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/spinlock.h>
34 #include <linux/uaccess.h>
35 #include <linux/time.h>
37 #include <linux/reboot.h>
38 #include <linux/bcd.h>
40 #include <asm/setup.h>
48 EXPORT_SYMBOL(efi_enabled
);
53 struct efi_memory_map memmap
;
55 struct efi efi_phys __initdata
;
56 static efi_system_table_t efi_systab __initdata
;
58 static int __init
setup_noefi(char *arg
)
63 early_param("noefi", setup_noefi
);
65 static efi_status_t
virt_efi_get_time(efi_time_t
*tm
, efi_time_cap_t
*tc
)
67 return efi_call_virt2(get_time
, tm
, tc
);
70 static efi_status_t
virt_efi_set_time(efi_time_t
*tm
)
72 return efi_call_virt1(set_time
, tm
);
75 static efi_status_t
virt_efi_get_wakeup_time(efi_bool_t
*enabled
,
79 return efi_call_virt3(get_wakeup_time
,
80 enabled
, pending
, tm
);
83 static efi_status_t
virt_efi_set_wakeup_time(efi_bool_t enabled
, efi_time_t
*tm
)
85 return efi_call_virt2(set_wakeup_time
,
89 static efi_status_t
virt_efi_get_variable(efi_char16_t
*name
,
92 unsigned long *data_size
,
95 return efi_call_virt5(get_variable
,
100 static efi_status_t
virt_efi_get_next_variable(unsigned long *name_size
,
104 return efi_call_virt3(get_next_variable
,
105 name_size
, name
, vendor
);
108 static efi_status_t
virt_efi_set_variable(efi_char16_t
*name
,
111 unsigned long data_size
,
114 return efi_call_virt5(set_variable
,
119 static efi_status_t
virt_efi_get_next_high_mono_count(u32
*count
)
121 return efi_call_virt1(get_next_high_mono_count
, count
);
124 static void virt_efi_reset_system(int reset_type
,
126 unsigned long data_size
,
129 efi_call_virt4(reset_system
, reset_type
, status
,
133 static efi_status_t
virt_efi_set_virtual_address_map(
134 unsigned long memory_map_size
,
135 unsigned long descriptor_size
,
136 u32 descriptor_version
,
137 efi_memory_desc_t
*virtual_map
)
139 return efi_call_virt4(set_virtual_address_map
,
140 memory_map_size
, descriptor_size
,
141 descriptor_version
, virtual_map
);
144 static efi_status_t __init
phys_efi_set_virtual_address_map(
145 unsigned long memory_map_size
,
146 unsigned long descriptor_size
,
147 u32 descriptor_version
,
148 efi_memory_desc_t
*virtual_map
)
152 efi_call_phys_prelog();
153 status
= efi_call_phys4(efi_phys
.set_virtual_address_map
,
154 memory_map_size
, descriptor_size
,
155 descriptor_version
, virtual_map
);
156 efi_call_phys_epilog();
160 static efi_status_t __init
phys_efi_get_time(efi_time_t
*tm
,
165 efi_call_phys_prelog();
166 status
= efi_call_phys2(efi_phys
.get_time
, tm
, tc
);
167 efi_call_phys_epilog();
171 int efi_set_rtc_mmss(unsigned long nowtime
)
173 int real_seconds
, real_minutes
;
178 status
= efi
.get_time(&eft
, &cap
);
179 if (status
!= EFI_SUCCESS
) {
180 printk(KERN_ERR
"Oops: efitime: can't read time!\n");
184 real_seconds
= nowtime
% 60;
185 real_minutes
= nowtime
/ 60;
186 if (((abs(real_minutes
- eft
.minute
) + 15)/30) & 1)
189 eft
.minute
= real_minutes
;
190 eft
.second
= real_seconds
;
192 status
= efi
.set_time(&eft
);
193 if (status
!= EFI_SUCCESS
) {
194 printk(KERN_ERR
"Oops: efitime: can't write time!\n");
200 unsigned long efi_get_time(void)
206 status
= efi
.get_time(&eft
, &cap
);
207 if (status
!= EFI_SUCCESS
)
208 printk(KERN_ERR
"Oops: efitime: can't read time!\n");
210 return mktime(eft
.year
, eft
.month
, eft
.day
, eft
.hour
,
211 eft
.minute
, eft
.second
);
215 static void __init
print_efi_memmap(void)
217 efi_memory_desc_t
*md
;
221 for (p
= memmap
.map
, i
= 0;
223 p
+= memmap
.desc_size
, i
++) {
225 printk(KERN_INFO PFX
"mem%02u: type=%u, attr=0x%llx, "
226 "range=[0x%016llx-0x%016llx) (%lluMB)\n",
227 i
, md
->type
, md
->attribute
, md
->phys_addr
,
228 md
->phys_addr
+ (md
->num_pages
<< EFI_PAGE_SHIFT
),
229 (md
->num_pages
>> (20 - EFI_PAGE_SHIFT
)));
232 #endif /* EFI_DEBUG */
234 void __init
efi_init(void)
236 efi_config_table_t
*config_tables
;
237 efi_runtime_services_t
*runtime
;
239 char vendor
[100] = "unknown";
244 efi_phys
.systab
= (efi_system_table_t
*)boot_params
.efi_info
.efi_systab
;
245 memmap
.phys_map
= (void *)boot_params
.efi_info
.efi_memmap
;
247 efi_phys
.systab
= (efi_system_table_t
*)
248 (boot_params
.efi_info
.efi_systab
|
249 ((__u64
)boot_params
.efi_info
.efi_systab_hi
<<32));
250 memmap
.phys_map
= (void *)
251 (boot_params
.efi_info
.efi_memmap
|
252 ((__u64
)boot_params
.efi_info
.efi_memmap_hi
<<32));
254 memmap
.nr_map
= boot_params
.efi_info
.efi_memmap_size
/
255 boot_params
.efi_info
.efi_memdesc_size
;
256 memmap
.desc_version
= boot_params
.efi_info
.efi_memdesc_version
;
257 memmap
.desc_size
= boot_params
.efi_info
.efi_memdesc_size
;
259 efi
.systab
= early_ioremap((unsigned long)efi_phys
.systab
,
260 sizeof(efi_system_table_t
));
261 if (efi
.systab
== NULL
)
262 printk(KERN_ERR
"Couldn't map the EFI system table!\n");
263 memcpy(&efi_systab
, efi
.systab
, sizeof(efi_system_table_t
));
264 early_iounmap(efi
.systab
, sizeof(efi_system_table_t
));
265 efi
.systab
= &efi_systab
;
268 * Verify the EFI Table
270 if (efi
.systab
->hdr
.signature
!= EFI_SYSTEM_TABLE_SIGNATURE
)
271 printk(KERN_ERR
"EFI system table signature incorrect!\n");
272 if ((efi
.systab
->hdr
.revision
>> 16) == 0)
273 printk(KERN_ERR
"Warning: EFI system table version "
274 "%d.%02d, expected 1.00 or greater!\n",
275 efi
.systab
->hdr
.revision
>> 16,
276 efi
.systab
->hdr
.revision
& 0xffff);
279 * Show what we know for posterity
281 c16
= tmp
= early_ioremap(efi
.systab
->fw_vendor
, 2);
283 for (i
= 0; i
< sizeof(vendor
) && *c16
; ++i
)
287 printk(KERN_ERR PFX
"Could not map the firmware vendor!\n");
288 early_iounmap(tmp
, 2);
290 printk(KERN_INFO
"EFI v%u.%.02u by %s \n",
291 efi
.systab
->hdr
.revision
>> 16,
292 efi
.systab
->hdr
.revision
& 0xffff, vendor
);
295 * Let's see what config tables the firmware passed to us.
297 config_tables
= early_ioremap(
299 efi
.systab
->nr_tables
* sizeof(efi_config_table_t
));
300 if (config_tables
== NULL
)
301 printk(KERN_ERR
"Could not map EFI Configuration Table!\n");
304 for (i
= 0; i
< efi
.systab
->nr_tables
; i
++) {
305 if (!efi_guidcmp(config_tables
[i
].guid
, MPS_TABLE_GUID
)) {
306 efi
.mps
= config_tables
[i
].table
;
307 printk(" MPS=0x%lx ", config_tables
[i
].table
);
308 } else if (!efi_guidcmp(config_tables
[i
].guid
,
309 ACPI_20_TABLE_GUID
)) {
310 efi
.acpi20
= config_tables
[i
].table
;
311 printk(" ACPI 2.0=0x%lx ", config_tables
[i
].table
);
312 } else if (!efi_guidcmp(config_tables
[i
].guid
,
314 efi
.acpi
= config_tables
[i
].table
;
315 printk(" ACPI=0x%lx ", config_tables
[i
].table
);
316 } else if (!efi_guidcmp(config_tables
[i
].guid
,
317 SMBIOS_TABLE_GUID
)) {
318 efi
.smbios
= config_tables
[i
].table
;
319 printk(" SMBIOS=0x%lx ", config_tables
[i
].table
);
320 } else if (!efi_guidcmp(config_tables
[i
].guid
,
322 efi
.hcdp
= config_tables
[i
].table
;
323 printk(" HCDP=0x%lx ", config_tables
[i
].table
);
324 } else if (!efi_guidcmp(config_tables
[i
].guid
,
325 UGA_IO_PROTOCOL_GUID
)) {
326 efi
.uga
= config_tables
[i
].table
;
327 printk(" UGA=0x%lx ", config_tables
[i
].table
);
331 early_iounmap(config_tables
,
332 efi
.systab
->nr_tables
* sizeof(efi_config_table_t
));
335 * Check out the runtime services table. We need to map
336 * the runtime services table so that we can grab the physical
337 * address of several of the EFI runtime functions, needed to
338 * set the firmware into virtual mode.
340 runtime
= early_ioremap((unsigned long)efi
.systab
->runtime
,
341 sizeof(efi_runtime_services_t
));
342 if (runtime
!= NULL
) {
344 * We will only need *early* access to the following
345 * two EFI runtime services before set_virtual_address_map
348 efi_phys
.get_time
= (efi_get_time_t
*)runtime
->get_time
;
349 efi_phys
.set_virtual_address_map
=
350 (efi_set_virtual_address_map_t
*)
351 runtime
->set_virtual_address_map
;
353 * Make efi_get_time can be called before entering
356 efi
.get_time
= phys_efi_get_time
;
358 printk(KERN_ERR
"Could not map the EFI runtime service "
360 early_iounmap(runtime
, sizeof(efi_runtime_services_t
));
362 /* Map the EFI memory map */
363 memmap
.map
= early_ioremap((unsigned long)memmap
.phys_map
,
364 memmap
.nr_map
* memmap
.desc_size
);
365 if (memmap
.map
== NULL
)
366 printk(KERN_ERR
"Could not map the EFI memory map!\n");
367 memmap
.map_end
= memmap
.map
+ (memmap
.nr_map
* memmap
.desc_size
);
368 if (memmap
.desc_size
!= sizeof(efi_memory_desc_t
))
369 printk(KERN_WARNING
"Kernel-defined memdesc"
370 "doesn't match the one from EFI!\n");
373 /* Setup for EFI runtime service */
374 reboot_type
= BOOT_EFI
;
383 * This function will switch the EFI runtime services to virtual mode.
384 * Essentially, look through the EFI memmap and map every region that
385 * has the runtime attribute bit set in its memory descriptor and update
386 * that memory descriptor with the virtual address obtained from ioremap().
387 * This enables the runtime services to be called without having to
388 * thunk back into physical mode for every invocation.
390 void __init
efi_enter_virtual_mode(void)
392 efi_memory_desc_t
*md
;
398 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
400 if (!(md
->attribute
& EFI_MEMORY_RUNTIME
))
402 if ((md
->attribute
& EFI_MEMORY_WB
) &&
403 (((md
->phys_addr
+ (md
->num_pages
<<EFI_PAGE_SHIFT
)) >>
404 PAGE_SHIFT
) < end_pfn_map
))
405 md
->virt_addr
= (unsigned long)__va(md
->phys_addr
);
407 md
->virt_addr
= (unsigned long)
408 efi_ioremap(md
->phys_addr
,
409 md
->num_pages
<< EFI_PAGE_SHIFT
);
411 printk(KERN_ERR PFX
"ioremap of 0x%llX failed!\n",
412 (unsigned long long)md
->phys_addr
);
413 end
= md
->phys_addr
+ (md
->num_pages
<< EFI_PAGE_SHIFT
);
414 if ((md
->phys_addr
<= (unsigned long)efi_phys
.systab
) &&
415 ((unsigned long)efi_phys
.systab
< end
))
416 efi
.systab
= (efi_system_table_t
*)(unsigned long)
417 (md
->virt_addr
- md
->phys_addr
+
418 (unsigned long)efi_phys
.systab
);
423 status
= phys_efi_set_virtual_address_map(
424 memmap
.desc_size
* memmap
.nr_map
,
429 if (status
!= EFI_SUCCESS
) {
430 printk(KERN_ALERT
"Unable to switch EFI into virtual mode "
431 "(status=%lx)!\n", status
);
432 panic("EFI call to SetVirtualAddressMap() failed!");
436 * Now that EFI is in virtual mode, update the function
437 * pointers in the runtime service table to the new virtual addresses.
439 * Call EFI services through wrapper functions.
441 efi
.get_time
= virt_efi_get_time
;
442 efi
.set_time
= virt_efi_set_time
;
443 efi
.get_wakeup_time
= virt_efi_get_wakeup_time
;
444 efi
.set_wakeup_time
= virt_efi_set_wakeup_time
;
445 efi
.get_variable
= virt_efi_get_variable
;
446 efi
.get_next_variable
= virt_efi_get_next_variable
;
447 efi
.set_variable
= virt_efi_set_variable
;
448 efi
.get_next_high_mono_count
= virt_efi_get_next_high_mono_count
;
449 efi
.reset_system
= virt_efi_reset_system
;
450 efi
.set_virtual_address_map
= virt_efi_set_virtual_address_map
;
452 runtime_code_page_mkexec();
457 * Convenience functions to obtain memory types and attributes
459 u32
efi_mem_type(unsigned long phys_addr
)
461 efi_memory_desc_t
*md
;
464 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
466 if ((md
->phys_addr
<= phys_addr
) &&
467 (phys_addr
< (md
->phys_addr
+
468 (md
->num_pages
<< EFI_PAGE_SHIFT
))))
474 u64
efi_mem_attributes(unsigned long phys_addr
)
476 efi_memory_desc_t
*md
;
479 for (p
= memmap
.map
; p
< memmap
.map_end
; p
+= memmap
.desc_size
) {
481 if ((md
->phys_addr
<= phys_addr
) &&
482 (phys_addr
< (md
->phys_addr
+
483 (md
->num_pages
<< EFI_PAGE_SHIFT
))))
484 return md
->attribute
;