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