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 */ 78