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/*
* Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _ASM_ARC_MMZONE_H
#define _ASM_ARC_MMZONE_H
#ifdef CONFIG_DISCONTIGMEM
extern struct pglist_data node_data[];
#define NODE_DATA(nid) (&node_data[nid])
static inline int pfn_to_nid(unsigned long pfn)
{
int is_end_low = 1;
if (IS_ENABLED(CONFIG_ARC_HAS_PAE40))
is_end_low = pfn <= virt_to_pfn(0xFFFFFFFFUL);
/*
* node 0: lowmem: 0x8000_0000 to 0xFFFF_FFFF
* node 1: HIGHMEM w/o PAE40: 0x0 to 0x7FFF_FFFF
* HIGHMEM with PAE40: 0x1_0000_0000 to ...
*/
if (pfn >= ARCH_PFN_OFFSET && is_end_low)
return 0;
return 1;
}
static inline int pfn_valid(unsigned long pfn)
{
int nid = pfn_to_nid(pfn);
return (pfn <= node_end_pfn(nid));
}
#endif /* CONFIG_DISCONTIGMEM */
#endif
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