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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> |
a5d90c92 | 54 | #include <asm/uv/uv.h> |
5b83683f | 55 | |
ecaea42e | 56 | static struct efi efi_phys __initdata; |
5b83683f HY |
57 | static efi_system_table_t efi_systab __initdata; |
58 | ||
9b7d2049 | 59 | static efi_config_table_type_t arch_tables[] __initdata = { |
272686bf LL |
60 | #ifdef CONFIG_X86_UV |
61 | {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab}, | |
62 | #endif | |
722da9d2 | 63 | {NULL_GUID, NULL, NULL}, |
272686bf LL |
64 | }; |
65 | ||
1fec0533 | 66 | u64 efi_setup; /* efi setup_data physical address */ |
926172d4 | 67 | |
60920685 | 68 | static int add_efi_memmap __initdata; |
200001eb PJ |
69 | static int __init setup_add_efi_memmap(char *arg) |
70 | { | |
71 | add_efi_memmap = 1; | |
72 | return 0; | |
73 | } | |
74 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
75 | ||
5b83683f HY |
76 | static efi_status_t __init phys_efi_set_virtual_address_map( |
77 | unsigned long memory_map_size, | |
78 | unsigned long descriptor_size, | |
79 | u32 descriptor_version, | |
80 | efi_memory_desc_t *virtual_map) | |
81 | { | |
82 | efi_status_t status; | |
23a0d4e8 | 83 | unsigned long flags; |
744937b0 | 84 | pgd_t *save_pgd; |
5b83683f | 85 | |
744937b0 | 86 | save_pgd = efi_call_phys_prolog(); |
23a0d4e8 IM |
87 | |
88 | /* Disable interrupts around EFI calls: */ | |
89 | local_irq_save(flags); | |
62fa6e69 MF |
90 | status = efi_call_phys(efi_phys.set_virtual_address_map, |
91 | memory_map_size, descriptor_size, | |
92 | descriptor_version, virtual_map); | |
23a0d4e8 IM |
93 | local_irq_restore(flags); |
94 | ||
744937b0 | 95 | efi_call_phys_epilog(save_pgd); |
23a0d4e8 | 96 | |
5b83683f HY |
97 | return status; |
98 | } | |
99 | ||
b05b9f5f TL |
100 | void __init efi_find_mirror(void) |
101 | { | |
78ce248f | 102 | efi_memory_desc_t *md; |
b05b9f5f TL |
103 | u64 mirror_size = 0, total_size = 0; |
104 | ||
78ce248f | 105 | for_each_efi_memory_desc(md) { |
b05b9f5f TL |
106 | unsigned long long start = md->phys_addr; |
107 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
108 | ||
109 | total_size += size; | |
110 | if (md->attribute & EFI_MEMORY_MORE_RELIABLE) { | |
111 | memblock_mark_mirror(start, size); | |
112 | mirror_size += size; | |
113 | } | |
114 | } | |
115 | if (mirror_size) | |
116 | pr_info("Memory: %lldM/%lldM mirrored memory\n", | |
117 | mirror_size>>20, total_size>>20); | |
118 | } | |
119 | ||
69c91893 PJ |
120 | /* |
121 | * Tell the kernel about the EFI memory map. This might include | |
122 | * more than the max 128 entries that can fit in the e820 legacy | |
123 | * (zeropage) memory map. | |
124 | */ | |
125 | ||
200001eb | 126 | static void __init do_add_efi_memmap(void) |
69c91893 | 127 | { |
78ce248f | 128 | efi_memory_desc_t *md; |
69c91893 | 129 | |
78ce248f | 130 | for_each_efi_memory_desc(md) { |
69c91893 PJ |
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; | |
ad5fb870 DW |
155 | case EFI_PERSISTENT_MEMORY: |
156 | e820_type = E820_PMEM; | |
157 | break; | |
e2a71476 CW |
158 | default: |
159 | /* | |
160 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
161 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
162 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
163 | */ | |
69c91893 | 164 | e820_type = E820_RESERVED; |
e2a71476 CW |
165 | break; |
166 | } | |
d0be6bde | 167 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
168 | } |
169 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
170 | } | |
171 | ||
1adbfa35 | 172 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 173 | { |
15b9c359 | 174 | struct efi_info *e = &boot_params.efi_info; |
9479c7ce | 175 | struct efi_memory_map_data data; |
44511fb9 | 176 | phys_addr_t pmap; |
9479c7ce | 177 | int rv; |
ecacf09f | 178 | |
9f27bc54 DK |
179 | if (efi_enabled(EFI_PARAVIRT)) |
180 | return 0; | |
181 | ||
05486fa7 | 182 | #ifdef CONFIG_X86_32 |
1adbfa35 | 183 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 184 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
185 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
186 | return -EINVAL; | |
187 | } | |
15b9c359 | 188 | pmap = e->efi_memmap; |
05486fa7 | 189 | #else |
15b9c359 | 190 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 191 | #endif |
9479c7ce MF |
192 | data.phys_map = pmap; |
193 | data.size = e->efi_memmap_size; | |
194 | data.desc_size = e->efi_memdesc_size; | |
195 | data.desc_version = e->efi_memdesc_version; | |
196 | ||
197 | rv = efi_memmap_init_early(&data); | |
198 | if (rv) | |
199 | return rv; | |
200 | ||
201 | if (add_efi_memmap) | |
202 | do_add_efi_memmap(); | |
1adbfa35 | 203 | |
0d054ad9 AB |
204 | WARN(efi.memmap.desc_version != 1, |
205 | "Unexpected EFI_MEMORY_DESCRIPTOR version %ld", | |
206 | efi.memmap.desc_version); | |
207 | ||
884f4f66 | 208 | memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size); |
258f6fd7 | 209 | |
1adbfa35 | 210 | return 0; |
ecacf09f HY |
211 | } |
212 | ||
0bbea1ce | 213 | void __init efi_print_memmap(void) |
5b83683f HY |
214 | { |
215 | efi_memory_desc_t *md; | |
78ce248f | 216 | int i = 0; |
5b83683f | 217 | |
78ce248f | 218 | for_each_efi_memory_desc(md) { |
ace1d121 LE |
219 | char buf[64]; |
220 | ||
1e82b947 | 221 | pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n", |
78ce248f | 222 | i++, efi_md_typeattr_format(buf, sizeof(buf), md), |
ace1d121 | 223 | md->phys_addr, |
1e82b947 | 224 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1, |
5b83683f HY |
225 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); |
226 | } | |
f4fccac0 | 227 | } |
5b83683f | 228 | |
140bf275 | 229 | static int __init efi_systab_init(void *phys) |
5b83683f | 230 | { |
83e68189 | 231 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 | 232 | efi_system_table_64_t *systab64; |
1fec0533 | 233 | struct efi_setup_data *data = NULL; |
1adbfa35 OJ |
234 | u64 tmp = 0; |
235 | ||
1fec0533 DY |
236 | if (efi_setup) { |
237 | data = early_memremap(efi_setup, sizeof(*data)); | |
238 | if (!data) | |
239 | return -ENOMEM; | |
240 | } | |
abc93f8e | 241 | systab64 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
242 | sizeof(*systab64)); |
243 | if (systab64 == NULL) { | |
244 | pr_err("Couldn't map the system table!\n"); | |
1fec0533 | 245 | if (data) |
abc93f8e | 246 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
247 | return -ENOMEM; |
248 | } | |
249 | ||
250 | efi_systab.hdr = systab64->hdr; | |
1fec0533 DY |
251 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
252 | systab64->fw_vendor; | |
253 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; | |
1adbfa35 OJ |
254 | efi_systab.fw_revision = systab64->fw_revision; |
255 | efi_systab.con_in_handle = systab64->con_in_handle; | |
256 | tmp |= systab64->con_in_handle; | |
257 | efi_systab.con_in = systab64->con_in; | |
258 | tmp |= systab64->con_in; | |
259 | efi_systab.con_out_handle = systab64->con_out_handle; | |
260 | tmp |= systab64->con_out_handle; | |
261 | efi_systab.con_out = systab64->con_out; | |
262 | tmp |= systab64->con_out; | |
263 | efi_systab.stderr_handle = systab64->stderr_handle; | |
264 | tmp |= systab64->stderr_handle; | |
265 | efi_systab.stderr = systab64->stderr; | |
266 | tmp |= systab64->stderr; | |
1fec0533 DY |
267 | efi_systab.runtime = data ? |
268 | (void *)(unsigned long)data->runtime : | |
269 | (void *)(unsigned long)systab64->runtime; | |
270 | tmp |= data ? data->runtime : systab64->runtime; | |
1adbfa35 OJ |
271 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
272 | tmp |= systab64->boottime; | |
273 | efi_systab.nr_tables = systab64->nr_tables; | |
1fec0533 DY |
274 | efi_systab.tables = data ? (unsigned long)data->tables : |
275 | systab64->tables; | |
276 | tmp |= data ? data->tables : systab64->tables; | |
1adbfa35 | 277 | |
abc93f8e | 278 | early_memunmap(systab64, sizeof(*systab64)); |
1fec0533 | 279 | if (data) |
abc93f8e | 280 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
281 | #ifdef CONFIG_X86_32 |
282 | if (tmp >> 32) { | |
283 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
284 | return -EINVAL; | |
285 | } | |
286 | #endif | |
287 | } else { | |
288 | efi_system_table_32_t *systab32; | |
289 | ||
abc93f8e | 290 | systab32 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
291 | sizeof(*systab32)); |
292 | if (systab32 == NULL) { | |
293 | pr_err("Couldn't map the system table!\n"); | |
294 | return -ENOMEM; | |
295 | } | |
296 | ||
297 | efi_systab.hdr = systab32->hdr; | |
298 | efi_systab.fw_vendor = systab32->fw_vendor; | |
299 | efi_systab.fw_revision = systab32->fw_revision; | |
300 | efi_systab.con_in_handle = systab32->con_in_handle; | |
301 | efi_systab.con_in = systab32->con_in; | |
302 | efi_systab.con_out_handle = systab32->con_out_handle; | |
303 | efi_systab.con_out = systab32->con_out; | |
304 | efi_systab.stderr_handle = systab32->stderr_handle; | |
305 | efi_systab.stderr = systab32->stderr; | |
306 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
307 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
308 | efi_systab.nr_tables = systab32->nr_tables; | |
309 | efi_systab.tables = systab32->tables; | |
310 | ||
abc93f8e | 311 | early_memunmap(systab32, sizeof(*systab32)); |
140bf275 | 312 | } |
1adbfa35 | 313 | |
5b83683f HY |
314 | efi.systab = &efi_systab; |
315 | ||
316 | /* | |
317 | * Verify the EFI Table | |
318 | */ | |
140bf275 | 319 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 320 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
321 | return -EINVAL; |
322 | } | |
5b83683f | 323 | if ((efi.systab->hdr.revision >> 16) == 0) |
9b7d2049 | 324 | pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n", |
5b83683f HY |
325 | efi.systab->hdr.revision >> 16, |
326 | efi.systab->hdr.revision & 0xffff); | |
140bf275 OJ |
327 | |
328 | return 0; | |
83e7ee66 | 329 | } |
5b83683f | 330 | |
4f9dbcfc | 331 | static int __init efi_runtime_init32(void) |
83e7ee66 | 332 | { |
4f9dbcfc MF |
333 | efi_runtime_services_32_t *runtime; |
334 | ||
abc93f8e | 335 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc MF |
336 | sizeof(efi_runtime_services_32_t)); |
337 | if (!runtime) { | |
338 | pr_err("Could not map the runtime service table!\n"); | |
339 | return -ENOMEM; | |
340 | } | |
5b83683f HY |
341 | |
342 | /* | |
0ce4605c MK |
343 | * We will only need *early* access to the SetVirtualAddressMap |
344 | * EFI runtime service. All other runtime services will be called | |
345 | * via the virtual mapping. | |
5b83683f | 346 | */ |
4f9dbcfc MF |
347 | efi_phys.set_virtual_address_map = |
348 | (efi_set_virtual_address_map_t *) | |
349 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 350 | early_memunmap(runtime, sizeof(efi_runtime_services_32_t)); |
4f9dbcfc MF |
351 | |
352 | return 0; | |
353 | } | |
354 | ||
355 | static int __init efi_runtime_init64(void) | |
356 | { | |
357 | efi_runtime_services_64_t *runtime; | |
358 | ||
abc93f8e | 359 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc | 360 | sizeof(efi_runtime_services_64_t)); |
140bf275 | 361 | if (!runtime) { |
e3cb3f5a | 362 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
363 | return -ENOMEM; |
364 | } | |
4f9dbcfc | 365 | |
140bf275 | 366 | /* |
0ce4605c MK |
367 | * We will only need *early* access to the SetVirtualAddressMap |
368 | * EFI runtime service. All other runtime services will be called | |
369 | * via the virtual mapping. | |
140bf275 | 370 | */ |
140bf275 | 371 | efi_phys.set_virtual_address_map = |
4f9dbcfc MF |
372 | (efi_set_virtual_address_map_t *) |
373 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 374 | early_memunmap(runtime, sizeof(efi_runtime_services_64_t)); |
4f9dbcfc MF |
375 | |
376 | return 0; | |
377 | } | |
378 | ||
379 | static int __init efi_runtime_init(void) | |
380 | { | |
381 | int rv; | |
382 | ||
383 | /* | |
384 | * Check out the runtime services table. We need to map | |
385 | * the runtime services table so that we can grab the physical | |
386 | * address of several of the EFI runtime functions, needed to | |
387 | * set the firmware into virtual mode. | |
9f27bc54 DK |
388 | * |
389 | * When EFI_PARAVIRT is in force then we could not map runtime | |
390 | * service memory region because we do not have direct access to it. | |
391 | * However, runtime services are available through proxy functions | |
392 | * (e.g. in case of Xen dom0 EFI implementation they call special | |
393 | * hypercall which executes relevant EFI functions) and that is why | |
394 | * they are always enabled. | |
4f9dbcfc | 395 | */ |
4f9dbcfc | 396 | |
9f27bc54 DK |
397 | if (!efi_enabled(EFI_PARAVIRT)) { |
398 | if (efi_enabled(EFI_64BIT)) | |
399 | rv = efi_runtime_init64(); | |
400 | else | |
401 | rv = efi_runtime_init32(); | |
402 | ||
403 | if (rv) | |
404 | return rv; | |
405 | } | |
140bf275 | 406 | |
0f8093a9 MF |
407 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
408 | ||
140bf275 | 409 | return 0; |
83e7ee66 | 410 | } |
5b83683f | 411 | |
83e7ee66 OJ |
412 | void __init efi_init(void) |
413 | { | |
414 | efi_char16_t *c16; | |
415 | char vendor[100] = "unknown"; | |
416 | int i = 0; | |
417 | void *tmp; | |
418 | ||
419 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
420 | if (boot_params.efi_info.efi_systab_hi || |
421 | boot_params.efi_info.efi_memmap_hi) { | |
422 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
423 | return; |
424 | } | |
83e7ee66 OJ |
425 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
426 | #else | |
427 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
428 | (boot_params.efi_info.efi_systab | |
429 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
430 | #endif |
431 | ||
83e68189 | 432 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 433 | return; |
83e68189 | 434 | |
a0998eb1 DY |
435 | efi.config_table = (unsigned long)efi.systab->tables; |
436 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; | |
437 | efi.runtime = (unsigned long)efi.systab->runtime; | |
438 | ||
83e7ee66 OJ |
439 | /* |
440 | * Show what we know for posterity | |
441 | */ | |
abc93f8e | 442 | c16 = tmp = early_memremap(efi.systab->fw_vendor, 2); |
83e7ee66 OJ |
443 | if (c16) { |
444 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
445 | vendor[i] = *c16++; | |
446 | vendor[i] = '\0'; | |
447 | } else | |
e3cb3f5a | 448 | pr_err("Could not map the firmware vendor!\n"); |
abc93f8e | 449 | early_memunmap(tmp, 2); |
83e7ee66 | 450 | |
e3cb3f5a OJ |
451 | pr_info("EFI v%u.%.02u by %s\n", |
452 | efi.systab->hdr.revision >> 16, | |
453 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 454 | |
1fec0533 DY |
455 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
456 | return; | |
457 | ||
272686bf | 458 | if (efi_config_init(arch_tables)) |
140bf275 | 459 | return; |
83e68189 | 460 | |
1adbfa35 OJ |
461 | /* |
462 | * Note: We currently don't support runtime services on an EFI | |
463 | * that doesn't match the kernel 32/64-bit mode. | |
464 | */ | |
465 | ||
7d453eee | 466 | if (!efi_runtime_supported()) |
1adbfa35 | 467 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 468 | else { |
9479c7ce MF |
469 | if (efi_runtime_disabled() || efi_runtime_init()) { |
470 | efi_memmap_unmap(); | |
83e68189 | 471 | return; |
9479c7ce | 472 | } |
140bf275 | 473 | } |
83e68189 | 474 | |
fed6cefe | 475 | if (efi_enabled(EFI_DBG)) |
0bbea1ce | 476 | efi_print_memmap(); |
0bb54905 PJ |
477 | |
478 | efi_esrt_init(); | |
5b83683f HY |
479 | } |
480 | ||
2223af38 JT |
481 | void __init efi_late_init(void) |
482 | { | |
483 | efi_bgrt_init(); | |
484 | } | |
485 | ||
9cd2b07c MG |
486 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
487 | { | |
488 | u64 addr, npages; | |
489 | ||
490 | addr = md->virt_addr; | |
491 | npages = md->num_pages; | |
492 | ||
493 | memrange_efi_to_native(&addr, &npages); | |
494 | ||
495 | if (executable) | |
496 | set_memory_x(addr, npages); | |
497 | else | |
498 | set_memory_nx(addr, npages); | |
499 | } | |
500 | ||
c55d016f | 501 | void __init runtime_code_page_mkexec(void) |
a2172e25 HY |
502 | { |
503 | efi_memory_desc_t *md; | |
a2172e25 | 504 | |
a2172e25 | 505 | /* Make EFI runtime service code area executable */ |
78ce248f | 506 | for_each_efi_memory_desc(md) { |
1c083eb2 HY |
507 | if (md->type != EFI_RUNTIME_SERVICES_CODE) |
508 | continue; | |
509 | ||
9cd2b07c | 510 | efi_set_executable(md, true); |
a2172e25 | 511 | } |
a2172e25 | 512 | } |
a2172e25 | 513 | |
4e78eb05 | 514 | void __init efi_memory_uc(u64 addr, unsigned long size) |
3e8fa263 MF |
515 | { |
516 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
517 | u64 npages; | |
518 | ||
519 | npages = round_up(size, page_shift) / page_shift; | |
520 | memrange_efi_to_native(&addr, &npages); | |
521 | set_memory_uc(addr, npages); | |
522 | } | |
523 | ||
d2f7cbe7 BP |
524 | void __init old_map_region(efi_memory_desc_t *md) |
525 | { | |
526 | u64 start_pfn, end_pfn, end; | |
527 | unsigned long size; | |
528 | void *va; | |
529 | ||
530 | start_pfn = PFN_DOWN(md->phys_addr); | |
531 | size = md->num_pages << PAGE_SHIFT; | |
532 | end = md->phys_addr + size; | |
533 | end_pfn = PFN_UP(end); | |
534 | ||
535 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { | |
536 | va = __va(md->phys_addr); | |
537 | ||
538 | if (!(md->attribute & EFI_MEMORY_WB)) | |
539 | efi_memory_uc((u64)(unsigned long)va, size); | |
540 | } else | |
541 | va = efi_ioremap(md->phys_addr, size, | |
542 | md->type, md->attribute); | |
543 | ||
544 | md->virt_addr = (u64) (unsigned long) va; | |
545 | if (!va) | |
546 | pr_err("ioremap of 0x%llX failed!\n", | |
547 | (unsigned long long)md->phys_addr); | |
548 | } | |
549 | ||
481f75c0 DY |
550 | /* Merge contiguous regions of the same type and attribute */ |
551 | static void __init efi_merge_regions(void) | |
5b83683f | 552 | { |
202f9d0a | 553 | efi_memory_desc_t *md, *prev_md = NULL; |
202f9d0a | 554 | |
78ce248f | 555 | for_each_efi_memory_desc(md) { |
202f9d0a | 556 | u64 prev_size; |
202f9d0a MG |
557 | |
558 | if (!prev_md) { | |
559 | prev_md = md; | |
560 | continue; | |
561 | } | |
562 | ||
563 | if (prev_md->type != md->type || | |
564 | prev_md->attribute != md->attribute) { | |
565 | prev_md = md; | |
566 | continue; | |
567 | } | |
568 | ||
569 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
570 | ||
571 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
572 | prev_md->num_pages += md->num_pages; | |
573 | md->type = EFI_RESERVED_TYPE; | |
574 | md->attribute = 0; | |
575 | continue; | |
576 | } | |
577 | prev_md = md; | |
481f75c0 DY |
578 | } |
579 | } | |
580 | ||
581 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) | |
582 | { | |
583 | unsigned long size; | |
584 | u64 end, systab; | |
d2f7cbe7 | 585 | |
481f75c0 DY |
586 | size = md->num_pages << EFI_PAGE_SHIFT; |
587 | end = md->phys_addr + size; | |
588 | systab = (u64)(unsigned long)efi_phys.systab; | |
589 | if (md->phys_addr <= systab && systab < end) { | |
590 | systab += md->virt_addr - md->phys_addr; | |
591 | efi.systab = (efi_system_table_t *)(unsigned long)systab; | |
202f9d0a | 592 | } |
481f75c0 DY |
593 | } |
594 | ||
b7b898ae BP |
595 | static void *realloc_pages(void *old_memmap, int old_shift) |
596 | { | |
597 | void *ret; | |
598 | ||
599 | ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1); | |
600 | if (!ret) | |
601 | goto out; | |
602 | ||
603 | /* | |
604 | * A first-time allocation doesn't have anything to copy. | |
605 | */ | |
606 | if (!old_memmap) | |
607 | return ret; | |
608 | ||
609 | memcpy(ret, old_memmap, PAGE_SIZE << old_shift); | |
610 | ||
611 | out: | |
612 | free_pages((unsigned long)old_memmap, old_shift); | |
613 | return ret; | |
614 | } | |
615 | ||
a5caa209 MF |
616 | /* |
617 | * Iterate the EFI memory map in reverse order because the regions | |
618 | * will be mapped top-down. The end result is the same as if we had | |
619 | * mapped things forward, but doesn't require us to change the | |
620 | * existing implementation of efi_map_region(). | |
621 | */ | |
622 | static inline void *efi_map_next_entry_reverse(void *entry) | |
623 | { | |
624 | /* Initial call */ | |
625 | if (!entry) | |
884f4f66 | 626 | return efi.memmap.map_end - efi.memmap.desc_size; |
a5caa209 | 627 | |
884f4f66 MF |
628 | entry -= efi.memmap.desc_size; |
629 | if (entry < efi.memmap.map) | |
a5caa209 MF |
630 | return NULL; |
631 | ||
632 | return entry; | |
633 | } | |
634 | ||
635 | /* | |
636 | * efi_map_next_entry - Return the next EFI memory map descriptor | |
637 | * @entry: Previous EFI memory map descriptor | |
638 | * | |
639 | * This is a helper function to iterate over the EFI memory map, which | |
640 | * we do in different orders depending on the current configuration. | |
641 | * | |
642 | * To begin traversing the memory map @entry must be %NULL. | |
643 | * | |
644 | * Returns %NULL when we reach the end of the memory map. | |
645 | */ | |
646 | static void *efi_map_next_entry(void *entry) | |
647 | { | |
648 | if (!efi_enabled(EFI_OLD_MEMMAP) && efi_enabled(EFI_64BIT)) { | |
649 | /* | |
650 | * Starting in UEFI v2.5 the EFI_PROPERTIES_TABLE | |
651 | * config table feature requires us to map all entries | |
652 | * in the same order as they appear in the EFI memory | |
653 | * map. That is to say, entry N must have a lower | |
654 | * virtual address than entry N+1. This is because the | |
655 | * firmware toolchain leaves relative references in | |
656 | * the code/data sections, which are split and become | |
657 | * separate EFI memory regions. Mapping things | |
658 | * out-of-order leads to the firmware accessing | |
659 | * unmapped addresses. | |
660 | * | |
661 | * Since we need to map things this way whether or not | |
662 | * the kernel actually makes use of | |
663 | * EFI_PROPERTIES_TABLE, let's just switch to this | |
664 | * scheme by default for 64-bit. | |
665 | */ | |
666 | return efi_map_next_entry_reverse(entry); | |
667 | } | |
668 | ||
669 | /* Initial call */ | |
670 | if (!entry) | |
884f4f66 | 671 | return efi.memmap.map; |
a5caa209 | 672 | |
884f4f66 MF |
673 | entry += efi.memmap.desc_size; |
674 | if (entry >= efi.memmap.map_end) | |
a5caa209 MF |
675 | return NULL; |
676 | ||
677 | return entry; | |
678 | } | |
679 | ||
ab72a27d MF |
680 | static bool should_map_region(efi_memory_desc_t *md) |
681 | { | |
682 | /* | |
683 | * Runtime regions always require runtime mappings (obviously). | |
684 | */ | |
685 | if (md->attribute & EFI_MEMORY_RUNTIME) | |
686 | return true; | |
687 | ||
688 | /* | |
689 | * 32-bit EFI doesn't suffer from the bug that requires us to | |
690 | * reserve boot services regions, and mixed mode support | |
691 | * doesn't exist for 32-bit kernels. | |
692 | */ | |
693 | if (IS_ENABLED(CONFIG_X86_32)) | |
694 | return false; | |
695 | ||
696 | /* | |
697 | * Map all of RAM so that we can access arguments in the 1:1 | |
698 | * mapping when making EFI runtime calls. | |
699 | */ | |
700 | if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_is_native()) { | |
701 | if (md->type == EFI_CONVENTIONAL_MEMORY || | |
702 | md->type == EFI_LOADER_DATA || | |
703 | md->type == EFI_LOADER_CODE) | |
704 | return true; | |
705 | } | |
706 | ||
707 | /* | |
708 | * Map boot services regions as a workaround for buggy | |
709 | * firmware that accesses them even when they shouldn't. | |
710 | * | |
711 | * See efi_{reserve,free}_boot_services(). | |
712 | */ | |
713 | if (md->type == EFI_BOOT_SERVICES_CODE || | |
714 | md->type == EFI_BOOT_SERVICES_DATA) | |
715 | return true; | |
716 | ||
717 | return false; | |
718 | } | |
719 | ||
481f75c0 | 720 | /* |
b7b898ae BP |
721 | * Map the efi memory ranges of the runtime services and update new_mmap with |
722 | * virtual addresses. | |
481f75c0 | 723 | */ |
b7b898ae | 724 | static void * __init efi_map_regions(int *count, int *pg_shift) |
481f75c0 | 725 | { |
b7b898ae BP |
726 | void *p, *new_memmap = NULL; |
727 | unsigned long left = 0; | |
884f4f66 | 728 | unsigned long desc_size; |
481f75c0 | 729 | efi_memory_desc_t *md; |
202f9d0a | 730 | |
884f4f66 MF |
731 | desc_size = efi.memmap.desc_size; |
732 | ||
a5caa209 MF |
733 | p = NULL; |
734 | while ((p = efi_map_next_entry(p))) { | |
5b83683f | 735 | md = p; |
ab72a27d MF |
736 | |
737 | if (!should_map_region(md)) | |
738 | continue; | |
1c083eb2 | 739 | |
d2f7cbe7 | 740 | efi_map_region(md); |
481f75c0 DY |
741 | get_systab_virt_addr(md); |
742 | ||
884f4f66 | 743 | if (left < desc_size) { |
b7b898ae BP |
744 | new_memmap = realloc_pages(new_memmap, *pg_shift); |
745 | if (!new_memmap) | |
746 | return NULL; | |
747 | ||
748 | left += PAGE_SIZE << *pg_shift; | |
749 | (*pg_shift)++; | |
750 | } | |
751 | ||
884f4f66 | 752 | memcpy(new_memmap + (*count * desc_size), md, desc_size); |
b7b898ae | 753 | |
884f4f66 | 754 | left -= desc_size; |
481f75c0 DY |
755 | (*count)++; |
756 | } | |
d2f7cbe7 | 757 | |
481f75c0 | 758 | return new_memmap; |
481f75c0 DY |
759 | } |
760 | ||
fabb37c7 BP |
761 | static void __init kexec_enter_virtual_mode(void) |
762 | { | |
2965faa5 | 763 | #ifdef CONFIG_KEXEC_CORE |
fabb37c7 | 764 | efi_memory_desc_t *md; |
753b11ef | 765 | unsigned int num_pages; |
fabb37c7 BP |
766 | |
767 | efi.systab = NULL; | |
768 | ||
769 | /* | |
770 | * We don't do virtual mode, since we don't do runtime services, on | |
771 | * non-native EFI | |
772 | */ | |
773 | if (!efi_is_native()) { | |
9479c7ce | 774 | efi_memmap_unmap(); |
a5a750a9 | 775 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 BP |
776 | return; |
777 | } | |
778 | ||
753b11ef MF |
779 | if (efi_alloc_page_tables()) { |
780 | pr_err("Failed to allocate EFI page tables\n"); | |
781 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
782 | return; | |
783 | } | |
784 | ||
fabb37c7 BP |
785 | /* |
786 | * Map efi regions which were passed via setup_data. The virt_addr is a | |
787 | * fixed addr which was used in first kernel of a kexec boot. | |
788 | */ | |
78ce248f | 789 | for_each_efi_memory_desc(md) { |
fabb37c7 BP |
790 | efi_map_region_fixed(md); /* FIXME: add error handling */ |
791 | get_systab_virt_addr(md); | |
792 | } | |
793 | ||
dca0f971 MF |
794 | /* |
795 | * Unregister the early EFI memmap from efi_init() and install | |
796 | * the new EFI memory map. | |
797 | */ | |
798 | efi_memmap_unmap(); | |
799 | ||
800 | if (efi_memmap_init_late(efi.memmap.phys_map, | |
801 | efi.memmap.desc_size * efi.memmap.nr_map)) { | |
802 | pr_err("Failed to remap late EFI memory map\n"); | |
803 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
804 | return; | |
805 | } | |
806 | ||
fabb37c7 BP |
807 | BUG_ON(!efi.systab); |
808 | ||
884f4f66 | 809 | num_pages = ALIGN(efi.memmap.nr_map * efi.memmap.desc_size, PAGE_SIZE); |
753b11ef MF |
810 | num_pages >>= PAGE_SHIFT; |
811 | ||
884f4f66 | 812 | if (efi_setup_page_tables(efi.memmap.phys_map, num_pages)) { |
753b11ef MF |
813 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
814 | return; | |
815 | } | |
816 | ||
fabb37c7 BP |
817 | efi_sync_low_kernel_mappings(); |
818 | ||
819 | /* | |
820 | * Now that EFI is in virtual mode, update the function | |
821 | * pointers in the runtime service table to the new virtual addresses. | |
822 | * | |
823 | * Call EFI services through wrapper functions. | |
824 | */ | |
825 | efi.runtime_version = efi_systab.hdr.revision; | |
994448f1 | 826 | |
022ee6c5 | 827 | efi_native_runtime_setup(); |
994448f1 | 828 | |
fabb37c7 | 829 | efi.set_virtual_address_map = NULL; |
fabb37c7 BP |
830 | |
831 | if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX)) | |
832 | runtime_code_page_mkexec(); | |
833 | ||
834 | /* clean DUMMY object */ | |
eeb9db09 | 835 | efi_delete_dummy_variable(); |
fabb37c7 BP |
836 | #endif |
837 | } | |
838 | ||
481f75c0 DY |
839 | /* |
840 | * This function will switch the EFI runtime services to virtual mode. | |
841 | * Essentially, we look through the EFI memmap and map every region that | |
842 | * has the runtime attribute bit set in its memory descriptor into the | |
67a9108e | 843 | * efi_pgd page table. |
481f75c0 DY |
844 | * |
845 | * The old method which used to update that memory descriptor with the | |
846 | * virtual address obtained from ioremap() is still supported when the | |
847 | * kernel is booted with efi=old_map on its command line. Same old | |
848 | * method enabled the runtime services to be called without having to | |
849 | * thunk back into physical mode for every invocation. | |
850 | * | |
851 | * The new method does a pagetable switch in a preemption-safe manner | |
852 | * so that we're in a different address space when calling a runtime | |
67a9108e MF |
853 | * function. For function arguments passing we do copy the PUDs of the |
854 | * kernel page table into efi_pgd prior to each call. | |
1fec0533 DY |
855 | * |
856 | * Specially for kexec boot, efi runtime maps in previous kernel should | |
857 | * be passed in via setup_data. In that case runtime ranges will be mapped | |
fabb37c7 BP |
858 | * to the same virtual addresses as the first kernel, see |
859 | * kexec_enter_virtual_mode(). | |
481f75c0 | 860 | */ |
fabb37c7 | 861 | static void __init __efi_enter_virtual_mode(void) |
481f75c0 | 862 | { |
fabb37c7 | 863 | int count = 0, pg_shift = 0; |
481f75c0 | 864 | void *new_memmap = NULL; |
b7b898ae | 865 | efi_status_t status; |
dca0f971 | 866 | phys_addr_t pa; |
1c083eb2 | 867 | |
481f75c0 | 868 | efi.systab = NULL; |
d2f7cbe7 | 869 | |
67a9108e MF |
870 | if (efi_alloc_page_tables()) { |
871 | pr_err("Failed to allocate EFI page tables\n"); | |
872 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
873 | return; | |
874 | } | |
875 | ||
fabb37c7 BP |
876 | efi_merge_regions(); |
877 | new_memmap = efi_map_regions(&count, &pg_shift); | |
878 | if (!new_memmap) { | |
879 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); | |
a5a750a9 | 880 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 | 881 | return; |
b7b898ae | 882 | } |
926172d4 | 883 | |
dca0f971 MF |
884 | pa = __pa(new_memmap); |
885 | ||
886 | /* | |
887 | * Unregister the early EFI memmap from efi_init() and install | |
888 | * the new EFI memory map that we are about to pass to the | |
889 | * firmware via SetVirtualAddressMap(). | |
890 | */ | |
891 | efi_memmap_unmap(); | |
892 | ||
893 | if (efi_memmap_init_late(pa, efi.memmap.desc_size * count)) { | |
894 | pr_err("Failed to remap late EFI memory map\n"); | |
895 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); | |
896 | return; | |
897 | } | |
898 | ||
5b83683f HY |
899 | BUG_ON(!efi.systab); |
900 | ||
dca0f971 | 901 | if (efi_setup_page_tables(pa, 1 << pg_shift)) { |
a5a750a9 | 902 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
fabb37c7 | 903 | return; |
a5a750a9 | 904 | } |
b7b898ae | 905 | |
d2f7cbe7 BP |
906 | efi_sync_low_kernel_mappings(); |
907 | ||
994448f1 MF |
908 | if (efi_is_native()) { |
909 | status = phys_efi_set_virtual_address_map( | |
884f4f66 MF |
910 | efi.memmap.desc_size * count, |
911 | efi.memmap.desc_size, | |
912 | efi.memmap.desc_version, | |
dca0f971 | 913 | (efi_memory_desc_t *)pa); |
994448f1 MF |
914 | } else { |
915 | status = efi_thunk_set_virtual_address_map( | |
916 | efi_phys.set_virtual_address_map, | |
884f4f66 MF |
917 | efi.memmap.desc_size * count, |
918 | efi.memmap.desc_size, | |
919 | efi.memmap.desc_version, | |
dca0f971 | 920 | (efi_memory_desc_t *)pa); |
994448f1 | 921 | } |
1fec0533 | 922 | |
fabb37c7 BP |
923 | if (status != EFI_SUCCESS) { |
924 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", | |
925 | status); | |
926 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
5b83683f HY |
927 | } |
928 | ||
929 | /* | |
930 | * Now that EFI is in virtual mode, update the function | |
931 | * pointers in the runtime service table to the new virtual addresses. | |
932 | * | |
933 | * Call EFI services through wrapper functions. | |
934 | */ | |
712ba9e9 | 935 | efi.runtime_version = efi_systab.hdr.revision; |
4f9dbcfc MF |
936 | |
937 | if (efi_is_native()) | |
022ee6c5 | 938 | efi_native_runtime_setup(); |
4f9dbcfc MF |
939 | else |
940 | efi_thunk_runtime_setup(); | |
941 | ||
2b5e8ef3 | 942 | efi.set_virtual_address_map = NULL; |
d2f7cbe7 | 943 | |
6d0cc887 SP |
944 | /* |
945 | * Apply more restrictive page table mapping attributes now that | |
946 | * SVAM() has been called and the firmware has performed all | |
947 | * necessary relocation fixups for the new virtual addresses. | |
948 | */ | |
949 | efi_runtime_update_mappings(); | |
950 | efi_dump_pagetable(); | |
1adbfa35 | 951 | |
f8b84043 | 952 | /* clean DUMMY object */ |
eeb9db09 | 953 | efi_delete_dummy_variable(); |
5b83683f HY |
954 | } |
955 | ||
fabb37c7 BP |
956 | void __init efi_enter_virtual_mode(void) |
957 | { | |
9f27bc54 DK |
958 | if (efi_enabled(EFI_PARAVIRT)) |
959 | return; | |
960 | ||
fabb37c7 BP |
961 | if (efi_setup) |
962 | kexec_enter_virtual_mode(); | |
963 | else | |
964 | __efi_enter_virtual_mode(); | |
965 | } | |
966 | ||
5b83683f HY |
967 | /* |
968 | * Convenience functions to obtain memory types and attributes | |
969 | */ | |
970 | u32 efi_mem_type(unsigned long phys_addr) | |
971 | { | |
972 | efi_memory_desc_t *md; | |
5b83683f | 973 | |
83e68189 MF |
974 | if (!efi_enabled(EFI_MEMMAP)) |
975 | return 0; | |
976 | ||
78ce248f | 977 | for_each_efi_memory_desc(md) { |
5b83683f HY |
978 | if ((md->phys_addr <= phys_addr) && |
979 | (phys_addr < (md->phys_addr + | |
980 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
981 | return md->type; | |
982 | } | |
983 | return 0; | |
984 | } | |
985 | ||
5ae3683c | 986 | static int __init arch_parse_efi_cmdline(char *str) |
d2f7cbe7 | 987 | { |
9115c758 RN |
988 | if (!str) { |
989 | pr_warn("need at least one option\n"); | |
990 | return -EINVAL; | |
991 | } | |
992 | ||
6ccc72b8 DY |
993 | if (parse_option_str(str, "old_map")) |
994 | set_bit(EFI_OLD_MEMMAP, &efi.flags); | |
d2f7cbe7 BP |
995 | |
996 | return 0; | |
997 | } | |
5ae3683c | 998 | early_param("efi", arch_parse_efi_cmdline); |