1 /* 2 * linux/include/asm-arm/arch-mx1ads/memory.h 3 * 4 * Copyright (C) 1999 ARM Limited 5 * Copyright (C) 2002 Shane Nay (shane@minirl.com) 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 #ifndef __ASM_ARCH_MMU_H 22 #define __ASM_ARCH_MMU_H 23 24 /* 25 * Task size: 3GB 26 */ 27 #define TASK_SIZE (0xc0000000UL) 28 #define TASK_SIZE_26 (0x04000000UL) 29 30 /* 31 * This decides where the kernel will search for a free chunk of vm 32 * space during mmap's. 33 */ 34 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 35 36 /* 37 * Page offset: 3GB 38 */ 39 /* Note 40 * This should be hot-swapable with a CONFIG_MX1ADS_SDRAM 41 * or something similar, so we can swap between SRAM and 42 * SDRAM running kernel. 43 */ 44 45 #ifdef CONFIG_ARCH_MX1ADS_SRAM 46 #define PAGE_OFFSET (0xc0000000UL) 47 #define PHYS_OFFSET (0x12000000UL) 48 #else 49 #define PAGE_OFFSET (0xc0000000UL) 50 #define PHYS_OFFSET (0x08000000UL) 51 #endif 52 53 /* 54 * On mx1, the sdram/sram is contiguous 55 */ 56 #define __virt_to_phys__is_a_macro 57 #define __virt_to_phys(vpage) ((vpage) - PAGE_OFFSET + PHYS_OFFSET) 58 #define __phys_to_virt__is_a_macro 59 #define __phys_to_virt(ppage) ((ppage) + PAGE_OFFSET - PHYS_OFFSET) 60 61 /* 62 * Virtual view <-> DMA view memory address translations 63 * virt_to_bus: Used to translate the virtual address to an 64 * address suitable to be passed to set_dma_addr 65 * bus_to_virt: Used to convert an address for DMA operations 66 * to an address that the kernel can use. 67 */ 68 #define __virt_to_bus__is_a_macro 69 #define __virt_to_bus(x) (x - PAGE_OFFSET + PHYS_OFFSET) 70 #define __bus_to_virt__is_a_macro 71 #define __bus_to_virt(x) (x - PHYS_OFFSET + PAGE_OFFSET) 72 73 #endif 74