1 #include "pci_handler.hpp"
2
3 #include <fcntl.h>
4
5 #include <stdplus/fd/managed.hpp>
6 #include <stdplus/fd/mmap.hpp>
7 #include <stdplus/print.hpp>
8
9 #include <cstdint>
10 #include <cstring>
11 #include <format>
12 #include <memory>
13 #include <span>
14 #include <vector>
15
16 namespace bios_bmc_smm_error_logger
17 {
18
PciDataHandler(uint32_t regionAddress,size_t regionSize,std::unique_ptr<stdplus::fd::Fd> fd)19 PciDataHandler::PciDataHandler(uint32_t regionAddress, size_t regionSize,
20 std::unique_ptr<stdplus::fd::Fd> fd) :
21 regionSize(regionSize), fd(std::move(fd)),
22 mmap(stdplus::fd::MMap(
23 *this->fd, regionSize, stdplus::fd::ProtFlags{PROT_READ | PROT_WRITE},
24 stdplus::fd::MMapFlags{stdplus::fd::MMapAccess::Shared}, regionAddress))
25 {}
26
read(const uint32_t offset,const uint32_t length)27 std::vector<uint8_t> PciDataHandler::read(const uint32_t offset,
28 const uint32_t length)
29 {
30 if (offset > regionSize || length == 0)
31 {
32 stdplus::print(stderr,
33 "[read] Offset [{}] was bigger than regionSize [{}] "
34 "OR length [{}] was equal to 0\n",
35 offset, regionSize, length);
36 return {};
37 }
38
39 // Read up to regionSize in case the offset + length overflowed
40 uint32_t finalLength =
41 (offset + length < regionSize) ? length : regionSize - offset;
42 std::vector<uint8_t> results(finalLength);
43
44 std::memcpy(results.data(), mmap.get().data() + offset, finalLength);
45 return results;
46 }
47
write(const uint32_t offset,const std::span<const uint8_t> bytes)48 uint32_t PciDataHandler::write(const uint32_t offset,
49 const std::span<const uint8_t> bytes)
50 {
51 const size_t length = bytes.size();
52 if (offset > regionSize || length == 0)
53 {
54 stdplus::print(stderr,
55 "[write] Offset [{}] was bigger than regionSize [{}] "
56 "OR length [{}] was equal to 0\n",
57 offset, regionSize, length);
58 return 0;
59 }
60
61 // Write up to regionSize in case the offset + length overflowed
62 uint16_t finalLength =
63 (offset + length < regionSize) ? length : regionSize - offset;
64 std::memcpy(mmap.get().data() + offset, bytes.data(), finalLength);
65 return finalLength;
66 }
67
getMemoryRegionSize()68 uint32_t PciDataHandler::getMemoryRegionSize()
69 {
70 return regionSize;
71 }
72
73 } // namespace bios_bmc_smm_error_logger
74