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),
22 fd(std::move(fd)),
23 mmap(stdplus::fd::MMap(
24 *this->fd, regionSize, stdplus::fd::ProtFlags{PROT_READ | PROT_WRITE},
25 stdplus::fd::MMapFlags{stdplus::fd::MMapAccess::Shared}, regionAddress))
26 {}
27
read(const uint32_t offset,const uint32_t length)28 std::vector<uint8_t> PciDataHandler::read(const uint32_t offset,
29 const uint32_t length)
30 {
31 if (offset > regionSize || length == 0)
32 {
33 stdplus::print(stderr,
34 "[read] Offset [{}] was bigger than regionSize [{}] "
35 "OR length [{}] was equal to 0\n",
36 offset, regionSize, length);
37 return {};
38 }
39
40 // Read up to regionSize in case the offset + length overflowed
41 uint32_t finalLength = (offset + length < regionSize) ? length
42 : regionSize - offset;
43 std::vector<uint8_t> results(finalLength);
44
45 std::memcpy(results.data(), mmap.get().data() + offset, finalLength);
46 return results;
47 }
48
write(const uint32_t offset,const std::span<const uint8_t> bytes)49 uint32_t PciDataHandler::write(const uint32_t offset,
50 const std::span<const uint8_t> bytes)
51 {
52 const size_t length = bytes.size();
53 if (offset > regionSize || length == 0)
54 {
55 stdplus::print(stderr,
56 "[write] Offset [{}] was bigger than regionSize [{}] "
57 "OR length [{}] was equal to 0\n",
58 offset, regionSize, length);
59 return 0;
60 }
61
62 // Write up to regionSize in case the offset + length overflowed
63 uint16_t finalLength = (offset + length < regionSize) ? length
64 : regionSize - offset;
65 std::memcpy(mmap.get().data() + offset, bytes.data(), finalLength);
66 return finalLength;
67 }
68
getMemoryRegionSize()69 uint32_t PciDataHandler::getMemoryRegionSize()
70 {
71 return regionSize;
72 }
73
74 } // namespace bios_bmc_smm_error_logger
75