include/asm-x86/page_32.h

   1 #ifndef _I386_PAGE_H
   2 #define _I386_PAGE_H
   3
   4 #ifdef __KERNEL__
   5 #ifndef __ASSEMBLY__
   6
   7 /*
   8  * These are used to make use of C type-checking..
   9  */
  10 extern int nx_enabled;
  11
  12 #endif /* !__ASSEMBLY__ */
  13
  14 #ifndef __ASSEMBLY__
  15
  16 struct vm_area_struct;
  17
  18 /*
  19  * This much address space is reserved for vmalloc() and iomap()
  20  * as well as fixmap mappings.
  21  */
  22 extern unsigned int __VMALLOC_RESERVE;
  23
  24 extern int sysctl_legacy_va_layout;
  25
  26 extern int page_is_ram(unsigned long pagenr);
  27
  28 #endif /* __ASSEMBLY__ */
  29
  30 #define VMALLOC_RESERVE         ((unsigned long)__VMALLOC_RESERVE)
  31 #define MAXMEM                  (-__PAGE_OFFSET-__VMALLOC_RESERVE)
  32 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
  33 /* __pa_symbol should be used for C visible symbols.
  34    This seems to be the official gcc blessed way to do such arithmetic. */
  35 #define __pa_symbol(x)          __pa(RELOC_HIDE((unsigned long)(x),0))
  36 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
  37 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
  38 #ifdef CONFIG_FLATMEM
  39 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
  40 #endif /* CONFIG_FLATMEM */
  41 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  42
  43 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  44
  45 #include <asm-generic/memory_model.h>
  46 #include <asm-generic/page.h>
  47
  48 #define __HAVE_ARCH_GATE_AREA 1
  49 #endif /* __KERNEL__ */
  50
  51 #endif /* _I386_PAGE_H */