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);
20#else
21static inline void load_ucode_bsp(void) { }
22static inline void load_ucode_ap(void) { }
23static inline void microcode_bsp_resume(void) { }
24#endif
25
26extern unsigned long initrd_start_early;
27
28#ifdef CONFIG_CPU_SUP_INTEL
29/* Intel specific microcode defines. Public for IFS */
30struct 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
45struct 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
55static inline int intel_microcode_get_datasize(struct microcode_header_intel *hdr)
56{
57 return hdr->datasize ? : DEFAULT_UCODE_DATASIZE;
58}
59
60static 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(op: 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
76bool microcode_nmi_handler(void);
77void microcode_offline_nmi_handler(void);
78
79#ifdef CONFIG_MICROCODE_LATE_LOADING
80DECLARE_STATIC_KEY_FALSE(microcode_nmi_handler_enable);
81static __always_inline bool microcode_nmi_handler_enabled(void)
82{
83 return static_branch_unlikely(&microcode_nmi_handler_enable);
84}
85#else
86static __always_inline bool microcode_nmi_handler_enabled(void) { return false; }
87#endif
88
89#endif /* _ASM_X86_MICROCODE_H */
90

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