3b41908902
Clean up references to x86_cpu_to_apicid. Removes extraneous comments and standardizes on "x86_*_early_ptr" for the early kernel init references. Signed-off-by: Mike Travis <travis@sgi.com> Reviewed-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/*
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* Copyright 2004 James Cleverdon, IBM.
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* Subject to the GNU Public License, v.2
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*
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* Generic APIC sub-arch probe layer.
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*
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* Hacked for x86-64 by James Cleverdon from i386 architecture code by
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* Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
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* James Cleverdon.
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*/
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/ctype.h>
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#include <linux/init.h>
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#include <asm/smp.h>
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#include <asm/ipi.h>
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#include <asm/genapic.h>
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#ifdef CONFIG_ACPI
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#include <acpi/acpi_bus.h>
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#endif
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/* which logical CPU number maps to which CPU (physical APIC ID) */
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u16 x86_cpu_to_apicid_init[NR_CPUS] __initdata
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= { [0 ... NR_CPUS-1] = BAD_APICID };
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void *x86_cpu_to_apicid_early_ptr;
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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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struct genapic __read_mostly *genapic = &apic_flat;
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/*
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* Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
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*/
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void __init setup_apic_routing(void)
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{
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#ifdef CONFIG_ACPI
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/*
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* Quirk: some x86_64 machines can only use physical APIC mode
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* regardless of how many processors are present (x86_64 ES7000
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* is an example).
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*/
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if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
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(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL))
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genapic = &apic_physflat;
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else
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#endif
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if (cpus_weight(cpu_possible_map) <= 8)
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genapic = &apic_flat;
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else
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genapic = &apic_physflat;
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printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
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}
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/* Same for both flat and physical. */
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void send_IPI_self(int vector)
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{
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__send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
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}
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