1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_MICROCODE_H
3 #define _ASM_X86_MICROCODE_H
6 #include <linux/earlycpio.h>
7 #include <linux/initrd.h>
8 #include <asm/microcode_amd.h>
11 struct list_head plist;
12 void *data; /* Intel uses only this one */
18 extern struct list_head microcode_cache;
20 struct cpu_signature {
36 struct microcode_ops {
37 enum ucode_state (*request_microcode_user) (int cpu,
38 const void __user *buf, size_t size);
40 enum ucode_state (*request_microcode_fw) (int cpu, struct device *,
43 void (*microcode_fini_cpu) (int cpu);
46 * The generic 'microcode_core' part guarantees that
47 * the callbacks below run on a target cpu when they
49 * See also the "Synchronization" section in microcode_core.c.
51 enum ucode_state (*apply_microcode) (int cpu);
52 int (*collect_cpu_info) (int cpu, struct cpu_signature *csig);
55 struct ucode_cpu_info {
56 struct cpu_signature cpu_sig;
60 extern struct ucode_cpu_info ucode_cpu_info[];
61 struct cpio_data find_microcode_in_initrd(const char *path, bool use_pa);
63 #ifdef CONFIG_MICROCODE_INTEL
64 extern struct microcode_ops * __init init_intel_microcode(void);
66 static inline struct microcode_ops * __init init_intel_microcode(void)
70 #endif /* CONFIG_MICROCODE_INTEL */
72 #ifdef CONFIG_MICROCODE_AMD
73 extern struct microcode_ops * __init init_amd_microcode(void);
74 extern void __exit exit_amd_microcode(void);
76 static inline struct microcode_ops * __init init_amd_microcode(void)
80 static inline void __exit exit_amd_microcode(void) {}
83 #define MAX_UCODE_COUNT 128
85 #define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
86 #define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u')
87 #define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I')
88 #define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l')
89 #define CPUID_AMD1 QCHAR('A', 'u', 't', 'h')
90 #define CPUID_AMD2 QCHAR('e', 'n', 't', 'i')
91 #define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D')
93 #define CPUID_IS(a, b, c, ebx, ecx, edx) \
94 (!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c))))
97 * In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
98 * x86_cpuid_vendor() gets vendor id for BSP.
100 * In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
101 * coding, we still use x86_cpuid_vendor() to get vendor id for AP.
103 * x86_cpuid_vendor() gets vendor information directly from CPUID.
105 static inline int x86_cpuid_vendor(void)
107 u32 eax = 0x00000000;
108 u32 ebx, ecx = 0, edx;
110 native_cpuid(&eax, &ebx, &ecx, &edx);
112 if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx))
113 return X86_VENDOR_INTEL;
115 if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx))
116 return X86_VENDOR_AMD;
118 return X86_VENDOR_UNKNOWN;
121 static inline unsigned int x86_cpuid_family(void)
123 u32 eax = 0x00000001;
124 u32 ebx, ecx = 0, edx;
126 native_cpuid(&eax, &ebx, &ecx, &edx);
128 return x86_family(eax);
131 #ifdef CONFIG_MICROCODE
132 extern void __init load_ucode_bsp(void);
133 extern void load_ucode_ap(void);
134 void reload_early_microcode(unsigned int cpu);
135 extern bool get_builtin_firmware(struct cpio_data *cd, const char *name);
136 extern bool initrd_gone;
137 void microcode_bsp_resume(void);
139 static inline void __init load_ucode_bsp(void) { }
140 static inline void load_ucode_ap(void) { }
141 static inline void reload_early_microcode(unsigned int cpu) { }
142 static inline void microcode_bsp_resume(void) { }
144 get_builtin_firmware(struct cpio_data *cd, const char *name) { return false; }
147 #endif /* _ASM_X86_MICROCODE_H */