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 #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>
38 #include <linux/reboot.h>
39 #include <linux/bcd.h>
41 #include <asm/setup.h>
44 #include <asm/cacheflush.h>
45 #include <asm/tlbflush.h>
46 #include <asm/x86_init.h>
52 EXPORT_SYMBOL(efi_enabled
);
57 struct efi_memory_map memmap
;
59 static struct efi efi_phys __initdata
;
60 static efi_system_table_t efi_systab __initdata
;
62 static int __init
setup_noefi(char *arg
)
67 early_param("noefi", setup_noefi
);
70 EXPORT_SYMBOL(add_efi_memmap
);
72 static int __init
setup_add_efi_memmap(char *arg
)
77 early_param("add_efi_memmap", setup_add_efi_memmap
);
80 static efi_status_t
virt_efi_get_time(efi_time_t
*tm
, efi_time_cap_t
*tc
)
82 return efi_call_virt2(get_time
, tm
, tc
);
85 static efi_status_t
virt_efi_set_time(efi_time_t
*tm
)
87 return efi_call_virt1(set_time
, tm
);
90 static efi_status_t
virt_efi_get_wakeup_time(efi_bool_t
*enabled
,
94 return efi_call_virt3(get_wakeup_time
,
95 enabled
, pending
, tm
);
98 static efi_status_t
virt_efi_set_wakeup_time(efi_bool_t enabled
, efi_time_t
*tm
)
100 return efi_call_virt2(set_wakeup_time
,
104 static efi_status_t
virt_efi_get_variable(efi_char16_t
*name
,
107 unsigned long *data_size
,
110 return efi_call_virt5(get_variable
,
115 static efi_status_t
virt_efi_get_next_variable(unsigned long *name_size
,
119 return efi_call_virt3(get_next_variable
,
120 name_size
, name
, vendor
);
123 static efi_status_t
virt_efi_set_variable(efi_char16_t
*name
,
126 unsigned long data_size
,
129 return efi_call_virt5(set_variable
,
134 static efi_status_t
virt_efi_get_next_high_mono_count(u32
*count
)
136 return efi_call_virt1(get_next_high_mono_count
, count
);
139 static void virt_efi_reset_system(int reset_type
,
141 unsigned long data_size
,
144 efi_call_virt4(reset_system
, reset_type
, status
,
148 static 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
)
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();
164 static efi_status_t __init
phys_efi_get_time(efi_time_t
*tm
,
169 efi_call_phys_prelog();
170 status
= efi_call_phys2(efi_phys
.get_time
, tm
, tc
);
171 efi_call_phys_epilog();
175 int efi_set_rtc_mmss(unsigned long nowtime
)
177 int real_seconds
, real_minutes
;
182 status
= efi
.get_time(&eft
, &cap
);
183 if (status
!= EFI_SUCCESS
) {
184 printk(KERN_ERR
"Oops: efitime: can't read time!\n");
188 real_seconds
= nowtime
% 60;
189 real_minutes
= nowtime
/ 60;
190 if (((abs(real_minutes
- eft
.minute
) + 15)/30) & 1)
193 eft
.minute
= real_minutes
;
194 eft
.second
= real_seconds
;
196 status
= efi
.set_time(&eft
);
197 if (status
!= EFI_SUCCESS
) {
198 printk(KERN_ERR
"Oops: efitime: can't write time!\n");
204 unsigned long efi_get_time(void)
210 status
= efi
.get_time(&eft
, &cap
);
211 if (status
!= EFI_SUCCESS
)
212 printk(KERN_ERR
"Oops: efitime: can't read time!\n");
214 return mktime(eft
.year
, eft
.month
, eft
.day
, eft
.hour
,
215 eft
.minute
, eft
.second
);
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.
224 static void __init
do_add_efi_memmap(void)
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
;
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
;
243 e820_type
= E820_RESERVED
;
245 case EFI_ACPI_RECLAIM_MEMORY
:
246 e820_type
= E820_ACPI
;
248 case EFI_ACPI_MEMORY_NVS
:
249 e820_type
= E820_NVS
;
251 case EFI_UNUSABLE_MEMORY
:
252 e820_type
= E820_UNUSABLE
;
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
260 e820_type
= E820_RESERVED
;
263 e820_add_region(start
, size
, e820_type
);
265 sanitize_e820_map(e820
.map
, ARRAY_SIZE(e820
.map
), &e820
.nr_map
);
268 void __init
efi_memblock_x86_reserve_range(void)
273 pmap
= boot_params
.efi_info
.efi_memmap
;
275 pmap
= (boot_params
.efi_info
.efi_memmap
|
276 ((__u64
)boot_params
.efi_info
.efi_memmap_hi
<<32));
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
,
288 static void __init
print_efi_memmap(void)
290 efi_memory_desc_t
*md
;
294 for (p
= memmap
.map
, i
= 0;
296 p
+= memmap
.desc_size
, i
++) {
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
)));
305 #endif /* EFI_DEBUG */
307 void __init
efi_init(void)
309 efi_config_table_t
*config_tables
;
310 efi_runtime_services_t
*runtime
;
312 char vendor
[100] = "unknown";
317 efi_phys
.systab
= (efi_system_table_t
*)boot_params
.efi_info
.efi_systab
;
319 efi_phys
.systab
= (efi_system_table_t
*)
320 (boot_params
.efi_info
.efi_systab
|
321 ((__u64
)boot_params
.efi_info
.efi_systab_hi
<<32));
324 efi
.systab
= early_ioremap((unsigned long)efi_phys
.systab
,
325 sizeof(efi_system_table_t
));
326 if (efi
.systab
== NULL
)
327 printk(KERN_ERR
"Couldn't map the EFI system table!\n");
328 memcpy(&efi_systab
, efi
.systab
, sizeof(efi_system_table_t
));
329 early_iounmap(efi
.systab
, sizeof(efi_system_table_t
));
330 efi
.systab
= &efi_systab
;
333 * Verify the EFI Table
335 if (efi
.systab
->hdr
.signature
!= EFI_SYSTEM_TABLE_SIGNATURE
)
336 printk(KERN_ERR
"EFI system table signature incorrect!\n");
337 if ((efi
.systab
->hdr
.revision
>> 16) == 0)
338 printk(KERN_ERR
"Warning: EFI system table version "
339 "%d.%02d, expected 1.00 or greater!\n",
340 efi
.systab
->hdr
.revision
>> 16,
341 efi
.systab
->hdr
.revision
& 0xffff);
344 * Show what we know for posterity
346 c16
= tmp
= early_ioremap(efi
.systab
->fw_vendor
, 2);
348 for (i
= 0; i
< sizeof(vendor
) - 1 && *c16
; ++i
)
352 printk(KERN_ERR PFX
"Could not map the firmware vendor!\n");
353 early_iounmap(tmp
, 2);
355 printk(KERN_INFO
"EFI v%u.%.02u by %s\n",
356 efi
.systab
->hdr
.revision
>> 16,
357 efi
.systab
->hdr
.revision
& 0xffff, vendor
);
360 * Let's see what config tables the firmware passed to us.
362 config_tables
= early_ioremap(
364 efi
.systab
->nr_tables
* sizeof(efi_config_table_t
));
365 if (config_tables
== NULL
)
366 printk(KERN_ERR
"Could not map EFI Configuration Table!\n");
369 for (i
= 0; i
< efi
.systab
->nr_tables
; i
++) {
370 if (!efi_guidcmp(config_tables
[i
].guid
, MPS_TABLE_GUID
)) {
371 efi
.mps
= config_tables
[i
].table
;
372 printk(" MPS=0x%lx ", config_tables
[i
].table
);
373 } else if (!efi_guidcmp(config_tables
[i
].guid
,
374 ACPI_20_TABLE_GUID
)) {
375 efi
.acpi20
= config_tables
[i
].table
;
376 printk(" ACPI 2.0=0x%lx ", config_tables
[i
].table
);
377 } else if (!efi_guidcmp(config_tables
[i
].guid
,
379 efi
.acpi
= config_tables
[i
].table
;
380 printk(" ACPI=0x%lx ", config_tables
[i
].table
);
381 } else if (!efi_guidcmp(config_tables
[i
].guid
,
382 SMBIOS_TABLE_GUID
)) {
383 efi
.smbios
= config_tables
[i
].table
;
384 printk(" SMBIOS=0x%lx ", config_tables
[i
].table
);
386 } else if (!efi_guidcmp(config_tables
[i
].guid
,
387 UV_SYSTEM_TABLE_GUID
)) {
388 efi
.uv_systab
= config_tables
[i
].table
;
389 printk(" UVsystab=0x%lx ", config_tables
[i
].table
);
391 } else if (!efi_guidcmp(config_tables
[i
].guid
,
393 efi
.hcdp
= config_tables
[i
].table
;
394 printk(" HCDP=0x%lx ", config_tables
[i
].table
);
395 } else if (!efi_guidcmp(config_tables
[i
].guid
,
396 UGA_IO_PROTOCOL_GUID
)) {
397 efi
.uga
= config_tables
[i
].table
;
398 printk(" UGA=0x%lx ", config_tables
[i
].table
);
402 early_iounmap(config_tables
,
403 efi
.systab
->nr_tables
* sizeof(efi_config_table_t
));
406 * Check out the runtime services table. We need to map
407 * the runtime services table so that we can grab the physical
408 * address of several of the EFI runtime functions, needed to
409 * set the firmware into virtual mode.
411 runtime
= early_ioremap((unsigned long)efi
.systab
->runtime
,
412 sizeof(efi_runtime_services_t
));
413 if (runtime
!= NULL
) {
415 * We will only need *early* access to the following
416 * two EFI runtime services before set_virtual_address_map
419 efi_phys
.get_time
= (efi_get_time_t
*)runtime
->get_time
;
420 efi_phys
.set_virtual_address_map
=
421 (efi_set_virtual_address_map_t
*)
422 runtime
->set_virtual_address_map
;
424 * Make efi_get_time can be called before entering
427 efi
.get_time
= phys_efi_get_time
;
429 printk(KERN_ERR
"Could not map the EFI runtime service "
431 early_iounmap(runtime
, sizeof(efi_runtime_services_t
));
433 /* Map the EFI memory map */
434 memmap
.map
= early_ioremap((unsigned long)memmap
.phys_map
,
435 memmap
.nr_map
* memmap
.desc_size
);
436 if (memmap
.map
== NULL
)
437 printk(KERN_ERR
"Could not map the EFI memory map!\n");
438 memmap
.map_end
= memmap
.map
+ (memmap
.nr_map
* memmap
.desc_size
);
440 if (memmap
.desc_size
!= sizeof(efi_memory_desc_t
))
442 "Kernel-defined memdesc doesn't match the one from EFI!\n");
448 x86_platform
.get_wallclock
= efi_get_time
;
449 x86_platform
.set_wallclock
= efi_set_rtc_mmss
;
452 /* Setup for EFI runtime service */
453 reboot_type
= BOOT_EFI
;
460 void __init
efi_set_executable(efi_memory_desc_t
*md
, bool executable
)
464 addr
= md
->virt_addr
;
465 npages
= md
->num_pages
;
467 memrange_efi_to_native(&addr
, &npages
);
470 set_memory_x(addr
, npages
);
472 set_memory_nx(addr
, npages
);
475 static void __init
runtime_code_page_mkexec(void)
477 efi_memory_desc_t
*md
;
480 /* Make EFI runtime service code area executable */
481 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
484 if (md
->type
!= EFI_RUNTIME_SERVICES_CODE
)
487 efi_set_executable(md
, true);
492 * This function will switch the EFI runtime services to virtual mode.
493 * Essentially, look through the EFI memmap and map every region that
494 * has the runtime attribute bit set in its memory descriptor and update
495 * that memory descriptor with the virtual address obtained from ioremap().
496 * This enables the runtime services to be called without having to
497 * thunk back into physical mode for every invocation.
499 void __init
efi_enter_virtual_mode(void)
501 efi_memory_desc_t
*md
, *prev_md
= NULL
;
504 u64 end
, systab
, addr
, npages
, end_pfn
;
505 void *p
, *va
, *new_memmap
= NULL
;
510 /* Merge contiguous regions of the same type and attribute */
511 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
520 if (prev_md
->type
!= md
->type
||
521 prev_md
->attribute
!= md
->attribute
) {
526 prev_size
= prev_md
->num_pages
<< EFI_PAGE_SHIFT
;
528 if (md
->phys_addr
== (prev_md
->phys_addr
+ prev_size
)) {
529 prev_md
->num_pages
+= md
->num_pages
;
530 md
->type
= EFI_RESERVED_TYPE
;
537 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
539 if (!(md
->attribute
& EFI_MEMORY_RUNTIME
))
542 size
= md
->num_pages
<< EFI_PAGE_SHIFT
;
543 end
= md
->phys_addr
+ size
;
545 end_pfn
= PFN_UP(end
);
546 if (end_pfn
<= max_low_pfn_mapped
547 || (end_pfn
> (1UL << (32 - PAGE_SHIFT
))
548 && end_pfn
<= max_pfn_mapped
))
549 va
= __va(md
->phys_addr
);
551 va
= efi_ioremap(md
->phys_addr
, size
, md
->type
);
553 md
->virt_addr
= (u64
) (unsigned long) va
;
556 printk(KERN_ERR PFX
"ioremap of 0x%llX failed!\n",
557 (unsigned long long)md
->phys_addr
);
561 if (!(md
->attribute
& EFI_MEMORY_WB
)) {
562 addr
= md
->virt_addr
;
563 npages
= md
->num_pages
;
564 memrange_efi_to_native(&addr
, &npages
);
565 set_memory_uc(addr
, npages
);
568 systab
= (u64
) (unsigned long) efi_phys
.systab
;
569 if (md
->phys_addr
<= systab
&& systab
< end
) {
570 systab
+= md
->virt_addr
- md
->phys_addr
;
571 efi
.systab
= (efi_system_table_t
*) (unsigned long) systab
;
573 new_memmap
= krealloc(new_memmap
,
574 (count
+ 1) * memmap
.desc_size
,
576 memcpy(new_memmap
+ (count
* memmap
.desc_size
), md
,
583 status
= phys_efi_set_virtual_address_map(
584 memmap
.desc_size
* count
,
587 (efi_memory_desc_t
*)__pa(new_memmap
));
589 if (status
!= EFI_SUCCESS
) {
590 printk(KERN_ALERT
"Unable to switch EFI into virtual mode "
591 "(status=%lx)!\n", status
);
592 panic("EFI call to SetVirtualAddressMap() failed!");
596 * Now that EFI is in virtual mode, update the function
597 * pointers in the runtime service table to the new virtual addresses.
599 * Call EFI services through wrapper functions.
601 efi
.get_time
= virt_efi_get_time
;
602 efi
.set_time
= virt_efi_set_time
;
603 efi
.get_wakeup_time
= virt_efi_get_wakeup_time
;
604 efi
.set_wakeup_time
= virt_efi_set_wakeup_time
;
605 efi
.get_variable
= virt_efi_get_variable
;
606 efi
.get_next_variable
= virt_efi_get_next_variable
;
607 efi
.set_variable
= virt_efi_set_variable
;
608 efi
.get_next_high_mono_count
= virt_efi_get_next_high_mono_count
;
609 efi
.reset_system
= virt_efi_reset_system
;
610 efi
.set_virtual_address_map
= NULL
;
611 if (__supported_pte_mask
& _PAGE_NX
)
612 runtime_code_page_mkexec();
613 early_iounmap(memmap
.map
, memmap
.nr_map
* memmap
.desc_size
);
619 * Convenience functions to obtain memory types and attributes
621 u32
efi_mem_type(unsigned long phys_addr
)
623 efi_memory_desc_t
*md
;
626 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
628 if ((md
->phys_addr
<= phys_addr
) &&
629 (phys_addr
< (md
->phys_addr
+
630 (md
->num_pages
<< EFI_PAGE_SHIFT
))))
636 u64
efi_mem_attributes(unsigned long phys_addr
)
638 efi_memory_desc_t
*md
;
641 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
643 if ((md
->phys_addr
<= phys_addr
) &&
644 (phys_addr
< (md
->phys_addr
+
645 (md
->num_pages
<< EFI_PAGE_SHIFT
))))
646 return md
->attribute
;