1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_MICROCODE_H
3#define _ASM_X86_MICROCODE_H
4
5#include <asm/msr.h>
6
7struct cpu_signature {
8 unsigned int sig;
9 unsigned int pf;
10 unsigned int rev;
11};
12
13struct ucode_cpu_info {
14 struct cpu_signature cpu_sig;
15 void *mc;
16};
17
18#ifdef CONFIG_MICROCODE
19void load_ucode_bsp(void);
20void load_ucode_ap(void);
21void microcode_bsp_resume(void);
22bool __init microcode_loader_disabled(void);
23#else
24static inline void load_ucode_bsp(void) { }
25static inline void load_ucode_ap(void) { }
26static inline void microcode_bsp_resume(void) { }
27static inline bool __init microcode_loader_disabled(void) { return false; }
28#endif
29
30extern unsigned long initrd_start_early;
31
32#ifdef CONFIG_CPU_SUP_INTEL
33/* Intel specific microcode defines. Public for IFS */
34struct microcode_header_intel {
35 unsigned int hdrver;
36 unsigned int rev;
37 unsigned int date;
38 unsigned int sig;
39 unsigned int cksum;
40 unsigned int ldrver;
41 unsigned int pf;
42 unsigned int datasize;
43 unsigned int totalsize;
44 unsigned int metasize;
45 unsigned int min_req_ver;
46 unsigned int reserved;
47};
48
49struct microcode_intel {
50 struct microcode_header_intel hdr;
51 unsigned int bits[];
52};
53
54#define DEFAULT_UCODE_DATASIZE (2000)
55#define MC_HEADER_SIZE (sizeof(struct microcode_header_intel))
56#define MC_HEADER_TYPE_MICROCODE 1
57#define MC_HEADER_TYPE_IFS 2
58
59static inline int intel_microcode_get_datasize(struct microcode_header_intel *hdr)
60{
61 return hdr->datasize ? : DEFAULT_UCODE_DATASIZE;
62}
63
64static inline u32 intel_get_microcode_revision(void)
65{
66 u32 rev, dummy;
67
68 native_wrmsrq(MSR_IA32_UCODE_REV, 0);
69
70 /* As documented in the SDM: Do a CPUID 1 here */
71 native_cpuid_eax(op: 1);
72
73 /* get the current revision from MSR 0x8B */
74 native_rdmsr(MSR_IA32_UCODE_REV, dummy, rev);
75
76 return rev;
77}
78#endif /* !CONFIG_CPU_SUP_INTEL */
79
80bool microcode_nmi_handler(void);
81void microcode_offline_nmi_handler(void);
82
83#ifdef CONFIG_MICROCODE_LATE_LOADING
84DECLARE_STATIC_KEY_FALSE(microcode_nmi_handler_enable);
85static __always_inline bool microcode_nmi_handler_enabled(void)
86{
87 return static_branch_unlikely(&microcode_nmi_handler_enable);
88}
89#else
90static __always_inline bool microcode_nmi_handler_enabled(void) { return false; }
91#endif
92
93#endif /* _ASM_X86_MICROCODE_H */
94

source code of linux/arch/x86/include/asm/microcode.h