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 load_ucode_bsp(void)21static inline void load_ucode_bsp(void) { } load_ucode_ap(void)22static inline void load_ucode_ap(void) { } microcode_bsp_resume(void)23static 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 reserved[2]; 42 }; 43 44 struct microcode_intel { 45 struct microcode_header_intel hdr; 46 unsigned int bits[]; 47 }; 48 49 #define DEFAULT_UCODE_DATASIZE (2000) 50 #define MC_HEADER_SIZE (sizeof(struct microcode_header_intel)) 51 #define MC_HEADER_TYPE_MICROCODE 1 52 #define MC_HEADER_TYPE_IFS 2 53 intel_microcode_get_datasize(struct microcode_header_intel * hdr)54static inline int intel_microcode_get_datasize(struct microcode_header_intel *hdr) 55 { 56 return hdr->datasize ? : DEFAULT_UCODE_DATASIZE; 57 } 58 intel_get_microcode_revision(void)59static inline u32 intel_get_microcode_revision(void) 60 { 61 u32 rev, dummy; 62 63 native_wrmsrl(MSR_IA32_UCODE_REV, 0); 64 65 /* As documented in the SDM: Do a CPUID 1 here */ 66 native_cpuid_eax(1); 67 68 /* get the current revision from MSR 0x8B */ 69 native_rdmsr(MSR_IA32_UCODE_REV, dummy, rev); 70 71 return rev; 72 } 73 #endif /* !CONFIG_CPU_SUP_INTEL */ 74 75 bool microcode_nmi_handler(void); 76 void microcode_offline_nmi_handler(void); 77 78 #ifdef CONFIG_MICROCODE_LATE_LOADING 79 DECLARE_STATIC_KEY_FALSE(microcode_nmi_handler_enable); microcode_nmi_handler_enabled(void)80static __always_inline bool microcode_nmi_handler_enabled(void) 81 { 82 return static_branch_unlikely(µcode_nmi_handler_enable); 83 } 84 #else microcode_nmi_handler_enabled(void)85static __always_inline bool microcode_nmi_handler_enabled(void) { return false; } 86 #endif 87 88 #endif /* _ASM_X86_MICROCODE_H */ 89