1 /* 2 * arch/arm/mach-realview/include/mach/memory.h 3 * 4 * Copyright (C) 2003 ARM Limited 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20 #ifndef __ASM_ARCH_MEMORY_H 21 #define __ASM_ARCH_MEMORY_H 22 23 /* 24 * Physical DRAM offset. 25 */ 26 #ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET 27 #define PLAT_PHYS_OFFSET UL(0x70000000) 28 #else 29 #define PLAT_PHYS_OFFSET UL(0x00000000) 30 #endif 31 32 #ifdef CONFIG_SPARSEMEM 33 34 /* 35 * Sparsemem definitions for RealView PBX. 36 * 37 * The RealView PBX board has another block of 512MB of RAM at 0x20000000, 38 * however only the block at 0x70000000 (or the 256MB mirror at 0x00000000) 39 * may be used for DMA. 40 * 41 * The macros below define a section size of 256MB and a non-linear virtual to 42 * physical mapping: 43 * 44 * 256MB @ 0x00000000 -> PAGE_OFFSET 45 * 512MB @ 0x20000000 -> PAGE_OFFSET + 0x10000000 46 * 256MB @ 0x80000000 -> PAGE_OFFSET + 0x30000000 47 */ 48 #ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET 49 #error "SPARSEMEM not available with REALVIEW_HIGH_PHYS_OFFSET" 50 #endif 51 52 #define MAX_PHYSMEM_BITS 32 53 #define SECTION_SIZE_BITS 28 54 55 /* bank page offsets */ 56 #define PAGE_OFFSET1 (PAGE_OFFSET + 0x10000000) 57 #define PAGE_OFFSET2 (PAGE_OFFSET + 0x30000000) 58 59 #define __phys_to_virt(phys) \ 60 ((phys) >= 0x80000000 ? (phys) - 0x80000000 + PAGE_OFFSET2 : \ 61 (phys) >= 0x20000000 ? (phys) - 0x20000000 + PAGE_OFFSET1 : \ 62 (phys) + PAGE_OFFSET) 63 64 #define __virt_to_phys(virt) \ 65 ((virt) >= PAGE_OFFSET2 ? (virt) - PAGE_OFFSET2 + 0x80000000 : \ 66 (virt) >= PAGE_OFFSET1 ? (virt) - PAGE_OFFSET1 + 0x20000000 : \ 67 (virt) - PAGE_OFFSET) 68 69 #endif /* CONFIG_SPARSEMEM */ 70 71 #endif 72