summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/microcode.h
blob: 9d3a96c4da789230f9aeb523e6af35e4fe4a8db3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
#ifndef _ASM_X86_MICROCODE_H
#define _ASM_X86_MICROCODE_H

#include <asm/cpu.h>
#include <linux/earlycpio.h>
#include <linux/initrd.h>

#define native_rdmsr(msr, val1, val2)			\
do {							\
	u64 __val = native_read_msr((msr));		\
	(void)((val1) = (u32)__val);			\
	(void)((val2) = (u32)(__val >> 32));		\
} while (0)

#define native_wrmsr(msr, low, high)			\
	native_write_msr(msr, low, high)

#define native_wrmsrl(msr, val)				\
	native_write_msr((msr),				\
			 (u32)((u64)(val)),		\
			 (u32)((u64)(val) >> 32))

struct cpu_signature {
	unsigned int sig;
	unsigned int pf;
	unsigned int rev;
};

struct device;

enum ucode_state { UCODE_ERROR, UCODE_OK, UCODE_NFOUND };

struct microcode_ops {
	enum ucode_state (*request_microcode_user) (int cpu,
				const void __user *buf, size_t size);

	enum ucode_state (*request_microcode_fw) (int cpu, struct device *,
						  bool refresh_fw);

	void (*microcode_fini_cpu) (int cpu);

	/*
	 * The generic 'microcode_core' part guarantees that
	 * the callbacks below run on a target cpu when they
	 * are being called.
	 * See also the "Synchronization" section in microcode_core.c.
	 */
	int (*apply_microcode) (int cpu);
	int (*collect_cpu_info) (int cpu, struct cpu_signature *csig);
};

struct ucode_cpu_info {
	struct cpu_signature	cpu_sig;
	int			valid;
	void			*mc;
};
extern struct ucode_cpu_info ucode_cpu_info[];

#ifdef CONFIG_MICROCODE
int __init microcode_init(void);
#else
static inline int __init microcode_init(void)	{ return 0; };
#endif

#ifdef CONFIG_MICROCODE_INTEL
extern struct microcode_ops * __init init_intel_microcode(void);
#else
static inline struct microcode_ops * __init init_intel_microcode(void)
{
	return NULL;
}
#endif /* CONFIG_MICROCODE_INTEL */

#ifdef CONFIG_MICROCODE_AMD
extern struct microcode_ops * __init init_amd_microcode(void);
extern void __exit exit_amd_microcode(void);
#else
static inline struct microcode_ops * __init init_amd_microcode(void)
{
	return NULL;
}
static inline void __exit exit_amd_microcode(void) {}
#endif

#define MAX_UCODE_COUNT 128

#define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
#define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u')
#define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I')
#define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l')
#define CPUID_AMD1 QCHAR('A', 'u', 't', 'h')
#define CPUID_AMD2 QCHAR('e', 'n', 't', 'i')
#define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D')

#define CPUID_IS(a, b, c, ebx, ecx, edx)	\
		(!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c))))

/*
 * In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
 * x86_cpuid_vendor() gets vendor id for BSP.
 *
 * In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
 * coding, we still use x86_cpuid_vendor() to get vendor id for AP.
 *
 * x86_cpuid_vendor() gets vendor information directly from CPUID.
 */
static inline int x86_cpuid_vendor(void)
{
	u32 eax = 0x00000000;
	u32 ebx, ecx = 0, edx;

	native_cpuid(&eax, &ebx, &ecx, &edx);

	if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx))
		return X86_VENDOR_INTEL;

	if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx))
		return X86_VENDOR_AMD;

	return X86_VENDOR_UNKNOWN;
}

static inline unsigned int x86_cpuid_family(void)
{
	u32 eax = 0x00000001;
	u32 ebx, ecx = 0, edx;

	native_cpuid(&eax, &ebx, &ecx, &edx);

	return x86_family(eax);
}

#ifdef CONFIG_MICROCODE
extern void __init load_ucode_bsp(void);
extern void load_ucode_ap(void);
extern int __init save_microcode_in_initrd(void);
void reload_early_microcode(void);
extern bool get_builtin_firmware(struct cpio_data *cd, const char *name);
#else
static inline void __init load_ucode_bsp(void)			{ }
static inline void load_ucode_ap(void)				{ }
static inline int __init save_microcode_in_initrd(void)		{ return 0; }
static inline void reload_early_microcode(void)			{ }
static inline bool
get_builtin_firmware(struct cpio_data *cd, const char *name)	{ return false; }
#endif

static inline unsigned long get_initrd_start(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
	return initrd_start;
#else
	return 0;
#endif
}

static inline unsigned long get_initrd_start_addr(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
#ifdef CONFIG_X86_32
	unsigned long *initrd_start_p = (unsigned long *)__pa_nodebug(&initrd_start);

	return (unsigned long)__pa_nodebug(*initrd_start_p);
#else
	return get_initrd_start();
#endif
#else /* CONFIG_BLK_DEV_INITRD */
	return 0;
#endif
}

#endif /* _ASM_X86_MICROCODE_H */