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 7 struct cpu_signature { 8 unsigned int sig; 9 unsigned int pf; 10 unsigned int rev; 11 }; 12 13 struct ucode_cpu_info { 14 struct cpu_signature cpu_sig; 15 void *mc; 16 }; 17 18 #ifdef CONFIG_MICROCODE 19 void load_ucode_bsp(void); 20 void load_ucode_ap(void); 21 void microcode_bsp_resume(void); 22 bool __init microcode_loader_disabled(void); 23 #else 24 static inline void load_ucode_bsp(void) { } 25 static inline void load_ucode_ap(void) { } 26 static inline void microcode_bsp_resume(void) { } 27 static inline bool __init microcode_loader_disabled(void) { return false; } 28 #endif 29 30 extern unsigned long initrd_start_early; 31 32 #ifdef CONFIG_CPU_SUP_INTEL 33 /* Intel specific microcode defines. Public for IFS */ 34 struct microcode_header_intel { 35 unsigned int hdrver; 36 unsigned int rev; 37 unsigned int date; 38 unsigned int sig; 39 unsigned int cksum; 40 unsigned int ldrver; 41 unsigned int pf; 42 unsigned int datasize; 43 unsigned int totalsize; 44 unsigned int metasize; 45 unsigned int min_req_ver; 46 unsigned int reserved; 47 }; 48 49 struct microcode_intel { 50 struct microcode_header_intel hdr; 51 unsigned int bits[]; 52 }; 53 54 #define DEFAULT_UCODE_DATASIZE (2000) 55 #define MC_HEADER_SIZE (sizeof(struct microcode_header_intel)) 56 #define MC_HEADER_TYPE_MICROCODE 1 57 #define MC_HEADER_TYPE_IFS 2 58 59 static inline int intel_microcode_get_datasize(struct microcode_header_intel *hdr) 60 { 61 return hdr->datasize ? : DEFAULT_UCODE_DATASIZE; 62 } 63 64 extern u32 intel_get_platform_id(void); 65 66 static inline u32 intel_get_microcode_revision(void) 67 { 68 u32 rev, dummy; 69 70 native_wrmsrq(MSR_IA32_UCODE_REV, 0); 71 72 /* As documented in the SDM: Do a CPUID 1 here */ 73 native_cpuid_eax(1); 74 75 /* get the current revision from MSR 0x8B */ 76 native_rdmsr(MSR_IA32_UCODE_REV, dummy, rev); 77 78 return rev; 79 } 80 #endif /* !CONFIG_CPU_SUP_INTEL */ 81 82 bool microcode_nmi_handler(void); 83 void microcode_offline_nmi_handler(void); 84 85 #ifdef CONFIG_MICROCODE_LATE_LOADING 86 DECLARE_STATIC_KEY_FALSE(microcode_nmi_handler_enable); 87 static __always_inline bool microcode_nmi_handler_enabled(void) 88 { 89 return static_branch_unlikely(µcode_nmi_handler_enable); 90 } 91 #else 92 static __always_inline bool microcode_nmi_handler_enabled(void) { return false; } 93 #endif 94 95 #endif /* _ASM_X86_MICROCODE_H */ 96