1/* SPDX-License-Identifier: MIT */
2/*
3 * Copyright © 2019 Intel Corporation
4 */
5
6#ifndef _INTEL_UC_FW_ABI_H
7#define _INTEL_UC_FW_ABI_H
8
9#include <linux/types.h>
10#include <linux/build_bug.h>
11
12/**
13 * DOC: Firmware Layout
14 *
15 * The GuC/HuC firmware layout looks like this::
16 *
17 * +======================================================================+
18 * | Firmware blob |
19 * +===============+===============+============+============+============+
20 * | CSS header | uCode | RSA key | modulus | exponent |
21 * +===============+===============+============+============+============+
22 * <-header size-> <---header size continued ----------->
23 * <--- size ----------------------------------------------------------->
24 * <-key size->
25 * <-mod size->
26 * <-exp size->
27 *
28 * The firmware may or may not have modulus key and exponent data. The header,
29 * uCode and RSA signature are must-have components that will be used by driver.
30 * Length of each components, which is all in dwords, can be found in header.
31 * In the case that modulus and exponent are not present in fw, a.k.a truncated
32 * image, the length value still appears in header.
33 *
34 * Driver will do some basic fw size validation based on the following rules:
35 *
36 * 1. Header, uCode and RSA are must-have components.
37 * 2. All firmware components, if they present, are in the sequence illustrated
38 * in the layout table above.
39 * 3. Length info of each component can be found in header, in dwords.
40 * 4. Modulus and exponent key are not required by driver. They may not appear
41 * in fw. So driver will load a truncated firmware in this case.
42 *
43 * Starting from DG2, the HuC is loaded by the GSC instead of i915. The GSC
44 * firmware performs all the required integrity checks, we just need to check
45 * the version. Note that the header for GSC-managed blobs is different from the
46 * CSS used for dma-loaded firmwares.
47 */
48
49struct uc_css_header {
50 u32 module_type;
51 /*
52 * header_size includes all non-uCode bits, including css_header, rsa
53 * key, modulus key and exponent data.
54 */
55 u32 header_size_dw;
56 u32 header_version;
57 u32 module_id;
58 u32 module_vendor;
59 u32 date;
60#define CSS_DATE_DAY (0xFF << 0)
61#define CSS_DATE_MONTH (0xFF << 8)
62#define CSS_DATE_YEAR (0xFFFF << 16)
63 u32 size_dw; /* uCode plus header_size_dw */
64 u32 key_size_dw;
65 u32 modulus_size_dw;
66 u32 exponent_size_dw;
67 u32 time;
68#define CSS_TIME_HOUR (0xFF << 0)
69#define CSS_DATE_MIN (0xFF << 8)
70#define CSS_DATE_SEC (0xFFFF << 16)
71 char username[8];
72 char buildnumber[12];
73 u32 sw_version;
74#define CSS_SW_VERSION_UC_MAJOR (0xFF << 16)
75#define CSS_SW_VERSION_UC_MINOR (0xFF << 8)
76#define CSS_SW_VERSION_UC_PATCH (0xFF << 0)
77 u32 vf_version;
78 u32 reserved0[12];
79 union {
80 u32 private_data_size; /* only applies to GuC */
81 u32 reserved1;
82 };
83 u32 header_info;
84} __packed;
85static_assert(sizeof(struct uc_css_header) == 128);
86
87#endif /* _INTEL_UC_FW_ABI_H */
88

source code of linux/drivers/gpu/drm/i915/gt/uc/intel_uc_fw_abi.h