1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_MICROCODE_H 3 #define _ASM_X86_MICROCODE_H 4 5 #include <asm/cpu.h> 6 #include <linux/earlycpio.h> 7 #include <linux/initrd.h> 8 9 #define native_rdmsr(msr, val1, val2) \ 10 do { \ 11 u64 __val = __rdmsr((msr)); \ 12 (void)((val1) = (u32)__val); \ 13 (void)((val2) = (u32)(__val >> 32)); \ 14 } while (0) 15 16 #define native_wrmsr(msr, low, high) \ 17 __wrmsr(msr, low, high) 18 19 #define native_wrmsrl(msr, val) \ 20 __wrmsr((msr), (u32)((u64)(val)), \ 21 (u32)((u64)(val) >> 32)) 22 23 struct ucode_patch { 24 struct list_head plist; 25 void *data; /* Intel uses only this one */ 26 u32 patch_id; 27 u16 equiv_cpu; 28 }; 29 30 extern struct list_head microcode_cache; 31 32 struct cpu_signature { 33 unsigned int sig; 34 unsigned int pf; 35 unsigned int rev; 36 }; 37 38 struct device; 39 40 enum ucode_state { 41 UCODE_OK = 0, 42 UCODE_UPDATED, 43 UCODE_NFOUND, 44 UCODE_ERROR, 45 }; 46 47 struct microcode_ops { 48 enum ucode_state (*request_microcode_user) (int cpu, 49 const void __user *buf, size_t size); 50 51 enum ucode_state (*request_microcode_fw) (int cpu, struct device *, 52 bool refresh_fw); 53 54 void (*microcode_fini_cpu) (int cpu); 55 56 /* 57 * The generic 'microcode_core' part guarantees that 58 * the callbacks below run on a target cpu when they 59 * are being called. 60 * See also the "Synchronization" section in microcode_core.c. 61 */ 62 enum ucode_state (*apply_microcode) (int cpu); 63 int (*collect_cpu_info) (int cpu, struct cpu_signature *csig); 64 }; 65 66 struct ucode_cpu_info { 67 struct cpu_signature cpu_sig; 68 int valid; 69 void *mc; 70 }; 71 extern struct ucode_cpu_info ucode_cpu_info[]; 72 struct cpio_data find_microcode_in_initrd(const char *path, bool use_pa); 73 74 #ifdef CONFIG_MICROCODE_INTEL 75 extern struct microcode_ops * __init init_intel_microcode(void); 76 #else 77 static inline struct microcode_ops * __init init_intel_microcode(void) 78 { 79 return NULL; 80 } 81 #endif /* CONFIG_MICROCODE_INTEL */ 82 83 #ifdef CONFIG_MICROCODE_AMD 84 extern struct microcode_ops * __init init_amd_microcode(void); 85 extern void __exit exit_amd_microcode(void); 86 #else 87 static inline struct microcode_ops * __init init_amd_microcode(void) 88 { 89 return NULL; 90 } 91 static inline void __exit exit_amd_microcode(void) {} 92 #endif 93 94 #define MAX_UCODE_COUNT 128 95 96 #define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24)) 97 #define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u') 98 #define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I') 99 #define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l') 100 #define CPUID_AMD1 QCHAR('A', 'u', 't', 'h') 101 #define CPUID_AMD2 QCHAR('e', 'n', 't', 'i') 102 #define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D') 103 104 #define CPUID_IS(a, b, c, ebx, ecx, edx) \ 105 (!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c)))) 106 107 /* 108 * In early loading microcode phase on BSP, boot_cpu_data is not set up yet. 109 * x86_cpuid_vendor() gets vendor id for BSP. 110 * 111 * In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify 112 * coding, we still use x86_cpuid_vendor() to get vendor id for AP. 113 * 114 * x86_cpuid_vendor() gets vendor information directly from CPUID. 115 */ 116 static inline int x86_cpuid_vendor(void) 117 { 118 u32 eax = 0x00000000; 119 u32 ebx, ecx = 0, edx; 120 121 native_cpuid(&eax, &ebx, &ecx, &edx); 122 123 if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx)) 124 return X86_VENDOR_INTEL; 125 126 if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx)) 127 return X86_VENDOR_AMD; 128 129 return X86_VENDOR_UNKNOWN; 130 } 131 132 static inline unsigned int x86_cpuid_family(void) 133 { 134 u32 eax = 0x00000001; 135 u32 ebx, ecx = 0, edx; 136 137 native_cpuid(&eax, &ebx, &ecx, &edx); 138 139 return x86_family(eax); 140 } 141 142 #ifdef CONFIG_MICROCODE 143 int __init microcode_init(void); 144 extern void __init load_ucode_bsp(void); 145 extern void load_ucode_ap(void); 146 void reload_early_microcode(void); 147 extern bool get_builtin_firmware(struct cpio_data *cd, const char *name); 148 extern bool initrd_gone; 149 #else 150 static inline int __init microcode_init(void) { return 0; }; 151 static inline void __init load_ucode_bsp(void) { } 152 static inline void load_ucode_ap(void) { } 153 static inline void reload_early_microcode(void) { } 154 static inline bool 155 get_builtin_firmware(struct cpio_data *cd, const char *name) { return false; } 156 #endif 157 158 #endif /* _ASM_X86_MICROCODE_H */ 159