root/arch/x86/include/asm/page.h

INCLUDED FROM

DEFINITIONS

1. clear_user_page
2. copy_user_page

   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 
  19 struct page;
  20 
  21 #include <linux/range.h>
  22 extern struct range pfn_mapped[];
  23 extern int nr_pfn_mapped;
  24 
  25 static inline void clear_user_page(void *page, unsigned long vaddr,
  26                                    struct page *pg)
  27 {
  28         clear_page(page);
  29 }
  30 
  31 static 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(movableflags, vma, vaddr) \
  38         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  39 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  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)
  71 extern 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 */