memory.h
来自「嵌入式系统设计与实例开发实验教材二源码 多线程应用程序设计 串行端口程序设计」· C头文件 代码 · 共 56 行
H
56 行
/* * linux/include/asm-arm/arch-arc/memory.h * * Copyright (C) 1996-1999 Russell King. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Changelog: * 22-Nov-1996 RMK Created * 21-Mar-1999 RMK Renamed to memory.h * RMK Moved PAGE_OFFSET and TASK_SIZE here */#ifndef __ASM_ARCH_MEMORY_H#define __ASM_ARCH_MEMORY_H/* * User space: 26MB */#define TASK_SIZE (0x01a00000UL)#define TASK_SIZE_26 (0x01a00000UL)/* * 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: 32MB */#define PAGE_OFFSET (0x02000000UL)#define PHYS_OFFSET (0x02000000UL)#define __virt_to_phys__is_a_macro#define __virt_to_phys(vpage) vpage#define __phys_to_virt__is_a_macro#define __phys_to_virt(ppage) ppage/* * 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)#define __bus_to_virt__is_a_macro#define __bus_to_virt(x) (x)#define PHYS_TO_NID(addr) (0)#endif
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