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
apic_default_calc_apicid(unsigned int cpu)11 u32 apic_default_calc_apicid(unsigned int cpu)
12 {
13 return per_cpu(x86_cpu_to_apicid, cpu);
14 }
15
apic_flat_calc_apicid(unsigned int cpu)16 u32 apic_flat_calc_apicid(unsigned int cpu)
17 {
18 return 1U << cpu;
19 }
20
default_check_apicid_used(physid_mask_t * map,int apicid)21 bool default_check_apicid_used(physid_mask_t *map, int apicid)
22 {
23 return physid_isset(apicid, *map);
24 }
25
default_ioapic_phys_id_map(physid_mask_t * phys_map,physid_mask_t * retmap)26 void default_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
27 {
28 *retmap = *phys_map;
29 }
30
default_cpu_present_to_apicid(int mps_cpu)31 int default_cpu_present_to_apicid(int mps_cpu)
32 {
33 if (mps_cpu < nr_cpu_ids && cpu_present(mps_cpu))
34 return (int)per_cpu(x86_cpu_to_apicid, mps_cpu);
35 else
36 return BAD_APICID;
37 }
38 EXPORT_SYMBOL_GPL(default_cpu_present_to_apicid);
39
default_apic_id_registered(void)40 bool default_apic_id_registered(void)
41 {
42 return physid_isset(read_apic_id(), phys_cpu_present_map);
43 }
44
45 /*
46 * Set up the logical destination ID when the APIC operates in logical
47 * destination mode.
48 */
default_init_apic_ldr(void)49 void default_init_apic_ldr(void)
50 {
51 unsigned long val;
52
53 apic_write(APIC_DFR, APIC_DFR_FLAT);
54 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
55 val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
56 apic_write(APIC_LDR, val);
57 }
58