memory.h

广州斯道2410普及版II的源代码

/*
 *  linux/include/asm-arm/arch-ebsa285/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.
 *   17-May-1998 DAG	Added __virt_to_bus and __bus_to_virt functions.
 *   21-Nov-1998 RMK	Changed __virt_to_bus and __bus_to_virt to macros.
 *   21-Mar-1999 RMK	Added PAGE_OFFSET for co285 architecture.
 *			Renamed to memory.h
 *			Moved PAGE_OFFSET and TASK_SIZE here
 */
#ifndef __ASM_ARCH_MMU_H
#define __ASM_ARCH_MMU_H

#include <linux/config.h>

#if defined(CONFIG_FOOTBRIDGE_ADDIN)
/*
 * If we may be using add-in footbridge mode, then we must
 * use the out-of-line translation that makes use of the
 * PCI BAR
 */
#ifndef __ASSEMBLY__
extern unsigned long __virt_to_bus(unsigned long);
extern unsigned long __bus_to_virt(unsigned long);
#endif

#elif defined(CONFIG_FOOTBRIDGE_HOST)

#define __virt_to_bus__is_a_macro
#define __virt_to_bus(x)	((x) - 0xe0000000)
#define __bus_to_virt__is_a_macro
#define __bus_to_virt(x)	((x) + 0xe0000000)

#else

#error "Undefined footbridge mode"

#endif

#if defined(CONFIG_ARCH_FOOTBRIDGE)

/* Task size and page offset at 3GB */
#define TASK_SIZE		(0xc0000000UL)
#define PAGE_OFFSET		(0xc0000000UL)

#elif defined(CONFIG_ARCH_CO285)

/* Task size and page offset at 1.5GB */
#define TASK_SIZE		(0x60000000UL)
#define PAGE_OFFSET		(0x60000000UL)

#else

#error "Undefined footbridge architecture"

#endif

#define TASK_SIZE_26		(0x04000000UL)
#define PHYS_OFFSET		(0x00000000UL)

/*
 * This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)

/*
 * The DRAM is always contiguous.
 */
#define __virt_to_phys__is_a_macro
#define __virt_to_phys(vpage) ((unsigned long)(vpage) - PAGE_OFFSET)
#define __phys_to_virt__is_a_macro
#define __phys_to_virt(ppage) ((unsigned long)(ppage) + PAGE_OFFSET)

#define PHYS_TO_NID(addr)	(0)

#endif