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 54 行

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/* *  linux/include/asm-arm/arch-ebsa110/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: *   20-Oct-1996 RMK	Created *   31-Dec-1997 RMK	Fixed definitions to reduce warnings *   21-Mar-1999 RMK	Renamed to memory.h *		 RMK	Moved TASK_SIZE and PAGE_OFFSET here */#ifndef __ASM_ARCH_MEMORY_H#define __ASM_ARCH_MEMORY_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 */#define PAGE_OFFSET	(0xc0000000UL)#define PHYS_OFFSET	(0x00000000UL)#define __virt_to_phys__is_a_macro#define __virt_to_phys(vpage)	((vpage) - PAGE_OFFSET)#define __phys_to_virt__is_a_macro#define __phys_to_virt(ppage)	((ppage) + PAGE_OFFSET)/* * We keep this 1:1 so that we don't interfere * with the PCMCIA memory regions */#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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