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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 | ||
f8955ebe | 15 | #ifdef CONFIG_X86_LOCAL_APIC |
2fe60147 AS |
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 | ||
76eb4131 AS |
22 | DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID; |
23 | EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid); | |
4fe29a85 | 24 | |
0fc0906e AS |
25 | /* Bitmask of physically existing CPUs */ |
26 | physid_mask_t phys_cpu_present_map; | |
f8955ebe | 27 | #endif |
0fc0906e | 28 | |
f8955ebe | 29 | #if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_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 | ||
9f0e8d04 MT |
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 | ||
4fe29a85 GOC |
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 | { | |
9f0e8d04 | 91 | int i, highest_cpu = 0; |
4fe29a85 GOC |
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; | |
5ecddceb | 100 | printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n", |
4fe29a85 | 101 | size); |
b447a468 MT |
102 | |
103 | for_each_possible_cpu(i) { | |
4fe29a85 GOC |
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); | |
b447a468 | 109 | if (!node_online(node) || !NODE_DATA(node)) { |
4fe29a85 | 110 | ptr = alloc_bootmem_pages(size); |
b447a468 MT |
111 | printk(KERN_INFO |
112 | "cpu %d has no node or node-local memory\n", i); | |
113 | } | |
4fe29a85 GOC |
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); | |
9f0e8d04 MT |
125 | |
126 | highest_cpu = i; | |
4fe29a85 GOC |
127 | } |
128 | ||
9f0e8d04 MT |
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 | ||
b447a468 | 132 | /* Setup percpu data maps */ |
4fe29a85 | 133 | setup_per_cpu_maps(); |
9f0e8d04 MT |
134 | |
135 | /* Setup cpumask_of_cpu map */ | |
136 | setup_cpumask_of_cpu(); | |
4fe29a85 GOC |
137 | } |
138 | ||
139 | #endif |