arch/x86/include/asm/page.h

   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
  18 struct page;
  19
  20 static inline void clear_user_page(void *page, unsigned long vaddr,
  21                                    struct page *pg)
  22 {
  23         clear_page(page);
  24 }
  25
  26 static 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)
  60 extern 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 */