1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_MICROCODE_H 3 #define _ASM_X86_MICROCODE_H 4 5 #include <asm/msr.h> 6 #include <asm/cpuid/api.h> 7 8 struct cpu_signature { 9 unsigned int sig; 10 unsigned int pf; 11 unsigned int rev; 12 }; 13 14 struct ucode_cpu_info { 15 struct cpu_signature cpu_sig; 16 void *mc; 17 }; 18 19 #ifdef CONFIG_MICROCODE 20 void load_ucode_bsp(void); 21 void load_ucode_ap(void); 22 void microcode_bsp_resume(void); 23 bool __init microcode_loader_disabled(void); 24 #else 25 static inline void load_ucode_bsp(void) { } 26 static inline void load_ucode_ap(void) { } 27 static inline void microcode_bsp_resume(void) { } 28 static inline bool __init microcode_loader_disabled(void) { return false; } 29 #endif 30 31 extern unsigned long initrd_start_early; 32 33 #ifdef CONFIG_CPU_SUP_INTEL 34 /* Intel specific microcode defines. Public for IFS */ 35 struct microcode_header_intel { 36 unsigned int hdrver; 37 unsigned int rev; 38 unsigned int date; 39 unsigned int sig; 40 unsigned int cksum; 41 unsigned int ldrver; 42 unsigned int pf; 43 unsigned int datasize; 44 unsigned int totalsize; 45 unsigned int metasize; 46 unsigned int min_req_ver; 47 unsigned int reserved; 48 }; 49 50 struct microcode_intel { 51 struct microcode_header_intel hdr; 52 unsigned int bits[]; 53 }; 54 55 #define DEFAULT_UCODE_DATASIZE (2000) 56 #define MC_HEADER_SIZE (sizeof(struct microcode_header_intel)) 57 #define MC_HEADER_TYPE_MICROCODE 1 58 #define MC_HEADER_TYPE_IFS 2 59 60 static inline int intel_microcode_get_datasize(struct microcode_header_intel *hdr) 61 { 62 return hdr->datasize ? : DEFAULT_UCODE_DATASIZE; 63 } 64 65 static inline u32 intel_get_microcode_revision(void) 66 { 67 u32 rev, dummy; 68 69 native_wrmsrq(MSR_IA32_UCODE_REV, 0); 70 71 /* As documented in the SDM: Do a CPUID 1 here */ 72 native_cpuid_eax(1); 73 74 /* get the current revision from MSR 0x8B */ 75 native_rdmsr(MSR_IA32_UCODE_REV, dummy, rev); 76 77 return rev; 78 } 79 #endif /* !CONFIG_CPU_SUP_INTEL */ 80 81 bool microcode_nmi_handler(void); 82 void microcode_offline_nmi_handler(void); 83 84 #ifdef CONFIG_MICROCODE_LATE_LOADING 85 DECLARE_STATIC_KEY_FALSE(microcode_nmi_handler_enable); 86 static __always_inline bool microcode_nmi_handler_enabled(void) 87 { 88 return static_branch_unlikely(µcode_nmi_handler_enable); 89 } 90 #else 91 static __always_inline bool microcode_nmi_handler_enabled(void) { return false; } 92 #endif 93 94 #endif /* _ASM_X86_MICROCODE_H */ 95