/*
 * linux/include/asm-arm/arch-nds/memory.h
 *
 *  Copyright (C) 2004 Tobias Lorenz
 *
 * 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.
 */

#ifndef __ASM_ARCH_MEMORY_H
#define __ASM_ARCH_MEMORY_H

#include <linux/config.h>

#define TASK_SIZE	(0x01a00000UL)
#define TASK_SIZE_26	TASK_SIZE

#define __virt_to_phys(vpage) ((unsigned long) (vpage))
#define __phys_to_virt(ppage) ((unsigned long) (ppage))
#define __virt_to_bus(vpage) ((unsigned long) (vpage))
#define __bus_to_virt(ppage) ((unsigned long) (ppage))

#ifdef CONFIG_DISCONTIGMEM

/*
 * 	node 0:  0x02000000 - 0x023fffff
 * 	node 1:  0x08000000 - 0x09ffffff
 */
#define NODE_MAX_MEM_SHIFT	26
#define NODE_MAX_MEM_SIZE	(1<<NODE_MAX_MEM_SHIFT)

/*
 * Given a kernel address, find the home node of the underlying memory.
 */
#define KVADDR_TO_NID(addr) \
		(((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MAX_MEM_SHIFT)

/*
 * Given a page frame number, convert it to a node id.
 */
#define PFN_TO_NID(pfn) \
	(((pfn) - PHYS_PFN_OFFSET) >> (NODE_MAX_MEM_SHIFT - PAGE_SHIFT))

/*
 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
 * and returns the mem_map of that node.
 */
#define ADDR_TO_MAPBASE(kaddr) \
			NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr)))

#define PFN_TO_MAPBASE(pfn)	NODE_MEM_MAP(PFN_TO_NID(pfn))

/*
 * Given a kaddr, LOCAL_MAP_NR finds the owning node of the memory
 * and returns the index corresponding to the appropriate page in the
 * node's mem_map.
 */
#define LOCAL_MAP_NR(addr) \
	(((unsigned long)(addr) & (NODE_MAX_MEM_SIZE - 1)) >> PAGE_SHIFT)

#endif /* CONFIG_DISCONTIGMEM */

#endif /*  __ASM_ARCH_MEMORY_H */