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145 lines
3.8 KiB
C
145 lines
3.8 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 <linux/kexec.h>
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#include <linux/crash_dump.h>
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#include <linux/smp.h>
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#include <linux/topology.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/mpspec.h>
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#include <asm/apicdef.h>
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#include <asm/highmem.h>
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#include <asm/proto.h>
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#include <asm/cpumask.h>
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#include <asm/cpu.h>
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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# define DBG(x...) printk(KERN_DEBUG x)
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#else
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# define DBG(x...)
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#endif
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DEFINE_PER_CPU(int, cpu_number);
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EXPORT_PER_CPU_SYMBOL(cpu_number);
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#ifdef CONFIG_X86_64
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#define BOOT_PERCPU_OFFSET ((unsigned long)__per_cpu_load)
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#else
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#define BOOT_PERCPU_OFFSET 0
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#endif
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DEFINE_PER_CPU(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET;
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EXPORT_PER_CPU_SYMBOL(this_cpu_off);
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unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = {
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[0 ... NR_CPUS-1] = BOOT_PERCPU_OFFSET,
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};
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EXPORT_SYMBOL(__per_cpu_offset);
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static inline void setup_percpu_segment(int cpu)
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{
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#ifdef CONFIG_X86_32
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struct desc_struct gdt;
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pack_descriptor(&gdt, per_cpu_offset(cpu), 0xFFFFF,
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0x2 | DESCTYPE_S, 0x8);
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gdt.s = 1;
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write_gdt_entry(get_cpu_gdt_table(cpu),
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GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S);
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#endif
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}
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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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ssize_t size;
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char *ptr;
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int cpu;
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/* Copy section for each CPU (we discard the original) */
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size = roundup(PERCPU_ENOUGH_ROOM, PAGE_SIZE);
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pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
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NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);
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pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size);
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for_each_possible_cpu(cpu) {
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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(cpu);
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if (!node_online(node) || !NODE_DATA(node)) {
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ptr = alloc_bootmem_pages(size);
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pr_info("cpu %d has no node %d or node-local memory\n",
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cpu, node);
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pr_debug("per cpu data for cpu%d at %016lx\n",
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cpu, __pa(ptr));
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} else {
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ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
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pr_debug("per cpu data for cpu%d on node%d at %016lx\n",
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cpu, node, __pa(ptr));
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}
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#endif
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memcpy(ptr, __per_cpu_load, __per_cpu_end - __per_cpu_start);
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per_cpu_offset(cpu) = ptr - __per_cpu_start;
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per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
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per_cpu(cpu_number, cpu) = cpu;
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setup_percpu_segment(cpu);
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/*
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* Copy data used in early init routines from the
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* initial arrays to the per cpu data areas. These
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* arrays then become expendable and the *_early_ptr's
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* are zeroed indicating that the static arrays are
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* gone.
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*/
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#ifdef CONFIG_X86_LOCAL_APIC
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per_cpu(x86_cpu_to_apicid, cpu) =
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early_per_cpu_map(x86_cpu_to_apicid, cpu);
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per_cpu(x86_bios_cpu_apicid, cpu) =
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early_per_cpu_map(x86_bios_cpu_apicid, cpu);
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#endif
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#ifdef CONFIG_X86_64
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per_cpu(irq_stack_ptr, cpu) =
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per_cpu(irq_stack_union.irq_stack, cpu) +
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IRQ_STACK_SIZE - 64;
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#ifdef CONFIG_NUMA
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per_cpu(x86_cpu_to_node_map, cpu) =
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early_per_cpu_map(x86_cpu_to_node_map, cpu);
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#endif
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#endif
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/*
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* Up to this point, the boot CPU has been using .data.init
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* area. Reload any changed state for the boot CPU.
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*/
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if (cpu == boot_cpu_id)
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switch_to_new_gdt();
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DBG("PERCPU: cpu %4d %p\n", cpu, ptr);
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}
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/* indicate the early static arrays will soon be gone */
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#ifdef CONFIG_X86_LOCAL_APIC
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early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
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early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
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#endif
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#if defined(CONFIG_X86_64) && defined(CONFIG_NUMA)
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early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
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#endif
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/* Setup node to cpumask map */
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setup_node_to_cpumask_map();
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/* Setup cpu initialized, callin, callout masks */
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setup_cpu_local_masks();
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}
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