| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _PARISC_MMZONE_H |
| 3 | #define _PARISC_MMZONE_H |
| 4 | |
| 5 | #define MAX_PHYSMEM_RANGES 8 /* Fix the size for now (current known max is 3) */ |
| 6 | |
| 7 | #ifdef CONFIG_DISCONTIGMEM |
| 8 | |
| 9 | extern int npmem_ranges; |
| 10 | |
| 11 | struct node_map_data { |
| 12 | pg_data_t pg_data; |
| 13 | }; |
| 14 | |
| 15 | extern struct node_map_data node_data[]; |
| 16 | |
| 17 | #define NODE_DATA(nid) (&node_data[nid].pg_data) |
| 18 | |
| 19 | /* We have these possible memory map layouts: |
| 20 | * Astro: 0-3.75, 67.75-68, 4-64 |
| 21 | * zx1: 0-1, 257-260, 4-256 |
| 22 | * Stretch (N-class): 0-2, 4-32, 34-xxx |
| 23 | */ |
| 24 | |
| 25 | /* Since each 1GB can only belong to one region (node), we can create |
| 26 | * an index table for pfn to nid lookup; each entry in pfnnid_map |
| 27 | * represents 1GB, and contains the node that the memory belongs to. */ |
| 28 | |
| 29 | #define PFNNID_SHIFT (30 - PAGE_SHIFT) |
| 30 | #define PFNNID_MAP_MAX 512 /* support 512GB */ |
| 31 | extern signed char pfnnid_map[PFNNID_MAP_MAX]; |
| 32 | |
| 33 | #ifndef CONFIG_64BIT |
| 34 | #define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT)) |
| 35 | #else |
| 36 | /* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */ |
| 37 | #define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT)) |
| 38 | #endif |
| 39 | |
| 40 | static inline int pfn_to_nid(unsigned long pfn) |
| 41 | { |
| 42 | unsigned int i; |
| 43 | |
| 44 | if (unlikely(pfn_is_io(pfn))) |
| 45 | return 0; |
| 46 | |
| 47 | i = pfn >> PFNNID_SHIFT; |
| 48 | BUG_ON(i >= ARRAY_SIZE(pfnnid_map)); |
| 49 | |
| 50 | return pfnnid_map[i]; |
| 51 | } |
| 52 | |
| 53 | static inline int pfn_valid(int pfn) |
| 54 | { |
| 55 | int nid = pfn_to_nid(pfn); |
| 56 | |
| 57 | if (nid >= 0) |
| 58 | return (pfn < node_end_pfn(nid)); |
| 59 | return 0; |
| 60 | } |
| 61 | |
| 62 | #endif |
| 63 | #endif /* _PARISC_MMZONE_H */ |