41 lines
843 B
C
41 lines
843 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
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*/
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#ifndef _ASM_ARC_MMZONE_H
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#define _ASM_ARC_MMZONE_H
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#ifdef CONFIG_DISCONTIGMEM
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extern struct pglist_data node_data[];
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#define NODE_DATA(nid) (&node_data[nid])
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static inline int pfn_to_nid(unsigned long pfn)
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{
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int is_end_low = 1;
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if (IS_ENABLED(CONFIG_ARC_HAS_PAE40))
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is_end_low = pfn <= virt_to_pfn(0xFFFFFFFFUL);
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/*
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* node 0: lowmem: 0x8000_0000 to 0xFFFF_FFFF
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* node 1: HIGHMEM w/o PAE40: 0x0 to 0x7FFF_FFFF
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* HIGHMEM with PAE40: 0x1_0000_0000 to ...
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*/
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if (pfn >= ARCH_PFN_OFFSET && is_end_low)
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return 0;
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return 1;
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}
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static inline int pfn_valid(unsigned long pfn)
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{
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int nid = pfn_to_nid(pfn);
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return (pfn <= node_end_pfn(nid));
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}
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#endif /* CONFIG_DISCONTIGMEM */
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#endif
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