1 files changed, 116 insertions, 0 deletions
diff --git a/Lesson_30/UefiLessonsPkg/ListPCI/ListPCI.c b/Lesson_30/UefiLessonsPkg/ListPCI/ListPCI.c
new file mode 100644
index 0000000..e8d5842
--- /dev/null
+++ b/Lesson_30/UefiLessonsPkg/ListPCI/ListPCI.c
@@ -0,0 +1,116 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Protocol/PciRootBridgeIo.h>
+#include <Library/MemoryAllocationLib.h>
+#include <IndustryStandard/Pci.h>
+
+
+UINT64 PciConfigurationAddress(UINT8 Bus,
+                               UINT8 Device,
+                               UINT8 Function,
+                               UINT32 Register)
+{
+  UINT64 Address = (((UINT64)Bus) << 24) + (((UINT64)Device) << 16) + (((UINT64)Function) << 8);
+  if (Register & 0xFFFFFF00) {
+    Address += (((UINT64)Register) << 32);
+  } else {
+    Address += (((UINT64)Register) << 0);
+  }
+  return Address;
+}
+
+
+EFI_STATUS PrintRootBridge(EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL* PciRootBridgeIo)
+{
+  EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR* AddressDescriptor;
+  EFI_STATUS Status = PciRootBridgeIo->Configuration(
+                                         PciRootBridgeIo,
+                                         (VOID**)&AddressDescriptor
+                                       );
+  if (EFI_ERROR(Status)) {
+    Print(L"\tError! Can't get EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR: %r\n", Status);
+    return Status;
+  }
+  while (AddressDescriptor->Desc != ACPI_END_TAG_DESCRIPTOR) {
+    if (AddressDescriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_BUS) {
+      for (UINT8 Bus = AddressDescriptor->AddrRangeMin; Bus <= AddressDescriptor->AddrRangeMax; Bus++) {
+        for (UINT8 Device = 0; Device <= PCI_MAX_DEVICE; Device++) {
+          for (UINT8 Func = 0; Func <= PCI_MAX_FUNC; Func++) {
+            UINT64 Address = PciConfigurationAddress(Bus, Device, Func, 0);
+            PCI_DEVICE_INDEPENDENT_REGION PCIConfHdr;
+            Status = PciRootBridgeIo->Pci.Read(
+              PciRootBridgeIo,
+              EfiPciWidthUint8,
+              Address,
+              sizeof(PCI_DEVICE_INDEPENDENT_REGION),
+              &PCIConfHdr
+            );
+            if (!EFI_ERROR(Status)) {
+              if (PCIConfHdr.VendorId != 0xffff) {
+                Print(L"\tBus: %02x, Dev: %02x, Func: %02x - Vendor:%04x, Device:%04x\n",
+                                                                        Bus,
+                                                                        Device,
+                                                                        Func,
+                                                                        PCIConfHdr.VendorId, 
+                                                                        PCIConfHdr.DeviceId);
+              }
+            } else {
+              Print(L"\tError in PCI read: %r\n", Status);
+            }
+          }
+        }
+      }
+    }
+    AddressDescriptor++;
+  }
+  return Status;
+}
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS             Status;
+  UINTN                  HandleCount;
+  EFI_HANDLE             *HandleBuffer;
+  Status = gBS->LocateHandleBuffer(
+                  ByProtocol,
+                  &gEfiPciRootBridgeIoProtocolGuid,
+                  NULL,
+                  &HandleCount,
+                  &HandleBuffer
+                );
+  if (EFI_ERROR (Status)) {
+    Print(L"Can't locate EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL: %r\n", Status);
+    return Status;
+  }
+
+  Print(L"Number of PCI root bridges in the system: %d\n", HandleCount);
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL* PciRootBridgeIo;
+  for (UINTN Index = 0; Index < HandleCount; Index++) {
+    Status = gBS->OpenProtocol (
+                    HandleBuffer[Index],
+                    &gEfiPciRootBridgeIoProtocolGuid,
+                    (VOID **)&PciRootBridgeIo,
+                    ImageHandle,
+                    NULL,
+                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
+                  );
+    if (EFI_ERROR(Status)) {
+      Print(L"Can't open protocol: %r\n", Status);
+      return Status;
+    }
+    Print(L"\nPCI Root Bridge %d\n", Index);
+    Status = PrintRootBridge(PciRootBridgeIo);
+    if (EFI_ERROR(Status)) {
+      Print(L"Error in PCI Root Bridge printing\n");
+    }
+  }
+  FreePool(HandleBuffer);
+
+  return EFI_SUCCESS;
+}