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 */
17 extern struct list_head microcode_cache;
19 struct cpu_signature {
35 struct microcode_ops {
36 enum ucode_state (*request_microcode_user) (int cpu,
37 const void __user *buf, size_t size);
39 enum ucode_state (*request_microcode_fw) (int cpu, struct device *,
42 void (*microcode_fini_cpu) (int cpu);
45 * The generic 'microcode_core' part guarantees that
46 * the callbacks below run on a target cpu when they
48 * See also the "Synchronization" section in microcode_core.c.
50 enum ucode_state (*apply_microcode) (int cpu);
51 int (*collect_cpu_info) (int cpu, struct cpu_signature *csig);
54 struct ucode_cpu_info {
55 struct cpu_signature cpu_sig;
59 extern struct ucode_cpu_info ucode_cpu_info[];
60 struct cpio_data find_microcode_in_initrd(const char *path, bool use_pa);
62 #ifdef CONFIG_MICROCODE_INTEL
63 extern struct microcode_ops * __init init_intel_microcode(void);
65 static inline struct microcode_ops * __init init_intel_microcode(void)
69 #endif /* CONFIG_MICROCODE_INTEL */
71 #ifdef CONFIG_MICROCODE_AMD
72 extern struct microcode_ops * __init init_amd_microcode(void);
73 extern void __exit exit_amd_microcode(void);
75 static inline struct microcode_ops * __init init_amd_microcode(void)
79 static inline void __exit exit_amd_microcode(void) {}
82 #define MAX_UCODE_COUNT 128
84 #define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
85 #define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u')
86 #define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I')
87 #define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l')
88 #define CPUID_AMD1 QCHAR('A', 'u', 't', 'h')
89 #define CPUID_AMD2 QCHAR('e', 'n', 't', 'i')
90 #define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D')
92 #define CPUID_IS(a, b, c, ebx, ecx, edx) \
93 (!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c))))
96 * In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
97 * x86_cpuid_vendor() gets vendor id for BSP.
99 * In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
100 * coding, we still use x86_cpuid_vendor() to get vendor id for AP.
102 * x86_cpuid_vendor() gets vendor information directly from CPUID.
104 static inline int x86_cpuid_vendor(void)
106 u32 eax = 0x00000000;
107 u32 ebx, ecx = 0, edx;
109 native_cpuid(&eax, &ebx, &ecx, &edx);
111 if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx))
112 return X86_VENDOR_INTEL;
114 if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx))
115 return X86_VENDOR_AMD;
117 return X86_VENDOR_UNKNOWN;
120 static inline unsigned int x86_cpuid_family(void)
122 u32 eax = 0x00000001;
123 u32 ebx, ecx = 0, edx;
125 native_cpuid(&eax, &ebx, &ecx, &edx);
127 return x86_family(eax);
130 #ifdef CONFIG_MICROCODE
131 int __init microcode_init(void);
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 int __init microcode_init(void) { return 0; };
140 static inline void __init load_ucode_bsp(void) { }
141 static inline void load_ucode_ap(void) { }
142 static inline void reload_early_microcode(unsigned int cpu) { }
143 static inline void microcode_bsp_resume(void) { }
145 get_builtin_firmware(struct cpio_data *cd, const char *name) { return false; }
148 #endif /* _ASM_X86_MICROCODE_H */