1 /*
2 * Copyright (c) 2022 Intel Corporation
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <cpuid.h> /* Header provided by the toolchain. */
8
9 #include <zephyr/kernel_structs.h>
10 #include <zephyr/arch/x86/cpuid.h>
11 #include <zephyr/kernel.h>
12
z_x86_cpuid_extended_features(void)13 uint32_t z_x86_cpuid_extended_features(void)
14 {
15 uint32_t eax, ebx, ecx = 0U, edx;
16
17 if (__get_cpuid(CPUID_EXTENDED_FEATURES_LVL,
18 &eax, &ebx, &ecx, &edx) == 0) {
19 return 0;
20 }
21
22 return edx;
23 }
24
25 #define INITIAL_APIC_ID_SHIFT (24)
26 #define INITIAL_APIC_ID_MASK (0xFF)
27
z_x86_cpuid_get_current_physical_apic_id(void)28 uint8_t z_x86_cpuid_get_current_physical_apic_id(void)
29 {
30 uint32_t eax, ebx, ecx, edx;
31
32 if (IS_ENABLED(CONFIG_X2APIC)) {
33 /* leaf 0x1F should be used first prior to using 0x0B */
34 if (__get_cpuid(CPUID_EXTENDED_TOPOLOGY_ENUMERATION_V2,
35 &eax, &ebx, &ecx, &edx) == 0) {
36 if (__get_cpuid(CPUID_EXTENDED_TOPOLOGY_ENUMERATION,
37 &eax, &ebx, &ecx, &edx) == 0) {
38 return 0;
39 }
40 }
41 } else {
42 if (__get_cpuid(CPUID_BASIC_INFO_1,
43 &eax, &ebx, &ecx, &edx) == 0) {
44 return 0;
45 }
46
47 edx = (ebx >> INITIAL_APIC_ID_SHIFT);
48 }
49
50 return (uint8_t)(edx & INITIAL_APIC_ID_MASK);
51 }
52
