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 "data.hpp"
18 #include "pci_handler.hpp"
19
20 #include <fcntl.h>
21
22 #include <cstdint>
23 #include <cstring>
24 #include <string>
25 #include <vector>
26
27 namespace ipmi_flash
28 {
29
open()30 bool PciDataHandler::open()
31 {
32 static constexpr auto devmem = "/dev/mem";
33
34 mappedFd = sys->open(devmem, O_RDWR | O_SYNC);
35 if (mappedFd == -1)
36 {
37 std::fprintf(stderr, "PciDataHandler::Unable to open /dev/mem");
38 return false;
39 }
40
41 mapped = reinterpret_cast<uint8_t*>(sys->mmap(
42 0, memoryRegionSize, PROT_READ, MAP_SHARED, mappedFd, regionAddress));
43 if (mapped == MAP_FAILED)
44 {
45 sys->close(mappedFd);
46 mappedFd = -1;
47 mapped = nullptr;
48
49 std::fprintf(stderr, "PciDataHandler::Unable to map region");
50 return false;
51 }
52
53 return true;
54 }
55
close()56 bool PciDataHandler::close()
57 {
58 /* TODO: Turn off the P2A bridge and region to disable host-side access.
59 */
60 if (mapped)
61 {
62 sys->munmap(mapped, memoryRegionSize);
63 mapped = nullptr;
64 }
65
66 if (mappedFd != -1)
67 {
68 sys->close(mappedFd);
69 mappedFd = -1;
70 }
71
72 return true;
73 }
74
copyFrom(std::uint32_t length)75 std::vector<std::uint8_t> PciDataHandler::copyFrom(std::uint32_t length)
76 {
77 std::vector<std::uint8_t> results(length);
78 std::memcpy(results.data(), mapped, length);
79
80 return results;
81 }
82
writeMeta(const std::vector<std::uint8_t> &)83 bool PciDataHandler::writeMeta(const std::vector<std::uint8_t>&)
84 {
85 /* PCI handler doesn't require configuration write, only read. */
86 return false;
87 }
88
readMeta()89 std::vector<std::uint8_t> PciDataHandler::readMeta()
90 {
91 /* PCI handler does require returning a configuration from read. */
92 struct PciConfigResponse reply;
93 reply.address = regionAddress;
94
95 std::vector<std::uint8_t> bytes;
96 bytes.resize(sizeof(reply));
97 std::memcpy(bytes.data(), &reply, sizeof(reply));
98
99 return bytes;
100 }
101
102 } // namespace ipmi_flash
103