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