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;
504 u64 end, systab, addr, npages, end_pfn;
508 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
510 if (!(md->attribute & EFI_MEMORY_RUNTIME))
513 size = md->num_pages << EFI_PAGE_SHIFT;
514 end = md->phys_addr + size;
516 end_pfn = PFN_UP(end);
517 if (end_pfn <= max_low_pfn_mapped
518 || (end_pfn > (1UL << (32 - PAGE_SHIFT))
519 && end_pfn <= max_pfn_mapped))
520 va = __va(md->phys_addr);
522 va = efi_ioremap(md->phys_addr, size, md->type);
524 md->virt_addr = (u64) (unsigned long) va;
527 printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
528 (unsigned long long)md->phys_addr);
532 if (!(md->attribute & EFI_MEMORY_WB)) {
533 addr = md->virt_addr;
534 npages = md->num_pages;
535 memrange_efi_to_native(&addr, &npages);
536 set_memory_uc(addr, npages);
539 systab = (u64) (unsigned long) efi_phys.systab;
540 if (md->phys_addr <= systab && systab < end) {
541 systab += md->virt_addr - md->phys_addr;
542 efi.systab = (efi_system_table_t *) (unsigned long) systab;
548 status = phys_efi_set_virtual_address_map(
549 memmap.desc_size * memmap.nr_map,
554 if (status != EFI_SUCCESS) {
555 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
556 "(status=%lx)!\n", status);
557 panic("EFI call to SetVirtualAddressMap() failed!");
561 * Now that EFI is in virtual mode, update the function
562 * pointers in the runtime service table to the new virtual addresses.
564 * Call EFI services through wrapper functions.
566 efi.get_time = virt_efi_get_time;
567 efi.set_time = virt_efi_set_time;
568 efi.get_wakeup_time = virt_efi_get_wakeup_time;
569 efi.set_wakeup_time = virt_efi_set_wakeup_time;
570 efi.get_variable = virt_efi_get_variable;
571 efi.get_next_variable = virt_efi_get_next_variable;
572 efi.set_variable = virt_efi_set_variable;
573 efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
574 efi.reset_system = virt_efi_reset_system;
575 efi.set_virtual_address_map = NULL;
576 if (__supported_pte_mask & _PAGE_NX)
577 runtime_code_page_mkexec();
578 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
583 * Convenience functions to obtain memory types and attributes
585 u32 efi_mem_type(unsigned long phys_addr)
587 efi_memory_desc_t *md;
590 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
592 if ((md->phys_addr <= phys_addr) &&
593 (phys_addr < (md->phys_addr +
594 (md->num_pages << EFI_PAGE_SHIFT))))
600 u64 efi_mem_attributes(unsigned long phys_addr)
602 efi_memory_desc_t *md;
605 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
607 if ((md->phys_addr <= phys_addr) &&
608 (phys_addr < (md->phys_addr +
609 (md->num_pages << EFI_PAGE_SHIFT))))
610 return md->attribute;