arch/x86/platform/efi/efi_64.c

   1 /*
   2  * x86_64 specific EFI support functions
   3  * Based on Extensible Firmware Interface Specification version 1.0
   4  *
   5  * Copyright (C) 2005-2008 Intel Co.
   6  *      Fenghua Yu <fenghua.yu@intel.com>
   7  *      Bibo Mao <bibo.mao@intel.com>
   8  *      Chandramouli Narayanan <mouli@linux.intel.com>
   9  *      Huang Ying <ying.huang@intel.com>
  10  *
  11  * Code to convert EFI to E820 map has been implemented in elilo bootloader
  12  * based on a EFI patch by Edgar Hucek. Based on the E820 map, the page table
  13  * is setup appropriately for EFI runtime code.
  14  * - mouli 06/14/2007.
  15  *
  16  */
  17
  18 #define pr_fmt(fmt) "efi: " fmt
  19
  20 #include <linux/kernel.h>
  21 #include <linux/init.h>
  22 #include <linux/mm.h>
  23 #include <linux/types.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/bootmem.h>
  26 #include <linux/ioport.h>
  27 #include <linux/module.h>
  28 #include <linux/efi.h>
  29 #include <linux/uaccess.h>
  30 #include <linux/io.h>
  31 #include <linux/reboot.h>
  32 #include <linux/slab.h>
  33
  34 #include <asm/setup.h>
  35 #include <asm/page.h>
  36 #include <asm/e820.h>
  37 #include <asm/pgtable.h>
  38 #include <asm/tlbflush.h>
  39 #include <asm/proto.h>
  40 #include <asm/efi.h>
  41 #include <asm/cacheflush.h>
  42 #include <asm/fixmap.h>
  43 #include <asm/realmode.h>
  44 #include <asm/time.h>
  45 #include <asm/pgalloc.h>
  46
  47 /*
  48  * We allocate runtime services regions bottom-up, starting from -4G, i.e.
  49  * 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G.
  50  */
  51 static u64 efi_va = EFI_VA_START;
  52
  53 struct efi_scratch efi_scratch;
  54
  55 static void __init early_code_mapping_set_exec(int executable)
  56 {
  57         efi_memory_desc_t *md;
  58
  59         if (!(__supported_pte_mask & _PAGE_NX))
  60                 return;
  61
  62         /* Make EFI service code area executable */
  63         for_each_efi_memory_desc(md) {
  64                 if (md->type == EFI_RUNTIME_SERVICES_CODE ||
  65                     md->type == EFI_BOOT_SERVICES_CODE)
  66                         efi_set_executable(md, executable);
  67         }
  68 }
  69
  70 pgd_t * __init efi_call_phys_prolog(void)
  71 {
  72         unsigned long vaddress;
  73         pgd_t *save_pgd;
  74
  75         int pgd;
  76         int n_pgds;
  77
  78         if (!efi_enabled(EFI_OLD_MEMMAP)) {
  79                 save_pgd = (pgd_t *)read_cr3();
  80                 write_cr3((unsigned long)efi_scratch.efi_pgt);
  81                 goto out;
  82         }
  83
  84         early_code_mapping_set_exec(1);
  85
  86         n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE);
  87         save_pgd = kmalloc(n_pgds * sizeof(pgd_t), GFP_KERNEL);
  88
  89         for (pgd = 0; pgd < n_pgds; pgd++) {
  90                 save_pgd[pgd] = *pgd_offset_k(pgd * PGDIR_SIZE);
  91                 vaddress = (unsigned long)__va(pgd * PGDIR_SIZE);
  92                 set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), *pgd_offset_k(vaddress));
  93         }
  94 out:
  95         __flush_tlb_all();
  96
  97         return save_pgd;
  98 }
  99
 100 void __init efi_call_phys_epilog(pgd_t *save_pgd)
 101 {
 102         /*
 103          * After the lock is released, the original page table is restored.
 104          */
 105         int pgd_idx;
 106         int nr_pgds;
 107
 108         if (!efi_enabled(EFI_OLD_MEMMAP)) {
 109                 write_cr3((unsigned long)save_pgd);
 110                 __flush_tlb_all();
 111                 return;
 112         }
 113
 114         nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE);
 115
 116         for (pgd_idx = 0; pgd_idx < nr_pgds; pgd_idx++)
 117                 set_pgd(pgd_offset_k(pgd_idx * PGDIR_SIZE), save_pgd[pgd_idx]);
 118
 119         kfree(save_pgd);
 120
 121         __flush_tlb_all();
 122         early_code_mapping_set_exec(0);
 123 }
 124
 125 static pgd_t *efi_pgd;
 126
 127 /*
 128  * We need our own copy of the higher levels of the page tables
 129  * because we want to avoid inserting EFI region mappings (EFI_VA_END
 130  * to EFI_VA_START) into the standard kernel page tables. Everything
 131  * else can be shared, see efi_sync_low_kernel_mappings().
 132  */
 133 int __init efi_alloc_page_tables(void)
 134 {
 135         pgd_t *pgd;
 136         pud_t *pud;
 137         gfp_t gfp_mask;
 138
 139         if (efi_enabled(EFI_OLD_MEMMAP))
 140                 return 0;
 141
 142         gfp_mask = GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO;
 143         efi_pgd = (pgd_t *)__get_free_page(gfp_mask);
 144         if (!efi_pgd)
 145                 return -ENOMEM;
 146
 147         pgd = efi_pgd + pgd_index(EFI_VA_END);
 148
 149         pud = pud_alloc_one(NULL, 0);
 150         if (!pud) {
 151                 free_page((unsigned long)efi_pgd);
 152                 return -ENOMEM;
 153         }
 154
 155         pgd_populate(NULL, pgd, pud);
 156
 157         return 0;
 158 }
 159
 160 /*
 161  * Add low kernel mappings for passing arguments to EFI functions.
 162  */
 163 void efi_sync_low_kernel_mappings(void)
 164 {
 165         unsigned num_entries;
 166         pgd_t *pgd_k, *pgd_efi;
 167         pud_t *pud_k, *pud_efi;
 168
 169         if (efi_enabled(EFI_OLD_MEMMAP))
 170                 return;
 171
 172         /*
 173          * We can share all PGD entries apart from the one entry that
 174          * covers the EFI runtime mapping space.
 175          *
 176          * Make sure the EFI runtime region mappings are guaranteed to
 177          * only span a single PGD entry and that the entry also maps
 178          * other important kernel regions.
 179          */
 180         BUILD_BUG_ON(pgd_index(EFI_VA_END) != pgd_index(MODULES_END));
 181         BUILD_BUG_ON((EFI_VA_START & PGDIR_MASK) !=
 182                         (EFI_VA_END & PGDIR_MASK));
 183
 184         pgd_efi = efi_pgd + pgd_index(PAGE_OFFSET);
 185         pgd_k = pgd_offset_k(PAGE_OFFSET);
 186
 187         num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET);
 188         memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries);
 189
 190         /*
 191          * We share all the PUD entries apart from those that map the
 192          * EFI regions. Copy around them.
 193          */
 194         BUILD_BUG_ON((EFI_VA_START & ~PUD_MASK) != 0);
 195         BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0);
 196
 197         pgd_efi = efi_pgd + pgd_index(EFI_VA_END);
 198         pud_efi = pud_offset(pgd_efi, 0);
 199
 200         pgd_k = pgd_offset_k(EFI_VA_END);
 201         pud_k = pud_offset(pgd_k, 0);
 202
 203         num_entries = pud_index(EFI_VA_END);
 204         memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
 205
 206         pud_efi = pud_offset(pgd_efi, EFI_VA_START);
 207         pud_k = pud_offset(pgd_k, EFI_VA_START);
 208
 209         num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START);
 210         memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
 211 }
 212
 213 int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
 214 {
 215         unsigned long pfn, text;
 216         efi_memory_desc_t *md;
 217         struct page *page;
 218         unsigned npages;
 219         pgd_t *pgd;
 220
 221         if (efi_enabled(EFI_OLD_MEMMAP))
 222                 return 0;
 223
 224         efi_scratch.efi_pgt = (pgd_t *)__pa(efi_pgd);
 225         pgd = efi_pgd;
 226
 227         /*
 228          * It can happen that the physical address of new_memmap lands in memory
 229          * which is not mapped in the EFI page table. Therefore we need to go
 230          * and ident-map those pages containing the map before calling
 231          * phys_efi_set_virtual_address_map().
 232          */
 233         pfn = pa_memmap >> PAGE_SHIFT;
 234         if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, _PAGE_NX | _PAGE_RW)) {
 235                 pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap);
 236                 return 1;
 237         }
 238
 239         efi_scratch.use_pgd = true;
 240
 241         /*
 242          * When making calls to the firmware everything needs to be 1:1
 243          * mapped and addressable with 32-bit pointers. Map the kernel
 244          * text and allocate a new stack because we can't rely on the
 245          * stack pointer being < 4GB.
 246          */
 247         if (!IS_ENABLED(CONFIG_EFI_MIXED))
 248                 return 0;
 249
 250         /*
 251          * Map all of RAM so that we can access arguments in the 1:1
 252          * mapping when making EFI runtime calls.
 253          */
 254         for_each_efi_memory_desc(md) {
 255                 if (md->type != EFI_CONVENTIONAL_MEMORY &&
 256                     md->type != EFI_LOADER_DATA &&
 257                     md->type != EFI_LOADER_CODE)
 258                         continue;
 259
 260                 pfn = md->phys_addr >> PAGE_SHIFT;
 261                 npages = md->num_pages;
 262
 263                 if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, npages, _PAGE_RW)) {
 264                         pr_err("Failed to map 1:1 memory\n");
 265                         return 1;
 266                 }
 267         }
 268
 269         page = alloc_page(GFP_KERNEL|__GFP_DMA32);
 270         if (!page)
 271                 panic("Unable to allocate EFI runtime stack < 4GB\n");
 272
 273         efi_scratch.phys_stack = virt_to_phys(page_address(page));
 274         efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */
 275
 276         npages = (_etext - _text) >> PAGE_SHIFT;
 277         text = __pa(_text);
 278         pfn = text >> PAGE_SHIFT;
 279
 280         if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, _PAGE_RW)) {
 281                 pr_err("Failed to map kernel text 1:1\n");
 282                 return 1;
 283         }
 284
 285         return 0;
 286 }
 287
 288 static void __init __map_region(efi_memory_desc_t *md, u64 va)
 289 {
 290         unsigned long flags = _PAGE_RW;
 291         unsigned long pfn;
 292         pgd_t *pgd = efi_pgd;
 293
 294         if (!(md->attribute & EFI_MEMORY_WB))
 295                 flags |= _PAGE_PCD;
 296
 297         pfn = md->phys_addr >> PAGE_SHIFT;
 298         if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags))
 299                 pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
 300                            md->phys_addr, va);
 301 }
 302
 303 void __init efi_map_region(efi_memory_desc_t *md)
 304 {
 305         unsigned long size = md->num_pages << PAGE_SHIFT;
 306         u64 pa = md->phys_addr;
 307
 308         if (efi_enabled(EFI_OLD_MEMMAP))
 309                 return old_map_region(md);
 310
 311         /*
 312          * Make sure the 1:1 mappings are present as a catch-all for b0rked
 313          * firmware which doesn't update all internal pointers after switching
 314          * to virtual mode and would otherwise crap on us.
 315          */
 316         __map_region(md, md->phys_addr);
 317
 318         /*
 319          * Enforce the 1:1 mapping as the default virtual address when
 320          * booting in EFI mixed mode, because even though we may be
 321          * running a 64-bit kernel, the firmware may only be 32-bit.
 322          */
 323         if (!efi_is_native () && IS_ENABLED(CONFIG_EFI_MIXED)) {
 324                 md->virt_addr = md->phys_addr;
 325                 return;
 326         }
 327
 328         efi_va -= size;
 329
 330         /* Is PA 2M-aligned? */
 331         if (!(pa & (PMD_SIZE - 1))) {
 332                 efi_va &= PMD_MASK;
 333         } else {
 334                 u64 pa_offset = pa & (PMD_SIZE - 1);
 335                 u64 prev_va = efi_va;
 336
 337                 /* get us the same offset within this 2M page */
 338                 efi_va = (efi_va & PMD_MASK) + pa_offset;
 339
 340                 if (efi_va > prev_va)
 341                         efi_va -= PMD_SIZE;
 342         }
 343
 344         if (efi_va < EFI_VA_END) {
 345                 pr_warn(FW_WARN "VA address range overflow!\n");
 346                 return;
 347         }
 348
 349         /* Do the VA map */
 350         __map_region(md, efi_va);
 351         md->virt_addr = efi_va;
 352 }
 353
 354 /*
 355  * kexec kernel will use efi_map_region_fixed to map efi runtime memory ranges.
 356  * md->virt_addr is the original virtual address which had been mapped in kexec
 357  * 1st kernel.
 358  */
 359 void __init efi_map_region_fixed(efi_memory_desc_t *md)
 360 {
 361         __map_region(md, md->virt_addr);
 362 }
 363
 364 void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
 365                                  u32 type, u64 attribute)
 366 {
 367         unsigned long last_map_pfn;
 368
 369         if (type == EFI_MEMORY_MAPPED_IO)
 370                 return ioremap(phys_addr, size);
 371
 372         last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
 373         if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
 374                 unsigned long top = last_map_pfn << PAGE_SHIFT;
 375                 efi_ioremap(top, size - (top - phys_addr), type, attribute);
 376         }
 377
 378         if (!(attribute & EFI_MEMORY_WB))
 379                 efi_memory_uc((u64)(unsigned long)__va(phys_addr), size);
 380
 381         return (void __iomem *)__va(phys_addr);
 382 }
 383
 384 void __init parse_efi_setup(u64 phys_addr, u32 data_len)
 385 {
 386         efi_setup = phys_addr + sizeof(struct setup_data);
 387 }
 388
 389 void __init efi_runtime_update_mappings(void)
 390 {
 391         unsigned long pfn;
 392         pgd_t *pgd = efi_pgd;
 393         efi_memory_desc_t *md;
 394
 395         if (efi_enabled(EFI_OLD_MEMMAP)) {
 396                 if (__supported_pte_mask & _PAGE_NX)
 397                         runtime_code_page_mkexec();
 398                 return;
 399         }
 400
 401         if (!efi_enabled(EFI_NX_PE_DATA))
 402                 return;
 403
 404         for_each_efi_memory_desc(md) {
 405                 unsigned long pf = 0;
 406
 407                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 408                         continue;
 409
 410                 if (!(md->attribute & EFI_MEMORY_WB))
 411                         pf |= _PAGE_PCD;
 412
 413                 if ((md->attribute & EFI_MEMORY_XP) ||
 414                         (md->type == EFI_RUNTIME_SERVICES_DATA))
 415                         pf |= _PAGE_NX;
 416
 417                 if (!(md->attribute & EFI_MEMORY_RO) &&
 418                         (md->type != EFI_RUNTIME_SERVICES_CODE))
 419                         pf |= _PAGE_RW;
 420
 421                 /* Update the 1:1 mapping */
 422                 pfn = md->phys_addr >> PAGE_SHIFT;
 423                 if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, md->num_pages, pf))
 424                         pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
 425                                    md->phys_addr, md->virt_addr);
 426
 427                 if (kernel_map_pages_in_pgd(pgd, pfn, md->virt_addr, md->num_pages, pf))
 428                         pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
 429                                    md->phys_addr, md->virt_addr);
 430         }
 431 }
 432
 433 void __init efi_dump_pagetable(void)
 434 {
 435 #ifdef CONFIG_EFI_PGT_DUMP
 436         ptdump_walk_pgd_level(NULL, efi_pgd);
 437 #endif
 438 }
 439
 440 #ifdef CONFIG_EFI_MIXED
 441 extern efi_status_t efi64_thunk(u32, ...);
 442
 443 #define runtime_service32(func)                                          \
 444 ({                                                                       \
 445         u32 table = (u32)(unsigned long)efi.systab;                      \
 446         u32 *rt, *___f;                                                  \
 447                                                                          \
 448         rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime));  \
 449         ___f = (u32 *)(*rt + offsetof(efi_runtime_services_32_t, func)); \
 450         *___f;                                                           \
 451 })
 452
 453 /*
 454  * Switch to the EFI page tables early so that we can access the 1:1
 455  * runtime services mappings which are not mapped in any other page
 456  * tables. This function must be called before runtime_service32().
 457  *
 458  * Also, disable interrupts because the IDT points to 64-bit handlers,
 459  * which aren't going to function correctly when we switch to 32-bit.
 460  */
 461 #define efi_thunk(f, ...)                                               \
 462 ({                                                                      \
 463         efi_status_t __s;                                               \
 464         unsigned long __flags;                                          \
 465         u32 __func;                                                     \
 466                                                                         \
 467         local_irq_save(__flags);                                        \
 468         arch_efi_call_virt_setup();                                     \
 469                                                                         \
 470         __func = runtime_service32(f);                                  \
 471         __s = efi64_thunk(__func, __VA_ARGS__);                         \
 472                                                                         \
 473         arch_efi_call_virt_teardown();                                  \
 474         local_irq_restore(__flags);                                     \
 475                                                                         \
 476         __s;                                                            \
 477 })
 478
 479 efi_status_t efi_thunk_set_virtual_address_map(
 480         void *phys_set_virtual_address_map,
 481         unsigned long memory_map_size,
 482         unsigned long descriptor_size,
 483         u32 descriptor_version,
 484         efi_memory_desc_t *virtual_map)
 485 {
 486         efi_status_t status;
 487         unsigned long flags;
 488         u32 func;
 489
 490         efi_sync_low_kernel_mappings();
 491         local_irq_save(flags);
 492
 493         efi_scratch.prev_cr3 = read_cr3();
 494         write_cr3((unsigned long)efi_scratch.efi_pgt);
 495         __flush_tlb_all();
 496
 497         func = (u32)(unsigned long)phys_set_virtual_address_map;
 498         status = efi64_thunk(func, memory_map_size, descriptor_size,
 499                              descriptor_version, virtual_map);
 500
 501         write_cr3(efi_scratch.prev_cr3);
 502         __flush_tlb_all();
 503         local_irq_restore(flags);
 504
 505         return status;
 506 }
 507
 508 static efi_status_t efi_thunk_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 509 {
 510         efi_status_t status;
 511         u32 phys_tm, phys_tc;
 512
 513         spin_lock(&rtc_lock);
 514
 515         phys_tm = virt_to_phys(tm);
 516         phys_tc = virt_to_phys(tc);
 517
 518         status = efi_thunk(get_time, phys_tm, phys_tc);
 519
 520         spin_unlock(&rtc_lock);
 521
 522         return status;
 523 }
 524
 525 static efi_status_t efi_thunk_set_time(efi_time_t *tm)
 526 {
 527         efi_status_t status;
 528         u32 phys_tm;
 529
 530         spin_lock(&rtc_lock);
 531
 532         phys_tm = virt_to_phys(tm);
 533
 534         status = efi_thunk(set_time, phys_tm);
 535
 536         spin_unlock(&rtc_lock);
 537
 538         return status;
 539 }
 540
 541 static efi_status_t
 542 efi_thunk_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending,
 543                           efi_time_t *tm)
 544 {
 545         efi_status_t status;
 546         u32 phys_enabled, phys_pending, phys_tm;
 547
 548         spin_lock(&rtc_lock);
 549
 550         phys_enabled = virt_to_phys(enabled);
 551         phys_pending = virt_to_phys(pending);
 552         phys_tm = virt_to_phys(tm);
 553
 554         status = efi_thunk(get_wakeup_time, phys_enabled,
 555                              phys_pending, phys_tm);
 556
 557         spin_unlock(&rtc_lock);
 558
 559         return status;
 560 }
 561
 562 static efi_status_t
 563 efi_thunk_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 564 {
 565         efi_status_t status;
 566         u32 phys_tm;
 567
 568         spin_lock(&rtc_lock);
 569
 570         phys_tm = virt_to_phys(tm);
 571
 572         status = efi_thunk(set_wakeup_time, enabled, phys_tm);
 573
 574         spin_unlock(&rtc_lock);
 575
 576         return status;
 577 }
 578
 579
 580 static efi_status_t
 581 efi_thunk_get_variable(efi_char16_t *name, efi_guid_t *vendor,
 582                        u32 *attr, unsigned long *data_size, void *data)
 583 {
 584         efi_status_t status;
 585         u32 phys_name, phys_vendor, phys_attr;
 586         u32 phys_data_size, phys_data;
 587
 588         phys_data_size = virt_to_phys(data_size);
 589         phys_vendor = virt_to_phys(vendor);
 590         phys_name = virt_to_phys(name);
 591         phys_attr = virt_to_phys(attr);
 592         phys_data = virt_to_phys(data);
 593
 594         status = efi_thunk(get_variable, phys_name, phys_vendor,
 595                            phys_attr, phys_data_size, phys_data);
 596
 597         return status;
 598 }
 599
 600 static efi_status_t
 601 efi_thunk_set_variable(efi_char16_t *name, efi_guid_t *vendor,
 602                        u32 attr, unsigned long data_size, void *data)
 603 {
 604         u32 phys_name, phys_vendor, phys_data;
 605         efi_status_t status;
 606
 607         phys_name = virt_to_phys(name);
 608         phys_vendor = virt_to_phys(vendor);
 609         phys_data = virt_to_phys(data);
 610
 611         /* If data_size is > sizeof(u32) we've got problems */
 612         status = efi_thunk(set_variable, phys_name, phys_vendor,
 613                            attr, data_size, phys_data);
 614
 615         return status;
 616 }
 617
 618 static efi_status_t
 619 efi_thunk_get_next_variable(unsigned long *name_size,
 620                             efi_char16_t *name,
 621                             efi_guid_t *vendor)
 622 {
 623         efi_status_t status;
 624         u32 phys_name_size, phys_name, phys_vendor;
 625
 626         phys_name_size = virt_to_phys(name_size);
 627         phys_vendor = virt_to_phys(vendor);
 628         phys_name = virt_to_phys(name);
 629
 630         status = efi_thunk(get_next_variable, phys_name_size,
 631                            phys_name, phys_vendor);
 632
 633         return status;
 634 }
 635
 636 static efi_status_t
 637 efi_thunk_get_next_high_mono_count(u32 *count)
 638 {
 639         efi_status_t status;
 640         u32 phys_count;
 641
 642         phys_count = virt_to_phys(count);
 643         status = efi_thunk(get_next_high_mono_count, phys_count);
 644
 645         return status;
 646 }
 647
 648 static void
 649 efi_thunk_reset_system(int reset_type, efi_status_t status,
 650                        unsigned long data_size, efi_char16_t *data)
 651 {
 652         u32 phys_data;
 653
 654         phys_data = virt_to_phys(data);
 655
 656         efi_thunk(reset_system, reset_type, status, data_size, phys_data);
 657 }
 658
 659 static efi_status_t
 660 efi_thunk_update_capsule(efi_capsule_header_t **capsules,
 661                          unsigned long count, unsigned long sg_list)
 662 {
 663         /*
 664          * To properly support this function we would need to repackage
 665          * 'capsules' because the firmware doesn't understand 64-bit
 666          * pointers.
 667          */
 668         return EFI_UNSUPPORTED;
 669 }
 670
 671 static efi_status_t
 672 efi_thunk_query_variable_info(u32 attr, u64 *storage_space,
 673                               u64 *remaining_space,
 674                               u64 *max_variable_size)
 675 {
 676         efi_status_t status;
 677         u32 phys_storage, phys_remaining, phys_max;
 678
 679         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 680                 return EFI_UNSUPPORTED;
 681
 682         phys_storage = virt_to_phys(storage_space);
 683         phys_remaining = virt_to_phys(remaining_space);
 684         phys_max = virt_to_phys(max_variable_size);
 685
 686         status = efi_thunk(query_variable_info, attr, phys_storage,
 687                            phys_remaining, phys_max);
 688
 689         return status;
 690 }
 691
 692 static efi_status_t
 693 efi_thunk_query_capsule_caps(efi_capsule_header_t **capsules,
 694                              unsigned long count, u64 *max_size,
 695                              int *reset_type)
 696 {
 697         /*
 698          * To properly support this function we would need to repackage
 699          * 'capsules' because the firmware doesn't understand 64-bit
 700          * pointers.
 701          */
 702         return EFI_UNSUPPORTED;
 703 }
 704
 705 void efi_thunk_runtime_setup(void)
 706 {
 707         efi.get_time = efi_thunk_get_time;
 708         efi.set_time = efi_thunk_set_time;
 709         efi.get_wakeup_time = efi_thunk_get_wakeup_time;
 710         efi.set_wakeup_time = efi_thunk_set_wakeup_time;
 711         efi.get_variable = efi_thunk_get_variable;
 712         efi.get_next_variable = efi_thunk_get_next_variable;
 713         efi.set_variable = efi_thunk_set_variable;
 714         efi.get_next_high_mono_count = efi_thunk_get_next_high_mono_count;
 715         efi.reset_system = efi_thunk_reset_system;
 716         efi.query_variable_info = efi_thunk_query_variable_info;
 717         efi.update_capsule = efi_thunk_update_capsule;
 718         efi.query_capsule_caps = efi_thunk_query_capsule_caps;
 719 }
 720 #endif /* CONFIG_EFI_MIXED */