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

   1/*
   2 * Copyright (C) 1998 Ingo Molnar
   3 * Copyright 2010 Tilera Corporation. All Rights Reserved.
   4 *
   5 *   This program is free software; you can redistribute it and/or
   6 *   modify it under the terms of the GNU General Public License
   7 *   as published by the Free Software Foundation, version 2.
   8 *
   9 *   This program is distributed in the hope that it will be useful, but
  10 *   WITHOUT ANY WARRANTY; without even the implied warranty of
  11 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  12 *   NON INFRINGEMENT.  See the GNU General Public License for
  13 *   more details.
  14 */
  15
  16#ifndef _ASM_TILE_FIXMAP_H
  17#define _ASM_TILE_FIXMAP_H
  18
  19#include <asm/page.h>
  20
  21#ifndef __ASSEMBLY__
  22#include <linux/kernel.h>
  23#ifdef CONFIG_HIGHMEM
  24#include <linux/threads.h>
  25#include <asm/kmap_types.h>
  26#endif
  27
  28/*
  29 * Here we define all the compile-time 'special' virtual
  30 * addresses. The point is to have a constant address at
  31 * compile time, but to set the physical address only
  32 * in the boot process. We allocate these special addresses
  33 * from the end of supervisor virtual memory backwards.
  34 * Also this lets us do fail-safe vmalloc(), we
  35 * can guarantee that these special addresses and
  36 * vmalloc()-ed addresses never overlap.
  37 *
  38 * these 'compile-time allocated' memory buffers are
  39 * fixed-size 4k pages. (or larger if used with an increment
  40 * higher than 1) use fixmap_set(idx,phys) to associate
  41 * physical memory with fixmap indices.
  42 *
  43 * TLB entries of such buffers will not be flushed across
  44 * task switches.
  45 */
  46enum fixed_addresses {
  47#ifdef __tilegx__
  48        /*
  49         * TILEPro has unmapped memory above so the hole isn't needed,
  50         * and in any case the hole pushes us over a single 16MB pmd.
  51         */
  52        FIX_HOLE,
  53#endif
  54#ifdef CONFIG_HIGHMEM
  55        FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
  56        FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
  57#endif
  58#ifdef __tilegx__  /* see homecache.c */
  59        FIX_HOMECACHE_BEGIN,
  60        FIX_HOMECACHE_END = FIX_HOMECACHE_BEGIN+(NR_CPUS)-1,
  61#endif
  62        __end_of_permanent_fixed_addresses,
  63
  64        /*
  65         * Temporary boot-time mappings, used before ioremap() is functional.
  66         * Not currently needed by the Tile architecture.
  67         */
  68#define NR_FIX_BTMAPS   0
  69#if NR_FIX_BTMAPS
  70        FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
  71        FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS - 1,
  72        __end_of_fixed_addresses
  73#else
  74        __end_of_fixed_addresses = __end_of_permanent_fixed_addresses
  75#endif
  76};
  77
  78#define __FIXADDR_SIZE  (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
  79#define __FIXADDR_BOOT_SIZE     (__end_of_fixed_addresses << PAGE_SHIFT)
  80#define FIXADDR_START           (FIXADDR_TOP + PAGE_SIZE - __FIXADDR_SIZE)
  81#define FIXADDR_BOOT_START      (FIXADDR_TOP + PAGE_SIZE - __FIXADDR_BOOT_SIZE)
  82
  83#include <asm-generic/fixmap.h>
  84
  85#endif /* !__ASSEMBLY__ */
  86
  87#endif /* _ASM_TILE_FIXMAP_H */
  88