GdbSerialDebugPortLib.c

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#include <Uefi.h>
#include <Library/GdbSerialLib.h>
#include <Library/PcdLib.h>
#include <Library/IoLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
 
#include <Protocol/DebugPort.h>
 
EFI_DEBUGPORT_PROTOCOL  *gDebugPort = NULL;
UINT32                  gTimeOut    = 0;
 
RETURN_STATUS
EFIAPI
GdbSerialLibDebugPortConstructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS  Status;
 
  Status = gBS->LocateProtocol (&gEfiDebugPortProtocolGuid, NULL, (VOID **)&gDebugPort);
  if (!EFI_ERROR (Status)) {
    gTimeOut = PcdGet32 (PcdGdbMaxPacketRetryCount);
    gDebugPort->Reset (gDebugPort);
  }
 
  return Status;
}
 
RETURN_STATUS
EFIAPI
GdbSerialInit (
  IN UINT64  BaudRate,
  IN UINT8   Parity,
  IN UINT8   DataBits,
  IN UINT8   StopBits
  )
{
  EFI_STATUS  Status;
 
  Status = gDebugPort->Reset (gDebugPort);
  return Status;
}
 
BOOLEAN
EFIAPI
GdbIsCharAvailable (
  VOID
  )
{
  EFI_STATUS  Status;
 
  Status = gDebugPort->Poll (gDebugPort);
 
  return (Status == EFI_SUCCESS ? TRUE : FALSE);
}
 
CHAR8
EFIAPI
GdbGetChar (
  VOID
  )
{
  EFI_STATUS  Status;
  CHAR8       Char;
  UINTN       BufferSize;
 
  do {
    BufferSize = sizeof (Char);
    Status     = gDebugPort->Read (gDebugPort, gTimeOut, &BufferSize, &Char);
  } while (EFI_ERROR (Status) || BufferSize != sizeof (Char));
 
  return Char;
}
 
VOID
EFIAPI
GdbPutChar (
  IN  CHAR8  Char
  )
{
  EFI_STATUS  Status;
  UINTN       BufferSize;
 
  do {
    BufferSize = sizeof (Char);
    Status     = gDebugPort->Write (gDebugPort, gTimeOut, &BufferSize, &Char);
  } while (EFI_ERROR (Status) || BufferSize != sizeof (Char));
 
  return;
}
 
VOID
GdbPutString (
  IN CHAR8  *String
  )
{
  // We could performance enhance this function by calling gDebugPort->Write ()
  while (*String != '\0') {
    GdbPutChar (*String);
    String++;
  }
}