1 // SPDX-License-Identifier: GPL-2.0-only
3 * Re-map IO memory to kernel address space so that we can access it.
4 * This is needed for high PCI addresses that aren't mapped in the
5 * 640k-1MB IO memory area on PC's
7 * (C) Copyright 1995 1996 Linus Torvalds
10 #include <linux/memblock.h>
11 #include <linux/init.h>
13 #include <linux/ioport.h>
14 #include <linux/slab.h>
15 #include <linux/vmalloc.h>
16 #include <linux/mmiotrace.h>
17 #include <linux/mem_encrypt.h>
18 #include <linux/efi.h>
19 #include <linux/pgtable.h>
21 #include <asm/set_memory.h>
22 #include <asm/e820/api.h>
24 #include <asm/fixmap.h>
25 #include <asm/tlbflush.h>
26 #include <asm/pgalloc.h>
27 #include <asm/memtype.h>
28 #include <asm/setup.h>
33 * Descriptor controlling ioremap() behavior.
40 * Fix up the linear direct mapping of the kernel to avoid cache attribute
43 int ioremap_change_attr(unsigned long vaddr, unsigned long size,
44 enum page_cache_mode pcm)
46 unsigned long nrpages = size >> PAGE_SHIFT;
50 case _PAGE_CACHE_MODE_UC:
52 err = _set_memory_uc(vaddr, nrpages);
54 case _PAGE_CACHE_MODE_WC:
55 err = _set_memory_wc(vaddr, nrpages);
57 case _PAGE_CACHE_MODE_WT:
58 err = _set_memory_wt(vaddr, nrpages);
60 case _PAGE_CACHE_MODE_WB:
61 err = _set_memory_wb(vaddr, nrpages);
68 /* Does the range (or a subset of) contain normal RAM? */
69 static unsigned int __ioremap_check_ram(struct resource *res)
71 unsigned long start_pfn, stop_pfn;
74 if ((res->flags & IORESOURCE_SYSTEM_RAM) != IORESOURCE_SYSTEM_RAM)
77 start_pfn = (res->start + PAGE_SIZE - 1) >> PAGE_SHIFT;
78 stop_pfn = (res->end + 1) >> PAGE_SHIFT;
79 if (stop_pfn > start_pfn) {
80 for (i = 0; i < (stop_pfn - start_pfn); ++i)
81 if (pfn_valid(start_pfn + i) &&
82 !PageReserved(pfn_to_page(start_pfn + i)))
83 return IORES_MAP_SYSTEM_RAM;
90 * In a SEV guest, NONE and RESERVED should not be mapped encrypted because
91 * there the whole memory is already encrypted.
93 static unsigned int __ioremap_check_encrypted(struct resource *res)
100 case IORES_DESC_RESERVED:
103 return IORES_MAP_ENCRYPTED;
110 * The EFI runtime services data area is not covered by walk_mem_res(), but must
111 * be mapped encrypted when SEV is active.
113 static void __ioremap_check_other(resource_size_t addr, struct ioremap_desc *desc)
118 if (!IS_ENABLED(CONFIG_EFI))
121 if (efi_mem_type(addr) == EFI_RUNTIME_SERVICES_DATA ||
122 (efi_mem_type(addr) == EFI_BOOT_SERVICES_DATA &&
123 efi_mem_attributes(addr) & EFI_MEMORY_RUNTIME))
124 desc->flags |= IORES_MAP_ENCRYPTED;
127 static int __ioremap_collect_map_flags(struct resource *res, void *arg)
129 struct ioremap_desc *desc = arg;
131 if (!(desc->flags & IORES_MAP_SYSTEM_RAM))
132 desc->flags |= __ioremap_check_ram(res);
134 if (!(desc->flags & IORES_MAP_ENCRYPTED))
135 desc->flags |= __ioremap_check_encrypted(res);
137 return ((desc->flags & (IORES_MAP_SYSTEM_RAM | IORES_MAP_ENCRYPTED)) ==
138 (IORES_MAP_SYSTEM_RAM | IORES_MAP_ENCRYPTED));
142 * To avoid multiple resource walks, this function walks resources marked as
143 * IORESOURCE_MEM and IORESOURCE_BUSY and looking for system RAM and/or a
144 * resource described not as IORES_DESC_NONE (e.g. IORES_DESC_ACPI_TABLES).
146 * After that, deal with misc other ranges in __ioremap_check_other() which do
147 * not fall into the above category.
149 static void __ioremap_check_mem(resource_size_t addr, unsigned long size,
150 struct ioremap_desc *desc)
155 end = start + size - 1;
156 memset(desc, 0, sizeof(struct ioremap_desc));
158 walk_mem_res(start, end, desc, __ioremap_collect_map_flags);
160 __ioremap_check_other(addr, desc);
164 * Remap an arbitrary physical address space into the kernel virtual
165 * address space. It transparently creates kernel huge I/O mapping when
166 * the physical address is aligned by a huge page size (1GB or 2MB) and
167 * the requested size is at least the huge page size.
169 * NOTE: MTRRs can override PAT memory types with a 4KB granularity.
170 * Therefore, the mapping code falls back to use a smaller page toward 4KB
171 * when a mapping range is covered by non-WB type of MTRRs.
173 * NOTE! We need to allow non-page-aligned mappings too: we will obviously
174 * have to convert them into an offset in a page-aligned mapping, but the
175 * caller shouldn't need to know that small detail.
177 static void __iomem *
178 __ioremap_caller(resource_size_t phys_addr, unsigned long size,
179 enum page_cache_mode pcm, void *caller, bool encrypted)
181 unsigned long offset, vaddr;
182 resource_size_t last_addr;
183 const resource_size_t unaligned_phys_addr = phys_addr;
184 const unsigned long unaligned_size = size;
185 struct ioremap_desc io_desc;
186 struct vm_struct *area;
187 enum page_cache_mode new_pcm;
190 void __iomem *ret_addr;
192 /* Don't allow wraparound or zero size */
193 last_addr = phys_addr + size - 1;
194 if (!size || last_addr < phys_addr)
197 if (!phys_addr_valid(phys_addr)) {
198 printk(KERN_WARNING "ioremap: invalid physical address %llx\n",
199 (unsigned long long)phys_addr);
204 __ioremap_check_mem(phys_addr, size, &io_desc);
207 * Don't allow anybody to remap normal RAM that we're using..
209 if (io_desc.flags & IORES_MAP_SYSTEM_RAM) {
210 WARN_ONCE(1, "ioremap on RAM at %pa - %pa\n",
211 &phys_addr, &last_addr);
216 * Mappings have to be page-aligned
218 offset = phys_addr & ~PAGE_MASK;
219 phys_addr &= PAGE_MASK;
220 size = PAGE_ALIGN(last_addr+1) - phys_addr;
223 * Mask out any bits not part of the actual physical
224 * address, like memory encryption bits.
226 phys_addr &= PHYSICAL_PAGE_MASK;
228 retval = memtype_reserve(phys_addr, (u64)phys_addr + size,
231 printk(KERN_ERR "ioremap memtype_reserve failed %d\n", retval);
235 if (pcm != new_pcm) {
236 if (!is_new_memtype_allowed(phys_addr, size, pcm, new_pcm)) {
238 "ioremap error for 0x%llx-0x%llx, requested 0x%x, got 0x%x\n",
239 (unsigned long long)phys_addr,
240 (unsigned long long)(phys_addr + size),
242 goto err_free_memtype;
248 * If the page being mapped is in memory and SEV is active then
249 * make sure the memory encryption attribute is enabled in the
252 prot = PAGE_KERNEL_IO;
253 if ((io_desc.flags & IORES_MAP_ENCRYPTED) || encrypted)
254 prot = pgprot_encrypted(prot);
257 case _PAGE_CACHE_MODE_UC:
259 prot = __pgprot(pgprot_val(prot) |
260 cachemode2protval(_PAGE_CACHE_MODE_UC));
262 case _PAGE_CACHE_MODE_UC_MINUS:
263 prot = __pgprot(pgprot_val(prot) |
264 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS));
266 case _PAGE_CACHE_MODE_WC:
267 prot = __pgprot(pgprot_val(prot) |
268 cachemode2protval(_PAGE_CACHE_MODE_WC));
270 case _PAGE_CACHE_MODE_WT:
271 prot = __pgprot(pgprot_val(prot) |
272 cachemode2protval(_PAGE_CACHE_MODE_WT));
274 case _PAGE_CACHE_MODE_WB:
281 area = get_vm_area_caller(size, VM_IOREMAP, caller);
283 goto err_free_memtype;
284 area->phys_addr = phys_addr;
285 vaddr = (unsigned long) area->addr;
287 if (memtype_kernel_map_sync(phys_addr, size, pcm))
290 if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot))
293 ret_addr = (void __iomem *) (vaddr + offset);
294 mmiotrace_ioremap(unaligned_phys_addr, unaligned_size, ret_addr);
297 * Check if the request spans more than any BAR in the iomem resource
300 if (iomem_map_sanity_check(unaligned_phys_addr, unaligned_size))
301 pr_warn("caller %pS mapping multiple BARs\n", caller);
307 memtype_free(phys_addr, phys_addr + size);
312 * ioremap - map bus memory into CPU space
313 * @phys_addr: bus address of the memory
314 * @size: size of the resource to map
316 * ioremap performs a platform specific sequence of operations to
317 * make bus memory CPU accessible via the readb/readw/readl/writeb/
318 * writew/writel functions and the other mmio helpers. The returned
319 * address is not guaranteed to be usable directly as a virtual
322 * This version of ioremap ensures that the memory is marked uncachable
323 * on the CPU as well as honouring existing caching rules from things like
324 * the PCI bus. Note that there are other caches and buffers on many
325 * busses. In particular driver authors should read up on PCI writes
327 * It's useful if some control registers are in such an area and
328 * write combining or read caching is not desirable:
330 * Must be freed with iounmap.
332 void __iomem *ioremap(resource_size_t phys_addr, unsigned long size)
335 * Ideally, this should be:
336 * pat_enabled() ? _PAGE_CACHE_MODE_UC : _PAGE_CACHE_MODE_UC_MINUS;
338 * Till we fix all X drivers to use ioremap_wc(), we will use
339 * UC MINUS. Drivers that are certain they need or can already
340 * be converted over to strong UC can use ioremap_uc().
342 enum page_cache_mode pcm = _PAGE_CACHE_MODE_UC_MINUS;
344 return __ioremap_caller(phys_addr, size, pcm,
345 __builtin_return_address(0), false);
347 EXPORT_SYMBOL(ioremap);
350 * ioremap_uc - map bus memory into CPU space as strongly uncachable
351 * @phys_addr: bus address of the memory
352 * @size: size of the resource to map
354 * ioremap_uc performs a platform specific sequence of operations to
355 * make bus memory CPU accessible via the readb/readw/readl/writeb/
356 * writew/writel functions and the other mmio helpers. The returned
357 * address is not guaranteed to be usable directly as a virtual
360 * This version of ioremap ensures that the memory is marked with a strong
361 * preference as completely uncachable on the CPU when possible. For non-PAT
362 * systems this ends up setting page-attribute flags PCD=1, PWT=1. For PAT
363 * systems this will set the PAT entry for the pages as strong UC. This call
364 * will honor existing caching rules from things like the PCI bus. Note that
365 * there are other caches and buffers on many busses. In particular driver
366 * authors should read up on PCI writes.
368 * It's useful if some control registers are in such an area and
369 * write combining or read caching is not desirable:
371 * Must be freed with iounmap.
373 void __iomem *ioremap_uc(resource_size_t phys_addr, unsigned long size)
375 enum page_cache_mode pcm = _PAGE_CACHE_MODE_UC;
377 return __ioremap_caller(phys_addr, size, pcm,
378 __builtin_return_address(0), false);
380 EXPORT_SYMBOL_GPL(ioremap_uc);
383 * ioremap_wc - map memory into CPU space write combined
384 * @phys_addr: bus address of the memory
385 * @size: size of the resource to map
387 * This version of ioremap ensures that the memory is marked write combining.
388 * Write combining allows faster writes to some hardware devices.
390 * Must be freed with iounmap.
392 void __iomem *ioremap_wc(resource_size_t phys_addr, unsigned long size)
394 return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WC,
395 __builtin_return_address(0), false);
397 EXPORT_SYMBOL(ioremap_wc);
400 * ioremap_wt - map memory into CPU space write through
401 * @phys_addr: bus address of the memory
402 * @size: size of the resource to map
404 * This version of ioremap ensures that the memory is marked write through.
405 * Write through stores data into memory while keeping the cache up-to-date.
407 * Must be freed with iounmap.
409 void __iomem *ioremap_wt(resource_size_t phys_addr, unsigned long size)
411 return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WT,
412 __builtin_return_address(0), false);
414 EXPORT_SYMBOL(ioremap_wt);
416 void __iomem *ioremap_encrypted(resource_size_t phys_addr, unsigned long size)
418 return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WB,
419 __builtin_return_address(0), true);
421 EXPORT_SYMBOL(ioremap_encrypted);
423 void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size)
425 return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WB,
426 __builtin_return_address(0), false);
428 EXPORT_SYMBOL(ioremap_cache);
430 void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size,
431 unsigned long prot_val)
433 return __ioremap_caller(phys_addr, size,
434 pgprot2cachemode(__pgprot(prot_val)),
435 __builtin_return_address(0), false);
437 EXPORT_SYMBOL(ioremap_prot);
440 * iounmap - Free a IO remapping
441 * @addr: virtual address from ioremap_*
443 * Caller must ensure there is only one unmapping for the same pointer.
445 void iounmap(volatile void __iomem *addr)
447 struct vm_struct *p, *o;
449 if ((void __force *)addr <= high_memory)
453 * The PCI/ISA range special-casing was removed from __ioremap()
454 * so this check, in theory, can be removed. However, there are
455 * cases where iounmap() is called for addresses not obtained via
456 * ioremap() (vga16fb for example). Add a warning so that these
457 * cases can be caught and fixed.
459 if ((void __force *)addr >= phys_to_virt(ISA_START_ADDRESS) &&
460 (void __force *)addr < phys_to_virt(ISA_END_ADDRESS)) {
461 WARN(1, "iounmap() called for ISA range not obtained using ioremap()\n");
465 mmiotrace_iounmap(addr);
467 addr = (volatile void __iomem *)
468 (PAGE_MASK & (unsigned long __force)addr);
470 /* Use the vm area unlocked, assuming the caller
471 ensures there isn't another iounmap for the same address
472 in parallel. Reuse of the virtual address is prevented by
473 leaving it in the global lists until we're done with it.
474 cpa takes care of the direct mappings. */
475 p = find_vm_area((void __force *)addr);
478 printk(KERN_ERR "iounmap: bad address %p\n", addr);
483 memtype_free(p->phys_addr, p->phys_addr + get_vm_area_size(p));
485 /* Finally remove it */
486 o = remove_vm_area((void __force *)addr);
487 BUG_ON(p != o || o == NULL);
490 EXPORT_SYMBOL(iounmap);
493 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
496 void *xlate_dev_mem_ptr(phys_addr_t phys)
498 unsigned long start = phys & PAGE_MASK;
499 unsigned long offset = phys & ~PAGE_MASK;
502 /* memremap() maps if RAM, otherwise falls back to ioremap() */
503 vaddr = memremap(start, PAGE_SIZE, MEMREMAP_WB);
505 /* Only add the offset on success and return NULL if memremap() failed */
512 void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
514 memunmap((void *)((unsigned long)addr & PAGE_MASK));
518 * Examine the physical address to determine if it is an area of memory
519 * that should be mapped decrypted. If the memory is not part of the
520 * kernel usable area it was accessed and created decrypted, so these
521 * areas should be mapped decrypted. And since the encryption key can
522 * change across reboots, persistent memory should also be mapped
525 * If SEV is active, that implies that BIOS/UEFI also ran encrypted so
526 * only persistent memory should be mapped decrypted.
528 static bool memremap_should_map_decrypted(resource_size_t phys_addr,
534 * Check if the address is part of a persistent memory region.
535 * This check covers areas added by E820, EFI and ACPI.
537 is_pmem = region_intersects(phys_addr, size, IORESOURCE_MEM,
538 IORES_DESC_PERSISTENT_MEMORY);
539 if (is_pmem != REGION_DISJOINT)
543 * Check if the non-volatile attribute is set for an EFI
546 if (efi_enabled(EFI_BOOT)) {
547 switch (efi_mem_type(phys_addr)) {
548 case EFI_RESERVED_TYPE:
549 if (efi_mem_attributes(phys_addr) & EFI_MEMORY_NV)
557 /* Check if the address is outside kernel usable area */
558 switch (e820__get_entry_type(phys_addr, phys_addr + size - 1)) {
559 case E820_TYPE_RESERVED:
562 case E820_TYPE_UNUSABLE:
563 /* For SEV, these areas are encrypted */
578 * Examine the physical address to determine if it is EFI data. Check
579 * it against the boot params structure and EFI tables and memory types.
581 static bool memremap_is_efi_data(resource_size_t phys_addr,
586 /* Check if the address is part of EFI boot/runtime data */
587 if (!efi_enabled(EFI_BOOT))
590 paddr = boot_params.efi_info.efi_memmap_hi;
592 paddr |= boot_params.efi_info.efi_memmap;
593 if (phys_addr == paddr)
596 paddr = boot_params.efi_info.efi_systab_hi;
598 paddr |= boot_params.efi_info.efi_systab;
599 if (phys_addr == paddr)
602 if (efi_is_table_address(phys_addr))
605 switch (efi_mem_type(phys_addr)) {
606 case EFI_BOOT_SERVICES_DATA:
607 case EFI_RUNTIME_SERVICES_DATA:
617 * Examine the physical address to determine if it is boot data by checking
618 * it against the boot params setup_data chain.
620 static bool memremap_is_setup_data(resource_size_t phys_addr,
623 struct setup_indirect *indirect;
624 struct setup_data *data;
625 u64 paddr, paddr_next;
627 paddr = boot_params.hdr.setup_data;
631 if (phys_addr == paddr)
634 data = memremap(paddr, sizeof(*data),
635 MEMREMAP_WB | MEMREMAP_DEC);
637 pr_warn("failed to memremap setup_data entry\n");
641 paddr_next = data->next;
644 if ((phys_addr > paddr) && (phys_addr < (paddr + len))) {
649 if (data->type == SETUP_INDIRECT) {
651 data = memremap(paddr, sizeof(*data) + len,
652 MEMREMAP_WB | MEMREMAP_DEC);
654 pr_warn("failed to memremap indirect setup_data\n");
658 indirect = (struct setup_indirect *)data->data;
660 if (indirect->type != SETUP_INDIRECT) {
661 paddr = indirect->addr;
668 if ((phys_addr > paddr) && (phys_addr < (paddr + len)))
678 * Examine the physical address to determine if it is boot data by checking
679 * it against the boot params setup_data chain (early boot version).
681 static bool __init early_memremap_is_setup_data(resource_size_t phys_addr,
684 struct setup_indirect *indirect;
685 struct setup_data *data;
686 u64 paddr, paddr_next;
688 paddr = boot_params.hdr.setup_data;
690 unsigned int len, size;
692 if (phys_addr == paddr)
695 data = early_memremap_decrypted(paddr, sizeof(*data));
697 pr_warn("failed to early memremap setup_data entry\n");
701 size = sizeof(*data);
703 paddr_next = data->next;
706 if ((phys_addr > paddr) && (phys_addr < (paddr + len))) {
707 early_memunmap(data, sizeof(*data));
711 if (data->type == SETUP_INDIRECT) {
713 early_memunmap(data, sizeof(*data));
714 data = early_memremap_decrypted(paddr, size);
716 pr_warn("failed to early memremap indirect setup_data\n");
720 indirect = (struct setup_indirect *)data->data;
722 if (indirect->type != SETUP_INDIRECT) {
723 paddr = indirect->addr;
728 early_memunmap(data, size);
730 if ((phys_addr > paddr) && (phys_addr < (paddr + len)))
740 * Architecture function to determine if RAM remap is allowed. By default, a
741 * RAM remap will map the data as encrypted. Determine if a RAM remap should
742 * not be done so that the data will be mapped decrypted.
744 bool arch_memremap_can_ram_remap(resource_size_t phys_addr, unsigned long size,
747 if (!mem_encrypt_active())
750 if (flags & MEMREMAP_ENC)
753 if (flags & MEMREMAP_DEC)
757 if (memremap_is_setup_data(phys_addr, size) ||
758 memremap_is_efi_data(phys_addr, size))
762 return !memremap_should_map_decrypted(phys_addr, size);
766 * Architecture override of __weak function to adjust the protection attributes
767 * used when remapping memory. By default, early_memremap() will map the data
768 * as encrypted. Determine if an encrypted mapping should not be done and set
769 * the appropriate protection attributes.
771 pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
777 if (!mem_encrypt_active())
780 encrypted_prot = true;
783 if (early_memremap_is_setup_data(phys_addr, size) ||
784 memremap_is_efi_data(phys_addr, size))
785 encrypted_prot = false;
788 if (encrypted_prot && memremap_should_map_decrypted(phys_addr, size))
789 encrypted_prot = false;
791 return encrypted_prot ? pgprot_encrypted(prot)
792 : pgprot_decrypted(prot);
795 bool phys_mem_access_encrypted(unsigned long phys_addr, unsigned long size)
797 return arch_memremap_can_ram_remap(phys_addr, size, 0);
800 #ifdef CONFIG_AMD_MEM_ENCRYPT
801 /* Remap memory with encryption */
802 void __init *early_memremap_encrypted(resource_size_t phys_addr,
805 return early_memremap_prot(phys_addr, size, __PAGE_KERNEL_ENC);
809 * Remap memory with encryption and write-protected - cannot be called
810 * before pat_init() is called
812 void __init *early_memremap_encrypted_wp(resource_size_t phys_addr,
815 if (!x86_has_pat_wp())
817 return early_memremap_prot(phys_addr, size, __PAGE_KERNEL_ENC_WP);
820 /* Remap memory without encryption */
821 void __init *early_memremap_decrypted(resource_size_t phys_addr,
824 return early_memremap_prot(phys_addr, size, __PAGE_KERNEL_NOENC);
828 * Remap memory without encryption and write-protected - cannot be called
829 * before pat_init() is called
831 void __init *early_memremap_decrypted_wp(resource_size_t phys_addr,
834 if (!x86_has_pat_wp())
836 return early_memremap_prot(phys_addr, size, __PAGE_KERNEL_NOENC_WP);
838 #endif /* CONFIG_AMD_MEM_ENCRYPT */
840 static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] __page_aligned_bss;
842 static inline pmd_t * __init early_ioremap_pmd(unsigned long addr)
844 /* Don't assume we're using swapper_pg_dir at this point */
845 pgd_t *base = __va(read_cr3_pa());
846 pgd_t *pgd = &base[pgd_index(addr)];
847 p4d_t *p4d = p4d_offset(pgd, addr);
848 pud_t *pud = pud_offset(p4d, addr);
849 pmd_t *pmd = pmd_offset(pud, addr);
854 static inline pte_t * __init early_ioremap_pte(unsigned long addr)
856 return &bm_pte[pte_index(addr)];
859 bool __init is_early_ioremap_ptep(pte_t *ptep)
861 return ptep >= &bm_pte[0] && ptep < &bm_pte[PAGE_SIZE/sizeof(pte_t)];
864 void __init early_ioremap_init(void)
869 BUILD_BUG_ON((fix_to_virt(0) + PAGE_SIZE) & ((1 << PMD_SHIFT) - 1));
871 WARN_ON((fix_to_virt(0) + PAGE_SIZE) & ((1 << PMD_SHIFT) - 1));
874 early_ioremap_setup();
876 pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
877 memset(bm_pte, 0, sizeof(bm_pte));
878 pmd_populate_kernel(&init_mm, pmd, bm_pte);
881 * The boot-ioremap range spans multiple pmds, for which
882 * we are not prepared:
884 #define __FIXADDR_TOP (-PAGE_SIZE)
885 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
886 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
888 if (pmd != early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))) {
890 printk(KERN_WARNING "pmd %p != %p\n",
891 pmd, early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END)));
892 printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
893 fix_to_virt(FIX_BTMAP_BEGIN));
894 printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END): %08lx\n",
895 fix_to_virt(FIX_BTMAP_END));
897 printk(KERN_WARNING "FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
898 printk(KERN_WARNING "FIX_BTMAP_BEGIN: %d\n",
903 void __init __early_set_fixmap(enum fixed_addresses idx,
904 phys_addr_t phys, pgprot_t flags)
906 unsigned long addr = __fix_to_virt(idx);
909 if (idx >= __end_of_fixed_addresses) {
913 pte = early_ioremap_pte(addr);
915 /* Sanitize 'prot' against any unsupported bits: */
916 pgprot_val(flags) &= __supported_pte_mask;
918 if (pgprot_val(flags))
919 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
921 pte_clear(&init_mm, addr, pte);
922 flush_tlb_one_kernel(addr);