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