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 | |
f4fccac0 | 57 | #define EFI_DEBUG |
5b83683f | 58 | |
5b83683f HY |
59 | struct efi_memory_map memmap; |
60 | ||
ecaea42e | 61 | static struct efi efi_phys __initdata; |
5b83683f HY |
62 | static efi_system_table_t efi_systab __initdata; |
63 | ||
9b7d2049 | 64 | static efi_config_table_type_t arch_tables[] __initdata = { |
272686bf LL |
65 | #ifdef CONFIG_X86_UV |
66 | {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab}, | |
67 | #endif | |
722da9d2 | 68 | {NULL_GUID, NULL, NULL}, |
272686bf LL |
69 | }; |
70 | ||
1fec0533 | 71 | u64 efi_setup; /* efi setup_data physical address */ |
926172d4 | 72 | |
60920685 | 73 | static int add_efi_memmap __initdata; |
200001eb PJ |
74 | static int __init setup_add_efi_memmap(char *arg) |
75 | { | |
76 | add_efi_memmap = 1; | |
77 | return 0; | |
78 | } | |
79 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
80 | ||
5b83683f HY |
81 | static efi_status_t __init phys_efi_set_virtual_address_map( |
82 | unsigned long memory_map_size, | |
83 | unsigned long descriptor_size, | |
84 | u32 descriptor_version, | |
85 | efi_memory_desc_t *virtual_map) | |
86 | { | |
87 | efi_status_t status; | |
23a0d4e8 | 88 | unsigned long flags; |
744937b0 | 89 | pgd_t *save_pgd; |
5b83683f | 90 | |
744937b0 | 91 | save_pgd = efi_call_phys_prolog(); |
23a0d4e8 IM |
92 | |
93 | /* Disable interrupts around EFI calls: */ | |
94 | local_irq_save(flags); | |
62fa6e69 MF |
95 | status = efi_call_phys(efi_phys.set_virtual_address_map, |
96 | memory_map_size, descriptor_size, | |
97 | descriptor_version, virtual_map); | |
23a0d4e8 IM |
98 | local_irq_restore(flags); |
99 | ||
744937b0 | 100 | efi_call_phys_epilog(save_pgd); |
23a0d4e8 | 101 | |
5b83683f HY |
102 | return status; |
103 | } | |
104 | ||
3565184e | 105 | void efi_get_time(struct timespec *now) |
5b83683f HY |
106 | { |
107 | efi_status_t status; | |
108 | efi_time_t eft; | |
109 | efi_time_cap_t cap; | |
110 | ||
111 | status = efi.get_time(&eft, &cap); | |
112 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 113 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f | 114 | |
3565184e DV |
115 | now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour, |
116 | eft.minute, eft.second); | |
117 | now->tv_nsec = 0; | |
5b83683f HY |
118 | } |
119 | ||
b05b9f5f TL |
120 | void __init efi_find_mirror(void) |
121 | { | |
122 | void *p; | |
123 | u64 mirror_size = 0, total_size = 0; | |
124 | ||
125 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
126 | efi_memory_desc_t *md = p; | |
127 | unsigned long long start = md->phys_addr; | |
128 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
129 | ||
130 | total_size += size; | |
131 | if (md->attribute & EFI_MEMORY_MORE_RELIABLE) { | |
132 | memblock_mark_mirror(start, size); | |
133 | mirror_size += size; | |
134 | } | |
135 | } | |
136 | if (mirror_size) | |
137 | pr_info("Memory: %lldM/%lldM mirrored memory\n", | |
138 | mirror_size>>20, total_size>>20); | |
139 | } | |
140 | ||
69c91893 PJ |
141 | /* |
142 | * Tell the kernel about the EFI memory map. This might include | |
143 | * more than the max 128 entries that can fit in the e820 legacy | |
144 | * (zeropage) memory map. | |
145 | */ | |
146 | ||
200001eb | 147 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
148 | { |
149 | void *p; | |
150 | ||
151 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
152 | efi_memory_desc_t *md = p; | |
153 | unsigned long long start = md->phys_addr; | |
154 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
155 | int e820_type; | |
156 | ||
e2a71476 CW |
157 | switch (md->type) { |
158 | case EFI_LOADER_CODE: | |
159 | case EFI_LOADER_DATA: | |
160 | case EFI_BOOT_SERVICES_CODE: | |
161 | case EFI_BOOT_SERVICES_DATA: | |
162 | case EFI_CONVENTIONAL_MEMORY: | |
163 | if (md->attribute & EFI_MEMORY_WB) | |
164 | e820_type = E820_RAM; | |
165 | else | |
166 | e820_type = E820_RESERVED; | |
167 | break; | |
168 | case EFI_ACPI_RECLAIM_MEMORY: | |
169 | e820_type = E820_ACPI; | |
170 | break; | |
171 | case EFI_ACPI_MEMORY_NVS: | |
172 | e820_type = E820_NVS; | |
173 | break; | |
174 | case EFI_UNUSABLE_MEMORY: | |
175 | e820_type = E820_UNUSABLE; | |
176 | break; | |
ad5fb870 DW |
177 | case EFI_PERSISTENT_MEMORY: |
178 | e820_type = E820_PMEM; | |
179 | break; | |
e2a71476 CW |
180 | default: |
181 | /* | |
182 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
183 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
184 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
185 | */ | |
69c91893 | 186 | e820_type = E820_RESERVED; |
e2a71476 CW |
187 | break; |
188 | } | |
d0be6bde | 189 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
190 | } |
191 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
192 | } | |
193 | ||
1adbfa35 | 194 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 195 | { |
15b9c359 | 196 | struct efi_info *e = &boot_params.efi_info; |
44511fb9 | 197 | phys_addr_t pmap; |
ecacf09f | 198 | |
9f27bc54 DK |
199 | if (efi_enabled(EFI_PARAVIRT)) |
200 | return 0; | |
201 | ||
05486fa7 | 202 | #ifdef CONFIG_X86_32 |
1adbfa35 | 203 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 204 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
205 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
206 | return -EINVAL; | |
207 | } | |
15b9c359 | 208 | pmap = e->efi_memmap; |
05486fa7 | 209 | #else |
15b9c359 | 210 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 211 | #endif |
44511fb9 | 212 | memmap.phys_map = pmap; |
15b9c359 BP |
213 | memmap.nr_map = e->efi_memmap_size / |
214 | e->efi_memdesc_size; | |
215 | memmap.desc_size = e->efi_memdesc_size; | |
216 | memmap.desc_version = e->efi_memdesc_version; | |
217 | ||
24aa0788 | 218 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
1adbfa35 | 219 | |
258f6fd7 LL |
220 | efi.memmap = &memmap; |
221 | ||
1adbfa35 | 222 | return 0; |
ecacf09f HY |
223 | } |
224 | ||
0bbea1ce | 225 | void __init efi_print_memmap(void) |
5b83683f | 226 | { |
f4fccac0 | 227 | #ifdef EFI_DEBUG |
5b83683f HY |
228 | efi_memory_desc_t *md; |
229 | void *p; | |
230 | int i; | |
231 | ||
232 | for (p = memmap.map, i = 0; | |
233 | p < memmap.map_end; | |
234 | p += memmap.desc_size, i++) { | |
ace1d121 LE |
235 | char buf[64]; |
236 | ||
5b83683f | 237 | md = p; |
1e82b947 | 238 | pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n", |
ace1d121 LE |
239 | i, efi_md_typeattr_format(buf, sizeof(buf), md), |
240 | md->phys_addr, | |
1e82b947 | 241 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1, |
5b83683f HY |
242 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); |
243 | } | |
5b83683f | 244 | #endif /* EFI_DEBUG */ |
f4fccac0 | 245 | } |
5b83683f | 246 | |
5189c2a7 | 247 | void __init efi_unmap_memmap(void) |
78510792 | 248 | { |
3e909599 | 249 | clear_bit(EFI_MEMMAP, &efi.flags); |
78510792 | 250 | if (memmap.map) { |
abc93f8e | 251 | early_memunmap(memmap.map, memmap.nr_map * memmap.desc_size); |
78510792 JT |
252 | memmap.map = NULL; |
253 | } | |
254 | } | |
255 | ||
140bf275 | 256 | static int __init efi_systab_init(void *phys) |
5b83683f | 257 | { |
83e68189 | 258 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 | 259 | efi_system_table_64_t *systab64; |
1fec0533 | 260 | struct efi_setup_data *data = NULL; |
1adbfa35 OJ |
261 | u64 tmp = 0; |
262 | ||
1fec0533 DY |
263 | if (efi_setup) { |
264 | data = early_memremap(efi_setup, sizeof(*data)); | |
265 | if (!data) | |
266 | return -ENOMEM; | |
267 | } | |
abc93f8e | 268 | systab64 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
269 | sizeof(*systab64)); |
270 | if (systab64 == NULL) { | |
271 | pr_err("Couldn't map the system table!\n"); | |
1fec0533 | 272 | if (data) |
abc93f8e | 273 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
274 | return -ENOMEM; |
275 | } | |
276 | ||
277 | efi_systab.hdr = systab64->hdr; | |
1fec0533 DY |
278 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
279 | systab64->fw_vendor; | |
280 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; | |
1adbfa35 OJ |
281 | efi_systab.fw_revision = systab64->fw_revision; |
282 | efi_systab.con_in_handle = systab64->con_in_handle; | |
283 | tmp |= systab64->con_in_handle; | |
284 | efi_systab.con_in = systab64->con_in; | |
285 | tmp |= systab64->con_in; | |
286 | efi_systab.con_out_handle = systab64->con_out_handle; | |
287 | tmp |= systab64->con_out_handle; | |
288 | efi_systab.con_out = systab64->con_out; | |
289 | tmp |= systab64->con_out; | |
290 | efi_systab.stderr_handle = systab64->stderr_handle; | |
291 | tmp |= systab64->stderr_handle; | |
292 | efi_systab.stderr = systab64->stderr; | |
293 | tmp |= systab64->stderr; | |
1fec0533 DY |
294 | efi_systab.runtime = data ? |
295 | (void *)(unsigned long)data->runtime : | |
296 | (void *)(unsigned long)systab64->runtime; | |
297 | tmp |= data ? data->runtime : systab64->runtime; | |
1adbfa35 OJ |
298 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
299 | tmp |= systab64->boottime; | |
300 | efi_systab.nr_tables = systab64->nr_tables; | |
1fec0533 DY |
301 | efi_systab.tables = data ? (unsigned long)data->tables : |
302 | systab64->tables; | |
303 | tmp |= data ? data->tables : systab64->tables; | |
1adbfa35 | 304 | |
abc93f8e | 305 | early_memunmap(systab64, sizeof(*systab64)); |
1fec0533 | 306 | if (data) |
abc93f8e | 307 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
308 | #ifdef CONFIG_X86_32 |
309 | if (tmp >> 32) { | |
310 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
311 | return -EINVAL; | |
312 | } | |
313 | #endif | |
314 | } else { | |
315 | efi_system_table_32_t *systab32; | |
316 | ||
abc93f8e | 317 | systab32 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
318 | sizeof(*systab32)); |
319 | if (systab32 == NULL) { | |
320 | pr_err("Couldn't map the system table!\n"); | |
321 | return -ENOMEM; | |
322 | } | |
323 | ||
324 | efi_systab.hdr = systab32->hdr; | |
325 | efi_systab.fw_vendor = systab32->fw_vendor; | |
326 | efi_systab.fw_revision = systab32->fw_revision; | |
327 | efi_systab.con_in_handle = systab32->con_in_handle; | |
328 | efi_systab.con_in = systab32->con_in; | |
329 | efi_systab.con_out_handle = systab32->con_out_handle; | |
330 | efi_systab.con_out = systab32->con_out; | |
331 | efi_systab.stderr_handle = systab32->stderr_handle; | |
332 | efi_systab.stderr = systab32->stderr; | |
333 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
334 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
335 | efi_systab.nr_tables = systab32->nr_tables; | |
336 | efi_systab.tables = systab32->tables; | |
337 | ||
abc93f8e | 338 | early_memunmap(systab32, sizeof(*systab32)); |
140bf275 | 339 | } |
1adbfa35 | 340 | |
5b83683f HY |
341 | efi.systab = &efi_systab; |
342 | ||
343 | /* | |
344 | * Verify the EFI Table | |
345 | */ | |
140bf275 | 346 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 347 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
348 | return -EINVAL; |
349 | } | |
5b83683f | 350 | if ((efi.systab->hdr.revision >> 16) == 0) |
9b7d2049 | 351 | pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n", |
5b83683f HY |
352 | efi.systab->hdr.revision >> 16, |
353 | efi.systab->hdr.revision & 0xffff); | |
140bf275 OJ |
354 | |
355 | return 0; | |
83e7ee66 | 356 | } |
5b83683f | 357 | |
4f9dbcfc | 358 | static int __init efi_runtime_init32(void) |
83e7ee66 | 359 | { |
4f9dbcfc MF |
360 | efi_runtime_services_32_t *runtime; |
361 | ||
abc93f8e | 362 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc MF |
363 | sizeof(efi_runtime_services_32_t)); |
364 | if (!runtime) { | |
365 | pr_err("Could not map the runtime service table!\n"); | |
366 | return -ENOMEM; | |
367 | } | |
5b83683f HY |
368 | |
369 | /* | |
0ce4605c MK |
370 | * We will only need *early* access to the SetVirtualAddressMap |
371 | * EFI runtime service. All other runtime services will be called | |
372 | * via the virtual mapping. | |
5b83683f | 373 | */ |
4f9dbcfc MF |
374 | efi_phys.set_virtual_address_map = |
375 | (efi_set_virtual_address_map_t *) | |
376 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 377 | early_memunmap(runtime, sizeof(efi_runtime_services_32_t)); |
4f9dbcfc MF |
378 | |
379 | return 0; | |
380 | } | |
381 | ||
382 | static int __init efi_runtime_init64(void) | |
383 | { | |
384 | efi_runtime_services_64_t *runtime; | |
385 | ||
abc93f8e | 386 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc | 387 | sizeof(efi_runtime_services_64_t)); |
140bf275 | 388 | if (!runtime) { |
e3cb3f5a | 389 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
390 | return -ENOMEM; |
391 | } | |
4f9dbcfc | 392 | |
140bf275 | 393 | /* |
0ce4605c MK |
394 | * We will only need *early* access to the SetVirtualAddressMap |
395 | * EFI runtime service. All other runtime services will be called | |
396 | * via the virtual mapping. | |
140bf275 | 397 | */ |
140bf275 | 398 | efi_phys.set_virtual_address_map = |
4f9dbcfc MF |
399 | (efi_set_virtual_address_map_t *) |
400 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 401 | early_memunmap(runtime, sizeof(efi_runtime_services_64_t)); |
4f9dbcfc MF |
402 | |
403 | return 0; | |
404 | } | |
405 | ||
406 | static int __init efi_runtime_init(void) | |
407 | { | |
408 | int rv; | |
409 | ||
410 | /* | |
411 | * Check out the runtime services table. We need to map | |
412 | * the runtime services table so that we can grab the physical | |
413 | * address of several of the EFI runtime functions, needed to | |
414 | * set the firmware into virtual mode. | |
9f27bc54 DK |
415 | * |
416 | * When EFI_PARAVIRT is in force then we could not map runtime | |
417 | * service memory region because we do not have direct access to it. | |
418 | * However, runtime services are available through proxy functions | |
419 | * (e.g. in case of Xen dom0 EFI implementation they call special | |
420 | * hypercall which executes relevant EFI functions) and that is why | |
421 | * they are always enabled. | |
4f9dbcfc | 422 | */ |
4f9dbcfc | 423 | |
9f27bc54 DK |
424 | if (!efi_enabled(EFI_PARAVIRT)) { |
425 | if (efi_enabled(EFI_64BIT)) | |
426 | rv = efi_runtime_init64(); | |
427 | else | |
428 | rv = efi_runtime_init32(); | |
429 | ||
430 | if (rv) | |
431 | return rv; | |
432 | } | |
140bf275 | 433 | |
0f8093a9 MF |
434 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
435 | ||
140bf275 | 436 | return 0; |
83e7ee66 | 437 | } |
5b83683f | 438 | |
140bf275 | 439 | static int __init efi_memmap_init(void) |
83e7ee66 | 440 | { |
9f27bc54 DK |
441 | if (efi_enabled(EFI_PARAVIRT)) |
442 | return 0; | |
443 | ||
5b83683f | 444 | /* Map the EFI memory map */ |
abc93f8e | 445 | memmap.map = early_memremap((unsigned long)memmap.phys_map, |
beacfaac | 446 | memmap.nr_map * memmap.desc_size); |
140bf275 | 447 | if (memmap.map == NULL) { |
e3cb3f5a | 448 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
449 | return -ENOMEM; |
450 | } | |
5b83683f | 451 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 452 | |
200001eb PJ |
453 | if (add_efi_memmap) |
454 | do_add_efi_memmap(); | |
140bf275 | 455 | |
0f8093a9 MF |
456 | set_bit(EFI_MEMMAP, &efi.flags); |
457 | ||
140bf275 | 458 | return 0; |
83e7ee66 OJ |
459 | } |
460 | ||
461 | void __init efi_init(void) | |
462 | { | |
463 | efi_char16_t *c16; | |
464 | char vendor[100] = "unknown"; | |
465 | int i = 0; | |
466 | void *tmp; | |
467 | ||
468 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
469 | if (boot_params.efi_info.efi_systab_hi || |
470 | boot_params.efi_info.efi_memmap_hi) { | |
471 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
472 | return; |
473 | } | |
83e7ee66 OJ |
474 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
475 | #else | |
476 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
477 | (boot_params.efi_info.efi_systab | |
478 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
479 | #endif |
480 | ||
83e68189 | 481 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 482 | return; |
83e68189 | 483 | |
a0998eb1 DY |
484 | efi.config_table = (unsigned long)efi.systab->tables; |
485 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; | |
486 | efi.runtime = (unsigned long)efi.systab->runtime; | |
487 | ||
83e7ee66 OJ |
488 | /* |
489 | * Show what we know for posterity | |
490 | */ | |
abc93f8e | 491 | c16 = tmp = early_memremap(efi.systab->fw_vendor, 2); |
83e7ee66 OJ |
492 | if (c16) { |
493 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
494 | vendor[i] = *c16++; | |
495 | vendor[i] = '\0'; | |
496 | } else | |
e3cb3f5a | 497 | pr_err("Could not map the firmware vendor!\n"); |
abc93f8e | 498 | early_memunmap(tmp, 2); |
83e7ee66 | 499 | |
e3cb3f5a OJ |
500 | pr_info("EFI v%u.%.02u by %s\n", |
501 | efi.systab->hdr.revision >> 16, | |
502 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 503 | |
1fec0533 DY |
504 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
505 | return; | |
506 | ||
272686bf | 507 | if (efi_config_init(arch_tables)) |
140bf275 | 508 | return; |
83e68189 | 509 | |
1adbfa35 OJ |
510 | /* |
511 | * Note: We currently don't support runtime services on an EFI | |
512 | * that doesn't match the kernel 32/64-bit mode. | |
513 | */ | |
514 | ||
7d453eee | 515 | if (!efi_runtime_supported()) |
1adbfa35 | 516 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 517 | else { |
b2e0a54a | 518 | if (efi_runtime_disabled() || efi_runtime_init()) |
83e68189 | 519 | return; |
140bf275 | 520 | } |
83e68189 | 521 | if (efi_memmap_init()) |
140bf275 | 522 | return; |
83e68189 | 523 | |
fed6cefe | 524 | if (efi_enabled(EFI_DBG)) |
0bbea1ce | 525 | efi_print_memmap(); |
0bb54905 PJ |
526 | |
527 | efi_esrt_init(); | |
5b83683f HY |
528 | } |
529 | ||
2223af38 JT |
530 | void __init efi_late_init(void) |
531 | { | |
532 | efi_bgrt_init(); | |
533 | } | |
534 | ||
9cd2b07c MG |
535 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
536 | { | |
537 | u64 addr, npages; | |
538 | ||
539 | addr = md->virt_addr; | |
540 | npages = md->num_pages; | |
541 | ||
542 | memrange_efi_to_native(&addr, &npages); | |
543 | ||
544 | if (executable) | |
545 | set_memory_x(addr, npages); | |
546 | else | |
547 | set_memory_nx(addr, npages); | |
548 | } | |
549 | ||
c55d016f | 550 | void __init runtime_code_page_mkexec(void) |
a2172e25 HY |
551 | { |
552 | efi_memory_desc_t *md; | |
a2172e25 HY |
553 | void *p; |
554 | ||
a2172e25 HY |
555 | /* Make EFI runtime service code area executable */ |
556 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
557 | md = p; | |
1c083eb2 HY |
558 | |
559 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
560 | continue; | |
561 | ||
9cd2b07c | 562 | efi_set_executable(md, true); |
a2172e25 | 563 | } |
a2172e25 | 564 | } |
a2172e25 | 565 | |
4e78eb05 | 566 | void __init efi_memory_uc(u64 addr, unsigned long size) |
3e8fa263 MF |
567 | { |
568 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
569 | u64 npages; | |
570 | ||
571 | npages = round_up(size, page_shift) / page_shift; | |
572 | memrange_efi_to_native(&addr, &npages); | |
573 | set_memory_uc(addr, npages); | |
574 | } | |
575 | ||
d2f7cbe7 BP |
576 | void __init old_map_region(efi_memory_desc_t *md) |
577 | { | |
578 | u64 start_pfn, end_pfn, end; | |
579 | unsigned long size; | |
580 | void *va; | |
581 | ||
582 | start_pfn = PFN_DOWN(md->phys_addr); | |
583 | size = md->num_pages << PAGE_SHIFT; | |
584 | end = md->phys_addr + size; | |
585 | end_pfn = PFN_UP(end); | |
586 | ||
587 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { | |
588 | va = __va(md->phys_addr); | |
589 | ||
590 | if (!(md->attribute & EFI_MEMORY_WB)) | |
591 | efi_memory_uc((u64)(unsigned long)va, size); | |
592 | } else | |
593 | va = efi_ioremap(md->phys_addr, size, | |
594 | md->type, md->attribute); | |
595 | ||
596 | md->virt_addr = (u64) (unsigned long) va; | |
597 | if (!va) | |
598 | pr_err("ioremap of 0x%llX failed!\n", | |
599 | (unsigned long long)md->phys_addr); | |
600 | } | |
601 | ||
481f75c0 DY |
602 | /* Merge contiguous regions of the same type and attribute */ |
603 | static void __init efi_merge_regions(void) | |
5b83683f | 604 | { |
481f75c0 | 605 | void *p; |
202f9d0a | 606 | efi_memory_desc_t *md, *prev_md = NULL; |
202f9d0a | 607 | |
202f9d0a MG |
608 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
609 | u64 prev_size; | |
610 | md = p; | |
611 | ||
612 | if (!prev_md) { | |
613 | prev_md = md; | |
614 | continue; | |
615 | } | |
616 | ||
617 | if (prev_md->type != md->type || | |
618 | prev_md->attribute != md->attribute) { | |
619 | prev_md = md; | |
620 | continue; | |
621 | } | |
622 | ||
623 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
624 | ||
625 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
626 | prev_md->num_pages += md->num_pages; | |
627 | md->type = EFI_RESERVED_TYPE; | |
628 | md->attribute = 0; | |
629 | continue; | |
630 | } | |
631 | prev_md = md; | |
481f75c0 DY |
632 | } |
633 | } | |
634 | ||
635 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) | |
636 | { | |
637 | unsigned long size; | |
638 | u64 end, systab; | |
d2f7cbe7 | 639 | |
481f75c0 DY |
640 | size = md->num_pages << EFI_PAGE_SHIFT; |
641 | end = md->phys_addr + size; | |
642 | systab = (u64)(unsigned long)efi_phys.systab; | |
643 | if (md->phys_addr <= systab && systab < end) { | |
644 | systab += md->virt_addr - md->phys_addr; | |
645 | efi.systab = (efi_system_table_t *)(unsigned long)systab; | |
202f9d0a | 646 | } |
481f75c0 DY |
647 | } |
648 | ||
fabb37c7 | 649 | static void __init save_runtime_map(void) |
926172d4 | 650 | { |
2965faa5 | 651 | #ifdef CONFIG_KEXEC_CORE |
926172d4 DY |
652 | efi_memory_desc_t *md; |
653 | void *tmp, *p, *q = NULL; | |
654 | int count = 0; | |
655 | ||
a3530e8f DY |
656 | if (efi_enabled(EFI_OLD_MEMMAP)) |
657 | return; | |
658 | ||
926172d4 DY |
659 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
660 | md = p; | |
661 | ||
662 | if (!(md->attribute & EFI_MEMORY_RUNTIME) || | |
663 | (md->type == EFI_BOOT_SERVICES_CODE) || | |
664 | (md->type == EFI_BOOT_SERVICES_DATA)) | |
665 | continue; | |
666 | tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL); | |
667 | if (!tmp) | |
668 | goto out; | |
669 | q = tmp; | |
670 | ||
671 | memcpy(q + count * memmap.desc_size, md, memmap.desc_size); | |
672 | count++; | |
673 | } | |
674 | ||
518548ab | 675 | efi_runtime_map_setup(q, count, memmap.desc_size); |
fabb37c7 | 676 | return; |
926172d4 | 677 | |
926172d4 DY |
678 | out: |
679 | kfree(q); | |
fabb37c7 BP |
680 | pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n"); |
681 | #endif | |
1fec0533 DY |
682 | } |
683 | ||
b7b898ae BP |
684 | static void *realloc_pages(void *old_memmap, int old_shift) |
685 | { | |
686 | void *ret; | |
687 | ||
688 | ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1); | |
689 | if (!ret) | |
690 | goto out; | |
691 | ||
692 | /* | |
693 | * A first-time allocation doesn't have anything to copy. | |
694 | */ | |
695 | if (!old_memmap) | |
696 | return ret; | |
697 | ||
698 | memcpy(ret, old_memmap, PAGE_SIZE << old_shift); | |
699 | ||
700 | out: | |
701 | free_pages((unsigned long)old_memmap, old_shift); | |
702 | return ret; | |
703 | } | |
704 | ||
a5caa209 MF |
705 | /* |
706 | * Iterate the EFI memory map in reverse order because the regions | |
707 | * will be mapped top-down. The end result is the same as if we had | |
708 | * mapped things forward, but doesn't require us to change the | |
709 | * existing implementation of efi_map_region(). | |
710 | */ | |
711 | static inline void *efi_map_next_entry_reverse(void *entry) | |
712 | { | |
713 | /* Initial call */ | |
714 | if (!entry) | |
715 | return memmap.map_end - memmap.desc_size; | |
716 | ||
717 | entry -= memmap.desc_size; | |
718 | if (entry < memmap.map) | |
719 | return NULL; | |
720 | ||
721 | return entry; | |
722 | } | |
723 | ||
724 | /* | |
725 | * efi_map_next_entry - Return the next EFI memory map descriptor | |
726 | * @entry: Previous EFI memory map descriptor | |
727 | * | |
728 | * This is a helper function to iterate over the EFI memory map, which | |
729 | * we do in different orders depending on the current configuration. | |
730 | * | |
731 | * To begin traversing the memory map @entry must be %NULL. | |
732 | * | |
733 | * Returns %NULL when we reach the end of the memory map. | |
734 | */ | |
735 | static void *efi_map_next_entry(void *entry) | |
736 | { | |
737 | if (!efi_enabled(EFI_OLD_MEMMAP) && efi_enabled(EFI_64BIT)) { | |
738 | /* | |
739 | * Starting in UEFI v2.5 the EFI_PROPERTIES_TABLE | |
740 | * config table feature requires us to map all entries | |
741 | * in the same order as they appear in the EFI memory | |
742 | * map. That is to say, entry N must have a lower | |
743 | * virtual address than entry N+1. This is because the | |
744 | * firmware toolchain leaves relative references in | |
745 | * the code/data sections, which are split and become | |
746 | * separate EFI memory regions. Mapping things | |
747 | * out-of-order leads to the firmware accessing | |
748 | * unmapped addresses. | |
749 | * | |
750 | * Since we need to map things this way whether or not | |
751 | * the kernel actually makes use of | |
752 | * EFI_PROPERTIES_TABLE, let's just switch to this | |
753 | * scheme by default for 64-bit. | |
754 | */ | |
755 | return efi_map_next_entry_reverse(entry); | |
756 | } | |
757 | ||
758 | /* Initial call */ | |
759 | if (!entry) | |
760 | return memmap.map; | |
761 | ||
762 | entry += memmap.desc_size; | |
763 | if (entry >= memmap.map_end) | |
764 | return NULL; | |
765 | ||
766 | return entry; | |
767 | } | |
768 | ||
481f75c0 | 769 | /* |
b7b898ae BP |
770 | * Map the efi memory ranges of the runtime services and update new_mmap with |
771 | * virtual addresses. | |
481f75c0 | 772 | */ |
b7b898ae | 773 | static void * __init efi_map_regions(int *count, int *pg_shift) |
481f75c0 | 774 | { |
b7b898ae BP |
775 | void *p, *new_memmap = NULL; |
776 | unsigned long left = 0; | |
481f75c0 | 777 | efi_memory_desc_t *md; |
202f9d0a | 778 | |
a5caa209 MF |
779 | p = NULL; |
780 | while ((p = efi_map_next_entry(p))) { | |
5b83683f | 781 | md = p; |
70087011 JB |
782 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) { |
783 | #ifdef CONFIG_X86_64 | |
784 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
785 | md->type != EFI_BOOT_SERVICES_DATA) | |
786 | #endif | |
787 | continue; | |
788 | } | |
1c083eb2 | 789 | |
d2f7cbe7 | 790 | efi_map_region(md); |
481f75c0 DY |
791 | get_systab_virt_addr(md); |
792 | ||
b7b898ae BP |
793 | if (left < memmap.desc_size) { |
794 | new_memmap = realloc_pages(new_memmap, *pg_shift); | |
795 | if (!new_memmap) | |
796 | return NULL; | |
797 | ||
798 | left += PAGE_SIZE << *pg_shift; | |
799 | (*pg_shift)++; | |
800 | } | |
801 | ||
481f75c0 DY |
802 | memcpy(new_memmap + (*count * memmap.desc_size), md, |
803 | memmap.desc_size); | |
b7b898ae BP |
804 | |
805 | left -= memmap.desc_size; | |
481f75c0 DY |
806 | (*count)++; |
807 | } | |
d2f7cbe7 | 808 | |
481f75c0 | 809 | return new_memmap; |
481f75c0 DY |
810 | } |
811 | ||
fabb37c7 BP |
812 | static void __init kexec_enter_virtual_mode(void) |
813 | { | |
2965faa5 | 814 | #ifdef CONFIG_KEXEC_CORE |
fabb37c7 | 815 | efi_memory_desc_t *md; |
753b11ef | 816 | unsigned int num_pages; |
fabb37c7 BP |
817 | void *p; |
818 | ||
819 | efi.systab = NULL; | |
820 | ||
821 | /* | |
822 | * We don't do virtual mode, since we don't do runtime services, on | |
823 | * non-native EFI | |
824 | */ | |
825 | if (!efi_is_native()) { | |
826 | efi_unmap_memmap(); | |
a5a750a9 | 827 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 BP |
828 | return; |
829 | } | |
830 | ||
753b11ef MF |
831 | if (efi_alloc_page_tables()) { |
832 | pr_err("Failed to allocate EFI page tables\n"); | |
833 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
834 | return; | |
835 | } | |
836 | ||
fabb37c7 BP |
837 | /* |
838 | * Map efi regions which were passed via setup_data. The virt_addr is a | |
839 | * fixed addr which was used in first kernel of a kexec boot. | |
840 | */ | |
841 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
842 | md = p; | |
843 | efi_map_region_fixed(md); /* FIXME: add error handling */ | |
844 | get_systab_virt_addr(md); | |
845 | } | |
846 | ||
847 | save_runtime_map(); | |
848 | ||
849 | BUG_ON(!efi.systab); | |
850 | ||
753b11ef MF |
851 | num_pages = ALIGN(memmap.nr_map * memmap.desc_size, PAGE_SIZE); |
852 | num_pages >>= PAGE_SHIFT; | |
853 | ||
854 | if (efi_setup_page_tables(memmap.phys_map, num_pages)) { | |
855 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
856 | return; | |
857 | } | |
858 | ||
fabb37c7 BP |
859 | efi_sync_low_kernel_mappings(); |
860 | ||
861 | /* | |
862 | * Now that EFI is in virtual mode, update the function | |
863 | * pointers in the runtime service table to the new virtual addresses. | |
864 | * | |
865 | * Call EFI services through wrapper functions. | |
866 | */ | |
867 | efi.runtime_version = efi_systab.hdr.revision; | |
994448f1 | 868 | |
022ee6c5 | 869 | efi_native_runtime_setup(); |
994448f1 | 870 | |
fabb37c7 | 871 | efi.set_virtual_address_map = NULL; |
fabb37c7 BP |
872 | |
873 | if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX)) | |
874 | runtime_code_page_mkexec(); | |
875 | ||
876 | /* clean DUMMY object */ | |
eeb9db09 | 877 | efi_delete_dummy_variable(); |
fabb37c7 BP |
878 | #endif |
879 | } | |
880 | ||
481f75c0 DY |
881 | /* |
882 | * This function will switch the EFI runtime services to virtual mode. | |
883 | * Essentially, we look through the EFI memmap and map every region that | |
884 | * has the runtime attribute bit set in its memory descriptor into the | |
67a9108e | 885 | * efi_pgd page table. |
481f75c0 DY |
886 | * |
887 | * The old method which used to update that memory descriptor with the | |
888 | * virtual address obtained from ioremap() is still supported when the | |
889 | * kernel is booted with efi=old_map on its command line. Same old | |
890 | * method enabled the runtime services to be called without having to | |
891 | * thunk back into physical mode for every invocation. | |
892 | * | |
893 | * The new method does a pagetable switch in a preemption-safe manner | |
894 | * so that we're in a different address space when calling a runtime | |
67a9108e MF |
895 | * function. For function arguments passing we do copy the PUDs of the |
896 | * kernel page table into efi_pgd prior to each call. | |
1fec0533 DY |
897 | * |
898 | * Specially for kexec boot, efi runtime maps in previous kernel should | |
899 | * be passed in via setup_data. In that case runtime ranges will be mapped | |
fabb37c7 BP |
900 | * to the same virtual addresses as the first kernel, see |
901 | * kexec_enter_virtual_mode(). | |
481f75c0 | 902 | */ |
fabb37c7 | 903 | static void __init __efi_enter_virtual_mode(void) |
481f75c0 | 904 | { |
fabb37c7 | 905 | int count = 0, pg_shift = 0; |
481f75c0 | 906 | void *new_memmap = NULL; |
b7b898ae | 907 | efi_status_t status; |
1c083eb2 | 908 | |
481f75c0 | 909 | efi.systab = NULL; |
d2f7cbe7 | 910 | |
67a9108e MF |
911 | if (efi_alloc_page_tables()) { |
912 | pr_err("Failed to allocate EFI page tables\n"); | |
913 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
914 | return; | |
915 | } | |
916 | ||
fabb37c7 BP |
917 | efi_merge_regions(); |
918 | new_memmap = efi_map_regions(&count, &pg_shift); | |
919 | if (!new_memmap) { | |
920 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); | |
a5a750a9 | 921 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 | 922 | return; |
b7b898ae | 923 | } |
926172d4 | 924 | |
fabb37c7 BP |
925 | save_runtime_map(); |
926 | ||
5b83683f HY |
927 | BUG_ON(!efi.systab); |
928 | ||
a5a750a9 DY |
929 | if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) { |
930 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
fabb37c7 | 931 | return; |
a5a750a9 | 932 | } |
b7b898ae | 933 | |
d2f7cbe7 BP |
934 | efi_sync_low_kernel_mappings(); |
935 | ||
994448f1 MF |
936 | if (efi_is_native()) { |
937 | status = phys_efi_set_virtual_address_map( | |
938 | memmap.desc_size * count, | |
939 | memmap.desc_size, | |
940 | memmap.desc_version, | |
941 | (efi_memory_desc_t *)__pa(new_memmap)); | |
942 | } else { | |
943 | status = efi_thunk_set_virtual_address_map( | |
944 | efi_phys.set_virtual_address_map, | |
945 | memmap.desc_size * count, | |
946 | memmap.desc_size, | |
947 | memmap.desc_version, | |
948 | (efi_memory_desc_t *)__pa(new_memmap)); | |
949 | } | |
1fec0533 | 950 | |
fabb37c7 BP |
951 | if (status != EFI_SUCCESS) { |
952 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", | |
953 | status); | |
954 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
5b83683f HY |
955 | } |
956 | ||
957 | /* | |
958 | * Now that EFI is in virtual mode, update the function | |
959 | * pointers in the runtime service table to the new virtual addresses. | |
960 | * | |
961 | * Call EFI services through wrapper functions. | |
962 | */ | |
712ba9e9 | 963 | efi.runtime_version = efi_systab.hdr.revision; |
4f9dbcfc MF |
964 | |
965 | if (efi_is_native()) | |
022ee6c5 | 966 | efi_native_runtime_setup(); |
4f9dbcfc MF |
967 | else |
968 | efi_thunk_runtime_setup(); | |
969 | ||
2b5e8ef3 | 970 | efi.set_virtual_address_map = NULL; |
d2f7cbe7 | 971 | |
6d0cc887 SP |
972 | /* |
973 | * Apply more restrictive page table mapping attributes now that | |
974 | * SVAM() has been called and the firmware has performed all | |
975 | * necessary relocation fixups for the new virtual addresses. | |
976 | */ | |
977 | efi_runtime_update_mappings(); | |
978 | efi_dump_pagetable(); | |
1adbfa35 | 979 | |
b7b898ae | 980 | /* |
67a9108e MF |
981 | * We mapped the descriptor array into the EFI pagetable above |
982 | * but we're not unmapping it here because if we're running in | |
983 | * EFI mixed mode we need all of memory to be accessible when | |
984 | * we pass parameters to the EFI runtime services in the | |
985 | * thunking code. | |
b7b898ae BP |
986 | * |
987 | * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift); | |
988 | */ | |
fabb37c7 | 989 | free_pages((unsigned long)new_memmap, pg_shift); |
f8b84043 MG |
990 | |
991 | /* clean DUMMY object */ | |
eeb9db09 | 992 | efi_delete_dummy_variable(); |
5b83683f HY |
993 | } |
994 | ||
fabb37c7 BP |
995 | void __init efi_enter_virtual_mode(void) |
996 | { | |
9f27bc54 DK |
997 | if (efi_enabled(EFI_PARAVIRT)) |
998 | return; | |
999 | ||
fabb37c7 BP |
1000 | if (efi_setup) |
1001 | kexec_enter_virtual_mode(); | |
1002 | else | |
1003 | __efi_enter_virtual_mode(); | |
1004 | } | |
1005 | ||
5b83683f HY |
1006 | /* |
1007 | * Convenience functions to obtain memory types and attributes | |
1008 | */ | |
1009 | u32 efi_mem_type(unsigned long phys_addr) | |
1010 | { | |
1011 | efi_memory_desc_t *md; | |
1012 | void *p; | |
1013 | ||
83e68189 MF |
1014 | if (!efi_enabled(EFI_MEMMAP)) |
1015 | return 0; | |
1016 | ||
5b83683f HY |
1017 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
1018 | md = p; | |
1019 | if ((md->phys_addr <= phys_addr) && | |
1020 | (phys_addr < (md->phys_addr + | |
1021 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
1022 | return md->type; | |
1023 | } | |
1024 | return 0; | |
1025 | } | |
1026 | ||
5ae3683c | 1027 | static int __init arch_parse_efi_cmdline(char *str) |
d2f7cbe7 | 1028 | { |
9115c758 RN |
1029 | if (!str) { |
1030 | pr_warn("need at least one option\n"); | |
1031 | return -EINVAL; | |
1032 | } | |
1033 | ||
6ccc72b8 DY |
1034 | if (parse_option_str(str, "old_map")) |
1035 | set_bit(EFI_OLD_MEMMAP, &efi.flags); | |
d2f7cbe7 BP |
1036 | |
1037 | return 0; | |
1038 | } | |
5ae3683c | 1039 | early_param("efi", arch_parse_efi_cmdline); |