1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_MICROCODE_H 3 #define _ASM_X86_MICROCODE_H 4 5 struct cpu_signature { 6 unsigned int sig; 7 unsigned int pf; 8 unsigned int rev; 9 }; 10 11 struct ucode_cpu_info { 12 struct cpu_signature cpu_sig; 13 void *mc; 14 }; 15 16 #ifdef CONFIG_MICROCODE 17 void load_ucode_bsp(void); 18 void load_ucode_ap(void); 19 void microcode_bsp_resume(void); 20 #else 21 static inline void load_ucode_bsp(void) { } 22 static inline void load_ucode_ap(void) { } 23 static inline void microcode_bsp_resume(void) { } 24 #endif 25 26 extern unsigned long initrd_start_early; 27 28 #ifdef CONFIG_CPU_SUP_INTEL 29 /* Intel specific microcode defines. Public for IFS */ 30 struct microcode_header_intel { 31 unsigned int hdrver; 32 unsigned int rev; 33 unsigned int date; 34 unsigned int sig; 35 unsigned int cksum; 36 unsigned int ldrver; 37 unsigned int pf; 38 unsigned int datasize; 39 unsigned int totalsize; 40 unsigned int metasize; 41 unsigned int min_req_ver; 42 unsigned int reserved; 43 }; 44 45 struct microcode_intel { 46 struct microcode_header_intel hdr; 47 unsigned int bits[]; 48 }; 49 50 #define DEFAULT_UCODE_DATASIZE (2000) 51 #define MC_HEADER_SIZE (sizeof(struct microcode_header_intel)) 52 #define MC_HEADER_TYPE_MICROCODE 1 53 #define MC_HEADER_TYPE_IFS 2 54 55 static inline int intel_microcode_get_datasize(struct microcode_header_intel *hdr) 56 { 57 return hdr->datasize ? : DEFAULT_UCODE_DATASIZE; 58 } 59 60 static inline u32 intel_get_microcode_revision(void) 61 { 62 u32 rev, dummy; 63 64 native_wrmsrl(MSR_IA32_UCODE_REV, 0); 65 66 /* As documented in the SDM: Do a CPUID 1 here */ 67 native_cpuid_eax(1); 68 69 /* get the current revision from MSR 0x8B */ 70 native_rdmsr(MSR_IA32_UCODE_REV, dummy, rev); 71 72 return rev; 73 } 74 #endif /* !CONFIG_CPU_SUP_INTEL */ 75 76 bool microcode_nmi_handler(void); 77 void microcode_offline_nmi_handler(void); 78 79 #ifdef CONFIG_MICROCODE_LATE_LOADING 80 DECLARE_STATIC_KEY_FALSE(microcode_nmi_handler_enable); 81 static __always_inline bool microcode_nmi_handler_enabled(void) 82 { 83 return static_branch_unlikely(µcode_nmi_handler_enable); 84 } 85 #else 86 static __always_inline bool microcode_nmi_handler_enabled(void) { return false; } 87 #endif 88 89 #endif /* _ASM_X86_MICROCODE_H */ 90