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 __ASSEMBLER__
 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 /* __ASSEMBLER__ */
 31
 32#ifdef CONFIG_32BIT
 33#define CAC_BASE		_AC(0x80000000, UL)
 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#define MAP_BASE		_AC(0xc0000000, UL)
 43#endif
 44
 45/*
 46 * Memory above this physical address will be considered highmem.
 47 */
 48#ifndef HIGHMEM_START
 49#define HIGHMEM_START		_AC(0x20000000, UL)
 50#endif
 51
 52#define CKSEG0ADDR_OR_64BIT(x)	CKSEG0ADDR(x)
 53#define CKSEG1ADDR_OR_64BIT(x)	CKSEG1ADDR(x)
 54#endif /* CONFIG_32BIT */
 55
 56#ifdef CONFIG_64BIT
 57
 58#ifndef CAC_BASE
 59#define CAC_BASE	PHYS_TO_XKPHYS(read_c0_config() & CONF_CM_CMASK, 0)
 60#endif
 61
 62#ifndef IO_BASE
 63#define IO_BASE			_AC(0x9000000000000000, UL)
 64#endif
 65
 66#ifndef UNCAC_BASE
 67#define UNCAC_BASE		_AC(0x9000000000000000, UL)
 68#endif
 69
 70#ifndef MAP_BASE
 71#define MAP_BASE		_AC(0xc000000000000000, UL)
 72#endif
 73
 74/*
 75 * Memory above this physical address will be considered highmem.
 76 * Fixme: 59 bits is a fictive number and makes assumptions about processors
 77 * in the distant future.  Nobody will care for a few years :-)
 78 */
 79#ifndef HIGHMEM_START
 80#define HIGHMEM_START		(_AC(1, UL) << _AC(59, UL))
 81#endif
 82
 83#define TO_PHYS(x)		(	      ((x) & TO_PHYS_MASK))
 84#define TO_CAC(x)		(CAC_BASE   | ((x) & TO_PHYS_MASK))
 85#define TO_UNCAC(x)		(UNCAC_BASE | ((x) & TO_PHYS_MASK))
 86
 87#define CKSEG0ADDR_OR_64BIT(x)	TO_CAC(x)
 88#define CKSEG1ADDR_OR_64BIT(x)	TO_UNCAC(x)
 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#define FIXADDR_TOP		((unsigned long)(long)(int)0xfffe0000)
100#endif
101
102#endif /* __ASM_MACH_GENERIC_SPACES_H */