chip/g/signed_header.h

/* Copyright 2015 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#ifndef __CROS_EC_SIGNED_HEADER_H
#define __CROS_EC_SIGNED_HEADER_H

#include "compile_time_macros.h"

#define FUSE_PADDING 0x55555555  /* baked in hw! */
#define FUSE_IGNORE 0xa3badaac   /* baked in rom! */
#define FUSE_MAX 128             /* baked in rom! */

#define INFO_MAX 128             /* baked in rom! */
#define INFO_IGNORE 0xaa3c55c3   /* baked in rom! */

struct SignedHeader {
	uint32_t magic;       /* -1 (thanks, boot_sys!) */
	uint32_t signature[96];
	uint32_t img_chk_;    /* top 32 bit of expected img_hash */
	/* --------------------- everything below is part of img_hash */
	uint32_t tag[7];      /* words 0-6 of RWR/FWR */
	uint32_t keyid;       /* word 7 of RWR */
	uint32_t key[96];     /* public key to verify signature with */
	uint32_t image_size;
	uint32_t ro_base;     /* readonly region */
	uint32_t ro_max;
	uint32_t rx_base;     /* executable region */
	uint32_t rx_max;
	uint32_t fusemap[FUSE_MAX / (8 * sizeof(uint32_t))];
	uint32_t infomap[INFO_MAX / (8 * sizeof(uint32_t))];
	uint32_t epoch_;      /* word 7 of FWR */
	uint32_t major_;      /* keyladder count */
	uint32_t minor_;
	uint64_t timestamp_;  /* time of signing */
	uint32_t p4cl_;
	/* bits to and with FUSE_FW_DEFINED_BROM_APPLYSEC */
	uint32_t applysec_;
	/* bits to mesh with FUSE_FW_DEFINED_BROM_CONFIG1 */
	uint32_t config1_;
	/* bits to or with FUSE_FW_DEFINED_BROM_ERR_RESPONSE */
	uint32_t err_response_;
	/* action to take when expectation is violated */
	uint32_t expect_response_;
	uint32_t _pad[256 - 1 - 96 - 1 - 7 - 1 - 96 -
			5*1 - 4 - 4 - 9*1 - 2 - 1];
	uint32_t fuses_chk_;  /* top 32 bit of expected fuses hash */
	uint32_t info_chk_;   /* top 32 bit of expected info hash */
};

BUILD_ASSERT(sizeof(struct SignedHeader) == 1024);
BUILD_ASSERT(offsetof(struct SignedHeader, info_chk_) == 1020);
#define TOP_IMAGE_SIZE_BIT (1 <<			\
	    (sizeof(((struct SignedHeader *)0)->image_size) * 8 - 1))
#endif /* __CROS_EC_SIGNED_HEADER_H */