x86_64: move mm

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 182 insertions, 0 deletions

diff --git a/arch/x86/mm/k8topology_64.c b/arch/x86/mm/k8topology_64.c
new file mode 100644
index 0000000..a96006f
--- /dev/null
+++ b/arch/x86/mm/k8topology_64.c
@@ -0,0 +1,182 @@
+/* 
+ * AMD K8 NUMA support.
+ * Discover the memory map and associated nodes.
+ * 
+ * This version reads it directly from the K8 northbridge.
+ * 
+ * Copyright 2002,2003 Andi Kleen, SuSE Labs.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/module.h>
+#include <linux/nodemask.h>
+#include <asm/io.h>
+#include <linux/pci_ids.h>
+#include <asm/types.h>
+#include <asm/mmzone.h>
+#include <asm/proto.h>
+#include <asm/e820.h>
+#include <asm/pci-direct.h>
+#include <asm/numa.h>
+
+static __init int find_northbridge(void)
+{
+	int num; 
+
+	for (num = 0; num < 32; num++) { 
+		u32 header;
+		
+		header = read_pci_config(0, num, 0, 0x00);  
+		if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)))
+			continue; 	
+
+		header = read_pci_config(0, num, 1, 0x00); 
+		if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)))
+			continue;	
+		return num; 
+	} 
+
+	return -1; 	
+}
+
+int __init k8_scan_nodes(unsigned long start, unsigned long end)
+{ 
+	unsigned long prevbase;
+	struct bootnode nodes[8];
+	int nodeid, i, j, nb;
+	unsigned char nodeids[8];
+	int found = 0;
+	u32 reg;
+	unsigned numnodes;
+	unsigned num_cores;
+
+	if (!early_pci_allowed())
+		return -1;
+
+	nb = find_northbridge(); 
+	if (nb < 0) 
+		return nb;
+
+	printk(KERN_INFO "Scanning NUMA topology in Northbridge %d\n", nb); 
+
+	num_cores = (cpuid_ecx(0x80000008) & 0xff) + 1;
+	printk(KERN_INFO "CPU has %d num_cores\n", num_cores);
+
+	reg = read_pci_config(0, nb, 0, 0x60); 
+	numnodes = ((reg >> 4) & 0xF) + 1;
+	if (numnodes <= 1)
+		return -1;
+
+	printk(KERN_INFO "Number of nodes %d\n", numnodes);
+
+	memset(&nodes,0,sizeof(nodes)); 
+	prevbase = 0;
+	for (i = 0; i < 8; i++) { 
+		unsigned long base,limit; 
+		u32 nodeid;
+		
+		base = read_pci_config(0, nb, 1, 0x40 + i*8);
+		limit = read_pci_config(0, nb, 1, 0x44 + i*8);
+
+		nodeid = limit & 7; 
+		nodeids[i] = nodeid;
+		if ((base & 3) == 0) { 
+			if (i < numnodes)
+				printk("Skipping disabled node %d\n", i); 
+			continue;
+		} 
+		if (nodeid >= numnodes) {
+			printk("Ignoring excess node %d (%lx:%lx)\n", nodeid,
+			       base, limit); 
+			continue;
+		} 
+
+		if (!limit) { 
+			printk(KERN_INFO "Skipping node entry %d (base %lx)\n", i,
+			       base);
+			continue;
+		}
+		if ((base >> 8) & 3 || (limit >> 8) & 3) {
+			printk(KERN_ERR "Node %d using interleaving mode %lx/%lx\n", 
+			       nodeid, (base>>8)&3, (limit>>8) & 3); 
+			return -1; 
+		}	
+		if (node_isset(nodeid, node_possible_map)) {
+			printk(KERN_INFO "Node %d already present. Skipping\n", 
+			       nodeid);
+			continue;
+		}
+
+		limit >>= 16; 
+		limit <<= 24; 
+		limit |= (1<<24)-1;
+		limit++;
+
+		if (limit > end_pfn << PAGE_SHIFT)
+			limit = end_pfn << PAGE_SHIFT;
+		if (limit <= base)
+			continue; 
+			
+		base >>= 16;
+		base <<= 24; 
+
+		if (base < start) 
+			base = start; 
+		if (limit > end) 
+			limit = end; 
+		if (limit == base) { 
+			printk(KERN_ERR "Empty node %d\n", nodeid); 
+			continue; 
+		}
+		if (limit < base) { 
+			printk(KERN_ERR "Node %d bogus settings %lx-%lx.\n",
+			       nodeid, base, limit); 			       
+			continue;
+		} 
+		
+		/* Could sort here, but pun for now. Should not happen anyroads. */
+		if (prevbase > base) { 
+			printk(KERN_ERR "Node map not sorted %lx,%lx\n",
+			       prevbase,base);
+			return -1;
+		}
+			
+		printk(KERN_INFO "Node %d MemBase %016lx Limit %016lx\n", 
+		       nodeid, base, limit); 
+		
+		found++;
+		
+		nodes[nodeid].start = base; 
+		nodes[nodeid].end = limit;
+		e820_register_active_regions(nodeid,
+				nodes[nodeid].start >> PAGE_SHIFT,
+				nodes[nodeid].end >> PAGE_SHIFT);
+
+		prevbase = base;
+
+		node_set(nodeid, node_possible_map);
+	} 
+
+	if (!found)
+		return -1; 
+
+	memnode_shift = compute_hash_shift(nodes, 8);
+	if (memnode_shift < 0) { 
+		printk(KERN_ERR "No NUMA node hash function found. Contact maintainer\n"); 
+		return -1; 
+	} 
+	printk(KERN_INFO "Using node hash shift of %d\n", memnode_shift); 
+
+	for (i = 0; i < 8; i++) {
+		if (nodes[i].start != nodes[i].end) { 
+			nodeid = nodeids[i];
+			for (j = 0; j < num_cores; j++)
+				apicid_to_node[(nodeid * num_cores) + j] = i;
+			setup_node_bootmem(i, nodes[i].start, nodes[i].end); 
+		} 
+	}
+
+	numa_init_array();
+	return 0;
+}