1 /* 2 * linux/include/asm-arm/arch-epxa10/memory.h 3 * 4 * Copyright (C) 2001 Altera Corporation 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_MMU_H 21 #define __ASM_ARCH_MMU_H 22 23 /* 24 * Task size: 3GB 25 */ 26 #define TASK_SIZE (0xc0000000UL) 27 #define TASK_SIZE_26 (0x04000000UL) 28 29 /* 30 * This decides where the kernel will search for a free chunk of vm 31 * space during mmap's. 32 */ 33 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 34 35 /* 36 * Page offset: 3GB 37 */ 38 #define PAGE_OFFSET (0xc0000000UL) 39 #define PHYS_OFFSET (0x00000000UL) 40 41 /* 42 * On epxa10, the dram is contiguous 43 */ 44 #define __virt_to_phys__is_a_macro 45 #define __virt_to_phys(vpage) ((vpage) - PAGE_OFFSET) 46 #define __phys_to_virt__is_a_macro 47 #define __phys_to_virt(ppage) ((ppage) + PAGE_OFFSET) 48 49 /* 50 * Virtual view <-> DMA view memory address translations 51 * virt_to_bus: Used to translate the virtual address to an 52 * address suitable to be passed to set_dma_addr 53 * bus_to_virt: Used to convert an address for DMA operations 54 * to an address that the kernel can use. 55 */ 56 #define __virt_to_bus__is_a_macro 57 #define __virt_to_bus(x) (x - PAGE_OFFSET + /*SDRAM_BASE*/0) 58 #define __bus_to_virt__is_a_macro 59 #define __bus_to_virt(x) (x - /*SDRAM_BASE*/0 + PAGE_OFFSET) 60 61 #endif 62