diff options
Diffstat (limited to 'roms/edk2/OvmfPkg/SmmAccess/SmmAccess2Dxe.c')
| -rw-r--r-- | roms/edk2/OvmfPkg/SmmAccess/SmmAccess2Dxe.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/SmmAccess/SmmAccess2Dxe.c b/roms/edk2/OvmfPkg/SmmAccess/SmmAccess2Dxe.c new file mode 100644 index 000000000..3691a6cd1 --- /dev/null +++ b/roms/edk2/OvmfPkg/SmmAccess/SmmAccess2Dxe.c @@ -0,0 +1,158 @@ +/** @file
+
+ A DXE_DRIVER providing SMRAM access by producing EFI_SMM_ACCESS2_PROTOCOL.
+
+ Q35 TSEG is expected to have been verified and set up by the SmmAccessPei
+ driver.
+
+ Copyright (C) 2013, 2015, Red Hat, Inc.<BR>
+ Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/DebugLib.h>
+#include <Library/PcdLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Protocol/SmmAccess2.h>
+
+#include "SmramInternal.h"
+
+/**
+ Opens the SMRAM area to be accessible by a boot-service driver.
+
+ This function "opens" SMRAM so that it is visible while not inside of SMM.
+ The function should return EFI_UNSUPPORTED if the hardware does not support
+ hiding of SMRAM. The function should return EFI_DEVICE_ERROR if the SMRAM
+ configuration is locked.
+
+ @param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.
+
+ @retval EFI_SUCCESS The operation was successful.
+ @retval EFI_UNSUPPORTED The system does not support opening and closing of
+ SMRAM.
+ @retval EFI_DEVICE_ERROR SMRAM cannot be opened, perhaps because it is
+ locked.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+SmmAccess2DxeOpen (
+ IN EFI_SMM_ACCESS2_PROTOCOL *This
+ )
+{
+ return SmramAccessOpen (&This->LockState, &This->OpenState);
+}
+
+/**
+ Inhibits access to the SMRAM.
+
+ This function "closes" SMRAM so that it is not visible while outside of SMM.
+ The function should return EFI_UNSUPPORTED if the hardware does not support
+ hiding of SMRAM.
+
+ @param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.
+
+ @retval EFI_SUCCESS The operation was successful.
+ @retval EFI_UNSUPPORTED The system does not support opening and closing of
+ SMRAM.
+ @retval EFI_DEVICE_ERROR SMRAM cannot be closed.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+SmmAccess2DxeClose (
+ IN EFI_SMM_ACCESS2_PROTOCOL *This
+ )
+{
+ return SmramAccessClose (&This->LockState, &This->OpenState);
+}
+
+/**
+ Inhibits access to the SMRAM.
+
+ This function prohibits access to the SMRAM region. This function is usually
+ implemented such that it is a write-once operation.
+
+ @param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.
+
+ @retval EFI_SUCCESS The device was successfully locked.
+ @retval EFI_UNSUPPORTED The system does not support locking of SMRAM.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+SmmAccess2DxeLock (
+ IN EFI_SMM_ACCESS2_PROTOCOL *This
+ )
+{
+ return SmramAccessLock (&This->LockState, &This->OpenState);
+}
+
+/**
+ Queries the memory controller for the possible regions that will support
+ SMRAM.
+
+ @param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.
+ @param[in,out] SmramMapSize A pointer to the size, in bytes, of the
+ SmramMemoryMap buffer.
+ @param[in,out] SmramMap A pointer to the buffer in which firmware
+ places the current memory map.
+
+ @retval EFI_SUCCESS The chipset supported the given resource.
+ @retval EFI_BUFFER_TOO_SMALL The SmramMap parameter was too small. The
+ current buffer size needed to hold the memory
+ map is returned in SmramMapSize.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+SmmAccess2DxeGetCapabilities (
+ IN CONST EFI_SMM_ACCESS2_PROTOCOL *This,
+ IN OUT UINTN *SmramMapSize,
+ IN OUT EFI_SMRAM_DESCRIPTOR *SmramMap
+ )
+{
+ return SmramAccessGetCapabilities (This->LockState, This->OpenState,
+ SmramMapSize, SmramMap);
+}
+
+//
+// LockState and OpenState will be filled in by the entry point.
+//
+STATIC EFI_SMM_ACCESS2_PROTOCOL mAccess2 = {
+ &SmmAccess2DxeOpen,
+ &SmmAccess2DxeClose,
+ &SmmAccess2DxeLock,
+ &SmmAccess2DxeGetCapabilities
+};
+
+//
+// Entry point of this driver.
+//
+EFI_STATUS
+EFIAPI
+SmmAccess2DxeEntryPoint (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ //
+ // This module should only be included if SMRAM support is required.
+ //
+ ASSERT (FeaturePcdGet (PcdSmmSmramRequire));
+
+ InitQ35TsegMbytes ();
+ GetStates (&mAccess2.LockState, &mAccess2.OpenState);
+
+ //
+ // SmramAccessLock() depends on "mQ35SmramAtDefaultSmbase"; init the latter
+ // just before exposing the former via EFI_SMM_ACCESS2_PROTOCOL.Lock().
+ //
+ InitQ35SmramAtDefaultSmbase ();
+
+ return gBS->InstallMultipleProtocolInterfaces (&ImageHandle,
+ &gEfiSmmAccess2ProtocolGuid, &mAccess2,
+ NULL);
+}
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