Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_MICROCODE_H
3#define _ASM_X86_MICROCODE_H
4
5#include <asm/cpu.h>
6#include <linux/earlycpio.h>
7#include <linux/initrd.h>
8
9struct ucode_patch {
10 struct list_head plist;
11 void *data; /* Intel uses only this one */
12 unsigned int size;
13 u32 patch_id;
14 u16 equiv_cpu;
15};
16
17extern struct list_head microcode_cache;
18
19struct cpu_signature {
20 unsigned int sig;
21 unsigned int pf;
22 unsigned int rev;
23};
24
25struct device;
26
27enum ucode_state {
28 UCODE_OK = 0,
29 UCODE_NEW,
30 UCODE_UPDATED,
31 UCODE_NFOUND,
32 UCODE_ERROR,
33};
34
35struct microcode_ops {
36 enum ucode_state (*request_microcode_fw) (int cpu, struct device *,
37 bool refresh_fw);
38
39 void (*microcode_fini_cpu) (int cpu);
40
41 /*
42 * The generic 'microcode_core' part guarantees that
43 * the callbacks below run on a target cpu when they
44 * are being called.
45 * See also the "Synchronization" section in microcode_core.c.
46 */
47 enum ucode_state (*apply_microcode) (int cpu);
48 int (*collect_cpu_info) (int cpu, struct cpu_signature *csig);
49};
50
51struct ucode_cpu_info {
52 struct cpu_signature cpu_sig;
53 int valid;
54 void *mc;
55};
56extern struct ucode_cpu_info ucode_cpu_info[];
57struct cpio_data find_microcode_in_initrd(const char *path, bool use_pa);
58
59#ifdef CONFIG_MICROCODE_INTEL
60extern struct microcode_ops * __init init_intel_microcode(void);
61#else
62static inline struct microcode_ops * __init init_intel_microcode(void)
63{
64 return NULL;
65}
66#endif /* CONFIG_MICROCODE_INTEL */
67
68#ifdef CONFIG_MICROCODE_AMD
69extern struct microcode_ops * __init init_amd_microcode(void);
70extern void __exit exit_amd_microcode(void);
71#else
72static inline struct microcode_ops * __init init_amd_microcode(void)
73{
74 return NULL;
75}
76static inline void __exit exit_amd_microcode(void) {}
77#endif
78
79#define MAX_UCODE_COUNT 128
80
81#define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
82#define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u')
83#define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I')
84#define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l')
85#define CPUID_AMD1 QCHAR('A', 'u', 't', 'h')
86#define CPUID_AMD2 QCHAR('e', 'n', 't', 'i')
87#define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D')
88
89#define CPUID_IS(a, b, c, ebx, ecx, edx) \
90 (!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c))))
91
92/*
93 * In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
94 * x86_cpuid_vendor() gets vendor id for BSP.
95 *
96 * In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
97 * coding, we still use x86_cpuid_vendor() to get vendor id for AP.
98 *
99 * x86_cpuid_vendor() gets vendor information directly from CPUID.
100 */
101static inline int x86_cpuid_vendor(void)
102{
103 u32 eax = 0x00000000;
104 u32 ebx, ecx = 0, edx;
105
106 native_cpuid(&eax, &ebx, &ecx, &edx);
107
108 if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx))
109 return X86_VENDOR_INTEL;
110
111 if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx))
112 return X86_VENDOR_AMD;
113
114 return X86_VENDOR_UNKNOWN;
115}
116
117static inline unsigned int x86_cpuid_family(void)
118{
119 u32 eax = 0x00000001;
120 u32 ebx, ecx = 0, edx;
121
122 native_cpuid(&eax, &ebx, &ecx, &edx);
123
124 return x86_family(eax);
125}
126
127#ifdef CONFIG_MICROCODE
128extern void __init load_ucode_bsp(void);
129extern void load_ucode_ap(void);
130void reload_early_microcode(void);
131extern bool initrd_gone;
132void microcode_bsp_resume(void);
133#else
134static inline void __init load_ucode_bsp(void) { }
135static inline void load_ucode_ap(void) { }
136static inline void reload_early_microcode(void) { }
137static inline void microcode_bsp_resume(void) { }
138#endif
139
140#endif /* _ASM_X86_MICROCODE_H */