| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com) |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 4 | */ |
| 5 | |
| 6 | #ifndef _ASM_ARC_MMZONE_H |
| 7 | #define _ASM_ARC_MMZONE_H |
| 8 | |
| 9 | #ifdef CONFIG_DISCONTIGMEM |
| 10 | |
| 11 | extern struct pglist_data node_data[]; |
| 12 | #define NODE_DATA(nid) (&node_data[nid]) |
| 13 | |
| 14 | static inline int pfn_to_nid(unsigned long pfn) |
| 15 | { |
| 16 | int is_end_low = 1; |
| 17 | |
| 18 | if (IS_ENABLED(CONFIG_ARC_HAS_PAE40)) |
| 19 | is_end_low = pfn <= virt_to_pfn(0xFFFFFFFFUL); |
| 20 | |
| 21 | /* |
| 22 | * node 0: lowmem: 0x8000_0000 to 0xFFFF_FFFF |
| 23 | * node 1: HIGHMEM w/o PAE40: 0x0 to 0x7FFF_FFFF |
| 24 | * HIGHMEM with PAE40: 0x1_0000_0000 to ... |
| 25 | */ |
| 26 | if (pfn >= ARCH_PFN_OFFSET && is_end_low) |
| 27 | return 0; |
| 28 | |
| 29 | return 1; |
| 30 | } |
| 31 | |
| 32 | static inline int pfn_valid(unsigned long pfn) |
| 33 | { |
| 34 | int nid = pfn_to_nid(pfn); |
| 35 | |
| 36 | return (pfn <= node_end_pfn(nid)); |
| 37 | } |
| 38 | #endif /* CONFIG_DISCONTIGMEM */ |
| 39 | |
| 40 | #endif |