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 | ||
3565184e | 101 | void efi_get_time(struct timespec *now) |
5b83683f HY |
102 | { |
103 | efi_status_t status; | |
104 | efi_time_t eft; | |
105 | efi_time_cap_t cap; | |
106 | ||
107 | status = efi.get_time(&eft, &cap); | |
108 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 109 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f | 110 | |
3565184e DV |
111 | now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour, |
112 | eft.minute, eft.second); | |
113 | now->tv_nsec = 0; | |
5b83683f HY |
114 | } |
115 | ||
b05b9f5f TL |
116 | void __init efi_find_mirror(void) |
117 | { | |
78ce248f | 118 | efi_memory_desc_t *md; |
b05b9f5f TL |
119 | u64 mirror_size = 0, total_size = 0; |
120 | ||
78ce248f | 121 | for_each_efi_memory_desc(md) { |
b05b9f5f TL |
122 | unsigned long long start = md->phys_addr; |
123 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
124 | ||
125 | total_size += size; | |
126 | if (md->attribute & EFI_MEMORY_MORE_RELIABLE) { | |
127 | memblock_mark_mirror(start, size); | |
128 | mirror_size += size; | |
129 | } | |
130 | } | |
131 | if (mirror_size) | |
132 | pr_info("Memory: %lldM/%lldM mirrored memory\n", | |
133 | mirror_size>>20, total_size>>20); | |
134 | } | |
135 | ||
69c91893 PJ |
136 | /* |
137 | * Tell the kernel about the EFI memory map. This might include | |
138 | * more than the max 128 entries that can fit in the e820 legacy | |
139 | * (zeropage) memory map. | |
140 | */ | |
141 | ||
200001eb | 142 | static void __init do_add_efi_memmap(void) |
69c91893 | 143 | { |
78ce248f | 144 | efi_memory_desc_t *md; |
69c91893 | 145 | |
78ce248f | 146 | for_each_efi_memory_desc(md) { |
69c91893 PJ |
147 | unsigned long long start = md->phys_addr; |
148 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
149 | int e820_type; | |
150 | ||
e2a71476 CW |
151 | switch (md->type) { |
152 | case EFI_LOADER_CODE: | |
153 | case EFI_LOADER_DATA: | |
154 | case EFI_BOOT_SERVICES_CODE: | |
155 | case EFI_BOOT_SERVICES_DATA: | |
156 | case EFI_CONVENTIONAL_MEMORY: | |
157 | if (md->attribute & EFI_MEMORY_WB) | |
158 | e820_type = E820_RAM; | |
159 | else | |
160 | e820_type = E820_RESERVED; | |
161 | break; | |
162 | case EFI_ACPI_RECLAIM_MEMORY: | |
163 | e820_type = E820_ACPI; | |
164 | break; | |
165 | case EFI_ACPI_MEMORY_NVS: | |
166 | e820_type = E820_NVS; | |
167 | break; | |
168 | case EFI_UNUSABLE_MEMORY: | |
169 | e820_type = E820_UNUSABLE; | |
170 | break; | |
ad5fb870 DW |
171 | case EFI_PERSISTENT_MEMORY: |
172 | e820_type = E820_PMEM; | |
173 | break; | |
e2a71476 CW |
174 | default: |
175 | /* | |
176 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
177 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
178 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
179 | */ | |
69c91893 | 180 | e820_type = E820_RESERVED; |
e2a71476 CW |
181 | break; |
182 | } | |
d0be6bde | 183 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
184 | } |
185 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
186 | } | |
187 | ||
1adbfa35 | 188 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 189 | { |
15b9c359 | 190 | struct efi_info *e = &boot_params.efi_info; |
44511fb9 | 191 | phys_addr_t pmap; |
ecacf09f | 192 | |
9f27bc54 DK |
193 | if (efi_enabled(EFI_PARAVIRT)) |
194 | return 0; | |
195 | ||
05486fa7 | 196 | #ifdef CONFIG_X86_32 |
1adbfa35 | 197 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 198 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
199 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
200 | return -EINVAL; | |
201 | } | |
15b9c359 | 202 | pmap = e->efi_memmap; |
05486fa7 | 203 | #else |
15b9c359 | 204 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 205 | #endif |
884f4f66 MF |
206 | efi.memmap.phys_map = pmap; |
207 | efi.memmap.nr_map = e->efi_memmap_size / | |
15b9c359 | 208 | e->efi_memdesc_size; |
884f4f66 MF |
209 | efi.memmap.desc_size = e->efi_memdesc_size; |
210 | efi.memmap.desc_version = e->efi_memdesc_version; | |
1adbfa35 | 211 | |
0d054ad9 AB |
212 | WARN(efi.memmap.desc_version != 1, |
213 | "Unexpected EFI_MEMORY_DESCRIPTOR version %ld", | |
214 | efi.memmap.desc_version); | |
215 | ||
884f4f66 | 216 | memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size); |
258f6fd7 | 217 | |
1adbfa35 | 218 | return 0; |
ecacf09f HY |
219 | } |
220 | ||
0bbea1ce | 221 | void __init efi_print_memmap(void) |
5b83683f HY |
222 | { |
223 | efi_memory_desc_t *md; | |
78ce248f | 224 | int i = 0; |
5b83683f | 225 | |
78ce248f | 226 | for_each_efi_memory_desc(md) { |
ace1d121 LE |
227 | char buf[64]; |
228 | ||
1e82b947 | 229 | pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n", |
78ce248f | 230 | i++, efi_md_typeattr_format(buf, sizeof(buf), md), |
ace1d121 | 231 | md->phys_addr, |
1e82b947 | 232 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1, |
5b83683f HY |
233 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); |
234 | } | |
f4fccac0 | 235 | } |
5b83683f | 236 | |
5189c2a7 | 237 | void __init efi_unmap_memmap(void) |
78510792 | 238 | { |
884f4f66 MF |
239 | unsigned long size; |
240 | ||
3e909599 | 241 | clear_bit(EFI_MEMMAP, &efi.flags); |
884f4f66 MF |
242 | |
243 | size = efi.memmap.nr_map * efi.memmap.desc_size; | |
244 | if (efi.memmap.map) { | |
245 | early_memunmap(efi.memmap.map, size); | |
246 | efi.memmap.map = NULL; | |
78510792 JT |
247 | } |
248 | } | |
249 | ||
140bf275 | 250 | static int __init efi_systab_init(void *phys) |
5b83683f | 251 | { |
83e68189 | 252 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 | 253 | efi_system_table_64_t *systab64; |
1fec0533 | 254 | struct efi_setup_data *data = NULL; |
1adbfa35 OJ |
255 | u64 tmp = 0; |
256 | ||
1fec0533 DY |
257 | if (efi_setup) { |
258 | data = early_memremap(efi_setup, sizeof(*data)); | |
259 | if (!data) | |
260 | return -ENOMEM; | |
261 | } | |
abc93f8e | 262 | systab64 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
263 | sizeof(*systab64)); |
264 | if (systab64 == NULL) { | |
265 | pr_err("Couldn't map the system table!\n"); | |
1fec0533 | 266 | if (data) |
abc93f8e | 267 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
268 | return -ENOMEM; |
269 | } | |
270 | ||
271 | efi_systab.hdr = systab64->hdr; | |
1fec0533 DY |
272 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
273 | systab64->fw_vendor; | |
274 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; | |
1adbfa35 OJ |
275 | efi_systab.fw_revision = systab64->fw_revision; |
276 | efi_systab.con_in_handle = systab64->con_in_handle; | |
277 | tmp |= systab64->con_in_handle; | |
278 | efi_systab.con_in = systab64->con_in; | |
279 | tmp |= systab64->con_in; | |
280 | efi_systab.con_out_handle = systab64->con_out_handle; | |
281 | tmp |= systab64->con_out_handle; | |
282 | efi_systab.con_out = systab64->con_out; | |
283 | tmp |= systab64->con_out; | |
284 | efi_systab.stderr_handle = systab64->stderr_handle; | |
285 | tmp |= systab64->stderr_handle; | |
286 | efi_systab.stderr = systab64->stderr; | |
287 | tmp |= systab64->stderr; | |
1fec0533 DY |
288 | efi_systab.runtime = data ? |
289 | (void *)(unsigned long)data->runtime : | |
290 | (void *)(unsigned long)systab64->runtime; | |
291 | tmp |= data ? data->runtime : systab64->runtime; | |
1adbfa35 OJ |
292 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
293 | tmp |= systab64->boottime; | |
294 | efi_systab.nr_tables = systab64->nr_tables; | |
1fec0533 DY |
295 | efi_systab.tables = data ? (unsigned long)data->tables : |
296 | systab64->tables; | |
297 | tmp |= data ? data->tables : systab64->tables; | |
1adbfa35 | 298 | |
abc93f8e | 299 | early_memunmap(systab64, sizeof(*systab64)); |
1fec0533 | 300 | if (data) |
abc93f8e | 301 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
302 | #ifdef CONFIG_X86_32 |
303 | if (tmp >> 32) { | |
304 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
305 | return -EINVAL; | |
306 | } | |
307 | #endif | |
308 | } else { | |
309 | efi_system_table_32_t *systab32; | |
310 | ||
abc93f8e | 311 | systab32 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
312 | sizeof(*systab32)); |
313 | if (systab32 == NULL) { | |
314 | pr_err("Couldn't map the system table!\n"); | |
315 | return -ENOMEM; | |
316 | } | |
317 | ||
318 | efi_systab.hdr = systab32->hdr; | |
319 | efi_systab.fw_vendor = systab32->fw_vendor; | |
320 | efi_systab.fw_revision = systab32->fw_revision; | |
321 | efi_systab.con_in_handle = systab32->con_in_handle; | |
322 | efi_systab.con_in = systab32->con_in; | |
323 | efi_systab.con_out_handle = systab32->con_out_handle; | |
324 | efi_systab.con_out = systab32->con_out; | |
325 | efi_systab.stderr_handle = systab32->stderr_handle; | |
326 | efi_systab.stderr = systab32->stderr; | |
327 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
328 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
329 | efi_systab.nr_tables = systab32->nr_tables; | |
330 | efi_systab.tables = systab32->tables; | |
331 | ||
abc93f8e | 332 | early_memunmap(systab32, sizeof(*systab32)); |
140bf275 | 333 | } |
1adbfa35 | 334 | |
5b83683f HY |
335 | efi.systab = &efi_systab; |
336 | ||
337 | /* | |
338 | * Verify the EFI Table | |
339 | */ | |
140bf275 | 340 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 341 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
342 | return -EINVAL; |
343 | } | |
5b83683f | 344 | if ((efi.systab->hdr.revision >> 16) == 0) |
9b7d2049 | 345 | pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n", |
5b83683f HY |
346 | efi.systab->hdr.revision >> 16, |
347 | efi.systab->hdr.revision & 0xffff); | |
140bf275 OJ |
348 | |
349 | return 0; | |
83e7ee66 | 350 | } |
5b83683f | 351 | |
4f9dbcfc | 352 | static int __init efi_runtime_init32(void) |
83e7ee66 | 353 | { |
4f9dbcfc MF |
354 | efi_runtime_services_32_t *runtime; |
355 | ||
abc93f8e | 356 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc MF |
357 | sizeof(efi_runtime_services_32_t)); |
358 | if (!runtime) { | |
359 | pr_err("Could not map the runtime service table!\n"); | |
360 | return -ENOMEM; | |
361 | } | |
5b83683f HY |
362 | |
363 | /* | |
0ce4605c MK |
364 | * We will only need *early* access to the SetVirtualAddressMap |
365 | * EFI runtime service. All other runtime services will be called | |
366 | * via the virtual mapping. | |
5b83683f | 367 | */ |
4f9dbcfc MF |
368 | efi_phys.set_virtual_address_map = |
369 | (efi_set_virtual_address_map_t *) | |
370 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 371 | early_memunmap(runtime, sizeof(efi_runtime_services_32_t)); |
4f9dbcfc MF |
372 | |
373 | return 0; | |
374 | } | |
375 | ||
376 | static int __init efi_runtime_init64(void) | |
377 | { | |
378 | efi_runtime_services_64_t *runtime; | |
379 | ||
abc93f8e | 380 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc | 381 | sizeof(efi_runtime_services_64_t)); |
140bf275 | 382 | if (!runtime) { |
e3cb3f5a | 383 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
384 | return -ENOMEM; |
385 | } | |
4f9dbcfc | 386 | |
140bf275 | 387 | /* |
0ce4605c MK |
388 | * We will only need *early* access to the SetVirtualAddressMap |
389 | * EFI runtime service. All other runtime services will be called | |
390 | * via the virtual mapping. | |
140bf275 | 391 | */ |
140bf275 | 392 | efi_phys.set_virtual_address_map = |
4f9dbcfc MF |
393 | (efi_set_virtual_address_map_t *) |
394 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 395 | early_memunmap(runtime, sizeof(efi_runtime_services_64_t)); |
4f9dbcfc MF |
396 | |
397 | return 0; | |
398 | } | |
399 | ||
400 | static int __init efi_runtime_init(void) | |
401 | { | |
402 | int rv; | |
403 | ||
404 | /* | |
405 | * Check out the runtime services table. We need to map | |
406 | * the runtime services table so that we can grab the physical | |
407 | * address of several of the EFI runtime functions, needed to | |
408 | * set the firmware into virtual mode. | |
9f27bc54 DK |
409 | * |
410 | * When EFI_PARAVIRT is in force then we could not map runtime | |
411 | * service memory region because we do not have direct access to it. | |
412 | * However, runtime services are available through proxy functions | |
413 | * (e.g. in case of Xen dom0 EFI implementation they call special | |
414 | * hypercall which executes relevant EFI functions) and that is why | |
415 | * they are always enabled. | |
4f9dbcfc | 416 | */ |
4f9dbcfc | 417 | |
9f27bc54 DK |
418 | if (!efi_enabled(EFI_PARAVIRT)) { |
419 | if (efi_enabled(EFI_64BIT)) | |
420 | rv = efi_runtime_init64(); | |
421 | else | |
422 | rv = efi_runtime_init32(); | |
423 | ||
424 | if (rv) | |
425 | return rv; | |
426 | } | |
140bf275 | 427 | |
0f8093a9 MF |
428 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
429 | ||
140bf275 | 430 | return 0; |
83e7ee66 | 431 | } |
5b83683f | 432 | |
140bf275 | 433 | static int __init efi_memmap_init(void) |
83e7ee66 | 434 | { |
884f4f66 MF |
435 | unsigned long addr, size; |
436 | ||
9f27bc54 DK |
437 | if (efi_enabled(EFI_PARAVIRT)) |
438 | return 0; | |
439 | ||
5b83683f | 440 | /* Map the EFI memory map */ |
884f4f66 MF |
441 | size = efi.memmap.nr_map * efi.memmap.desc_size; |
442 | addr = (unsigned long)efi.memmap.phys_map; | |
443 | ||
444 | efi.memmap.map = early_memremap(addr, size); | |
445 | if (efi.memmap.map == NULL) { | |
e3cb3f5a | 446 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
447 | return -ENOMEM; |
448 | } | |
884f4f66 MF |
449 | |
450 | efi.memmap.map_end = efi.memmap.map + size; | |
175e438f | 451 | |
200001eb PJ |
452 | if (add_efi_memmap) |
453 | do_add_efi_memmap(); | |
140bf275 | 454 | |
0f8093a9 MF |
455 | set_bit(EFI_MEMMAP, &efi.flags); |
456 | ||
140bf275 | 457 | return 0; |
83e7ee66 OJ |
458 | } |
459 | ||
460 | void __init efi_init(void) | |
461 | { | |
462 | efi_char16_t *c16; | |
463 | char vendor[100] = "unknown"; | |
464 | int i = 0; | |
465 | void *tmp; | |
466 | ||
467 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
468 | if (boot_params.efi_info.efi_systab_hi || |
469 | boot_params.efi_info.efi_memmap_hi) { | |
470 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
471 | return; |
472 | } | |
83e7ee66 OJ |
473 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
474 | #else | |
475 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
476 | (boot_params.efi_info.efi_systab | |
477 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
478 | #endif |
479 | ||
83e68189 | 480 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 481 | return; |
83e68189 | 482 | |
a0998eb1 DY |
483 | efi.config_table = (unsigned long)efi.systab->tables; |
484 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; | |
485 | efi.runtime = (unsigned long)efi.systab->runtime; | |
486 | ||
83e7ee66 OJ |
487 | /* |
488 | * Show what we know for posterity | |
489 | */ | |
abc93f8e | 490 | c16 = tmp = early_memremap(efi.systab->fw_vendor, 2); |
83e7ee66 OJ |
491 | if (c16) { |
492 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
493 | vendor[i] = *c16++; | |
494 | vendor[i] = '\0'; | |
495 | } else | |
e3cb3f5a | 496 | pr_err("Could not map the firmware vendor!\n"); |
abc93f8e | 497 | early_memunmap(tmp, 2); |
83e7ee66 | 498 | |
e3cb3f5a OJ |
499 | pr_info("EFI v%u.%.02u by %s\n", |
500 | efi.systab->hdr.revision >> 16, | |
501 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 502 | |
1fec0533 DY |
503 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
504 | return; | |
505 | ||
272686bf | 506 | if (efi_config_init(arch_tables)) |
140bf275 | 507 | return; |
83e68189 | 508 | |
1adbfa35 OJ |
509 | /* |
510 | * Note: We currently don't support runtime services on an EFI | |
511 | * that doesn't match the kernel 32/64-bit mode. | |
512 | */ | |
513 | ||
7d453eee | 514 | if (!efi_runtime_supported()) |
1adbfa35 | 515 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 516 | else { |
b2e0a54a | 517 | if (efi_runtime_disabled() || efi_runtime_init()) |
83e68189 | 518 | return; |
140bf275 | 519 | } |
83e68189 | 520 | if (efi_memmap_init()) |
140bf275 | 521 | return; |
83e68189 | 522 | |
fed6cefe | 523 | if (efi_enabled(EFI_DBG)) |
0bbea1ce | 524 | efi_print_memmap(); |
0bb54905 PJ |
525 | |
526 | efi_esrt_init(); | |
5b83683f HY |
527 | } |
528 | ||
2223af38 JT |
529 | void __init efi_late_init(void) |
530 | { | |
531 | efi_bgrt_init(); | |
532 | } | |
533 | ||
9cd2b07c MG |
534 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
535 | { | |
536 | u64 addr, npages; | |
537 | ||
538 | addr = md->virt_addr; | |
539 | npages = md->num_pages; | |
540 | ||
541 | memrange_efi_to_native(&addr, &npages); | |
542 | ||
543 | if (executable) | |
544 | set_memory_x(addr, npages); | |
545 | else | |
546 | set_memory_nx(addr, npages); | |
547 | } | |
548 | ||
c55d016f | 549 | void __init runtime_code_page_mkexec(void) |
a2172e25 HY |
550 | { |
551 | efi_memory_desc_t *md; | |
a2172e25 | 552 | |
a2172e25 | 553 | /* Make EFI runtime service code area executable */ |
78ce248f | 554 | for_each_efi_memory_desc(md) { |
1c083eb2 HY |
555 | if (md->type != EFI_RUNTIME_SERVICES_CODE) |
556 | continue; | |
557 | ||
9cd2b07c | 558 | efi_set_executable(md, true); |
a2172e25 | 559 | } |
a2172e25 | 560 | } |
a2172e25 | 561 | |
4e78eb05 | 562 | void __init efi_memory_uc(u64 addr, unsigned long size) |
3e8fa263 MF |
563 | { |
564 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
565 | u64 npages; | |
566 | ||
567 | npages = round_up(size, page_shift) / page_shift; | |
568 | memrange_efi_to_native(&addr, &npages); | |
569 | set_memory_uc(addr, npages); | |
570 | } | |
571 | ||
d2f7cbe7 BP |
572 | void __init old_map_region(efi_memory_desc_t *md) |
573 | { | |
574 | u64 start_pfn, end_pfn, end; | |
575 | unsigned long size; | |
576 | void *va; | |
577 | ||
578 | start_pfn = PFN_DOWN(md->phys_addr); | |
579 | size = md->num_pages << PAGE_SHIFT; | |
580 | end = md->phys_addr + size; | |
581 | end_pfn = PFN_UP(end); | |
582 | ||
583 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { | |
584 | va = __va(md->phys_addr); | |
585 | ||
586 | if (!(md->attribute & EFI_MEMORY_WB)) | |
587 | efi_memory_uc((u64)(unsigned long)va, size); | |
588 | } else | |
589 | va = efi_ioremap(md->phys_addr, size, | |
590 | md->type, md->attribute); | |
591 | ||
592 | md->virt_addr = (u64) (unsigned long) va; | |
593 | if (!va) | |
594 | pr_err("ioremap of 0x%llX failed!\n", | |
595 | (unsigned long long)md->phys_addr); | |
596 | } | |
597 | ||
481f75c0 DY |
598 | /* Merge contiguous regions of the same type and attribute */ |
599 | static void __init efi_merge_regions(void) | |
5b83683f | 600 | { |
202f9d0a | 601 | efi_memory_desc_t *md, *prev_md = NULL; |
202f9d0a | 602 | |
78ce248f | 603 | for_each_efi_memory_desc(md) { |
202f9d0a | 604 | u64 prev_size; |
202f9d0a MG |
605 | |
606 | if (!prev_md) { | |
607 | prev_md = md; | |
608 | continue; | |
609 | } | |
610 | ||
611 | if (prev_md->type != md->type || | |
612 | prev_md->attribute != md->attribute) { | |
613 | prev_md = md; | |
614 | continue; | |
615 | } | |
616 | ||
617 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
618 | ||
619 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
620 | prev_md->num_pages += md->num_pages; | |
621 | md->type = EFI_RESERVED_TYPE; | |
622 | md->attribute = 0; | |
623 | continue; | |
624 | } | |
625 | prev_md = md; | |
481f75c0 DY |
626 | } |
627 | } | |
628 | ||
629 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) | |
630 | { | |
631 | unsigned long size; | |
632 | u64 end, systab; | |
d2f7cbe7 | 633 | |
481f75c0 DY |
634 | size = md->num_pages << EFI_PAGE_SHIFT; |
635 | end = md->phys_addr + size; | |
636 | systab = (u64)(unsigned long)efi_phys.systab; | |
637 | if (md->phys_addr <= systab && systab < end) { | |
638 | systab += md->virt_addr - md->phys_addr; | |
639 | efi.systab = (efi_system_table_t *)(unsigned long)systab; | |
202f9d0a | 640 | } |
481f75c0 DY |
641 | } |
642 | ||
fabb37c7 | 643 | static void __init save_runtime_map(void) |
926172d4 | 644 | { |
2965faa5 | 645 | #ifdef CONFIG_KEXEC_CORE |
884f4f66 | 646 | unsigned long desc_size; |
926172d4 | 647 | efi_memory_desc_t *md; |
78ce248f | 648 | void *tmp, *q = NULL; |
926172d4 DY |
649 | int count = 0; |
650 | ||
a3530e8f DY |
651 | if (efi_enabled(EFI_OLD_MEMMAP)) |
652 | return; | |
653 | ||
884f4f66 MF |
654 | desc_size = efi.memmap.desc_size; |
655 | ||
78ce248f | 656 | for_each_efi_memory_desc(md) { |
926172d4 DY |
657 | if (!(md->attribute & EFI_MEMORY_RUNTIME) || |
658 | (md->type == EFI_BOOT_SERVICES_CODE) || | |
659 | (md->type == EFI_BOOT_SERVICES_DATA)) | |
660 | continue; | |
884f4f66 | 661 | tmp = krealloc(q, (count + 1) * desc_size, GFP_KERNEL); |
926172d4 DY |
662 | if (!tmp) |
663 | goto out; | |
664 | q = tmp; | |
665 | ||
884f4f66 | 666 | memcpy(q + count * desc_size, md, desc_size); |
926172d4 DY |
667 | count++; |
668 | } | |
669 | ||
884f4f66 | 670 | efi_runtime_map_setup(q, count, desc_size); |
fabb37c7 | 671 | return; |
926172d4 | 672 | |
926172d4 DY |
673 | out: |
674 | kfree(q); | |
fabb37c7 BP |
675 | pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n"); |
676 | #endif | |
1fec0533 DY |
677 | } |
678 | ||
b7b898ae BP |
679 | static void *realloc_pages(void *old_memmap, int old_shift) |
680 | { | |
681 | void *ret; | |
682 | ||
683 | ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1); | |
684 | if (!ret) | |
685 | goto out; | |
686 | ||
687 | /* | |
688 | * A first-time allocation doesn't have anything to copy. | |
689 | */ | |
690 | if (!old_memmap) | |
691 | return ret; | |
692 | ||
693 | memcpy(ret, old_memmap, PAGE_SIZE << old_shift); | |
694 | ||
695 | out: | |
696 | free_pages((unsigned long)old_memmap, old_shift); | |
697 | return ret; | |
698 | } | |
699 | ||
a5caa209 MF |
700 | /* |
701 | * Iterate the EFI memory map in reverse order because the regions | |
702 | * will be mapped top-down. The end result is the same as if we had | |
703 | * mapped things forward, but doesn't require us to change the | |
704 | * existing implementation of efi_map_region(). | |
705 | */ | |
706 | static inline void *efi_map_next_entry_reverse(void *entry) | |
707 | { | |
708 | /* Initial call */ | |
709 | if (!entry) | |
884f4f66 | 710 | return efi.memmap.map_end - efi.memmap.desc_size; |
a5caa209 | 711 | |
884f4f66 MF |
712 | entry -= efi.memmap.desc_size; |
713 | if (entry < efi.memmap.map) | |
a5caa209 MF |
714 | return NULL; |
715 | ||
716 | return entry; | |
717 | } | |
718 | ||
719 | /* | |
720 | * efi_map_next_entry - Return the next EFI memory map descriptor | |
721 | * @entry: Previous EFI memory map descriptor | |
722 | * | |
723 | * This is a helper function to iterate over the EFI memory map, which | |
724 | * we do in different orders depending on the current configuration. | |
725 | * | |
726 | * To begin traversing the memory map @entry must be %NULL. | |
727 | * | |
728 | * Returns %NULL when we reach the end of the memory map. | |
729 | */ | |
730 | static void *efi_map_next_entry(void *entry) | |
731 | { | |
732 | if (!efi_enabled(EFI_OLD_MEMMAP) && efi_enabled(EFI_64BIT)) { | |
733 | /* | |
734 | * Starting in UEFI v2.5 the EFI_PROPERTIES_TABLE | |
735 | * config table feature requires us to map all entries | |
736 | * in the same order as they appear in the EFI memory | |
737 | * map. That is to say, entry N must have a lower | |
738 | * virtual address than entry N+1. This is because the | |
739 | * firmware toolchain leaves relative references in | |
740 | * the code/data sections, which are split and become | |
741 | * separate EFI memory regions. Mapping things | |
742 | * out-of-order leads to the firmware accessing | |
743 | * unmapped addresses. | |
744 | * | |
745 | * Since we need to map things this way whether or not | |
746 | * the kernel actually makes use of | |
747 | * EFI_PROPERTIES_TABLE, let's just switch to this | |
748 | * scheme by default for 64-bit. | |
749 | */ | |
750 | return efi_map_next_entry_reverse(entry); | |
751 | } | |
752 | ||
753 | /* Initial call */ | |
754 | if (!entry) | |
884f4f66 | 755 | return efi.memmap.map; |
a5caa209 | 756 | |
884f4f66 MF |
757 | entry += efi.memmap.desc_size; |
758 | if (entry >= efi.memmap.map_end) | |
a5caa209 MF |
759 | return NULL; |
760 | ||
761 | return entry; | |
762 | } | |
763 | ||
481f75c0 | 764 | /* |
b7b898ae BP |
765 | * Map the efi memory ranges of the runtime services and update new_mmap with |
766 | * virtual addresses. | |
481f75c0 | 767 | */ |
b7b898ae | 768 | static void * __init efi_map_regions(int *count, int *pg_shift) |
481f75c0 | 769 | { |
b7b898ae BP |
770 | void *p, *new_memmap = NULL; |
771 | unsigned long left = 0; | |
884f4f66 | 772 | unsigned long desc_size; |
481f75c0 | 773 | efi_memory_desc_t *md; |
202f9d0a | 774 | |
884f4f66 MF |
775 | desc_size = efi.memmap.desc_size; |
776 | ||
a5caa209 MF |
777 | p = NULL; |
778 | while ((p = efi_map_next_entry(p))) { | |
5b83683f | 779 | md = p; |
70087011 JB |
780 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) { |
781 | #ifdef CONFIG_X86_64 | |
782 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
783 | md->type != EFI_BOOT_SERVICES_DATA) | |
784 | #endif | |
785 | continue; | |
786 | } | |
1c083eb2 | 787 | |
d2f7cbe7 | 788 | efi_map_region(md); |
481f75c0 DY |
789 | get_systab_virt_addr(md); |
790 | ||
884f4f66 | 791 | if (left < desc_size) { |
b7b898ae BP |
792 | new_memmap = realloc_pages(new_memmap, *pg_shift); |
793 | if (!new_memmap) | |
794 | return NULL; | |
795 | ||
796 | left += PAGE_SIZE << *pg_shift; | |
797 | (*pg_shift)++; | |
798 | } | |
799 | ||
884f4f66 | 800 | memcpy(new_memmap + (*count * desc_size), md, desc_size); |
b7b898ae | 801 | |
884f4f66 | 802 | left -= desc_size; |
481f75c0 DY |
803 | (*count)++; |
804 | } | |
d2f7cbe7 | 805 | |
481f75c0 | 806 | return new_memmap; |
481f75c0 DY |
807 | } |
808 | ||
fabb37c7 BP |
809 | static void __init kexec_enter_virtual_mode(void) |
810 | { | |
2965faa5 | 811 | #ifdef CONFIG_KEXEC_CORE |
fabb37c7 | 812 | efi_memory_desc_t *md; |
753b11ef | 813 | unsigned int num_pages; |
fabb37c7 BP |
814 | |
815 | efi.systab = NULL; | |
816 | ||
817 | /* | |
818 | * We don't do virtual mode, since we don't do runtime services, on | |
819 | * non-native EFI | |
820 | */ | |
821 | if (!efi_is_native()) { | |
822 | efi_unmap_memmap(); | |
a5a750a9 | 823 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 BP |
824 | return; |
825 | } | |
826 | ||
753b11ef MF |
827 | if (efi_alloc_page_tables()) { |
828 | pr_err("Failed to allocate EFI page tables\n"); | |
829 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
830 | return; | |
831 | } | |
832 | ||
fabb37c7 BP |
833 | /* |
834 | * Map efi regions which were passed via setup_data. The virt_addr is a | |
835 | * fixed addr which was used in first kernel of a kexec boot. | |
836 | */ | |
78ce248f | 837 | for_each_efi_memory_desc(md) { |
fabb37c7 BP |
838 | efi_map_region_fixed(md); /* FIXME: add error handling */ |
839 | get_systab_virt_addr(md); | |
840 | } | |
841 | ||
842 | save_runtime_map(); | |
843 | ||
844 | BUG_ON(!efi.systab); | |
845 | ||
884f4f66 | 846 | num_pages = ALIGN(efi.memmap.nr_map * efi.memmap.desc_size, PAGE_SIZE); |
753b11ef MF |
847 | num_pages >>= PAGE_SHIFT; |
848 | ||
884f4f66 | 849 | if (efi_setup_page_tables(efi.memmap.phys_map, num_pages)) { |
753b11ef MF |
850 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
851 | return; | |
852 | } | |
853 | ||
fabb37c7 BP |
854 | efi_sync_low_kernel_mappings(); |
855 | ||
856 | /* | |
857 | * Now that EFI is in virtual mode, update the function | |
858 | * pointers in the runtime service table to the new virtual addresses. | |
859 | * | |
860 | * Call EFI services through wrapper functions. | |
861 | */ | |
862 | efi.runtime_version = efi_systab.hdr.revision; | |
994448f1 | 863 | |
022ee6c5 | 864 | efi_native_runtime_setup(); |
994448f1 | 865 | |
fabb37c7 | 866 | efi.set_virtual_address_map = NULL; |
fabb37c7 BP |
867 | |
868 | if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX)) | |
869 | runtime_code_page_mkexec(); | |
870 | ||
871 | /* clean DUMMY object */ | |
eeb9db09 | 872 | efi_delete_dummy_variable(); |
fabb37c7 BP |
873 | #endif |
874 | } | |
875 | ||
481f75c0 DY |
876 | /* |
877 | * This function will switch the EFI runtime services to virtual mode. | |
878 | * Essentially, we look through the EFI memmap and map every region that | |
879 | * has the runtime attribute bit set in its memory descriptor into the | |
67a9108e | 880 | * efi_pgd page table. |
481f75c0 DY |
881 | * |
882 | * The old method which used to update that memory descriptor with the | |
883 | * virtual address obtained from ioremap() is still supported when the | |
884 | * kernel is booted with efi=old_map on its command line. Same old | |
885 | * method enabled the runtime services to be called without having to | |
886 | * thunk back into physical mode for every invocation. | |
887 | * | |
888 | * The new method does a pagetable switch in a preemption-safe manner | |
889 | * so that we're in a different address space when calling a runtime | |
67a9108e MF |
890 | * function. For function arguments passing we do copy the PUDs of the |
891 | * kernel page table into efi_pgd prior to each call. | |
1fec0533 DY |
892 | * |
893 | * Specially for kexec boot, efi runtime maps in previous kernel should | |
894 | * be passed in via setup_data. In that case runtime ranges will be mapped | |
fabb37c7 BP |
895 | * to the same virtual addresses as the first kernel, see |
896 | * kexec_enter_virtual_mode(). | |
481f75c0 | 897 | */ |
fabb37c7 | 898 | static void __init __efi_enter_virtual_mode(void) |
481f75c0 | 899 | { |
fabb37c7 | 900 | int count = 0, pg_shift = 0; |
481f75c0 | 901 | void *new_memmap = NULL; |
b7b898ae | 902 | efi_status_t status; |
1c083eb2 | 903 | |
481f75c0 | 904 | efi.systab = NULL; |
d2f7cbe7 | 905 | |
67a9108e MF |
906 | if (efi_alloc_page_tables()) { |
907 | pr_err("Failed to allocate EFI page tables\n"); | |
908 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
909 | return; | |
910 | } | |
911 | ||
fabb37c7 BP |
912 | efi_merge_regions(); |
913 | new_memmap = efi_map_regions(&count, &pg_shift); | |
914 | if (!new_memmap) { | |
915 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); | |
a5a750a9 | 916 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 | 917 | return; |
b7b898ae | 918 | } |
926172d4 | 919 | |
fabb37c7 BP |
920 | save_runtime_map(); |
921 | ||
5b83683f HY |
922 | BUG_ON(!efi.systab); |
923 | ||
a5a750a9 DY |
924 | if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) { |
925 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
fabb37c7 | 926 | return; |
a5a750a9 | 927 | } |
b7b898ae | 928 | |
d2f7cbe7 BP |
929 | efi_sync_low_kernel_mappings(); |
930 | ||
994448f1 MF |
931 | if (efi_is_native()) { |
932 | status = phys_efi_set_virtual_address_map( | |
884f4f66 MF |
933 | efi.memmap.desc_size * count, |
934 | efi.memmap.desc_size, | |
935 | efi.memmap.desc_version, | |
994448f1 MF |
936 | (efi_memory_desc_t *)__pa(new_memmap)); |
937 | } else { | |
938 | status = efi_thunk_set_virtual_address_map( | |
939 | efi_phys.set_virtual_address_map, | |
884f4f66 MF |
940 | efi.memmap.desc_size * count, |
941 | efi.memmap.desc_size, | |
942 | efi.memmap.desc_version, | |
994448f1 MF |
943 | (efi_memory_desc_t *)__pa(new_memmap)); |
944 | } | |
1fec0533 | 945 | |
fabb37c7 BP |
946 | if (status != EFI_SUCCESS) { |
947 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", | |
948 | status); | |
949 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
5b83683f HY |
950 | } |
951 | ||
952 | /* | |
953 | * Now that EFI is in virtual mode, update the function | |
954 | * pointers in the runtime service table to the new virtual addresses. | |
955 | * | |
956 | * Call EFI services through wrapper functions. | |
957 | */ | |
712ba9e9 | 958 | efi.runtime_version = efi_systab.hdr.revision; |
4f9dbcfc MF |
959 | |
960 | if (efi_is_native()) | |
022ee6c5 | 961 | efi_native_runtime_setup(); |
4f9dbcfc MF |
962 | else |
963 | efi_thunk_runtime_setup(); | |
964 | ||
2b5e8ef3 | 965 | efi.set_virtual_address_map = NULL; |
d2f7cbe7 | 966 | |
6d0cc887 SP |
967 | /* |
968 | * Apply more restrictive page table mapping attributes now that | |
969 | * SVAM() has been called and the firmware has performed all | |
970 | * necessary relocation fixups for the new virtual addresses. | |
971 | */ | |
972 | efi_runtime_update_mappings(); | |
973 | efi_dump_pagetable(); | |
1adbfa35 | 974 | |
b7b898ae | 975 | /* |
67a9108e MF |
976 | * We mapped the descriptor array into the EFI pagetable above |
977 | * but we're not unmapping it here because if we're running in | |
978 | * EFI mixed mode we need all of memory to be accessible when | |
979 | * we pass parameters to the EFI runtime services in the | |
980 | * thunking code. | |
b7b898ae | 981 | */ |
fabb37c7 | 982 | free_pages((unsigned long)new_memmap, pg_shift); |
f8b84043 MG |
983 | |
984 | /* clean DUMMY object */ | |
eeb9db09 | 985 | efi_delete_dummy_variable(); |
5b83683f HY |
986 | } |
987 | ||
fabb37c7 BP |
988 | void __init efi_enter_virtual_mode(void) |
989 | { | |
9f27bc54 DK |
990 | if (efi_enabled(EFI_PARAVIRT)) |
991 | return; | |
992 | ||
fabb37c7 BP |
993 | if (efi_setup) |
994 | kexec_enter_virtual_mode(); | |
995 | else | |
996 | __efi_enter_virtual_mode(); | |
997 | } | |
998 | ||
5b83683f HY |
999 | /* |
1000 | * Convenience functions to obtain memory types and attributes | |
1001 | */ | |
1002 | u32 efi_mem_type(unsigned long phys_addr) | |
1003 | { | |
1004 | efi_memory_desc_t *md; | |
5b83683f | 1005 | |
83e68189 MF |
1006 | if (!efi_enabled(EFI_MEMMAP)) |
1007 | return 0; | |
1008 | ||
78ce248f | 1009 | for_each_efi_memory_desc(md) { |
5b83683f HY |
1010 | if ((md->phys_addr <= phys_addr) && |
1011 | (phys_addr < (md->phys_addr + | |
1012 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
1013 | return md->type; | |
1014 | } | |
1015 | return 0; | |
1016 | } | |
1017 | ||
5ae3683c | 1018 | static int __init arch_parse_efi_cmdline(char *str) |
d2f7cbe7 | 1019 | { |
9115c758 RN |
1020 | if (!str) { |
1021 | pr_warn("need at least one option\n"); | |
1022 | return -EINVAL; | |
1023 | } | |
1024 | ||
6ccc72b8 DY |
1025 | if (parse_option_str(str, "old_map")) |
1026 | set_bit(EFI_OLD_MEMMAP, &efi.flags); | |
d2f7cbe7 BP |
1027 | |
1028 | return 0; | |
1029 | } | |
5ae3683c | 1030 | early_param("efi", arch_parse_efi_cmdline); |