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 <linux/kvm_types.h> 8 #include <asm/apic.h> 9 10 #include "local.h" 11 12 u32 apic_default_calc_apicid(unsigned int cpu) 13 { 14 return per_cpu(x86_cpu_to_apicid, cpu); 15 } 16 17 u32 apic_flat_calc_apicid(unsigned int cpu) 18 { 19 return 1U << cpu; 20 } 21 22 u32 default_cpu_present_to_apicid(int mps_cpu) 23 { 24 if (mps_cpu < nr_cpu_ids && cpu_present(mps_cpu)) 25 return (int)per_cpu(x86_cpu_to_apicid, mps_cpu); 26 else 27 return BAD_APICID; 28 } 29 EXPORT_SYMBOL_FOR_KVM(default_cpu_present_to_apicid); 30 31 /* 32 * Set up the logical destination ID when the APIC operates in logical 33 * destination mode. 34 */ 35 void default_init_apic_ldr(void) 36 { 37 unsigned long val; 38 39 apic_write(APIC_DFR, APIC_DFR_FLAT); 40 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; 41 val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); 42 apic_write(APIC_LDR, val); 43 } 44