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 #include <asm/mipsregs.h>
  16
  17 #ifndef IO_SPACE_LIMIT
  18 #define IO_SPACE_LIMIT 0xffff
  19 #endif
  20
  21 /*
  22  * This gives the physical RAM offset.
  23  */
  24 #ifndef __ASSEMBLY__
  25 # if defined(CONFIG_MIPS_AUTO_PFN_OFFSET)
  26 #  define PHYS_OFFSET           ((unsigned long)PFN_PHYS(ARCH_PFN_OFFSET))
  27 # elif !defined(PHYS_OFFSET)
  28 #  define PHYS_OFFSET           _AC(0, UL)
  29 # endif
  30 #endif /* __ASSEMBLY__ */
  31
  32 #ifdef CONFIG_32BIT
  33 #ifdef CONFIG_KVM_GUEST
  34 #define CAC_BASE                _AC(0x40000000, UL)
  35 #else
  36 #define CAC_BASE                _AC(0x80000000, UL)
  37 #endif
  38 #ifndef IO_BASE
  39 #define IO_BASE                 _AC(0xa0000000, UL)
  40 #endif
  41 #ifndef UNCAC_BASE
  42 #define UNCAC_BASE              _AC(0xa0000000, UL)
  43 #endif
  44
  45 #ifndef MAP_BASE
  46 #ifdef CONFIG_KVM_GUEST
  47 #define MAP_BASE                _AC(0x60000000, UL)
  48 #else
  49 #define MAP_BASE                _AC(0xc0000000, UL)
  50 #endif
  51 #endif
  52
  53 /*
  54  * Memory above this physical address will be considered highmem.
  55  */
  56 #ifndef HIGHMEM_START
  57 #define HIGHMEM_START           _AC(0x20000000, UL)
  58 #endif
  59
  60 #endif /* CONFIG_32BIT */
  61
  62 #ifdef CONFIG_64BIT
  63
  64 #ifndef CAC_BASE
  65 #define CAC_BASE        PHYS_TO_XKPHYS(read_c0_config() & CONF_CM_CMASK, 0)
  66 #endif
  67
  68 #ifndef IO_BASE
  69 #define IO_BASE                 _AC(0x9000000000000000, UL)
  70 #endif
  71
  72 #ifndef UNCAC_BASE
  73 #define UNCAC_BASE              _AC(0x9000000000000000, UL)
  74 #endif
  75
  76 #ifndef MAP_BASE
  77 #define MAP_BASE                _AC(0xc000000000000000, UL)
  78 #endif
  79
  80 /*
  81  * Memory above this physical address will be considered highmem.
  82  * Fixme: 59 bits is a fictive number and makes assumptions about processors
  83  * in the distant future.  Nobody will care for a few years :-)
  84  */
  85 #ifndef HIGHMEM_START
  86 #define HIGHMEM_START           (_AC(1, UL) << _AC(59, UL))
  87 #endif
  88
  89 #define TO_PHYS(x)              (             ((x) & TO_PHYS_MASK))
  90 #define TO_CAC(x)               (CAC_BASE   | ((x) & TO_PHYS_MASK))
  91 #define TO_UNCAC(x)             (UNCAC_BASE | ((x) & TO_PHYS_MASK))
  92
  93 #endif /* CONFIG_64BIT */
  94
  95 /*
  96  * This handles the memory map.
  97  */
  98 #ifndef PAGE_OFFSET
  99 #define PAGE_OFFSET             (CAC_BASE + PHYS_OFFSET)
 100 #endif
 101
 102 #ifndef FIXADDR_TOP
 103 #ifdef CONFIG_KVM_GUEST
 104 #define FIXADDR_TOP             ((unsigned long)(long)(int)0x7ffe0000)
 105 #else
 106 #define FIXADDR_TOP             ((unsigned long)(long)(int)0xfffe0000)
 107 #endif
 108 #endif
 109
 110 #endif /* __ASM_MACH_GENERIC_SPACES_H */