Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6
[linux-2.6] / arch / x86 / kernel / setup.c
1 #include <linux/kernel.h>
2 #include <linux/module.h>
3 #include <linux/init.h>
4 #include <linux/bootmem.h>
5 #include <linux/percpu.h>
6 #include <asm/smp.h>
7 #include <asm/percpu.h>
8 #include <asm/sections.h>
9 #include <asm/processor.h>
10 #include <asm/setup.h>
11 #include <asm/topology.h>
12 #include <asm/mpspec.h>
13 #include <asm/apicdef.h>
14
15 #ifdef CONFIG_X86_LOCAL_APIC
16 unsigned int num_processors;
17 unsigned disabled_cpus __cpuinitdata;
18 /* Processor that is doing the boot up */
19 unsigned int boot_cpu_physical_apicid = -1U;
20 EXPORT_SYMBOL(boot_cpu_physical_apicid);
21
22 DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID;
23 EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
24
25 /* Bitmask of physically existing CPUs */
26 physid_mask_t phys_cpu_present_map;
27 #endif
28
29 #if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
30 /*
31  * Copy data used in early init routines from the initial arrays to the
32  * per cpu data areas.  These arrays then become expendable and the
33  * *_early_ptr's are zeroed indicating that the static arrays are gone.
34  */
35 static void __init setup_per_cpu_maps(void)
36 {
37         int cpu;
38
39         for_each_possible_cpu(cpu) {
40                 per_cpu(x86_cpu_to_apicid, cpu) = x86_cpu_to_apicid_init[cpu];
41                 per_cpu(x86_bios_cpu_apicid, cpu) =
42                                                 x86_bios_cpu_apicid_init[cpu];
43 #ifdef CONFIG_NUMA
44                 per_cpu(x86_cpu_to_node_map, cpu) =
45                                                 x86_cpu_to_node_map_init[cpu];
46 #endif
47         }
48
49         /* indicate the early static arrays will soon be gone */
50         x86_cpu_to_apicid_early_ptr = NULL;
51         x86_bios_cpu_apicid_early_ptr = NULL;
52 #ifdef CONFIG_NUMA
53         x86_cpu_to_node_map_early_ptr = NULL;
54 #endif
55 }
56
57 #ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
58 cpumask_t *cpumask_of_cpu_map __read_mostly;
59 EXPORT_SYMBOL(cpumask_of_cpu_map);
60
61 /* requires nr_cpu_ids to be initialized */
62 static void __init setup_cpumask_of_cpu(void)
63 {
64         int i;
65
66         /* alloc_bootmem zeroes memory */
67         cpumask_of_cpu_map = alloc_bootmem_low(sizeof(cpumask_t) * nr_cpu_ids);
68         for (i = 0; i < nr_cpu_ids; i++)
69                 cpu_set(i, cpumask_of_cpu_map[i]);
70 }
71 #else
72 static inline void setup_cpumask_of_cpu(void) { }
73 #endif
74
75 #ifdef CONFIG_X86_32
76 /*
77  * Great future not-so-futuristic plan: make i386 and x86_64 do it
78  * the same way
79  */
80 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
81 EXPORT_SYMBOL(__per_cpu_offset);
82 #endif
83
84 /*
85  * Great future plan:
86  * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
87  * Always point %gs to its beginning
88  */
89 void __init setup_per_cpu_areas(void)
90 {
91         int i, highest_cpu = 0;
92         unsigned long size;
93
94 #ifdef CONFIG_HOTPLUG_CPU
95         prefill_possible_map();
96 #endif
97
98         /* Copy section for each CPU (we discard the original) */
99         size = PERCPU_ENOUGH_ROOM;
100         printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n",
101                           size);
102
103         for_each_possible_cpu(i) {
104                 char *ptr;
105 #ifndef CONFIG_NEED_MULTIPLE_NODES
106                 ptr = alloc_bootmem_pages(size);
107 #else
108                 int node = early_cpu_to_node(i);
109                 if (!node_online(node) || !NODE_DATA(node)) {
110                         ptr = alloc_bootmem_pages(size);
111                         printk(KERN_INFO
112                                "cpu %d has no node or node-local memory\n", i);
113                 }
114                 else
115                         ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
116 #endif
117                 if (!ptr)
118                         panic("Cannot allocate cpu data for CPU %d\n", i);
119 #ifdef CONFIG_X86_64
120                 cpu_pda(i)->data_offset = ptr - __per_cpu_start;
121 #else
122                 __per_cpu_offset[i] = ptr - __per_cpu_start;
123 #endif
124                 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
125
126                 highest_cpu = i;
127         }
128
129         nr_cpu_ids = highest_cpu + 1;
130         printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d\n", NR_CPUS, nr_cpu_ids);
131
132         /* Setup percpu data maps */
133         setup_per_cpu_maps();
134
135         /* Setup cpumask_of_cpu map */
136         setup_cpumask_of_cpu();
137 }
138
139 #endif