Linux kernel mirror (for testing)
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linux
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 = native_read_msr((msr)); \
11 (void)((val1) = (u32)__val); \
12 (void)((val2) = (u32)(__val >> 32)); \
13} while (0)
14
15#define native_wrmsr(msr, low, high) \
16 native_write_msr(msr, low, high)
17
18#define native_wrmsrl(msr, val) \
19 native_write_msr((msr), \
20 (u32)((u64)(val)), \
21 (u32)((u64)(val) >> 32))
22
23struct cpu_signature {
24 unsigned int sig;
25 unsigned int pf;
26 unsigned int rev;
27};
28
29struct device;
30
31enum ucode_state { UCODE_ERROR, UCODE_OK, UCODE_NFOUND };
32
33struct microcode_ops {
34 enum ucode_state (*request_microcode_user) (int cpu,
35 const void __user *buf, size_t size);
36
37 enum ucode_state (*request_microcode_fw) (int cpu, struct device *,
38 bool refresh_fw);
39
40 void (*microcode_fini_cpu) (int cpu);
41
42 /*
43 * The generic 'microcode_core' part guarantees that
44 * the callbacks below run on a target cpu when they
45 * are being called.
46 * See also the "Synchronization" section in microcode_core.c.
47 */
48 int (*apply_microcode) (int cpu);
49 int (*collect_cpu_info) (int cpu, struct cpu_signature *csig);
50};
51
52struct ucode_cpu_info {
53 struct cpu_signature cpu_sig;
54 int valid;
55 void *mc;
56};
57extern struct ucode_cpu_info ucode_cpu_info[];
58
59#ifdef CONFIG_MICROCODE
60int __init microcode_init(void);
61#else
62static inline int __init microcode_init(void) { return 0; };
63#endif
64
65#ifdef CONFIG_MICROCODE_INTEL
66extern struct microcode_ops * __init init_intel_microcode(void);
67#else
68static inline struct microcode_ops * __init init_intel_microcode(void)
69{
70 return NULL;
71}
72#endif /* CONFIG_MICROCODE_INTEL */
73
74#ifdef CONFIG_MICROCODE_AMD
75extern struct microcode_ops * __init init_amd_microcode(void);
76extern void __exit exit_amd_microcode(void);
77#else
78static inline struct microcode_ops * __init init_amd_microcode(void)
79{
80 return NULL;
81}
82static inline void __exit exit_amd_microcode(void) {}
83#endif
84
85#define MAX_UCODE_COUNT 128
86
87#define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
88#define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u')
89#define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I')
90#define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l')
91#define CPUID_AMD1 QCHAR('A', 'u', 't', 'h')
92#define CPUID_AMD2 QCHAR('e', 'n', 't', 'i')
93#define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D')
94
95#define CPUID_IS(a, b, c, ebx, ecx, edx) \
96 (!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c))))
97
98/*
99 * In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
100 * x86_cpuid_vendor() gets vendor id for BSP.
101 *
102 * In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
103 * coding, we still use x86_cpuid_vendor() to get vendor id for AP.
104 *
105 * x86_cpuid_vendor() gets vendor information directly from CPUID.
106 */
107static inline int x86_cpuid_vendor(void)
108{
109 u32 eax = 0x00000000;
110 u32 ebx, ecx = 0, edx;
111
112 native_cpuid(&eax, &ebx, &ecx, &edx);
113
114 if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx))
115 return X86_VENDOR_INTEL;
116
117 if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx))
118 return X86_VENDOR_AMD;
119
120 return X86_VENDOR_UNKNOWN;
121}
122
123static inline unsigned int x86_cpuid_family(void)
124{
125 u32 eax = 0x00000001;
126 u32 ebx, ecx = 0, edx;
127
128 native_cpuid(&eax, &ebx, &ecx, &edx);
129
130 return x86_family(eax);
131}
132
133#ifdef CONFIG_MICROCODE
134extern void __init load_ucode_bsp(void);
135extern void load_ucode_ap(void);
136extern int __init save_microcode_in_initrd(void);
137void reload_early_microcode(void);
138extern bool get_builtin_firmware(struct cpio_data *cd, const char *name);
139#else
140static inline void __init load_ucode_bsp(void) { }
141static inline void load_ucode_ap(void) { }
142static inline int __init save_microcode_in_initrd(void) { return 0; }
143static inline void reload_early_microcode(void) { }
144static inline bool
145get_builtin_firmware(struct cpio_data *cd, const char *name) { return false; }
146#endif
147
148static inline unsigned long get_initrd_start(void)
149{
150#ifdef CONFIG_BLK_DEV_INITRD
151 return initrd_start;
152#else
153 return 0;
154#endif
155}
156
157static inline unsigned long get_initrd_start_addr(void)
158{
159#ifdef CONFIG_BLK_DEV_INITRD
160#ifdef CONFIG_X86_32
161 unsigned long *initrd_start_p = (unsigned long *)__pa_nodebug(&initrd_start);
162
163 return (unsigned long)__pa_nodebug(*initrd_start_p);
164#else
165 return get_initrd_start();
166#endif
167#else /* CONFIG_BLK_DEV_INITRD */
168 return 0;
169#endif
170}
171
172#endif /* _ASM_X86_MICROCODE_H */