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Commit | Line | Data |
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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 | ||
69c91893 PJ |
120 | /* |
121 | * Tell the kernel about the EFI memory map. This might include | |
122 | * more than the max 128 entries that can fit in the e820 legacy | |
123 | * (zeropage) memory map. | |
124 | */ | |
125 | ||
200001eb | 126 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
127 | { |
128 | void *p; | |
129 | ||
130 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
131 | efi_memory_desc_t *md = p; | |
132 | unsigned long long start = md->phys_addr; | |
133 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
134 | int e820_type; | |
135 | ||
e2a71476 CW |
136 | switch (md->type) { |
137 | case EFI_LOADER_CODE: | |
138 | case EFI_LOADER_DATA: | |
139 | case EFI_BOOT_SERVICES_CODE: | |
140 | case EFI_BOOT_SERVICES_DATA: | |
141 | case EFI_CONVENTIONAL_MEMORY: | |
142 | if (md->attribute & EFI_MEMORY_WB) | |
143 | e820_type = E820_RAM; | |
144 | else | |
145 | e820_type = E820_RESERVED; | |
146 | break; | |
147 | case EFI_ACPI_RECLAIM_MEMORY: | |
148 | e820_type = E820_ACPI; | |
149 | break; | |
150 | case EFI_ACPI_MEMORY_NVS: | |
151 | e820_type = E820_NVS; | |
152 | break; | |
153 | case EFI_UNUSABLE_MEMORY: | |
154 | e820_type = E820_UNUSABLE; | |
155 | break; | |
156 | default: | |
157 | /* | |
158 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
159 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
160 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
161 | */ | |
69c91893 | 162 | e820_type = E820_RESERVED; |
e2a71476 CW |
163 | break; |
164 | } | |
d0be6bde | 165 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
166 | } |
167 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
168 | } | |
169 | ||
1adbfa35 | 170 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 171 | { |
15b9c359 | 172 | struct efi_info *e = &boot_params.efi_info; |
ecacf09f HY |
173 | unsigned long pmap; |
174 | ||
9f27bc54 DK |
175 | if (efi_enabled(EFI_PARAVIRT)) |
176 | return 0; | |
177 | ||
05486fa7 | 178 | #ifdef CONFIG_X86_32 |
1adbfa35 | 179 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 180 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
181 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
182 | return -EINVAL; | |
183 | } | |
15b9c359 | 184 | pmap = e->efi_memmap; |
05486fa7 | 185 | #else |
15b9c359 | 186 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 187 | #endif |
15b9c359 BP |
188 | memmap.phys_map = (void *)pmap; |
189 | memmap.nr_map = e->efi_memmap_size / | |
190 | e->efi_memdesc_size; | |
191 | memmap.desc_size = e->efi_memdesc_size; | |
192 | memmap.desc_version = e->efi_memdesc_version; | |
193 | ||
24aa0788 | 194 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
1adbfa35 | 195 | |
258f6fd7 LL |
196 | efi.memmap = &memmap; |
197 | ||
1adbfa35 | 198 | return 0; |
ecacf09f HY |
199 | } |
200 | ||
5b83683f HY |
201 | static void __init print_efi_memmap(void) |
202 | { | |
f4fccac0 | 203 | #ifdef EFI_DEBUG |
5b83683f HY |
204 | efi_memory_desc_t *md; |
205 | void *p; | |
206 | int i; | |
207 | ||
208 | for (p = memmap.map, i = 0; | |
209 | p < memmap.map_end; | |
210 | p += memmap.desc_size, i++) { | |
ace1d121 LE |
211 | char buf[64]; |
212 | ||
5b83683f | 213 | md = p; |
ace1d121 LE |
214 | pr_info("mem%02u: %s range=[0x%016llx-0x%016llx) (%lluMB)\n", |
215 | i, efi_md_typeattr_format(buf, sizeof(buf), md), | |
216 | md->phys_addr, | |
5b83683f HY |
217 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), |
218 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
219 | } | |
5b83683f | 220 | #endif /* EFI_DEBUG */ |
f4fccac0 | 221 | } |
5b83683f | 222 | |
5189c2a7 | 223 | void __init efi_unmap_memmap(void) |
78510792 | 224 | { |
3e909599 | 225 | clear_bit(EFI_MEMMAP, &efi.flags); |
78510792 | 226 | if (memmap.map) { |
abc93f8e | 227 | early_memunmap(memmap.map, memmap.nr_map * memmap.desc_size); |
78510792 JT |
228 | memmap.map = NULL; |
229 | } | |
230 | } | |
231 | ||
140bf275 | 232 | static int __init efi_systab_init(void *phys) |
5b83683f | 233 | { |
83e68189 | 234 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 | 235 | efi_system_table_64_t *systab64; |
1fec0533 | 236 | struct efi_setup_data *data = NULL; |
1adbfa35 OJ |
237 | u64 tmp = 0; |
238 | ||
1fec0533 DY |
239 | if (efi_setup) { |
240 | data = early_memremap(efi_setup, sizeof(*data)); | |
241 | if (!data) | |
242 | return -ENOMEM; | |
243 | } | |
abc93f8e | 244 | systab64 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
245 | sizeof(*systab64)); |
246 | if (systab64 == NULL) { | |
247 | pr_err("Couldn't map the system table!\n"); | |
1fec0533 | 248 | if (data) |
abc93f8e | 249 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
250 | return -ENOMEM; |
251 | } | |
252 | ||
253 | efi_systab.hdr = systab64->hdr; | |
1fec0533 DY |
254 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
255 | systab64->fw_vendor; | |
256 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; | |
1adbfa35 OJ |
257 | efi_systab.fw_revision = systab64->fw_revision; |
258 | efi_systab.con_in_handle = systab64->con_in_handle; | |
259 | tmp |= systab64->con_in_handle; | |
260 | efi_systab.con_in = systab64->con_in; | |
261 | tmp |= systab64->con_in; | |
262 | efi_systab.con_out_handle = systab64->con_out_handle; | |
263 | tmp |= systab64->con_out_handle; | |
264 | efi_systab.con_out = systab64->con_out; | |
265 | tmp |= systab64->con_out; | |
266 | efi_systab.stderr_handle = systab64->stderr_handle; | |
267 | tmp |= systab64->stderr_handle; | |
268 | efi_systab.stderr = systab64->stderr; | |
269 | tmp |= systab64->stderr; | |
1fec0533 DY |
270 | efi_systab.runtime = data ? |
271 | (void *)(unsigned long)data->runtime : | |
272 | (void *)(unsigned long)systab64->runtime; | |
273 | tmp |= data ? data->runtime : systab64->runtime; | |
1adbfa35 OJ |
274 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
275 | tmp |= systab64->boottime; | |
276 | efi_systab.nr_tables = systab64->nr_tables; | |
1fec0533 DY |
277 | efi_systab.tables = data ? (unsigned long)data->tables : |
278 | systab64->tables; | |
279 | tmp |= data ? data->tables : systab64->tables; | |
1adbfa35 | 280 | |
abc93f8e | 281 | early_memunmap(systab64, sizeof(*systab64)); |
1fec0533 | 282 | if (data) |
abc93f8e | 283 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
284 | #ifdef CONFIG_X86_32 |
285 | if (tmp >> 32) { | |
286 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
287 | return -EINVAL; | |
288 | } | |
289 | #endif | |
290 | } else { | |
291 | efi_system_table_32_t *systab32; | |
292 | ||
abc93f8e | 293 | systab32 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
294 | sizeof(*systab32)); |
295 | if (systab32 == NULL) { | |
296 | pr_err("Couldn't map the system table!\n"); | |
297 | return -ENOMEM; | |
298 | } | |
299 | ||
300 | efi_systab.hdr = systab32->hdr; | |
301 | efi_systab.fw_vendor = systab32->fw_vendor; | |
302 | efi_systab.fw_revision = systab32->fw_revision; | |
303 | efi_systab.con_in_handle = systab32->con_in_handle; | |
304 | efi_systab.con_in = systab32->con_in; | |
305 | efi_systab.con_out_handle = systab32->con_out_handle; | |
306 | efi_systab.con_out = systab32->con_out; | |
307 | efi_systab.stderr_handle = systab32->stderr_handle; | |
308 | efi_systab.stderr = systab32->stderr; | |
309 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
310 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
311 | efi_systab.nr_tables = systab32->nr_tables; | |
312 | efi_systab.tables = systab32->tables; | |
313 | ||
abc93f8e | 314 | early_memunmap(systab32, sizeof(*systab32)); |
140bf275 | 315 | } |
1adbfa35 | 316 | |
5b83683f HY |
317 | efi.systab = &efi_systab; |
318 | ||
319 | /* | |
320 | * Verify the EFI Table | |
321 | */ | |
140bf275 | 322 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 323 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
324 | return -EINVAL; |
325 | } | |
5b83683f | 326 | if ((efi.systab->hdr.revision >> 16) == 0) |
9b7d2049 | 327 | pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n", |
5b83683f HY |
328 | efi.systab->hdr.revision >> 16, |
329 | efi.systab->hdr.revision & 0xffff); | |
140bf275 | 330 | |
0f8093a9 MF |
331 | set_bit(EFI_SYSTEM_TABLES, &efi.flags); |
332 | ||
140bf275 | 333 | return 0; |
83e7ee66 | 334 | } |
5b83683f | 335 | |
4f9dbcfc | 336 | static int __init efi_runtime_init32(void) |
83e7ee66 | 337 | { |
4f9dbcfc MF |
338 | efi_runtime_services_32_t *runtime; |
339 | ||
abc93f8e | 340 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc MF |
341 | sizeof(efi_runtime_services_32_t)); |
342 | if (!runtime) { | |
343 | pr_err("Could not map the runtime service table!\n"); | |
344 | return -ENOMEM; | |
345 | } | |
5b83683f HY |
346 | |
347 | /* | |
0ce4605c MK |
348 | * We will only need *early* access to the SetVirtualAddressMap |
349 | * EFI runtime service. All other runtime services will be called | |
350 | * via the virtual mapping. | |
5b83683f | 351 | */ |
4f9dbcfc MF |
352 | efi_phys.set_virtual_address_map = |
353 | (efi_set_virtual_address_map_t *) | |
354 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 355 | early_memunmap(runtime, sizeof(efi_runtime_services_32_t)); |
4f9dbcfc MF |
356 | |
357 | return 0; | |
358 | } | |
359 | ||
360 | static int __init efi_runtime_init64(void) | |
361 | { | |
362 | efi_runtime_services_64_t *runtime; | |
363 | ||
abc93f8e | 364 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc | 365 | sizeof(efi_runtime_services_64_t)); |
140bf275 | 366 | if (!runtime) { |
e3cb3f5a | 367 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
368 | return -ENOMEM; |
369 | } | |
4f9dbcfc | 370 | |
140bf275 | 371 | /* |
0ce4605c MK |
372 | * We will only need *early* access to the SetVirtualAddressMap |
373 | * EFI runtime service. All other runtime services will be called | |
374 | * via the virtual mapping. | |
140bf275 | 375 | */ |
140bf275 | 376 | efi_phys.set_virtual_address_map = |
4f9dbcfc MF |
377 | (efi_set_virtual_address_map_t *) |
378 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 379 | early_memunmap(runtime, sizeof(efi_runtime_services_64_t)); |
4f9dbcfc MF |
380 | |
381 | return 0; | |
382 | } | |
383 | ||
384 | static int __init efi_runtime_init(void) | |
385 | { | |
386 | int rv; | |
387 | ||
388 | /* | |
389 | * Check out the runtime services table. We need to map | |
390 | * the runtime services table so that we can grab the physical | |
391 | * address of several of the EFI runtime functions, needed to | |
392 | * set the firmware into virtual mode. | |
9f27bc54 DK |
393 | * |
394 | * When EFI_PARAVIRT is in force then we could not map runtime | |
395 | * service memory region because we do not have direct access to it. | |
396 | * However, runtime services are available through proxy functions | |
397 | * (e.g. in case of Xen dom0 EFI implementation they call special | |
398 | * hypercall which executes relevant EFI functions) and that is why | |
399 | * they are always enabled. | |
4f9dbcfc | 400 | */ |
4f9dbcfc | 401 | |
9f27bc54 DK |
402 | if (!efi_enabled(EFI_PARAVIRT)) { |
403 | if (efi_enabled(EFI_64BIT)) | |
404 | rv = efi_runtime_init64(); | |
405 | else | |
406 | rv = efi_runtime_init32(); | |
407 | ||
408 | if (rv) | |
409 | return rv; | |
410 | } | |
140bf275 | 411 | |
0f8093a9 MF |
412 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
413 | ||
140bf275 | 414 | return 0; |
83e7ee66 | 415 | } |
5b83683f | 416 | |
140bf275 | 417 | static int __init efi_memmap_init(void) |
83e7ee66 | 418 | { |
9f27bc54 DK |
419 | if (efi_enabled(EFI_PARAVIRT)) |
420 | return 0; | |
421 | ||
5b83683f | 422 | /* Map the EFI memory map */ |
abc93f8e | 423 | memmap.map = early_memremap((unsigned long)memmap.phys_map, |
beacfaac | 424 | memmap.nr_map * memmap.desc_size); |
140bf275 | 425 | if (memmap.map == NULL) { |
e3cb3f5a | 426 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
427 | return -ENOMEM; |
428 | } | |
5b83683f | 429 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 430 | |
200001eb PJ |
431 | if (add_efi_memmap) |
432 | do_add_efi_memmap(); | |
140bf275 | 433 | |
0f8093a9 MF |
434 | set_bit(EFI_MEMMAP, &efi.flags); |
435 | ||
140bf275 | 436 | return 0; |
83e7ee66 OJ |
437 | } |
438 | ||
439 | void __init efi_init(void) | |
440 | { | |
441 | efi_char16_t *c16; | |
442 | char vendor[100] = "unknown"; | |
443 | int i = 0; | |
444 | void *tmp; | |
445 | ||
446 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
447 | if (boot_params.efi_info.efi_systab_hi || |
448 | boot_params.efi_info.efi_memmap_hi) { | |
449 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
450 | return; |
451 | } | |
83e7ee66 OJ |
452 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
453 | #else | |
454 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
455 | (boot_params.efi_info.efi_systab | |
456 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
457 | #endif |
458 | ||
83e68189 | 459 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 460 | return; |
83e68189 | 461 | |
a0998eb1 DY |
462 | efi.config_table = (unsigned long)efi.systab->tables; |
463 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; | |
464 | efi.runtime = (unsigned long)efi.systab->runtime; | |
465 | ||
83e7ee66 OJ |
466 | /* |
467 | * Show what we know for posterity | |
468 | */ | |
abc93f8e | 469 | c16 = tmp = early_memremap(efi.systab->fw_vendor, 2); |
83e7ee66 OJ |
470 | if (c16) { |
471 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
472 | vendor[i] = *c16++; | |
473 | vendor[i] = '\0'; | |
474 | } else | |
e3cb3f5a | 475 | pr_err("Could not map the firmware vendor!\n"); |
abc93f8e | 476 | early_memunmap(tmp, 2); |
83e7ee66 | 477 | |
e3cb3f5a OJ |
478 | pr_info("EFI v%u.%.02u by %s\n", |
479 | efi.systab->hdr.revision >> 16, | |
480 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 481 | |
1fec0533 DY |
482 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
483 | return; | |
484 | ||
272686bf | 485 | if (efi_config_init(arch_tables)) |
140bf275 | 486 | return; |
83e68189 | 487 | |
1adbfa35 OJ |
488 | /* |
489 | * Note: We currently don't support runtime services on an EFI | |
490 | * that doesn't match the kernel 32/64-bit mode. | |
491 | */ | |
492 | ||
7d453eee | 493 | if (!efi_runtime_supported()) |
1adbfa35 | 494 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 495 | else { |
b2e0a54a | 496 | if (efi_runtime_disabled() || efi_runtime_init()) |
83e68189 | 497 | return; |
140bf275 | 498 | } |
83e68189 | 499 | if (efi_memmap_init()) |
140bf275 | 500 | return; |
83e68189 | 501 | |
fed6cefe BP |
502 | if (efi_enabled(EFI_DBG)) |
503 | print_efi_memmap(); | |
5b83683f HY |
504 | } |
505 | ||
2223af38 JT |
506 | void __init efi_late_init(void) |
507 | { | |
508 | efi_bgrt_init(); | |
509 | } | |
510 | ||
9cd2b07c MG |
511 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
512 | { | |
513 | u64 addr, npages; | |
514 | ||
515 | addr = md->virt_addr; | |
516 | npages = md->num_pages; | |
517 | ||
518 | memrange_efi_to_native(&addr, &npages); | |
519 | ||
520 | if (executable) | |
521 | set_memory_x(addr, npages); | |
522 | else | |
523 | set_memory_nx(addr, npages); | |
524 | } | |
525 | ||
c55d016f | 526 | void __init runtime_code_page_mkexec(void) |
a2172e25 HY |
527 | { |
528 | efi_memory_desc_t *md; | |
a2172e25 HY |
529 | void *p; |
530 | ||
a2172e25 HY |
531 | /* Make EFI runtime service code area executable */ |
532 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
533 | md = p; | |
1c083eb2 HY |
534 | |
535 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
536 | continue; | |
537 | ||
9cd2b07c | 538 | efi_set_executable(md, true); |
a2172e25 | 539 | } |
a2172e25 | 540 | } |
a2172e25 | 541 | |
4e78eb05 | 542 | void __init efi_memory_uc(u64 addr, unsigned long size) |
3e8fa263 MF |
543 | { |
544 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
545 | u64 npages; | |
546 | ||
547 | npages = round_up(size, page_shift) / page_shift; | |
548 | memrange_efi_to_native(&addr, &npages); | |
549 | set_memory_uc(addr, npages); | |
550 | } | |
551 | ||
d2f7cbe7 BP |
552 | void __init old_map_region(efi_memory_desc_t *md) |
553 | { | |
554 | u64 start_pfn, end_pfn, end; | |
555 | unsigned long size; | |
556 | void *va; | |
557 | ||
558 | start_pfn = PFN_DOWN(md->phys_addr); | |
559 | size = md->num_pages << PAGE_SHIFT; | |
560 | end = md->phys_addr + size; | |
561 | end_pfn = PFN_UP(end); | |
562 | ||
563 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { | |
564 | va = __va(md->phys_addr); | |
565 | ||
566 | if (!(md->attribute & EFI_MEMORY_WB)) | |
567 | efi_memory_uc((u64)(unsigned long)va, size); | |
568 | } else | |
569 | va = efi_ioremap(md->phys_addr, size, | |
570 | md->type, md->attribute); | |
571 | ||
572 | md->virt_addr = (u64) (unsigned long) va; | |
573 | if (!va) | |
574 | pr_err("ioremap of 0x%llX failed!\n", | |
575 | (unsigned long long)md->phys_addr); | |
576 | } | |
577 | ||
481f75c0 DY |
578 | /* Merge contiguous regions of the same type and attribute */ |
579 | static void __init efi_merge_regions(void) | |
5b83683f | 580 | { |
481f75c0 | 581 | void *p; |
202f9d0a | 582 | efi_memory_desc_t *md, *prev_md = NULL; |
202f9d0a | 583 | |
202f9d0a MG |
584 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
585 | u64 prev_size; | |
586 | md = p; | |
587 | ||
588 | if (!prev_md) { | |
589 | prev_md = md; | |
590 | continue; | |
591 | } | |
592 | ||
593 | if (prev_md->type != md->type || | |
594 | prev_md->attribute != md->attribute) { | |
595 | prev_md = md; | |
596 | continue; | |
597 | } | |
598 | ||
599 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
600 | ||
601 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
602 | prev_md->num_pages += md->num_pages; | |
603 | md->type = EFI_RESERVED_TYPE; | |
604 | md->attribute = 0; | |
605 | continue; | |
606 | } | |
607 | prev_md = md; | |
481f75c0 DY |
608 | } |
609 | } | |
610 | ||
611 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) | |
612 | { | |
613 | unsigned long size; | |
614 | u64 end, systab; | |
d2f7cbe7 | 615 | |
481f75c0 DY |
616 | size = md->num_pages << EFI_PAGE_SHIFT; |
617 | end = md->phys_addr + size; | |
618 | systab = (u64)(unsigned long)efi_phys.systab; | |
619 | if (md->phys_addr <= systab && systab < end) { | |
620 | systab += md->virt_addr - md->phys_addr; | |
621 | efi.systab = (efi_system_table_t *)(unsigned long)systab; | |
202f9d0a | 622 | } |
481f75c0 DY |
623 | } |
624 | ||
fabb37c7 | 625 | static void __init save_runtime_map(void) |
926172d4 | 626 | { |
fabb37c7 | 627 | #ifdef CONFIG_KEXEC |
926172d4 DY |
628 | efi_memory_desc_t *md; |
629 | void *tmp, *p, *q = NULL; | |
630 | int count = 0; | |
631 | ||
a3530e8f DY |
632 | if (efi_enabled(EFI_OLD_MEMMAP)) |
633 | return; | |
634 | ||
926172d4 DY |
635 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
636 | md = p; | |
637 | ||
638 | if (!(md->attribute & EFI_MEMORY_RUNTIME) || | |
639 | (md->type == EFI_BOOT_SERVICES_CODE) || | |
640 | (md->type == EFI_BOOT_SERVICES_DATA)) | |
641 | continue; | |
642 | tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL); | |
643 | if (!tmp) | |
644 | goto out; | |
645 | q = tmp; | |
646 | ||
647 | memcpy(q + count * memmap.desc_size, md, memmap.desc_size); | |
648 | count++; | |
649 | } | |
650 | ||
518548ab | 651 | efi_runtime_map_setup(q, count, memmap.desc_size); |
fabb37c7 | 652 | return; |
926172d4 | 653 | |
926172d4 DY |
654 | out: |
655 | kfree(q); | |
fabb37c7 BP |
656 | pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n"); |
657 | #endif | |
1fec0533 DY |
658 | } |
659 | ||
b7b898ae BP |
660 | static void *realloc_pages(void *old_memmap, int old_shift) |
661 | { | |
662 | void *ret; | |
663 | ||
664 | ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1); | |
665 | if (!ret) | |
666 | goto out; | |
667 | ||
668 | /* | |
669 | * A first-time allocation doesn't have anything to copy. | |
670 | */ | |
671 | if (!old_memmap) | |
672 | return ret; | |
673 | ||
674 | memcpy(ret, old_memmap, PAGE_SIZE << old_shift); | |
675 | ||
676 | out: | |
677 | free_pages((unsigned long)old_memmap, old_shift); | |
678 | return ret; | |
679 | } | |
680 | ||
481f75c0 | 681 | /* |
b7b898ae BP |
682 | * Map the efi memory ranges of the runtime services and update new_mmap with |
683 | * virtual addresses. | |
481f75c0 | 684 | */ |
b7b898ae | 685 | static void * __init efi_map_regions(int *count, int *pg_shift) |
481f75c0 | 686 | { |
b7b898ae BP |
687 | void *p, *new_memmap = NULL; |
688 | unsigned long left = 0; | |
481f75c0 | 689 | efi_memory_desc_t *md; |
202f9d0a | 690 | |
5b83683f HY |
691 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
692 | md = p; | |
70087011 JB |
693 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) { |
694 | #ifdef CONFIG_X86_64 | |
695 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
696 | md->type != EFI_BOOT_SERVICES_DATA) | |
697 | #endif | |
698 | continue; | |
699 | } | |
1c083eb2 | 700 | |
d2f7cbe7 | 701 | efi_map_region(md); |
481f75c0 DY |
702 | get_systab_virt_addr(md); |
703 | ||
b7b898ae BP |
704 | if (left < memmap.desc_size) { |
705 | new_memmap = realloc_pages(new_memmap, *pg_shift); | |
706 | if (!new_memmap) | |
707 | return NULL; | |
708 | ||
709 | left += PAGE_SIZE << *pg_shift; | |
710 | (*pg_shift)++; | |
711 | } | |
712 | ||
481f75c0 DY |
713 | memcpy(new_memmap + (*count * memmap.desc_size), md, |
714 | memmap.desc_size); | |
b7b898ae BP |
715 | |
716 | left -= memmap.desc_size; | |
481f75c0 DY |
717 | (*count)++; |
718 | } | |
d2f7cbe7 | 719 | |
481f75c0 | 720 | return new_memmap; |
481f75c0 DY |
721 | } |
722 | ||
fabb37c7 BP |
723 | static void __init kexec_enter_virtual_mode(void) |
724 | { | |
725 | #ifdef CONFIG_KEXEC | |
726 | efi_memory_desc_t *md; | |
727 | void *p; | |
728 | ||
729 | efi.systab = NULL; | |
730 | ||
731 | /* | |
732 | * We don't do virtual mode, since we don't do runtime services, on | |
733 | * non-native EFI | |
734 | */ | |
735 | if (!efi_is_native()) { | |
736 | efi_unmap_memmap(); | |
a5a750a9 | 737 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 BP |
738 | return; |
739 | } | |
740 | ||
741 | /* | |
742 | * Map efi regions which were passed via setup_data. The virt_addr is a | |
743 | * fixed addr which was used in first kernel of a kexec boot. | |
744 | */ | |
745 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
746 | md = p; | |
747 | efi_map_region_fixed(md); /* FIXME: add error handling */ | |
748 | get_systab_virt_addr(md); | |
749 | } | |
750 | ||
751 | save_runtime_map(); | |
752 | ||
753 | BUG_ON(!efi.systab); | |
754 | ||
755 | efi_sync_low_kernel_mappings(); | |
756 | ||
757 | /* | |
758 | * Now that EFI is in virtual mode, update the function | |
759 | * pointers in the runtime service table to the new virtual addresses. | |
760 | * | |
761 | * Call EFI services through wrapper functions. | |
762 | */ | |
763 | efi.runtime_version = efi_systab.hdr.revision; | |
994448f1 | 764 | |
022ee6c5 | 765 | efi_native_runtime_setup(); |
994448f1 | 766 | |
fabb37c7 | 767 | efi.set_virtual_address_map = NULL; |
fabb37c7 BP |
768 | |
769 | if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX)) | |
770 | runtime_code_page_mkexec(); | |
771 | ||
772 | /* clean DUMMY object */ | |
eeb9db09 | 773 | efi_delete_dummy_variable(); |
fabb37c7 BP |
774 | #endif |
775 | } | |
776 | ||
481f75c0 DY |
777 | /* |
778 | * This function will switch the EFI runtime services to virtual mode. | |
779 | * Essentially, we look through the EFI memmap and map every region that | |
780 | * has the runtime attribute bit set in its memory descriptor into the | |
781 | * ->trampoline_pgd page table using a top-down VA allocation scheme. | |
782 | * | |
783 | * The old method which used to update that memory descriptor with the | |
784 | * virtual address obtained from ioremap() is still supported when the | |
785 | * kernel is booted with efi=old_map on its command line. Same old | |
786 | * method enabled the runtime services to be called without having to | |
787 | * thunk back into physical mode for every invocation. | |
788 | * | |
789 | * The new method does a pagetable switch in a preemption-safe manner | |
790 | * so that we're in a different address space when calling a runtime | |
791 | * function. For function arguments passing we do copy the PGDs of the | |
792 | * kernel page table into ->trampoline_pgd prior to each call. | |
1fec0533 DY |
793 | * |
794 | * Specially for kexec boot, efi runtime maps in previous kernel should | |
795 | * be passed in via setup_data. In that case runtime ranges will be mapped | |
fabb37c7 BP |
796 | * to the same virtual addresses as the first kernel, see |
797 | * kexec_enter_virtual_mode(). | |
481f75c0 | 798 | */ |
fabb37c7 | 799 | static void __init __efi_enter_virtual_mode(void) |
481f75c0 | 800 | { |
fabb37c7 | 801 | int count = 0, pg_shift = 0; |
481f75c0 | 802 | void *new_memmap = NULL; |
b7b898ae | 803 | efi_status_t status; |
1c083eb2 | 804 | |
481f75c0 | 805 | efi.systab = NULL; |
d2f7cbe7 | 806 | |
fabb37c7 BP |
807 | efi_merge_regions(); |
808 | new_memmap = efi_map_regions(&count, &pg_shift); | |
809 | if (!new_memmap) { | |
810 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); | |
a5a750a9 | 811 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 | 812 | return; |
b7b898ae | 813 | } |
926172d4 | 814 | |
fabb37c7 BP |
815 | save_runtime_map(); |
816 | ||
5b83683f HY |
817 | BUG_ON(!efi.systab); |
818 | ||
a5a750a9 DY |
819 | if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) { |
820 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
fabb37c7 | 821 | return; |
a5a750a9 | 822 | } |
b7b898ae | 823 | |
d2f7cbe7 | 824 | efi_sync_low_kernel_mappings(); |
11cc8512 | 825 | efi_dump_pagetable(); |
d2f7cbe7 | 826 | |
994448f1 MF |
827 | if (efi_is_native()) { |
828 | status = phys_efi_set_virtual_address_map( | |
829 | memmap.desc_size * count, | |
830 | memmap.desc_size, | |
831 | memmap.desc_version, | |
832 | (efi_memory_desc_t *)__pa(new_memmap)); | |
833 | } else { | |
834 | status = efi_thunk_set_virtual_address_map( | |
835 | efi_phys.set_virtual_address_map, | |
836 | memmap.desc_size * count, | |
837 | memmap.desc_size, | |
838 | memmap.desc_version, | |
839 | (efi_memory_desc_t *)__pa(new_memmap)); | |
840 | } | |
1fec0533 | 841 | |
fabb37c7 BP |
842 | if (status != EFI_SUCCESS) { |
843 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", | |
844 | status); | |
845 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
5b83683f HY |
846 | } |
847 | ||
848 | /* | |
849 | * Now that EFI is in virtual mode, update the function | |
850 | * pointers in the runtime service table to the new virtual addresses. | |
851 | * | |
852 | * Call EFI services through wrapper functions. | |
853 | */ | |
712ba9e9 | 854 | efi.runtime_version = efi_systab.hdr.revision; |
4f9dbcfc MF |
855 | |
856 | if (efi_is_native()) | |
022ee6c5 | 857 | efi_native_runtime_setup(); |
4f9dbcfc MF |
858 | else |
859 | efi_thunk_runtime_setup(); | |
860 | ||
2b5e8ef3 | 861 | efi.set_virtual_address_map = NULL; |
d2f7cbe7 | 862 | |
c55d016f | 863 | efi_runtime_mkexec(); |
1adbfa35 | 864 | |
b7b898ae BP |
865 | /* |
866 | * We mapped the descriptor array into the EFI pagetable above but we're | |
867 | * not unmapping it here. Here's why: | |
868 | * | |
869 | * We're copying select PGDs from the kernel page table to the EFI page | |
870 | * table and when we do so and make changes to those PGDs like unmapping | |
871 | * stuff from them, those changes appear in the kernel page table and we | |
872 | * go boom. | |
873 | * | |
874 | * From setup_real_mode(): | |
875 | * | |
876 | * ... | |
877 | * trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd; | |
878 | * | |
879 | * In this particular case, our allocation is in PGD 0 of the EFI page | |
880 | * table but we've copied that PGD from PGD[272] of the EFI page table: | |
881 | * | |
882 | * pgd_index(__PAGE_OFFSET = 0xffff880000000000) = 272 | |
883 | * | |
884 | * where the direct memory mapping in kernel space is. | |
885 | * | |
886 | * new_memmap's VA comes from that direct mapping and thus clearing it, | |
887 | * it would get cleared in the kernel page table too. | |
888 | * | |
889 | * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift); | |
890 | */ | |
fabb37c7 | 891 | free_pages((unsigned long)new_memmap, pg_shift); |
f8b84043 MG |
892 | |
893 | /* clean DUMMY object */ | |
eeb9db09 | 894 | efi_delete_dummy_variable(); |
5b83683f HY |
895 | } |
896 | ||
fabb37c7 BP |
897 | void __init efi_enter_virtual_mode(void) |
898 | { | |
9f27bc54 DK |
899 | if (efi_enabled(EFI_PARAVIRT)) |
900 | return; | |
901 | ||
fabb37c7 BP |
902 | if (efi_setup) |
903 | kexec_enter_virtual_mode(); | |
904 | else | |
905 | __efi_enter_virtual_mode(); | |
906 | } | |
907 | ||
5b83683f HY |
908 | /* |
909 | * Convenience functions to obtain memory types and attributes | |
910 | */ | |
911 | u32 efi_mem_type(unsigned long phys_addr) | |
912 | { | |
913 | efi_memory_desc_t *md; | |
914 | void *p; | |
915 | ||
83e68189 MF |
916 | if (!efi_enabled(EFI_MEMMAP)) |
917 | return 0; | |
918 | ||
5b83683f HY |
919 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
920 | md = p; | |
921 | if ((md->phys_addr <= phys_addr) && | |
922 | (phys_addr < (md->phys_addr + | |
923 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
924 | return md->type; | |
925 | } | |
926 | return 0; | |
927 | } | |
928 | ||
929 | u64 efi_mem_attributes(unsigned long phys_addr) | |
930 | { | |
931 | efi_memory_desc_t *md; | |
932 | void *p; | |
933 | ||
67a9b9c5 DK |
934 | if (!efi_enabled(EFI_MEMMAP)) |
935 | return 0; | |
936 | ||
5b83683f HY |
937 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
938 | md = p; | |
939 | if ((md->phys_addr <= phys_addr) && | |
940 | (phys_addr < (md->phys_addr + | |
941 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
942 | return md->attribute; | |
943 | } | |
944 | return 0; | |
945 | } | |
a6e4d5a0 | 946 | |
5ae3683c | 947 | static int __init arch_parse_efi_cmdline(char *str) |
d2f7cbe7 | 948 | { |
6ccc72b8 DY |
949 | if (parse_option_str(str, "old_map")) |
950 | set_bit(EFI_OLD_MEMMAP, &efi.flags); | |
fed6cefe BP |
951 | if (parse_option_str(str, "debug")) |
952 | set_bit(EFI_DBG, &efi.flags); | |
d2f7cbe7 BP |
953 | |
954 | return 0; | |
955 | } | |
5ae3683c | 956 | early_param("efi", arch_parse_efi_cmdline); |