ArmPlatformPkg/ArmJunoPkg/Drivers/ArmJunoDxe/ArmJunoDxe.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2013-2015, ARM Limited. All rights reserved.
   4 *
   5 *  This program and the accompanying materials
   6 *  are licensed and made available under the terms and conditions of the BSD License
   7 *  which accompanies this distribution.  The full text of the license may be found at
   8 *  http://opensource.org/licenses/bsd-license.php
   9 *
  10 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 *
  13 **/
  14
  15 #include "ArmJunoDxeInternal.h"
  16 #include <Library/ArmShellCmdLib.h>
  17 #include <Library/AcpiLib.h>
  18
  19 // This GUID must match the FILE_GUID in ArmPlatformPkg/ArmJunoPkg/AcpiTables/AcpiTables.inf
  20 STATIC CONST EFI_GUID mJunoAcpiTableFile = { 0xa1dd808e, 0x1e95, 0x4399, { 0xab, 0xc0, 0x65, 0x3c, 0x82, 0xe8, 0x53, 0x0c } };
  21
  22 EFI_STATUS
  23 EFIAPI
  24 ArmJunoEntryPoint (
  25   IN EFI_HANDLE         ImageHandle,
  26   IN EFI_SYSTEM_TABLE   *SystemTable
  27   )
  28 {
  29   EFI_STATUS           Status;
  30   EFI_PHYSICAL_ADDRESS HypBase;
  31
  32   Status = PciEmulationEntryPoint ();
  33   if (EFI_ERROR (Status)) {
  34     return Status;
  35   }
  36
  37   //
  38   // If a hypervisor has been declared then we need to make sure its region is protected at runtime
  39   //
  40   // Note: This code is only a workaround for our dummy hypervisor (ArmPkg/Extra/AArch64ToAArch32Shim/)
  41   //       that does not set up (yet) the stage 2 translation table to hide its own memory to EL1.
  42   //
  43   if (FixedPcdGet32 (PcdHypFvSize) != 0) {
  44     // Ensure the hypervisor region is strictly contained into a EFI_PAGE_SIZE-aligned region.
  45     // The memory must be a multiple of EFI_PAGE_SIZE to ensure we do not reserve more memory than the hypervisor itself.
  46     // A UEFI Runtime region size granularity cannot be smaller than EFI_PAGE_SIZE. If the hypervisor size is not rounded
  47     // to this size then there is a risk some non-runtime memory could be visible to the OS view.
  48     if (((FixedPcdGet32 (PcdHypFvSize) & EFI_PAGE_MASK) == 0) && ((FixedPcdGet32 (PcdHypFvBaseAddress) & EFI_PAGE_MASK) == 0)) {
  49       // The memory needs to be declared because the DXE core marked it as reserved and removed it from the memory space
  50       // as it contains the Firmware.
  51       Status = gDS->AddMemorySpace (
  52           EfiGcdMemoryTypeSystemMemory,
  53           FixedPcdGet32 (PcdHypFvBaseAddress), FixedPcdGet32 (PcdHypFvSize),
  54           EFI_MEMORY_WB | EFI_MEMORY_RUNTIME
  55           );
  56       if (!EFI_ERROR (Status)) {
  57         // We allocate the memory to ensure it is marked as runtime memory
  58         HypBase = FixedPcdGet32 (PcdHypFvBaseAddress);
  59         Status = gBS->AllocatePages (AllocateAddress, EfiRuntimeServicesCode,
  60                                      EFI_SIZE_TO_PAGES (FixedPcdGet32 (PcdHypFvSize)), &HypBase);
  61       }
  62     } else {
  63       // The hypervisor must be contained into a EFI_PAGE_SIZE-aligned region and its size must also be aligned
  64       // on a EFI_PAGE_SIZE boundary (ie: 4KB).
  65       Status = EFI_UNSUPPORTED;
  66       ASSERT_EFI_ERROR (Status);
  67     }
  68
  69     if (EFI_ERROR (Status)) {
  70       return Status;
  71     }
  72   }
  73
  74   // Install dynamic Shell command to run baremetal binaries.
  75   Status = ShellDynCmdRunAxfInstall (ImageHandle);
  76   if (EFI_ERROR (Status)) {
  77     DEBUG ((EFI_D_ERROR, "ArmJunoDxe: Failed to install ShellDynCmdRunAxf\n"));
  78   }
  79
  80   // Try to install the ACPI Tables
  81   Status = LocateAndInstallAcpiFromFv (&mJunoAcpiTableFile);
  82   if (EFI_ERROR (Status)) {
  83     return Status;
  84   }
  85
  86   return Status;
  87 }