LXR linux/arch/xtensa/include/asm/fixmap.h

   1/*
   2 * fixmap.h: compile-time virtual memory allocation
   3 *
   4 * This file is subject to the terms and conditions of the GNU General Public
   5 * License.  See the file "COPYING" in the main directory of this archive
   6 * for more details.
   7 *
   8 * Copyright (C) 1998 Ingo Molnar
   9 *
  10 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
  11 */
  12
  13#ifndef _ASM_FIXMAP_H
  14#define _ASM_FIXMAP_H
  15
  16#ifdef CONFIG_HIGHMEM
  17#include <linux/threads.h>
  18#include <linux/pgtable.h>
  19#include <asm/kmap_size.h>
  20
  21/* The map slots for temporary mappings via kmap_atomic/local(). */
  22enum fixed_addresses {
  23        FIX_KMAP_BEGIN,
  24        FIX_KMAP_END = FIX_KMAP_BEGIN +
  25                (KM_MAX_IDX * NR_CPUS * DCACHE_N_COLORS) - 1,
  26        __end_of_fixed_addresses
  27};
  28
  29#define FIXADDR_END     (XCHAL_KSEG_CACHED_VADDR - PAGE_SIZE)
  30#define FIXADDR_SIZE    (__end_of_fixed_addresses << PAGE_SHIFT)
  31/* Enforce that FIXADDR_START is PMD aligned to handle cache aliasing */
  32#define FIXADDR_START   ((FIXADDR_END - FIXADDR_SIZE) & PMD_MASK)
  33#define FIXADDR_TOP     (FIXADDR_START + FIXADDR_SIZE - PAGE_SIZE)
  34
  35#include <asm-generic/fixmap.h>
  36
  37#endif /* CONFIG_HIGHMEM */
  38#endif
  39