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4fe29a85 GOC |
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> | |
0fc0906e | 12 | #include <asm/mpspec.h> |
76eb4131 AS |
13 | #include <asm/apicdef.h> |
14 | ||
2fe60147 AS |
15 | unsigned int num_processors; |
16 | unsigned disabled_cpus __cpuinitdata; | |
17 | /* Processor that is doing the boot up */ | |
18 | unsigned int boot_cpu_physical_apicid = -1U; | |
19 | EXPORT_SYMBOL(boot_cpu_physical_apicid); | |
20 | ||
21 | physid_mask_t phys_cpu_present_map; | |
22 | ||
76eb4131 AS |
23 | DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID; |
24 | EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid); | |
4fe29a85 | 25 | |
0fc0906e AS |
26 | /* Bitmask of physically existing CPUs */ |
27 | physid_mask_t phys_cpu_present_map; | |
28 | ||
b447a468 | 29 | #if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_SMP) |
4fe29a85 GOC |
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) { | |
b447a468 MT |
40 | per_cpu(x86_cpu_to_apicid, cpu) = x86_cpu_to_apicid_init[cpu]; |
41 | per_cpu(x86_bios_cpu_apicid, cpu) = | |
4fe29a85 GOC |
42 | x86_bios_cpu_apicid_init[cpu]; |
43 | #ifdef CONFIG_NUMA | |
b447a468 | 44 | per_cpu(x86_cpu_to_node_map, cpu) = |
4fe29a85 | 45 | x86_cpu_to_node_map_init[cpu]; |
4fe29a85 GOC |
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_X86_32 | |
58 | /* | |
59 | * Great future not-so-futuristic plan: make i386 and x86_64 do it | |
60 | * the same way | |
61 | */ | |
62 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; | |
63 | EXPORT_SYMBOL(__per_cpu_offset); | |
64 | #endif | |
65 | ||
66 | /* | |
67 | * Great future plan: | |
68 | * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data. | |
69 | * Always point %gs to its beginning | |
70 | */ | |
71 | void __init setup_per_cpu_areas(void) | |
72 | { | |
73 | int i; | |
74 | unsigned long size; | |
75 | ||
76 | #ifdef CONFIG_HOTPLUG_CPU | |
77 | prefill_possible_map(); | |
78 | #endif | |
79 | ||
80 | /* Copy section for each CPU (we discard the original) */ | |
81 | size = PERCPU_ENOUGH_ROOM; | |
4fe29a85 GOC |
82 | printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n", |
83 | size); | |
b447a468 MT |
84 | |
85 | for_each_possible_cpu(i) { | |
4fe29a85 GOC |
86 | char *ptr; |
87 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
88 | ptr = alloc_bootmem_pages(size); | |
89 | #else | |
90 | int node = early_cpu_to_node(i); | |
b447a468 | 91 | if (!node_online(node) || !NODE_DATA(node)) { |
4fe29a85 | 92 | ptr = alloc_bootmem_pages(size); |
b447a468 MT |
93 | printk(KERN_INFO |
94 | "cpu %d has no node or node-local memory\n", i); | |
95 | } | |
4fe29a85 GOC |
96 | else |
97 | ptr = alloc_bootmem_pages_node(NODE_DATA(node), size); | |
98 | #endif | |
99 | if (!ptr) | |
100 | panic("Cannot allocate cpu data for CPU %d\n", i); | |
101 | #ifdef CONFIG_X86_64 | |
102 | cpu_pda(i)->data_offset = ptr - __per_cpu_start; | |
103 | #else | |
104 | __per_cpu_offset[i] = ptr - __per_cpu_start; | |
105 | #endif | |
106 | memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); | |
107 | } | |
108 | ||
b447a468 | 109 | /* Setup percpu data maps */ |
4fe29a85 GOC |
110 | setup_per_cpu_maps(); |
111 | } | |
112 | ||
113 | #endif |