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  • /*
     * Copyright (C) 1994 - 1999, 2000, 03, 04 Ralf Baechle
     * Copyright (C) 2000, 2002  Maciej W. Rozycki
     * Copyright (C) 1990, 1999, 2000 Silicon Graphics, Inc.
     *
     * SPDX-License-Identifier:	GPL-2.0
     */
    #ifndef _ASM_MACH_GENERIC_SPACES_H
    #define _ASM_MACH_GENERIC_SPACES_H
    
    #include <asm/const.h>
    
    /*
     * This gives the physical RAM offset.
     */
    #ifndef PHYS_OFFSET
    #define PHYS_OFFSET		_AC(0, UL)
    #endif
    
    #ifdef CONFIG_32BIT
    #ifdef CONFIG_KVM_GUEST
    #define CAC_BASE		_AC(0x40000000, UL)
    #else
    #define CAC_BASE		_AC(0x80000000, UL)
    #endif
    #ifndef IO_BASE
    #define IO_BASE			_AC(0xa0000000, UL)
    #endif
    #ifndef UNCAC_BASE
    #define UNCAC_BASE		_AC(0xa0000000, UL)
    #endif
    
    #ifndef MAP_BASE
    #ifdef CONFIG_KVM_GUEST
    #define MAP_BASE		_AC(0x60000000, UL)
    #else
    #define MAP_BASE		_AC(0xc0000000, UL)
    #endif
    #endif
    
    /*
     * Memory above this physical address will be considered highmem.
     */
    #ifndef HIGHMEM_START
    #define HIGHMEM_START		_AC(0x20000000, UL)
    #endif
    
    #endif /* CONFIG_32BIT */
    
    #ifdef CONFIG_64BIT
    
    #ifndef CAC_BASE
    #ifdef CONFIG_DMA_NONCOHERENT
    #define CAC_BASE		_AC(0x9800000000000000, UL)
    #else
    #define CAC_BASE		_AC(0xa800000000000000, UL)
    #endif
    #endif
    
    #ifndef IO_BASE
    #define IO_BASE			_AC(0x9000000000000000, UL)
    #endif
    
    #ifndef UNCAC_BASE
    #define UNCAC_BASE		_AC(0x9000000000000000, UL)
    #endif
    
    #ifndef MAP_BASE
    #define MAP_BASE		_AC(0xc000000000000000, UL)
    #endif
    
    /*
     * Memory above this physical address will be considered highmem.
     * Fixme: 59 bits is a fictive number and makes assumptions about processors
     * in the distant future.  Nobody will care for a few years :-)
     */
    #ifndef HIGHMEM_START
    #define HIGHMEM_START		(_AC(1, UL) << _AC(59, UL))
    #endif
    
    #define TO_PHYS(x)		(	      ((x) & TO_PHYS_MASK))
    #define TO_CAC(x)		(CAC_BASE   | ((x) & TO_PHYS_MASK))
    #define TO_UNCAC(x)		(UNCAC_BASE | ((x) & TO_PHYS_MASK))
    
    #endif /* CONFIG_64BIT */
    
    /*
     * This handles the memory map.
     */
    #ifndef PAGE_OFFSET
    #define PAGE_OFFSET		(CAC_BASE + PHYS_OFFSET)
    #endif
    
    #ifndef FIXADDR_TOP
    #ifdef CONFIG_KVM_GUEST
    #define FIXADDR_TOP		((unsigned long)(long)(int)0x7ffe0000)
    #else
    #define FIXADDR_TOP		((unsigned long)(long)(int)0xfffe0000)
    #endif
    #endif
    
    #endif /* __ASM_MACH_GENERIC_SPACES_H */