 | efi_runtime_services_32_t *runtime; |
340 | ||
abc93f8e | 341 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc MF |
342 | sizeof(efi_runtime_services_32_t)); |
343 | if (!runtime) { | |
344 | pr_err("Could not map the runtime service table!\n"); | |
345 | return -ENOMEM; | |
346 | } | |
5b83683f HY |
347 | |
348 | /* | |
0ce4605c MK |
349 | * We will only need *early* access to the SetVirtualAddressMap |
350 | * EFI runtime service. All other runtime services will be called | |
351 | * via the virtual mapping. | |
5b83683f | 352 | */ |
4f9dbcfc MF |
353 | efi_phys.set_virtual_address_map = |
354 | (efi_set_virtual_address_map_t *) | |
355 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 356 | early_memunmap(runtime, sizeof(efi_runtime_services_32_t)); |
4f9dbcfc MF |
357 | |
358 | return 0; | |
359 | } | |
360 | ||
361 | static int __init efi_runtime_init64(void) | |
362 | { | |
363 | efi_runtime_services_64_t *runtime; | |
364 | ||
abc93f8e | 365 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc | 366 | sizeof(efi_runtime_services_64_t)); |
140bf275 | 367 | if (!runtime) { |
e3cb3f5a | 368 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
369 | return -ENOMEM; |
370 | } | |
4f9dbcfc | 371 | |
140bf275 | 372 | /* |
0ce4605c MK |
373 | * We will only need *early* access to the SetVirtualAddressMap |
374 | * EFI runtime service. All other runtime services will be called | |
375 | * via the virtual mapping. | |
140bf275 | 376 | */ |
140bf275 | 377 | efi_phys.set_virtual_address_map = |
4f9dbcfc MF |
378 | (efi_set_virtual_address_map_t *) |
379 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 380 | early_memunmap(runtime, sizeof(efi_runtime_services_64_t)); |
4f9dbcfc MF |
381 | |
382 | return 0; | |
383 | } | |
384 | ||
385 | static int __init efi_runtime_init(void) | |
386 | { | |
387 | int rv; | |
388 | ||
389 | /* | |
390 | * Check out the runtime services table. We need to map | |
391 | * the runtime services table so that we can grab the physical | |
392 | * address of several of the EFI runtime functions, needed to | |
393 | * set the firmware into virtual mode. | |
9f27bc54 DK |
394 | * |
395 | * When EFI_PARAVIRT is in force then we could not map runtime | |
396 | * service memory region because we do not have direct access to it. | |
397 | * However, runtime services are available through proxy functions | |
398 | * (e.g. in case of Xen dom0 EFI implementation they call special | |
399 | * hypercall which executes relevant EFI functions) and that is why | |
400 | * they are always enabled. | |
4f9dbcfc | 401 | */ |
4f9dbcfc | 402 | |
9f27bc54 DK |
403 | if (!efi_enabled(EFI_PARAVIRT)) { |
404 | if (efi_enabled(EFI_64BIT)) | |
405 | rv = efi_runtime_init64(); | |
406 | else | |
407 | rv = efi_runtime_init32(); | |
408 | ||
409 | if (rv) | |
410 | return rv; | |
411 | } | |
140bf275 | 412 | |
0f8093a9 MF |
413 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
414 | ||
140bf275 | 415 | return 0; |
83e7ee66 | 416 | } |
5b83683f | 417 | |
140bf275 | 418 | static int __init efi_memmap_init(void) |
83e7ee66 | 419 | { |
884f4f66 MF |
420 | unsigned long addr, size; |
421 | ||
9f27bc54 DK |
422 | if (efi_enabled(EFI_PARAVIRT)) |
423 | return 0; | |
424 | ||
5b83683f | 425 | /* Map the EFI memory map */ |
884f4f66 MF |
426 | size = efi.memmap.nr_map * efi.memmap.desc_size; |
427 | addr = (unsigned long)efi.memmap.phys_map; | |
428 | ||
429 | efi.memmap.map = early_memremap(addr, size); | |
430 | if (efi.memmap.map == NULL) { | |
e3cb3f5a | 431 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
432 | return -ENOMEM; |
433 | } | |
884f4f66 MF |
434 | |
435 | efi.memmap.map_end = efi.memmap.map + size; | |
175e438f | 436 | |
200001eb PJ |
437 | if (add_efi_memmap) |
438 | do_add_efi_memmap(); | |
140bf275 | 439 | |
0f8093a9 MF |
440 | set_bit(EFI_MEMMAP, &efi.flags); |
441 | ||
140bf275 | 442 | return 0; |
83e7ee66 OJ |
443 | } |
444 | ||
445 | void __init efi_init(void) | |
446 | { | |
447 | efi_char16_t *c16; | |
448 | char vendor[100] = "unknown"; | |
449 | int i = 0; | |
450 | void *tmp; | |
451 | ||
452 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
453 | if (boot_params.efi_info.efi_systab_hi || |
454 | boot_params.efi_info.efi_memmap_hi) { | |
455 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
456 | return; |
457 | } | |
83e7ee66 OJ |
458 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
459 | #else | |
460 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
461 | (boot_params.efi_info.efi_systab | |
462 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
463 | #endif |
464 | ||
83e68189 | 465 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 466 | return; |
83e68189 | 467 | |
a0998eb1 DY |
468 | efi.config_table = (unsigned long)efi.systab->tables; |
469 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; | |
470 | efi.runtime = (unsigned long)efi.systab->runtime; | |
471 | ||
83e7ee66 OJ |
472 | /* |
473 | * Show what we know for posterity | |
474 | */ | |
abc93f8e | 475 | c16 = tmp = early_memremap(efi.systab->fw_vendor, 2); |
83e7ee66 OJ |
476 | if (c16) { |
477 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
478 | vendor[i] = *c16++; | |
479 | vendor[i] = '\0'; | |
480 | } else | |
e3cb3f5a | 481 | pr_err("Could not map the firmware vendor!\n"); |
abc93f8e | 482 | early_memunmap(tmp, 2); |
83e7ee66 | 483 | |
e3cb3f5a OJ |
484 | pr_info("EFI v%u.%.02u by %s\n", |
485 | efi.systab->hdr.revision >> 16, | |
486 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 487 | |
1fec0533 DY |
488 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
489 | return; | |
490 | ||
272686bf | 491 | if (efi_config_init(arch_tables)) |
140bf275 | 492 | return; |
83e68189 | 493 | |
1adbfa35 OJ |
494 | /* |
495 | * Note: We currently don't support runtime services on an EFI | |
496 | * that doesn't match the kernel 32/64-bit mode. | |
497 | */ | |
498 | ||
7d453eee | 499 | if (!efi_runtime_supported()) |
1adbfa35 | 500 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 501 | else { |
b2e0a54a | 502 | if (efi_runtime_disabled() || efi_runtime_init()) |
83e68189 | 503 | return; |
140bf275 | 504 | } |
83e68189 | 505 | if (efi_memmap_init()) |
140bf275 | 506 | return; |
83e68189 | 507 | |
fed6cefe | 508 | if (efi_enabled(EFI_DBG)) |
0bbea1ce | 509 | efi_print_memmap(); |
0bb54905 PJ |
510 | |
511 | efi_esrt_init(); | |
5b83683f HY |
512 | } |
513 | ||
2223af38 JT |
514 | void __init efi_late_init(void) |
515 | { | |
516 | efi_bgrt_init(); | |
517 | } | |
518 | ||
9cd2b07c MG |
519 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
520 | { | |
521 | u64 addr, npages; | |
522 | ||
523 | addr = md->virt_addr; | |
524 | npages = md->num_pages; | |
525 | ||
526 | memrange_efi_to_native(&addr, &npages); | |
527 | ||
528 | if (executable) | |
529 | set_memory_x(addr, npages); | |
530 | else | |
531 | set_memory_nx(addr, npages); | |
532 | } | |
533 | ||
c55d016f | 534 | void __init runtime_code_page_mkexec(void) |
a2172e25 HY |
535 | { |
536 | efi_memory_desc_t *md; | |
a2172e25 | 537 | |
a2172e25 | 538 | /* Make EFI runtime service code area executable */ |
78ce248f | 539 | for_each_efi_memory_desc(md) { |
1c083eb2 HY |
540 | if (md->type != EFI_RUNTIME_SERVICES_CODE) |
541 | continue; | |
542 | ||
9cd2b07c | 543 | efi_set_executable(md, true); |
a2172e25 | 544 | } |
a2172e25 | 545 | } |
a2172e25 | 546 | |
4e78eb05 | 547 | void __init efi_memory_uc(u64 addr, unsigned long size) |
3e8fa263 MF |
548 | { |
549 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
550 | u64 npages; | |
551 | ||
552 | npages = round_up(size, page_shift) / page_shift; | |
553 | memrange_efi_to_native(&addr, &npages); | |
554 | set_memory_uc(addr, npages); | |
555 | } | |
556 | ||
d2f7cbe7 BP |
557 | void __init old_map_region(efi_memory_desc_t *md) |
558 | { | |
559 | u64 start_pfn, end_pfn, end; | |
560 | unsigned long size; | |
561 | void *va; | |
562 | ||
563 | start_pfn = PFN_DOWN(md->phys_addr); | |
564 | size = md->num_pages << PAGE_SHIFT; | |
565 | end = md->phys_addr + size; | |
566 | end_pfn = PFN_UP(end); | |
567 | ||
568 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { | |
569 | va = __va(md->phys_addr); | |
570 | ||
571 | if (!(md->attribute & EFI_MEMORY_WB)) | |
572 | efi_memory_uc((u64)(unsigned long)va, size); | |
573 | } else | |
574 | va = efi_ioremap(md->phys_addr, size, | |
575 | md->type, md->attribute); | |
576 | ||
577 | md->virt_addr = (u64) (unsigned long) va; | |
578 | if (!va) | |
579 | pr_err("ioremap of 0x%llX failed!\n", | |
580 | (unsigned long long)md->phys_addr); | |
581 | } | |
582 | ||
481f75c0 DY |
583 | /* Merge contiguous regions of the same type and attribute */ |
584 | static void __init efi_merge_regions(void) | |
5b83683f | 585 | { |
202f9d0a | 586 | efi_memory_desc_t *md, *prev_md = NULL; |
202f9d0a | 587 | |
78ce248f | 588 | for_each_efi_memory_desc(md) { |
202f9d0a | 589 | u64 prev_size; |
202f9d0a MG |
590 | |
591 | if (!prev_md) { | |
592 | prev_md = md; | |
593 | continue; | |
594 | } | |
595 | ||
596 | if (prev_md->type != md->type || | |
597 | prev_md->attribute != md->attribute) { | |
598 | prev_md = md; | |
599 | continue; | |
600 | } | |
601 | ||
602 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
603 | ||
604 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
605 | prev_md->num_pages += md->num_pages; | |
606 | md->type = EFI_RESERVED_TYPE; | |
607 | md->attribute = 0; | |
608 | continue; | |
609 | } | |
610 | prev_md = md; | |
481f75c0 DY |
611 | } |
612 | } | |
613 | ||
614 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) | |
615 | { | |
616 | unsigned long size; | |
617 | u64 end, systab; | |
d2f7cbe7 | 618 | |
481f75c0 DY |
619 | size = md->num_pages << EFI_PAGE_SHIFT; |
620 | end = md->phys_addr + size; | |
621 | systab = (u64)(unsigned long)efi_phys.systab; | |
622 | if (md->phys_addr <= systab && systab < end) { | |
623 | systab += md->virt_addr - md->phys_addr; | |
624 | efi.systab = (efi_system_table_t *)(unsigned long)systab; | |
202f9d0a | 625 | } |
481f75c0 DY |
626 | } |
627 | ||
fabb37c7 | 628 | static void __init save_runtime_map(void) |
926172d4 | 629 | { |
2965faa5 | 630 | #ifdef CONFIG_KEXEC_CORE |
884f4f66 | 631 | unsigned long desc_size; |
926172d4 | 632 | efi_memory_desc_t *md; |
78ce248f | 633 | void *tmp, *q = NULL; |
926172d4 DY |
634 | int count = 0; |
635 | ||
a3530e8f DY |
636 | if (efi_enabled(EFI_OLD_MEMMAP)) |
637 | return; | |
638 | ||
884f4f66 MF |
639 | desc_size = efi.memmap.desc_size; |
640 | ||
78ce248f | 641 | for_each_efi_memory_desc(md) { |
926172d4 DY |
642 | if (!(md->attribute & EFI_MEMORY_RUNTIME) || |
643 | (md->type == EFI_BOOT_SERVICES_CODE) || | |
644 | (md->type == EFI_BOOT_SERVICES_DATA)) | |
645 | continue; | |
884f4f66 | 646 | tmp = krealloc(q, (count + 1) * desc_size, GFP_KERNEL); |
926172d4 DY |
647 | if (!tmp) |
648 | goto out; | |
649 | q = tmp; | |
650 | ||
884f4f66 | 651 | memcpy(q + count * desc_size, md, desc_size); |
926172d4 DY |
652 | count++; |
653 | } | |
654 | ||
884f4f66 | 655 | efi_runtime_map_setup(q, count, desc_size); |
fabb37c7 | 656 | return; |
926172d4 | 657 | |
926172d4 DY |
658 | out: |
659 | kfree(q); | |
fabb37c7 BP |
660 | pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n"); |
661 | #endif | |
1fec0533 DY |
662 | } |
663 | ||
b7b898ae BP |
664 | static void *realloc_pages(void *old_memmap, int old_shift) |
665 | { | |
666 | void *ret; | |
667 | ||
668 | ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1); | |
669 | if (!ret) | |
670 | goto out; | |
671 | ||
672 | /* | |
673 | * A first-time allocation doesn't have anything to copy. | |
674 | */ | |
675 | if (!old_memmap) | |
676 | return ret; | |
677 | ||
678 | memcpy(ret, old_memmap, PAGE_SIZE << old_shift); | |
679 | ||
680 | out: | |
681 | free_pages((unsigned long)old_memmap, old_shift); | |
682 | return ret; | |
683 | } | |
684 | ||
a5caa209 MF |
685 | /* |
686 | * Iterate the EFI memory map in reverse order because the regions | |
687 | * will be mapped top-down. The end result is the same as if we had | |
688 | * mapped things forward, but doesn't require us to change the | |
689 | * existing implementation of efi_map_region(). | |
690 | */ | |
691 | static inline void *efi_map_next_entry_reverse(void *entry) | |
692 | { | |
693 | /* Initial call */ | |
694 | if (!entry) | |
884f4f66 | 695 | return efi.memmap.map_end - efi.memmap.desc_size; |
a5caa209 | 696 | |
884f4f66 MF |
697 | entry -= efi.memmap.desc_size; |
698 | if (entry < efi.memmap.map) | |
a5caa209 MF |
699 | return NULL; |
700 | ||
701 | return entry; | |
702 | } | |
703 | ||
704 | /* | |
705 | * efi_map_next_entry - Return the next EFI memory map descriptor | |
706 | * @entry: Previous EFI memory map descriptor | |
707 | * | |
708 | * This is a helper function to iterate over the EFI memory map, which | |
709 | * we do in different orders depending on the current configuration. | |
710 | * | |
711 | * To begin traversing the memory map @entry must be %NULL. | |
712 | * | |
713 | * Returns %NULL when we reach the end of the memory map. | |
714 | */ | |
715 | static void *efi_map_next_entry(void *entry) | |
716 | { | |
717 | if (!efi_enabled(EFI_OLD_MEMMAP) && efi_enabled(EFI_64BIT)) { | |
718 | /* | |
719 | * Starting in UEFI v2.5 the EFI_PROPERTIES_TABLE | |
720 | * config table feature requires us to map all entries | |
721 | * in the same order as they appear in the EFI memory | |
722 | * map. That is to say, entry N must have a lower | |
723 | * virtual address than entry N+1. This is because the | |
724 | * firmware toolchain leaves relative references in | |
725 | * the code/data sections, which are split and become | |
726 | * separate EFI memory regions. Mapping things | |
727 | * out-of-order leads to the firmware accessing | |
728 | * unmapped addresses. | |
729 | * | |
730 | * Since we need to map things this way whether or not | |
731 | * the kernel actually makes use of | |
732 | * EFI_PROPERTIES_TABLE, let's just switch to this | |
733 | * scheme by default for 64-bit. | |
734 | */ | |
735 | return efi_map_next_entry_reverse(entry); | |
736 | } | |
737 | ||
738 | /* Initial call */ | |
739 | if (!entry) | |
884f4f66 | 740 | return efi.memmap.map; |
a5caa209 | 741 | |
884f4f66 MF |
742 | entry += efi.memmap.desc_size; |
743 | if (entry >= efi.memmap.map_end) | |
a5caa209 MF |
744 | return NULL; |
745 | ||
746 | return entry; | |
747 | } | |
748 | ||
481f75c0 | 749 | /* |
b7b898ae BP |
750 | * Map the efi memory ranges of the runtime services and update new_mmap with |
751 | * virtual addresses. | |
481f75c0 | 752 | */ |
b7b898ae | 753 | static void * __init efi_map_regions(int *count, int *pg_shift) |
481f75c0 | 754 | { |
b7b898ae BP |
755 | void *p, *new_memmap = NULL; |
756 | unsigned long left = 0; | |
884f4f66 | 757 | unsigned long desc_size; |
481f75c0 | 758 | efi_memory_desc_t *md; |
202f9d0a | 759 | |
884f4f66 MF |
760 | desc_size = efi.memmap.desc_size; |
761 | ||
a5caa209 MF |
762 | p = NULL; |
763 | while ((p = efi_map_next_entry(p))) { | |
5b83683f | 764 | md = p; |
70087011 JB |
765 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) { |
766 | #ifdef CONFIG_X86_64 | |
767 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
768 | md->type != EFI_BOOT_SERVICES_DATA) | |
769 | #endif | |
770 | continue; | |
771 | } | |
1c083eb2 | 772 | |
d2f7cbe7 | 773 | efi_map_region(md); |
481f75c0 DY |
774 | get_systab_virt_addr(md); |
775 | ||
884f4f66 | 776 | if (left < desc_size) { |
b7b898ae BP |
777 | new_memmap = realloc_pages(new_memmap, *pg_shift); |
778 | if (!new_memmap) | |
779 | return NULL; | |
780 | ||
781 | left += PAGE_SIZE << *pg_shift; | |
782 | (*pg_shift)++; | |
783 | } | |
784 | ||
884f4f66 | 785 | memcpy(new_memmap + (*count * desc_size), md, desc_size); |
b7b898ae | 786 | |
884f4f66 | 787 | left -= desc_size; |
481f75c0 DY |
788 | (*count)++; |
789 | } | |
d2f7cbe7 | 790 | |
481f75c0 | 791 | return new_memmap; |
481f75c0 DY |
792 | } |
793 | ||
fabb37c7 BP |
794 | static void __init kexec_enter_virtual_mode(void) |
795 | { | |
2965faa5 | 796 | #ifdef CONFIG_KEXEC_CORE |
fabb37c7 | 797 | efi_memory_desc_t *md; |
753b11ef | 798 | unsigned int num_pages; |
fabb37c7 BP |
799 | |
800 | efi.systab = NULL; | |
801 | ||
802 | /* | |
803 | * We don't do virtual mode, since we don't do runtime services, on | |
804 | * non-native EFI | |
805 | */ | |
806 | if (!efi_is_native()) { | |
807 | efi_unmap_memmap(); | |
a5a750a9 | 808 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 BP |
809 | return; |
810 | } | |
811 | ||
753b11ef MF |
812 | if (efi_alloc_page_tables()) { |
813 | pr_err("Failed to allocate EFI page tables\n"); | |
814 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
815 | return; | |
816 | } | |
817 | ||
fabb37c7 BP |
818 | /* |
819 | * Map efi regions which were passed via setup_data. The virt_addr is a | |
820 | * fixed addr which was used in first kernel of a kexec boot. | |
821 | */ | |
78ce248f | 822 | for_each_efi_memory_desc(md) { |
fabb37c7 BP |
823 | efi_map_region_fixed(md); /* FIXME: add error handling */ |
824 | get_systab_virt_addr(md); | |
825 | } | |
826 | ||
827 | save_runtime_map(); | |
828 | ||
829 | BUG_ON(!efi.systab); | |
830 | ||
884f4f66 | 831 | num_pages = ALIGN(efi.memmap.nr_map * efi.memmap.desc_size, PAGE_SIZE); |
753b11ef MF |
832 | num_pages >>= PAGE_SHIFT; |
833 | ||
884f4f66 | 834 | if (efi_setup_page_tables(efi.memmap.phys_map, num_pages)) { |
753b11ef MF |
835 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
836 | return; | |
837 | } | |
838 | ||
fabb37c7 BP |
839 | efi_sync_low_kernel_mappings(); |
840 | ||
841 | /* | |
842 | * Now that EFI is in virtual mode, update the function | |
843 | * pointers in the runtime service table to the new virtual addresses. | |
844 | * | |
845 | * Call EFI services through wrapper functions. | |
846 | */ | |
847 | efi.runtime_version = efi_systab.hdr.revision; | |
994448f1 | 848 | |
022ee6c5 | 849 | efi_native_runtime_setup(); |
994448f1 | 850 | |
fabb37c7 | 851 | efi.set_virtual_address_map = NULL; |
fabb37c7 BP |
852 | |
853 | if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX)) | |
854 | runtime_code_page_mkexec(); | |
855 | ||
856 | /* clean DUMMY object */ | |
eeb9db09 | 857 | efi_delete_dummy_variable(); |
fabb37c7 BP |
858 | #endif |
859 | } | |
860 | ||
481f75c0 DY |
861 | /* |
862 | * This function will switch the EFI runtime services to virtual mode. | |
863 | * Essentially, we look through the EFI memmap and map every region that | |
864 | * has the runtime attribute bit set in its memory descriptor into the | |
67a9108e | 865 | * efi_pgd page table. |
481f75c0 DY |
866 | * |
867 | * The old method which used to update that memory descriptor with the | |
868 | * virtual address obtained from ioremap() is still supported when the | |
869 | * kernel is booted with efi=old_map on its command line. Same old | |
870 | * method enabled the runtime services to be called without having to | |
871 | * thunk back into physical mode for every invocation. | |
872 | * | |
873 | * The new method does a pagetable switch in a preemption-safe manner | |
874 | * so that we're in a different address space when calling a runtime | |
67a9108e MF |
875 | * function. For function arguments passing we do copy the PUDs of the |
876 | * kernel page table into efi_pgd prior to each call. | |
1fec0533 DY |
877 | * |
878 | * Specially for kexec boot, efi runtime maps in previous kernel should | |
879 | * be passed in via setup_data. In that case runtime ranges will be mapped | |
fabb37c7 BP |
880 | * to the same virtual addresses as the first kernel, see |
881 | * kexec_enter_virtual_mode(). | |
481f75c0 | 882 | */ |
fabb37c7 | 883 | static void __init __efi_enter_virtual_mode(void) |
481f75c0 | 884 | { |
fabb37c7 | 885 | int count = 0, pg_shift = 0; |
481f75c0 | 886 | void *new_memmap = NULL; |
b7b898ae | 887 | efi_status_t status; |
1c083eb2 | 888 | |
481f75c0 | 889 | efi.systab = NULL; |
d2f7cbe7 | 890 | |
67a9108e MF |
891 | if (efi_alloc_page_tables()) { |
892 | pr_err("Failed to allocate EFI page tables\n"); | |
893 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
894 | return; | |
895 | } | |
896 | ||
fabb37c7 BP |
897 | efi_merge_regions(); |
898 | new_memmap = efi_map_regions(&count, &pg_shift); | |
899 | if (!new_memmap) { | |
900 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); | |
a5a750a9 | 901 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 | 902 | return; |
b7b898ae | 903 | } |
926172d4 | 904 | |
fabb37c7 BP |
905 | save_runtime_map(); |
906 | ||
5b83683f HY |
907 | BUG_ON(!efi.systab); |
908 | ||
a5a750a9 DY |
909 | if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) { |
910 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
fabb37c7 | 911 | return; |
a5a750a9 | 912 | } |
b7b898ae | 913 | |
d2f7cbe7 BP |
914 | efi_sync_low_kernel_mappings(); |
915 | ||
994448f1 MF |
916 | if (efi_is_native()) { |
917 | status = phys_efi_set_virtual_address_map( | |
884f4f66 MF |
918 | efi.memmap.desc_size * count, |
919 | efi.memmap.desc_size, | |
920 | efi.memmap.desc_version, | |
994448f1 MF |
921 | (efi_memory_desc_t *)__pa(new_memmap)); |
922 | } else { | |
923 | status = efi_thunk_set_virtual_address_map( | |
924 | efi_phys.set_virtual_address_map, | |
884f4f66 MF |
925 | efi.memmap.desc_size * count, |
926 | efi.memmap.desc_size, | |
927 | efi.memmap.desc_version, | |
994448f1 MF |
928 | (efi_memory_desc_t *)__pa(new_memmap)); |
929 | } | |
1fec0533 | 930 | |
fabb37c7 BP |
931 | if (status != EFI_SUCCESS) { |
932 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", | |
933 | status); | |
934 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
5b83683f HY |
935 | } |
936 | ||
937 | /* | |
938 | * Now that EFI is in virtual mode, update the function | |
939 | * pointers in the runtime service table to the new virtual addresses. | |
940 | * | |
941 | * Call EFI services through wrapper functions. | |
942 | */ | |
712ba9e9 | 943 | efi.runtime_version = efi_systab.hdr.revision; |
4f9dbcfc MF |
944 | |
945 | if (efi_is_native()) | |
022ee6c5 | 946 | efi_native_runtime_setup(); |
4f9dbcfc MF |
947 | else |
948 | efi_thunk_runtime_setup(); | |
949 | ||
2b5e8ef3 | 950 | efi.set_virtual_address_map = NULL; |
d2f7cbe7 | 951 | |
6d0cc887 SP |
952 | /* |
953 | * Apply more restrictive page table mapping attributes now that | |
954 | * SVAM() has been called and the firmware has performed all | |
955 | * necessary relocation fixups for the new virtual addresses. | |
956 | */ | |
957 | efi_runtime_update_mappings(); | |
958 | efi_dump_pagetable(); | |
1adbfa35 | 959 | |
b7b898ae | 960 | /* |
67a9108e MF |
961 | * We mapped the descriptor array into the EFI pagetable above |
962 | * but we're not unmapping it here because if we're running in | |
963 | * EFI mixed mode we need all of memory to be accessible when | |
964 | * we pass parameters to the EFI runtime services in the | |
965 | * thunking code. | |
b7b898ae | 966 | */ |
fabb37c7 | 967 | free_pages((unsigned long)new_memmap, pg_shift); |
f8b84043 MG |
968 | |
969 | /* clean DUMMY object */ | |
eeb9db09 | 970 | efi_delete_dummy_variable(); |
5b83683f HY |
971 | } |
972 | ||
fabb37c7 BP |
973 | void __init efi_enter_virtual_mode(void) |
974 | { | |
9f27bc54 DK |
975 | if (efi_enabled(EFI_PARAVIRT)) |
976 | return; | |
977 | ||
fabb37c7 BP |
978 | if (efi_setup) |
979 | kexec_enter_virtual_mode(); | |
980 | else | |
981 | __efi_enter_virtual_mode(); | |
982 | } | |
983 | ||
5b83683f HY |
984 | /* |
985 | * Convenience functions to obtain memory types and attributes | |
986 | */ | |
987 | u32 efi_mem_type(unsigned long phys_addr) | |
988 | { | |
989 | efi_memory_desc_t *md; | |
5b83683f | 990 | |
83e68189 MF |
991 | if (!efi_enabled(EFI_MEMMAP)) |
992 | return 0; | |
993 | ||
78ce248f | 994 | for_each_efi_memory_desc(md) { |
5b83683f HY |
995 | if ((md->phys_addr <= phys_addr) && |
996 | (phys_addr < (md->phys_addr + | |
997 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
998 | return md->type; | |
999 | } | |
1000 | return 0; | |
1001 | } | |
1002 | ||
5ae3683c | 1003 | static int __init arch_parse_efi_cmdline(char *str) |
d2f7cbe7 | 1004 | { |
9115c758 RN |
1005 | if (!str) { |
1006 | pr_warn("need at least one option\n"); | |
1007 | return -EINVAL; | |
1008 | } | |
1009 | ||
6ccc72b8 DY |
1010 | if (parse_option_str(str, "old_map")) |
1011 | set_bit(EFI_OLD_MEMMAP, &efi.flags); | |
d2f7cbe7 BP |
1012 | |
1013 | return 0; | |
1014 | } | |
5ae3683c | 1015 | early_param("efi", arch_parse_efi_cmdline); |