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
20static inline void clear_user_page(void *page, unsigned long vaddr,
21				   struct page *pg)
22{
23	clear_page(page);
24}
25
26static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
27				  struct page *topage)
28{
29	copy_page(to, from);
30}
31
32#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
33	alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
34#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
35
36#define __pa(x)		__phys_addr((unsigned long)(x))
37#define __pa_nodebug(x)	__phys_addr_nodebug((unsigned long)(x))
38/* __pa_symbol should be used for C visible symbols.
39   This seems to be the official gcc blessed way to do such arithmetic. */
40/*
41 * We need __phys_reloc_hide() here because gcc may assume that there is no
42 * overflow during __pa() calculation and can optimize it unexpectedly.
43 * Newer versions of gcc provide -fno-strict-overflow switch to handle this
44 * case properly. Once all supported versions of gcc understand it, we can
45 * remove this Voodoo magic stuff. (i.e. once gcc3.x is deprecated)
46 */
47#define __pa_symbol(x)	__pa(__phys_reloc_hide((unsigned long)(x)))
48
49#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
50
51#define __boot_va(x)		__va(x)
52#define __boot_pa(x)		__pa(x)
53
54/*
55 * virt_to_page(kaddr) returns a valid pointer if and only if
56 * virt_addr_valid(kaddr) returns true.
57 */
58#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
59#define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
60extern bool __virt_addr_valid(unsigned long kaddr);
61#define virt_addr_valid(kaddr)	__virt_addr_valid((unsigned long) (kaddr))
62
63#endif	/* __ASSEMBLY__ */
64
65#include <asm-generic/memory_model.h>
66#include <asm-generic/getorder.h>
67
68#define __HAVE_ARCH_GATE_AREA 1
69
70#endif	/* __KERNEL__ */
71#endif /* _ASM_X86_PAGE_H */