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