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>
43 #include <asm/cacheflush.h>
44 #include <asm/tlbflush.h>
45 #include <asm/x86_init.h>
51 EXPORT_SYMBOL(efi_enabled);
56 struct efi_memory_map memmap;
58 static struct efi efi_phys __initdata;
59 static efi_system_table_t efi_systab __initdata;
61 static int __init setup_noefi(char *arg)
66 early_param("noefi", setup_noefi);
69 EXPORT_SYMBOL(add_efi_memmap);
71 static int __init setup_add_efi_memmap(char *arg)
76 early_param("add_efi_memmap", setup_add_efi_memmap);
79 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
81 return efi_call_virt2(get_time, tm, tc);
84 static efi_status_t virt_efi_set_time(efi_time_t *tm)
86 return efi_call_virt1(set_time, tm);
89 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
93 return efi_call_virt3(get_wakeup_time,
94 enabled, pending, tm);
97 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
99 return efi_call_virt2(set_wakeup_time,
103 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
106 unsigned long *data_size,
109 return efi_call_virt5(get_variable,
114 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
118 return efi_call_virt3(get_next_variable,
119 name_size, name, vendor);
122 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
125 unsigned long data_size,
128 return efi_call_virt5(set_variable,
133 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
135 return efi_call_virt1(get_next_high_mono_count, count);
138 static void virt_efi_reset_system(int reset_type,
140 unsigned long data_size,
143 efi_call_virt4(reset_system, reset_type, status,
147 static efi_status_t virt_efi_set_virtual_address_map(
148 unsigned long memory_map_size,
149 unsigned long descriptor_size,
150 u32 descriptor_version,
151 efi_memory_desc_t *virtual_map)
153 return efi_call_virt4(set_virtual_address_map,
154 memory_map_size, descriptor_size,
155 descriptor_version, virtual_map);
158 static efi_status_t __init phys_efi_set_virtual_address_map(
159 unsigned long memory_map_size,
160 unsigned long descriptor_size,
161 u32 descriptor_version,
162 efi_memory_desc_t *virtual_map)
166 efi_call_phys_prelog();
167 status = efi_call_phys4(efi_phys.set_virtual_address_map,
168 memory_map_size, descriptor_size,
169 descriptor_version, virtual_map);
170 efi_call_phys_epilog();
174 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
179 efi_call_phys_prelog();
180 status = efi_call_phys2(efi_phys.get_time, tm, tc);
181 efi_call_phys_epilog();
185 int efi_set_rtc_mmss(unsigned long nowtime)
187 int real_seconds, real_minutes;
192 status = efi.get_time(&eft, &cap);
193 if (status != EFI_SUCCESS) {
194 printk(KERN_ERR "Oops: efitime: can't read time!\n");
198 real_seconds = nowtime % 60;
199 real_minutes = nowtime / 60;
200 if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
203 eft.minute = real_minutes;
204 eft.second = real_seconds;
206 status = efi.set_time(&eft);
207 if (status != EFI_SUCCESS) {
208 printk(KERN_ERR "Oops: efitime: can't write time!\n");
214 unsigned long efi_get_time(void)
220 status = efi.get_time(&eft, &cap);
221 if (status != EFI_SUCCESS)
222 printk(KERN_ERR "Oops: efitime: can't read time!\n");
224 return mktime(eft.year, eft.month, eft.day, eft.hour,
225 eft.minute, eft.second);
229 * Tell the kernel about the EFI memory map. This might include
230 * more than the max 128 entries that can fit in the e820 legacy
231 * (zeropage) memory map.
234 static void __init do_add_efi_memmap(void)
238 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
239 efi_memory_desc_t *md = p;
240 unsigned long long start = md->phys_addr;
241 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
245 case EFI_LOADER_CODE:
246 case EFI_LOADER_DATA:
247 case EFI_BOOT_SERVICES_CODE:
248 case EFI_BOOT_SERVICES_DATA:
249 case EFI_CONVENTIONAL_MEMORY:
250 if (md->attribute & EFI_MEMORY_WB)
251 e820_type = E820_RAM;
253 e820_type = E820_RESERVED;
255 case EFI_ACPI_RECLAIM_MEMORY:
256 e820_type = E820_ACPI;
258 case EFI_ACPI_MEMORY_NVS:
259 e820_type = E820_NVS;
261 case EFI_UNUSABLE_MEMORY:
262 e820_type = E820_UNUSABLE;
266 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
267 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
268 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
270 e820_type = E820_RESERVED;
273 e820_add_region(start, size, e820_type);
275 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
278 void __init efi_reserve_early(void)
283 pmap = boot_params.efi_info.efi_memmap;
285 pmap = (boot_params.efi_info.efi_memmap |
286 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
288 memmap.phys_map = (void *)pmap;
289 memmap.nr_map = boot_params.efi_info.efi_memmap_size /
290 boot_params.efi_info.efi_memdesc_size;
291 memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
292 memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
293 reserve_early(pmap, pmap + memmap.nr_map * memmap.desc_size,
298 static void __init print_efi_memmap(void)
300 efi_memory_desc_t *md;
304 for (p = memmap.map, i = 0;
306 p += memmap.desc_size, i++) {
308 printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
309 "range=[0x%016llx-0x%016llx) (%lluMB)\n",
310 i, md->type, md->attribute, md->phys_addr,
311 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
312 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
315 #endif /* EFI_DEBUG */
317 void __init efi_init(void)
319 efi_config_table_t *config_tables;
320 efi_runtime_services_t *runtime;
322 char vendor[100] = "unknown";
327 efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
329 efi_phys.systab = (efi_system_table_t *)
330 (boot_params.efi_info.efi_systab |
331 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
334 efi.systab = early_ioremap((unsigned long)efi_phys.systab,
335 sizeof(efi_system_table_t));
336 if (efi.systab == NULL)
337 printk(KERN_ERR "Couldn't map the EFI system table!\n");
338 memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
339 early_iounmap(efi.systab, sizeof(efi_system_table_t));
340 efi.systab = &efi_systab;
343 * Verify the EFI Table
345 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
346 printk(KERN_ERR "EFI system table signature incorrect!\n");
347 if ((efi.systab->hdr.revision >> 16) == 0)
348 printk(KERN_ERR "Warning: EFI system table version "
349 "%d.%02d, expected 1.00 or greater!\n",
350 efi.systab->hdr.revision >> 16,
351 efi.systab->hdr.revision & 0xffff);
354 * Show what we know for posterity
356 c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
358 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
362 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
363 early_iounmap(tmp, 2);
365 printk(KERN_INFO "EFI v%u.%.02u by %s \n",
366 efi.systab->hdr.revision >> 16,
367 efi.systab->hdr.revision & 0xffff, vendor);
370 * Let's see what config tables the firmware passed to us.
372 config_tables = early_ioremap(
374 efi.systab->nr_tables * sizeof(efi_config_table_t));
375 if (config_tables == NULL)
376 printk(KERN_ERR "Could not map EFI Configuration Table!\n");
379 for (i = 0; i < efi.systab->nr_tables; i++) {
380 if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
381 efi.mps = config_tables[i].table;
382 printk(" MPS=0x%lx ", config_tables[i].table);
383 } else if (!efi_guidcmp(config_tables[i].guid,
384 ACPI_20_TABLE_GUID)) {
385 efi.acpi20 = config_tables[i].table;
386 printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
387 } else if (!efi_guidcmp(config_tables[i].guid,
389 efi.acpi = config_tables[i].table;
390 printk(" ACPI=0x%lx ", config_tables[i].table);
391 } else if (!efi_guidcmp(config_tables[i].guid,
392 SMBIOS_TABLE_GUID)) {
393 efi.smbios = config_tables[i].table;
394 printk(" SMBIOS=0x%lx ", config_tables[i].table);
396 } else if (!efi_guidcmp(config_tables[i].guid,
397 UV_SYSTEM_TABLE_GUID)) {
398 efi.uv_systab = config_tables[i].table;
399 printk(" UVsystab=0x%lx ", config_tables[i].table);
401 } else if (!efi_guidcmp(config_tables[i].guid,
403 efi.hcdp = config_tables[i].table;
404 printk(" HCDP=0x%lx ", config_tables[i].table);
405 } else if (!efi_guidcmp(config_tables[i].guid,
406 UGA_IO_PROTOCOL_GUID)) {
407 efi.uga = config_tables[i].table;
408 printk(" UGA=0x%lx ", config_tables[i].table);
412 early_iounmap(config_tables,
413 efi.systab->nr_tables * sizeof(efi_config_table_t));
416 * Check out the runtime services table. We need to map
417 * the runtime services table so that we can grab the physical
418 * address of several of the EFI runtime functions, needed to
419 * set the firmware into virtual mode.
421 runtime = early_ioremap((unsigned long)efi.systab->runtime,
422 sizeof(efi_runtime_services_t));
423 if (runtime != NULL) {
425 * We will only need *early* access to the following
426 * two EFI runtime services before set_virtual_address_map
429 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
430 efi_phys.set_virtual_address_map =
431 (efi_set_virtual_address_map_t *)
432 runtime->set_virtual_address_map;
434 * Make efi_get_time can be called before entering
437 efi.get_time = phys_efi_get_time;
439 printk(KERN_ERR "Could not map the EFI runtime service "
441 early_iounmap(runtime, sizeof(efi_runtime_services_t));
443 /* Map the EFI memory map */
444 memmap.map = early_ioremap((unsigned long)memmap.phys_map,
445 memmap.nr_map * memmap.desc_size);
446 if (memmap.map == NULL)
447 printk(KERN_ERR "Could not map the EFI memory map!\n");
448 memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
450 if (memmap.desc_size != sizeof(efi_memory_desc_t))
452 "Kernel-defined memdesc doesn't match the one from EFI!\n");
457 x86_platform.get_wallclock = efi_get_time;
458 x86_platform.set_wallclock = efi_set_rtc_mmss;
460 /* Setup for EFI runtime service */
461 reboot_type = BOOT_EFI;
468 static void __init runtime_code_page_mkexec(void)
470 efi_memory_desc_t *md;
474 /* Make EFI runtime service code area executable */
475 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
478 if (md->type != EFI_RUNTIME_SERVICES_CODE)
481 addr = md->virt_addr;
482 npages = md->num_pages;
483 memrange_efi_to_native(&addr, &npages);
484 set_memory_x(addr, npages);
489 * This function will switch the EFI runtime services to virtual mode.
490 * Essentially, look through the EFI memmap and map every region that
491 * has the runtime attribute bit set in its memory descriptor and update
492 * that memory descriptor with the virtual address obtained from ioremap().
493 * This enables the runtime services to be called without having to
494 * thunk back into physical mode for every invocation.
496 void __init efi_enter_virtual_mode(void)
498 efi_memory_desc_t *md;
501 u64 end, systab, addr, npages, end_pfn;
505 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
507 if (!(md->attribute & EFI_MEMORY_RUNTIME))
510 size = md->num_pages << EFI_PAGE_SHIFT;
511 end = md->phys_addr + size;
513 end_pfn = PFN_UP(end);
514 if (end_pfn <= max_low_pfn_mapped
515 || (end_pfn > (1UL << (32 - PAGE_SHIFT))
516 && end_pfn <= max_pfn_mapped))
517 va = __va(md->phys_addr);
519 va = efi_ioremap(md->phys_addr, size, md->type);
521 md->virt_addr = (u64) (unsigned long) va;
524 printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
525 (unsigned long long)md->phys_addr);
529 if (!(md->attribute & EFI_MEMORY_WB)) {
530 addr = md->virt_addr;
531 npages = md->num_pages;
532 memrange_efi_to_native(&addr, &npages);
533 set_memory_uc(addr, npages);
536 systab = (u64) (unsigned long) efi_phys.systab;
537 if (md->phys_addr <= systab && systab < end) {
538 systab += md->virt_addr - md->phys_addr;
539 efi.systab = (efi_system_table_t *) (unsigned long) systab;
545 status = phys_efi_set_virtual_address_map(
546 memmap.desc_size * memmap.nr_map,
551 if (status != EFI_SUCCESS) {
552 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
553 "(status=%lx)!\n", status);
554 panic("EFI call to SetVirtualAddressMap() failed!");
558 * Now that EFI is in virtual mode, update the function
559 * pointers in the runtime service table to the new virtual addresses.
561 * Call EFI services through wrapper functions.
563 efi.get_time = virt_efi_get_time;
564 efi.set_time = virt_efi_set_time;
565 efi.get_wakeup_time = virt_efi_get_wakeup_time;
566 efi.set_wakeup_time = virt_efi_set_wakeup_time;
567 efi.get_variable = virt_efi_get_variable;
568 efi.get_next_variable = virt_efi_get_next_variable;
569 efi.set_variable = virt_efi_set_variable;
570 efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
571 efi.reset_system = virt_efi_reset_system;
572 efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
573 if (__supported_pte_mask & _PAGE_NX)
574 runtime_code_page_mkexec();
575 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
580 * Convenience functions to obtain memory types and attributes
582 u32 efi_mem_type(unsigned long phys_addr)
584 efi_memory_desc_t *md;
587 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
589 if ((md->phys_addr <= phys_addr) &&
590 (phys_addr < (md->phys_addr +
591 (md->num_pages << EFI_PAGE_SHIFT))))
597 u64 efi_mem_attributes(unsigned long phys_addr)
599 efi_memory_desc_t *md;
602 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
604 if ((md->phys_addr <= phys_addr) &&
605 (phys_addr < (md->phys_addr +
606 (md->num_pages << EFI_PAGE_SHIFT))))
607 return md->attribute;