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
clear_user_page(void * page,unsigned long vaddr,struct page * pg)25 static inline void clear_user_page(void *page, unsigned long vaddr,
26 struct page *pg)
27 {
28 clear_page(page);
29 }
30
copy_user_page(void * to,void * from,unsigned long vaddr,struct page * topage)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 */
83
