arch/x86/kernel/setup.c

   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>
  12 #include <asm/mpspec.h>
  13 #include <asm/apicdef.h>
  14
  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 unsigned int max_physical_apicid;
  21 EXPORT_SYMBOL(boot_cpu_physical_apicid);
  22
  23 DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID;
  24 EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
  25
  26 /* Bitmask of physically existing CPUs */
  27 physid_mask_t phys_cpu_present_map;
  28 #endif
  29
  30 #if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
  31 /*
  32  * Copy data used in early init routines from the initial arrays to the
  33  * per cpu data areas.  These arrays then become expendable and the
  34  * *_early_ptr's are zeroed indicating that the static arrays are gone.
  35  */
  36 static void __init setup_per_cpu_maps(void)
  37 {
  38         int cpu;
  39
  40         for_each_possible_cpu(cpu) {
  41                 per_cpu(x86_cpu_to_apicid, cpu) = x86_cpu_to_apicid_init[cpu];
  42                 per_cpu(x86_bios_cpu_apicid, cpu) =
  43                                                 x86_bios_cpu_apicid_init[cpu];
  44 #ifdef CONFIG_NUMA
  45                 per_cpu(x86_cpu_to_node_map, cpu) =
  46                                                 x86_cpu_to_node_map_init[cpu];
  47 #endif
  48         }
  49
  50         /* indicate the early static arrays will soon be gone */
  51         x86_cpu_to_apicid_early_ptr = NULL;
  52         x86_bios_cpu_apicid_early_ptr = NULL;
  53 #ifdef CONFIG_NUMA
  54         x86_cpu_to_node_map_early_ptr = NULL;
  55 #endif
  56 }
  57
  58 #ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
  59 cpumask_t *cpumask_of_cpu_map __read_mostly;
  60 EXPORT_SYMBOL(cpumask_of_cpu_map);
  61
  62 /* requires nr_cpu_ids to be initialized */
  63 static void __init setup_cpumask_of_cpu(void)
  64 {
  65         int i;
  66
  67         /* alloc_bootmem zeroes memory */
  68         cpumask_of_cpu_map = alloc_bootmem_low(sizeof(cpumask_t) * nr_cpu_ids);
  69         for (i = 0; i < nr_cpu_ids; i++)
  70                 cpu_set(i, cpumask_of_cpu_map[i]);
  71 }
  72 #else
  73 static inline void setup_cpumask_of_cpu(void) { }
  74 #endif
  75
  76 #ifdef CONFIG_X86_32
  77 /*
  78  * Great future not-so-futuristic plan: make i386 and x86_64 do it
  79  * the same way
  80  */
  81 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
  82 EXPORT_SYMBOL(__per_cpu_offset);
  83 #endif
  84
  85 /*
  86  * Great future plan:
  87  * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
  88  * Always point %gs to its beginning
  89  */
  90 void __init setup_per_cpu_areas(void)
  91 {
  92         int i, highest_cpu = 0;
  93         unsigned long size;
  94
  95 #ifdef CONFIG_HOTPLUG_CPU
  96         prefill_possible_map();
  97 #endif
  98
  99         /* Copy section for each CPU (we discard the original) */
 100         size = PERCPU_ENOUGH_ROOM;
 101         printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n",
 102                           size);
 103
 104         for_each_possible_cpu(i) {
 105                 char *ptr;
 106 #ifndef CONFIG_NEED_MULTIPLE_NODES
 107                 ptr = alloc_bootmem_pages(size);
 108 #else
 109                 int node = early_cpu_to_node(i);
 110                 if (!node_online(node) || !NODE_DATA(node)) {
 111                         ptr = alloc_bootmem_pages(size);
 112                         printk(KERN_INFO
 113                                "cpu %d has no node or node-local memory\n", i);
 114                 }
 115                 else
 116                         ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
 117 #endif
 118                 if (!ptr)
 119                         panic("Cannot allocate cpu data for CPU %d\n", i);
 120 #ifdef CONFIG_X86_64
 121                 cpu_pda(i)->data_offset = ptr - __per_cpu_start;
 122 #else
 123                 __per_cpu_offset[i] = ptr - __per_cpu_start;
 124 #endif
 125                 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
 126
 127                 highest_cpu = i;
 128         }
 129
 130         nr_cpu_ids = highest_cpu + 1;
 131         printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d\n", NR_CPUS, nr_cpu_ids);
 132
 133         /* Setup percpu data maps */
 134         setup_per_cpu_maps();
 135
 136         /* Setup cpumask_of_cpu map */
 137         setup_cpumask_of_cpu();
 138 }
 139
 140 #endif
 141
 142 void __init parse_setup_data(void)
 143 {
 144         struct setup_data *data;
 145         u64 pa_data;
 146
 147         if (boot_params.hdr.version < 0x0209)
 148                 return;
 149         pa_data = boot_params.hdr.setup_data;
 150         while (pa_data) {
 151                 data = early_ioremap(pa_data, PAGE_SIZE);
 152                 switch (data->type) {
 153                 default:
 154                         break;
 155                 }
 156 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 157                 free_early(pa_data, pa_data+sizeof(*data)+data->len);
 158 #endif
 159                 pa_data = data->next;
 160                 early_iounmap(data, PAGE_SIZE);
 161         }
 162 }