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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 | ||
76eb4131 AS |
21 | DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID; |
22 | EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid); | |
4fe29a85 | 23 | |
0fc0906e AS |
24 | /* Bitmask of physically existing CPUs */ |
25 | physid_mask_t phys_cpu_present_map; | |
26 | ||
b447a468 | 27 | #if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_SMP) |
4fe29a85 GOC |
28 | /* |
29 | * Copy data used in early init routines from the initial arrays to the | |
30 | * per cpu data areas. These arrays then become expendable and the | |
31 | * *_early_ptr's are zeroed indicating that the static arrays are gone. | |
32 | */ | |
33 | static void __init setup_per_cpu_maps(void) | |
34 | { | |
35 | int cpu; | |
36 | ||
37 | for_each_possible_cpu(cpu) { | |
b447a468 MT |
38 | per_cpu(x86_cpu_to_apicid, cpu) = x86_cpu_to_apicid_init[cpu]; |
39 | per_cpu(x86_bios_cpu_apicid, cpu) = | |
4fe29a85 GOC |
40 | x86_bios_cpu_apicid_init[cpu]; |
41 | #ifdef CONFIG_NUMA | |
b447a468 | 42 | per_cpu(x86_cpu_to_node_map, cpu) = |
4fe29a85 | 43 | x86_cpu_to_node_map_init[cpu]; |
4fe29a85 GOC |
44 | #endif |
45 | } | |
46 | ||
47 | /* indicate the early static arrays will soon be gone */ | |
48 | x86_cpu_to_apicid_early_ptr = NULL; | |
49 | x86_bios_cpu_apicid_early_ptr = NULL; | |
50 | #ifdef CONFIG_NUMA | |
51 | x86_cpu_to_node_map_early_ptr = NULL; | |
52 | #endif | |
53 | } | |
54 | ||
9f0e8d04 MT |
55 | #ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP |
56 | cpumask_t *cpumask_of_cpu_map __read_mostly; | |
57 | EXPORT_SYMBOL(cpumask_of_cpu_map); | |
58 | ||
59 | /* requires nr_cpu_ids to be initialized */ | |
60 | static void __init setup_cpumask_of_cpu(void) | |
61 | { | |
62 | int i; | |
63 | ||
64 | /* alloc_bootmem zeroes memory */ | |
65 | cpumask_of_cpu_map = alloc_bootmem_low(sizeof(cpumask_t) * nr_cpu_ids); | |
66 | for (i = 0; i < nr_cpu_ids; i++) | |
67 | cpu_set(i, cpumask_of_cpu_map[i]); | |
68 | } | |
69 | #else | |
70 | static inline void setup_cpumask_of_cpu(void) { } | |
71 | #endif | |
72 | ||
4fe29a85 GOC |
73 | #ifdef CONFIG_X86_32 |
74 | /* | |
75 | * Great future not-so-futuristic plan: make i386 and x86_64 do it | |
76 | * the same way | |
77 | */ | |
78 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; | |
79 | EXPORT_SYMBOL(__per_cpu_offset); | |
80 | #endif | |
81 | ||
82 | /* | |
83 | * Great future plan: | |
84 | * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data. | |
85 | * Always point %gs to its beginning | |
86 | */ | |
87 | void __init setup_per_cpu_areas(void) | |
88 | { | |
9f0e8d04 | 89 | int i, highest_cpu = 0; |
4fe29a85 GOC |
90 | unsigned long size; |
91 | ||
92 | #ifdef CONFIG_HOTPLUG_CPU | |
93 | prefill_possible_map(); | |
94 | #endif | |
95 | ||
96 | /* Copy section for each CPU (we discard the original) */ | |
97 | size = PERCPU_ENOUGH_ROOM; | |
4fe29a85 GOC |
98 | printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n", |
99 | size); | |
b447a468 MT |
100 | |
101 | for_each_possible_cpu(i) { | |
4fe29a85 GOC |
102 | char *ptr; |
103 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
104 | ptr = alloc_bootmem_pages(size); | |
105 | #else | |
106 | int node = early_cpu_to_node(i); | |
b447a468 | 107 | if (!node_online(node) || !NODE_DATA(node)) { |
4fe29a85 | 108 | ptr = alloc_bootmem_pages(size); |
b447a468 MT |
109 | printk(KERN_INFO |
110 | "cpu %d has no node or node-local memory\n", i); | |
111 | } | |
4fe29a85 GOC |
112 | else |
113 | ptr = alloc_bootmem_pages_node(NODE_DATA(node), size); | |
114 | #endif | |
115 | if (!ptr) | |
116 | panic("Cannot allocate cpu data for CPU %d\n", i); | |
117 | #ifdef CONFIG_X86_64 | |
118 | cpu_pda(i)->data_offset = ptr - __per_cpu_start; | |
119 | #else | |
120 | __per_cpu_offset[i] = ptr - __per_cpu_start; | |
121 | #endif | |
122 | memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); | |
9f0e8d04 MT |
123 | |
124 | highest_cpu = i; | |
4fe29a85 GOC |
125 | } |
126 | ||
9f0e8d04 MT |
127 | nr_cpu_ids = highest_cpu + 1; |
128 | printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d\n", NR_CPUS, nr_cpu_ids); | |
129 | ||
b447a468 | 130 | /* Setup percpu data maps */ |
4fe29a85 | 131 | setup_per_cpu_maps(); |
9f0e8d04 MT |
132 | |
133 | /* Setup cpumask_of_cpu map */ | |
134 | setup_cpumask_of_cpu(); | |
4fe29a85 GOC |
135 | } |
136 | ||
137 | #endif |