memory.h
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上传日期:2013-02-24
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- /*
- * linux/include/asm-arm/arch-mx1ads/memory.h
- *
- * Copyright (C) 1999 ARM Limited
- * Copyright (C) 2002 Shane Nay (shane@minirl.com)
- *
- * 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_MMU_H
- #define __ASM_ARCH_MMU_H
- /*
- * Task size: 3GB
- */
- #define TASK_SIZE (0xc0000000UL)
- #define TASK_SIZE_26 (0x04000000UL)
- /*
- * This decides where the kernel will search for a free chunk of vm
- * space during mmap's.
- */
- #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
- /*
- * Page offset: 3GB
- */
- /* Note
- * This should be hot-swapable with a CONFIG_MX1ADS_SDRAM
- * or something similar, so we can swap between SRAM and
- * SDRAM running kernel.
- */
- #ifdef CONFIG_ARCH_MX1ADS_SRAM
- #define PAGE_OFFSET (0xc0000000UL)
- #define PHYS_OFFSET (0x12000000UL)
- #else
- #define PAGE_OFFSET (0xc0000000UL)
- #define PHYS_OFFSET (0x08000000UL)
- #endif
- /*
- * On mx1, the sdram/sram is contiguous
- */
- #define __virt_to_phys__is_a_macro
- #define __virt_to_phys(vpage) ((vpage) - PAGE_OFFSET + PHYS_OFFSET)
- #define __phys_to_virt__is_a_macro
- #define __phys_to_virt(ppage) ((ppage) + PAGE_OFFSET - PHYS_OFFSET)
- /*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- * address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- * to an address that the kernel can use.
- */
- #define __virt_to_bus__is_a_macro
- #define __virt_to_bus(x) (x - PAGE_OFFSET + PHYS_OFFSET)
- #define __bus_to_virt__is_a_macro
- #define __bus_to_virt(x) (x - PHYS_OFFSET + PAGE_OFFSET)
- #define PHYS_TO_NID(addr) (0)
- #endif