arch/powerpc/boot/page.h

   1 #ifndef _PPC_BOOT_PAGE_H
   2 #define _PPC_BOOT_PAGE_H
   3 /*
   4  * Copyright (C) 2001 PPC64 Team, IBM Corp
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #ifdef __ASSEMBLY__
  13 #define ASM_CONST(x) x
  14 #else
  15 #define __ASM_CONST(x) x##UL
  16 #define ASM_CONST(x) __ASM_CONST(x)
  17 #endif
  18
  19 /* PAGE_SHIFT determines the page size */
  20 #define PAGE_SHIFT      12
  21 #define PAGE_SIZE       (ASM_CONST(1) << PAGE_SHIFT)
  22 #define PAGE_MASK       (~(PAGE_SIZE-1))
  23
  24 /* align addr on a size boundary - adjust address up/down if needed */
  25 #define _ALIGN_UP(addr, size)   (((addr)+((size)-1))&(~((typeof(addr))(size)-1)))
  26 #define _ALIGN_DOWN(addr, size) ((addr)&(~((typeof(addr))(size)-1)))
  27
  28 /* align addr on a size boundary - adjust address up if needed */
  29 #define _ALIGN(addr,size)     _ALIGN_UP(addr,size)
  30
  31 /* to align the pointer to the (next) page boundary */
  32 #define PAGE_ALIGN(addr)        _ALIGN(addr, PAGE_SIZE)
  33
  34 #endif                          /* _PPC_BOOT_PAGE_H */