104 строки
2.5 KiB
C
104 строки
2.5 KiB
C
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#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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#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
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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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#ifdef CONFIG_SMP
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if (per_cpu_offset(cpu)) {
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#endif
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per_cpu(x86_cpu_to_apicid, cpu) =
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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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#ifdef CONFIG_SMP
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} else
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printk(KERN_NOTICE "per_cpu_offset zero for cpu %d\n",
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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_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;
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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_cpu_mask(i, cpu_possible_map) {
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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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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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}
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/* setup percpu data maps early */
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setup_per_cpu_maps();
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}
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#endif
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