Commit | Line | Data |
---|---|---|
5b83683f HY |
1 | /* |
2 | * Common EFI (Extensible Firmware Interface) support functions | |
3 | * Based on Extensible Firmware Interface Specification version 1.0 | |
4 | * | |
5 | * Copyright (C) 1999 VA Linux Systems | |
6 | * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> | |
7 | * Copyright (C) 1999-2002 Hewlett-Packard Co. | |
8 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
9 | * Stephane Eranian <eranian@hpl.hp.com> | |
10 | * Copyright (C) 2005-2008 Intel Co. | |
11 | * Fenghua Yu <fenghua.yu@intel.com> | |
12 | * Bibo Mao <bibo.mao@intel.com> | |
13 | * Chandramouli Narayanan <mouli@linux.intel.com> | |
14 | * Huang Ying <ying.huang@intel.com> | |
d2f7cbe7 BP |
15 | * Copyright (C) 2013 SuSE Labs |
16 | * Borislav Petkov <bp@suse.de> - runtime services VA mapping | |
5b83683f HY |
17 | * |
18 | * Copied from efi_32.c to eliminate the duplicated code between EFI | |
19 | * 32/64 support code. --ying 2007-10-26 | |
20 | * | |
21 | * All EFI Runtime Services are not implemented yet as EFI only | |
22 | * supports physical mode addressing on SoftSDV. This is to be fixed | |
23 | * in a future version. --drummond 1999-07-20 | |
24 | * | |
25 | * Implemented EFI runtime services and virtual mode calls. --davidm | |
26 | * | |
27 | * Goutham Rao: <goutham.rao@intel.com> | |
28 | * Skip non-WB memory and ignore empty memory ranges. | |
29 | */ | |
30 | ||
e3cb3f5a OJ |
31 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
32 | ||
5b83683f HY |
33 | #include <linux/kernel.h> |
34 | #include <linux/init.h> | |
35 | #include <linux/efi.h> | |
2223af38 | 36 | #include <linux/efi-bgrt.h> |
69c60c88 | 37 | #include <linux/export.h> |
5b83683f | 38 | #include <linux/bootmem.h> |
0d01ff25 | 39 | #include <linux/slab.h> |
a9ce6bc1 | 40 | #include <linux/memblock.h> |
5b83683f HY |
41 | #include <linux/spinlock.h> |
42 | #include <linux/uaccess.h> | |
43 | #include <linux/time.h> | |
44 | #include <linux/io.h> | |
45 | #include <linux/reboot.h> | |
46 | #include <linux/bcd.h> | |
47 | ||
48 | #include <asm/setup.h> | |
49 | #include <asm/efi.h> | |
50 | #include <asm/time.h> | |
a2172e25 HY |
51 | #include <asm/cacheflush.h> |
52 | #include <asm/tlbflush.h> | |
7bd867df | 53 | #include <asm/x86_init.h> |
3195ef59 | 54 | #include <asm/rtc.h> |
a5d90c92 | 55 | #include <asm/uv/uv.h> |
5b83683f | 56 | |
f4fccac0 | 57 | #define EFI_DEBUG |
5b83683f | 58 | |
5b83683f HY |
59 | struct efi_memory_map memmap; |
60 | ||
ecaea42e | 61 | static struct efi efi_phys __initdata; |
5b83683f HY |
62 | static efi_system_table_t efi_systab __initdata; |
63 | ||
9b7d2049 | 64 | static efi_config_table_type_t arch_tables[] __initdata = { |
272686bf LL |
65 | #ifdef CONFIG_X86_UV |
66 | {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab}, | |
67 | #endif | |
722da9d2 | 68 | {NULL_GUID, NULL, NULL}, |
272686bf LL |
69 | }; |
70 | ||
1fec0533 | 71 | u64 efi_setup; /* efi setup_data physical address */ |
926172d4 | 72 | |
200001eb PJ |
73 | int add_efi_memmap; |
74 | EXPORT_SYMBOL(add_efi_memmap); | |
75 | ||
76 | static int __init setup_add_efi_memmap(char *arg) | |
77 | { | |
78 | add_efi_memmap = 1; | |
79 | return 0; | |
80 | } | |
81 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
82 | ||
5b83683f HY |
83 | static efi_status_t __init phys_efi_set_virtual_address_map( |
84 | unsigned long memory_map_size, | |
85 | unsigned long descriptor_size, | |
86 | u32 descriptor_version, | |
87 | efi_memory_desc_t *virtual_map) | |
88 | { | |
89 | efi_status_t status; | |
90 | ||
91 | efi_call_phys_prelog(); | |
62fa6e69 MF |
92 | status = efi_call_phys(efi_phys.set_virtual_address_map, |
93 | memory_map_size, descriptor_size, | |
94 | descriptor_version, virtual_map); | |
5b83683f HY |
95 | efi_call_phys_epilog(); |
96 | return status; | |
97 | } | |
98 | ||
3565184e | 99 | void efi_get_time(struct timespec *now) |
5b83683f HY |
100 | { |
101 | efi_status_t status; | |
102 | efi_time_t eft; | |
103 | efi_time_cap_t cap; | |
104 | ||
105 | status = efi.get_time(&eft, &cap); | |
106 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 107 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f | 108 | |
3565184e DV |
109 | now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour, |
110 | eft.minute, eft.second); | |
111 | now->tv_nsec = 0; | |
5b83683f HY |
112 | } |
113 | ||
69c91893 PJ |
114 | /* |
115 | * Tell the kernel about the EFI memory map. This might include | |
116 | * more than the max 128 entries that can fit in the e820 legacy | |
117 | * (zeropage) memory map. | |
118 | */ | |
119 | ||
200001eb | 120 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
121 | { |
122 | void *p; | |
123 | ||
124 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
125 | efi_memory_desc_t *md = p; | |
126 | unsigned long long start = md->phys_addr; | |
127 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
128 | int e820_type; | |
129 | ||
e2a71476 CW |
130 | switch (md->type) { |
131 | case EFI_LOADER_CODE: | |
132 | case EFI_LOADER_DATA: | |
133 | case EFI_BOOT_SERVICES_CODE: | |
134 | case EFI_BOOT_SERVICES_DATA: | |
135 | case EFI_CONVENTIONAL_MEMORY: | |
136 | if (md->attribute & EFI_MEMORY_WB) | |
137 | e820_type = E820_RAM; | |
138 | else | |
139 | e820_type = E820_RESERVED; | |
140 | break; | |
141 | case EFI_ACPI_RECLAIM_MEMORY: | |
142 | e820_type = E820_ACPI; | |
143 | break; | |
144 | case EFI_ACPI_MEMORY_NVS: | |
145 | e820_type = E820_NVS; | |
146 | break; | |
147 | case EFI_UNUSABLE_MEMORY: | |
148 | e820_type = E820_UNUSABLE; | |
149 | break; | |
150 | default: | |
151 | /* | |
152 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
153 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
154 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
155 | */ | |
69c91893 | 156 | e820_type = E820_RESERVED; |
e2a71476 CW |
157 | break; |
158 | } | |
d0be6bde | 159 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
160 | } |
161 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
162 | } | |
163 | ||
1adbfa35 | 164 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 165 | { |
15b9c359 | 166 | struct efi_info *e = &boot_params.efi_info; |
ecacf09f HY |
167 | unsigned long pmap; |
168 | ||
9f27bc54 DK |
169 | if (efi_enabled(EFI_PARAVIRT)) |
170 | return 0; | |
171 | ||
05486fa7 | 172 | #ifdef CONFIG_X86_32 |
1adbfa35 | 173 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 174 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
175 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
176 | return -EINVAL; | |
177 | } | |
15b9c359 | 178 | pmap = e->efi_memmap; |
05486fa7 | 179 | #else |
15b9c359 | 180 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 181 | #endif |
15b9c359 BP |
182 | memmap.phys_map = (void *)pmap; |
183 | memmap.nr_map = e->efi_memmap_size / | |
184 | e->efi_memdesc_size; | |
185 | memmap.desc_size = e->efi_memdesc_size; | |
186 | memmap.desc_version = e->efi_memdesc_version; | |
187 | ||
24aa0788 | 188 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
1adbfa35 | 189 | |
258f6fd7 LL |
190 | efi.memmap = &memmap; |
191 | ||
1adbfa35 | 192 | return 0; |
ecacf09f HY |
193 | } |
194 | ||
5b83683f HY |
195 | static void __init print_efi_memmap(void) |
196 | { | |
f4fccac0 | 197 | #ifdef EFI_DEBUG |
5b83683f HY |
198 | efi_memory_desc_t *md; |
199 | void *p; | |
200 | int i; | |
201 | ||
202 | for (p = memmap.map, i = 0; | |
203 | p < memmap.map_end; | |
204 | p += memmap.desc_size, i++) { | |
ace1d121 LE |
205 | char buf[64]; |
206 | ||
5b83683f | 207 | md = p; |
ace1d121 LE |
208 | pr_info("mem%02u: %s range=[0x%016llx-0x%016llx) (%lluMB)\n", |
209 | i, efi_md_typeattr_format(buf, sizeof(buf), md), | |
210 | md->phys_addr, | |
5b83683f HY |
211 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), |
212 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
213 | } | |
5b83683f | 214 | #endif /* EFI_DEBUG */ |
f4fccac0 | 215 | } |
5b83683f | 216 | |
5189c2a7 | 217 | void __init efi_unmap_memmap(void) |
78510792 | 218 | { |
3e909599 | 219 | clear_bit(EFI_MEMMAP, &efi.flags); |
78510792 | 220 | if (memmap.map) { |
abc93f8e | 221 | early_memunmap(memmap.map, memmap.nr_map * memmap.desc_size); |
78510792 JT |
222 | memmap.map = NULL; |
223 | } | |
224 | } | |
225 | ||
140bf275 | 226 | static int __init efi_systab_init(void *phys) |
5b83683f | 227 | { |
83e68189 | 228 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 | 229 | efi_system_table_64_t *systab64; |
1fec0533 | 230 | struct efi_setup_data *data = NULL; |
1adbfa35 OJ |
231 | u64 tmp = 0; |
232 | ||
1fec0533 DY |
233 | if (efi_setup) { |
234 | data = early_memremap(efi_setup, sizeof(*data)); | |
235 | if (!data) | |
236 | return -ENOMEM; | |
237 | } | |
abc93f8e | 238 | systab64 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
239 | sizeof(*systab64)); |
240 | if (systab64 == NULL) { | |
241 | pr_err("Couldn't map the system table!\n"); | |
1fec0533 | 242 | if (data) |
abc93f8e | 243 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
244 | return -ENOMEM; |
245 | } | |
246 | ||
247 | efi_systab.hdr = systab64->hdr; | |
1fec0533 DY |
248 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
249 | systab64->fw_vendor; | |
250 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; | |
1adbfa35 OJ |
251 | efi_systab.fw_revision = systab64->fw_revision; |
252 | efi_systab.con_in_handle = systab64->con_in_handle; | |
253 | tmp |= systab64->con_in_handle; | |
254 | efi_systab.con_in = systab64->con_in; | |
255 | tmp |= systab64->con_in; | |
256 | efi_systab.con_out_handle = systab64->con_out_handle; | |
257 | tmp |= systab64->con_out_handle; | |
258 | efi_systab.con_out = systab64->con_out; | |
259 | tmp |= systab64->con_out; | |
260 | efi_systab.stderr_handle = systab64->stderr_handle; | |
261 | tmp |= systab64->stderr_handle; | |
262 | efi_systab.stderr = systab64->stderr; | |
263 | tmp |= systab64->stderr; | |
1fec0533 DY |
264 | efi_systab.runtime = data ? |
265 | (void *)(unsigned long)data->runtime : | |
266 | (void *)(unsigned long)systab64->runtime; | |
267 | tmp |= data ? data->runtime : systab64->runtime; | |
1adbfa35 OJ |
268 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
269 | tmp |= systab64->boottime; | |
270 | efi_systab.nr_tables = systab64->nr_tables; | |
1fec0533 DY |
271 | efi_systab.tables = data ? (unsigned long)data->tables : |
272 | systab64->tables; | |
273 | tmp |= data ? data->tables : systab64->tables; | |
1adbfa35 | 274 | |
abc93f8e | 275 | early_memunmap(systab64, sizeof(*systab64)); |
1fec0533 | 276 | if (data) |
abc93f8e | 277 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
278 | #ifdef CONFIG_X86_32 |
279 | if (tmp >> 32) { | |
280 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
281 | return -EINVAL; | |
282 | } | |
283 | #endif | |
284 | } else { | |
285 | efi_system_table_32_t *systab32; | |
286 | ||
abc93f8e | 287 | systab32 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
288 | sizeof(*systab32)); |
289 | if (systab32 == NULL) { | |
290 | pr_err("Couldn't map the system table!\n"); | |
291 | return -ENOMEM; | |
292 | } | |
293 | ||
294 | efi_systab.hdr = systab32->hdr; | |
295 | efi_systab.fw_vendor = systab32->fw_vendor; | |
296 | efi_systab.fw_revision = systab32->fw_revision; | |
297 | efi_systab.con_in_handle = systab32->con_in_handle; | |
298 | efi_systab.con_in = systab32->con_in; | |
299 | efi_systab.con_out_handle = systab32->con_out_handle; | |
300 | efi_systab.con_out = systab32->con_out; | |
301 | efi_systab.stderr_handle = systab32->stderr_handle; | |
302 | efi_systab.stderr = systab32->stderr; | |
303 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
304 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
305 | efi_systab.nr_tables = systab32->nr_tables; | |
306 | efi_systab.tables = systab32->tables; | |
307 | ||
abc93f8e | 308 | early_memunmap(systab32, sizeof(*systab32)); |
140bf275 | 309 | } |
1adbfa35 | 310 | |
5b83683f HY |
311 | efi.systab = &efi_systab; |
312 | ||
313 | /* | |
314 | * Verify the EFI Table | |
315 | */ | |
140bf275 | 316 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 317 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
318 | return -EINVAL; |
319 | } | |
5b83683f | 320 | if ((efi.systab->hdr.revision >> 16) == 0) |
9b7d2049 | 321 | pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n", |
5b83683f HY |
322 | efi.systab->hdr.revision >> 16, |
323 | efi.systab->hdr.revision & 0xffff); | |
140bf275 | 324 | |
0f8093a9 MF |
325 | set_bit(EFI_SYSTEM_TABLES, &efi.flags); |
326 | ||
140bf275 | 327 | return 0; |
83e7ee66 | 328 | } |
5b83683f | 329 | |
4f9dbcfc | 330 | static int __init efi_runtime_init32(void) |
83e7ee66 | 331 | { |
4f9dbcfc MF |
332 | efi_runtime_services_32_t *runtime; |
333 | ||
abc93f8e | 334 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc MF |
335 | sizeof(efi_runtime_services_32_t)); |
336 | if (!runtime) { | |
337 | pr_err("Could not map the runtime service table!\n"); | |
338 | return -ENOMEM; | |
339 | } | |
5b83683f HY |
340 | |
341 | /* | |
4f9dbcfc MF |
342 | * We will only need *early* access to the following two |
343 | * EFI runtime services before set_virtual_address_map | |
344 | * is invoked. | |
5b83683f | 345 | */ |
4f9dbcfc MF |
346 | efi_phys.set_virtual_address_map = |
347 | (efi_set_virtual_address_map_t *) | |
348 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 349 | early_memunmap(runtime, sizeof(efi_runtime_services_32_t)); |
4f9dbcfc MF |
350 | |
351 | return 0; | |
352 | } | |
353 | ||
354 | static int __init efi_runtime_init64(void) | |
355 | { | |
356 | efi_runtime_services_64_t *runtime; | |
357 | ||
abc93f8e | 358 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc | 359 | sizeof(efi_runtime_services_64_t)); |
140bf275 | 360 | if (!runtime) { |
e3cb3f5a | 361 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
362 | return -ENOMEM; |
363 | } | |
4f9dbcfc | 364 | |
140bf275 | 365 | /* |
4f9dbcfc MF |
366 | * We will only need *early* access to the following two |
367 | * EFI runtime services before set_virtual_address_map | |
140bf275 OJ |
368 | * is invoked. |
369 | */ | |
140bf275 | 370 | efi_phys.set_virtual_address_map = |
4f9dbcfc MF |
371 | (efi_set_virtual_address_map_t *) |
372 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 373 | early_memunmap(runtime, sizeof(efi_runtime_services_64_t)); |
4f9dbcfc MF |
374 | |
375 | return 0; | |
376 | } | |
377 | ||
378 | static int __init efi_runtime_init(void) | |
379 | { | |
380 | int rv; | |
381 | ||
382 | /* | |
383 | * Check out the runtime services table. We need to map | |
384 | * the runtime services table so that we can grab the physical | |
385 | * address of several of the EFI runtime functions, needed to | |
386 | * set the firmware into virtual mode. | |
9f27bc54 DK |
387 | * |
388 | * When EFI_PARAVIRT is in force then we could not map runtime | |
389 | * service memory region because we do not have direct access to it. | |
390 | * However, runtime services are available through proxy functions | |
391 | * (e.g. in case of Xen dom0 EFI implementation they call special | |
392 | * hypercall which executes relevant EFI functions) and that is why | |
393 | * they are always enabled. | |
4f9dbcfc | 394 | */ |
4f9dbcfc | 395 | |
9f27bc54 DK |
396 | if (!efi_enabled(EFI_PARAVIRT)) { |
397 | if (efi_enabled(EFI_64BIT)) | |
398 | rv = efi_runtime_init64(); | |
399 | else | |
400 | rv = efi_runtime_init32(); | |
401 | ||
402 | if (rv) | |
403 | return rv; | |
404 | } | |
140bf275 | 405 | |
0f8093a9 MF |
406 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
407 | ||
140bf275 | 408 | return 0; |
83e7ee66 | 409 | } |
5b83683f | 410 | |
140bf275 | 411 | static int __init efi_memmap_init(void) |
83e7ee66 | 412 | { |
9f27bc54 DK |
413 | if (efi_enabled(EFI_PARAVIRT)) |
414 | return 0; | |
415 | ||
5b83683f | 416 | /* Map the EFI memory map */ |
abc93f8e | 417 | memmap.map = early_memremap((unsigned long)memmap.phys_map, |
beacfaac | 418 | memmap.nr_map * memmap.desc_size); |
140bf275 | 419 | if (memmap.map == NULL) { |
e3cb3f5a | 420 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
421 | return -ENOMEM; |
422 | } | |
5b83683f | 423 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 424 | |
200001eb PJ |
425 | if (add_efi_memmap) |
426 | do_add_efi_memmap(); | |
140bf275 | 427 | |
0f8093a9 MF |
428 | set_bit(EFI_MEMMAP, &efi.flags); |
429 | ||
140bf275 | 430 | return 0; |
83e7ee66 OJ |
431 | } |
432 | ||
433 | void __init efi_init(void) | |
434 | { | |
435 | efi_char16_t *c16; | |
436 | char vendor[100] = "unknown"; | |
437 | int i = 0; | |
438 | void *tmp; | |
439 | ||
440 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
441 | if (boot_params.efi_info.efi_systab_hi || |
442 | boot_params.efi_info.efi_memmap_hi) { | |
443 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
444 | return; |
445 | } | |
83e7ee66 OJ |
446 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
447 | #else | |
448 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
449 | (boot_params.efi_info.efi_systab | |
450 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
451 | #endif |
452 | ||
83e68189 | 453 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 454 | return; |
83e68189 | 455 | |
a0998eb1 DY |
456 | efi.config_table = (unsigned long)efi.systab->tables; |
457 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; | |
458 | efi.runtime = (unsigned long)efi.systab->runtime; | |
459 | ||
83e7ee66 OJ |
460 | /* |
461 | * Show what we know for posterity | |
462 | */ | |
abc93f8e | 463 | c16 = tmp = early_memremap(efi.systab->fw_vendor, 2); |
83e7ee66 OJ |
464 | if (c16) { |
465 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
466 | vendor[i] = *c16++; | |
467 | vendor[i] = '\0'; | |
468 | } else | |
e3cb3f5a | 469 | pr_err("Could not map the firmware vendor!\n"); |
abc93f8e | 470 | early_memunmap(tmp, 2); |
83e7ee66 | 471 | |
e3cb3f5a OJ |
472 | pr_info("EFI v%u.%.02u by %s\n", |
473 | efi.systab->hdr.revision >> 16, | |
474 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 475 | |
1fec0533 DY |
476 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
477 | return; | |
478 | ||
272686bf | 479 | if (efi_config_init(arch_tables)) |
140bf275 | 480 | return; |
83e68189 | 481 | |
1adbfa35 OJ |
482 | /* |
483 | * Note: We currently don't support runtime services on an EFI | |
484 | * that doesn't match the kernel 32/64-bit mode. | |
485 | */ | |
486 | ||
7d453eee | 487 | if (!efi_runtime_supported()) |
1adbfa35 | 488 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 489 | else { |
b2e0a54a | 490 | if (efi_runtime_disabled() || efi_runtime_init()) |
83e68189 | 491 | return; |
140bf275 | 492 | } |
83e68189 | 493 | if (efi_memmap_init()) |
140bf275 | 494 | return; |
83e68189 | 495 | |
5b83683f | 496 | print_efi_memmap(); |
5b83683f HY |
497 | } |
498 | ||
2223af38 JT |
499 | void __init efi_late_init(void) |
500 | { | |
501 | efi_bgrt_init(); | |
502 | } | |
503 | ||
9cd2b07c MG |
504 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
505 | { | |
506 | u64 addr, npages; | |
507 | ||
508 | addr = md->virt_addr; | |
509 | npages = md->num_pages; | |
510 | ||
511 | memrange_efi_to_native(&addr, &npages); | |
512 | ||
513 | if (executable) | |
514 | set_memory_x(addr, npages); | |
515 | else | |
516 | set_memory_nx(addr, npages); | |
517 | } | |
518 | ||
c55d016f | 519 | void __init runtime_code_page_mkexec(void) |
a2172e25 HY |
520 | { |
521 | efi_memory_desc_t *md; | |
a2172e25 HY |
522 | void *p; |
523 | ||
a2172e25 HY |
524 | /* Make EFI runtime service code area executable */ |
525 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
526 | md = p; | |
1c083eb2 HY |
527 | |
528 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
529 | continue; | |
530 | ||
9cd2b07c | 531 | efi_set_executable(md, true); |
a2172e25 | 532 | } |
a2172e25 | 533 | } |
a2172e25 | 534 | |
3e8fa263 MF |
535 | void efi_memory_uc(u64 addr, unsigned long size) |
536 | { | |
537 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
538 | u64 npages; | |
539 | ||
540 | npages = round_up(size, page_shift) / page_shift; | |
541 | memrange_efi_to_native(&addr, &npages); | |
542 | set_memory_uc(addr, npages); | |
543 | } | |
544 | ||
d2f7cbe7 BP |
545 | void __init old_map_region(efi_memory_desc_t *md) |
546 | { | |
547 | u64 start_pfn, end_pfn, end; | |
548 | unsigned long size; | |
549 | void *va; | |
550 | ||
551 | start_pfn = PFN_DOWN(md->phys_addr); | |
552 | size = md->num_pages << PAGE_SHIFT; | |
553 | end = md->phys_addr + size; | |
554 | end_pfn = PFN_UP(end); | |
555 | ||
556 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { | |
557 | va = __va(md->phys_addr); | |
558 | ||
559 | if (!(md->attribute & EFI_MEMORY_WB)) | |
560 | efi_memory_uc((u64)(unsigned long)va, size); | |
561 | } else | |
562 | va = efi_ioremap(md->phys_addr, size, | |
563 | md->type, md->attribute); | |
564 | ||
565 | md->virt_addr = (u64) (unsigned long) va; | |
566 | if (!va) | |
567 | pr_err("ioremap of 0x%llX failed!\n", | |
568 | (unsigned long long)md->phys_addr); | |
569 | } | |
570 | ||
481f75c0 DY |
571 | /* Merge contiguous regions of the same type and attribute */ |
572 | static void __init efi_merge_regions(void) | |
5b83683f | 573 | { |
481f75c0 | 574 | void *p; |
202f9d0a | 575 | efi_memory_desc_t *md, *prev_md = NULL; |
202f9d0a | 576 | |
202f9d0a MG |
577 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
578 | u64 prev_size; | |
579 | md = p; | |
580 | ||
581 | if (!prev_md) { | |
582 | prev_md = md; | |
583 | continue; | |
584 | } | |
585 | ||
586 | if (prev_md->type != md->type || | |
587 | prev_md->attribute != md->attribute) { | |
588 | prev_md = md; | |
589 | continue; | |
590 | } | |
591 | ||
592 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
593 | ||
594 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
595 | prev_md->num_pages += md->num_pages; | |
596 | md->type = EFI_RESERVED_TYPE; | |
597 | md->attribute = 0; | |
598 | continue; | |
599 | } | |
600 | prev_md = md; | |
481f75c0 DY |
601 | } |
602 | } | |
603 | ||
604 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) | |
605 | { | |
606 | unsigned long size; | |
607 | u64 end, systab; | |
d2f7cbe7 | 608 | |
481f75c0 DY |
609 | size = md->num_pages << EFI_PAGE_SHIFT; |
610 | end = md->phys_addr + size; | |
611 | systab = (u64)(unsigned long)efi_phys.systab; | |
612 | if (md->phys_addr <= systab && systab < end) { | |
613 | systab += md->virt_addr - md->phys_addr; | |
614 | efi.systab = (efi_system_table_t *)(unsigned long)systab; | |
202f9d0a | 615 | } |
481f75c0 DY |
616 | } |
617 | ||
fabb37c7 | 618 | static void __init save_runtime_map(void) |
926172d4 | 619 | { |
fabb37c7 | 620 | #ifdef CONFIG_KEXEC |
926172d4 DY |
621 | efi_memory_desc_t *md; |
622 | void *tmp, *p, *q = NULL; | |
623 | int count = 0; | |
624 | ||
a3530e8f DY |
625 | if (efi_enabled(EFI_OLD_MEMMAP)) |
626 | return; | |
627 | ||
926172d4 DY |
628 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
629 | md = p; | |
630 | ||
631 | if (!(md->attribute & EFI_MEMORY_RUNTIME) || | |
632 | (md->type == EFI_BOOT_SERVICES_CODE) || | |
633 | (md->type == EFI_BOOT_SERVICES_DATA)) | |
634 | continue; | |
635 | tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL); | |
636 | if (!tmp) | |
637 | goto out; | |
638 | q = tmp; | |
639 | ||
640 | memcpy(q + count * memmap.desc_size, md, memmap.desc_size); | |
641 | count++; | |
642 | } | |
643 | ||
518548ab | 644 | efi_runtime_map_setup(q, count, memmap.desc_size); |
fabb37c7 | 645 | return; |
926172d4 | 646 | |
926172d4 DY |
647 | out: |
648 | kfree(q); | |
fabb37c7 BP |
649 | pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n"); |
650 | #endif | |
1fec0533 DY |
651 | } |
652 | ||
b7b898ae BP |
653 | static void *realloc_pages(void *old_memmap, int old_shift) |
654 | { | |
655 | void *ret; | |
656 | ||
657 | ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1); | |
658 | if (!ret) | |
659 | goto out; | |
660 | ||
661 | /* | |
662 | * A first-time allocation doesn't have anything to copy. | |
663 | */ | |
664 | if (!old_memmap) | |
665 | return ret; | |
666 | ||
667 | memcpy(ret, old_memmap, PAGE_SIZE << old_shift); | |
668 | ||
669 | out: | |
670 | free_pages((unsigned long)old_memmap, old_shift); | |
671 | return ret; | |
672 | } | |
673 | ||
481f75c0 | 674 | /* |
b7b898ae BP |
675 | * Map the efi memory ranges of the runtime services and update new_mmap with |
676 | * virtual addresses. | |
481f75c0 | 677 | */ |
b7b898ae | 678 | static void * __init efi_map_regions(int *count, int *pg_shift) |
481f75c0 | 679 | { |
b7b898ae BP |
680 | void *p, *new_memmap = NULL; |
681 | unsigned long left = 0; | |
481f75c0 | 682 | efi_memory_desc_t *md; |
202f9d0a | 683 | |
5b83683f HY |
684 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
685 | md = p; | |
70087011 JB |
686 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) { |
687 | #ifdef CONFIG_X86_64 | |
688 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
689 | md->type != EFI_BOOT_SERVICES_DATA) | |
690 | #endif | |
691 | continue; | |
692 | } | |
1c083eb2 | 693 | |
d2f7cbe7 | 694 | efi_map_region(md); |
481f75c0 DY |
695 | get_systab_virt_addr(md); |
696 | ||
b7b898ae BP |
697 | if (left < memmap.desc_size) { |
698 | new_memmap = realloc_pages(new_memmap, *pg_shift); | |
699 | if (!new_memmap) | |
700 | return NULL; | |
701 | ||
702 | left += PAGE_SIZE << *pg_shift; | |
703 | (*pg_shift)++; | |
704 | } | |
705 | ||
481f75c0 DY |
706 | memcpy(new_memmap + (*count * memmap.desc_size), md, |
707 | memmap.desc_size); | |
b7b898ae BP |
708 | |
709 | left -= memmap.desc_size; | |
481f75c0 DY |
710 | (*count)++; |
711 | } | |
d2f7cbe7 | 712 | |
481f75c0 | 713 | return new_memmap; |
481f75c0 DY |
714 | } |
715 | ||
fabb37c7 BP |
716 | static void __init kexec_enter_virtual_mode(void) |
717 | { | |
718 | #ifdef CONFIG_KEXEC | |
719 | efi_memory_desc_t *md; | |
720 | void *p; | |
721 | ||
722 | efi.systab = NULL; | |
723 | ||
724 | /* | |
725 | * We don't do virtual mode, since we don't do runtime services, on | |
726 | * non-native EFI | |
727 | */ | |
728 | if (!efi_is_native()) { | |
729 | efi_unmap_memmap(); | |
a5a750a9 | 730 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 BP |
731 | return; |
732 | } | |
733 | ||
734 | /* | |
735 | * Map efi regions which were passed via setup_data. The virt_addr is a | |
736 | * fixed addr which was used in first kernel of a kexec boot. | |
737 | */ | |
738 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
739 | md = p; | |
740 | efi_map_region_fixed(md); /* FIXME: add error handling */ | |
741 | get_systab_virt_addr(md); | |
742 | } | |
743 | ||
744 | save_runtime_map(); | |
745 | ||
746 | BUG_ON(!efi.systab); | |
747 | ||
748 | efi_sync_low_kernel_mappings(); | |
749 | ||
750 | /* | |
751 | * Now that EFI is in virtual mode, update the function | |
752 | * pointers in the runtime service table to the new virtual addresses. | |
753 | * | |
754 | * Call EFI services through wrapper functions. | |
755 | */ | |
756 | efi.runtime_version = efi_systab.hdr.revision; | |
994448f1 | 757 | |
022ee6c5 | 758 | efi_native_runtime_setup(); |
994448f1 | 759 | |
fabb37c7 | 760 | efi.set_virtual_address_map = NULL; |
fabb37c7 BP |
761 | |
762 | if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX)) | |
763 | runtime_code_page_mkexec(); | |
764 | ||
765 | /* clean DUMMY object */ | |
eeb9db09 | 766 | efi_delete_dummy_variable(); |
fabb37c7 BP |
767 | #endif |
768 | } | |
769 | ||
481f75c0 DY |
770 | /* |
771 | * This function will switch the EFI runtime services to virtual mode. | |
772 | * Essentially, we look through the EFI memmap and map every region that | |
773 | * has the runtime attribute bit set in its memory descriptor into the | |
774 | * ->trampoline_pgd page table using a top-down VA allocation scheme. | |
775 | * | |
776 | * The old method which used to update that memory descriptor with the | |
777 | * virtual address obtained from ioremap() is still supported when the | |
778 | * kernel is booted with efi=old_map on its command line. Same old | |
779 | * method enabled the runtime services to be called without having to | |
780 | * thunk back into physical mode for every invocation. | |
781 | * | |
782 | * The new method does a pagetable switch in a preemption-safe manner | |
783 | * so that we're in a different address space when calling a runtime | |
784 | * function. For function arguments passing we do copy the PGDs of the | |
785 | * kernel page table into ->trampoline_pgd prior to each call. | |
1fec0533 DY |
786 | * |
787 | * Specially for kexec boot, efi runtime maps in previous kernel should | |
788 | * be passed in via setup_data. In that case runtime ranges will be mapped | |
fabb37c7 BP |
789 | * to the same virtual addresses as the first kernel, see |
790 | * kexec_enter_virtual_mode(). | |
481f75c0 | 791 | */ |
fabb37c7 | 792 | static void __init __efi_enter_virtual_mode(void) |
481f75c0 | 793 | { |
fabb37c7 | 794 | int count = 0, pg_shift = 0; |
481f75c0 | 795 | void *new_memmap = NULL; |
b7b898ae | 796 | efi_status_t status; |
1c083eb2 | 797 | |
481f75c0 | 798 | efi.systab = NULL; |
d2f7cbe7 | 799 | |
fabb37c7 BP |
800 | efi_merge_regions(); |
801 | new_memmap = efi_map_regions(&count, &pg_shift); | |
802 | if (!new_memmap) { | |
803 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); | |
a5a750a9 | 804 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 | 805 | return; |
b7b898ae | 806 | } |
926172d4 | 807 | |
fabb37c7 BP |
808 | save_runtime_map(); |
809 | ||
5b83683f HY |
810 | BUG_ON(!efi.systab); |
811 | ||
a5a750a9 DY |
812 | if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) { |
813 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
fabb37c7 | 814 | return; |
a5a750a9 | 815 | } |
b7b898ae | 816 | |
d2f7cbe7 | 817 | efi_sync_low_kernel_mappings(); |
11cc8512 | 818 | efi_dump_pagetable(); |
d2f7cbe7 | 819 | |
994448f1 MF |
820 | if (efi_is_native()) { |
821 | status = phys_efi_set_virtual_address_map( | |
822 | memmap.desc_size * count, | |
823 | memmap.desc_size, | |
824 | memmap.desc_version, | |
825 | (efi_memory_desc_t *)__pa(new_memmap)); | |
826 | } else { | |
827 | status = efi_thunk_set_virtual_address_map( | |
828 | efi_phys.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 | } | |
1fec0533 | 834 | |
fabb37c7 BP |
835 | if (status != EFI_SUCCESS) { |
836 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", | |
837 | status); | |
838 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
5b83683f HY |
839 | } |
840 | ||
841 | /* | |
842 | * Now that EFI is in virtual mode, update the function | |
843 | * pointers in the runtime service table to the new virtual addresses. | |
844 | * | |
845 | * Call EFI services through wrapper functions. | |
846 | */ | |
712ba9e9 | 847 | efi.runtime_version = efi_systab.hdr.revision; |
4f9dbcfc MF |
848 | |
849 | if (efi_is_native()) | |
022ee6c5 | 850 | efi_native_runtime_setup(); |
4f9dbcfc MF |
851 | else |
852 | efi_thunk_runtime_setup(); | |
853 | ||
2b5e8ef3 | 854 | efi.set_virtual_address_map = NULL; |
d2f7cbe7 | 855 | |
c55d016f | 856 | efi_runtime_mkexec(); |
1adbfa35 | 857 | |
b7b898ae BP |
858 | /* |
859 | * We mapped the descriptor array into the EFI pagetable above but we're | |
860 | * not unmapping it here. Here's why: | |
861 | * | |
862 | * We're copying select PGDs from the kernel page table to the EFI page | |
863 | * table and when we do so and make changes to those PGDs like unmapping | |
864 | * stuff from them, those changes appear in the kernel page table and we | |
865 | * go boom. | |
866 | * | |
867 | * From setup_real_mode(): | |
868 | * | |
869 | * ... | |
870 | * trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd; | |
871 | * | |
872 | * In this particular case, our allocation is in PGD 0 of the EFI page | |
873 | * table but we've copied that PGD from PGD[272] of the EFI page table: | |
874 | * | |
875 | * pgd_index(__PAGE_OFFSET = 0xffff880000000000) = 272 | |
876 | * | |
877 | * where the direct memory mapping in kernel space is. | |
878 | * | |
879 | * new_memmap's VA comes from that direct mapping and thus clearing it, | |
880 | * it would get cleared in the kernel page table too. | |
881 | * | |
882 | * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift); | |
883 | */ | |
fabb37c7 | 884 | free_pages((unsigned long)new_memmap, pg_shift); |
f8b84043 MG |
885 | |
886 | /* clean DUMMY object */ | |
eeb9db09 | 887 | efi_delete_dummy_variable(); |
5b83683f HY |
888 | } |
889 | ||
fabb37c7 BP |
890 | void __init efi_enter_virtual_mode(void) |
891 | { | |
9f27bc54 DK |
892 | if (efi_enabled(EFI_PARAVIRT)) |
893 | return; | |
894 | ||
fabb37c7 BP |
895 | if (efi_setup) |
896 | kexec_enter_virtual_mode(); | |
897 | else | |
898 | __efi_enter_virtual_mode(); | |
899 | } | |
900 | ||
5b83683f HY |
901 | /* |
902 | * Convenience functions to obtain memory types and attributes | |
903 | */ | |
904 | u32 efi_mem_type(unsigned long phys_addr) | |
905 | { | |
906 | efi_memory_desc_t *md; | |
907 | void *p; | |
908 | ||
83e68189 MF |
909 | if (!efi_enabled(EFI_MEMMAP)) |
910 | return 0; | |
911 | ||
5b83683f HY |
912 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
913 | md = p; | |
914 | if ((md->phys_addr <= phys_addr) && | |
915 | (phys_addr < (md->phys_addr + | |
916 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
917 | return md->type; | |
918 | } | |
919 | return 0; | |
920 | } | |
921 | ||
922 | u64 efi_mem_attributes(unsigned long phys_addr) | |
923 | { | |
924 | efi_memory_desc_t *md; | |
925 | void *p; | |
926 | ||
67a9b9c5 DK |
927 | if (!efi_enabled(EFI_MEMMAP)) |
928 | return 0; | |
929 | ||
5b83683f HY |
930 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
931 | md = p; | |
932 | if ((md->phys_addr <= phys_addr) && | |
933 | (phys_addr < (md->phys_addr + | |
934 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
935 | return md->attribute; | |
936 | } | |
937 | return 0; | |
938 | } | |
a6e4d5a0 | 939 | |
5ae3683c | 940 | static int __init arch_parse_efi_cmdline(char *str) |
d2f7cbe7 | 941 | { |
6ccc72b8 DY |
942 | if (parse_option_str(str, "old_map")) |
943 | set_bit(EFI_OLD_MEMMAP, &efi.flags); | |
d2f7cbe7 BP |
944 | |
945 | return 0; | |
946 | } | |
5ae3683c | 947 | early_param("efi", arch_parse_efi_cmdline); |