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