RtcRw.c

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#include <Uefi.h>
#include <Library/BaseMemoryLib.h>
#include <Library/OcDebugLogLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/OcConsoleLib.h>
#include <Library/OcMiscLib.h>
#include <Library/OcRtcLib.h>
#include <Library/OcStringLib.h>
#include <Library/UefiApplicationEntryPoint.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
 
EFI_STATUS
EFIAPI
UefiMain (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS  Status;
  UINTN       Argc;
  CHAR16      **Argv;
  UINTN       Addr;
  UINTN       Value;
  UINTN       Index;
  UINT8       Rtc[256];
 
  gBS->SetWatchdogTimer (0, 0, 0, NULL);
 
  OcProvideConsoleGop (FALSE);
 
  OcConsoleControlSetMode (EfiConsoleControlScreenText);
 
  OcSetConsoleResolution (0, 0, 0, FALSE);
 
  Status = GetArguments (&Argc, &Argv);
  if (!EFI_ERROR (Status) && (Argc >= 2)) {
    if ((OcStriCmp (Argv[1], L"dump") == 0) && (Argc == 2)) {
      for (Index = 0; Index < ARRAY_SIZE (Rtc); ++Index) {
        Rtc[Index] = OcRtcRead ((UINT8)Index);
      }
 
      for (Index = 0; Index < ARRAY_SIZE (Rtc); Index += 16) {
        Print (
          L"%02Xh: %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n",
          Index,
          Rtc[Index+0],
          Rtc[Index+1],
          Rtc[Index+2],
          Rtc[Index+3],
          Rtc[Index+4],
          Rtc[Index+5],
          Rtc[Index+6],
          Rtc[Index+7],
          Rtc[Index+8],
          Rtc[Index+9],
          Rtc[Index+10],
          Rtc[Index+11],
          Rtc[Index+12],
          Rtc[Index+13],
          Rtc[Index+14],
          Rtc[Index+15]
          );
      }
 
      return EFI_SUCCESS;
    }
 
    if ((OcStriCmp (Argv[1], L"read") == 0) && (Argc == 3)) {
      Status = StrHexToUintnS (Argv[2], NULL, &Addr);
      if (EFI_ERROR (Status) || (Addr > 0xFF)) {
        Print (L"Invalid addr %LX - %r\n", (UINT64)Addr, Status);
        return EFI_SUCCESS;
      }
 
      Print (L"Rtc[0x%Xh] = 0x%02X\n", (UINT32)Addr, OcRtcRead ((UINT8)Addr));
      return EFI_SUCCESS;
    }
 
    if ((OcStriCmp (Argv[1], L"write") == 0) && (Argc == 4)) {
      Status = StrHexToUintnS (Argv[2], NULL, &Addr);
      if (EFI_ERROR (Status) || (Addr > 0xFF)) {
        Print (L"Invalid addr %LX - %r\n", (UINT64)Addr, Status);
        return EFI_SUCCESS;
      }
 
      Status = StrHexToUintnS (Argv[3], NULL, &Value);
      if (EFI_ERROR (Status) || (Value > 0xFF)) {
        Print (L"Invalid value %LX - %r\n", (UINT64)Value, Status);
        return EFI_SUCCESS;
      }
 
      Print (
        L"Rtc[0x%X] = 0x%02X -> 0x%02X\n",
        (UINT32)Addr,
        OcRtcRead ((UINT8)Addr),
        (UINT8)Value
        );
      OcRtcWrite ((UINT8)Addr, (UINT8)Value);
      return EFI_SUCCESS;
    }
  }
 
  Print (L"Usage: RtcRw <dump|read|write> <addr> <value>\n");
  return EFI_SUCCESS;
}