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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
4 *
5 */
6
7#ifndef _ASM_MMZONE_H_
8#define _ASM_MMZONE_H_
9
10#include <asm/smp.h>
11
12#ifdef CONFIG_DISCONTIGMEM
13
14extern struct pglist_data *node_data[];
15#define NODE_DATA(nid) (node_data[nid])
16
17#define node_localnr(pfn, nid) ((pfn) - NODE_DATA(nid)->node_start_pfn)
18
19#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
20/*
21 * pfn_valid should be made as fast as possible, and the current definition
22 * is valid for machines that are NUMA, but still contiguous, which is what
23 * is currently supported. A more generalised, but slower definition would
24 * be something like this - mbligh:
25 * ( pfn_to_pgdat(pfn) && ((pfn) < node_end_pfn(pfn_to_nid(pfn))) )
26 */
27#if 1 /* M32R_FIXME */
28#define pfn_valid(pfn) (1)
29#else
30#define pfn_valid(pfn) ((pfn) < num_physpages)
31#endif
32
33/*
34 * generic node memory support, the following assumptions apply:
35 */
36
37static __inline__ int pfn_to_nid(unsigned long pfn)
38{
39 int node;
40
41 for (node = 0 ; node < MAX_NUMNODES ; node++)
42 if (pfn >= node_start_pfn(node) && pfn < node_end_pfn(node))
43 break;
44
45 return node;
46}
47
48static __inline__ struct pglist_data *pfn_to_pgdat(unsigned long pfn)
49{
50 return(NODE_DATA(pfn_to_nid(pfn)));
51}
52
53#endif /* CONFIG_DISCONTIGMEM */
54#endif /* _ASM_MMZONE_H_ */