memory.h

来自「内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系」· C头文件 代码 · 共 47 行

/*
 * linux/include/asm-arm/arch-tbox/memory.h
 *
 * Copyright (c) 1996-1999 Russell King.
 * Copyright (c) 1998-1999 Phil Blundell
 */
#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		(0x80000000UL)

/*
 * DRAM is contiguous
 */
#define __virt_to_phys(vpage) ((vpage) - PAGE_OFFSET + PHYS_OFFSET)
#define __phys_to_virt(ppage) ((ppage) + PAGE_OFFSET - PHYS_OFFSET)
#define __virt_to_phys__is_a_macro
#define __phys_to_virt__is_a_macro

/*
 * Bus view is the same as physical view
 */
#define __virt_to_bus__is_a_macro
#define __virt_to_bus(x)	__virt_to_phys(x)
#define __bus_to_virt__is_a_macro
#define __bus_to_virt(x)	__phys_to_virt(x)

#define PHYS_TO_NID(addr)	(0)

#endif