mmu.h

arm平台上的uclinux系统全部源代码

/*
 * linux/include/asm-arm/arch-ebsa/mmu.h
 *
 * Copyright (c) 1996 Russell King.
 *
 * Changelog:
 *  20-10-1996	RMK	Created
 */
#ifndef __ASM_ARCH_MMU_H
#define __ASM_ARCH_MMU_H

/*
 * On ebsa, the dram is contiguous
 */
#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)

/*
 * 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)

#endif