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         void *p;
  59
  60         if (!(__supported_pte_mask & _PAGE_NX))
  61                 return;
  62
  63         /* Make EFI service code area executable */
  64         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
  65                 md = p;
  66                 if (md->type == EFI_RUNTIME_SERVICES_CODE ||
  67                     md->type == EFI_BOOT_SERVICES_CODE)
  68                         efi_set_executable(md, executable);
  69         }
  70 }
  71
  72 pgd_t * __init efi_call_phys_prolog(void)
  73 {
  74         unsigned long vaddress;
  75         pgd_t *save_pgd;
  76
  77         int pgd;
  78         int n_pgds;
  79
  80         if (!efi_enabled(EFI_OLD_MEMMAP)) {
  81                 save_pgd = (pgd_t *)read_cr3();
  82                 write_cr3((unsigned long)efi_scratch.efi_pgt);
  83                 goto out;
  84         }
  85
  86         early_code_mapping_set_exec(1);
  87
  88         n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE);
  89         save_pgd = kmalloc(n_pgds * sizeof(pgd_t), GFP_KERNEL);
  90
  91         for (pgd = 0; pgd < n_pgds; pgd++) {
  92                 save_pgd[pgd] = *pgd_offset_k(pgd * PGDIR_SIZE);
  93                 vaddress = (unsigned long)__va(pgd * PGDIR_SIZE);
  94                 set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), *pgd_offset_k(vaddress));
  95         }
  96 out:
  97         __flush_tlb_all();
  98
  99         return save_pgd;
 100 }
 101
 102 void __init efi_call_phys_epilog(pgd_t *save_pgd)
 103 {
 104         /*
 105          * After the lock is released, the original page table is restored.
 106          */
 107         int pgd_idx;
 108         int nr_pgds;
 109
 110         if (!efi_enabled(EFI_OLD_MEMMAP)) {
 111                 write_cr3((unsigned long)save_pgd);
 112                 __flush_tlb_all();
 113                 return;
 114         }
 115
 116         nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE);
 117
 118         for (pgd_idx = 0; pgd_idx < nr_pgds; pgd_idx++)
 119                 set_pgd(pgd_offset_k(pgd_idx * PGDIR_SIZE), save_pgd[pgd_idx]);
 120
 121         kfree(save_pgd);
 122
 123         __flush_tlb_all();
 124         early_code_mapping_set_exec(0);
 125 }
 126
 127 static pgd_t *efi_pgd;
 128
 129 /*
 130  * We need our own copy of the higher levels of the page tables
 131  * because we want to avoid inserting EFI region mappings (EFI_VA_END
 132  * to EFI_VA_START) into the standard kernel page tables. Everything
 133  * else can be shared, see efi_sync_low_kernel_mappings().
 134  */
 135 int __init efi_alloc_page_tables(void)
 136 {
 137         pgd_t *pgd;
 138         pud_t *pud;
 139         gfp_t gfp_mask;
 140
 141         if (efi_enabled(EFI_OLD_MEMMAP))
 142                 return 0;
 143
 144         gfp_mask = GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO;
 145         efi_pgd = (pgd_t *)__get_free_page(gfp_mask);
 146         if (!efi_pgd)
 147                 return -ENOMEM;
 148
 149         pgd = efi_pgd + pgd_index(EFI_VA_END);
 150
 151         pud = pud_alloc_one(NULL, 0);
 152         if (!pud) {
 153                 free_page((unsigned long)efi_pgd);
 154                 return -ENOMEM;
 155         }
 156
 157         pgd_populate(NULL, pgd, pud);
 158
 159         return 0;
 160 }
 161
 162 /*
 163  * Add low kernel mappings for passing arguments to EFI functions.
 164  */
 165 void efi_sync_low_kernel_mappings(void)
 166 {
 167         unsigned num_entries;
 168         pgd_t *pgd_k, *pgd_efi;
 169         pud_t *pud_k, *pud_efi;
 170
 171         if (efi_enabled(EFI_OLD_MEMMAP))
 172                 return;
 173
 174         /*
 175          * We can share all PGD entries apart from the one entry that
 176          * covers the EFI runtime mapping space.
 177          *
 178          * Make sure the EFI runtime region mappings are guaranteed to
 179          * only span a single PGD entry and that the entry also maps
 180          * other important kernel regions.
 181          */
 182         BUILD_BUG_ON(pgd_index(EFI_VA_END) != pgd_index(MODULES_END));
 183         BUILD_BUG_ON((EFI_VA_START & PGDIR_MASK) !=
 184                         (EFI_VA_END & PGDIR_MASK));
 185
 186         pgd_efi = efi_pgd + pgd_index(PAGE_OFFSET);
 187         pgd_k = pgd_offset_k(PAGE_OFFSET);
 188
 189         num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET);
 190         memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries);
 191
 192         /*
 193          * We share all the PUD entries apart from those that map the
 194          * EFI regions. Copy around them.
 195          */
 196         BUILD_BUG_ON((EFI_VA_START & ~PUD_MASK) != 0);
 197         BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0);
 198
 199         pgd_efi = efi_pgd + pgd_index(EFI_VA_END);
 200         pud_efi = pud_offset(pgd_efi, 0);
 201
 202         pgd_k = pgd_offset_k(EFI_VA_END);
 203         pud_k = pud_offset(pgd_k, 0);
 204
 205         num_entries = pud_index(EFI_VA_END);
 206         memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
 207
 208         pud_efi = pud_offset(pgd_efi, EFI_VA_START);
 209         pud_k = pud_offset(pgd_k, EFI_VA_START);
 210
 211         num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START);
 212         memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
 213 }
 214
 215 int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
 216 {
 217         unsigned long pfn, text;
 218         efi_memory_desc_t *md;
 219         struct page *page;
 220         unsigned npages;
 221         pgd_t *pgd;
 222
 223         if (efi_enabled(EFI_OLD_MEMMAP))
 224                 return 0;
 225
 226         efi_scratch.efi_pgt = (pgd_t *)__pa(efi_pgd);
 227         pgd = efi_pgd;
 228
 229         /*
 230          * It can happen that the physical address of new_memmap lands in memory
 231          * which is not mapped in the EFI page table. Therefore we need to go
 232          * and ident-map those pages containing the map before calling
 233          * phys_efi_set_virtual_address_map().
 234          */
 235         pfn = pa_memmap >> PAGE_SHIFT;
 236         if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, _PAGE_NX | _PAGE_RW)) {
 237                 pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap);
 238                 return 1;
 239         }
 240
 241         efi_scratch.use_pgd = true;
 242
 243         /*
 244          * When making calls to the firmware everything needs to be 1:1
 245          * mapped and addressable with 32-bit pointers. Map the kernel
 246          * text and allocate a new stack because we can't rely on the
 247          * stack pointer being < 4GB.
 248          */
 249         if (!IS_ENABLED(CONFIG_EFI_MIXED))
 250                 return 0;
 251
 252         /*
 253          * Map all of RAM so that we can access arguments in the 1:1
 254          * mapping when making EFI runtime calls.
 255          */
 256         for_each_efi_memory_desc(&memmap, md) {
 257                 if (md->type != EFI_CONVENTIONAL_MEMORY &&
 258                     md->type != EFI_LOADER_DATA &&
 259                     md->type != EFI_LOADER_CODE)
 260                         continue;
 261
 262                 pfn = md->phys_addr >> PAGE_SHIFT;
 263                 npages = md->num_pages;
 264
 265                 if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, npages, _PAGE_RW)) {
 266                         pr_err("Failed to map 1:1 memory\n");
 267                         return 1;
 268                 }
 269         }
 270
 271         page = alloc_page(GFP_KERNEL|__GFP_DMA32);
 272         if (!page)
 273                 panic("Unable to allocate EFI runtime stack < 4GB\n");
 274
 275         efi_scratch.phys_stack = virt_to_phys(page_address(page));
 276         efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */
 277
 278         npages = (_etext - _text) >> PAGE_SHIFT;
 279         text = __pa(_text);
 280         pfn = text >> PAGE_SHIFT;
 281
 282         if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, _PAGE_RW)) {
 283                 pr_err("Failed to map kernel text 1:1\n");
 284                 return 1;
 285         }
 286
 287         return 0;
 288 }
 289
 290 void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages)
 291 {
 292         kernel_unmap_pages_in_pgd(efi_pgd, pa_memmap, num_pages);
 293 }
 294
 295 static void __init __map_region(efi_memory_desc_t *md, u64 va)
 296 {
 297         unsigned long flags = _PAGE_RW;
 298         unsigned long pfn;
 299         pgd_t *pgd = efi_pgd;
 300
 301         if (!(md->attribute & EFI_MEMORY_WB))
 302                 flags |= _PAGE_PCD;
 303
 304         pfn = md->phys_addr >> PAGE_SHIFT;
 305         if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags))
 306                 pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
 307                            md->phys_addr, va);
 308 }
 309
 310 void __init efi_map_region(efi_memory_desc_t *md)
 311 {
 312         unsigned long size = md->num_pages << PAGE_SHIFT;
 313         u64 pa = md->phys_addr;
 314
 315         if (efi_enabled(EFI_OLD_MEMMAP))
 316                 return old_map_region(md);
 317
 318         /*
 319          * Make sure the 1:1 mappings are present as a catch-all for b0rked
 320          * firmware which doesn't update all internal pointers after switching
 321          * to virtual mode and would otherwise crap on us.
 322          */
 323         __map_region(md, md->phys_addr);
 324
 325         /*
 326          * Enforce the 1:1 mapping as the default virtual address when
 327          * booting in EFI mixed mode, because even though we may be
 328          * running a 64-bit kernel, the firmware may only be 32-bit.
 329          */
 330         if (!efi_is_native () && IS_ENABLED(CONFIG_EFI_MIXED)) {
 331                 md->virt_addr = md->phys_addr;
 332                 return;
 333         }
 334
 335         efi_va -= size;
 336
 337         /* Is PA 2M-aligned? */
 338         if (!(pa & (PMD_SIZE - 1))) {
 339                 efi_va &= PMD_MASK;
 340         } else {
 341                 u64 pa_offset = pa & (PMD_SIZE - 1);
 342                 u64 prev_va = efi_va;
 343
 344                 /* get us the same offset within this 2M page */
 345                 efi_va = (efi_va & PMD_MASK) + pa_offset;
 346
 347                 if (efi_va > prev_va)
 348                         efi_va -= PMD_SIZE;
 349         }
 350
 351         if (efi_va < EFI_VA_END) {
 352                 pr_warn(FW_WARN "VA address range overflow!\n");
 353                 return;
 354         }
 355
 356         /* Do the VA map */
 357         __map_region(md, efi_va);
 358         md->virt_addr = efi_va;
 359 }
 360
 361 /*
 362  * kexec kernel will use efi_map_region_fixed to map efi runtime memory ranges.
 363  * md->virt_addr is the original virtual address which had been mapped in kexec
 364  * 1st kernel.
 365  */
 366 void __init efi_map_region_fixed(efi_memory_desc_t *md)
 367 {
 368         __map_region(md, md->virt_addr);
 369 }
 370
 371 void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
 372                                  u32 type, u64 attribute)
 373 {
 374         unsigned long last_map_pfn;
 375
 376         if (type == EFI_MEMORY_MAPPED_IO)
 377                 return ioremap(phys_addr, size);
 378
 379         last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
 380         if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
 381                 unsigned long top = last_map_pfn << PAGE_SHIFT;
 382                 efi_ioremap(top, size - (top - phys_addr), type, attribute);
 383         }
 384
 385         if (!(attribute & EFI_MEMORY_WB))
 386                 efi_memory_uc((u64)(unsigned long)__va(phys_addr), size);
 387
 388         return (void __iomem *)__va(phys_addr);
 389 }
 390
 391 void __init parse_efi_setup(u64 phys_addr, u32 data_len)
 392 {
 393         efi_setup = phys_addr + sizeof(struct setup_data);
 394 }
 395
 396 void __init efi_runtime_update_mappings(void)
 397 {
 398         unsigned long pfn;
 399         pgd_t *pgd = efi_pgd;
 400         efi_memory_desc_t *md;
 401         void *p;
 402
 403         if (efi_enabled(EFI_OLD_MEMMAP)) {
 404                 if (__supported_pte_mask & _PAGE_NX)
 405                         runtime_code_page_mkexec();
 406                 return;
 407         }
 408
 409         if (!efi_enabled(EFI_NX_PE_DATA))
 410                 return;
 411
 412         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 413                 unsigned long pf = 0;
 414                 md = p;
 415
 416                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 417                         continue;
 418
 419                 if (!(md->attribute & EFI_MEMORY_WB))
 420                         pf |= _PAGE_PCD;
 421
 422                 if ((md->attribute & EFI_MEMORY_XP) ||
 423                         (md->type == EFI_RUNTIME_SERVICES_DATA))
 424                         pf |= _PAGE_NX;
 425
 426                 if (!(md->attribute & EFI_MEMORY_RO) &&
 427                         (md->type != EFI_RUNTIME_SERVICES_CODE))
 428                         pf |= _PAGE_RW;
 429
 430                 /* Update the 1:1 mapping */
 431                 pfn = md->phys_addr >> PAGE_SHIFT;
 432                 if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_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                 if (kernel_map_pages_in_pgd(pgd, pfn, md->virt_addr, md->num_pages, pf))
 437                         pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
 438                                    md->phys_addr, md->virt_addr);
 439         }
 440 }
 441
 442 void __init efi_dump_pagetable(void)
 443 {
 444 #ifdef CONFIG_EFI_PGT_DUMP
 445         ptdump_walk_pgd_level(NULL, efi_pgd);
 446 #endif
 447 }
 448
 449 #ifdef CONFIG_EFI_MIXED
 450 extern efi_status_t efi64_thunk(u32, ...);
 451
 452 #define runtime_service32(func)                                          \
 453 ({                                                                       \
 454         u32 table = (u32)(unsigned long)efi.systab;                      \
 455         u32 *rt, *___f;                                                  \
 456                                                                          \
 457         rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime));  \
 458         ___f = (u32 *)(*rt + offsetof(efi_runtime_services_32_t, func)); \
 459         *___f;                                                           \
 460 })
 461
 462 /*
 463  * Switch to the EFI page tables early so that we can access the 1:1
 464  * runtime services mappings which are not mapped in any other page
 465  * tables. This function must be called before runtime_service32().
 466  *
 467  * Also, disable interrupts because the IDT points to 64-bit handlers,
 468  * which aren't going to function correctly when we switch to 32-bit.
 469  */
 470 #define efi_thunk(f, ...)                                               \
 471 ({                                                                      \
 472         efi_status_t __s;                                               \
 473         unsigned long flags;                                            \
 474         u32 func;                                                       \
 475                                                                         \
 476         efi_sync_low_kernel_mappings();                                 \
 477         local_irq_save(flags);                                          \
 478                                                                         \
 479         efi_scratch.prev_cr3 = read_cr3();                              \
 480         write_cr3((unsigned long)efi_scratch.efi_pgt);                  \
 481         __flush_tlb_all();                                              \
 482                                                                         \
 483         func = runtime_service32(f);                                    \
 484         __s = efi64_thunk(func, __VA_ARGS__);                   \
 485                                                                         \
 486         write_cr3(efi_scratch.prev_cr3);                                \
 487         __flush_tlb_all();                                              \
 488         local_irq_restore(flags);                                       \
 489                                                                         \
 490         __s;                                                            \
 491 })
 492
 493 efi_status_t efi_thunk_set_virtual_address_map(
 494         void *phys_set_virtual_address_map,
 495         unsigned long memory_map_size,
 496         unsigned long descriptor_size,
 497         u32 descriptor_version,
 498         efi_memory_desc_t *virtual_map)
 499 {
 500         efi_status_t status;
 501         unsigned long flags;
 502         u32 func;
 503
 504         efi_sync_low_kernel_mappings();
 505         local_irq_save(flags);
 506
 507         efi_scratch.prev_cr3 = read_cr3();
 508         write_cr3((unsigned long)efi_scratch.efi_pgt);
 509         __flush_tlb_all();
 510
 511         func = (u32)(unsigned long)phys_set_virtual_address_map;
 512         status = efi64_thunk(func, memory_map_size, descriptor_size,
 513                              descriptor_version, virtual_map);
 514
 515         write_cr3(efi_scratch.prev_cr3);
 516         __flush_tlb_all();
 517         local_irq_restore(flags);
 518
 519         return status;
 520 }
 521
 522 static efi_status_t efi_thunk_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 523 {
 524         efi_status_t status;
 525         u32 phys_tm, phys_tc;
 526
 527         spin_lock(&rtc_lock);
 528
 529         phys_tm = virt_to_phys(tm);
 530         phys_tc = virt_to_phys(tc);
 531
 532         status = efi_thunk(get_time, phys_tm, phys_tc);
 533
 534         spin_unlock(&rtc_lock);
 535
 536         return status;
 537 }
 538
 539 static efi_status_t efi_thunk_set_time(efi_time_t *tm)
 540 {
 541         efi_status_t status;
 542         u32 phys_tm;
 543
 544         spin_lock(&rtc_lock);
 545
 546         phys_tm = virt_to_phys(tm);
 547
 548         status = efi_thunk(set_time, phys_tm);
 549
 550         spin_unlock(&rtc_lock);
 551
 552         return status;
 553 }
 554
 555 static efi_status_t
 556 efi_thunk_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending,
 557                           efi_time_t *tm)
 558 {
 559         efi_status_t status;
 560         u32 phys_enabled, phys_pending, phys_tm;
 561
 562         spin_lock(&rtc_lock);
 563
 564         phys_enabled = virt_to_phys(enabled);
 565         phys_pending = virt_to_phys(pending);
 566         phys_tm = virt_to_phys(tm);
 567
 568         status = efi_thunk(get_wakeup_time, phys_enabled,
 569                              phys_pending, phys_tm);
 570
 571         spin_unlock(&rtc_lock);
 572
 573         return status;
 574 }
 575
 576 static efi_status_t
 577 efi_thunk_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 578 {
 579         efi_status_t status;
 580         u32 phys_tm;
 581
 582         spin_lock(&rtc_lock);
 583
 584         phys_tm = virt_to_phys(tm);
 585
 586         status = efi_thunk(set_wakeup_time, enabled, phys_tm);
 587
 588         spin_unlock(&rtc_lock);
 589
 590         return status;
 591 }
 592
 593
 594 static efi_status_t
 595 efi_thunk_get_variable(efi_char16_t *name, efi_guid_t *vendor,
 596                        u32 *attr, unsigned long *data_size, void *data)
 597 {
 598         efi_status_t status;
 599         u32 phys_name, phys_vendor, phys_attr;
 600         u32 phys_data_size, phys_data;
 601
 602         phys_data_size = virt_to_phys(data_size);
 603         phys_vendor = virt_to_phys(vendor);
 604         phys_name = virt_to_phys(name);
 605         phys_attr = virt_to_phys(attr);
 606         phys_data = virt_to_phys(data);
 607
 608         status = efi_thunk(get_variable, phys_name, phys_vendor,
 609                            phys_attr, phys_data_size, phys_data);
 610
 611         return status;
 612 }
 613
 614 static efi_status_t
 615 efi_thunk_set_variable(efi_char16_t *name, efi_guid_t *vendor,
 616                        u32 attr, unsigned long data_size, void *data)
 617 {
 618         u32 phys_name, phys_vendor, phys_data;
 619         efi_status_t status;
 620
 621         phys_name = virt_to_phys(name);
 622         phys_vendor = virt_to_phys(vendor);
 623         phys_data = virt_to_phys(data);
 624
 625         /* If data_size is > sizeof(u32) we've got problems */
 626         status = efi_thunk(set_variable, phys_name, phys_vendor,
 627                            attr, data_size, phys_data);
 628
 629         return status;
 630 }
 631
 632 static efi_status_t
 633 efi_thunk_get_next_variable(unsigned long *name_size,
 634                             efi_char16_t *name,
 635                             efi_guid_t *vendor)
 636 {
 637         efi_status_t status;
 638         u32 phys_name_size, phys_name, phys_vendor;
 639
 640         phys_name_size = virt_to_phys(name_size);
 641         phys_vendor = virt_to_phys(vendor);
 642         phys_name = virt_to_phys(name);
 643
 644         status = efi_thunk(get_next_variable, phys_name_size,
 645                            phys_name, phys_vendor);
 646
 647         return status;
 648 }
 649
 650 static efi_status_t
 651 efi_thunk_get_next_high_mono_count(u32 *count)
 652 {
 653         efi_status_t status;
 654         u32 phys_count;
 655
 656         phys_count = virt_to_phys(count);
 657         status = efi_thunk(get_next_high_mono_count, phys_count);
 658
 659         return status;
 660 }
 661
 662 static void
 663 efi_thunk_reset_system(int reset_type, efi_status_t status,
 664                        unsigned long data_size, efi_char16_t *data)
 665 {
 666         u32 phys_data;
 667
 668         phys_data = virt_to_phys(data);
 669
 670         efi_thunk(reset_system, reset_type, status, data_size, phys_data);
 671 }
 672
 673 static efi_status_t
 674 efi_thunk_update_capsule(efi_capsule_header_t **capsules,
 675                          unsigned long count, unsigned long sg_list)
 676 {
 677         /*
 678          * To properly support this function we would need to repackage
 679          * 'capsules' because the firmware doesn't understand 64-bit
 680          * pointers.
 681          */
 682         return EFI_UNSUPPORTED;
 683 }
 684
 685 static efi_status_t
 686 efi_thunk_query_variable_info(u32 attr, u64 *storage_space,
 687                               u64 *remaining_space,
 688                               u64 *max_variable_size)
 689 {
 690         efi_status_t status;
 691         u32 phys_storage, phys_remaining, phys_max;
 692
 693         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 694                 return EFI_UNSUPPORTED;
 695
 696         phys_storage = virt_to_phys(storage_space);
 697         phys_remaining = virt_to_phys(remaining_space);
 698         phys_max = virt_to_phys(max_variable_size);
 699
 700         status = efi_thunk(query_variable_info, attr, phys_storage,
 701                            phys_remaining, phys_max);
 702
 703         return status;
 704 }
 705
 706 static efi_status_t
 707 efi_thunk_query_capsule_caps(efi_capsule_header_t **capsules,
 708                              unsigned long count, u64 *max_size,
 709                              int *reset_type)
 710 {
 711         /*
 712          * To properly support this function we would need to repackage
 713          * 'capsules' because the firmware doesn't understand 64-bit
 714          * pointers.
 715          */
 716         return EFI_UNSUPPORTED;
 717 }
 718
 719 void efi_thunk_runtime_setup(void)
 720 {
 721         efi.get_time = efi_thunk_get_time;
 722         efi.set_time = efi_thunk_set_time;
 723         efi.get_wakeup_time = efi_thunk_get_wakeup_time;
 724         efi.set_wakeup_time = efi_thunk_set_wakeup_time;
 725         efi.get_variable = efi_thunk_get_variable;
 726         efi.get_next_variable = efi_thunk_get_next_variable;
 727         efi.set_variable = efi_thunk_set_variable;
 728         efi.get_next_high_mono_count = efi_thunk_get_next_high_mono_count;
 729         efi.reset_system = efi_thunk_reset_system;
 730         efi.query_variable_info = efi_thunk_query_variable_info;
 731         efi.update_capsule = efi_thunk_update_capsule;
 732         efi.query_capsule_caps = efi_thunk_query_capsule_caps;
 733 }
 734 #endif /* CONFIG_EFI_MIXED */