arch/mips/include/asm/mach-generic/spaces.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1994 - 1999, 2000, 03, 04 Ralf Baechle
   7  * Copyright (C) 2000, 2002  Maciej W. Rozycki
   8  * Copyright (C) 1990, 1999, 2000 Silicon Graphics, Inc.
   9  */
  10 #ifndef _ASM_MACH_GENERIC_SPACES_H
  11 #define _ASM_MACH_GENERIC_SPACES_H
  12
  13 #include <linux/const.h>
  14
  15 /*
  16  * This gives the physical RAM offset.
  17  */
  18 #ifndef PHYS_OFFSET
  19 #define PHYS_OFFSET             _AC(0, UL)
  20 #endif
  21
  22 #ifdef CONFIG_32BIT
  23
  24 #define CAC_BASE                _AC(0x80000000, UL)
  25 #define IO_BASE                 _AC(0xa0000000, UL)
  26 #define UNCAC_BASE              _AC(0xa0000000, UL)
  27
  28 #ifndef MAP_BASE
  29 #define MAP_BASE                _AC(0xc0000000, UL)
  30 #endif
  31
  32 /*
  33  * Memory above this physical address will be considered highmem.
  34  */
  35 #ifndef HIGHMEM_START
  36 #define HIGHMEM_START           _AC(0x20000000, UL)
  37 #endif
  38
  39 #endif /* CONFIG_32BIT */
  40
  41 #ifdef CONFIG_64BIT
  42
  43 #ifndef CAC_BASE
  44 #ifdef CONFIG_DMA_NONCOHERENT
  45 #define CAC_BASE                _AC(0x9800000000000000, UL)
  46 #else
  47 #define CAC_BASE                _AC(0xa800000000000000, UL)
  48 #endif
  49 #endif
  50
  51 #ifndef IO_BASE
  52 #define IO_BASE                 _AC(0x9000000000000000, UL)
  53 #endif
  54
  55 #ifndef UNCAC_BASE
  56 #define UNCAC_BASE              _AC(0x9000000000000000, UL)
  57 #endif
  58
  59 #ifndef MAP_BASE
  60 #define MAP_BASE                _AC(0xc000000000000000, UL)
  61 #endif
  62
  63 /*
  64  * Memory above this physical address will be considered highmem.
  65  * Fixme: 59 bits is a fictive number and makes assumptions about processors
  66  * in the distant future.  Nobody will care for a few years :-)
  67  */
  68 #ifndef HIGHMEM_START
  69 #define HIGHMEM_START           (_AC(1, UL) << _AC(59, UL))
  70 #endif
  71
  72 #define TO_PHYS(x)              (             ((x) & TO_PHYS_MASK))
  73 #define TO_CAC(x)               (CAC_BASE   | ((x) & TO_PHYS_MASK))
  74 #define TO_UNCAC(x)             (UNCAC_BASE | ((x) & TO_PHYS_MASK))
  75
  76 #endif /* CONFIG_64BIT */
  77
  78 /*
  79  * This handles the memory map.
  80  */
  81 #ifndef PAGE_OFFSET
  82 #define PAGE_OFFSET             (CAC_BASE + PHYS_OFFSET)
  83 #endif
  84
  85 #ifndef FIXADDR_TOP
  86 #define FIXADDR_TOP             ((unsigned long)(long)(int)0xfffe0000)
  87 #endif
  88
  89 #endif /* __ASM_MACH_GENERIC_SPACES_H */