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#define __pa(x)		__phys_addr((unsigned long)(x))
41#define __pa_nodebug(x)	__phys_addr_nodebug((unsigned long)(x))
42/* __pa_symbol should be used for C visible symbols.
43   This seems to be the official gcc blessed way to do such arithmetic. */
44/*
45 * We need __phys_reloc_hide() here because gcc may assume that there is no
46 * overflow during __pa() calculation and can optimize it unexpectedly.
47 * Newer versions of gcc provide -fno-strict-overflow switch to handle this
48 * case properly. Once all supported versions of gcc understand it, we can
49 * remove this Voodoo magic stuff. (i.e. once gcc3.x is deprecated)
50 */
51#define __pa_symbol(x) \
52	__phys_addr_symbol(__phys_reloc_hide((unsigned long)(x)))
53
54#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
55
56#define __boot_va(x)		__va(x)
57#define __boot_pa(x)		__pa(x)
58
59/*
60 * virt_to_page(kaddr) returns a valid pointer if and only if
61 * virt_addr_valid(kaddr) returns true.
62 */
63#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
64#define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
65extern bool __virt_addr_valid(unsigned long kaddr);
66#define virt_addr_valid(kaddr)	__virt_addr_valid((unsigned long) (kaddr))
67
68#endif	/* __ASSEMBLY__ */
69
70#include <asm-generic/memory_model.h>
71#include <asm-generic/getorder.h>
72
73#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
74
75#endif	/* __KERNEL__ */
76#endif /* _ASM_X86_PAGE_H */
77