1/*
 2 * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
 3 *
 4 * This program is free software; you can redistribute it and/or modify
 5 * it under the terms of the GNU General Public License version 2 as
 6 * published by the Free Software Foundation.
 7 */
 8
 9#ifndef _ASM_ARC_MMZONE_H
10#define _ASM_ARC_MMZONE_H
11
12#ifdef CONFIG_DISCONTIGMEM
13
14extern struct pglist_data node_data[];
15#define NODE_DATA(nid) (&node_data[nid])
16
17static inline int pfn_to_nid(unsigned long pfn)
18{
19	int is_end_low = 1;
20
21	if (IS_ENABLED(CONFIG_ARC_HAS_PAE40))
22		is_end_low = pfn <= virt_to_pfn(0xFFFFFFFFUL);
23
24	/*
25	 * node 0: lowmem:             0x8000_0000   to 0xFFFF_FFFF
26	 * node 1: HIGHMEM w/o  PAE40: 0x0           to 0x7FFF_FFFF
27	 *         HIGHMEM with PAE40: 0x1_0000_0000 to ...
28	 */
29	if (pfn >= ARCH_PFN_OFFSET && is_end_low)
30		return 0;
31
32	return 1;
33}
34
35static inline int pfn_valid(unsigned long pfn)
36{
37	int nid = pfn_to_nid(pfn);
38
39	return (pfn <= node_end_pfn(nid));
40}
41#endif /* CONFIG_DISCONTIGMEM  */
42
43#endif