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26f9d5fd VG |
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 | ||
14 | extern struct pglist_data node_data[]; | |
15 | #define NODE_DATA(nid) (&node_data[nid]) | |
16 | ||
17 | static 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 | ||
35 | static 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 |