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>
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>
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);
22 /* Bitmask of physically existing CPUs */
23 physid_mask_t phys_cpu_present_map;
26 /* map cpu index to physical APIC ID */
27 DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID);
28 DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID);
29 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
30 EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
32 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
35 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
36 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
39 #if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
41 * Copy data used in early init routines from the initial arrays to the
42 * per cpu data areas. These arrays then become expendable and the
43 * *_early_ptr's are zeroed indicating that the static arrays are gone.
45 static void __init setup_per_cpu_maps(void)
49 for_each_possible_cpu(cpu) {
50 per_cpu(x86_cpu_to_apicid, cpu) =
51 early_per_cpu_map(x86_cpu_to_apicid, cpu);
52 per_cpu(x86_bios_cpu_apicid, cpu) =
53 early_per_cpu_map(x86_bios_cpu_apicid, cpu);
55 per_cpu(x86_cpu_to_node_map, cpu) =
56 early_per_cpu_map(x86_cpu_to_node_map, cpu);
60 /* indicate the early static arrays will soon be gone */
61 early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
62 early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
64 early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
68 #ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
69 cpumask_t *cpumask_of_cpu_map __read_mostly;
70 EXPORT_SYMBOL(cpumask_of_cpu_map);
72 /* requires nr_cpu_ids to be initialized */
73 static void __init setup_cpumask_of_cpu(void)
77 /* alloc_bootmem zeroes memory */
78 cpumask_of_cpu_map = alloc_bootmem_low(sizeof(cpumask_t) * nr_cpu_ids);
79 for (i = 0; i < nr_cpu_ids; i++)
80 cpu_set(i, cpumask_of_cpu_map[i]);
83 static inline void setup_cpumask_of_cpu(void) { }
88 * Great future not-so-futuristic plan: make i386 and x86_64 do it
91 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
92 EXPORT_SYMBOL(__per_cpu_offset);
97 * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
98 * Always point %gs to its beginning
100 void __init setup_per_cpu_areas(void)
102 int i, highest_cpu = 0;
105 #ifdef CONFIG_HOTPLUG_CPU
106 prefill_possible_map();
109 /* Copy section for each CPU (we discard the original) */
110 size = PERCPU_ENOUGH_ROOM;
111 printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n",
114 for_each_possible_cpu(i) {
116 #ifndef CONFIG_NEED_MULTIPLE_NODES
117 ptr = alloc_bootmem_pages(size);
119 int node = early_cpu_to_node(i);
120 if (!node_online(node) || !NODE_DATA(node)) {
121 ptr = alloc_bootmem_pages(size);
123 "cpu %d has no node %d or node-local memory\n",
127 ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
130 panic("Cannot allocate cpu data for CPU %d\n", i);
132 cpu_pda(i)->data_offset = ptr - __per_cpu_start;
134 __per_cpu_offset[i] = ptr - __per_cpu_start;
136 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
141 nr_cpu_ids = highest_cpu + 1;
142 printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d\n", NR_CPUS, nr_cpu_ids);
144 /* Setup percpu data maps */
145 setup_per_cpu_maps();
147 /* Setup cpumask_of_cpu map */
148 setup_cpumask_of_cpu();
154 void __cpuinit numa_set_node(int cpu, int node)
156 int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
159 cpu_to_node_map[cpu] = node;
161 else if (per_cpu_offset(cpu))
162 per_cpu(x86_cpu_to_node_map, cpu) = node;
165 Dprintk(KERN_INFO "Setting node for non-present cpu %d\n", cpu);
168 void __cpuinit numa_clear_node(int cpu)
170 numa_set_node(cpu, NUMA_NO_NODE);
173 void __cpuinit numa_add_cpu(int cpu)
175 cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
178 void __cpuinit numa_remove_cpu(int cpu)
180 cpu_clear(cpu, node_to_cpumask_map[cpu_to_node(cpu)]);
182 #endif /* CONFIG_NUMA */
184 #if defined(CONFIG_DEBUG_PER_CPU_MAPS) && defined(CONFIG_X86_64)
186 int cpu_to_node(int cpu)
188 if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
190 "cpu_to_node(%d): usage too early!\n", cpu);
192 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
194 return per_cpu(x86_cpu_to_node_map, cpu);
196 EXPORT_SYMBOL(cpu_to_node);
198 int early_cpu_to_node(int cpu)
200 if (early_per_cpu_ptr(x86_cpu_to_node_map))
201 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
203 if (!per_cpu_offset(cpu)) {
205 "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
209 return per_cpu(x86_cpu_to_node_map, cpu);