1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_X86_MICROCODE_INTEL_H
 3#define _ASM_X86_MICROCODE_INTEL_H
 4
 5#include <asm/microcode.h>
 6
 7struct microcode_header_intel {
 8	unsigned int            hdrver;
 9	unsigned int            rev;
10	unsigned int            date;
11	unsigned int            sig;
12	unsigned int            cksum;
13	unsigned int            ldrver;
14	unsigned int            pf;
15	unsigned int            datasize;
16	unsigned int            totalsize;
17	unsigned int            reserved[3];
18};
19
20struct microcode_intel {
21	struct microcode_header_intel hdr;
22	unsigned int            bits[0];
23};
24
25/* microcode format is extended from prescott processors */
26struct extended_signature {
27	unsigned int            sig;
28	unsigned int            pf;
29	unsigned int            cksum;
30};
31
32struct extended_sigtable {
33	unsigned int            count;
34	unsigned int            cksum;
35	unsigned int            reserved[3];
36	struct extended_signature sigs[0];
37};
38
39#define DEFAULT_UCODE_DATASIZE	(2000)
40#define MC_HEADER_SIZE		(sizeof(struct microcode_header_intel))
41#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE)
42#define EXT_HEADER_SIZE		(sizeof(struct extended_sigtable))
43#define EXT_SIGNATURE_SIZE	(sizeof(struct extended_signature))
44
45#define get_totalsize(mc) \
46	(((struct microcode_intel *)mc)->hdr.datasize ? \
47	 ((struct microcode_intel *)mc)->hdr.totalsize : \
48	 DEFAULT_UCODE_TOTALSIZE)
49
50#define get_datasize(mc) \
51	(((struct microcode_intel *)mc)->hdr.datasize ? \
52	 ((struct microcode_intel *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
53
54#define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
55
56static inline u32 intel_get_microcode_revision(void)
57{
58	u32 rev, dummy;
59
60	native_wrmsrl(MSR_IA32_UCODE_REV, 0);
61
62	/* As documented in the SDM: Do a CPUID 1 here */
63	native_cpuid_eax(1);
64
65	/* get the current revision from MSR 0x8B */
66	native_rdmsr(MSR_IA32_UCODE_REV, dummy, rev);
67
68	return rev;
69}
70
71#ifdef CONFIG_MICROCODE_INTEL
72extern void __init load_ucode_intel_bsp(void);
73extern void load_ucode_intel_ap(void);
74extern void show_ucode_info_early(void);
75extern int __init save_microcode_in_initrd_intel(void);
76void reload_ucode_intel(void);
77#else
78static inline __init void load_ucode_intel_bsp(void) {}
79static inline void load_ucode_intel_ap(void) {}
80static inline void show_ucode_info_early(void) {}
81static inline int __init save_microcode_in_initrd_intel(void) { return -EINVAL; }
82static inline void reload_ucode_intel(void) {}
83#endif
84
85#endif /* _ASM_X86_MICROCODE_INTEL_H */