140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/percpu.h>
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#include <asm/smp.h>
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#include <asm/percpu.h>
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#include <asm/sections.h>
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#include <asm/processor.h>
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#include <asm/setup.h>
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#include <asm/topology.h>
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#include <asm/mpspec.h>
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#include <asm/apicdef.h>
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#ifdef CONFIG_X86_LOCAL_APIC
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unsigned int num_processors;
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unsigned disabled_cpus __cpuinitdata;
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/* Processor that is doing the boot up */
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unsigned int boot_cpu_physical_apicid = -1U;
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EXPORT_SYMBOL(boot_cpu_physical_apicid);
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DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID;
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EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
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/* Bitmask of physically existing CPUs */
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physid_mask_t phys_cpu_present_map;
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#endif
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#if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
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/*
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* Copy data used in early init routines from the initial arrays to the
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* per cpu data areas. These arrays then become expendable and the
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* *_early_ptr's are zeroed indicating that the static arrays are gone.
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*/
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static void __init setup_per_cpu_maps(void)
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{
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int cpu;
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for_each_possible_cpu(cpu) {
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per_cpu(x86_cpu_to_apicid, cpu) = x86_cpu_to_apicid_init[cpu];
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per_cpu(x86_bios_cpu_apicid, cpu) =
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x86_bios_cpu_apicid_init[cpu];
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#ifdef CONFIG_NUMA
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per_cpu(x86_cpu_to_node_map, cpu) =
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x86_cpu_to_node_map_init[cpu];
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#endif
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}
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/* indicate the early static arrays will soon be gone */
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x86_cpu_to_apicid_early_ptr = NULL;
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x86_bios_cpu_apicid_early_ptr = NULL;
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#ifdef CONFIG_NUMA
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x86_cpu_to_node_map_early_ptr = NULL;
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#endif
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}
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#ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
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cpumask_t *cpumask_of_cpu_map __read_mostly;
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EXPORT_SYMBOL(cpumask_of_cpu_map);
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/* requires nr_cpu_ids to be initialized */
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static void __init setup_cpumask_of_cpu(void)
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{
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int i;
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/* alloc_bootmem zeroes memory */
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cpumask_of_cpu_map = alloc_bootmem_low(sizeof(cpumask_t) * nr_cpu_ids);
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for (i = 0; i < nr_cpu_ids; i++)
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cpu_set(i, cpumask_of_cpu_map[i]);
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}
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#else
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static inline void setup_cpumask_of_cpu(void) { }
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#endif
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#ifdef CONFIG_X86_32
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/*
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* Great future not-so-futuristic plan: make i386 and x86_64 do it
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* the same way
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*/
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unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
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EXPORT_SYMBOL(__per_cpu_offset);
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#endif
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/*
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* Great future plan:
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* Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
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* Always point %gs to its beginning
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*/
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void __init setup_per_cpu_areas(void)
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{
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int i, highest_cpu = 0;
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unsigned long size;
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#ifdef CONFIG_HOTPLUG_CPU
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prefill_possible_map();
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#endif
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/* Copy section for each CPU (we discard the original) */
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size = PERCPU_ENOUGH_ROOM;
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printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n",
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size);
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for_each_possible_cpu(i) {
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char *ptr;
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#ifndef CONFIG_NEED_MULTIPLE_NODES
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ptr = alloc_bootmem_pages(size);
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#else
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int node = early_cpu_to_node(i);
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if (!node_online(node) || !NODE_DATA(node)) {
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ptr = alloc_bootmem_pages(size);
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printk(KERN_INFO
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"cpu %d has no node or node-local memory\n", i);
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}
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else
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ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
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#endif
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if (!ptr)
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panic("Cannot allocate cpu data for CPU %d\n", i);
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#ifdef CONFIG_X86_64
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cpu_pda(i)->data_offset = ptr - __per_cpu_start;
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#else
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__per_cpu_offset[i] = ptr - __per_cpu_start;
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#endif
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memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
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highest_cpu = i;
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}
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nr_cpu_ids = highest_cpu + 1;
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printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d\n", NR_CPUS, nr_cpu_ids);
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/* Setup percpu data maps */
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setup_per_cpu_maps();
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/* Setup cpumask_of_cpu map */
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setup_cpumask_of_cpu();
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}
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#endif
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