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

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  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_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)
 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 */
 83 

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