50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* This file contains NUMA specific variables and functions which can
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* be split away from DISCONTIGMEM and are used on NUMA machines with
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* contiguous memory.
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*
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* 2002/08/07 Erich Focht <efocht@ess.nec.de>
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*/
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#include <linux/config.h>
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#include <linux/cpu.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/node.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <asm/mmzone.h>
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#include <asm/numa.h>
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/*
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* The following structures are usually initialized by ACPI or
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* similar mechanisms and describe the NUMA characteristics of the machine.
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*/
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int num_node_memblks;
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struct node_memblk_s node_memblk[NR_NODE_MEMBLKS];
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struct node_cpuid_s node_cpuid[NR_CPUS];
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/*
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* This is a matrix with "distances" between nodes, they should be
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* proportional to the memory access latency ratios.
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*/
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u8 numa_slit[MAX_NUMNODES * MAX_NUMNODES];
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/* Identify which cnode a physical address resides on */
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int
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paddr_to_nid(unsigned long paddr)
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{
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int i;
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for (i = 0; i < num_node_memblks; i++)
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if (paddr >= node_memblk[i].start_paddr &&
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paddr < node_memblk[i].start_paddr + node_memblk[i].size)
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break;
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return (i < num_node_memblks) ? node_memblk[i].nid : (num_node_memblks ? -1 : 0);
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}
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