| 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 | |
| 11 | u32 apic_default_calc_apicid(unsigned int cpu) |
| 12 | { |
| 13 | return per_cpu(x86_cpu_to_apicid, cpu); |
| 14 | } |
| 15 | |
| 16 | u32 apic_flat_calc_apicid(unsigned int cpu) |
| 17 | { |
| 18 | return 1U << cpu; |
| 19 | } |
| 20 | |
| 21 | u32 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 | } |
| 28 | EXPORT_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 | */ |
| 34 | void 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 |