Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5b83683f HY |
2 | /* |
3 | * Common EFI (Extensible Firmware Interface) support functions | |
4 | * Based on Extensible Firmware Interface Specification version 1.0 | |
5 | * | |
6 | * Copyright (C) 1999 VA Linux Systems | |
7 | * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> | |
8 | * Copyright (C) 1999-2002 Hewlett-Packard Co. | |
9 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
10 | * Stephane Eranian <eranian@hpl.hp.com> | |
11 | * Copyright (C) 2005-2008 Intel Co. | |
12 | * Fenghua Yu <fenghua.yu@intel.com> | |
13 | * Bibo Mao <bibo.mao@intel.com> | |
14 | * Chandramouli Narayanan <mouli@linux.intel.com> | |
15 | * Huang Ying <ying.huang@intel.com> | |
d2f7cbe7 BP |
16 | * Copyright (C) 2013 SuSE Labs |
17 | * Borislav Petkov <bp@suse.de> - runtime services VA mapping | |
5b83683f HY |
18 | * |
19 | * Copied from efi_32.c to eliminate the duplicated code between EFI | |
20 | * 32/64 support code. --ying 2007-10-26 | |
21 | * | |
22 | * All EFI Runtime Services are not implemented yet as EFI only | |
23 | * supports physical mode addressing on SoftSDV. This is to be fixed | |
24 | * in a future version. --drummond 1999-07-20 | |
25 | * | |
26 | * Implemented EFI runtime services and virtual mode calls. --davidm | |
27 | * | |
28 | * Goutham Rao: <goutham.rao@intel.com> | |
29 | * Skip non-WB memory and ignore empty memory ranges. | |
30 | */ | |
31 | ||
e3cb3f5a OJ |
32 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
33 | ||
5b83683f HY |
34 | #include <linux/kernel.h> |
35 | #include <linux/init.h> | |
36 | #include <linux/efi.h> | |
2223af38 | 37 | #include <linux/efi-bgrt.h> |
69c60c88 | 38 | #include <linux/export.h> |
5b83683f | 39 | #include <linux/bootmem.h> |
0d01ff25 | 40 | #include <linux/slab.h> |
a9ce6bc1 | 41 | #include <linux/memblock.h> |
5b83683f HY |
42 | #include <linux/spinlock.h> |
43 | #include <linux/uaccess.h> | |
44 | #include <linux/time.h> | |
45 | #include <linux/io.h> | |
46 | #include <linux/reboot.h> | |
47 | #include <linux/bcd.h> | |
48 | ||
49 | #include <asm/setup.h> | |
50 | #include <asm/efi.h> | |
5520b7e7 | 51 | #include <asm/e820/api.h> |
5b83683f | 52 | #include <asm/time.h> |
d1163651 | 53 | #include <asm/set_memory.h> |
a2172e25 | 54 | #include <asm/tlbflush.h> |
7bd867df | 55 | #include <asm/x86_init.h> |
a5d90c92 | 56 | #include <asm/uv/uv.h> |
5b83683f | 57 | |
ecaea42e | 58 | static struct efi efi_phys __initdata; |
5b83683f HY |
59 | static efi_system_table_t efi_systab __initdata; |
60 | ||
9b7d2049 | 61 | static efi_config_table_type_t arch_tables[] __initdata = { |
272686bf LL |
62 | #ifdef CONFIG_X86_UV |
63 | {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab}, | |
64 | #endif | |
722da9d2 | 65 | {NULL_GUID, NULL, NULL}, |
272686bf LL |
66 | }; |
67 | ||
1fec0533 | 68 | u64 efi_setup; /* efi setup_data physical address */ |
926172d4 | 69 | |
60920685 | 70 | static int add_efi_memmap __initdata; |
200001eb PJ |
71 | static int __init setup_add_efi_memmap(char *arg) |
72 | { | |
73 | add_efi_memmap = 1; | |
74 | return 0; | |
75 | } | |
76 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
77 | ||
5b83683f HY |
78 | static efi_status_t __init phys_efi_set_virtual_address_map( |
79 | unsigned long memory_map_size, | |
80 | unsigned long descriptor_size, | |
81 | u32 descriptor_version, | |
82 | efi_memory_desc_t *virtual_map) | |
83 | { | |
84 | efi_status_t status; | |
23a0d4e8 | 85 | unsigned long flags; |
744937b0 | 86 | pgd_t *save_pgd; |
5b83683f | 87 | |
744937b0 | 88 | save_pgd = efi_call_phys_prolog(); |
23a0d4e8 IM |
89 | |
90 | /* Disable interrupts around EFI calls: */ | |
91 | local_irq_save(flags); | |
62fa6e69 MF |
92 | status = efi_call_phys(efi_phys.set_virtual_address_map, |
93 | memory_map_size, descriptor_size, | |
94 | descriptor_version, virtual_map); | |
23a0d4e8 IM |
95 | local_irq_restore(flags); |
96 | ||
744937b0 | 97 | efi_call_phys_epilog(save_pgd); |
23a0d4e8 | 98 | |
5b83683f HY |
99 | return status; |
100 | } | |
101 | ||
b05b9f5f TL |
102 | void __init efi_find_mirror(void) |
103 | { | |
78ce248f | 104 | efi_memory_desc_t *md; |
b05b9f5f TL |
105 | u64 mirror_size = 0, total_size = 0; |
106 | ||
78ce248f | 107 | for_each_efi_memory_desc(md) { |
b05b9f5f TL |
108 | unsigned long long start = md->phys_addr; |
109 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
110 | ||
111 | total_size += size; | |
112 | if (md->attribute & EFI_MEMORY_MORE_RELIABLE) { | |
113 | memblock_mark_mirror(start, size); | |
114 | mirror_size += size; | |
115 | } | |
116 | } | |
117 | if (mirror_size) | |
118 | pr_info("Memory: %lldM/%lldM mirrored memory\n", | |
119 | mirror_size>>20, total_size>>20); | |
120 | } | |
121 | ||
69c91893 PJ |
122 | /* |
123 | * Tell the kernel about the EFI memory map. This might include | |
124 | * more than the max 128 entries that can fit in the e820 legacy | |
125 | * (zeropage) memory map. | |
126 | */ | |
127 | ||
200001eb | 128 | static void __init do_add_efi_memmap(void) |
69c91893 | 129 | { |
78ce248f | 130 | efi_memory_desc_t *md; |
69c91893 | 131 | |
78ce248f | 132 | for_each_efi_memory_desc(md) { |
69c91893 PJ |
133 | unsigned long long start = md->phys_addr; |
134 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
135 | int e820_type; | |
136 | ||
e2a71476 CW |
137 | switch (md->type) { |
138 | case EFI_LOADER_CODE: | |
139 | case EFI_LOADER_DATA: | |
140 | case EFI_BOOT_SERVICES_CODE: | |
141 | case EFI_BOOT_SERVICES_DATA: | |
142 | case EFI_CONVENTIONAL_MEMORY: | |
143 | if (md->attribute & EFI_MEMORY_WB) | |
09821ff1 | 144 | e820_type = E820_TYPE_RAM; |
e2a71476 | 145 | else |
09821ff1 | 146 | e820_type = E820_TYPE_RESERVED; |
e2a71476 CW |
147 | break; |
148 | case EFI_ACPI_RECLAIM_MEMORY: | |
09821ff1 | 149 | e820_type = E820_TYPE_ACPI; |
e2a71476 CW |
150 | break; |
151 | case EFI_ACPI_MEMORY_NVS: | |
09821ff1 | 152 | e820_type = E820_TYPE_NVS; |
e2a71476 CW |
153 | break; |
154 | case EFI_UNUSABLE_MEMORY: | |
09821ff1 | 155 | e820_type = E820_TYPE_UNUSABLE; |
e2a71476 | 156 | break; |
ad5fb870 | 157 | case EFI_PERSISTENT_MEMORY: |
09821ff1 | 158 | e820_type = E820_TYPE_PMEM; |
ad5fb870 | 159 | break; |
e2a71476 CW |
160 | default: |
161 | /* | |
162 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
163 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
164 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
165 | */ | |
09821ff1 | 166 | e820_type = E820_TYPE_RESERVED; |
e2a71476 CW |
167 | break; |
168 | } | |
ab6bc04c | 169 | e820__range_add(start, size, e820_type); |
69c91893 | 170 | } |
f9748fa0 | 171 | e820__update_table(e820_table); |
69c91893 PJ |
172 | } |
173 | ||
1adbfa35 | 174 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 175 | { |
15b9c359 | 176 | struct efi_info *e = &boot_params.efi_info; |
9479c7ce | 177 | struct efi_memory_map_data data; |
44511fb9 | 178 | phys_addr_t pmap; |
9479c7ce | 179 | int rv; |
ecacf09f | 180 | |
9f27bc54 DK |
181 | if (efi_enabled(EFI_PARAVIRT)) |
182 | return 0; | |
183 | ||
05486fa7 | 184 | #ifdef CONFIG_X86_32 |
1adbfa35 | 185 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 186 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
187 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
188 | return -EINVAL; | |
189 | } | |
15b9c359 | 190 | pmap = e->efi_memmap; |
05486fa7 | 191 | #else |
15b9c359 | 192 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 193 | #endif |
9479c7ce MF |
194 | data.phys_map = pmap; |
195 | data.size = e->efi_memmap_size; | |
196 | data.desc_size = e->efi_memdesc_size; | |
197 | data.desc_version = e->efi_memdesc_version; | |
198 | ||
199 | rv = efi_memmap_init_early(&data); | |
200 | if (rv) | |
201 | return rv; | |
202 | ||
203 | if (add_efi_memmap) | |
204 | do_add_efi_memmap(); | |
1adbfa35 | 205 | |
0d054ad9 AB |
206 | WARN(efi.memmap.desc_version != 1, |
207 | "Unexpected EFI_MEMORY_DESCRIPTOR version %ld", | |
208 | efi.memmap.desc_version); | |
209 | ||
884f4f66 | 210 | memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size); |
258f6fd7 | 211 | |
1adbfa35 | 212 | return 0; |
ecacf09f HY |
213 | } |
214 | ||
0100a3e6 PJ |
215 | #define OVERFLOW_ADDR_SHIFT (64 - EFI_PAGE_SHIFT) |
216 | #define OVERFLOW_ADDR_MASK (U64_MAX << OVERFLOW_ADDR_SHIFT) | |
217 | #define U64_HIGH_BIT (~(U64_MAX >> 1)) | |
218 | ||
219 | static bool __init efi_memmap_entry_valid(const efi_memory_desc_t *md, int i) | |
220 | { | |
221 | u64 end = (md->num_pages << EFI_PAGE_SHIFT) + md->phys_addr - 1; | |
222 | u64 end_hi = 0; | |
223 | char buf[64]; | |
224 | ||
225 | if (md->num_pages == 0) { | |
226 | end = 0; | |
227 | } else if (md->num_pages > EFI_PAGES_MAX || | |
228 | EFI_PAGES_MAX - md->num_pages < | |
229 | (md->phys_addr >> EFI_PAGE_SHIFT)) { | |
230 | end_hi = (md->num_pages & OVERFLOW_ADDR_MASK) | |
231 | >> OVERFLOW_ADDR_SHIFT; | |
232 | ||
233 | if ((md->phys_addr & U64_HIGH_BIT) && !(end & U64_HIGH_BIT)) | |
234 | end_hi += 1; | |
235 | } else { | |
236 | return true; | |
237 | } | |
238 | ||
239 | pr_warn_once(FW_BUG "Invalid EFI memory map entries:\n"); | |
240 | ||
241 | if (end_hi) { | |
242 | pr_warn("mem%02u: %s range=[0x%016llx-0x%llx%016llx] (invalid)\n", | |
243 | i, efi_md_typeattr_format(buf, sizeof(buf), md), | |
244 | md->phys_addr, end_hi, end); | |
245 | } else { | |
246 | pr_warn("mem%02u: %s range=[0x%016llx-0x%016llx] (invalid)\n", | |
247 | i, efi_md_typeattr_format(buf, sizeof(buf), md), | |
248 | md->phys_addr, end); | |
249 | } | |
250 | return false; | |
251 | } | |
252 | ||
253 | static void __init efi_clean_memmap(void) | |
254 | { | |
255 | efi_memory_desc_t *out = efi.memmap.map; | |
256 | const efi_memory_desc_t *in = out; | |
257 | const efi_memory_desc_t *end = efi.memmap.map_end; | |
258 | int i, n_removal; | |
259 | ||
260 | for (i = n_removal = 0; in < end; i++) { | |
261 | if (efi_memmap_entry_valid(in, i)) { | |
262 | if (out != in) | |
263 | memcpy(out, in, efi.memmap.desc_size); | |
264 | out = (void *)out + efi.memmap.desc_size; | |
265 | } else { | |
266 | n_removal++; | |
267 | } | |
268 | in = (void *)in + efi.memmap.desc_size; | |
269 | } | |
270 | ||
271 | if (n_removal > 0) { | |
272 | u64 size = efi.memmap.nr_map - n_removal; | |
273 | ||
274 | pr_warn("Removing %d invalid memory map entries.\n", n_removal); | |
275 | efi_memmap_install(efi.memmap.phys_map, size); | |
276 | } | |
277 | } | |
278 | ||
0bbea1ce | 279 | void __init efi_print_memmap(void) |
5b83683f HY |
280 | { |
281 | efi_memory_desc_t *md; | |
78ce248f | 282 | int i = 0; |
5b83683f | 283 | |
78ce248f | 284 | for_each_efi_memory_desc(md) { |
ace1d121 LE |
285 | char buf[64]; |
286 | ||
1e82b947 | 287 | pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n", |
78ce248f | 288 | i++, efi_md_typeattr_format(buf, sizeof(buf), md), |
ace1d121 | 289 | md->phys_addr, |
1e82b947 | 290 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1, |
5b83683f HY |
291 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); |
292 | } | |
f4fccac0 | 293 | } |
5b83683f | 294 | |
140bf275 | 295 | static int __init efi_systab_init(void *phys) |
5b83683f | 296 | { |
83e68189 | 297 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 | 298 | efi_system_table_64_t *systab64; |
1fec0533 | 299 | struct efi_setup_data *data = NULL; |
1adbfa35 OJ |
300 | u64 tmp = 0; |
301 | ||
1fec0533 DY |
302 | if (efi_setup) { |
303 | data = early_memremap(efi_setup, sizeof(*data)); | |
304 | if (!data) | |
305 | return -ENOMEM; | |
306 | } | |
abc93f8e | 307 | systab64 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
308 | sizeof(*systab64)); |
309 | if (systab64 == NULL) { | |
310 | pr_err("Couldn't map the system table!\n"); | |
1fec0533 | 311 | if (data) |
abc93f8e | 312 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
313 | return -ENOMEM; |
314 | } | |
315 | ||
316 | efi_systab.hdr = systab64->hdr; | |
1fec0533 DY |
317 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
318 | systab64->fw_vendor; | |
319 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; | |
1adbfa35 OJ |
320 | efi_systab.fw_revision = systab64->fw_revision; |
321 | efi_systab.con_in_handle = systab64->con_in_handle; | |
322 | tmp |= systab64->con_in_handle; | |
323 | efi_systab.con_in = systab64->con_in; | |
324 | tmp |= systab64->con_in; | |
325 | efi_systab.con_out_handle = systab64->con_out_handle; | |
326 | tmp |= systab64->con_out_handle; | |
327 | efi_systab.con_out = systab64->con_out; | |
328 | tmp |= systab64->con_out; | |
329 | efi_systab.stderr_handle = systab64->stderr_handle; | |
330 | tmp |= systab64->stderr_handle; | |
331 | efi_systab.stderr = systab64->stderr; | |
332 | tmp |= systab64->stderr; | |
1fec0533 DY |
333 | efi_systab.runtime = data ? |
334 | (void *)(unsigned long)data->runtime : | |
335 | (void *)(unsigned long)systab64->runtime; | |
336 | tmp |= data ? data->runtime : systab64->runtime; | |
1adbfa35 OJ |
337 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
338 | tmp |= systab64->boottime; | |
339 | efi_systab.nr_tables = systab64->nr_tables; | |
1fec0533 DY |
340 | efi_systab.tables = data ? (unsigned long)data->tables : |
341 | systab64->tables; | |
342 | tmp |= data ? data->tables : systab64->tables; | |
1adbfa35 | 343 | |
abc93f8e | 344 | early_memunmap(systab64, sizeof(*systab64)); |
1fec0533 | 345 | if (data) |
abc93f8e | 346 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
347 | #ifdef CONFIG_X86_32 |
348 | if (tmp >> 32) { | |
349 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
350 | return -EINVAL; | |
351 | } | |
352 | #endif | |
353 | } else { | |
354 | efi_system_table_32_t *systab32; | |
355 | ||
abc93f8e | 356 | systab32 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
357 | sizeof(*systab32)); |
358 | if (systab32 == NULL) { | |
359 | pr_err("Couldn't map the system table!\n"); | |
360 | return -ENOMEM; | |
361 | } | |
362 | ||
363 | efi_systab.hdr = systab32->hdr; | |
364 | efi_systab.fw_vendor = systab32->fw_vendor; | |
365 | efi_systab.fw_revision = systab32->fw_revision; | |
366 | efi_systab.con_in_handle = systab32->con_in_handle; | |
367 | efi_systab.con_in = systab32->con_in; | |
368 | efi_systab.con_out_handle = systab32->con_out_handle; | |
369 | efi_systab.con_out = systab32->con_out; | |
370 | efi_systab.stderr_handle = systab32->stderr_handle; | |
371 | efi_systab.stderr = systab32->stderr; | |
372 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
373 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
374 | efi_systab.nr_tables = systab32->nr_tables; | |
375 | efi_systab.tables = systab32->tables; | |
376 | ||
abc93f8e | 377 | early_memunmap(systab32, sizeof(*systab32)); |
140bf275 | 378 | } |
1adbfa35 | 379 | |
5b83683f HY |
380 | efi.systab = &efi_systab; |
381 | ||
382 | /* | |
383 | * Verify the EFI Table | |
384 | */ | |
140bf275 | 385 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 386 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
387 | return -EINVAL; |
388 | } | |
5b83683f | 389 | if ((efi.systab->hdr.revision >> 16) == 0) |
9b7d2049 | 390 | pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n", |
5b83683f HY |
391 | efi.systab->hdr.revision >> 16, |
392 | efi.systab->hdr.revision & 0xffff); | |
140bf275 OJ |
393 | |
394 | return 0; | |
83e7ee66 | 395 | } |
5b83683f | 396 | |
4f9dbcfc | 397 | static int __init efi_runtime_init32(void) |
83e7ee66 | 398 | { |
4f9dbcfc MF |
399 | efi_runtime_services_32_t *runtime; |
400 | ||
abc93f8e | 401 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc MF |
402 | sizeof(efi_runtime_services_32_t)); |
403 | if (!runtime) { | |
404 | pr_err("Could not map the runtime service table!\n"); | |
405 | return -ENOMEM; | |
406 | } | |
5b83683f HY |
407 | |
408 | /* | |
0ce4605c MK |
409 | * We will only need *early* access to the SetVirtualAddressMap |
410 | * EFI runtime service. All other runtime services will be called | |
411 | * via the virtual mapping. | |
5b83683f | 412 | */ |
4f9dbcfc MF |
413 | efi_phys.set_virtual_address_map = |
414 | (efi_set_virtual_address_map_t *) | |
415 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 416 | early_memunmap(runtime, sizeof(efi_runtime_services_32_t)); |
4f9dbcfc MF |
417 | |
418 | return 0; | |
419 | } | |
420 | ||
421 | static int __init efi_runtime_init64(void) | |
422 | { | |
423 | efi_runtime_services_64_t *runtime; | |
424 | ||
abc93f8e | 425 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc | 426 | sizeof(efi_runtime_services_64_t)); |
140bf275 | 427 | if (!runtime) { |
e3cb3f5a | 428 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
429 | return -ENOMEM; |
430 | } | |
4f9dbcfc | 431 | |
140bf275 | 432 | /* |
0ce4605c MK |
433 | * We will only need *early* access to the SetVirtualAddressMap |
434 | * EFI runtime service. All other runtime services will be called | |
435 | * via the virtual mapping. | |
140bf275 | 436 | */ |
140bf275 | 437 | efi_phys.set_virtual_address_map = |
4f9dbcfc MF |
438 | (efi_set_virtual_address_map_t *) |
439 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 440 | early_memunmap(runtime, sizeof(efi_runtime_services_64_t)); |
4f9dbcfc MF |
441 | |
442 | return 0; | |
443 | } | |
444 | ||
445 | static int __init efi_runtime_init(void) | |
446 | { | |
447 | int rv; | |
448 | ||
449 | /* | |
450 | * Check out the runtime services table. We need to map | |
451 | * the runtime services table so that we can grab the physical | |
452 | * address of several of the EFI runtime functions, needed to | |
453 | * set the firmware into virtual mode. | |
9f27bc54 DK |
454 | * |
455 | * When EFI_PARAVIRT is in force then we could not map runtime | |
456 | * service memory region because we do not have direct access to it. | |
457 | * However, runtime services are available through proxy functions | |
458 | * (e.g. in case of Xen dom0 EFI implementation they call special | |
459 | * hypercall which executes relevant EFI functions) and that is why | |
460 | * they are always enabled. | |
4f9dbcfc | 461 | */ |
4f9dbcfc | 462 | |
9f27bc54 DK |
463 | if (!efi_enabled(EFI_PARAVIRT)) { |
464 | if (efi_enabled(EFI_64BIT)) | |
465 | rv = efi_runtime_init64(); | |
466 | else | |
467 | rv = efi_runtime_init32(); | |
468 | ||
469 | if (rv) | |
470 | return rv; | |
471 | } | |
140bf275 | 472 | |
0f8093a9 MF |
473 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
474 | ||
140bf275 | 475 | return 0; |
83e7ee66 | 476 | } |
5b83683f | 477 | |
83e7ee66 OJ |
478 | void __init efi_init(void) |
479 | { | |
480 | efi_char16_t *c16; | |
481 | char vendor[100] = "unknown"; | |
482 | int i = 0; | |
483 | void *tmp; | |
484 | ||
485 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
486 | if (boot_params.efi_info.efi_systab_hi || |
487 | boot_params.efi_info.efi_memmap_hi) { | |
488 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
489 | return; |
490 | } | |
83e7ee66 OJ |
491 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
492 | #else | |
493 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
494 | (boot_params.efi_info.efi_systab | |
495 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
496 | #endif |
497 | ||
83e68189 | 498 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 499 | return; |
83e68189 | 500 | |
a0998eb1 DY |
501 | efi.config_table = (unsigned long)efi.systab->tables; |
502 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; | |
503 | efi.runtime = (unsigned long)efi.systab->runtime; | |
504 | ||
83e7ee66 OJ |
505 | /* |
506 | * Show what we know for posterity | |
507 | */ | |
abc93f8e | 508 | c16 = tmp = early_memremap(efi.systab->fw_vendor, 2); |
83e7ee66 OJ |
509 | if (c16) { |
510 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
511 | vendor[i] = *c16++; | |
512 | vendor[i] = '\0'; | |
513 | } else | |
e3cb3f5a | 514 | pr_err("Could not map the firmware vendor!\n"); |
abc93f8e | 515 | early_memunmap(tmp, 2); |
83e7ee66 | 516 | |
e3cb3f5a OJ |
517 | pr_info("EFI v%u.%.02u by %s\n", |
518 | efi.systab->hdr.revision >> 16, | |
519 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 520 | |
1fec0533 DY |
521 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
522 | return; | |
523 | ||
272686bf | 524 | if (efi_config_init(arch_tables)) |
140bf275 | 525 | return; |
83e68189 | 526 | |
1adbfa35 OJ |
527 | /* |
528 | * Note: We currently don't support runtime services on an EFI | |
529 | * that doesn't match the kernel 32/64-bit mode. | |
530 | */ | |
531 | ||
7d453eee | 532 | if (!efi_runtime_supported()) |
1adbfa35 | 533 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 534 | else { |
9479c7ce MF |
535 | if (efi_runtime_disabled() || efi_runtime_init()) { |
536 | efi_memmap_unmap(); | |
83e68189 | 537 | return; |
9479c7ce | 538 | } |
140bf275 | 539 | } |
83e68189 | 540 | |
0100a3e6 PJ |
541 | efi_clean_memmap(); |
542 | ||
fed6cefe | 543 | if (efi_enabled(EFI_DBG)) |
0bbea1ce | 544 | efi_print_memmap(); |
5b83683f HY |
545 | } |
546 | ||
9cd2b07c MG |
547 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
548 | { | |
549 | u64 addr, npages; | |
550 | ||
551 | addr = md->virt_addr; | |
552 | npages = md->num_pages; | |
553 | ||
554 | memrange_efi_to_native(&addr, &npages); | |
555 | ||
556 | if (executable) | |
557 | set_memory_x(addr, npages); | |
558 | else | |
559 | set_memory_nx(addr, npages); | |
560 | } | |
561 | ||
c55d016f | 562 | void __init runtime_code_page_mkexec(void) |
a2172e25 HY |
563 | { |
564 | efi_memory_desc_t *md; | |
a2172e25 | 565 | |
a2172e25 | 566 | /* Make EFI runtime service code area executable */ |
78ce248f | 567 | for_each_efi_memory_desc(md) { |
1c083eb2 HY |
568 | if (md->type != EFI_RUNTIME_SERVICES_CODE) |
569 | continue; | |
570 | ||
9cd2b07c | 571 | efi_set_executable(md, true); |
a2172e25 | 572 | } |
a2172e25 | 573 | } |
a2172e25 | 574 | |
4e78eb05 | 575 | void __init efi_memory_uc(u64 addr, unsigned long size) |
3e8fa263 MF |
576 | { |
577 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
578 | u64 npages; | |
579 | ||
580 | npages = round_up(size, page_shift) / page_shift; | |
581 | memrange_efi_to_native(&addr, &npages); | |
582 | set_memory_uc(addr, npages); | |
583 | } | |
584 | ||
d2f7cbe7 BP |
585 | void __init old_map_region(efi_memory_desc_t *md) |
586 | { | |
587 | u64 start_pfn, end_pfn, end; | |
588 | unsigned long size; | |
589 | void *va; | |
590 | ||
591 | start_pfn = PFN_DOWN(md->phys_addr); | |
592 | size = md->num_pages << PAGE_SHIFT; | |
593 | end = md->phys_addr + size; | |
594 | end_pfn = PFN_UP(end); | |
595 | ||
596 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { | |
597 | va = __va(md->phys_addr); | |
598 | ||
599 | if (!(md->attribute & EFI_MEMORY_WB)) | |
600 | efi_memory_uc((u64)(unsigned long)va, size); | |
601 | } else | |
602 | va = efi_ioremap(md->phys_addr, size, | |
603 | md->type, md->attribute); | |
604 | ||
605 | md->virt_addr = (u64) (unsigned long) va; | |
606 | if (!va) | |
607 | pr_err("ioremap of 0x%llX failed!\n", | |
608 | (unsigned long long)md->phys_addr); | |
609 | } | |
610 | ||
481f75c0 DY |
611 | /* Merge contiguous regions of the same type and attribute */ |
612 | static void __init efi_merge_regions(void) | |
5b83683f | 613 | { |
202f9d0a | 614 | efi_memory_desc_t *md, *prev_md = NULL; |
202f9d0a | 615 | |
78ce248f | 616 | for_each_efi_memory_desc(md) { |
202f9d0a | 617 | u64 prev_size; |
202f9d0a MG |
618 | |
619 | if (!prev_md) { | |
620 | prev_md = md; | |
621 | continue; | |
622 | } | |
623 | ||
624 | if (prev_md->type != md->type || | |
625 | prev_md->attribute != md->attribute) { | |
626 | prev_md = md; | |
627 | continue; | |
628 | } | |
629 | ||
630 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
631 | ||
632 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
633 | prev_md->num_pages += md->num_pages; | |
634 | md->type = EFI_RESERVED_TYPE; | |
635 | md->attribute = 0; | |
636 | continue; | |
637 | } | |
638 | prev_md = md; | |
481f75c0 DY |
639 | } |
640 | } | |
641 | ||
642 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) | |
643 | { | |
644 | unsigned long size; | |
645 | u64 end, systab; | |
d2f7cbe7 | 646 | |
481f75c0 DY |
647 | size = md->num_pages << EFI_PAGE_SHIFT; |
648 | end = md->phys_addr + size; | |
649 | systab = (u64)(unsigned long)efi_phys.systab; | |
650 | if (md->phys_addr <= systab && systab < end) { | |
651 | systab += md->virt_addr - md->phys_addr; | |
652 | efi.systab = (efi_system_table_t *)(unsigned long)systab; | |
202f9d0a | 653 | } |
481f75c0 DY |
654 | } |
655 | ||
b7b898ae BP |
656 | static void *realloc_pages(void *old_memmap, int old_shift) |
657 | { | |
658 | void *ret; | |
659 | ||
660 | ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1); | |
661 | if (!ret) | |
662 | goto out; | |
663 | ||
664 | /* | |
665 | * A first-time allocation doesn't have anything to copy. | |
666 | */ | |
667 | if (!old_memmap) | |
668 | return ret; | |
669 | ||
670 | memcpy(ret, old_memmap, PAGE_SIZE << old_shift); | |
671 | ||
672 | out: | |
673 | free_pages((unsigned long)old_memmap, old_shift); | |
674 | return ret; | |
675 | } | |
676 | ||
a5caa209 MF |
677 | /* |
678 | * Iterate the EFI memory map in reverse order because the regions | |
679 | * will be mapped top-down. The end result is the same as if we had | |
680 | * mapped things forward, but doesn't require us to change the | |
681 | * existing implementation of efi_map_region(). | |
682 | */ | |
683 | static inline void *efi_map_next_entry_reverse(void *entry) | |
684 | { | |
685 | /* Initial call */ | |
686 | if (!entry) | |
884f4f66 | 687 | return efi.memmap.map_end - efi.memmap.desc_size; |
a5caa209 | 688 | |
884f4f66 MF |
689 | entry -= efi.memmap.desc_size; |
690 | if (entry < efi.memmap.map) | |
a5caa209 MF |
691 | return NULL; |
692 | ||
693 | return entry; | |
694 | } | |
695 | ||
696 | /* | |
697 | * efi_map_next_entry - Return the next EFI memory map descriptor | |
698 | * @entry: Previous EFI memory map descriptor | |
699 | * | |
700 | * This is a helper function to iterate over the EFI memory map, which | |
701 | * we do in different orders depending on the current configuration. | |
702 | * | |
703 | * To begin traversing the memory map @entry must be %NULL. | |
704 | * | |
705 | * Returns %NULL when we reach the end of the memory map. | |
706 | */ | |
707 | static void *efi_map_next_entry(void *entry) | |
708 | { | |
709 | if (!efi_enabled(EFI_OLD_MEMMAP) && efi_enabled(EFI_64BIT)) { | |
710 | /* | |
711 | * Starting in UEFI v2.5 the EFI_PROPERTIES_TABLE | |
712 | * config table feature requires us to map all entries | |
713 | * in the same order as they appear in the EFI memory | |
714 | * map. That is to say, entry N must have a lower | |
715 | * virtual address than entry N+1. This is because the | |
716 | * firmware toolchain leaves relative references in | |
717 | * the code/data sections, which are split and become | |
718 | * separate EFI memory regions. Mapping things | |
719 | * out-of-order leads to the firmware accessing | |
720 | * unmapped addresses. | |
721 | * | |
722 | * Since we need to map things this way whether or not | |
723 | * the kernel actually makes use of | |
724 | * EFI_PROPERTIES_TABLE, let's just switch to this | |
725 | * scheme by default for 64-bit. | |
726 | */ | |
727 | return efi_map_next_entry_reverse(entry); | |
728 | } | |
729 | ||
730 | /* Initial call */ | |
731 | if (!entry) | |
884f4f66 | 732 | return efi.memmap.map; |
a5caa209 | 733 | |
884f4f66 MF |
734 | entry += efi.memmap.desc_size; |
735 | if (entry >= efi.memmap.map_end) | |
a5caa209 MF |
736 | return NULL; |
737 | ||
738 | return entry; | |
739 | } | |
740 | ||
ab72a27d MF |
741 | static bool should_map_region(efi_memory_desc_t *md) |
742 | { | |
743 | /* | |
744 | * Runtime regions always require runtime mappings (obviously). | |
745 | */ | |
746 | if (md->attribute & EFI_MEMORY_RUNTIME) | |
747 | return true; | |
748 | ||
749 | /* | |
750 | * 32-bit EFI doesn't suffer from the bug that requires us to | |
751 | * reserve boot services regions, and mixed mode support | |
752 | * doesn't exist for 32-bit kernels. | |
753 | */ | |
754 | if (IS_ENABLED(CONFIG_X86_32)) | |
755 | return false; | |
756 | ||
757 | /* | |
758 | * Map all of RAM so that we can access arguments in the 1:1 | |
759 | * mapping when making EFI runtime calls. | |
760 | */ | |
761 | if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_is_native()) { | |
762 | if (md->type == EFI_CONVENTIONAL_MEMORY || | |
763 | md->type == EFI_LOADER_DATA || | |
764 | md->type == EFI_LOADER_CODE) | |
765 | return true; | |
766 | } | |
767 | ||
768 | /* | |
769 | * Map boot services regions as a workaround for buggy | |
770 | * firmware that accesses them even when they shouldn't. | |
771 | * | |
772 | * See efi_{reserve,free}_boot_services(). | |
773 | */ | |
774 | if (md->type == EFI_BOOT_SERVICES_CODE || | |
775 | md->type == EFI_BOOT_SERVICES_DATA) | |
776 | return true; | |
777 | ||
778 | return false; | |
779 | } | |
780 | ||
481f75c0 | 781 | /* |
b7b898ae BP |
782 | * Map the efi memory ranges of the runtime services and update new_mmap with |
783 | * virtual addresses. | |
481f75c0 | 784 | */ |
b7b898ae | 785 | static void * __init efi_map_regions(int *count, int *pg_shift) |
481f75c0 | 786 | { |
b7b898ae BP |
787 | void *p, *new_memmap = NULL; |
788 | unsigned long left = 0; | |
884f4f66 | 789 | unsigned long desc_size; |
481f75c0 | 790 | efi_memory_desc_t *md; |
202f9d0a | 791 | |
884f4f66 MF |
792 | desc_size = efi.memmap.desc_size; |
793 | ||
a5caa209 MF |
794 | p = NULL; |
795 | while ((p = efi_map_next_entry(p))) { | |
5b83683f | 796 | md = p; |
ab72a27d MF |
797 | |
798 | if (!should_map_region(md)) | |
799 | continue; | |
1c083eb2 | 800 | |
d2f7cbe7 | 801 | efi_map_region(md); |
481f75c0 DY |
802 | get_systab_virt_addr(md); |
803 | ||
884f4f66 | 804 | if (left < desc_size) { |
b7b898ae BP |
805 | new_memmap = realloc_pages(new_memmap, *pg_shift); |
806 | if (!new_memmap) | |
807 | return NULL; | |
808 | ||
809 | left += PAGE_SIZE << *pg_shift; | |
810 | (*pg_shift)++; | |
811 | } | |
812 | ||
884f4f66 | 813 | memcpy(new_memmap + (*count * desc_size), md, desc_size); |
b7b898ae | 814 | |
884f4f66 | 815 | left -= desc_size; |
481f75c0 DY |
816 | (*count)++; |
817 | } | |
d2f7cbe7 | 818 | |
481f75c0 | 819 | return new_memmap; |
481f75c0 DY |
820 | } |
821 | ||
fabb37c7 BP |
822 | static void __init kexec_enter_virtual_mode(void) |
823 | { | |
2965faa5 | 824 | #ifdef CONFIG_KEXEC_CORE |
fabb37c7 | 825 | efi_memory_desc_t *md; |
753b11ef | 826 | unsigned int num_pages; |
fabb37c7 BP |
827 | |
828 | efi.systab = NULL; | |
829 | ||
830 | /* | |
831 | * We don't do virtual mode, since we don't do runtime services, on | |
4e52797d SP |
832 | * non-native EFI. With efi=old_map, we don't do runtime services in |
833 | * kexec kernel because in the initial boot something else might | |
834 | * have been mapped at these virtual addresses. | |
fabb37c7 | 835 | */ |
4e52797d | 836 | if (!efi_is_native() || efi_enabled(EFI_OLD_MEMMAP)) { |
9479c7ce | 837 | efi_memmap_unmap(); |
a5a750a9 | 838 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 BP |
839 | return; |
840 | } | |
841 | ||
753b11ef MF |
842 | if (efi_alloc_page_tables()) { |
843 | pr_err("Failed to allocate EFI page tables\n"); | |
844 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
845 | return; | |
846 | } | |
847 | ||
fabb37c7 BP |
848 | /* |
849 | * Map efi regions which were passed via setup_data. The virt_addr is a | |
850 | * fixed addr which was used in first kernel of a kexec boot. | |
851 | */ | |
78ce248f | 852 | for_each_efi_memory_desc(md) { |
fabb37c7 BP |
853 | efi_map_region_fixed(md); /* FIXME: add error handling */ |
854 | get_systab_virt_addr(md); | |
855 | } | |
856 | ||
dca0f971 MF |
857 | /* |
858 | * Unregister the early EFI memmap from efi_init() and install | |
859 | * the new EFI memory map. | |
860 | */ | |
861 | efi_memmap_unmap(); | |
862 | ||
863 | if (efi_memmap_init_late(efi.memmap.phys_map, | |
864 | efi.memmap.desc_size * efi.memmap.nr_map)) { | |
865 | pr_err("Failed to remap late EFI memory map\n"); | |
866 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
867 | return; | |
868 | } | |
869 | ||
fabb37c7 BP |
870 | BUG_ON(!efi.systab); |
871 | ||
884f4f66 | 872 | num_pages = ALIGN(efi.memmap.nr_map * efi.memmap.desc_size, PAGE_SIZE); |
753b11ef MF |
873 | num_pages >>= PAGE_SHIFT; |
874 | ||
884f4f66 | 875 | if (efi_setup_page_tables(efi.memmap.phys_map, num_pages)) { |
753b11ef MF |
876 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
877 | return; | |
878 | } | |
879 | ||
fabb37c7 BP |
880 | efi_sync_low_kernel_mappings(); |
881 | ||
882 | /* | |
883 | * Now that EFI is in virtual mode, update the function | |
884 | * pointers in the runtime service table to the new virtual addresses. | |
885 | * | |
886 | * Call EFI services through wrapper functions. | |
887 | */ | |
888 | efi.runtime_version = efi_systab.hdr.revision; | |
994448f1 | 889 | |
022ee6c5 | 890 | efi_native_runtime_setup(); |
994448f1 | 891 | |
fabb37c7 | 892 | efi.set_virtual_address_map = NULL; |
fabb37c7 BP |
893 | |
894 | if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX)) | |
895 | runtime_code_page_mkexec(); | |
896 | ||
897 | /* clean DUMMY object */ | |
eeb9db09 | 898 | efi_delete_dummy_variable(); |
fabb37c7 BP |
899 | #endif |
900 | } | |
901 | ||
481f75c0 DY |
902 | /* |
903 | * This function will switch the EFI runtime services to virtual mode. | |
904 | * Essentially, we look through the EFI memmap and map every region that | |
905 | * has the runtime attribute bit set in its memory descriptor into the | |
67a9108e | 906 | * efi_pgd page table. |
481f75c0 DY |
907 | * |
908 | * The old method which used to update that memory descriptor with the | |
909 | * virtual address obtained from ioremap() is still supported when the | |
910 | * kernel is booted with efi=old_map on its command line. Same old | |
911 | * method enabled the runtime services to be called without having to | |
912 | * thunk back into physical mode for every invocation. | |
913 | * | |
914 | * The new method does a pagetable switch in a preemption-safe manner | |
915 | * so that we're in a different address space when calling a runtime | |
67a9108e MF |
916 | * function. For function arguments passing we do copy the PUDs of the |
917 | * kernel page table into efi_pgd prior to each call. | |
1fec0533 DY |
918 | * |
919 | * Specially for kexec boot, efi runtime maps in previous kernel should | |
920 | * be passed in via setup_data. In that case runtime ranges will be mapped | |
fabb37c7 BP |
921 | * to the same virtual addresses as the first kernel, see |
922 | * kexec_enter_virtual_mode(). | |
481f75c0 | 923 | */ |
fabb37c7 | 924 | static void __init __efi_enter_virtual_mode(void) |
481f75c0 | 925 | { |
fabb37c7 | 926 | int count = 0, pg_shift = 0; |
481f75c0 | 927 | void *new_memmap = NULL; |
b7b898ae | 928 | efi_status_t status; |
02e56902 | 929 | unsigned long pa; |
1c083eb2 | 930 | |
481f75c0 | 931 | efi.systab = NULL; |
d2f7cbe7 | 932 | |
67a9108e MF |
933 | if (efi_alloc_page_tables()) { |
934 | pr_err("Failed to allocate EFI page tables\n"); | |
935 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
936 | return; | |
937 | } | |
938 | ||
fabb37c7 BP |
939 | efi_merge_regions(); |
940 | new_memmap = efi_map_regions(&count, &pg_shift); | |
941 | if (!new_memmap) { | |
942 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); | |
a5a750a9 | 943 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 | 944 | return; |
b7b898ae | 945 | } |
926172d4 | 946 | |
dca0f971 MF |
947 | pa = __pa(new_memmap); |
948 | ||
949 | /* | |
950 | * Unregister the early EFI memmap from efi_init() and install | |
951 | * the new EFI memory map that we are about to pass to the | |
952 | * firmware via SetVirtualAddressMap(). | |
953 | */ | |
954 | efi_memmap_unmap(); | |
955 | ||
956 | if (efi_memmap_init_late(pa, efi.memmap.desc_size * count)) { | |
957 | pr_err("Failed to remap late EFI memory map\n"); | |
958 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
959 | return; | |
960 | } | |
961 | ||
22c091d0 DY |
962 | if (efi_enabled(EFI_DBG)) { |
963 | pr_info("EFI runtime memory map:\n"); | |
964 | efi_print_memmap(); | |
965 | } | |
966 | ||
5b83683f HY |
967 | BUG_ON(!efi.systab); |
968 | ||
dca0f971 | 969 | if (efi_setup_page_tables(pa, 1 << pg_shift)) { |
a5a750a9 | 970 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 | 971 | return; |
a5a750a9 | 972 | } |
b7b898ae | 973 | |
d2f7cbe7 BP |
974 | efi_sync_low_kernel_mappings(); |
975 | ||
994448f1 MF |
976 | if (efi_is_native()) { |
977 | status = phys_efi_set_virtual_address_map( | |
884f4f66 MF |
978 | efi.memmap.desc_size * count, |
979 | efi.memmap.desc_size, | |
980 | efi.memmap.desc_version, | |
dca0f971 | 981 | (efi_memory_desc_t *)pa); |
994448f1 MF |
982 | } else { |
983 | status = efi_thunk_set_virtual_address_map( | |
984 | efi_phys.set_virtual_address_map, | |
884f4f66 MF |
985 | efi.memmap.desc_size * count, |
986 | efi.memmap.desc_size, | |
987 | efi.memmap.desc_version, | |
dca0f971 | 988 | (efi_memory_desc_t *)pa); |
994448f1 | 989 | } |
1fec0533 | 990 | |
fabb37c7 BP |
991 | if (status != EFI_SUCCESS) { |
992 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", | |
993 | status); | |
994 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
5b83683f HY |
995 | } |
996 | ||
997 | /* | |
998 | * Now that EFI is in virtual mode, update the function | |
999 | * pointers in the runtime service table to the new virtual addresses. | |
1000 | * | |
1001 | * Call EFI services through wrapper functions. | |
1002 | */ | |
712ba9e9 | 1003 | efi.runtime_version = efi_systab.hdr.revision; |
4f9dbcfc MF |
1004 | |
1005 | if (efi_is_native()) | |
022ee6c5 | 1006 | efi_native_runtime_setup(); |
4f9dbcfc MF |
1007 | else |
1008 | efi_thunk_runtime_setup(); | |
1009 | ||
2b5e8ef3 | 1010 | efi.set_virtual_address_map = NULL; |
d2f7cbe7 | 1011 | |
6d0cc887 SP |
1012 | /* |
1013 | * Apply more restrictive page table mapping attributes now that | |
1014 | * SVAM() has been called and the firmware has performed all | |
1015 | * necessary relocation fixups for the new virtual addresses. | |
1016 | */ | |
1017 | efi_runtime_update_mappings(); | |
1adbfa35 | 1018 | |
f8b84043 | 1019 | /* clean DUMMY object */ |
eeb9db09 | 1020 | efi_delete_dummy_variable(); |
5b83683f HY |
1021 | } |
1022 | ||
fabb37c7 BP |
1023 | void __init efi_enter_virtual_mode(void) |
1024 | { | |
9f27bc54 DK |
1025 | if (efi_enabled(EFI_PARAVIRT)) |
1026 | return; | |
1027 | ||
fabb37c7 BP |
1028 | if (efi_setup) |
1029 | kexec_enter_virtual_mode(); | |
1030 | else | |
1031 | __efi_enter_virtual_mode(); | |
ac81d3de SP |
1032 | |
1033 | efi_dump_pagetable(); | |
fabb37c7 BP |
1034 | } |
1035 | ||
5ae3683c | 1036 | static int __init arch_parse_efi_cmdline(char *str) |
d2f7cbe7 | 1037 | { |
9115c758 RN |
1038 | if (!str) { |
1039 | pr_warn("need at least one option\n"); | |
1040 | return -EINVAL; | |
1041 | } | |
1042 | ||
6ccc72b8 DY |
1043 | if (parse_option_str(str, "old_map")) |
1044 | set_bit(EFI_OLD_MEMMAP, &efi.flags); | |
d2f7cbe7 BP |
1045 | |
1046 | return 0; | |
1047 | } | |
5ae3683c | 1048 | early_param("efi", arch_parse_efi_cmdline); |