microcode.h

 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(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 */