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 { UCODE_ERROR, UCODE_OK, UCODE_NFOUND }; 41 42 struct microcode_ops { 43 enum ucode_state (*request_microcode_user) (int cpu, 44 const void __user *buf, size_t size); 45 46 enum ucode_state (*request_microcode_fw) (int cpu, struct device *, 47 bool refresh_fw); 48 49 void (*microcode_fini_cpu) (int cpu); 50 51 /* 52 * The generic 'microcode_core' part guarantees that 53 * the callbacks below run on a target cpu when they 54 * are being called. 55 * See also the "Synchronization" section in microcode_core.c. 56 */ 57 int (*apply_microcode) (int cpu); 58 int (*collect_cpu_info) (int cpu, struct cpu_signature *csig); 59 }; 60 61 struct ucode_cpu_info { 62 struct cpu_signature cpu_sig; 63 int valid; 64 void *mc; 65 }; 66 extern struct ucode_cpu_info ucode_cpu_info[]; 67 struct cpio_data find_microcode_in_initrd(const char *path, bool use_pa); 68 69 #ifdef CONFIG_MICROCODE_INTEL 70 extern struct microcode_ops * __init init_intel_microcode(void); 71 #else 72 static inline struct microcode_ops * __init init_intel_microcode(void) 73 { 74 return NULL; 75 } 76 #endif /* CONFIG_MICROCODE_INTEL */ 77 78 #ifdef CONFIG_MICROCODE_AMD 79 extern struct microcode_ops * __init init_amd_microcode(void); 80 extern void __exit exit_amd_microcode(void); 81 #else 82 static inline struct microcode_ops * __init init_amd_microcode(void) 83 { 84 return NULL; 85 } 86 static inline void __exit exit_amd_microcode(void) {} 87 #endif 88 89 #define MAX_UCODE_COUNT 128 90 91 #define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24)) 92 #define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u') 93 #define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I') 94 #define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l') 95 #define CPUID_AMD1 QCHAR('A', 'u', 't', 'h') 96 #define CPUID_AMD2 QCHAR('e', 'n', 't', 'i') 97 #define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D') 98 99 #define CPUID_IS(a, b, c, ebx, ecx, edx) \ 100 (!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c)))) 101 102 /* 103 * In early loading microcode phase on BSP, boot_cpu_data is not set up yet. 104 * x86_cpuid_vendor() gets vendor id for BSP. 105 * 106 * In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify 107 * coding, we still use x86_cpuid_vendor() to get vendor id for AP. 108 * 109 * x86_cpuid_vendor() gets vendor information directly from CPUID. 110 */ 111 static inline int x86_cpuid_vendor(void) 112 { 113 u32 eax = 0x00000000; 114 u32 ebx, ecx = 0, edx; 115 116 native_cpuid(&eax, &ebx, &ecx, &edx); 117 118 if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx)) 119 return X86_VENDOR_INTEL; 120 121 if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx)) 122 return X86_VENDOR_AMD; 123 124 return X86_VENDOR_UNKNOWN; 125 } 126 127 static inline unsigned int x86_cpuid_family(void) 128 { 129 u32 eax = 0x00000001; 130 u32 ebx, ecx = 0, edx; 131 132 native_cpuid(&eax, &ebx, &ecx, &edx); 133 134 return x86_family(eax); 135 } 136 137 #ifdef CONFIG_MICROCODE 138 int __init microcode_init(void); 139 extern void __init load_ucode_bsp(void); 140 extern void load_ucode_ap(void); 141 void reload_early_microcode(void); 142 extern bool get_builtin_firmware(struct cpio_data *cd, const char *name); 143 extern bool initrd_gone; 144 #else 145 static inline int __init microcode_init(void) { return 0; }; 146 static inline void __init load_ucode_bsp(void) { } 147 static inline void load_ucode_ap(void) { } 148 static inline void reload_early_microcode(void) { } 149 static inline bool 150 get_builtin_firmware(struct cpio_data *cd, const char *name) { return false; } 151 #endif 152 153 #endif /* _ASM_X86_MICROCODE_H */ 154