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review.coreboot.org / coreboot / 699b1c4a66084049531bc59a392052b4251da1e0 / . / src / arch / x86 / include / arch / cpuid.h
blob: b2780bec472c79c85e7f8c2d24c344f9b56abddf [file] [log] [blame]
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]1/* SPDX-License-Identifier: GPL-2.0-only */
2
3#ifndef ARCH_CPUID_H
4#define ARCH_CPUID_H
5
6#include <types.h>
7
8struct cpuid_result {
9 uint32_t eax;
10 uint32_t ebx;
11 uint32_t ecx;
12 uint32_t edx;
13};
14
15/*
16 * Generic CPUID function
17 */
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]18static inline struct cpuid_result cpuid(const uint32_t eax)
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]19{
20 struct cpuid_result result;
21 asm volatile(
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]22 "cpuid;"
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]23 : "=a" (result.eax),
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]24 "=b" (result.ebx),
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]25 "=c" (result.ecx),
26 "=d" (result.edx)
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]27 : "a" (eax));
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]28 return result;
29}
30
31/*
32 * Generic Extended CPUID function
33 */
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]34static inline struct cpuid_result cpuid_ext(const uint32_t eax, const uint32_t ecx)
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]35{
36 struct cpuid_result result;
37 asm volatile(
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]38 "cpuid;"
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]39 : "=a" (result.eax),
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]40 "=b" (result.ebx),
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]41 "=c" (result.ecx),
42 "=d" (result.edx)
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]43 : "a" (eax), "c" (ecx));
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]44 return result;
45}
46
47/*
48 * CPUID functions returning a single datum
49 */
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]50static inline uint32_t cpuid_eax(uint32_t eax)
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]51{
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]52 asm volatile(
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]53 "cpuid;"
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]54 : "+a" (eax)
55 :: "ebx", "ecx", "edx");
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]56 return eax;
57}
58
Patrick Rudolph699b1c42023-09-30 15:12:17 +0200[diff] [blame^]59static inline uint32_t cpuid_ebx(uint32_t eax)
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]60{
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]61 uint32_t ebx;
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]62
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]63 asm volatile(
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]64 "cpuid;"
Patrick Rudolph699b1c42023-09-30 15:12:17 +0200[diff] [blame^]65 : "=b" (ebx), "+a" (eax)
66 :: "ecx", "edx");
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]67 return ebx;
68}
69
Patrick Rudolph699b1c42023-09-30 15:12:17 +0200[diff] [blame^]70static inline uint32_t cpuid_ecx(uint32_t eax)
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]71{
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]72 uint32_t ecx;
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]73
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]74 asm volatile(
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]75 "cpuid;"
Patrick Rudolph699b1c42023-09-30 15:12:17 +0200[diff] [blame^]76 : "=c" (ecx), "+a" (eax)
77 :: "ebx", "edx");
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]78 return ecx;
79}
80
Patrick Rudolph699b1c42023-09-30 15:12:17 +0200[diff] [blame^]81static inline uint32_t cpuid_edx(uint32_t eax)
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]82{
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]83 uint32_t edx;
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]84
Matei Dibu516eff02022-08-02 00:48:59 +0300[diff] [blame]85 asm volatile(
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]86 "cpuid;"
Patrick Rudolph699b1c42023-09-30 15:12:17 +0200[diff] [blame^]87 : "=d" (edx), "+a" (eax)
88 :: "ebx", "ecx");
Martin Roth568670f92022-09-17 15:52:36 -0600[diff] [blame]89 return edx;
90}
91
92#endif /* ARCH_CPUID_H */