| Vineet Gupta | 26f9d5f | 2016-04-18 10:49:56 +0530 | [diff] [blame] | 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 |