1/*
2 * Common functions shared between the various APIC flavours
3 *
4 * SPDX-License-Identifier: GPL-2.0
5 */
6#include <linux/irq.h>
7#include <asm/apic.h>
8
9#include "local.h"
10
11u32 apic_default_calc_apicid(unsigned int cpu)
12{
13 return per_cpu(x86_cpu_to_apicid, cpu);
14}
15
16u32 apic_flat_calc_apicid(unsigned int cpu)
17{
18 return 1U << cpu;
19}
20
21u32 default_cpu_present_to_apicid(int mps_cpu)
22{
23 if (mps_cpu < nr_cpu_ids && cpu_present(cpu: mps_cpu))
24 return (int)per_cpu(x86_cpu_to_apicid, mps_cpu);
25 else
26 return BAD_APICID;
27}
28EXPORT_SYMBOL_GPL(default_cpu_present_to_apicid);
29
30/*
31 * Set up the logical destination ID when the APIC operates in logical
32 * destination mode.
33 */
34void default_init_apic_ldr(void)
35{
36 unsigned long val;
37
38 apic_write(APIC_DFR, APIC_DFR_FLAT);
39 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
40 val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
41 apic_write(APIC_LDR, val);
42}
43