LXR linux/arch/x86/include/asm/page.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_PAGE_H
   3#define _ASM_X86_PAGE_H
   4
   5#include <linux/types.h>
   6
   7#ifdef __KERNEL__
   8
   9#include <asm/page_types.h>
  10
  11#ifdef CONFIG_X86_64
  12#include <asm/page_64.h>
  13#else
  14#include <asm/page_32.h>
  15#endif  /* CONFIG_X86_64 */
  16
  17#ifndef __ASSEMBLY__
  18
  19struct page;
  20
  21#include <linux/range.h>
  22extern struct range pfn_mapped[];
  23extern int nr_pfn_mapped;
  24
  25static inline void clear_user_page(void *page, unsigned long vaddr,
  26                                   struct page *pg)
  27{
  28        clear_page(page);
  29}
  30
  31static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
  32                                  struct page *topage)
  33{
  34        copy_page(to, from);
  35}
  36
  37#define alloc_zeroed_user_highpage_movable(vma, vaddr) \
  38        alloc_page_vma(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, vma, vaddr)
  39#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE_MOVABLE
  40
  41#ifndef __pa
  42#define __pa(x)         __phys_addr((unsigned long)(x))
  43#endif
  44
  45#define __pa_nodebug(x) __phys_addr_nodebug((unsigned long)(x))
  46/* __pa_symbol should be used for C visible symbols.
  47   This seems to be the official gcc blessed way to do such arithmetic. */
  48/*
  49 * We need __phys_reloc_hide() here because gcc may assume that there is no
  50 * overflow during __pa() calculation and can optimize it unexpectedly.
  51 * Newer versions of gcc provide -fno-strict-overflow switch to handle this
  52 * case properly. Once all supported versions of gcc understand it, we can
  53 * remove this Voodoo magic stuff. (i.e. once gcc3.x is deprecated)
  54 */
  55#define __pa_symbol(x) \
  56        __phys_addr_symbol(__phys_reloc_hide((unsigned long)(x)))
  57
  58#ifndef __va
  59#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
  60#endif
  61
  62#define __boot_va(x)            __va(x)
  63#define __boot_pa(x)            __pa(x)
  64
  65/*
  66 * virt_to_page(kaddr) returns a valid pointer if and only if
  67 * virt_addr_valid(kaddr) returns true.
  68 */
  69#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  70#define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
  71extern bool __virt_addr_valid(unsigned long kaddr);
  72#define virt_addr_valid(kaddr)  __virt_addr_valid((unsigned long) (kaddr))
  73
  74#endif  /* __ASSEMBLY__ */
  75
  76#include <asm-generic/memory_model.h>
  77#include <asm-generic/getorder.h>
  78
  79#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  80
  81#endif  /* __KERNEL__ */
  82#endif /* _ASM_X86_PAGE_H */
  83