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 #endif /* __ASM_MACH_GENERIC_SPACES_H */ 86