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/*
* This file is part of the coreboot project.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __UPDATE_UCODE_H
#define __UPDATE_UCODE_H
#include <stdint.h>
#define MSR_UCODE_UPDATE_STATUS 0x00001205
#define NANO_UCODE_SIGNATURE 0x53415252
#define NANO_UCODE_HEADER_SIZE 0x30
/* These are values returned by the CPU after we attempt microcode updates.
* We care what these values are exactly, so we define them to be sure */
typedef enum {
UCODE_UPDATE_NOT_ATTEMPTED = 0x0,
UCODE_UPDATE_SUCCESS = 0x1,
UCODE_UPDATE_FAIL = 0x2,
UCODE_UPDATE_WRONG_CPU = 0x3,
UCODE_INVALID_UPDATE_BLOCK = 0x4,
} ucode_update_status;
typedef enum {
NANO_UCODE_VALID = 0, /* We only care that valid == 0 */
NANO_UCODE_SIGNATURE_ERROR,
NANO_UCODE_WRONG_SIZE,
NANO_UCODE_CHECKSUM_FAIL,
} ucode_validity;
typedef struct {
u32 signature; /* NANO_UCODE_SIGNATURE */
u32 update_revision; /* Revision of the update header */
u16 year; /* Year of patch release */
u8 day; /* Day of patch release */
u8 month; /* Month of patch release */
u32 applicable_fms; /* Fam/model/stepping to which ucode applies */
u32 checksum; /* Two's complement checksum of ucode+header */
u32 loader_revision; /* Revision of hardware ucode update loader*/
u32 rfu_1; /* Reserved for future use */
u32 payload_size; /* Size of the ucode payload only */
u32 total_size; /* Size of the ucode, including header */
char name[8]; /* ASCII string of ucode filename */
u32 rfu_2; /* Reserved for future use */
/* First double-word of the ucode payload
* Its address represents the beginning of the ucode update we need to
* send to the CPU */
u32 ucode_start;
} nano_ucode_header;
unsigned int nano_update_ucode(void);
#endif /* __UPDATE_UCODE_H */
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