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 | |
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; |
5b83683f | 89 | |
4e78eb05 | 90 | efi_call_phys_prolog(); |
23a0d4e8 IM |
91 | |
92 | /* Disable interrupts around EFI calls: */ | |
93 | local_irq_save(flags); | |
62fa6e69 MF |
94 | status = efi_call_phys(efi_phys.set_virtual_address_map, |
95 | memory_map_size, descriptor_size, | |
96 | descriptor_version, virtual_map); | |
23a0d4e8 IM |
97 | local_irq_restore(flags); |
98 | ||
5b83683f | 99 | efi_call_phys_epilog(); |
23a0d4e8 | 100 | |
5b83683f HY |
101 | return status; |
102 | } | |
103 | ||
3565184e | 104 | void efi_get_time(struct timespec *now) |
5b83683f HY |
105 | { |
106 | efi_status_t status; | |
107 | efi_time_t eft; | |
108 | efi_time_cap_t cap; | |
109 | ||
110 | status = efi.get_time(&eft, &cap); | |
111 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 112 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f | 113 | |
3565184e DV |
114 | now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour, |
115 | eft.minute, eft.second); | |
116 | now->tv_nsec = 0; | |
5b83683f HY |
117 | } |
118 | ||
69c91893 PJ |
119 | /* |
120 | * Tell the kernel about the EFI memory map. This might include | |
121 | * more than the max 128 entries that can fit in the e820 legacy | |
122 | * (zeropage) memory map. | |
123 | */ | |
124 | ||
200001eb | 125 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
126 | { |
127 | void *p; | |
128 | ||
129 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
130 | efi_memory_desc_t *md = p; | |
131 | unsigned long long start = md->phys_addr; | |
132 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
133 | int e820_type; | |
134 | ||
e2a71476 CW |
135 | switch (md->type) { |
136 | case EFI_LOADER_CODE: | |
137 | case EFI_LOADER_DATA: | |
138 | case EFI_BOOT_SERVICES_CODE: | |
139 | case EFI_BOOT_SERVICES_DATA: | |
140 | case EFI_CONVENTIONAL_MEMORY: | |
141 | if (md->attribute & EFI_MEMORY_WB) | |
142 | e820_type = E820_RAM; | |
143 | else | |
144 | e820_type = E820_RESERVED; | |
145 | break; | |
146 | case EFI_ACPI_RECLAIM_MEMORY: | |
147 | e820_type = E820_ACPI; | |
148 | break; | |
149 | case EFI_ACPI_MEMORY_NVS: | |
150 | e820_type = E820_NVS; | |
151 | break; | |
152 | case EFI_UNUSABLE_MEMORY: | |
153 | e820_type = E820_UNUSABLE; | |
154 | break; | |
155 | default: | |
156 | /* | |
157 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
158 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
159 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
160 | */ | |
69c91893 | 161 | e820_type = E820_RESERVED; |
e2a71476 CW |
162 | break; |
163 | } | |
d0be6bde | 164 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
165 | } |
166 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
167 | } | |
168 | ||
1adbfa35 | 169 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 170 | { |
15b9c359 | 171 | struct efi_info *e = &boot_params.efi_info; |
ecacf09f HY |
172 | unsigned long pmap; |
173 | ||
9f27bc54 DK |
174 | if (efi_enabled(EFI_PARAVIRT)) |
175 | return 0; | |
176 | ||
05486fa7 | 177 | #ifdef CONFIG_X86_32 |
1adbfa35 | 178 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 179 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
180 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
181 | return -EINVAL; | |
182 | } | |
15b9c359 | 183 | pmap = e->efi_memmap; |
05486fa7 | 184 | #else |
15b9c359 | 185 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 186 | #endif |
15b9c359 BP |
187 | memmap.phys_map = (void *)pmap; |
188 | memmap.nr_map = e->efi_memmap_size / | |
189 | e->efi_memdesc_size; | |
190 | memmap.desc_size = e->efi_memdesc_size; | |
191 | memmap.desc_version = e->efi_memdesc_version; | |
192 | ||
24aa0788 | 193 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
1adbfa35 | 194 | |
258f6fd7 LL |
195 | efi.memmap = &memmap; |
196 | ||
1adbfa35 | 197 | return 0; |
ecacf09f HY |
198 | } |
199 | ||
5b83683f HY |
200 | static void __init print_efi_memmap(void) |
201 | { | |
f4fccac0 | 202 | #ifdef EFI_DEBUG |
5b83683f HY |
203 | efi_memory_desc_t *md; |
204 | void *p; | |
205 | int i; | |
206 | ||
207 | for (p = memmap.map, i = 0; | |
208 | p < memmap.map_end; | |
209 | p += memmap.desc_size, i++) { | |
ace1d121 LE |
210 | char buf[64]; |
211 | ||
5b83683f | 212 | md = p; |
ace1d121 LE |
213 | pr_info("mem%02u: %s range=[0x%016llx-0x%016llx) (%lluMB)\n", |
214 | i, efi_md_typeattr_format(buf, sizeof(buf), md), | |
215 | md->phys_addr, | |
5b83683f HY |
216 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), |
217 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
218 | } | |
5b83683f | 219 | #endif /* EFI_DEBUG */ |
f4fccac0 | 220 | } |
5b83683f | 221 | |
5189c2a7 | 222 | void __init efi_unmap_memmap(void) |
78510792 | 223 | { |
3e909599 | 224 | clear_bit(EFI_MEMMAP, &efi.flags); |
78510792 | 225 | if (memmap.map) { |
abc93f8e | 226 | early_memunmap(memmap.map, memmap.nr_map * memmap.desc_size); |
78510792 JT |
227 | memmap.map = NULL; |
228 | } | |
229 | } | |
230 | ||
140bf275 | 231 | static int __init efi_systab_init(void *phys) |
5b83683f | 232 | { |
83e68189 | 233 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 | 234 | efi_system_table_64_t *systab64; |
1fec0533 | 235 | struct efi_setup_data *data = NULL; |
1adbfa35 OJ |
236 | u64 tmp = 0; |
237 | ||
1fec0533 DY |
238 | if (efi_setup) { |
239 | data = early_memremap(efi_setup, sizeof(*data)); | |
240 | if (!data) | |
241 | return -ENOMEM; | |
242 | } | |
abc93f8e | 243 | systab64 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
244 | sizeof(*systab64)); |
245 | if (systab64 == NULL) { | |
246 | pr_err("Couldn't map the system table!\n"); | |
1fec0533 | 247 | if (data) |
abc93f8e | 248 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
249 | return -ENOMEM; |
250 | } | |
251 | ||
252 | efi_systab.hdr = systab64->hdr; | |
1fec0533 DY |
253 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
254 | systab64->fw_vendor; | |
255 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; | |
1adbfa35 OJ |
256 | efi_systab.fw_revision = systab64->fw_revision; |
257 | efi_systab.con_in_handle = systab64->con_in_handle; | |
258 | tmp |= systab64->con_in_handle; | |
259 | efi_systab.con_in = systab64->con_in; | |
260 | tmp |= systab64->con_in; | |
261 | efi_systab.con_out_handle = systab64->con_out_handle; | |
262 | tmp |= systab64->con_out_handle; | |
263 | efi_systab.con_out = systab64->con_out; | |
264 | tmp |= systab64->con_out; | |
265 | efi_systab.stderr_handle = systab64->stderr_handle; | |
266 | tmp |= systab64->stderr_handle; | |
267 | efi_systab.stderr = systab64->stderr; | |
268 | tmp |= systab64->stderr; | |
1fec0533 DY |
269 | efi_systab.runtime = data ? |
270 | (void *)(unsigned long)data->runtime : | |
271 | (void *)(unsigned long)systab64->runtime; | |
272 | tmp |= data ? data->runtime : systab64->runtime; | |
1adbfa35 OJ |
273 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
274 | tmp |= systab64->boottime; | |
275 | efi_systab.nr_tables = systab64->nr_tables; | |
1fec0533 DY |
276 | efi_systab.tables = data ? (unsigned long)data->tables : |
277 | systab64->tables; | |
278 | tmp |= data ? data->tables : systab64->tables; | |
1adbfa35 | 279 | |
abc93f8e | 280 | early_memunmap(systab64, sizeof(*systab64)); |
1fec0533 | 281 | if (data) |
abc93f8e | 282 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
283 | #ifdef CONFIG_X86_32 |
284 | if (tmp >> 32) { | |
285 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
286 | return -EINVAL; | |
287 | } | |
288 | #endif | |
289 | } else { | |
290 | efi_system_table_32_t *systab32; | |
291 | ||
abc93f8e | 292 | systab32 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
293 | sizeof(*systab32)); |
294 | if (systab32 == NULL) { | |
295 | pr_err("Couldn't map the system table!\n"); | |
296 | return -ENOMEM; | |
297 | } | |
298 | ||
299 | efi_systab.hdr = systab32->hdr; | |
300 | efi_systab.fw_vendor = systab32->fw_vendor; | |
301 | efi_systab.fw_revision = systab32->fw_revision; | |
302 | efi_systab.con_in_handle = systab32->con_in_handle; | |
303 | efi_systab.con_in = systab32->con_in; | |
304 | efi_systab.con_out_handle = systab32->con_out_handle; | |
305 | efi_systab.con_out = systab32->con_out; | |
306 | efi_systab.stderr_handle = systab32->stderr_handle; | |
307 | efi_systab.stderr = systab32->stderr; | |
308 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
309 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
310 | efi_systab.nr_tables = systab32->nr_tables; | |
311 | efi_systab.tables = systab32->tables; | |
312 | ||
abc93f8e | 313 | early_memunmap(systab32, sizeof(*systab32)); |
140bf275 | 314 | } |
1adbfa35 | 315 | |
5b83683f HY |
316 | efi.systab = &efi_systab; |
317 | ||
318 | /* | |
319 | * Verify the EFI Table | |
320 | */ | |
140bf275 | 321 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 322 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
323 | return -EINVAL; |
324 | } | |
5b83683f | 325 | if ((efi.systab->hdr.revision >> 16) == 0) |
9b7d2049 | 326 | pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n", |
5b83683f HY |
327 | efi.systab->hdr.revision >> 16, |
328 | efi.systab->hdr.revision & 0xffff); | |
140bf275 | 329 | |
0f8093a9 MF |
330 | set_bit(EFI_SYSTEM_TABLES, &efi.flags); |
331 | ||
140bf275 | 332 | return 0; |
83e7ee66 | 333 | } |
5b83683f | 334 | |
4f9dbcfc | 335 | static int __init efi_runtime_init32(void) |
83e7ee66 | 336 | { |
4f9dbcfc MF |
337 | efi_runtime_services_32_t *runtime; |
338 | ||
abc93f8e | 339 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc MF |
340 | sizeof(efi_runtime_services_32_t)); |
341 | if (!runtime) { | |
342 | pr_err("Could not map the runtime service table!\n"); | |
343 | return -ENOMEM; | |
344 | } | |
5b83683f HY |
345 | |
346 | /* | |
0ce4605c MK |
347 | * We will only need *early* access to the SetVirtualAddressMap |
348 | * EFI runtime service. All other runtime services will be called | |
349 | * via the virtual mapping. | |
5b83683f | 350 | */ |
4f9dbcfc MF |
351 | efi_phys.set_virtual_address_map = |
352 | (efi_set_virtual_address_map_t *) | |
353 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 354 | early_memunmap(runtime, sizeof(efi_runtime_services_32_t)); |
4f9dbcfc MF |
355 | |
356 | return 0; | |
357 | } | |
358 | ||
359 | static int __init efi_runtime_init64(void) | |
360 | { | |
361 | efi_runtime_services_64_t *runtime; | |
362 | ||
abc93f8e | 363 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc | 364 | sizeof(efi_runtime_services_64_t)); |
140bf275 | 365 | if (!runtime) { |
e3cb3f5a | 366 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
367 | return -ENOMEM; |
368 | } | |
4f9dbcfc | 369 | |
140bf275 | 370 | /* |
0ce4605c MK |
371 | * We will only need *early* access to the SetVirtualAddressMap |
372 | * EFI runtime service. All other runtime services will be called | |
373 | * via the virtual mapping. | |
140bf275 | 374 | */ |
140bf275 | 375 | efi_phys.set_virtual_address_map = |
4f9dbcfc MF |
376 | (efi_set_virtual_address_map_t *) |
377 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 378 | early_memunmap(runtime, sizeof(efi_runtime_services_64_t)); |
4f9dbcfc MF |
379 | |
380 | return 0; | |
381 | } | |
382 | ||
383 | static int __init efi_runtime_init(void) | |
384 | { | |
385 | int rv; | |
386 | ||
387 | /* | |
388 | * Check out the runtime services table. We need to map | |
389 | * the runtime services table so that we can grab the physical | |
390 | * address of several of the EFI runtime functions, needed to | |
391 | * set the firmware into virtual mode. | |
9f27bc54 DK |
392 | * |
393 | * When EFI_PARAVIRT is in force then we could not map runtime | |
394 | * service memory region because we do not have direct access to it. | |
395 | * However, runtime services are available through proxy functions | |
396 | * (e.g. in case of Xen dom0 EFI implementation they call special | |
397 | * hypercall which executes relevant EFI functions) and that is why | |
398 | * they are always enabled. | |
4f9dbcfc | 399 | */ |
4f9dbcfc | 400 | |
9f27bc54 DK |
401 | if (!efi_enabled(EFI_PARAVIRT)) { |
402 | if (efi_enabled(EFI_64BIT)) | |
403 | rv = efi_runtime_init64(); | |
404 | else | |
405 | rv = efi_runtime_init32(); | |
406 | ||
407 | if (rv) | |
408 | return rv; | |
409 | } | |
140bf275 | 410 | |
0f8093a9 MF |
411 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
412 | ||
140bf275 | 413 | return 0; |
83e7ee66 | 414 | } |
5b83683f | 415 | |
140bf275 | 416 | static int __init efi_memmap_init(void) |
83e7ee66 | 417 | { |
9f27bc54 DK |
418 | if (efi_enabled(EFI_PARAVIRT)) |
419 | return 0; | |
420 | ||
5b83683f | 421 | /* Map the EFI memory map */ |
abc93f8e | 422 | memmap.map = early_memremap((unsigned long)memmap.phys_map, |
beacfaac | 423 | memmap.nr_map * memmap.desc_size); |
140bf275 | 424 | if (memmap.map == NULL) { |
e3cb3f5a | 425 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
426 | return -ENOMEM; |
427 | } | |
5b83683f | 428 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 429 | |
200001eb PJ |
430 | if (add_efi_memmap) |
431 | do_add_efi_memmap(); | |
140bf275 | 432 | |
0f8093a9 MF |
433 | set_bit(EFI_MEMMAP, &efi.flags); |
434 | ||
140bf275 | 435 | return 0; |
83e7ee66 OJ |
436 | } |
437 | ||
438 | void __init efi_init(void) | |
439 | { | |
440 | efi_char16_t *c16; | |
441 | char vendor[100] = "unknown"; | |
442 | int i = 0; | |
443 | void *tmp; | |
444 | ||
445 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
446 | if (boot_params.efi_info.efi_systab_hi || |
447 | boot_params.efi_info.efi_memmap_hi) { | |
448 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
449 | return; |
450 | } | |
83e7ee66 OJ |
451 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
452 | #else | |
453 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
454 | (boot_params.efi_info.efi_systab | |
455 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
456 | #endif |
457 | ||
83e68189 | 458 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 459 | return; |
83e68189 | 460 | |
a0998eb1 DY |
461 | efi.config_table = (unsigned long)efi.systab->tables; |
462 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; | |
463 | efi.runtime = (unsigned long)efi.systab->runtime; | |
464 | ||
83e7ee66 OJ |
465 | /* |
466 | * Show what we know for posterity | |
467 | */ | |
abc93f8e | 468 | c16 = tmp = early_memremap(efi.systab->fw_vendor, 2); |
83e7ee66 OJ |
469 | if (c16) { |
470 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
471 | vendor[i] = *c16++; | |
472 | vendor[i] = '\0'; | |
473 | } else | |
e3cb3f5a | 474 | pr_err("Could not map the firmware vendor!\n"); |
abc93f8e | 475 | early_memunmap(tmp, 2); |
83e7ee66 | 476 | |
e3cb3f5a OJ |
477 | pr_info("EFI v%u.%.02u by %s\n", |
478 | efi.systab->hdr.revision >> 16, | |
479 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 480 | |
1fec0533 DY |
481 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
482 | return; | |
483 | ||
272686bf | 484 | if (efi_config_init(arch_tables)) |
140bf275 | 485 | return; |
83e68189 | 486 | |
1adbfa35 OJ |
487 | /* |
488 | * Note: We currently don't support runtime services on an EFI | |
489 | * that doesn't match the kernel 32/64-bit mode. | |
490 | */ | |
491 | ||
7d453eee | 492 | if (!efi_runtime_supported()) |
1adbfa35 | 493 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 494 | else { |
b2e0a54a | 495 | if (efi_runtime_disabled() || efi_runtime_init()) |
83e68189 | 496 | return; |
140bf275 | 497 | } |
83e68189 | 498 | if (efi_memmap_init()) |
140bf275 | 499 | return; |
83e68189 | 500 | |
fed6cefe BP |
501 | if (efi_enabled(EFI_DBG)) |
502 | print_efi_memmap(); | |
5b83683f HY |
503 | } |
504 | ||
2223af38 JT |
505 | void __init efi_late_init(void) |
506 | { | |
507 | efi_bgrt_init(); | |
508 | } | |
509 | ||
9cd2b07c MG |
510 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
511 | { | |
512 | u64 addr, npages; | |
513 | ||
514 | addr = md->virt_addr; | |
515 | npages = md->num_pages; | |
516 | ||
517 | memrange_efi_to_native(&addr, &npages); | |
518 | ||
519 | if (executable) | |
520 | set_memory_x(addr, npages); | |
521 | else | |
522 | set_memory_nx(addr, npages); | |
523 | } | |
524 | ||
c55d016f | 525 | void __init runtime_code_page_mkexec(void) |
a2172e25 HY |
526 | { |
527 | efi_memory_desc_t *md; | |
a2172e25 HY |
528 | void *p; |
529 | ||
a2172e25 HY |
530 | /* Make EFI runtime service code area executable */ |
531 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
532 | md = p; | |
1c083eb2 HY |
533 | |
534 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
535 | continue; | |
536 | ||
9cd2b07c | 537 | efi_set_executable(md, true); |
a2172e25 | 538 | } |
a2172e25 | 539 | } |
a2172e25 | 540 | |
4e78eb05 | 541 | void __init efi_memory_uc(u64 addr, unsigned long size) |
3e8fa263 MF |
542 | { |
543 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
544 | u64 npages; | |
545 | ||
546 | npages = round_up(size, page_shift) / page_shift; | |
547 | memrange_efi_to_native(&addr, &npages); | |
548 | set_memory_uc(addr, npages); | |
549 | } | |
550 | ||
d2f7cbe7 BP |
551 | void __init old_map_region(efi_memory_desc_t *md) |
552 | { | |
553 | u64 start_pfn, end_pfn, end; | |
554 | unsigned long size; | |
555 | void *va; | |
556 | ||
557 | start_pfn = PFN_DOWN(md->phys_addr); | |
558 | size = md->num_pages << PAGE_SHIFT; | |
559 | end = md->phys_addr + size; | |
560 | end_pfn = PFN_UP(end); | |
561 | ||
562 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { | |
563 | va = __va(md->phys_addr); | |
564 | ||
565 | if (!(md->attribute & EFI_MEMORY_WB)) | |
566 | efi_memory_uc((u64)(unsigned long)va, size); | |
567 | } else | |
568 | va = efi_ioremap(md->phys_addr, size, | |
569 | md->type, md->attribute); | |
570 | ||
571 | md->virt_addr = (u64) (unsigned long) va; | |
572 | if (!va) | |
573 | pr_err("ioremap of 0x%llX failed!\n", | |
574 | (unsigned long long)md->phys_addr); | |
575 | } | |
576 | ||
481f75c0 DY |
577 | /* Merge contiguous regions of the same type and attribute */ |
578 | static void __init efi_merge_regions(void) | |
5b83683f | 579 | { |
481f75c0 | 580 | void *p; |
202f9d0a | 581 | efi_memory_desc_t *md, *prev_md = NULL; |
202f9d0a | 582 | |
202f9d0a MG |
583 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
584 | u64 prev_size; | |
585 | md = p; | |
586 | ||
587 | if (!prev_md) { | |
588 | prev_md = md; | |
589 | continue; | |
590 | } | |
591 | ||
592 | if (prev_md->type != md->type || | |
593 | prev_md->attribute != md->attribute) { | |
594 | prev_md = md; | |
595 | continue; | |
596 | } | |
597 | ||
598 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
599 | ||
600 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
601 | prev_md->num_pages += md->num_pages; | |
602 | md->type = EFI_RESERVED_TYPE; | |
603 | md->attribute = 0; | |
604 | continue; | |
605 | } | |
606 | prev_md = md; | |
481f75c0 DY |
607 | } |
608 | } | |
609 | ||
610 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) | |
611 | { | |
612 | unsigned long size; | |
613 | u64 end, systab; | |
d2f7cbe7 | 614 | |
481f75c0 DY |
615 | size = md->num_pages << EFI_PAGE_SHIFT; |
616 | end = md->phys_addr + size; | |
617 | systab = (u64)(unsigned long)efi_phys.systab; | |
618 | if (md->phys_addr <= systab && systab < end) { | |
619 | systab += md->virt_addr - md->phys_addr; | |
620 | efi.systab = (efi_system_table_t *)(unsigned long)systab; | |
202f9d0a | 621 | } |
481f75c0 DY |
622 | } |
623 | ||
fabb37c7 | 624 | static void __init save_runtime_map(void) |
926172d4 | 625 | { |
fabb37c7 | 626 | #ifdef CONFIG_KEXEC |
926172d4 DY |
627 | efi_memory_desc_t *md; |
628 | void *tmp, *p, *q = NULL; | |
629 | int count = 0; | |
630 | ||
a3530e8f DY |
631 | if (efi_enabled(EFI_OLD_MEMMAP)) |
632 | return; | |
633 | ||
926172d4 DY |
634 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
635 | md = p; | |
636 | ||
637 | if (!(md->attribute & EFI_MEMORY_RUNTIME) || | |
638 | (md->type == EFI_BOOT_SERVICES_CODE) || | |
639 | (md->type == EFI_BOOT_SERVICES_DATA)) | |
640 | continue; | |
641 | tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL); | |
642 | if (!tmp) | |
643 | goto out; | |
644 | q = tmp; | |
645 | ||
646 | memcpy(q + count * memmap.desc_size, md, memmap.desc_size); | |
647 | count++; | |
648 | } | |
649 | ||
518548ab | 650 | efi_runtime_map_setup(q, count, memmap.desc_size); |
fabb37c7 | 651 | return; |
926172d4 | 652 | |
926172d4 DY |
653 | out: |
654 | kfree(q); | |
fabb37c7 BP |
655 | pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n"); |
656 | #endif | |
1fec0533 DY |
657 | } |
658 | ||
b7b898ae BP |
659 | static void *realloc_pages(void *old_memmap, int old_shift) |
660 | { | |
661 | void *ret; | |
662 | ||
663 | ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1); | |
664 | if (!ret) | |
665 | goto out; | |
666 | ||
667 | /* | |
668 | * A first-time allocation doesn't have anything to copy. | |
669 | */ | |
670 | if (!old_memmap) | |
671 | return ret; | |
672 | ||
673 | memcpy(ret, old_memmap, PAGE_SIZE << old_shift); | |
674 | ||
675 | out: | |
676 | free_pages((unsigned long)old_memmap, old_shift); | |
677 | return ret; | |
678 | } | |
679 | ||
481f75c0 | 680 | /* |
b7b898ae BP |
681 | * Map the efi memory ranges of the runtime services and update new_mmap with |
682 | * virtual addresses. | |
481f75c0 | 683 | */ |
b7b898ae | 684 | static void * __init efi_map_regions(int *count, int *pg_shift) |
481f75c0 | 685 | { |
b7b898ae BP |
686 | void *p, *new_memmap = NULL; |
687 | unsigned long left = 0; | |
481f75c0 | 688 | efi_memory_desc_t *md; |
202f9d0a | 689 | |
5b83683f HY |
690 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
691 | md = p; | |
70087011 JB |
692 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) { |
693 | #ifdef CONFIG_X86_64 | |
694 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
695 | md->type != EFI_BOOT_SERVICES_DATA) | |
696 | #endif | |
697 | continue; | |
698 | } | |
1c083eb2 | 699 | |
d2f7cbe7 | 700 | efi_map_region(md); |
481f75c0 DY |
701 | get_systab_virt_addr(md); |
702 | ||
b7b898ae BP |
703 | if (left < memmap.desc_size) { |
704 | new_memmap = realloc_pages(new_memmap, *pg_shift); | |
705 | if (!new_memmap) | |
706 | return NULL; | |
707 | ||
708 | left += PAGE_SIZE << *pg_shift; | |
709 | (*pg_shift)++; | |
710 | } | |
711 | ||
481f75c0 DY |
712 | memcpy(new_memmap + (*count * memmap.desc_size), md, |
713 | memmap.desc_size); | |
b7b898ae BP |
714 | |
715 | left -= memmap.desc_size; | |
481f75c0 DY |
716 | (*count)++; |
717 | } | |
d2f7cbe7 | 718 | |
481f75c0 | 719 | return new_memmap; |
481f75c0 DY |
720 | } |
721 | ||
fabb37c7 BP |
722 | static void __init kexec_enter_virtual_mode(void) |
723 | { | |
724 | #ifdef CONFIG_KEXEC | |
725 | efi_memory_desc_t *md; | |
726 | void *p; | |
727 | ||
728 | efi.systab = NULL; | |
729 | ||
730 | /* | |
731 | * We don't do virtual mode, since we don't do runtime services, on | |
732 | * non-native EFI | |
733 | */ | |
734 | if (!efi_is_native()) { | |
735 | efi_unmap_memmap(); | |
a5a750a9 | 736 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 BP |
737 | return; |
738 | } | |
739 | ||
740 | /* | |
741 | * Map efi regions which were passed via setup_data. The virt_addr is a | |
742 | * fixed addr which was used in first kernel of a kexec boot. | |
743 | */ | |
744 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
745 | md = p; | |
746 | efi_map_region_fixed(md); /* FIXME: add error handling */ | |
747 | get_systab_virt_addr(md); | |
748 | } | |
749 | ||
750 | save_runtime_map(); | |
751 | ||
752 | BUG_ON(!efi.systab); | |
753 | ||
754 | efi_sync_low_kernel_mappings(); | |
755 | ||
756 | /* | |
757 | * Now that EFI is in virtual mode, update the function | |
758 | * pointers in the runtime service table to the new virtual addresses. | |
759 | * | |
760 | * Call EFI services through wrapper functions. | |
761 | */ | |
762 | efi.runtime_version = efi_systab.hdr.revision; | |
994448f1 | 763 | |
022ee6c5 | 764 | efi_native_runtime_setup(); |
994448f1 | 765 | |
fabb37c7 | 766 | efi.set_virtual_address_map = NULL; |
fabb37c7 BP |
767 | |
768 | if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX)) | |
769 | runtime_code_page_mkexec(); | |
770 | ||
771 | /* clean DUMMY object */ | |
eeb9db09 | 772 | efi_delete_dummy_variable(); |
fabb37c7 BP |
773 | #endif |
774 | } | |
775 | ||
481f75c0 DY |
776 | /* |
777 | * This function will switch the EFI runtime services to virtual mode. | |
778 | * Essentially, we look through the EFI memmap and map every region that | |
779 | * has the runtime attribute bit set in its memory descriptor into the | |
780 | * ->trampoline_pgd page table using a top-down VA allocation scheme. | |
781 | * | |
782 | * The old method which used to update that memory descriptor with the | |
783 | * virtual address obtained from ioremap() is still supported when the | |
784 | * kernel is booted with efi=old_map on its command line. Same old | |
785 | * method enabled the runtime services to be called without having to | |
786 | * thunk back into physical mode for every invocation. | |
787 | * | |
788 | * The new method does a pagetable switch in a preemption-safe manner | |
789 | * so that we're in a different address space when calling a runtime | |
790 | * function. For function arguments passing we do copy the PGDs of the | |
791 | * kernel page table into ->trampoline_pgd prior to each call. | |
1fec0533 DY |
792 | * |
793 | * Specially for kexec boot, efi runtime maps in previous kernel should | |
794 | * be passed in via setup_data. In that case runtime ranges will be mapped | |
fabb37c7 BP |
795 | * to the same virtual addresses as the first kernel, see |
796 | * kexec_enter_virtual_mode(). | |
481f75c0 | 797 | */ |
fabb37c7 | 798 | static void __init __efi_enter_virtual_mode(void) |
481f75c0 | 799 | { |
fabb37c7 | 800 | int count = 0, pg_shift = 0; |
481f75c0 | 801 | void *new_memmap = NULL; |
b7b898ae | 802 | efi_status_t status; |
1c083eb2 | 803 | |
481f75c0 | 804 | efi.systab = NULL; |
d2f7cbe7 | 805 | |
fabb37c7 BP |
806 | efi_merge_regions(); |
807 | new_memmap = efi_map_regions(&count, &pg_shift); | |
808 | if (!new_memmap) { | |
809 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); | |
a5a750a9 | 810 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 | 811 | return; |
b7b898ae | 812 | } |
926172d4 | 813 | |
fabb37c7 BP |
814 | save_runtime_map(); |
815 | ||
5b83683f HY |
816 | BUG_ON(!efi.systab); |
817 | ||
a5a750a9 DY |
818 | if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) { |
819 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
fabb37c7 | 820 | return; |
a5a750a9 | 821 | } |
b7b898ae | 822 | |
d2f7cbe7 | 823 | efi_sync_low_kernel_mappings(); |
11cc8512 | 824 | efi_dump_pagetable(); |
d2f7cbe7 | 825 | |
994448f1 MF |
826 | if (efi_is_native()) { |
827 | status = phys_efi_set_virtual_address_map( | |
828 | memmap.desc_size * count, | |
829 | memmap.desc_size, | |
830 | memmap.desc_version, | |
831 | (efi_memory_desc_t *)__pa(new_memmap)); | |
832 | } else { | |
833 | status = efi_thunk_set_virtual_address_map( | |
834 | efi_phys.set_virtual_address_map, | |
835 | memmap.desc_size * count, | |
836 | memmap.desc_size, | |
837 | memmap.desc_version, | |
838 | (efi_memory_desc_t *)__pa(new_memmap)); | |
839 | } | |
1fec0533 | 840 | |
fabb37c7 BP |
841 | if (status != EFI_SUCCESS) { |
842 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", | |
843 | status); | |
844 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
5b83683f HY |
845 | } |
846 | ||
847 | /* | |
848 | * Now that EFI is in virtual mode, update the function | |
849 | * pointers in the runtime service table to the new virtual addresses. | |
850 | * | |
851 | * Call EFI services through wrapper functions. | |
852 | */ | |
712ba9e9 | 853 | efi.runtime_version = efi_systab.hdr.revision; |
4f9dbcfc MF |
854 | |
855 | if (efi_is_native()) | |
022ee6c5 | 856 | efi_native_runtime_setup(); |
4f9dbcfc MF |
857 | else |
858 | efi_thunk_runtime_setup(); | |
859 | ||
2b5e8ef3 | 860 | efi.set_virtual_address_map = NULL; |
d2f7cbe7 | 861 | |
c55d016f | 862 | efi_runtime_mkexec(); |
1adbfa35 | 863 | |
b7b898ae BP |
864 | /* |
865 | * We mapped the descriptor array into the EFI pagetable above but we're | |
866 | * not unmapping it here. Here's why: | |
867 | * | |
868 | * We're copying select PGDs from the kernel page table to the EFI page | |
869 | * table and when we do so and make changes to those PGDs like unmapping | |
870 | * stuff from them, those changes appear in the kernel page table and we | |
871 | * go boom. | |
872 | * | |
873 | * From setup_real_mode(): | |
874 | * | |
875 | * ... | |
876 | * trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd; | |
877 | * | |
878 | * In this particular case, our allocation is in PGD 0 of the EFI page | |
879 | * table but we've copied that PGD from PGD[272] of the EFI page table: | |
880 | * | |
881 | * pgd_index(__PAGE_OFFSET = 0xffff880000000000) = 272 | |
882 | * | |
883 | * where the direct memory mapping in kernel space is. | |
884 | * | |
885 | * new_memmap's VA comes from that direct mapping and thus clearing it, | |
886 | * it would get cleared in the kernel page table too. | |
887 | * | |
888 | * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift); | |
889 | */ | |
fabb37c7 | 890 | free_pages((unsigned long)new_memmap, pg_shift); |
f8b84043 MG |
891 | |
892 | /* clean DUMMY object */ | |
eeb9db09 | 893 | efi_delete_dummy_variable(); |
5b83683f HY |
894 | } |
895 | ||
fabb37c7 BP |
896 | void __init efi_enter_virtual_mode(void) |
897 | { | |
9f27bc54 DK |
898 | if (efi_enabled(EFI_PARAVIRT)) |
899 | return; | |
900 | ||
fabb37c7 BP |
901 | if (efi_setup) |
902 | kexec_enter_virtual_mode(); | |
903 | else | |
904 | __efi_enter_virtual_mode(); | |
905 | } | |
906 | ||
5b83683f HY |
907 | /* |
908 | * Convenience functions to obtain memory types and attributes | |
909 | */ | |
910 | u32 efi_mem_type(unsigned long phys_addr) | |
911 | { | |
912 | efi_memory_desc_t *md; | |
913 | void *p; | |
914 | ||
83e68189 MF |
915 | if (!efi_enabled(EFI_MEMMAP)) |
916 | return 0; | |
917 | ||
5b83683f HY |
918 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
919 | md = p; | |
920 | if ((md->phys_addr <= phys_addr) && | |
921 | (phys_addr < (md->phys_addr + | |
922 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
923 | return md->type; | |
924 | } | |
925 | return 0; | |
926 | } | |
927 | ||
928 | u64 efi_mem_attributes(unsigned long phys_addr) | |
929 | { | |
930 | efi_memory_desc_t *md; | |
931 | void *p; | |
932 | ||
67a9b9c5 DK |
933 | if (!efi_enabled(EFI_MEMMAP)) |
934 | return 0; | |
935 | ||
5b83683f HY |
936 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
937 | md = p; | |
938 | if ((md->phys_addr <= phys_addr) && | |
939 | (phys_addr < (md->phys_addr + | |
940 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
941 | return md->attribute; | |
942 | } | |
943 | return 0; | |
944 | } | |
a6e4d5a0 | 945 | |
5ae3683c | 946 | static int __init arch_parse_efi_cmdline(char *str) |
d2f7cbe7 | 947 | { |
6ccc72b8 DY |
948 | if (parse_option_str(str, "old_map")) |
949 | set_bit(EFI_OLD_MEMMAP, &efi.flags); | |
fed6cefe BP |
950 | if (parse_option_str(str, "debug")) |
951 | set_bit(EFI_DBG, &efi.flags); | |
d2f7cbe7 BP |
952 | |
953 | return 0; | |
954 | } | |
5ae3683c | 955 | early_param("efi", arch_parse_efi_cmdline); |