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_REPEAT | __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 void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages)
 289 {
 290         kernel_unmap_pages_in_pgd(efi_pgd, pa_memmap, num_pages);
 291 }
 292
 293 static void __init __map_region(efi_memory_desc_t *md, u64 va)
 294 {
 295         unsigned long flags = _PAGE_RW;
 296         unsigned long pfn;
 297         pgd_t *pgd = efi_pgd;
 298
 299         if (!(md->attribute & EFI_MEMORY_WB))
 300                 flags |= _PAGE_PCD;
 301
 302         pfn = md->phys_addr >> PAGE_SHIFT;
 303         if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags))
 304                 pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
 305                            md->phys_addr, va);
 306 }
 307
 308 void __init efi_map_region(efi_memory_desc_t *md)
 309 {
 310         unsigned long size = md->num_pages << PAGE_SHIFT;
 311         u64 pa = md->phys_addr;
 312
 313         if (efi_enabled(EFI_OLD_MEMMAP))
 314                 return old_map_region(md);
 315
 316         /*
 317          * Make sure the 1:1 mappings are present as a catch-all for b0rked
 318          * firmware which doesn't update all internal pointers after switching
 319          * to virtual mode and would otherwise crap on us.
 320          */
 321         __map_region(md, md->phys_addr);
 322
 323         /*
 324          * Enforce the 1:1 mapping as the default virtual address when
 325          * booting in EFI mixed mode, because even though we may be
 326          * running a 64-bit kernel, the firmware may only be 32-bit.
 327          */
 328         if (!efi_is_native () && IS_ENABLED(CONFIG_EFI_MIXED)) {
 329                 md->virt_addr = md->phys_addr;
 330                 return;
 331         }
 332
 333         efi_va -= size;
 334
 335         /* Is PA 2M-aligned? */
 336         if (!(pa & (PMD_SIZE - 1))) {
 337                 efi_va &= PMD_MASK;
 338         } else {
 339                 u64 pa_offset = pa & (PMD_SIZE - 1);
 340                 u64 prev_va = efi_va;
 341
 342                 /* get us the same offset within this 2M page */
 343                 efi_va = (efi_va & PMD_MASK) + pa_offset;
 344
 345                 if (efi_va > prev_va)
 346                         efi_va -= PMD_SIZE;
 347         }
 348
 349         if (efi_va < EFI_VA_END) {
 350                 pr_warn(FW_WARN "VA address range overflow!\n");
 351                 return;
 352         }
 353
 354         /* Do the VA map */
 355         __map_region(md, efi_va);
 356         md->virt_addr = efi_va;
 357 }
 358
 359 /*
 360  * kexec kernel will use efi_map_region_fixed to map efi runtime memory ranges.
 361  * md->virt_addr is the original virtual address which had been mapped in kexec
 362  * 1st kernel.
 363  */
 364 void __init efi_map_region_fixed(efi_memory_desc_t *md)
 365 {
 366         __map_region(md, md->virt_addr);
 367 }
 368
 369 void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
 370                                  u32 type, u64 attribute)
 371 {
 372         unsigned long last_map_pfn;
 373
 374         if (type == EFI_MEMORY_MAPPED_IO)
 375                 return ioremap(phys_addr, size);
 376
 377         last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
 378         if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
 379                 unsigned long top = last_map_pfn << PAGE_SHIFT;
 380                 efi_ioremap(top, size - (top - phys_addr), type, attribute);
 381         }
 382
 383         if (!(attribute & EFI_MEMORY_WB))
 384                 efi_memory_uc((u64)(unsigned long)__va(phys_addr), size);
 385
 386         return (void __iomem *)__va(phys_addr);
 387 }
 388
 389 void __init parse_efi_setup(u64 phys_addr, u32 data_len)
 390 {
 391         efi_setup = phys_addr + sizeof(struct setup_data);
 392 }
 393
 394 void __init efi_runtime_update_mappings(void)
 395 {
 396         unsigned long pfn;
 397         pgd_t *pgd = efi_pgd;
 398         efi_memory_desc_t *md;
 399
 400         if (efi_enabled(EFI_OLD_MEMMAP)) {
 401                 if (__supported_pte_mask & _PAGE_NX)
 402                         runtime_code_page_mkexec();
 403                 return;
 404         }
 405
 406         if (!efi_enabled(EFI_NX_PE_DATA))
 407                 return;
 408
 409         for_each_efi_memory_desc(md) {
 410                 unsigned long pf = 0;
 411
 412                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 413                         continue;
 414
 415                 if (!(md->attribute & EFI_MEMORY_WB))
 416                         pf |= _PAGE_PCD;
 417
 418                 if ((md->attribute & EFI_MEMORY_XP) ||
 419                         (md->type == EFI_RUNTIME_SERVICES_DATA))
 420                         pf |= _PAGE_NX;
 421
 422                 if (!(md->attribute & EFI_MEMORY_RO) &&
 423                         (md->type != EFI_RUNTIME_SERVICES_CODE))
 424                         pf |= _PAGE_RW;
 425
 426                 /* Update the 1:1 mapping */
 427                 pfn = md->phys_addr >> PAGE_SHIFT;
 428                 if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, md->num_pages, pf))
 429                         pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
 430                                    md->phys_addr, md->virt_addr);
 431
 432                 if (kernel_map_pages_in_pgd(pgd, pfn, md->virt_addr, md->num_pages, pf))
 433                         pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
 434                                    md->phys_addr, md->virt_addr);
 435         }
 436 }
 437
 438 void __init efi_dump_pagetable(void)
 439 {
 440 #ifdef CONFIG_EFI_PGT_DUMP
 441         ptdump_walk_pgd_level(NULL, efi_pgd);
 442 #endif
 443 }
 444
 445 #ifdef CONFIG_EFI_MIXED
 446 extern efi_status_t efi64_thunk(u32, ...);
 447
 448 #define runtime_service32(func)                                          \
 449 ({                                                                       \
 450         u32 table = (u32)(unsigned long)efi.systab;                      \
 451         u32 *rt, *___f;                                                  \
 452                                                                          \
 453         rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime));  \
 454         ___f = (u32 *)(*rt + offsetof(efi_runtime_services_32_t, func)); \
 455         *___f;                                                           \
 456 })
 457
 458 /*
 459  * Switch to the EFI page tables early so that we can access the 1:1
 460  * runtime services mappings which are not mapped in any other page
 461  * tables. This function must be called before runtime_service32().
 462  *
 463  * Also, disable interrupts because the IDT points to 64-bit handlers,
 464  * which aren't going to function correctly when we switch to 32-bit.
 465  */
 466 #define efi_thunk(f, ...)                                               \
 467 ({                                                                      \
 468         efi_status_t __s;                                               \
 469         unsigned long flags;                                            \
 470         u32 func;                                                       \
 471                                                                         \
 472         efi_sync_low_kernel_mappings();                                 \
 473         local_irq_save(flags);                                          \
 474                                                                         \
 475         efi_scratch.prev_cr3 = read_cr3();                              \
 476         write_cr3((unsigned long)efi_scratch.efi_pgt);                  \
 477         __flush_tlb_all();                                              \
 478                                                                         \
 479         func = runtime_service32(f);                                    \
 480         __s = efi64_thunk(func, __VA_ARGS__);                   \
 481                                                                         \
 482         write_cr3(efi_scratch.prev_cr3);                                \
 483         __flush_tlb_all();                                              \
 484         local_irq_restore(flags);                                       \
 485                                                                         \
 486         __s;                                                            \
 487 })
 488
 489 efi_status_t efi_thunk_set_virtual_address_map(
 490         void *phys_set_virtual_address_map,
 491         unsigned long memory_map_size,
 492         unsigned long descriptor_size,
 493         u32 descriptor_version,
 494         efi_memory_desc_t *virtual_map)
 495 {
 496         efi_status_t status;
 497         unsigned long flags;
 498         u32 func;
 499
 500         efi_sync_low_kernel_mappings();
 501         local_irq_save(flags);
 502
 503         efi_scratch.prev_cr3 = read_cr3();
 504         write_cr3((unsigned long)efi_scratch.efi_pgt);
 505         __flush_tlb_all();
 506
 507         func = (u32)(unsigned long)phys_set_virtual_address_map;
 508         status = efi64_thunk(func, memory_map_size, descriptor_size,
 509                              descriptor_version, virtual_map);
 510
 511         write_cr3(efi_scratch.prev_cr3);
 512         __flush_tlb_all();
 513         local_irq_restore(flags);
 514
 515         return status;
 516 }
 517
 518 static efi_status_t efi_thunk_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 519 {
 520         efi_status_t status;
 521         u32 phys_tm, phys_tc;
 522
 523         spin_lock(&rtc_lock);
 524
 525         phys_tm = virt_to_phys(tm);
 526         phys_tc = virt_to_phys(tc);
 527
 528         status = efi_thunk(get_time, phys_tm, phys_tc);
 529
 530         spin_unlock(&rtc_lock);
 531
 532         return status;
 533 }
 534
 535 static efi_status_t efi_thunk_set_time(efi_time_t *tm)
 536 {
 537         efi_status_t status;
 538         u32 phys_tm;
 539
 540         spin_lock(&rtc_lock);
 541
 542         phys_tm = virt_to_phys(tm);
 543
 544         status = efi_thunk(set_time, phys_tm);
 545
 546         spin_unlock(&rtc_lock);
 547
 548         return status;
 549 }
 550
 551 static efi_status_t
 552 efi_thunk_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending,
 553                           efi_time_t *tm)
 554 {
 555         efi_status_t status;
 556         u32 phys_enabled, phys_pending, phys_tm;
 557
 558         spin_lock(&rtc_lock);
 559
 560         phys_enabled = virt_to_phys(enabled);
 561         phys_pending = virt_to_phys(pending);
 562         phys_tm = virt_to_phys(tm);
 563
 564         status = efi_thunk(get_wakeup_time, phys_enabled,
 565                              phys_pending, phys_tm);
 566
 567         spin_unlock(&rtc_lock);
 568
 569         return status;
 570 }
 571
 572 static efi_status_t
 573 efi_thunk_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 574 {
 575         efi_status_t status;
 576         u32 phys_tm;
 577
 578         spin_lock(&rtc_lock);
 579
 580         phys_tm = virt_to_phys(tm);
 581
 582         status = efi_thunk(set_wakeup_time, enabled, phys_tm);
 583
 584         spin_unlock(&rtc_lock);
 585
 586         return status;
 587 }
 588
 589
 590 static efi_status_t
 591 efi_thunk_get_variable(efi_char16_t *name, efi_guid_t *vendor,
 592                        u32 *attr, unsigned long *data_size, void *data)
 593 {
 594         efi_status_t status;
 595         u32 phys_name, phys_vendor, phys_attr;
 596         u32 phys_data_size, phys_data;
 597
 598         phys_data_size = virt_to_phys(data_size);
 599         phys_vendor = virt_to_phys(vendor);
 600         phys_name = virt_to_phys(name);
 601         phys_attr = virt_to_phys(attr);
 602         phys_data = virt_to_phys(data);
 603
 604         status = efi_thunk(get_variable, phys_name, phys_vendor,
 605                            phys_attr, phys_data_size, phys_data);
 606
 607         return status;
 608 }
 609
 610 static efi_status_t
 611 efi_thunk_set_variable(efi_char16_t *name, efi_guid_t *vendor,
 612                        u32 attr, unsigned long data_size, void *data)
 613 {
 614         u32 phys_name, phys_vendor, phys_data;
 615         efi_status_t status;
 616
 617         phys_name = virt_to_phys(name);
 618         phys_vendor = virt_to_phys(vendor);
 619         phys_data = virt_to_phys(data);
 620
 621         /* If data_size is > sizeof(u32) we've got problems */
 622         status = efi_thunk(set_variable, phys_name, phys_vendor,
 623                            attr, data_size, phys_data);
 624
 625         return status;
 626 }
 627
 628 static efi_status_t
 629 efi_thunk_get_next_variable(unsigned long *name_size,
 630                             efi_char16_t *name,
 631                             efi_guid_t *vendor)
 632 {
 633         efi_status_t status;
 634         u32 phys_name_size, phys_name, phys_vendor;
 635
 636         phys_name_size = virt_to_phys(name_size);
 637         phys_vendor = virt_to_phys(vendor);
 638         phys_name = virt_to_phys(name);
 639
 640         status = efi_thunk(get_next_variable, phys_name_size,
 641                            phys_name, phys_vendor);
 642
 643         return status;
 644 }
 645
 646 static efi_status_t
 647 efi_thunk_get_next_high_mono_count(u32 *count)
 648 {
 649         efi_status_t status;
 650         u32 phys_count;
 651
 652         phys_count = virt_to_phys(count);
 653         status = efi_thunk(get_next_high_mono_count, phys_count);
 654
 655         return status;
 656 }
 657
 658 static void
 659 efi_thunk_reset_system(int reset_type, efi_status_t status,
 660                        unsigned long data_size, efi_char16_t *data)
 661 {
 662         u32 phys_data;
 663
 664         phys_data = virt_to_phys(data);
 665
 666         efi_thunk(reset_system, reset_type, status, data_size, phys_data);
 667 }
 668
 669 static efi_status_t
 670 efi_thunk_update_capsule(efi_capsule_header_t **capsules,
 671                          unsigned long count, unsigned long sg_list)
 672 {
 673         /*
 674          * To properly support this function we would need to repackage
 675          * 'capsules' because the firmware doesn't understand 64-bit
 676          * pointers.
 677          */
 678         return EFI_UNSUPPORTED;
 679 }
 680
 681 static efi_status_t
 682 efi_thunk_query_variable_info(u32 attr, u64 *storage_space,
 683                               u64 *remaining_space,
 684                               u64 *max_variable_size)
 685 {
 686         efi_status_t status;
 687         u32 phys_storage, phys_remaining, phys_max;
 688
 689         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 690                 return EFI_UNSUPPORTED;
 691
 692         phys_storage = virt_to_phys(storage_space);
 693         phys_remaining = virt_to_phys(remaining_space);
 694         phys_max = virt_to_phys(max_variable_size);
 695
 696         status = efi_thunk(query_variable_info, attr, phys_storage,
 697                            phys_remaining, phys_max);
 698
 699         return status;
 700 }
 701
 702 static efi_status_t
 703 efi_thunk_query_capsule_caps(efi_capsule_header_t **capsules,
 704                              unsigned long count, u64 *max_size,
 705                              int *reset_type)
 706 {
 707         /*
 708          * To properly support this function we would need to repackage
 709          * 'capsules' because the firmware doesn't understand 64-bit
 710          * pointers.
 711          */
 712         return EFI_UNSUPPORTED;
 713 }
 714
 715 void efi_thunk_runtime_setup(void)
 716 {
 717         efi.get_time = efi_thunk_get_time;
 718         efi.set_time = efi_thunk_set_time;
 719         efi.get_wakeup_time = efi_thunk_get_wakeup_time;
 720         efi.set_wakeup_time = efi_thunk_set_wakeup_time;
 721         efi.get_variable = efi_thunk_get_variable;
 722         efi.get_next_variable = efi_thunk_get_next_variable;
 723         efi.set_variable = efi_thunk_set_variable;
 724         efi.get_next_high_mono_count = efi_thunk_get_next_high_mono_count;
 725         efi.reset_system = efi_thunk_reset_system;
 726         efi.query_variable_info = efi_thunk_query_variable_info;
 727         efi.update_capsule = efi_thunk_update_capsule;
 728         efi.query_capsule_caps = efi_thunk_query_capsule_caps;
 729 }
 730 #endif /* CONFIG_EFI_MIXED */