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/*
 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 */

#ifndef _ASM_TILE_MMZONE_H
#define _ASM_TILE_MMZONE_H

extern struct pglist_data node_data[];
#define NODE_DATA(nid)	(&node_data[nid])

extern void get_memcfg_numa(void);

#ifdef CONFIG_DISCONTIGMEM

#include <asm/page.h>

/*
 * Generally, memory ranges are always doled out by the hypervisor in
 * fixed-size, power-of-two increments.  That would make computing the node
 * very easy.  We could just take a couple high bits of the PA, which
 * denote the memory shim, and we'd be done.  However, when we're doing
 * memory striping, this may not be true; PAs with different high bit
 * values might be in the same node.  Thus, we keep a lookup table to
 * translate the high bits of the PFN to the node number.
 */
extern int highbits_to_node[];

static inline int pfn_to_nid(unsigned long pfn)
{
	return highbits_to_node[__pfn_to_highbits(pfn)];
}

/*
 * Following are macros that each numa implmentation must define.
 */

#define node_start_pfn(nid)	(NODE_DATA(nid)->node_start_pfn)
#define node_end_pfn(nid)						\
({									\
	pg_data_t *__pgdat = NODE_DATA(nid);				\
	__pgdat->node_start_pfn + __pgdat->node_spanned_pages;		\
})

#define kern_addr_valid(kaddr)	virt_addr_valid((void *)kaddr)

static inline int pfn_valid(int pfn)
{
	int nid = pfn_to_nid(pfn);

	if (nid >= 0)
		return (pfn < node_end_pfn(nid));
	return 0;
}

/* Information on the NUMA nodes that we compute early */
extern unsigned long node_start_pfn[];
extern unsigned long node_end_pfn[];
extern unsigned long node_memmap_pfn[];
extern unsigned long node_percpu_pfn[];
extern unsigned long node_free_pfn[];
#ifdef CONFIG_HIGHMEM
extern unsigned long node_lowmem_end_pfn[];
#endif
#ifdef CONFIG_PCI
extern unsigned long pci_reserve_start_pfn;
extern unsigned long pci_reserve_end_pfn;
#endif

#endif /* CONFIG_DISCONTIGMEM */

#endif /* _ASM_TILE_MMZONE_H */