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
9#define native_rdmsr(msr, val1, val2) \
10do { \
11 u64 __val = __rdmsr((msr)); \
12 (void)((val1) = (u32)__val); \
13 (void)((val2) = (u32)(__val >> 32)); \
14} while (0)
15
16#define native_wrmsr(msr, low, high) \
17 __wrmsr(msr, low, high)
18
19#define native_wrmsrl(msr, val) \
20 __wrmsr((msr), (u32)((u64)(val)), \
21 (u32)((u64)(val) >> 32))
22
23struct ucode_patch {
24 struct list_head plist;
25 void *data; /* Intel uses only this one */
26 u32 patch_id;
27 u16 equiv_cpu;
28};
29
30extern struct list_head microcode_cache;
31
32struct cpu_signature {
33 unsigned int sig;
34 unsigned int pf;
35 unsigned int rev;
36};
37
38struct device;
39
40enum ucode_state {
41 UCODE_OK = 0,
42 UCODE_NEW,
43 UCODE_UPDATED,
44 UCODE_NFOUND,
45 UCODE_ERROR,
46};
47
48struct microcode_ops {
49 enum ucode_state (*request_microcode_user) (int cpu,
50 const void __user *buf, size_t size);
51
52 enum ucode_state (*request_microcode_fw) (int cpu, struct device *,
53 bool refresh_fw);
54
55 void (*microcode_fini_cpu) (int cpu);
56
57 /*
58 * The generic 'microcode_core' part guarantees that
59 * the callbacks below run on a target cpu when they
60 * are being called.
61 * See also the "Synchronization" section in microcode_core.c.
62 */
63 enum ucode_state (*apply_microcode) (int cpu);
64 int (*collect_cpu_info) (int cpu, struct cpu_signature *csig);
65};
66
67struct ucode_cpu_info {
68 struct cpu_signature cpu_sig;
69 int valid;
70 void *mc;
71};
72extern struct ucode_cpu_info ucode_cpu_info[];
73struct cpio_data find_microcode_in_initrd(const char *path, bool use_pa);
74
75#ifdef CONFIG_MICROCODE_INTEL
76extern struct microcode_ops * __init init_intel_microcode(void);
77#else
78static inline struct microcode_ops * __init init_intel_microcode(void)
79{
80 return NULL;
81}
82#endif /* CONFIG_MICROCODE_INTEL */
83
84#ifdef CONFIG_MICROCODE_AMD
85extern struct microcode_ops * __init init_amd_microcode(void);
86extern void __exit exit_amd_microcode(void);
87#else
88static inline struct microcode_ops * __init init_amd_microcode(void)
89{
90 return NULL;
91}
92static inline void __exit exit_amd_microcode(void) {}
93#endif
94
95#define MAX_UCODE_COUNT 128
96
97#define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
98#define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u')
99#define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I')
100#define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l')
101#define CPUID_AMD1 QCHAR('A', 'u', 't', 'h')
102#define CPUID_AMD2 QCHAR('e', 'n', 't', 'i')
103#define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D')
104
105#define CPUID_IS(a, b, c, ebx, ecx, edx) \
106 (!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c))))
107
108/*
109 * In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
110 * x86_cpuid_vendor() gets vendor id for BSP.
111 *
112 * In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
113 * coding, we still use x86_cpuid_vendor() to get vendor id for AP.
114 *
115 * x86_cpuid_vendor() gets vendor information directly from CPUID.
116 */
117static inline int x86_cpuid_vendor(void)
118{
119 u32 eax = 0x00000000;
120 u32 ebx, ecx = 0, edx;
121
122 native_cpuid(&eax, &ebx, &ecx, &edx);
123
124 if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx))
125 return X86_VENDOR_INTEL;
126
127 if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx))
128 return X86_VENDOR_AMD;
129
130 return X86_VENDOR_UNKNOWN;
131}
132
133static inline unsigned int x86_cpuid_family(void)
134{
135 u32 eax = 0x00000001;
136 u32 ebx, ecx = 0, edx;
137
138 native_cpuid(&eax, &ebx, &ecx, &edx);
139
140 return x86_family(eax);
141}
142
143#ifdef CONFIG_MICROCODE
144int __init microcode_init(void);
145extern void __init load_ucode_bsp(void);
146extern void load_ucode_ap(void);
147void reload_early_microcode(void);
148extern bool get_builtin_firmware(struct cpio_data *cd, const char *name);
149extern bool initrd_gone;
150#else
151static inline int __init microcode_init(void) { return 0; };
152static inline void __init load_ucode_bsp(void) { }
153static inline void load_ucode_ap(void) { }
154static inline void reload_early_microcode(void) { }
155static inline bool
156get_builtin_firmware(struct cpio_data *cd, const char *name) { return false; }
157#endif
158
159#endif /* _ASM_X86_MICROCODE_H */