include/asm-x86/microcode.h

extern int microcode_init(void *opaque, struct module *module);
extern void microcode_exit(void);

struct microcode_ops {
	long (*get_next_ucode)(void **mc, long offset);
	long (*microcode_get_next_ucode)(void **mc, long offset);
	int (*get_matching_microcode)(void *mc, int cpu);
	int (*apply_microcode_check_cpu)(int cpu);
	int (*microcode_sanity_check)(void *mc);
	int (*cpu_request_microcode)(int cpu);
	void (*collect_cpu_info)(int cpu_num);
	void (*apply_microcode)(int cpu);
	void (*microcode_fini_cpu)(int cpu);
	void (*clear_patch)(void *data);
};

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            reserved[3];
};

struct microcode_intel {
	struct microcode_header_intel hdr;
	unsigned int            bits[0];
};

/* microcode format is extended from prescott processors */
struct extended_signature {
	unsigned int            sig;
	unsigned int            pf;
	unsigned int            cksum;
};

struct extended_sigtable {
	unsigned int            count;
	unsigned int            cksum;
	unsigned int            reserved[3];
	struct extended_signature sigs[0];
};

struct equiv_cpu_entry {
	unsigned int installed_cpu;
	unsigned int fixed_errata_mask;
	unsigned int fixed_errata_compare;
	unsigned int equiv_cpu;
};

struct microcode_header_amd {
	unsigned int  data_code;
	unsigned int  patch_id;
	unsigned char mc_patch_data_id[2];
	unsigned char mc_patch_data_len;
	unsigned char init_flag;
	unsigned int  mc_patch_data_checksum;
	unsigned int  nb_dev_id;
	unsigned int  sb_dev_id;
	unsigned char processor_rev_id[2];
	unsigned char nb_rev_id;
	unsigned char sb_rev_id;
	unsigned char bios_api_rev;
	unsigned char reserved1[3];
	unsigned int  match_reg[8];
};

struct microcode_amd {
	struct microcode_header_amd hdr;
	unsigned int mpb[0];
};

struct ucode_cpu_info {
	int valid;
	unsigned int sig;
	unsigned int pf;
	unsigned int rev;
	union {
		struct microcode_intel *mc_intel;
		struct microcode_amd *mc_amd;
	} mc;
};