1 /** 2 * Functions for generating pseudo-random CXL protocol error sections. 3 * 4 * Author: Lawrence.Tang@arm.com 5 **/ 6 7 #include <stdlib.h> 8 #include <libcper/BaseTypes.h> 9 #include <libcper/generator/gen-utils.h> 10 #include <libcper/generator/sections/gen-section.h> 11 12 //Generates a single pseudo-random CXL protocol error section, saving the resulting address to the given 13 //location. Returns the size of the newly created section. generate_section_cxl_protocol(void ** location,GEN_VALID_BITS_TEST_TYPE validBitsType)14size_t generate_section_cxl_protocol(void **location, 15 GEN_VALID_BITS_TEST_TYPE validBitsType) 16 { 17 //Create a random length for the CXL DVSEC and CXL error log. 18 //The logs attached here do not necessarily conform to the specification, and are simply random. 19 int dvsec_len = rand() % 64; 20 int error_log_len = rand() % 64; 21 22 //Create random bytes. 23 int size = 116 + dvsec_len + error_log_len; 24 UINT8 *bytes = generate_random_bytes(size); 25 26 //Set CXL agent type. 27 int cxl_agent_type = rand() % 2; 28 *(bytes + 8) = cxl_agent_type; 29 30 //Set reserved areas to zero. 31 UINT64 *validation = (UINT64 *)bytes; 32 *validation &= 0x67; 33 if (validBitsType == ALL_VALID) { 34 *validation = 0x67; 35 } else if (validBitsType == SOME_VALID) { 36 *validation = 0x25; 37 } 38 for (int i = 0; i < 7; i++) { 39 *(bytes + 9 + i) = 0; //Reserved bytes 9-15. 40 } 41 42 //We only reserve bytes if it's a CXL 1.1 device, and not a host downstream port. 43 if (cxl_agent_type == 0) { 44 for (int i = 0; i < 3; i++) { 45 *(bytes + 21 + i) = 0; //CXL agent address bytes 5-7. 46 } 47 *validation |= 48 0x18; //Device Serial Number depends on agent type 49 } 50 51 *(bytes + 34) &= ~0x7; //Device ID byte 10 bits 0-2. 52 UINT32 *reserved = (UINT32 *)(bytes + 36); 53 *reserved = 0; //Device ID bytes 12-15. 54 reserved = (UINT32 *)(bytes + 112); 55 *reserved = 0; //Reserved bytes 112-115. 56 57 //If the device is a host downstream port, serial/capability structure is invalid. 58 if (cxl_agent_type != 0) { 59 for (int i = 0; i < 68; i++) { 60 *(bytes + 40 + i) = 61 0; //Device serial & capability structure. 62 } 63 } 64 65 //Set expected values. 66 UINT16 *dvsec_length_field = (UINT16 *)(bytes + 108); 67 UINT16 *error_log_len_field = (UINT16 *)(bytes + 110); 68 *dvsec_length_field = dvsec_len; 69 *error_log_len_field = error_log_len; 70 71 //Set return values, exit. 72 *location = bytes; 73 return size; 74 } 75