x86_64: move vdso
[linux-2.6.git] / arch / x86 / pci / k8-bus_64.c
1 #include <linux/init.h>
2 #include <linux/pci.h>
3 #include <asm/mpspec.h>
4 #include <linux/cpumask.h>
5
6 /*
7  * This discovers the pcibus <-> node mapping on AMD K8.
8  *
9  * RED-PEN need to call this again on PCI hotplug
10  * RED-PEN empty cpus get reported wrong
11  */
12
13 #define NODE_ID_REGISTER 0x60
14 #define NODE_ID(dword) (dword & 0x07)
15 #define LDT_BUS_NUMBER_REGISTER_0 0x94
16 #define LDT_BUS_NUMBER_REGISTER_1 0xB4
17 #define LDT_BUS_NUMBER_REGISTER_2 0xD4
18 #define NR_LDT_BUS_NUMBER_REGISTERS 3
19 #define SECONDARY_LDT_BUS_NUMBER(dword) ((dword >> 8) & 0xFF)
20 #define SUBORDINATE_LDT_BUS_NUMBER(dword) ((dword >> 16) & 0xFF)
21 #define PCI_DEVICE_ID_K8HTCONFIG 0x1100
22
23 /**
24  * fill_mp_bus_to_cpumask()
25  * fills the mp_bus_to_cpumask array based according to the LDT Bus Number
26  * Registers found in the K8 northbridge
27  */
28 __init static int
29 fill_mp_bus_to_cpumask(void)
30 {
31         struct pci_dev *nb_dev = NULL;
32         int i, j;
33         u32 ldtbus, nid;
34         static int lbnr[3] = {
35                 LDT_BUS_NUMBER_REGISTER_0,
36                 LDT_BUS_NUMBER_REGISTER_1,
37                 LDT_BUS_NUMBER_REGISTER_2
38         };
39
40         while ((nb_dev = pci_get_device(PCI_VENDOR_ID_AMD,
41                         PCI_DEVICE_ID_K8HTCONFIG, nb_dev))) {
42                 pci_read_config_dword(nb_dev, NODE_ID_REGISTER, &nid);
43
44                 for (i = 0; i < NR_LDT_BUS_NUMBER_REGISTERS; i++) {
45                         pci_read_config_dword(nb_dev, lbnr[i], &ldtbus);
46                         /*
47                          * if there are no busses hanging off of the current
48                          * ldt link then both the secondary and subordinate
49                          * bus number fields are set to 0.
50                          * 
51                          * RED-PEN
52                          * This is slightly broken because it assumes
53                          * HT node IDs == Linux node ids, which is not always
54                          * true. However it is probably mostly true.
55                          */
56                         if (!(SECONDARY_LDT_BUS_NUMBER(ldtbus) == 0
57                                 && SUBORDINATE_LDT_BUS_NUMBER(ldtbus) == 0)) {
58                                 for (j = SECONDARY_LDT_BUS_NUMBER(ldtbus);
59                                      j <= SUBORDINATE_LDT_BUS_NUMBER(ldtbus);
60                                      j++) { 
61                                         struct pci_bus *bus;
62                                         struct pci_sysdata *sd;
63
64                                         long node = NODE_ID(nid);
65                                         /* Algorithm a bit dumb, but
66                                            it shouldn't matter here */
67                                         bus = pci_find_bus(0, j);
68                                         if (!bus)
69                                                 continue;
70                                         if (!node_online(node))
71                                                 node = 0;
72
73                                         sd = bus->sysdata;
74                                         sd->node = node;
75                                 }               
76                         }
77                 }
78         }
79
80         return 0;
81 }
82
83 fs_initcall(fill_mp_bus_to_cpumask);