1 /* 2 * Copyright 2018 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "lpc_handler.hpp" 18 19 #include <cstdint> 20 #include <cstring> 21 #include <vector> 22 23 namespace ipmi_flash 24 { 25 26 bool LpcDataHandler::open() 27 { 28 /* For the ASPEED LPC CTRL driver, the ioctl is required to set up the 29 * window, with information from writeMeta() below. 30 */ 31 return true; 32 } 33 34 bool LpcDataHandler::close() 35 { 36 mapper->close(); 37 38 return setInitializedAndReturn(false); 39 } 40 41 std::vector<std::uint8_t> LpcDataHandler::copyFrom(std::uint32_t length) 42 { 43 /* TODO: implement this -- in an earlier and different version of this that 44 * didn't use BLOBs, the region was memory-mapped and the writes to the data 45 * were just done directly from the memory-mapped region instead of a 46 * copyFrom() first call. The idea with this change is that we may not be 47 * able to get a memory-mapped handle from the driver from which to 48 * automatically read data, but rather must perform some ioctl or other 49 * access to get the data from the driver. 50 */ 51 if (!initialized) 52 { 53 /* TODO: Consider designing some exceptions we can catch for when there 54 * is an error. 55 */ 56 return {}; 57 } 58 59 std::vector<std::uint8_t> results(length); 60 std::memcpy(results.data(), memory.mapped + mappingResult.windowOffset, 61 length); 62 63 return results; 64 } 65 66 bool LpcDataHandler::writeMeta(const std::vector<std::uint8_t>& configuration) 67 { 68 struct LpcRegion lpcRegion; 69 70 if (configuration.size() != sizeof(lpcRegion)) 71 { 72 return false; 73 } 74 75 std::memcpy(&lpcRegion, configuration.data(), configuration.size()); 76 77 /* TODO: LpcRegion sanity checking. */ 78 mappingResult = mapper->mapWindow(lpcRegion.address, lpcRegion.length); 79 if (mappingResult.response != 0) 80 { 81 std::fprintf(stderr, "mappingResult.response %u\n", 82 mappingResult.response); 83 /* Failed to map region. */ 84 return false; 85 } 86 87 return setInitializedAndReturn(true); 88 } 89 90 std::vector<std::uint8_t> LpcDataHandler::readMeta() 91 { 92 /* Return the MemoryResult structure packed. */ 93 std::vector<std::uint8_t> output( 94 sizeof(std::uint8_t) + sizeof(std::uint32_t) + sizeof(std::uint32_t)); 95 96 int index = 0; 97 std::memcpy(&output[index], &mappingResult.response, 98 sizeof(mappingResult.response)); 99 100 index += sizeof(mappingResult.response); 101 std::memcpy(&output[index], &mappingResult.windowOffset, 102 sizeof(mappingResult.windowOffset)); 103 104 index += sizeof(mappingResult.windowOffset); 105 std::memcpy(&output[index], &mappingResult.windowSize, 106 sizeof(mappingResult.windowSize)); 107 108 return output; 109 } 110 111 } // namespace ipmi_flash 112