aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/platform/efi
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/platform/efi')
-rw-r--r--arch/x86/platform/efi/Makefile1
-rw-r--r--arch/x86/platform/efi/efi.c710
-rw-r--r--arch/x86/platform/efi/efi_32.c112
-rw-r--r--arch/x86/platform/efi/efi_64.c99
-rw-r--r--arch/x86/platform/efi/efi_stub_32.S123
-rw-r--r--arch/x86/platform/efi/efi_stub_64.S116
6 files changed, 1161 insertions, 0 deletions
diff --git a/arch/x86/platform/efi/Makefile b/arch/x86/platform/efi/Makefile
new file mode 100644
index 000000000000..73b8be0f3675
--- /dev/null
+++ b/arch/x86/platform/efi/Makefile
@@ -0,0 +1 @@
obj-$(CONFIG_EFI) += efi.o efi_$(BITS).o efi_stub_$(BITS).o
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
new file mode 100644
index 000000000000..899e393d8e73
--- /dev/null
+++ b/arch/x86/platform/efi/efi.c
@@ -0,0 +1,710 @@
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>
15 *
16 * Copied from efi_32.c to eliminate the duplicated code between EFI
17 * 32/64 support code. --ying 2007-10-26
18 *
19 * All EFI Runtime Services are not implemented yet as EFI only
20 * supports physical mode addressing on SoftSDV. This is to be fixed
21 * in a future version. --drummond 1999-07-20
22 *
23 * Implemented EFI runtime services and virtual mode calls. --davidm
24 *
25 * Goutham Rao: <goutham.rao@intel.com>
26 * Skip non-WB memory and ignore empty memory ranges.
27 */
28
29#include <linux/kernel.h>
30#include <linux/init.h>
31#include <linux/efi.h>
32#include <linux/bootmem.h>
33#include <linux/memblock.h>
34#include <linux/spinlock.h>
35#include <linux/uaccess.h>
36#include <linux/time.h>
37#include <linux/io.h>
38#include <linux/reboot.h>
39#include <linux/bcd.h>
40
41#include <asm/setup.h>
42#include <asm/efi.h>
43#include <asm/time.h>
44#include <asm/cacheflush.h>
45#include <asm/tlbflush.h>
46#include <asm/x86_init.h>
47
48#define EFI_DEBUG 1
49#define PFX "EFI: "
50
51int efi_enabled;
52EXPORT_SYMBOL(efi_enabled);
53
54struct efi efi;
55EXPORT_SYMBOL(efi);
56
57struct efi_memory_map memmap;
58
59static struct efi efi_phys __initdata;
60static efi_system_table_t efi_systab __initdata;
61
62static int __init setup_noefi(char *arg)
63{
64 efi_enabled = 0;
65 return 0;
66}
67early_param("noefi", setup_noefi);
68
69int add_efi_memmap;
70EXPORT_SYMBOL(add_efi_memmap);
71
72static int __init setup_add_efi_memmap(char *arg)
73{
74 add_efi_memmap = 1;
75 return 0;
76}
77early_param("add_efi_memmap", setup_add_efi_memmap);
78
79
80static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
81{
82 return efi_call_virt2(get_time, tm, tc);
83}
84
85static efi_status_t virt_efi_set_time(efi_time_t *tm)
86{
87 return efi_call_virt1(set_time, tm);
88}
89
90static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
91 efi_bool_t *pending,
92 efi_time_t *tm)
93{
94 return efi_call_virt3(get_wakeup_time,
95 enabled, pending, tm);
96}
97
98static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
99{
100 return efi_call_virt2(set_wakeup_time,
101 enabled, tm);
102}
103
104static efi_status_t virt_efi_get_variable(efi_char16_t *name,
105 efi_guid_t *vendor,
106 u32 *attr,
107 unsigned long *data_size,
108 void *data)
109{
110 return efi_call_virt5(get_variable,
111 name, vendor, attr,
112 data_size, data);
113}
114
115static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
116 efi_char16_t *name,
117 efi_guid_t *vendor)
118{
119 return efi_call_virt3(get_next_variable,
120 name_size, name, vendor);
121}
122
123static efi_status_t virt_efi_set_variable(efi_char16_t *name,
124 efi_guid_t *vendor,
125 unsigned long attr,
126 unsigned long data_size,
127 void *data)
128{
129 return efi_call_virt5(set_variable,
130 name, vendor, attr,
131 data_size, data);
132}
133
134static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
135{
136 return efi_call_virt1(get_next_high_mono_count, count);
137}
138
139static void virt_efi_reset_system(int reset_type,
140 efi_status_t status,
141 unsigned long data_size,
142 efi_char16_t *data)
143{
144 efi_call_virt4(reset_system, reset_type, status,
145 data_size, data);
146}
147
148static efi_status_t __init phys_efi_set_virtual_address_map(
149 unsigned long memory_map_size,
150 unsigned long descriptor_size,
151 u32 descriptor_version,
152 efi_memory_desc_t *virtual_map)
153{
154 efi_status_t status;
155
156 efi_call_phys_prelog();
157 status = efi_call_phys4(efi_phys.set_virtual_address_map,
158 memory_map_size, descriptor_size,
159 descriptor_version, virtual_map);
160 efi_call_phys_epilog();
161 return status;
162}
163
164static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
165 efi_time_cap_t *tc)
166{
167 efi_status_t status;
168
169 efi_call_phys_prelog();
170 status = efi_call_phys2(efi_phys.get_time, tm, tc);
171 efi_call_phys_epilog();
172 return status;
173}
174
175int efi_set_rtc_mmss(unsigned long nowtime)
176{
177 int real_seconds, real_minutes;
178 efi_status_t status;
179 efi_time_t eft;
180 efi_time_cap_t cap;
181
182 status = efi.get_time(&eft, &cap);
183 if (status != EFI_SUCCESS) {
184 printk(KERN_ERR "Oops: efitime: can't read time!\n");
185 return -1;
186 }
187
188 real_seconds = nowtime % 60;
189 real_minutes = nowtime / 60;
190 if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
191 real_minutes += 30;
192 real_minutes %= 60;
193 eft.minute = real_minutes;
194 eft.second = real_seconds;
195
196 status = efi.set_time(&eft);
197 if (status != EFI_SUCCESS) {
198 printk(KERN_ERR "Oops: efitime: can't write time!\n");
199 return -1;
200 }
201 return 0;
202}
203
204unsigned long efi_get_time(void)
205{
206 efi_status_t status;
207 efi_time_t eft;
208 efi_time_cap_t cap;
209
210 status = efi.get_time(&eft, &cap);
211 if (status != EFI_SUCCESS)
212 printk(KERN_ERR "Oops: efitime: can't read time!\n");
213
214 return mktime(eft.year, eft.month, eft.day, eft.hour,
215 eft.minute, eft.second);
216}
217
218/*
219 * Tell the kernel about the EFI memory map. This might include
220 * more than the max 128 entries that can fit in the e820 legacy
221 * (zeropage) memory map.
222 */
223
224static void __init do_add_efi_memmap(void)
225{
226 void *p;
227
228 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
229 efi_memory_desc_t *md = p;
230 unsigned long long start = md->phys_addr;
231 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
232 int e820_type;
233
234 switch (md->type) {
235 case EFI_LOADER_CODE:
236 case EFI_LOADER_DATA:
237 case EFI_BOOT_SERVICES_CODE:
238 case EFI_BOOT_SERVICES_DATA:
239 case EFI_CONVENTIONAL_MEMORY:
240 if (md->attribute & EFI_MEMORY_WB)
241 e820_type = E820_RAM;
242 else
243 e820_type = E820_RESERVED;
244 break;
245 case EFI_ACPI_RECLAIM_MEMORY:
246 e820_type = E820_ACPI;
247 break;
248 case EFI_ACPI_MEMORY_NVS:
249 e820_type = E820_NVS;
250 break;
251 case EFI_UNUSABLE_MEMORY:
252 e820_type = E820_UNUSABLE;
253 break;
254 default:
255 /*
256 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
257 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
258 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
259 */
260 e820_type = E820_RESERVED;
261 break;
262 }
263 e820_add_region(start, size, e820_type);
264 }
265 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
266}
267
268void __init efi_memblock_x86_reserve_range(void)
269{
270 unsigned long pmap;
271
272#ifdef CONFIG_X86_32
273 pmap = boot_params.efi_info.efi_memmap;
274#else
275 pmap = (boot_params.efi_info.efi_memmap |
276 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
277#endif
278 memmap.phys_map = (void *)pmap;
279 memmap.nr_map = boot_params.efi_info.efi_memmap_size /
280 boot_params.efi_info.efi_memdesc_size;
281 memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
282 memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
283 memblock_x86_reserve_range(pmap, pmap + memmap.nr_map * memmap.desc_size,
284 "EFI memmap");
285}
286
287#if EFI_DEBUG
288static void __init print_efi_memmap(void)
289{
290 efi_memory_desc_t *md;
291 void *p;
292 int i;
293
294 for (p = memmap.map, i = 0;
295 p < memmap.map_end;
296 p += memmap.desc_size, i++) {
297 md = p;
298 printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
299 "range=[0x%016llx-0x%016llx) (%lluMB)\n",
300 i, md->type, md->attribute, md->phys_addr,
301 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
302 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
303 }
304}
305#endif /* EFI_DEBUG */
306
307void __init efi_reserve_boot_services(void)
308{
309 void *p;
310
311 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
312 efi_memory_desc_t *md = p;
313 u64 start = md->phys_addr;
314 u64 size = md->num_pages << EFI_PAGE_SHIFT;
315
316 if (md->type != EFI_BOOT_SERVICES_CODE &&
317 md->type != EFI_BOOT_SERVICES_DATA)
318 continue;
319 /* Only reserve where possible:
320 * - Not within any already allocated areas
321 * - Not over any memory area (really needed, if above?)
322 * - Not within any part of the kernel
323 * - Not the bios reserved area
324 */
325 if ((start+size >= virt_to_phys(_text)
326 && start <= virt_to_phys(_end)) ||
327 !e820_all_mapped(start, start+size, E820_RAM) ||
328 memblock_x86_check_reserved_size(&start, &size,
329 1<<EFI_PAGE_SHIFT)) {
330 /* Could not reserve, skip it */
331 md->num_pages = 0;
332 memblock_dbg(PFX "Could not reserve boot range "
333 "[0x%010llx-0x%010llx]\n",
334 start, start+size-1);
335 } else
336 memblock_x86_reserve_range(start, start+size,
337 "EFI Boot");
338 }
339}
340
341static void __init efi_free_boot_services(void)
342{
343 void *p;
344
345 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
346 efi_memory_desc_t *md = p;
347 unsigned long long start = md->phys_addr;
348 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
349
350 if (md->type != EFI_BOOT_SERVICES_CODE &&
351 md->type != EFI_BOOT_SERVICES_DATA)
352 continue;
353
354 /* Could not reserve boot area */
355 if (!size)
356 continue;
357
358 free_bootmem_late(start, size);
359 }
360}
361
362void __init efi_init(void)
363{
364 efi_config_table_t *config_tables;
365 efi_runtime_services_t *runtime;
366 efi_char16_t *c16;
367 char vendor[100] = "unknown";
368 int i = 0;
369 void *tmp;
370
371#ifdef CONFIG_X86_32
372 efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
373#else
374 efi_phys.systab = (efi_system_table_t *)
375 (boot_params.efi_info.efi_systab |
376 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
377#endif
378
379 efi.systab = early_ioremap((unsigned long)efi_phys.systab,
380 sizeof(efi_system_table_t));
381 if (efi.systab == NULL)
382 printk(KERN_ERR "Couldn't map the EFI system table!\n");
383 memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
384 early_iounmap(efi.systab, sizeof(efi_system_table_t));
385 efi.systab = &efi_systab;
386
387 /*
388 * Verify the EFI Table
389 */
390 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
391 printk(KERN_ERR "EFI system table signature incorrect!\n");
392 if ((efi.systab->hdr.revision >> 16) == 0)
393 printk(KERN_ERR "Warning: EFI system table version "
394 "%d.%02d, expected 1.00 or greater!\n",
395 efi.systab->hdr.revision >> 16,
396 efi.systab->hdr.revision & 0xffff);
397
398 /*
399 * Show what we know for posterity
400 */
401 c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
402 if (c16) {
403 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
404 vendor[i] = *c16++;
405 vendor[i] = '\0';
406 } else
407 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
408 early_iounmap(tmp, 2);
409
410 printk(KERN_INFO "EFI v%u.%.02u by %s\n",
411 efi.systab->hdr.revision >> 16,
412 efi.systab->hdr.revision & 0xffff, vendor);
413
414 /*
415 * Let's see what config tables the firmware passed to us.
416 */
417 config_tables = early_ioremap(
418 efi.systab->tables,
419 efi.systab->nr_tables * sizeof(efi_config_table_t));
420 if (config_tables == NULL)
421 printk(KERN_ERR "Could not map EFI Configuration Table!\n");
422
423 printk(KERN_INFO);
424 for (i = 0; i < efi.systab->nr_tables; i++) {
425 if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
426 efi.mps = config_tables[i].table;
427 printk(" MPS=0x%lx ", config_tables[i].table);
428 } else if (!efi_guidcmp(config_tables[i].guid,
429 ACPI_20_TABLE_GUID)) {
430 efi.acpi20 = config_tables[i].table;
431 printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
432 } else if (!efi_guidcmp(config_tables[i].guid,
433 ACPI_TABLE_GUID)) {
434 efi.acpi = config_tables[i].table;
435 printk(" ACPI=0x%lx ", config_tables[i].table);
436 } else if (!efi_guidcmp(config_tables[i].guid,
437 SMBIOS_TABLE_GUID)) {
438 efi.smbios = config_tables[i].table;
439 printk(" SMBIOS=0x%lx ", config_tables[i].table);
440#ifdef CONFIG_X86_UV
441 } else if (!efi_guidcmp(config_tables[i].guid,
442 UV_SYSTEM_TABLE_GUID)) {
443 efi.uv_systab = config_tables[i].table;
444 printk(" UVsystab=0x%lx ", config_tables[i].table);
445#endif
446 } else if (!efi_guidcmp(config_tables[i].guid,
447 HCDP_TABLE_GUID)) {
448 efi.hcdp = config_tables[i].table;
449 printk(" HCDP=0x%lx ", config_tables[i].table);
450 } else if (!efi_guidcmp(config_tables[i].guid,
451 UGA_IO_PROTOCOL_GUID)) {
452 efi.uga = config_tables[i].table;
453 printk(" UGA=0x%lx ", config_tables[i].table);
454 }
455 }
456 printk("\n");
457 early_iounmap(config_tables,
458 efi.systab->nr_tables * sizeof(efi_config_table_t));
459
460 /*
461 * Check out the runtime services table. We need to map
462 * the runtime services table so that we can grab the physical
463 * address of several of the EFI runtime functions, needed to
464 * set the firmware into virtual mode.
465 */
466 runtime = early_ioremap((unsigned long)efi.systab->runtime,
467 sizeof(efi_runtime_services_t));
468 if (runtime != NULL) {
469 /*
470 * We will only need *early* access to the following
471 * two EFI runtime services before set_virtual_address_map
472 * is invoked.
473 */
474 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
475 efi_phys.set_virtual_address_map =
476 (efi_set_virtual_address_map_t *)
477 runtime->set_virtual_address_map;
478 /*
479 * Make efi_get_time can be called before entering
480 * virtual mode.
481 */
482 efi.get_time = phys_efi_get_time;
483 } else
484 printk(KERN_ERR "Could not map the EFI runtime service "
485 "table!\n");
486 early_iounmap(runtime, sizeof(efi_runtime_services_t));
487
488 /* Map the EFI memory map */
489 memmap.map = early_ioremap((unsigned long)memmap.phys_map,
490 memmap.nr_map * memmap.desc_size);
491 if (memmap.map == NULL)
492 printk(KERN_ERR "Could not map the EFI memory map!\n");
493 memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
494
495 if (memmap.desc_size != sizeof(efi_memory_desc_t))
496 printk(KERN_WARNING
497 "Kernel-defined memdesc doesn't match the one from EFI!\n");
498
499 if (add_efi_memmap)
500 do_add_efi_memmap();
501
502#ifdef CONFIG_X86_32
503 x86_platform.get_wallclock = efi_get_time;
504 x86_platform.set_wallclock = efi_set_rtc_mmss;
505#endif
506
507#if EFI_DEBUG
508 print_efi_memmap();
509#endif
510}
511
512void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
513{
514 u64 addr, npages;
515
516 addr = md->virt_addr;
517 npages = md->num_pages;
518
519 memrange_efi_to_native(&addr, &npages);
520
521 if (executable)
522 set_memory_x(addr, npages);
523 else
524 set_memory_nx(addr, npages);
525}
526
527static void __init runtime_code_page_mkexec(void)
528{
529 efi_memory_desc_t *md;
530 void *p;
531
532 /* Make EFI runtime service code area executable */
533 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
534 md = p;
535
536 if (md->type != EFI_RUNTIME_SERVICES_CODE)
537 continue;
538
539 efi_set_executable(md, true);
540 }
541}
542
543/*
544 * This function will switch the EFI runtime services to virtual mode.
545 * Essentially, look through the EFI memmap and map every region that
546 * has the runtime attribute bit set in its memory descriptor and update
547 * that memory descriptor with the virtual address obtained from ioremap().
548 * This enables the runtime services to be called without having to
549 * thunk back into physical mode for every invocation.
550 */
551void __init efi_enter_virtual_mode(void)
552{
553 efi_memory_desc_t *md, *prev_md = NULL;
554 efi_status_t status;
555 unsigned long size;
556 u64 end, systab, addr, npages, end_pfn;
557 void *p, *va, *new_memmap = NULL;
558 int count = 0;
559
560 efi.systab = NULL;
561
562 /* Merge contiguous regions of the same type and attribute */
563 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
564 u64 prev_size;
565 md = p;
566
567 if (!prev_md) {
568 prev_md = md;
569 continue;
570 }
571
572 if (prev_md->type != md->type ||
573 prev_md->attribute != md->attribute) {
574 prev_md = md;
575 continue;
576 }
577
578 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
579
580 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
581 prev_md->num_pages += md->num_pages;
582 md->type = EFI_RESERVED_TYPE;
583 md->attribute = 0;
584 continue;
585 }
586 prev_md = md;
587 }
588
589 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
590 md = p;
591 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
592 md->type != EFI_BOOT_SERVICES_CODE &&
593 md->type != EFI_BOOT_SERVICES_DATA)
594 continue;
595
596 size = md->num_pages << EFI_PAGE_SHIFT;
597 end = md->phys_addr + size;
598
599 end_pfn = PFN_UP(end);
600 if (end_pfn <= max_low_pfn_mapped
601 || (end_pfn > (1UL << (32 - PAGE_SHIFT))
602 && end_pfn <= max_pfn_mapped))
603 va = __va(md->phys_addr);
604 else
605 va = efi_ioremap(md->phys_addr, size, md->type);
606
607 md->virt_addr = (u64) (unsigned long) va;
608
609 if (!va) {
610 printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
611 (unsigned long long)md->phys_addr);
612 continue;
613 }
614
615 if (!(md->attribute & EFI_MEMORY_WB)) {
616 addr = md->virt_addr;
617 npages = md->num_pages;
618 memrange_efi_to_native(&addr, &npages);
619 set_memory_uc(addr, npages);
620 }
621
622 systab = (u64) (unsigned long) efi_phys.systab;
623 if (md->phys_addr <= systab && systab < end) {
624 systab += md->virt_addr - md->phys_addr;
625 efi.systab = (efi_system_table_t *) (unsigned long) systab;
626 }
627 new_memmap = krealloc(new_memmap,
628 (count + 1) * memmap.desc_size,
629 GFP_KERNEL);
630 memcpy(new_memmap + (count * memmap.desc_size), md,
631 memmap.desc_size);
632 count++;
633 }
634
635 BUG_ON(!efi.systab);
636
637 status = phys_efi_set_virtual_address_map(
638 memmap.desc_size * count,
639 memmap.desc_size,
640 memmap.desc_version,
641 (efi_memory_desc_t *)__pa(new_memmap));
642
643 if (status != EFI_SUCCESS) {
644 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
645 "(status=%lx)!\n", status);
646 panic("EFI call to SetVirtualAddressMap() failed!");
647 }
648
649 /*
650 * Thankfully, it does seem that no runtime services other than
651 * SetVirtualAddressMap() will touch boot services code, so we can
652 * get rid of it all at this point
653 */
654 efi_free_boot_services();
655
656 /*
657 * Now that EFI is in virtual mode, update the function
658 * pointers in the runtime service table to the new virtual addresses.
659 *
660 * Call EFI services through wrapper functions.
661 */
662 efi.get_time = virt_efi_get_time;
663 efi.set_time = virt_efi_set_time;
664 efi.get_wakeup_time = virt_efi_get_wakeup_time;
665 efi.set_wakeup_time = virt_efi_set_wakeup_time;
666 efi.get_variable = virt_efi_get_variable;
667 efi.get_next_variable = virt_efi_get_next_variable;
668 efi.set_variable = virt_efi_set_variable;
669 efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
670 efi.reset_system = virt_efi_reset_system;
671 efi.set_virtual_address_map = NULL;
672 if (__supported_pte_mask & _PAGE_NX)
673 runtime_code_page_mkexec();
674 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
675 memmap.map = NULL;
676 kfree(new_memmap);
677}
678
679/*
680 * Convenience functions to obtain memory types and attributes
681 */
682u32 efi_mem_type(unsigned long phys_addr)
683{
684 efi_memory_desc_t *md;
685 void *p;
686
687 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
688 md = p;
689 if ((md->phys_addr <= phys_addr) &&
690 (phys_addr < (md->phys_addr +
691 (md->num_pages << EFI_PAGE_SHIFT))))
692 return md->type;
693 }
694 return 0;
695}
696
697u64 efi_mem_attributes(unsigned long phys_addr)
698{
699 efi_memory_desc_t *md;
700 void *p;
701
702 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
703 md = p;
704 if ((md->phys_addr <= phys_addr) &&
705 (phys_addr < (md->phys_addr +
706 (md->num_pages << EFI_PAGE_SHIFT))))
707 return md->attribute;
708 }
709 return 0;
710}
diff --git a/arch/x86/platform/efi/efi_32.c b/arch/x86/platform/efi/efi_32.c
new file mode 100644
index 000000000000..5cab48ee61a4
--- /dev/null
+++ b/arch/x86/platform/efi/efi_32.c
@@ -0,0 +1,112 @@
1/*
2 * Extensible Firmware Interface
3 *
4 * Based on Extensible Firmware Interface Specification version 1.0
5 *
6 * Copyright (C) 1999 VA Linux Systems
7 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
8 * Copyright (C) 1999-2002 Hewlett-Packard Co.
9 * David Mosberger-Tang <davidm@hpl.hp.com>
10 * Stephane Eranian <eranian@hpl.hp.com>
11 *
12 * All EFI Runtime Services are not implemented yet as EFI only
13 * supports physical mode addressing on SoftSDV. This is to be fixed
14 * in a future version. --drummond 1999-07-20
15 *
16 * Implemented EFI runtime services and virtual mode calls. --davidm
17 *
18 * Goutham Rao: <goutham.rao@intel.com>
19 * Skip non-WB memory and ignore empty memory ranges.
20 */
21
22#include <linux/kernel.h>
23#include <linux/types.h>
24#include <linux/ioport.h>
25#include <linux/efi.h>
26
27#include <asm/io.h>
28#include <asm/page.h>
29#include <asm/pgtable.h>
30#include <asm/tlbflush.h>
31#include <asm/efi.h>
32
33/*
34 * To make EFI call EFI runtime service in physical addressing mode we need
35 * prelog/epilog before/after the invocation to disable interrupt, to
36 * claim EFI runtime service handler exclusively and to duplicate a memory in
37 * low memory space say 0 - 3G.
38 */
39
40static unsigned long efi_rt_eflags;
41static pgd_t efi_bak_pg_dir_pointer[2];
42
43void efi_call_phys_prelog(void)
44{
45 unsigned long cr4;
46 unsigned long temp;
47 struct desc_ptr gdt_descr;
48
49 local_irq_save(efi_rt_eflags);
50
51 /*
52 * If I don't have PAE, I should just duplicate two entries in page
53 * directory. If I have PAE, I just need to duplicate one entry in
54 * page directory.
55 */
56 cr4 = read_cr4_safe();
57
58 if (cr4 & X86_CR4_PAE) {
59 efi_bak_pg_dir_pointer[0].pgd =
60 swapper_pg_dir[pgd_index(0)].pgd;
61 swapper_pg_dir[0].pgd =
62 swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
63 } else {
64 efi_bak_pg_dir_pointer[0].pgd =
65 swapper_pg_dir[pgd_index(0)].pgd;
66 efi_bak_pg_dir_pointer[1].pgd =
67 swapper_pg_dir[pgd_index(0x400000)].pgd;
68 swapper_pg_dir[pgd_index(0)].pgd =
69 swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
70 temp = PAGE_OFFSET + 0x400000;
71 swapper_pg_dir[pgd_index(0x400000)].pgd =
72 swapper_pg_dir[pgd_index(temp)].pgd;
73 }
74
75 /*
76 * After the lock is released, the original page table is restored.
77 */
78 __flush_tlb_all();
79
80 gdt_descr.address = __pa(get_cpu_gdt_table(0));
81 gdt_descr.size = GDT_SIZE - 1;
82 load_gdt(&gdt_descr);
83}
84
85void efi_call_phys_epilog(void)
86{
87 unsigned long cr4;
88 struct desc_ptr gdt_descr;
89
90 gdt_descr.address = (unsigned long)get_cpu_gdt_table(0);
91 gdt_descr.size = GDT_SIZE - 1;
92 load_gdt(&gdt_descr);
93
94 cr4 = read_cr4_safe();
95
96 if (cr4 & X86_CR4_PAE) {
97 swapper_pg_dir[pgd_index(0)].pgd =
98 efi_bak_pg_dir_pointer[0].pgd;
99 } else {
100 swapper_pg_dir[pgd_index(0)].pgd =
101 efi_bak_pg_dir_pointer[0].pgd;
102 swapper_pg_dir[pgd_index(0x400000)].pgd =
103 efi_bak_pg_dir_pointer[1].pgd;
104 }
105
106 /*
107 * After the lock is released, the original page table is restored.
108 */
109 __flush_tlb_all();
110
111 local_irq_restore(efi_rt_eflags);
112}
diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
new file mode 100644
index 000000000000..ac3aa54e2654
--- /dev/null
+++ b/arch/x86/platform/efi/efi_64.c
@@ -0,0 +1,99 @@
1/*
2 * x86_64 specific EFI support functions
3 * Based on Extensible Firmware Interface Specification version 1.0
4 *
5 * Copyright (C) 2005-2008 Intel Co.
6 * Fenghua Yu <fenghua.yu@intel.com>
7 * Bibo Mao <bibo.mao@intel.com>
8 * Chandramouli Narayanan <mouli@linux.intel.com>
9 * Huang Ying <ying.huang@intel.com>
10 *
11 * Code to convert EFI to E820 map has been implemented in elilo bootloader
12 * based on a EFI patch by Edgar Hucek. Based on the E820 map, the page table
13 * is setup appropriately for EFI runtime code.
14 * - mouli 06/14/2007.
15 *
16 */
17
18#include <linux/kernel.h>
19#include <linux/init.h>
20#include <linux/mm.h>
21#include <linux/types.h>
22#include <linux/spinlock.h>
23#include <linux/bootmem.h>
24#include <linux/ioport.h>
25#include <linux/module.h>
26#include <linux/efi.h>
27#include <linux/uaccess.h>
28#include <linux/io.h>
29#include <linux/reboot.h>
30
31#include <asm/setup.h>
32#include <asm/page.h>
33#include <asm/e820.h>
34#include <asm/pgtable.h>
35#include <asm/tlbflush.h>
36#include <asm/proto.h>
37#include <asm/efi.h>
38#include <asm/cacheflush.h>
39#include <asm/fixmap.h>
40
41static pgd_t save_pgd __initdata;
42static unsigned long efi_flags __initdata;
43
44static void __init early_code_mapping_set_exec(int executable)
45{
46 efi_memory_desc_t *md;
47 void *p;
48
49 if (!(__supported_pte_mask & _PAGE_NX))
50 return;
51
52 /* Make EFI service code area executable */
53 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
54 md = p;
55 if (md->type == EFI_RUNTIME_SERVICES_CODE ||
56 md->type == EFI_BOOT_SERVICES_CODE)
57 efi_set_executable(md, executable);
58 }
59}
60
61void __init efi_call_phys_prelog(void)
62{
63 unsigned long vaddress;
64
65 early_code_mapping_set_exec(1);
66 local_irq_save(efi_flags);
67 vaddress = (unsigned long)__va(0x0UL);
68 save_pgd = *pgd_offset_k(0x0UL);
69 set_pgd(pgd_offset_k(0x0UL), *pgd_offset_k(vaddress));
70 __flush_tlb_all();
71}
72
73void __init efi_call_phys_epilog(void)
74{
75 /*
76 * After the lock is released, the original page table is restored.
77 */
78 set_pgd(pgd_offset_k(0x0UL), save_pgd);
79 __flush_tlb_all();
80 local_irq_restore(efi_flags);
81 early_code_mapping_set_exec(0);
82}
83
84void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
85 u32 type)
86{
87 unsigned long last_map_pfn;
88
89 if (type == EFI_MEMORY_MAPPED_IO)
90 return ioremap(phys_addr, size);
91
92 last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
93 if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
94 unsigned long top = last_map_pfn << PAGE_SHIFT;
95 efi_ioremap(top, size - (top - phys_addr), type);
96 }
97
98 return (void __iomem *)__va(phys_addr);
99}
diff --git a/arch/x86/platform/efi/efi_stub_32.S b/arch/x86/platform/efi/efi_stub_32.S
new file mode 100644
index 000000000000..fbe66e626c09
--- /dev/null
+++ b/arch/x86/platform/efi/efi_stub_32.S
@@ -0,0 +1,123 @@
1/*
2 * EFI call stub for IA32.
3 *
4 * This stub allows us to make EFI calls in physical mode with interrupts
5 * turned off.
6 */
7
8#include <linux/linkage.h>
9#include <asm/page_types.h>
10
11/*
12 * efi_call_phys(void *, ...) is a function with variable parameters.
13 * All the callers of this function assure that all the parameters are 4-bytes.
14 */
15
16/*
17 * In gcc calling convention, EBX, ESP, EBP, ESI and EDI are all callee save.
18 * So we'd better save all of them at the beginning of this function and restore
19 * at the end no matter how many we use, because we can not assure EFI runtime
20 * service functions will comply with gcc calling convention, too.
21 */
22
23.text
24ENTRY(efi_call_phys)
25 /*
26 * 0. The function can only be called in Linux kernel. So CS has been
27 * set to 0x0010, DS and SS have been set to 0x0018. In EFI, I found
28 * the values of these registers are the same. And, the corresponding
29 * GDT entries are identical. So I will do nothing about segment reg
30 * and GDT, but change GDT base register in prelog and epilog.
31 */
32
33 /*
34 * 1. Now I am running with EIP = <physical address> + PAGE_OFFSET.
35 * But to make it smoothly switch from virtual mode to flat mode.
36 * The mapping of lower virtual memory has been created in prelog and
37 * epilog.
38 */
39 movl $1f, %edx
40 subl $__PAGE_OFFSET, %edx
41 jmp *%edx
421:
43
44 /*
45 * 2. Now on the top of stack is the return
46 * address in the caller of efi_call_phys(), then parameter 1,
47 * parameter 2, ..., param n. To make things easy, we save the return
48 * address of efi_call_phys in a global variable.
49 */
50 popl %edx
51 movl %edx, saved_return_addr
52 /* get the function pointer into ECX*/
53 popl %ecx
54 movl %ecx, efi_rt_function_ptr
55 movl $2f, %edx
56 subl $__PAGE_OFFSET, %edx
57 pushl %edx
58
59 /*
60 * 3. Clear PG bit in %CR0.
61 */
62 movl %cr0, %edx
63 andl $0x7fffffff, %edx
64 movl %edx, %cr0
65 jmp 1f
661:
67
68 /*
69 * 4. Adjust stack pointer.
70 */
71 subl $__PAGE_OFFSET, %esp
72
73 /*
74 * 5. Call the physical function.
75 */
76 jmp *%ecx
77
782:
79 /*
80 * 6. After EFI runtime service returns, control will return to
81 * following instruction. We'd better readjust stack pointer first.
82 */
83 addl $__PAGE_OFFSET, %esp
84
85 /*
86 * 7. Restore PG bit
87 */
88 movl %cr0, %edx
89 orl $0x80000000, %edx
90 movl %edx, %cr0
91 jmp 1f
921:
93 /*
94 * 8. Now restore the virtual mode from flat mode by
95 * adding EIP with PAGE_OFFSET.
96 */
97 movl $1f, %edx
98 jmp *%edx
991:
100
101 /*
102 * 9. Balance the stack. And because EAX contain the return value,
103 * we'd better not clobber it.
104 */
105 leal efi_rt_function_ptr, %edx
106 movl (%edx), %ecx
107 pushl %ecx
108
109 /*
110 * 10. Push the saved return address onto the stack and return.
111 */
112 leal saved_return_addr, %edx
113 movl (%edx), %ecx
114 pushl %ecx
115 ret
116ENDPROC(efi_call_phys)
117.previous
118
119.data
120saved_return_addr:
121 .long 0
122efi_rt_function_ptr:
123 .long 0
diff --git a/arch/x86/platform/efi/efi_stub_64.S b/arch/x86/platform/efi/efi_stub_64.S
new file mode 100644
index 000000000000..4c07ccab8146
--- /dev/null
+++ b/arch/x86/platform/efi/efi_stub_64.S
@@ -0,0 +1,116 @@
1/*
2 * Function calling ABI conversion from Linux to EFI for x86_64
3 *
4 * Copyright (C) 2007 Intel Corp
5 * Bibo Mao <bibo.mao@intel.com>
6 * Huang Ying <ying.huang@intel.com>
7 */
8
9#include <linux/linkage.h>
10
11#define SAVE_XMM \
12 mov %rsp, %rax; \
13 subq $0x70, %rsp; \
14 and $~0xf, %rsp; \
15 mov %rax, (%rsp); \
16 mov %cr0, %rax; \
17 clts; \
18 mov %rax, 0x8(%rsp); \
19 movaps %xmm0, 0x60(%rsp); \
20 movaps %xmm1, 0x50(%rsp); \
21 movaps %xmm2, 0x40(%rsp); \
22 movaps %xmm3, 0x30(%rsp); \
23 movaps %xmm4, 0x20(%rsp); \
24 movaps %xmm5, 0x10(%rsp)
25
26#define RESTORE_XMM \
27 movaps 0x60(%rsp), %xmm0; \
28 movaps 0x50(%rsp), %xmm1; \
29 movaps 0x40(%rsp), %xmm2; \
30 movaps 0x30(%rsp), %xmm3; \
31 movaps 0x20(%rsp), %xmm4; \
32 movaps 0x10(%rsp), %xmm5; \
33 mov 0x8(%rsp), %rsi; \
34 mov %rsi, %cr0; \
35 mov (%rsp), %rsp
36
37ENTRY(efi_call0)
38 SAVE_XMM
39 subq $32, %rsp
40 call *%rdi
41 addq $32, %rsp
42 RESTORE_XMM
43 ret
44ENDPROC(efi_call0)
45
46ENTRY(efi_call1)
47 SAVE_XMM
48 subq $32, %rsp
49 mov %rsi, %rcx
50 call *%rdi
51 addq $32, %rsp
52 RESTORE_XMM
53 ret
54ENDPROC(efi_call1)
55
56ENTRY(efi_call2)
57 SAVE_XMM
58 subq $32, %rsp
59 mov %rsi, %rcx
60 call *%rdi
61 addq $32, %rsp
62 RESTORE_XMM
63 ret
64ENDPROC(efi_call2)
65
66ENTRY(efi_call3)
67 SAVE_XMM
68 subq $32, %rsp
69 mov %rcx, %r8
70 mov %rsi, %rcx
71 call *%rdi
72 addq $32, %rsp
73 RESTORE_XMM
74 ret
75ENDPROC(efi_call3)
76
77ENTRY(efi_call4)
78 SAVE_XMM
79 subq $32, %rsp
80 mov %r8, %r9
81 mov %rcx, %r8
82 mov %rsi, %rcx
83 call *%rdi
84 addq $32, %rsp
85 RESTORE_XMM
86 ret
87ENDPROC(efi_call4)
88
89ENTRY(efi_call5)
90 SAVE_XMM
91 subq $48, %rsp
92 mov %r9, 32(%rsp)
93 mov %r8, %r9
94 mov %rcx, %r8
95 mov %rsi, %rcx
96 call *%rdi
97 addq $48, %rsp
98 RESTORE_XMM
99 ret
100ENDPROC(efi_call5)
101
102ENTRY(efi_call6)
103 SAVE_XMM
104 mov (%rsp), %rax
105 mov 8(%rax), %rax
106 subq $48, %rsp
107 mov %r9, 32(%rsp)
108 mov %rax, 40(%rsp)
109 mov %r8, %r9
110 mov %rcx, %r8
111 mov %rsi, %rcx
112 call *%rdi
113 addq $48, %rsp
114 RESTORE_XMM
115 ret
116ENDPROC(efi_call6)
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-18 13:00:46 -0400