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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_MICROCODE_H
#define _ASM_X86_MICROCODE_H
struct cpu_signature {
unsigned int sig;
unsigned int pf;
unsigned int rev;
};
struct ucode_cpu_info {
struct cpu_signature cpu_sig;
void *mc;
};
#ifdef CONFIG_MICROCODE
void load_ucode_bsp(void);
void load_ucode_ap(void);
void microcode_bsp_resume(void);
#else
static inline void load_ucode_bsp(void) { }
static inline void load_ucode_ap(void) { }
static inline void microcode_bsp_resume(void) { }
#endif
extern unsigned long initrd_start_early;
#ifdef CONFIG_CPU_SUP_INTEL
/* Intel specific microcode defines. Public for IFS */
struct microcode_header_intel {
unsigned int hdrver;
unsigned int rev;
unsigned int date;
unsigned int sig;
unsigned int cksum;
unsigned int ldrver;
unsigned int pf;
unsigned int datasize;
unsigned int totalsize;
unsigned int metasize;
unsigned int min_req_ver;
unsigned int reserved;
};
struct microcode_intel {
struct microcode_header_intel hdr;
unsigned int bits[];
};
#define DEFAULT_UCODE_DATASIZE (2000)
#define MC_HEADER_SIZE (sizeof(struct microcode_header_intel))
#define MC_HEADER_TYPE_MICROCODE 1
#define MC_HEADER_TYPE_IFS 2
static inline int intel_microcode_get_datasize(struct microcode_header_intel *hdr)
{
return hdr->datasize ? : DEFAULT_UCODE_DATASIZE;
}
static inline u32 intel_get_microcode_revision(void)
{
u32 rev, dummy;
native_wrmsrl(MSR_IA32_UCODE_REV, 0);
/* As documented in the SDM: Do a CPUID 1 here */
native_cpuid_eax(1);
/* get the current revision from MSR 0x8B */
native_rdmsr(MSR_IA32_UCODE_REV, dummy, rev);
return rev;
}
#endif /* !CONFIG_CPU_SUP_INTEL */
bool microcode_nmi_handler(void);
void microcode_offline_nmi_handler(void);
#ifdef CONFIG_MICROCODE_LATE_LOADING
DECLARE_STATIC_KEY_FALSE(microcode_nmi_handler_enable);
static __always_inline bool microcode_nmi_handler_enabled(void)
{
return static_branch_unlikely(µcode_nmi_handler_enable);
}
#else
static __always_inline bool microcode_nmi_handler_enabled(void) { return false; }
#endif
#endif /* _ASM_X86_MICROCODE_H */