2 * Common EFI (Extensible Firmware Interface) support functions
3 * Based on Extensible Firmware Interface Specification version 1.0
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>
16 * Copied from efi_32.c to eliminate the duplicated code between EFI
17 * 32/64 support code. --ying 2007-10-26
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
23 * Implemented EFI runtime services and virtual mode calls. --davidm
25 * Goutham Rao: <goutham.rao@intel.com>
26 * Skip non-WB memory and ignore empty memory ranges.
29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31 #include <linux/kernel.h>
32 #include <linux/init.h>
33 #include <linux/efi.h>
34 #include <linux/efi-bgrt.h>
35 #include <linux/export.h>
36 #include <linux/bootmem.h>
37 #include <linux/memblock.h>
38 #include <linux/spinlock.h>
39 #include <linux/uaccess.h>
40 #include <linux/time.h>
42 #include <linux/reboot.h>
43 #include <linux/bcd.h>
45 #include <asm/setup.h>
48 #include <asm/cacheflush.h>
49 #include <asm/tlbflush.h>
50 #include <asm/x86_init.h>
54 struct efi __read_mostly efi
= {
55 .mps
= EFI_INVALID_TABLE_ADDR
,
56 .acpi
= EFI_INVALID_TABLE_ADDR
,
57 .acpi20
= EFI_INVALID_TABLE_ADDR
,
58 .smbios
= EFI_INVALID_TABLE_ADDR
,
59 .sal_systab
= EFI_INVALID_TABLE_ADDR
,
60 .boot_info
= EFI_INVALID_TABLE_ADDR
,
61 .hcdp
= EFI_INVALID_TABLE_ADDR
,
62 .uga
= EFI_INVALID_TABLE_ADDR
,
63 .uv_systab
= EFI_INVALID_TABLE_ADDR
,
67 struct efi_memory_map memmap
;
69 static struct efi efi_phys __initdata
;
70 static efi_system_table_t efi_systab __initdata
;
72 static inline bool efi_is_native(void)
74 return IS_ENABLED(CONFIG_X86_64
) == efi_enabled(EFI_64BIT
);
77 unsigned long x86_efi_facility
;
80 * Returns 1 if 'facility' is enabled, 0 otherwise.
82 int efi_enabled(int facility
)
84 return test_bit(facility
, &x86_efi_facility
) != 0;
86 EXPORT_SYMBOL(efi_enabled
);
88 static int __init
setup_noefi(char *arg
)
90 clear_bit(EFI_BOOT
, &x86_efi_facility
);
93 early_param("noefi", setup_noefi
);
96 EXPORT_SYMBOL(add_efi_memmap
);
98 static int __init
setup_add_efi_memmap(char *arg
)
103 early_param("add_efi_memmap", setup_add_efi_memmap
);
106 static efi_status_t
virt_efi_get_time(efi_time_t
*tm
, efi_time_cap_t
*tc
)
111 spin_lock_irqsave(&rtc_lock
, flags
);
112 status
= efi_call_virt2(get_time
, tm
, tc
);
113 spin_unlock_irqrestore(&rtc_lock
, flags
);
117 static efi_status_t
virt_efi_set_time(efi_time_t
*tm
)
122 spin_lock_irqsave(&rtc_lock
, flags
);
123 status
= efi_call_virt1(set_time
, tm
);
124 spin_unlock_irqrestore(&rtc_lock
, flags
);
128 static efi_status_t
virt_efi_get_wakeup_time(efi_bool_t
*enabled
,
135 spin_lock_irqsave(&rtc_lock
, flags
);
136 status
= efi_call_virt3(get_wakeup_time
,
137 enabled
, pending
, tm
);
138 spin_unlock_irqrestore(&rtc_lock
, flags
);
142 static efi_status_t
virt_efi_set_wakeup_time(efi_bool_t enabled
, efi_time_t
*tm
)
147 spin_lock_irqsave(&rtc_lock
, flags
);
148 status
= efi_call_virt2(set_wakeup_time
,
150 spin_unlock_irqrestore(&rtc_lock
, flags
);
154 static efi_status_t
virt_efi_get_variable(efi_char16_t
*name
,
157 unsigned long *data_size
,
160 return efi_call_virt5(get_variable
,
165 static efi_status_t
virt_efi_get_next_variable(unsigned long *name_size
,
169 return efi_call_virt3(get_next_variable
,
170 name_size
, name
, vendor
);
173 static efi_status_t
virt_efi_set_variable(efi_char16_t
*name
,
176 unsigned long data_size
,
179 return efi_call_virt5(set_variable
,
184 static efi_status_t
virt_efi_query_variable_info(u32 attr
,
186 u64
*remaining_space
,
187 u64
*max_variable_size
)
189 if (efi
.runtime_version
< EFI_2_00_SYSTEM_TABLE_REVISION
)
190 return EFI_UNSUPPORTED
;
192 return efi_call_virt4(query_variable_info
, attr
, storage_space
,
193 remaining_space
, max_variable_size
);
196 static efi_status_t
virt_efi_get_next_high_mono_count(u32
*count
)
198 return efi_call_virt1(get_next_high_mono_count
, count
);
201 static void virt_efi_reset_system(int reset_type
,
203 unsigned long data_size
,
206 efi_call_virt4(reset_system
, reset_type
, status
,
210 static efi_status_t
virt_efi_update_capsule(efi_capsule_header_t
**capsules
,
212 unsigned long sg_list
)
214 if (efi
.runtime_version
< EFI_2_00_SYSTEM_TABLE_REVISION
)
215 return EFI_UNSUPPORTED
;
217 return efi_call_virt3(update_capsule
, capsules
, count
, sg_list
);
220 static efi_status_t
virt_efi_query_capsule_caps(efi_capsule_header_t
**capsules
,
225 if (efi
.runtime_version
< EFI_2_00_SYSTEM_TABLE_REVISION
)
226 return EFI_UNSUPPORTED
;
228 return efi_call_virt4(query_capsule_caps
, capsules
, count
, max_size
,
232 static efi_status_t __init
phys_efi_set_virtual_address_map(
233 unsigned long memory_map_size
,
234 unsigned long descriptor_size
,
235 u32 descriptor_version
,
236 efi_memory_desc_t
*virtual_map
)
240 efi_call_phys_prelog();
241 status
= efi_call_phys4(efi_phys
.set_virtual_address_map
,
242 memory_map_size
, descriptor_size
,
243 descriptor_version
, virtual_map
);
244 efi_call_phys_epilog();
248 static efi_status_t __init
phys_efi_get_time(efi_time_t
*tm
,
254 spin_lock_irqsave(&rtc_lock
, flags
);
255 efi_call_phys_prelog();
256 status
= efi_call_phys2(efi_phys
.get_time
, virt_to_phys(tm
),
258 efi_call_phys_epilog();
259 spin_unlock_irqrestore(&rtc_lock
, flags
);
263 int efi_set_rtc_mmss(unsigned long nowtime
)
265 int real_seconds
, real_minutes
;
270 status
= efi
.get_time(&eft
, &cap
);
271 if (status
!= EFI_SUCCESS
) {
272 pr_err("Oops: efitime: can't read time!\n");
276 real_seconds
= nowtime
% 60;
277 real_minutes
= nowtime
/ 60;
278 if (((abs(real_minutes
- eft
.minute
) + 15)/30) & 1)
281 eft
.minute
= real_minutes
;
282 eft
.second
= real_seconds
;
284 status
= efi
.set_time(&eft
);
285 if (status
!= EFI_SUCCESS
) {
286 pr_err("Oops: efitime: can't write time!\n");
292 unsigned long efi_get_time(void)
298 status
= efi
.get_time(&eft
, &cap
);
299 if (status
!= EFI_SUCCESS
)
300 pr_err("Oops: efitime: can't read time!\n");
302 return mktime(eft
.year
, eft
.month
, eft
.day
, eft
.hour
,
303 eft
.minute
, eft
.second
);
307 * Tell the kernel about the EFI memory map. This might include
308 * more than the max 128 entries that can fit in the e820 legacy
309 * (zeropage) memory map.
312 static void __init
do_add_efi_memmap(void)
316 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
317 efi_memory_desc_t
*md
= p
;
318 unsigned long long start
= md
->phys_addr
;
319 unsigned long long size
= md
->num_pages
<< EFI_PAGE_SHIFT
;
323 case EFI_LOADER_CODE
:
324 case EFI_LOADER_DATA
:
325 case EFI_BOOT_SERVICES_CODE
:
326 case EFI_BOOT_SERVICES_DATA
:
327 case EFI_CONVENTIONAL_MEMORY
:
328 if (md
->attribute
& EFI_MEMORY_WB
)
329 e820_type
= E820_RAM
;
331 e820_type
= E820_RESERVED
;
333 case EFI_ACPI_RECLAIM_MEMORY
:
334 e820_type
= E820_ACPI
;
336 case EFI_ACPI_MEMORY_NVS
:
337 e820_type
= E820_NVS
;
339 case EFI_UNUSABLE_MEMORY
:
340 e820_type
= E820_UNUSABLE
;
344 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
345 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
346 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
348 e820_type
= E820_RESERVED
;
351 e820_add_region(start
, size
, e820_type
);
353 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
356 int __init
efi_memblock_x86_reserve_range(void)
361 /* Can't handle data above 4GB at this time */
362 if (boot_params
.efi_info
.efi_memmap_hi
) {
363 pr_err("Memory map is above 4GB, disabling EFI.\n");
366 pmap
= boot_params
.efi_info
.efi_memmap
;
368 pmap
= (boot_params
.efi_info
.efi_memmap
|
369 ((__u64
)boot_params
.efi_info
.efi_memmap_hi
<<32));
371 memmap
.phys_map
= (void *)pmap
;
372 memmap
.nr_map
= boot_params
.efi_info
.efi_memmap_size
/
373 boot_params
.efi_info
.efi_memdesc_size
;
374 memmap
.desc_version
= boot_params
.efi_info
.efi_memdesc_version
;
375 memmap
.desc_size
= boot_params
.efi_info
.efi_memdesc_size
;
376 memblock_reserve(pmap
, memmap
.nr_map
* memmap
.desc_size
);
382 static void __init
print_efi_memmap(void)
384 efi_memory_desc_t
*md
;
388 for (p
= memmap
.map
, i
= 0;
390 p
+= memmap
.desc_size
, i
++) {
392 pr_info("mem%02u: type=%u, attr=0x%llx, "
393 "range=[0x%016llx-0x%016llx) (%lluMB)\n",
394 i
, md
->type
, md
->attribute
, md
->phys_addr
,
395 md
->phys_addr
+ (md
->num_pages
<< EFI_PAGE_SHIFT
),
396 (md
->num_pages
>> (20 - EFI_PAGE_SHIFT
)));
399 #endif /* EFI_DEBUG */
401 void __init
efi_reserve_boot_services(void)
405 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
406 efi_memory_desc_t
*md
= p
;
407 u64 start
= md
->phys_addr
;
408 u64 size
= md
->num_pages
<< EFI_PAGE_SHIFT
;
410 if (md
->type
!= EFI_BOOT_SERVICES_CODE
&&
411 md
->type
!= EFI_BOOT_SERVICES_DATA
)
413 /* Only reserve where possible:
414 * - Not within any already allocated areas
415 * - Not over any memory area (really needed, if above?)
416 * - Not within any part of the kernel
417 * - Not the bios reserved area
419 if ((start
+size
>= virt_to_phys(_text
)
420 && start
<= virt_to_phys(_end
)) ||
421 !e820_all_mapped(start
, start
+size
, E820_RAM
) ||
422 memblock_is_region_reserved(start
, size
)) {
423 /* Could not reserve, skip it */
425 memblock_dbg("Could not reserve boot range "
426 "[0x%010llx-0x%010llx]\n",
427 start
, start
+size
-1);
429 memblock_reserve(start
, size
);
433 void __init
efi_unmap_memmap(void)
435 clear_bit(EFI_MEMMAP
, &x86_efi_facility
);
437 early_iounmap(memmap
.map
, memmap
.nr_map
* memmap
.desc_size
);
442 void __init
efi_free_boot_services(void)
446 if (!efi_is_native())
449 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
450 efi_memory_desc_t
*md
= p
;
451 unsigned long long start
= md
->phys_addr
;
452 unsigned long long size
= md
->num_pages
<< EFI_PAGE_SHIFT
;
454 if (md
->type
!= EFI_BOOT_SERVICES_CODE
&&
455 md
->type
!= EFI_BOOT_SERVICES_DATA
)
458 /* Could not reserve boot area */
462 free_bootmem_late(start
, size
);
468 static int __init
efi_systab_init(void *phys
)
470 if (efi_enabled(EFI_64BIT
)) {
471 efi_system_table_64_t
*systab64
;
474 systab64
= early_ioremap((unsigned long)phys
,
476 if (systab64
== NULL
) {
477 pr_err("Couldn't map the system table!\n");
481 efi_systab
.hdr
= systab64
->hdr
;
482 efi_systab
.fw_vendor
= systab64
->fw_vendor
;
483 tmp
|= systab64
->fw_vendor
;
484 efi_systab
.fw_revision
= systab64
->fw_revision
;
485 efi_systab
.con_in_handle
= systab64
->con_in_handle
;
486 tmp
|= systab64
->con_in_handle
;
487 efi_systab
.con_in
= systab64
->con_in
;
488 tmp
|= systab64
->con_in
;
489 efi_systab
.con_out_handle
= systab64
->con_out_handle
;
490 tmp
|= systab64
->con_out_handle
;
491 efi_systab
.con_out
= systab64
->con_out
;
492 tmp
|= systab64
->con_out
;
493 efi_systab
.stderr_handle
= systab64
->stderr_handle
;
494 tmp
|= systab64
->stderr_handle
;
495 efi_systab
.stderr
= systab64
->stderr
;
496 tmp
|= systab64
->stderr
;
497 efi_systab
.runtime
= (void *)(unsigned long)systab64
->runtime
;
498 tmp
|= systab64
->runtime
;
499 efi_systab
.boottime
= (void *)(unsigned long)systab64
->boottime
;
500 tmp
|= systab64
->boottime
;
501 efi_systab
.nr_tables
= systab64
->nr_tables
;
502 efi_systab
.tables
= systab64
->tables
;
503 tmp
|= systab64
->tables
;
505 early_iounmap(systab64
, sizeof(*systab64
));
508 pr_err("EFI data located above 4GB, disabling EFI.\n");
513 efi_system_table_32_t
*systab32
;
515 systab32
= early_ioremap((unsigned long)phys
,
517 if (systab32
== NULL
) {
518 pr_err("Couldn't map the system table!\n");
522 efi_systab
.hdr
= systab32
->hdr
;
523 efi_systab
.fw_vendor
= systab32
->fw_vendor
;
524 efi_systab
.fw_revision
= systab32
->fw_revision
;
525 efi_systab
.con_in_handle
= systab32
->con_in_handle
;
526 efi_systab
.con_in
= systab32
->con_in
;
527 efi_systab
.con_out_handle
= systab32
->con_out_handle
;
528 efi_systab
.con_out
= systab32
->con_out
;
529 efi_systab
.stderr_handle
= systab32
->stderr_handle
;
530 efi_systab
.stderr
= systab32
->stderr
;
531 efi_systab
.runtime
= (void *)(unsigned long)systab32
->runtime
;
532 efi_systab
.boottime
= (void *)(unsigned long)systab32
->boottime
;
533 efi_systab
.nr_tables
= systab32
->nr_tables
;
534 efi_systab
.tables
= systab32
->tables
;
536 early_iounmap(systab32
, sizeof(*systab32
));
539 efi
.systab
= &efi_systab
;
542 * Verify the EFI Table
544 if (efi
.systab
->hdr
.signature
!= EFI_SYSTEM_TABLE_SIGNATURE
) {
545 pr_err("System table signature incorrect!\n");
548 if ((efi
.systab
->hdr
.revision
>> 16) == 0)
549 pr_err("Warning: System table version "
550 "%d.%02d, expected 1.00 or greater!\n",
551 efi
.systab
->hdr
.revision
>> 16,
552 efi
.systab
->hdr
.revision
& 0xffff);
557 static int __init
efi_config_init(u64 tables
, int nr_tables
)
559 void *config_tables
, *tablep
;
562 if (efi_enabled(EFI_64BIT
))
563 sz
= sizeof(efi_config_table_64_t
);
565 sz
= sizeof(efi_config_table_32_t
);
568 * Let's see what config tables the firmware passed to us.
570 config_tables
= early_ioremap(tables
, nr_tables
* sz
);
571 if (config_tables
== NULL
) {
572 pr_err("Could not map Configuration table!\n");
576 tablep
= config_tables
;
578 for (i
= 0; i
< efi
.systab
->nr_tables
; i
++) {
582 if (efi_enabled(EFI_64BIT
)) {
584 guid
= ((efi_config_table_64_t
*)tablep
)->guid
;
585 table64
= ((efi_config_table_64_t
*)tablep
)->table
;
590 pr_err("Table located above 4GB, disabling EFI.\n");
591 early_iounmap(config_tables
,
592 efi
.systab
->nr_tables
* sz
);
597 guid
= ((efi_config_table_32_t
*)tablep
)->guid
;
598 table
= ((efi_config_table_32_t
*)tablep
)->table
;
600 if (!efi_guidcmp(guid
, MPS_TABLE_GUID
)) {
602 pr_cont(" MPS=0x%lx ", table
);
603 } else if (!efi_guidcmp(guid
, ACPI_20_TABLE_GUID
)) {
605 pr_cont(" ACPI 2.0=0x%lx ", table
);
606 } else if (!efi_guidcmp(guid
, ACPI_TABLE_GUID
)) {
608 pr_cont(" ACPI=0x%lx ", table
);
609 } else if (!efi_guidcmp(guid
, SMBIOS_TABLE_GUID
)) {
611 pr_cont(" SMBIOS=0x%lx ", table
);
613 } else if (!efi_guidcmp(guid
, UV_SYSTEM_TABLE_GUID
)) {
614 efi
.uv_systab
= table
;
615 pr_cont(" UVsystab=0x%lx ", table
);
617 } else if (!efi_guidcmp(guid
, HCDP_TABLE_GUID
)) {
619 pr_cont(" HCDP=0x%lx ", table
);
620 } else if (!efi_guidcmp(guid
, UGA_IO_PROTOCOL_GUID
)) {
622 pr_cont(" UGA=0x%lx ", table
);
627 early_iounmap(config_tables
, efi
.systab
->nr_tables
* sz
);
631 static int __init
efi_runtime_init(void)
633 efi_runtime_services_t
*runtime
;
636 * Check out the runtime services table. We need to map
637 * the runtime services table so that we can grab the physical
638 * address of several of the EFI runtime functions, needed to
639 * set the firmware into virtual mode.
641 runtime
= early_ioremap((unsigned long)efi
.systab
->runtime
,
642 sizeof(efi_runtime_services_t
));
644 pr_err("Could not map the runtime service table!\n");
648 * We will only need *early* access to the following
649 * two EFI runtime services before set_virtual_address_map
652 efi_phys
.get_time
= (efi_get_time_t
*)runtime
->get_time
;
653 efi_phys
.set_virtual_address_map
=
654 (efi_set_virtual_address_map_t
*)
655 runtime
->set_virtual_address_map
;
657 * Make efi_get_time can be called before entering
660 efi
.get_time
= phys_efi_get_time
;
661 early_iounmap(runtime
, sizeof(efi_runtime_services_t
));
666 static int __init
efi_memmap_init(void)
668 /* Map the EFI memory map */
669 memmap
.map
= early_ioremap((unsigned long)memmap
.phys_map
,
670 memmap
.nr_map
* memmap
.desc_size
);
671 if (memmap
.map
== NULL
) {
672 pr_err("Could not map the memory map!\n");
675 memmap
.map_end
= memmap
.map
+ (memmap
.nr_map
* memmap
.desc_size
);
683 void __init
efi_init(void)
686 char vendor
[100] = "unknown";
691 if (boot_params
.efi_info
.efi_systab_hi
||
692 boot_params
.efi_info
.efi_memmap_hi
) {
693 pr_info("Table located above 4GB, disabling EFI.\n");
696 efi_phys
.systab
= (efi_system_table_t
*)boot_params
.efi_info
.efi_systab
;
698 efi_phys
.systab
= (efi_system_table_t
*)
699 (boot_params
.efi_info
.efi_systab
|
700 ((__u64
)boot_params
.efi_info
.efi_systab_hi
<<32));
703 if (efi_systab_init(efi_phys
.systab
))
706 set_bit(EFI_SYSTEM_TABLES
, &x86_efi_facility
);
709 * Show what we know for posterity
711 c16
= tmp
= early_ioremap(efi
.systab
->fw_vendor
, 2);
713 for (i
= 0; i
< sizeof(vendor
) - 1 && *c16
; ++i
)
717 pr_err("Could not map the firmware vendor!\n");
718 early_iounmap(tmp
, 2);
720 pr_info("EFI v%u.%.02u by %s\n",
721 efi
.systab
->hdr
.revision
>> 16,
722 efi
.systab
->hdr
.revision
& 0xffff, vendor
);
724 if (efi_config_init(efi
.systab
->tables
, efi
.systab
->nr_tables
))
727 set_bit(EFI_CONFIG_TABLES
, &x86_efi_facility
);
730 * Note: We currently don't support runtime services on an EFI
731 * that doesn't match the kernel 32/64-bit mode.
734 if (!efi_is_native())
735 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
737 if (efi_runtime_init())
739 set_bit(EFI_RUNTIME_SERVICES
, &x86_efi_facility
);
742 if (efi_memmap_init())
745 set_bit(EFI_MEMMAP
, &x86_efi_facility
);
748 if (efi_is_native()) {
749 x86_platform
.get_wallclock
= efi_get_time
;
750 x86_platform
.set_wallclock
= efi_set_rtc_mmss
;
759 void __init
efi_late_init(void)
764 void __init
efi_set_executable(efi_memory_desc_t
*md
, bool executable
)
768 addr
= md
->virt_addr
;
769 npages
= md
->num_pages
;
771 memrange_efi_to_native(&addr
, &npages
);
774 set_memory_x(addr
, npages
);
776 set_memory_nx(addr
, npages
);
779 static void __init
runtime_code_page_mkexec(void)
781 efi_memory_desc_t
*md
;
784 /* Make EFI runtime service code area executable */
785 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
788 if (md
->type
!= EFI_RUNTIME_SERVICES_CODE
)
791 efi_set_executable(md
, true);
796 * We can't ioremap data in EFI boot services RAM, because we've already mapped
797 * it as RAM. So, look it up in the existing EFI memory map instead. Only
798 * callable after efi_enter_virtual_mode and before efi_free_boot_services.
800 void __iomem
*efi_lookup_mapped_addr(u64 phys_addr
)
803 if (WARN_ON(!memmap
.map
))
805 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
806 efi_memory_desc_t
*md
= p
;
807 u64 size
= md
->num_pages
<< EFI_PAGE_SHIFT
;
808 u64 end
= md
->phys_addr
+ size
;
809 if (!(md
->attribute
& EFI_MEMORY_RUNTIME
) &&
810 md
->type
!= EFI_BOOT_SERVICES_CODE
&&
811 md
->type
!= EFI_BOOT_SERVICES_DATA
)
815 if (phys_addr
>= md
->phys_addr
&& phys_addr
< end
) {
816 phys_addr
+= md
->virt_addr
- md
->phys_addr
;
817 return (__force
void __iomem
*)(unsigned long)phys_addr
;
823 void efi_memory_uc(u64 addr
, unsigned long size
)
825 unsigned long page_shift
= 1UL << EFI_PAGE_SHIFT
;
828 npages
= round_up(size
, page_shift
) / page_shift
;
829 memrange_efi_to_native(&addr
, &npages
);
830 set_memory_uc(addr
, npages
);
834 * This function will switch the EFI runtime services to virtual mode.
835 * Essentially, look through the EFI memmap and map every region that
836 * has the runtime attribute bit set in its memory descriptor and update
837 * that memory descriptor with the virtual address obtained from ioremap().
838 * This enables the runtime services to be called without having to
839 * thunk back into physical mode for every invocation.
841 void __init
efi_enter_virtual_mode(void)
843 efi_memory_desc_t
*md
, *prev_md
= NULL
;
846 u64 end
, systab
, end_pfn
;
847 void *p
, *va
, *new_memmap
= NULL
;
853 * We don't do virtual mode, since we don't do runtime services, on
857 if (!efi_is_native()) {
862 /* Merge contiguous regions of the same type and attribute */
863 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
872 if (prev_md
->type
!= md
->type
||
873 prev_md
->attribute
!= md
->attribute
) {
878 prev_size
= prev_md
->num_pages
<< EFI_PAGE_SHIFT
;
880 if (md
->phys_addr
== (prev_md
->phys_addr
+ prev_size
)) {
881 prev_md
->num_pages
+= md
->num_pages
;
882 md
->type
= EFI_RESERVED_TYPE
;
889 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
891 if (!(md
->attribute
& EFI_MEMORY_RUNTIME
) &&
892 md
->type
!= EFI_BOOT_SERVICES_CODE
&&
893 md
->type
!= EFI_BOOT_SERVICES_DATA
)
896 size
= md
->num_pages
<< EFI_PAGE_SHIFT
;
897 end
= md
->phys_addr
+ size
;
899 end_pfn
= PFN_UP(end
);
900 if (end_pfn
<= max_low_pfn_mapped
901 || (end_pfn
> (1UL << (32 - PAGE_SHIFT
))
902 && end_pfn
<= max_pfn_mapped
)) {
903 va
= __va(md
->phys_addr
);
905 if (!(md
->attribute
& EFI_MEMORY_WB
))
906 efi_memory_uc((u64
)(unsigned long)va
, size
);
908 va
= efi_ioremap(md
->phys_addr
, size
,
909 md
->type
, md
->attribute
);
911 md
->virt_addr
= (u64
) (unsigned long) va
;
914 pr_err("ioremap of 0x%llX failed!\n",
915 (unsigned long long)md
->phys_addr
);
919 systab
= (u64
) (unsigned long) efi_phys
.systab
;
920 if (md
->phys_addr
<= systab
&& systab
< end
) {
921 systab
+= md
->virt_addr
- md
->phys_addr
;
922 efi
.systab
= (efi_system_table_t
*) (unsigned long) systab
;
924 new_memmap
= krealloc(new_memmap
,
925 (count
+ 1) * memmap
.desc_size
,
927 memcpy(new_memmap
+ (count
* memmap
.desc_size
), md
,
934 status
= phys_efi_set_virtual_address_map(
935 memmap
.desc_size
* count
,
938 (efi_memory_desc_t
*)__pa(new_memmap
));
940 if (status
!= EFI_SUCCESS
) {
941 pr_alert("Unable to switch EFI into virtual mode "
942 "(status=%lx)!\n", status
);
943 panic("EFI call to SetVirtualAddressMap() failed!");
947 * Now that EFI is in virtual mode, update the function
948 * pointers in the runtime service table to the new virtual addresses.
950 * Call EFI services through wrapper functions.
952 efi
.runtime_version
= efi_systab
.hdr
.revision
;
953 efi
.get_time
= virt_efi_get_time
;
954 efi
.set_time
= virt_efi_set_time
;
955 efi
.get_wakeup_time
= virt_efi_get_wakeup_time
;
956 efi
.set_wakeup_time
= virt_efi_set_wakeup_time
;
957 efi
.get_variable
= virt_efi_get_variable
;
958 efi
.get_next_variable
= virt_efi_get_next_variable
;
959 efi
.set_variable
= virt_efi_set_variable
;
960 efi
.get_next_high_mono_count
= virt_efi_get_next_high_mono_count
;
961 efi
.reset_system
= virt_efi_reset_system
;
962 efi
.set_virtual_address_map
= NULL
;
963 efi
.query_variable_info
= virt_efi_query_variable_info
;
964 efi
.update_capsule
= virt_efi_update_capsule
;
965 efi
.query_capsule_caps
= virt_efi_query_capsule_caps
;
966 if (__supported_pte_mask
& _PAGE_NX
)
967 runtime_code_page_mkexec();
973 * Convenience functions to obtain memory types and attributes
975 u32
efi_mem_type(unsigned long phys_addr
)
977 efi_memory_desc_t
*md
;
980 if (!efi_enabled(EFI_MEMMAP
))
983 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
985 if ((md
->phys_addr
<= phys_addr
) &&
986 (phys_addr
< (md
->phys_addr
+
987 (md
->num_pages
<< EFI_PAGE_SHIFT
))))
993 u64
efi_mem_attributes(unsigned long phys_addr
)
995 efi_memory_desc_t
*md
;
998 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
1000 if ((md
->phys_addr
<= phys_addr
) &&
1001 (phys_addr
< (md
->phys_addr
+
1002 (md
->num_pages
<< EFI_PAGE_SHIFT
))))
1003 return md
->attribute
;