PrmSsdtInstallDxe.c

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#include <IndustryStandard/Acpi.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/DxeServicesLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/AcpiTable.h>
 
#define _DBGMSGID_  "[PRMSSDTINSTALL]"
 
EFI_STATUS
InstallPrmSsdt (
  IN  CONST UINT8  *OemId
  )
{
  EFI_STATUS                   Status;
  UINTN                        SsdtSize;
  UINTN                        TableKey;
  EFI_ACPI_TABLE_PROTOCOL      *AcpiTableProtocol;
  EFI_ACPI_DESCRIPTION_HEADER  *Ssdt;
 
  DEBUG ((DEBUG_INFO, "%a %a - Entry.\n", _DBGMSGID_, __func__));
 
  if (OemId == NULL) {
    return EFI_INVALID_PARAMETER;
  }
 
  Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID **)&AcpiTableProtocol);
  if (!EFI_ERROR (Status)) {
    //
    // Discover the SSDT
    //
    Status =  GetSectionFromFv (
                &gEfiCallerIdGuid,
                EFI_SECTION_RAW,
                0,
                (VOID **)&Ssdt,
                &SsdtSize
                );
    ASSERT_EFI_ERROR (Status);
    DEBUG ((DEBUG_INFO, "%a %a: SSDT loaded...\n", _DBGMSGID_, __func__));
 
    //
    // Update OEM ID in the SSDT
    //
    CopyMem (&Ssdt->OemId, OemId, sizeof (Ssdt->OemId));
 
    //
    // Publish the SSDT. Table is re-checksummed.
    //
    TableKey = 0;
    Status   = AcpiTableProtocol->InstallAcpiTable (
                                    AcpiTableProtocol,
                                    Ssdt,
                                    SsdtSize,
                                    &TableKey
                                    );
    ASSERT_EFI_ERROR (Status);
  }
 
  return Status;
}
 
EFI_STATUS
EFIAPI
PrmSsdtInstallEntryPoint (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS  Status;
 
  Status = InstallPrmSsdt ((UINT8 *)PcdGetPtr (PcdAcpiDefaultOemId));
  ASSERT_EFI_ERROR (Status);
 
  return Status;
}