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1#ifndef _ASM_X86_MICROCODE_H
2#define _ASM_X86_MICROCODE_H
3
4#include <asm/cpu.h>
5#include <linux/earlycpio.h>
6#include <linux/initrd.h>
7
8#define native_rdmsr(msr, val1, val2) \
9do { \
10 u64 __val = __rdmsr((msr)); \
11 (void)((val1) = (u32)__val); \
12 (void)((val2) = (u32)(__val >> 32)); \
13} while (0)
14
15#define native_wrmsr(msr, low, high) \
16 __wrmsr(msr, low, high)
17
18#define native_wrmsrl(msr, val) \
19 __wrmsr((msr), (u32)((u64)(val)), \
20 (u32)((u64)(val) >> 32))
21
22struct ucode_patch {
23 struct list_head plist;
24 void *data; /* Intel uses only this one */
25 u32 patch_id;
26 u16 equiv_cpu;
27};
28
29extern struct list_head microcode_cache;
30
31struct cpu_signature {
32 unsigned int sig;
33 unsigned int pf;
34 unsigned int rev;
35};
36
37struct device;
38
39enum ucode_state { UCODE_ERROR, UCODE_OK, UCODE_NFOUND };
40
41struct microcode_ops {
42 enum ucode_state (*request_microcode_user) (int cpu,
43 const void __user *buf, size_t size);
44
45 enum ucode_state (*request_microcode_fw) (int cpu, struct device *,
46 bool refresh_fw);
47
48 void (*microcode_fini_cpu) (int cpu);
49
50 /*
51 * The generic 'microcode_core' part guarantees that
52 * the callbacks below run on a target cpu when they
53 * are being called.
54 * See also the "Synchronization" section in microcode_core.c.
55 */
56 int (*apply_microcode) (int cpu);
57 int (*collect_cpu_info) (int cpu, struct cpu_signature *csig);
58};
59
60struct ucode_cpu_info {
61 struct cpu_signature cpu_sig;
62 int valid;
63 void *mc;
64};
65extern struct ucode_cpu_info ucode_cpu_info[];
66struct cpio_data find_microcode_in_initrd(const char *path, bool use_pa);
67
68#ifdef CONFIG_MICROCODE_INTEL
69extern struct microcode_ops * __init init_intel_microcode(void);
70#else
71static inline struct microcode_ops * __init init_intel_microcode(void)
72{
73 return NULL;
74}
75#endif /* CONFIG_MICROCODE_INTEL */
76
77#ifdef CONFIG_MICROCODE_AMD
78extern struct microcode_ops * __init init_amd_microcode(void);
79extern void __exit exit_amd_microcode(void);
80#else
81static inline struct microcode_ops * __init init_amd_microcode(void)
82{
83 return NULL;
84}
85static inline void __exit exit_amd_microcode(void) {}
86#endif
87
88#define MAX_UCODE_COUNT 128
89
90#define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
91#define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u')
92#define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I')
93#define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l')
94#define CPUID_AMD1 QCHAR('A', 'u', 't', 'h')
95#define CPUID_AMD2 QCHAR('e', 'n', 't', 'i')
96#define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D')
97
98#define CPUID_IS(a, b, c, ebx, ecx, edx) \
99 (!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c))))
100
101/*
102 * In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
103 * x86_cpuid_vendor() gets vendor id for BSP.
104 *
105 * In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
106 * coding, we still use x86_cpuid_vendor() to get vendor id for AP.
107 *
108 * x86_cpuid_vendor() gets vendor information directly from CPUID.
109 */
110static inline int x86_cpuid_vendor(void)
111{
112 u32 eax = 0x00000000;
113 u32 ebx, ecx = 0, edx;
114
115 native_cpuid(&eax, &ebx, &ecx, &edx);
116
117 if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx))
118 return X86_VENDOR_INTEL;
119
120 if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx))
121 return X86_VENDOR_AMD;
122
123 return X86_VENDOR_UNKNOWN;
124}
125
126static inline unsigned int x86_cpuid_family(void)
127{
128 u32 eax = 0x00000001;
129 u32 ebx, ecx = 0, edx;
130
131 native_cpuid(&eax, &ebx, &ecx, &edx);
132
133 return x86_family(eax);
134}
135
136#ifdef CONFIG_MICROCODE
137int __init microcode_init(void);
138extern void __init load_ucode_bsp(void);
139extern void load_ucode_ap(void);
140void reload_early_microcode(void);
141extern bool get_builtin_firmware(struct cpio_data *cd, const char *name);
142extern bool initrd_gone;
143#else
144static inline int __init microcode_init(void) { return 0; };
145static inline void __init load_ucode_bsp(void) { }
146static inline void load_ucode_ap(void) { }
147static inline void reload_early_microcode(void) { }
148static inline bool
149get_builtin_firmware(struct cpio_data *cd, const char *name) { return false; }
150#endif
151
152#endif /* _ASM_X86_MICROCODE_H */