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/* * arch/arm/mach-realview/include/mach/memory.h * * Copyright (C) 2003 ARM Limited * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef __ASM_ARCH_MEMORY_H #define __ASM_ARCH_MEMORY_H #ifdef CONFIG_SPARSEMEM /* * Sparsemem definitions for RealView PBX. * * The RealView PBX board has another block of 512MB of RAM at 0x20000000, * however only the block at 0x70000000 (or the 256MB mirror at 0x00000000) * may be used for DMA. * * The macros below define a section size of 256MB and a non-linear virtual to * physical mapping: * * 256MB @ 0x00000000 -> PAGE_OFFSET * 512MB @ 0x20000000 -> PAGE_OFFSET + 0x10000000 * 256MB @ 0x80000000 -> PAGE_OFFSET + 0x30000000 */ #ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET #error "SPARSEMEM not available with REALVIEW_HIGH_PHYS_OFFSET" #endif #define MAX_PHYSMEM_BITS 32 #define SECTION_SIZE_BITS 28 /* bank page offsets */ #define PAGE_OFFSET1 (PAGE_OFFSET + 0x10000000) #define PAGE_OFFSET2 (PAGE_OFFSET + 0x30000000) #define PHYS_OFFSET PLAT_PHYS_OFFSET #define __phys_to_virt(phys) \ ((phys) >= 0x80000000 ? (phys) - 0x80000000 + PAGE_OFFSET2 : \ (phys) >= 0x20000000 ? (phys) - 0x20000000 + PAGE_OFFSET1 : \ (phys) + PAGE_OFFSET) #define __virt_to_phys(virt) \ ((virt) >= PAGE_OFFSET2 ? (virt) - PAGE_OFFSET2 + 0x80000000 : \ (virt) >= PAGE_OFFSET1 ? (virt) - PAGE_OFFSET1 + 0x20000000 : \ (virt) - PAGE_OFFSET) #endif /* CONFIG_SPARSEMEM */ #endif