drivers/gpu/drm/i915/gt/uc/intel_uc_fw_abi.h

   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
  44 struct uc_css_header {
  45         u32 module_type;
  46         /*
  47          * header_size includes all non-uCode bits, including css_header, rsa
  48          * key, modulus key and exponent data.
  49          */
  50         u32 header_size_dw;
  51         u32 header_version;
  52         u32 module_id;
  53         u32 module_vendor;
  54         u32 date;
  55 #define CSS_DATE_DAY                    (0xFF << 0)
  56 #define CSS_DATE_MONTH                  (0xFF << 8)
  57 #define CSS_DATE_YEAR                   (0xFFFF << 16)
  58         u32 size_dw; /* uCode plus header_size_dw */
  59         u32 key_size_dw;
  60         u32 modulus_size_dw;
  61         u32 exponent_size_dw;
  62         u32 time;
  63 #define CSS_TIME_HOUR                   (0xFF << 0)
  64 #define CSS_DATE_MIN                    (0xFF << 8)
  65 #define CSS_DATE_SEC                    (0xFFFF << 16)
  66         char username[8];
  67         char buildnumber[12];
  68         u32 sw_version;
  69 #define CSS_SW_VERSION_UC_MAJOR         (0xFF << 16)
  70 #define CSS_SW_VERSION_UC_MINOR         (0xFF << 8)
  71 #define CSS_SW_VERSION_UC_PATCH         (0xFF << 0)
  72         u32 reserved[14];
  73         u32 header_info;
  74 } __packed;
  75 static_assert(sizeof(struct uc_css_header) == 128);
  76
  77 #endif /* _INTEL_UC_FW_ABI_H */