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Diffstat (limited to 'arch/ia64/mm/numa.c')
| -rw-r--r-- | arch/ia64/mm/numa.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/ia64/mm/numa.c b/arch/ia64/mm/numa.c new file mode 100644 index 00000000000..77118bbf3d8 --- /dev/null +++ b/arch/ia64/mm/numa.c @@ -0,0 +1,49 @@ +/* + * 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); +} |