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 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
);
21 DEFINE_PER_CPU(u16
, x86_cpu_to_apicid
) = BAD_APICID
;
22 EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid
);
24 /* Bitmask of physically existing CPUs */
25 physid_mask_t phys_cpu_present_map
;
27 #if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_SMP)
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.
33 static void __init
setup_per_cpu_maps(void)
37 for_each_possible_cpu(cpu
) {
38 per_cpu(x86_cpu_to_apicid
, cpu
) = x86_cpu_to_apicid_init
[cpu
];
39 per_cpu(x86_bios_cpu_apicid
, cpu
) =
40 x86_bios_cpu_apicid_init
[cpu
];
42 per_cpu(x86_cpu_to_node_map
, cpu
) =
43 x86_cpu_to_node_map_init
[cpu
];
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
;
51 x86_cpu_to_node_map_early_ptr
= NULL
;
55 #ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
56 cpumask_t
*cpumask_of_cpu_map __read_mostly
;
57 EXPORT_SYMBOL(cpumask_of_cpu_map
);
59 /* requires nr_cpu_ids to be initialized */
60 static void __init
setup_cpumask_of_cpu(void)
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
]);
70 static inline void setup_cpumask_of_cpu(void) { }
75 * Great future not-so-futuristic plan: make i386 and x86_64 do it
78 unsigned long __per_cpu_offset
[NR_CPUS
] __read_mostly
;
79 EXPORT_SYMBOL(__per_cpu_offset
);
84 * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
85 * Always point %gs to its beginning
87 void __init
setup_per_cpu_areas(void)
89 int i
, highest_cpu
= 0;
92 #ifdef CONFIG_HOTPLUG_CPU
93 prefill_possible_map();
96 /* Copy section for each CPU (we discard the original) */
97 size
= PERCPU_ENOUGH_ROOM
;
98 printk(KERN_INFO
"PERCPU: Allocating %lu bytes of per cpu data\n",
101 for_each_possible_cpu(i
) {
103 #ifndef CONFIG_NEED_MULTIPLE_NODES
104 ptr
= alloc_bootmem_pages(size
);
106 int node
= early_cpu_to_node(i
);
107 if (!node_online(node
) || !NODE_DATA(node
)) {
108 ptr
= alloc_bootmem_pages(size
);
110 "cpu %d has no node or node-local memory\n", i
);
113 ptr
= alloc_bootmem_pages_node(NODE_DATA(node
), size
);
116 panic("Cannot allocate cpu data for CPU %d\n", i
);
118 cpu_pda(i
)->data_offset
= ptr
- __per_cpu_start
;
120 __per_cpu_offset
[i
] = ptr
- __per_cpu_start
;
122 memcpy(ptr
, __per_cpu_start
, __per_cpu_end
- __per_cpu_start
);
127 nr_cpu_ids
= highest_cpu
+ 1;
128 printk(KERN_DEBUG
"NR_CPUS: %d, nr_cpu_ids: %d\n", NR_CPUS
, nr_cpu_ids
);
130 /* Setup percpu data maps */
131 setup_per_cpu_maps();
133 /* Setup cpumask_of_cpu map */
134 setup_cpumask_of_cpu();