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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; | |
88 | ||
4e78eb05 | 89 | efi_call_phys_prolog(); |
62fa6e69 MF |
90 | status = efi_call_phys(efi_phys.set_virtual_address_map, |
91 | memory_map_size, descriptor_size, | |
92 | descriptor_version, virtual_map); | |
5b83683f HY |
93 | efi_call_phys_epilog(); |
94 | return status; | |
95 | } | |
96 | ||
3565184e | 97 | void efi_get_time(struct timespec *now) |
5b83683f HY |
98 | { |
99 | efi_status_t status; | |
100 | efi_time_t eft; | |
101 | efi_time_cap_t cap; | |
102 | ||
103 | status = efi.get_time(&eft, &cap); | |
104 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 105 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f | 106 | |
3565184e DV |
107 | now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour, |
108 | eft.minute, eft.second); | |
109 | now->tv_nsec = 0; | |
5b83683f HY |
110 | } |
111 | ||
69c91893 PJ |
112 | /* |
113 | * Tell the kernel about the EFI memory map. This might include | |
114 | * more than the max 128 entries that can fit in the e820 legacy | |
115 | * (zeropage) memory map. | |
116 | */ | |
117 | ||
200001eb | 118 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
119 | { |
120 | void *p; | |
121 | ||
122 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
123 | efi_memory_desc_t *md = p; | |
124 | unsigned long long start = md->phys_addr; | |
125 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
126 | int e820_type; | |
127 | ||
e2a71476 CW |
128 | switch (md->type) { |
129 | case EFI_LOADER_CODE: | |
130 | case EFI_LOADER_DATA: | |
131 | case EFI_BOOT_SERVICES_CODE: | |
132 | case EFI_BOOT_SERVICES_DATA: | |
133 | case EFI_CONVENTIONAL_MEMORY: | |
134 | if (md->attribute & EFI_MEMORY_WB) | |
135 | e820_type = E820_RAM; | |
136 | else | |
137 | e820_type = E820_RESERVED; | |
138 | break; | |
139 | case EFI_ACPI_RECLAIM_MEMORY: | |
140 | e820_type = E820_ACPI; | |
141 | break; | |
142 | case EFI_ACPI_MEMORY_NVS: | |
143 | e820_type = E820_NVS; | |
144 | break; | |
145 | case EFI_UNUSABLE_MEMORY: | |
146 | e820_type = E820_UNUSABLE; | |
147 | break; | |
148 | default: | |
149 | /* | |
150 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
151 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
152 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
153 | */ | |
69c91893 | 154 | e820_type = E820_RESERVED; |
e2a71476 CW |
155 | break; |
156 | } | |
d0be6bde | 157 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
158 | } |
159 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
160 | } | |
161 | ||
1adbfa35 | 162 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 163 | { |
15b9c359 | 164 | struct efi_info *e = &boot_params.efi_info; |
ecacf09f HY |
165 | unsigned long pmap; |
166 | ||
9f27bc54 DK |
167 | if (efi_enabled(EFI_PARAVIRT)) |
168 | return 0; | |
169 | ||
05486fa7 | 170 | #ifdef CONFIG_X86_32 |
1adbfa35 | 171 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 172 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
173 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
174 | return -EINVAL; | |
175 | } | |
15b9c359 | 176 | pmap = e->efi_memmap; |
05486fa7 | 177 | #else |
15b9c359 | 178 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 179 | #endif |
15b9c359 BP |
180 | memmap.phys_map = (void *)pmap; |
181 | memmap.nr_map = e->efi_memmap_size / | |
182 | e->efi_memdesc_size; | |
183 | memmap.desc_size = e->efi_memdesc_size; | |
184 | memmap.desc_version = e->efi_memdesc_version; | |
185 | ||
24aa0788 | 186 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
1adbfa35 | 187 | |
258f6fd7 LL |
188 | efi.memmap = &memmap; |
189 | ||
1adbfa35 | 190 | return 0; |
ecacf09f HY |
191 | } |
192 | ||
5b83683f HY |
193 | static void __init print_efi_memmap(void) |
194 | { | |
f4fccac0 | 195 | #ifdef EFI_DEBUG |
5b83683f HY |
196 | efi_memory_desc_t *md; |
197 | void *p; | |
198 | int i; | |
199 | ||
200 | for (p = memmap.map, i = 0; | |
201 | p < memmap.map_end; | |
202 | p += memmap.desc_size, i++) { | |
ace1d121 LE |
203 | char buf[64]; |
204 | ||
5b83683f | 205 | md = p; |
ace1d121 LE |
206 | pr_info("mem%02u: %s range=[0x%016llx-0x%016llx) (%lluMB)\n", |
207 | i, efi_md_typeattr_format(buf, sizeof(buf), md), | |
208 | md->phys_addr, | |
5b83683f HY |
209 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), |
210 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
211 | } | |
5b83683f | 212 | #endif /* EFI_DEBUG */ |
f4fccac0 | 213 | } |
5b83683f | 214 | |
5189c2a7 | 215 | void __init efi_unmap_memmap(void) |
78510792 | 216 | { |
3e909599 | 217 | clear_bit(EFI_MEMMAP, &efi.flags); |
78510792 | 218 | if (memmap.map) { |
abc93f8e | 219 | early_memunmap(memmap.map, memmap.nr_map * memmap.desc_size); |
78510792 JT |
220 | memmap.map = NULL; |
221 | } | |
222 | } | |
223 | ||
140bf275 | 224 | static int __init efi_systab_init(void *phys) |
5b83683f | 225 | { |
83e68189 | 226 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 | 227 | efi_system_table_64_t *systab64; |
1fec0533 | 228 | struct efi_setup_data *data = NULL; |
1adbfa35 OJ |
229 | u64 tmp = 0; |
230 | ||
1fec0533 DY |
231 | if (efi_setup) { |
232 | data = early_memremap(efi_setup, sizeof(*data)); | |
233 | if (!data) | |
234 | return -ENOMEM; | |
235 | } | |
abc93f8e | 236 | systab64 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
237 | sizeof(*systab64)); |
238 | if (systab64 == NULL) { | |
239 | pr_err("Couldn't map the system table!\n"); | |
1fec0533 | 240 | if (data) |
abc93f8e | 241 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
242 | return -ENOMEM; |
243 | } | |
244 | ||
245 | efi_systab.hdr = systab64->hdr; | |
1fec0533 DY |
246 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
247 | systab64->fw_vendor; | |
248 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; | |
1adbfa35 OJ |
249 | efi_systab.fw_revision = systab64->fw_revision; |
250 | efi_systab.con_in_handle = systab64->con_in_handle; | |
251 | tmp |= systab64->con_in_handle; | |
252 | efi_systab.con_in = systab64->con_in; | |
253 | tmp |= systab64->con_in; | |
254 | efi_systab.con_out_handle = systab64->con_out_handle; | |
255 | tmp |= systab64->con_out_handle; | |
256 | efi_systab.con_out = systab64->con_out; | |
257 | tmp |= systab64->con_out; | |
258 | efi_systab.stderr_handle = systab64->stderr_handle; | |
259 | tmp |= systab64->stderr_handle; | |
260 | efi_systab.stderr = systab64->stderr; | |
261 | tmp |= systab64->stderr; | |
1fec0533 DY |
262 | efi_systab.runtime = data ? |
263 | (void *)(unsigned long)data->runtime : | |
264 | (void *)(unsigned long)systab64->runtime; | |
265 | tmp |= data ? data->runtime : systab64->runtime; | |
1adbfa35 OJ |
266 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
267 | tmp |= systab64->boottime; | |
268 | efi_systab.nr_tables = systab64->nr_tables; | |
1fec0533 DY |
269 | efi_systab.tables = data ? (unsigned long)data->tables : |
270 | systab64->tables; | |
271 | tmp |= data ? data->tables : systab64->tables; | |
1adbfa35 | 272 | |
abc93f8e | 273 | early_memunmap(systab64, sizeof(*systab64)); |
1fec0533 | 274 | if (data) |
abc93f8e | 275 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
276 | #ifdef CONFIG_X86_32 |
277 | if (tmp >> 32) { | |
278 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
279 | return -EINVAL; | |
280 | } | |
281 | #endif | |
282 | } else { | |
283 | efi_system_table_32_t *systab32; | |
284 | ||
abc93f8e | 285 | systab32 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
286 | sizeof(*systab32)); |
287 | if (systab32 == NULL) { | |
288 | pr_err("Couldn't map the system table!\n"); | |
289 | return -ENOMEM; | |
290 | } | |
291 | ||
292 | efi_systab.hdr = systab32->hdr; | |
293 | efi_systab.fw_vendor = systab32->fw_vendor; | |
294 | efi_systab.fw_revision = systab32->fw_revision; | |
295 | efi_systab.con_in_handle = systab32->con_in_handle; | |
296 | efi_systab.con_in = systab32->con_in; | |
297 | efi_systab.con_out_handle = systab32->con_out_handle; | |
298 | efi_systab.con_out = systab32->con_out; | |
299 | efi_systab.stderr_handle = systab32->stderr_handle; | |
300 | efi_systab.stderr = systab32->stderr; | |
301 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
302 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
303 | efi_systab.nr_tables = systab32->nr_tables; | |
304 | efi_systab.tables = systab32->tables; | |
305 | ||
abc93f8e | 306 | early_memunmap(systab32, sizeof(*systab32)); |
140bf275 | 307 | } |
1adbfa35 | 308 | |
5b83683f HY |
309 | efi.systab = &efi_systab; |
310 | ||
311 | /* | |
312 | * Verify the EFI Table | |
313 | */ | |
140bf275 | 314 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 315 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
316 | return -EINVAL; |
317 | } | |
5b83683f | 318 | if ((efi.systab->hdr.revision >> 16) == 0) |
9b7d2049 | 319 | pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n", |
5b83683f HY |
320 | efi.systab->hdr.revision >> 16, |
321 | efi.systab->hdr.revision & 0xffff); | |
140bf275 | 322 | |
0f8093a9 MF |
323 | set_bit(EFI_SYSTEM_TABLES, &efi.flags); |
324 | ||
140bf275 | 325 | return 0; |
83e7ee66 | 326 | } |
5b83683f | 327 | |
4f9dbcfc | 328 | static int __init efi_runtime_init32(void) |
83e7ee66 | 329 | { |
4f9dbcfc MF |
330 | efi_runtime_services_32_t *runtime; |
331 | ||
abc93f8e | 332 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc MF |
333 | sizeof(efi_runtime_services_32_t)); |
334 | if (!runtime) { | |
335 | pr_err("Could not map the runtime service table!\n"); | |
336 | return -ENOMEM; | |
337 | } | |
5b83683f HY |
338 | |
339 | /* | |
0ce4605c MK |
340 | * We will only need *early* access to the SetVirtualAddressMap |
341 | * EFI runtime service. All other runtime services will be called | |
342 | * via the virtual mapping. | |
5b83683f | 343 | */ |
4f9dbcfc MF |
344 | efi_phys.set_virtual_address_map = |
345 | (efi_set_virtual_address_map_t *) | |
346 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 347 | early_memunmap(runtime, sizeof(efi_runtime_services_32_t)); |
4f9dbcfc MF |
348 | |
349 | return 0; | |
350 | } | |
351 | ||
352 | static int __init efi_runtime_init64(void) | |
353 | { | |
354 | efi_runtime_services_64_t *runtime; | |
355 | ||
abc93f8e | 356 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc | 357 | sizeof(efi_runtime_services_64_t)); |
140bf275 | 358 | if (!runtime) { |
e3cb3f5a | 359 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
360 | return -ENOMEM; |
361 | } | |
4f9dbcfc | 362 | |
140bf275 | 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. | |
140bf275 | 367 | */ |
140bf275 | 368 | efi_phys.set_virtual_address_map = |
4f9dbcfc MF |
369 | (efi_set_virtual_address_map_t *) |
370 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 371 | early_memunmap(runtime, sizeof(efi_runtime_services_64_t)); |
4f9dbcfc MF |
372 | |
373 | return 0; | |
374 | } | |
375 | ||
376 | static int __init efi_runtime_init(void) | |
377 | { | |
378 | int rv; | |
379 | ||
380 | /* | |
381 | * Check out the runtime services table. We need to map | |
382 | * the runtime services table so that we can grab the physical | |
383 | * address of several of the EFI runtime functions, needed to | |
384 | * set the firmware into virtual mode. | |
9f27bc54 DK |
385 | * |
386 | * When EFI_PARAVIRT is in force then we could not map runtime | |
387 | * service memory region because we do not have direct access to it. | |
388 | * However, runtime services are available through proxy functions | |
389 | * (e.g. in case of Xen dom0 EFI implementation they call special | |
390 | * hypercall which executes relevant EFI functions) and that is why | |
391 | * they are always enabled. | |
4f9dbcfc | 392 | */ |
4f9dbcfc | 393 | |
9f27bc54 DK |
394 | if (!efi_enabled(EFI_PARAVIRT)) { |
395 | if (efi_enabled(EFI_64BIT)) | |
396 | rv = efi_runtime_init64(); | |
397 | else | |
398 | rv = efi_runtime_init32(); | |
399 | ||
400 | if (rv) | |
401 | return rv; | |
402 | } | |
140bf275 | 403 | |
0f8093a9 MF |
404 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
405 | ||
140bf275 | 406 | return 0; |
83e7ee66 | 407 | } |
5b83683f | 408 | |
140bf275 | 409 | static int __init efi_memmap_init(void) |
83e7ee66 | 410 | { |
9f27bc54 DK |
411 | if (efi_enabled(EFI_PARAVIRT)) |
412 | return 0; | |
413 | ||
5b83683f | 414 | /* Map the EFI memory map */ |
abc93f8e | 415 | memmap.map = early_memremap((unsigned long)memmap.phys_map, |
beacfaac | 416 | memmap.nr_map * memmap.desc_size); |
140bf275 | 417 | if (memmap.map == NULL) { |
e3cb3f5a | 418 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
419 | return -ENOMEM; |
420 | } | |
5b83683f | 421 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 422 | |
200001eb PJ |
423 | if (add_efi_memmap) |
424 | do_add_efi_memmap(); | |
140bf275 | 425 | |
0f8093a9 MF |
426 | set_bit(EFI_MEMMAP, &efi.flags); |
427 | ||
140bf275 | 428 | return 0; |
83e7ee66 OJ |
429 | } |
430 | ||
431 | void __init efi_init(void) | |
432 | { | |
433 | efi_char16_t *c16; | |
434 | char vendor[100] = "unknown"; | |
435 | int i = 0; | |
436 | void *tmp; | |
437 | ||
438 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
439 | if (boot_params.efi_info.efi_systab_hi || |
440 | boot_params.efi_info.efi_memmap_hi) { | |
441 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
442 | return; |
443 | } | |
83e7ee66 OJ |
444 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
445 | #else | |
446 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
447 | (boot_params.efi_info.efi_systab | |
448 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
449 | #endif |
450 | ||
83e68189 | 451 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 452 | return; |
83e68189 | 453 | |
a0998eb1 DY |
454 | efi.config_table = (unsigned long)efi.systab->tables; |
455 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; | |
456 | efi.runtime = (unsigned long)efi.systab->runtime; | |
457 | ||
83e7ee66 OJ |
458 | /* |
459 | * Show what we know for posterity | |
460 | */ | |
abc93f8e | 461 | c16 = tmp = early_memremap(efi.systab->fw_vendor, 2); |
83e7ee66 OJ |
462 | if (c16) { |
463 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
464 | vendor[i] = *c16++; | |
465 | vendor[i] = '\0'; | |
466 | } else | |
e3cb3f5a | 467 | pr_err("Could not map the firmware vendor!\n"); |
abc93f8e | 468 | early_memunmap(tmp, 2); |
83e7ee66 | 469 | |
e3cb3f5a OJ |
470 | pr_info("EFI v%u.%.02u by %s\n", |
471 | efi.systab->hdr.revision >> 16, | |
472 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 473 | |
1fec0533 DY |
474 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
475 | return; | |
476 | ||
272686bf | 477 | if (efi_config_init(arch_tables)) |
140bf275 | 478 | return; |
83e68189 | 479 | |
1adbfa35 OJ |
480 | /* |
481 | * Note: We currently don't support runtime services on an EFI | |
482 | * that doesn't match the kernel 32/64-bit mode. | |
483 | */ | |
484 | ||
7d453eee | 485 | if (!efi_runtime_supported()) |
1adbfa35 | 486 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 487 | else { |
b2e0a54a | 488 | if (efi_runtime_disabled() || efi_runtime_init()) |
83e68189 | 489 | return; |
140bf275 | 490 | } |
83e68189 | 491 | if (efi_memmap_init()) |
140bf275 | 492 | return; |
83e68189 | 493 | |
5b83683f | 494 | print_efi_memmap(); |
5b83683f HY |
495 | } |
496 | ||
2223af38 JT |
497 | void __init efi_late_init(void) |
498 | { | |
499 | efi_bgrt_init(); | |
500 | } | |
501 | ||
9cd2b07c MG |
502 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
503 | { | |
504 | u64 addr, npages; | |
505 | ||
506 | addr = md->virt_addr; | |
507 | npages = md->num_pages; | |
508 | ||
509 | memrange_efi_to_native(&addr, &npages); | |
510 | ||
511 | if (executable) | |
512 | set_memory_x(addr, npages); | |
513 | else | |
514 | set_memory_nx(addr, npages); | |
515 | } | |
516 | ||
c55d016f | 517 | void __init runtime_code_page_mkexec(void) |
a2172e25 HY |
518 | { |
519 | efi_memory_desc_t *md; | |
a2172e25 HY |
520 | void *p; |
521 | ||
a2172e25 HY |
522 | /* Make EFI runtime service code area executable */ |
523 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
524 | md = p; | |
1c083eb2 HY |
525 | |
526 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
527 | continue; | |
528 | ||
9cd2b07c | 529 | efi_set_executable(md, true); |
a2172e25 | 530 | } |
a2172e25 | 531 | } |
a2172e25 | 532 | |
4e78eb05 | 533 | void __init efi_memory_uc(u64 addr, unsigned long size) |
3e8fa263 MF |
534 | { |
535 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
536 | u64 npages; | |
537 | ||
538 | npages = round_up(size, page_shift) / page_shift; | |
539 | memrange_efi_to_native(&addr, &npages); | |
540 | set_memory_uc(addr, npages); | |
541 | } | |
542 | ||
d2f7cbe7 BP |
543 | void __init old_map_region(efi_memory_desc_t *md) |
544 | { | |
545 | u64 start_pfn, end_pfn, end; | |
546 | unsigned long size; | |
547 | void *va; | |
548 | ||
549 | start_pfn = PFN_DOWN(md->phys_addr); | |
550 | size = md->num_pages << PAGE_SHIFT; | |
551 | end = md->phys_addr + size; | |
552 | end_pfn = PFN_UP(end); | |
553 | ||
554 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { | |
555 | va = __va(md->phys_addr); | |
556 | ||
557 | if (!(md->attribute & EFI_MEMORY_WB)) | |
558 | efi_memory_uc((u64)(unsigned long)va, size); | |
559 | } else | |
560 | va = efi_ioremap(md->phys_addr, size, | |
561 | md->type, md->attribute); | |
562 | ||
563 | md->virt_addr = (u64) (unsigned long) va; | |
564 | if (!va) | |
565 | pr_err("ioremap of 0x%llX failed!\n", | |
566 | (unsigned long long)md->phys_addr); | |
567 | } | |
568 | ||
481f75c0 DY |
569 | /* Merge contiguous regions of the same type and attribute */ |
570 | static void __init efi_merge_regions(void) | |
5b83683f | 571 | { |
481f75c0 | 572 | void *p; |
202f9d0a | 573 | efi_memory_desc_t *md, *prev_md = NULL; |
202f9d0a | 574 | |
202f9d0a MG |
575 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
576 | u64 prev_size; | |
577 | md = p; | |
578 | ||
579 | if (!prev_md) { | |
580 | prev_md = md; | |
581 | continue; | |
582 | } | |
583 | ||
584 | if (prev_md->type != md->type || | |
585 | prev_md->attribute != md->attribute) { | |
586 | prev_md = md; | |
587 | continue; | |
588 | } | |
589 | ||
590 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
591 | ||
592 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
593 | prev_md->num_pages += md->num_pages; | |
594 | md->type = EFI_RESERVED_TYPE; | |
595 | md->attribute = 0; | |
596 | continue; | |
597 | } | |
598 | prev_md = md; | |
481f75c0 DY |
599 | } |
600 | } | |
601 | ||
602 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) | |
603 | { | |
604 | unsigned long size; | |
605 | u64 end, systab; | |
d2f7cbe7 | 606 | |
481f75c0 DY |
607 | size = md->num_pages << EFI_PAGE_SHIFT; |
608 | end = md->phys_addr + size; | |
609 | systab = (u64)(unsigned long)efi_phys.systab; | |
610 | if (md->phys_addr <= systab && systab < end) { | |
611 | systab += md->virt_addr - md->phys_addr; | |
612 | efi.systab = (efi_system_table_t *)(unsigned long)systab; | |
202f9d0a | 613 | } |
481f75c0 DY |
614 | } |
615 | ||
fabb37c7 | 616 | static void __init save_runtime_map(void) |
926172d4 | 617 | { |
fabb37c7 | 618 | #ifdef CONFIG_KEXEC |
926172d4 DY |
619 | efi_memory_desc_t *md; |
620 | void *tmp, *p, *q = NULL; | |
621 | int count = 0; | |
622 | ||
a3530e8f DY |
623 | if (efi_enabled(EFI_OLD_MEMMAP)) |
624 | return; | |
625 | ||
926172d4 DY |
626 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
627 | md = p; | |
628 | ||
629 | if (!(md->attribute & EFI_MEMORY_RUNTIME) || | |
630 | (md->type == EFI_BOOT_SERVICES_CODE) || | |
631 | (md->type == EFI_BOOT_SERVICES_DATA)) | |
632 | continue; | |
633 | tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL); | |
634 | if (!tmp) | |
635 | goto out; | |
636 | q = tmp; | |
637 | ||
638 | memcpy(q + count * memmap.desc_size, md, memmap.desc_size); | |
639 | count++; | |
640 | } | |
641 | ||
518548ab | 642 | efi_runtime_map_setup(q, count, memmap.desc_size); |
fabb37c7 | 643 | return; |
926172d4 | 644 | |
926172d4 DY |
645 | out: |
646 | kfree(q); | |
fabb37c7 BP |
647 | pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n"); |
648 | #endif | |
1fec0533 DY |
649 | } |
650 | ||
b7b898ae BP |
651 | static void *realloc_pages(void *old_memmap, int old_shift) |
652 | { | |
653 | void *ret; | |
654 | ||
655 | ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1); | |
656 | if (!ret) | |
657 | goto out; | |
658 | ||
659 | /* | |
660 | * A first-time allocation doesn't have anything to copy. | |
661 | */ | |
662 | if (!old_memmap) | |
663 | return ret; | |
664 | ||
665 | memcpy(ret, old_memmap, PAGE_SIZE << old_shift); | |
666 | ||
667 | out: | |
668 | free_pages((unsigned long)old_memmap, old_shift); | |
669 | return ret; | |
670 | } | |
671 | ||
481f75c0 | 672 | /* |
b7b898ae BP |
673 | * Map the efi memory ranges of the runtime services and update new_mmap with |
674 | * virtual addresses. | |
481f75c0 | 675 | */ |
b7b898ae | 676 | static void * __init efi_map_regions(int *count, int *pg_shift) |
481f75c0 | 677 | { |
b7b898ae BP |
678 | void *p, *new_memmap = NULL; |
679 | unsigned long left = 0; | |
481f75c0 | 680 | efi_memory_desc_t *md; |
202f9d0a | 681 | |
5b83683f HY |
682 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
683 | md = p; | |
70087011 JB |
684 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) { |
685 | #ifdef CONFIG_X86_64 | |
686 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
687 | md->type != EFI_BOOT_SERVICES_DATA) | |
688 | #endif | |
689 | continue; | |
690 | } | |
1c083eb2 | 691 | |
d2f7cbe7 | 692 | efi_map_region(md); |
481f75c0 DY |
693 | get_systab_virt_addr(md); |
694 | ||
b7b898ae BP |
695 | if (left < memmap.desc_size) { |
696 | new_memmap = realloc_pages(new_memmap, *pg_shift); | |
697 | if (!new_memmap) | |
698 | return NULL; | |
699 | ||
700 | left += PAGE_SIZE << *pg_shift; | |
701 | (*pg_shift)++; | |
702 | } | |
703 | ||
481f75c0 DY |
704 | memcpy(new_memmap + (*count * memmap.desc_size), md, |
705 | memmap.desc_size); | |
b7b898ae BP |
706 | |
707 | left -= memmap.desc_size; | |
481f75c0 DY |
708 | (*count)++; |
709 | } | |
d2f7cbe7 | 710 | |
481f75c0 | 711 | return new_memmap; |
481f75c0 DY |
712 | } |
713 | ||
fabb37c7 BP |
714 | static void __init kexec_enter_virtual_mode(void) |
715 | { | |
716 | #ifdef CONFIG_KEXEC | |
717 | efi_memory_desc_t *md; | |
718 | void *p; | |
719 | ||
720 | efi.systab = NULL; | |
721 | ||
722 | /* | |
723 | * We don't do virtual mode, since we don't do runtime services, on | |
724 | * non-native EFI | |
725 | */ | |
726 | if (!efi_is_native()) { | |
727 | efi_unmap_memmap(); | |
a5a750a9 | 728 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 BP |
729 | return; |
730 | } | |
731 | ||
732 | /* | |
733 | * Map efi regions which were passed via setup_data. The virt_addr is a | |
734 | * fixed addr which was used in first kernel of a kexec boot. | |
735 | */ | |
736 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
737 | md = p; | |
738 | efi_map_region_fixed(md); /* FIXME: add error handling */ | |
739 | get_systab_virt_addr(md); | |
740 | } | |
741 | ||
742 | save_runtime_map(); | |
743 | ||
744 | BUG_ON(!efi.systab); | |
745 | ||
746 | efi_sync_low_kernel_mappings(); | |
747 | ||
748 | /* | |
749 | * Now that EFI is in virtual mode, update the function | |
750 | * pointers in the runtime service table to the new virtual addresses. | |
751 | * | |
752 | * Call EFI services through wrapper functions. | |
753 | */ | |
754 | efi.runtime_version = efi_systab.hdr.revision; | |
994448f1 | 755 | |
022ee6c5 | 756 | efi_native_runtime_setup(); |
994448f1 | 757 | |
fabb37c7 | 758 | efi.set_virtual_address_map = NULL; |
fabb37c7 BP |
759 | |
760 | if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX)) | |
761 | runtime_code_page_mkexec(); | |
762 | ||
763 | /* clean DUMMY object */ | |
eeb9db09 | 764 | efi_delete_dummy_variable(); |
fabb37c7 BP |
765 | #endif |
766 | } | |
767 | ||
481f75c0 DY |
768 | /* |
769 | * This function will switch the EFI runtime services to virtual mode. | |
770 | * Essentially, we look through the EFI memmap and map every region that | |
771 | * has the runtime attribute bit set in its memory descriptor into the | |
772 | * ->trampoline_pgd page table using a top-down VA allocation scheme. | |
773 | * | |
774 | * The old method which used to update that memory descriptor with the | |
775 | * virtual address obtained from ioremap() is still supported when the | |
776 | * kernel is booted with efi=old_map on its command line. Same old | |
777 | * method enabled the runtime services to be called without having to | |
778 | * thunk back into physical mode for every invocation. | |
779 | * | |
780 | * The new method does a pagetable switch in a preemption-safe manner | |
781 | * so that we're in a different address space when calling a runtime | |
782 | * function. For function arguments passing we do copy the PGDs of the | |
783 | * kernel page table into ->trampoline_pgd prior to each call. | |
1fec0533 DY |
784 | * |
785 | * Specially for kexec boot, efi runtime maps in previous kernel should | |
786 | * be passed in via setup_data. In that case runtime ranges will be mapped | |
fabb37c7 BP |
787 | * to the same virtual addresses as the first kernel, see |
788 | * kexec_enter_virtual_mode(). | |
481f75c0 | 789 | */ |
fabb37c7 | 790 | static void __init __efi_enter_virtual_mode(void) |
481f75c0 | 791 | { |
fabb37c7 | 792 | int count = 0, pg_shift = 0; |
481f75c0 | 793 | void *new_memmap = NULL; |
b7b898ae | 794 | efi_status_t status; |
1c083eb2 | 795 | |
481f75c0 | 796 | efi.systab = NULL; |
d2f7cbe7 | 797 | |
fabb37c7 BP |
798 | efi_merge_regions(); |
799 | new_memmap = efi_map_regions(&count, &pg_shift); | |
800 | if (!new_memmap) { | |
801 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); | |
a5a750a9 | 802 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 | 803 | return; |
b7b898ae | 804 | } |
926172d4 | 805 | |
fabb37c7 BP |
806 | save_runtime_map(); |
807 | ||
5b83683f HY |
808 | BUG_ON(!efi.systab); |
809 | ||
a5a750a9 DY |
810 | if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) { |
811 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
fabb37c7 | 812 | return; |
a5a750a9 | 813 | } |
b7b898ae | 814 | |
d2f7cbe7 | 815 | efi_sync_low_kernel_mappings(); |
11cc8512 | 816 | efi_dump_pagetable(); |
d2f7cbe7 | 817 | |
994448f1 MF |
818 | if (efi_is_native()) { |
819 | status = phys_efi_set_virtual_address_map( | |
820 | memmap.desc_size * count, | |
821 | memmap.desc_size, | |
822 | memmap.desc_version, | |
823 | (efi_memory_desc_t *)__pa(new_memmap)); | |
824 | } else { | |
825 | status = efi_thunk_set_virtual_address_map( | |
826 | efi_phys.set_virtual_address_map, | |
827 | memmap.desc_size * count, | |
828 | memmap.desc_size, | |
829 | memmap.desc_version, | |
830 | (efi_memory_desc_t *)__pa(new_memmap)); | |
831 | } | |
1fec0533 | 832 | |
fabb37c7 BP |
833 | if (status != EFI_SUCCESS) { |
834 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", | |
835 | status); | |
836 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
5b83683f HY |
837 | } |
838 | ||
839 | /* | |
840 | * Now that EFI is in virtual mode, update the function | |
841 | * pointers in the runtime service table to the new virtual addresses. | |
842 | * | |
843 | * Call EFI services through wrapper functions. | |
844 | */ | |
712ba9e9 | 845 | efi.runtime_version = efi_systab.hdr.revision; |
4f9dbcfc MF |
846 | |
847 | if (efi_is_native()) | |
022ee6c5 | 848 | efi_native_runtime_setup(); |
4f9dbcfc MF |
849 | else |
850 | efi_thunk_runtime_setup(); | |
851 | ||
2b5e8ef3 | 852 | efi.set_virtual_address_map = NULL; |
d2f7cbe7 | 853 | |
c55d016f | 854 | efi_runtime_mkexec(); |
1adbfa35 | 855 | |
b7b898ae BP |
856 | /* |
857 | * We mapped the descriptor array into the EFI pagetable above but we're | |
858 | * not unmapping it here. Here's why: | |
859 | * | |
860 | * We're copying select PGDs from the kernel page table to the EFI page | |
861 | * table and when we do so and make changes to those PGDs like unmapping | |
862 | * stuff from them, those changes appear in the kernel page table and we | |
863 | * go boom. | |
864 | * | |
865 | * From setup_real_mode(): | |
866 | * | |
867 | * ... | |
868 | * trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd; | |
869 | * | |
870 | * In this particular case, our allocation is in PGD 0 of the EFI page | |
871 | * table but we've copied that PGD from PGD[272] of the EFI page table: | |
872 | * | |
873 | * pgd_index(__PAGE_OFFSET = 0xffff880000000000) = 272 | |
874 | * | |
875 | * where the direct memory mapping in kernel space is. | |
876 | * | |
877 | * new_memmap's VA comes from that direct mapping and thus clearing it, | |
878 | * it would get cleared in the kernel page table too. | |
879 | * | |
880 | * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift); | |
881 | */ | |
fabb37c7 | 882 | free_pages((unsigned long)new_memmap, pg_shift); |
f8b84043 MG |
883 | |
884 | /* clean DUMMY object */ | |
eeb9db09 | 885 | efi_delete_dummy_variable(); |
5b83683f HY |
886 | } |
887 | ||
fabb37c7 BP |
888 | void __init efi_enter_virtual_mode(void) |
889 | { | |
9f27bc54 DK |
890 | if (efi_enabled(EFI_PARAVIRT)) |
891 | return; | |
892 | ||
fabb37c7 BP |
893 | if (efi_setup) |
894 | kexec_enter_virtual_mode(); | |
895 | else | |
896 | __efi_enter_virtual_mode(); | |
897 | } | |
898 | ||
5b83683f HY |
899 | /* |
900 | * Convenience functions to obtain memory types and attributes | |
901 | */ | |
902 | u32 efi_mem_type(unsigned long phys_addr) | |
903 | { | |
904 | efi_memory_desc_t *md; | |
905 | void *p; | |
906 | ||
83e68189 MF |
907 | if (!efi_enabled(EFI_MEMMAP)) |
908 | return 0; | |
909 | ||
5b83683f HY |
910 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
911 | md = p; | |
912 | if ((md->phys_addr <= phys_addr) && | |
913 | (phys_addr < (md->phys_addr + | |
914 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
915 | return md->type; | |
916 | } | |
917 | return 0; | |
918 | } | |
919 | ||
920 | u64 efi_mem_attributes(unsigned long phys_addr) | |
921 | { | |
922 | efi_memory_desc_t *md; | |
923 | void *p; | |
924 | ||
67a9b9c5 DK |
925 | if (!efi_enabled(EFI_MEMMAP)) |
926 | return 0; | |
927 | ||
5b83683f HY |
928 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
929 | md = p; | |
930 | if ((md->phys_addr <= phys_addr) && | |
931 | (phys_addr < (md->phys_addr + | |
932 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
933 | return md->attribute; | |
934 | } | |
935 | return 0; | |
936 | } | |
a6e4d5a0 | 937 | |
5ae3683c | 938 | static int __init arch_parse_efi_cmdline(char *str) |
d2f7cbe7 | 939 | { |
6ccc72b8 DY |
940 | if (parse_option_str(str, "old_map")) |
941 | set_bit(EFI_OLD_MEMMAP, &efi.flags); | |
d2f7cbe7 BP |
942 | |
943 | return 0; | |
944 | } | |
5ae3683c | 945 | early_param("efi", arch_parse_efi_cmdline); |