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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