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/*
* Common functions shared between the various APIC flavours
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <linux/irq.h>
#include <asm/apic.h>
#include "local.h"
u32 apic_default_calc_apicid(unsigned int cpu)
{
return per_cpu(x86_cpu_to_apicid, cpu);
}
u32 apic_flat_calc_apicid(unsigned int cpu)
{
return 1U << cpu;
}
u32 default_cpu_present_to_apicid(int mps_cpu)
{
if (mps_cpu < nr_cpu_ids && cpu_present(mps_cpu))
return (int)per_cpu(x86_cpu_to_apicid, mps_cpu);
else
return BAD_APICID;
}
EXPORT_SYMBOL_GPL(default_cpu_present_to_apicid);
/*
* Set up the logical destination ID when the APIC operates in logical
* destination mode.
*/
void default_init_apic_ldr(void)
{
unsigned long val;
apic_write(APIC_DFR, APIC_DFR_FLAT);
val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
apic_write(APIC_LDR, val);
}
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