diff options
Diffstat (limited to 'Silicon/BroxtonSoC/BroxtonSiPkg/Cpu/SmmAccess/Pei/SmmAccessDriver.c')
| -rw-r--r-- | Silicon/BroxtonSoC/BroxtonSiPkg/Cpu/SmmAccess/Pei/SmmAccessDriver.c | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/Silicon/BroxtonSoC/BroxtonSiPkg/Cpu/SmmAccess/Pei/SmmAccessDriver.c b/Silicon/BroxtonSoC/BroxtonSiPkg/Cpu/SmmAccess/Pei/SmmAccessDriver.c new file mode 100644 index 0000000000..6341f8eb78 --- /dev/null +++ b/Silicon/BroxtonSoC/BroxtonSiPkg/Cpu/SmmAccess/Pei/SmmAccessDriver.c @@ -0,0 +1,292 @@ +/** @file
+ This is the driver that publishes the SMM Access Protocol
+ instance for System Agent.
+
+ Copyright (c) 1999 - 2016, Intel Corporation. All rights reserved.<BR>
+
+ This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php.
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "SmmAccessDriver.h"
+
+
+/**
+ This is the constructor for the SMM Access Ppi
+
+ @param[in] FileHandle FileHandle.
+ @param[in] PeiServices General purpose services available to every PEIM.
+
+ @retval EFI_SUCCESS Protocol successfully started and installed
+ @retval EFI_UNSUPPORTED Protocol can't be started
+
+**/
+EFI_STATUS
+EFIAPI
+SmmAccessDriverEntryPoint (
+ IN EFI_PEI_FILE_HANDLE FileHandle,
+ IN CONST EFI_PEI_SERVICES **PeiServices
+ )
+{
+ EFI_STATUS Status;
+ UINTN Index;
+ EFI_SMRAM_HOB_DESCRIPTOR_BLOCK *DescriptorBlock;
+ SMM_ACCESS_PRIVATE_DATA *SmmAccessPrivate;
+ EFI_PEI_PPI_DESCRIPTOR *PpiList;
+ EFI_PEI_HOB_POINTERS HobList;
+
+ //
+ // Initialize private data
+ //
+ Status = (**PeiServices).AllocatePool (
+ PeiServices,
+ sizeof (*SmmAccessPrivate),
+ (VOID **) &SmmAccessPrivate
+ );
+ ASSERT_EFI_ERROR (Status);
+
+ Status = (**PeiServices).AllocatePool (
+ PeiServices,
+ sizeof (*PpiList),
+ (VOID **) &PpiList
+ );
+ ASSERT_EFI_ERROR (Status);
+
+ //
+ // Build SMM related information
+ //
+ SmmAccessPrivate->Signature = SMM_ACCESS_PRIVATE_DATA_SIGNATURE;
+
+ //
+ // Get Hob list
+ //
+ HobList.Raw = GetFirstGuidHob (&gEfiSmmPeiSmramMemoryReserveGuid);
+ ASSERT(HobList.Raw != NULL);
+ DescriptorBlock = GET_GUID_HOB_DATA (HobList.Raw);
+ if (DescriptorBlock == NULL) {
+ ASSERT (FALSE);
+ return EFI_NOT_FOUND;
+ }
+
+ //
+ // Use the hob to publish SMRAM capabilities
+ //
+ ASSERT (DescriptorBlock->NumberOfSmmReservedRegions <= MAX_SMRAM_RANGES);
+ for (Index = 0; Index < DescriptorBlock->NumberOfSmmReservedRegions; Index++) {
+ SmmAccessPrivate->SmramDesc[Index].PhysicalStart = DescriptorBlock->Descriptor[Index].PhysicalStart;
+ SmmAccessPrivate->SmramDesc[Index].CpuStart = DescriptorBlock->Descriptor[Index].CpuStart;
+ SmmAccessPrivate->SmramDesc[Index].PhysicalSize = DescriptorBlock->Descriptor[Index].PhysicalSize;
+ SmmAccessPrivate->SmramDesc[Index].RegionState = DescriptorBlock->Descriptor[Index].RegionState;
+ }
+
+ SmmAccessPrivate->NumberRegions = Index;
+ SmmAccessPrivate->SmmAccess.Open = Open;
+ SmmAccessPrivate->SmmAccess.Close = Close;
+ SmmAccessPrivate->SmmAccess.Lock = Lock;
+ SmmAccessPrivate->SmmAccess.GetCapabilities = GetCapabilities;
+ SmmAccessPrivate->SmmAccess.LockState = FALSE;
+ SmmAccessPrivate->SmmAccess.OpenState = FALSE;
+
+ PpiList->Flags = (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST);
+ PpiList->Guid = &gPeiSmmAccessPpiGuid;
+ PpiList->Ppi = &SmmAccessPrivate->SmmAccess;
+
+ Status = (**PeiServices).InstallPpi (PeiServices, PpiList);
+ ASSERT_EFI_ERROR (Status);
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ This routine accepts a request to "open" a region of SMRAM. The
+ region could be legacy ABSEG, HSEG, or TSEG near top of physical memory.
+ The use of "open" means that the memory is visible from all PEIM
+ and SMM agents.
+
+ @param[in] PeiServices General purpose services available to every PEIM
+ @param[in] This Pointer to the SMM Access Interface
+ @param[in] DescriptorIndex Region of SMRAM to Open
+
+ @retval EFI_SUCCESS The region was successfully opened.
+ @retval EFI_DEVICE_ERROR The region could not be opened because locked by chipset.
+ @retval EFI_INVALID_PARAMETER The descriptor index was out of bounds.
+
+**/
+EFI_STATUS
+EFIAPI
+Open (
+ IN EFI_PEI_SERVICES **PeiServices,
+ IN PEI_SMM_ACCESS_PPI *This,
+ IN UINTN DescriptorIndex
+ )
+{
+ SMM_ACCESS_PRIVATE_DATA *SmmAccess;
+
+ SmmAccess = SMM_ACCESS_PRIVATE_DATA_FROM_THIS (This);
+
+ if (DescriptorIndex >= SmmAccess->NumberRegions) {
+ DEBUG (( EFI_D_ERROR, "SMRAM region out of range\n"));
+ return EFI_INVALID_PARAMETER;
+ } else if (SmmAccess->SmramDesc[DescriptorIndex].RegionState & EFI_SMRAM_LOCKED) {
+ DEBUG ((EFI_D_ERROR, "Cannot open a locked SMRAM region\n"));
+ return EFI_DEVICE_ERROR;
+ }
+
+
+ Mmio64AndThenOr (MCH_BASE_ADDRESS, 0x6840, 0, 0xFF);
+ Mmio64AndThenOr (MCH_BASE_ADDRESS, 0x6848, 0, 0xFF);
+
+ //
+ // END CHIPSET SPECIFIC CODE
+ //
+ SmmAccess->SmramDesc[DescriptorIndex].RegionState &= ~(EFI_SMRAM_CLOSED | EFI_ALLOCATED);
+ SmmAccess->SmramDesc[DescriptorIndex].RegionState |= EFI_SMRAM_OPEN;
+ SmmAccess->SmmAccess.OpenState = TRUE;
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ This routine accepts a request to "close" a region of SMRAM. This is valid for
+ compatible SMRAM region.
+
+ @param[in] PeiServices General purpose services available to every PEIM
+ @param[in] This Pointer to the SMM Access Interface
+ @param[in] DescriptorIndex Region of SMRAM to Close
+
+ @retval EFI_SUCCESS The region was successfully closed.
+ @retval EFI_DEVICE_ERROR The region could not be closed because locked by chipset.
+ @retval EFI_INVALID_PARAMETER The descriptor index was out of bounds.
+
+**/
+EFI_STATUS
+EFIAPI
+Close (
+ IN EFI_PEI_SERVICES **PeiServices,
+ IN PEI_SMM_ACCESS_PPI *This,
+ IN UINTN DescriptorIndex
+ )
+{
+ SMM_ACCESS_PRIVATE_DATA *SmmAccess;
+
+ SmmAccess = SMM_ACCESS_PRIVATE_DATA_FROM_THIS (This);
+
+ if (DescriptorIndex >= SmmAccess->NumberRegions) {
+ DEBUG ((EFI_D_ERROR, "SMRAM region out of range\n"));
+ return EFI_INVALID_PARAMETER;
+ } else if (SmmAccess->SmramDesc[DescriptorIndex].RegionState & EFI_SMRAM_LOCKED) {
+ DEBUG ((EFI_D_ERROR, "Cannot close a locked SMRAM region\n"));
+ return EFI_DEVICE_ERROR;
+ }
+ if (SmmAccess->SmramDesc[DescriptorIndex].RegionState & EFI_SMRAM_CLOSED) {
+ return EFI_DEVICE_ERROR;
+ }
+
+ SmmAccess->SmramDesc[DescriptorIndex].RegionState &= ~EFI_SMRAM_OPEN;
+ SmmAccess->SmramDesc[DescriptorIndex].RegionState |= (EFI_SMRAM_CLOSED | EFI_ALLOCATED);
+
+ SmmAccess->SmmAccess.OpenState = FALSE;
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ This routine accepts a request to "lock" SMRAM. The
+ region could be legacy AB or TSEG near top of physical memory.
+ The use of "lock" means that the memory can no longer be opened
+ to PEIM.
+
+ @param[in] PeiServices General purpose services available to every PEIM.
+ @param[in] This Pointer to the SMM Access Interface.
+ @param[in] DescriptorIndex Region of SMRAM to Lock.
+
+ @retval EFI_SUCCESS The region was successfully locked.
+ @retval EFI_DEVICE_ERROR The region could not be locked because at least one range is still open.
+ @retval EFI_INVALID_PARAMETER The descriptor index was out of bounds.
+
+**/
+EFI_STATUS
+EFIAPI
+Lock (
+ IN EFI_PEI_SERVICES **PeiServices,
+ IN PEI_SMM_ACCESS_PPI *This,
+ IN UINTN DescriptorIndex
+ )
+{
+ SMM_ACCESS_PRIVATE_DATA *SmmAccess;
+
+ SmmAccess = SMM_ACCESS_PRIVATE_DATA_FROM_THIS (This);
+
+ if (DescriptorIndex >= SmmAccess->NumberRegions) {
+ DEBUG ((EFI_D_ERROR, "SMRAM region out of range\n"));
+ return EFI_INVALID_PARAMETER;
+ } else if (SmmAccess->SmmAccess.OpenState) {
+ DEBUG ((EFI_D_ERROR, "Cannot lock SMRAM when SMRAM regions are still open\n"));
+ return EFI_DEVICE_ERROR;
+ }
+
+ Mmio64AndThenOr (MCH_BASE_ADDRESS, 0x6838, 0, 0x00);
+
+ SmmAccess->SmramDesc[DescriptorIndex].RegionState |= EFI_SMRAM_LOCKED;
+ SmmAccess->SmmAccess.LockState = TRUE;
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ This routine services a user request to discover the SMRAM
+ capabilities of this platform. This will report the possible
+ ranges that are possible for SMRAM access, based upon the
+ memory controller capabilities.
+
+ @param[in] PeiServices General purpose services available to every PEIM.
+ @param[in] This Pointer to the SMRAM Access Interface.
+ @param[in, out] SmramMapSize Pointer to the variable containing size of the
+ buffer to contain the description information.
+ @param[in, out] SmramMap Buffer containing the data describing the Smram
+ region descriptors.
+
+ @retval EFI_BUFFER_TOO_SMALL The user did not provide a sufficient buffer.
+ @retval EFI_SUCCESS The user provided a sufficiently-sized buffer.
+
+**/
+EFI_STATUS
+EFIAPI
+GetCapabilities (
+ IN EFI_PEI_SERVICES **PeiServices,
+ IN PEI_SMM_ACCESS_PPI *This,
+ IN OUT UINTN *SmramMapSize,
+ IN OUT EFI_SMRAM_DESCRIPTOR *SmramMap
+ )
+{
+ EFI_STATUS Status;
+ SMM_ACCESS_PRIVATE_DATA *SmmAccess;
+ UINTN BufferSize;
+
+ SmmAccess = SMM_ACCESS_PRIVATE_DATA_FROM_THIS (This);
+ BufferSize = SmmAccess->NumberRegions * sizeof (EFI_SMRAM_DESCRIPTOR);
+
+ if (*SmramMapSize < BufferSize) {
+ if (*SmramMapSize != 0) {
+ DEBUG((EFI_D_ERROR, "SMRAM Map Buffer too small\n"));
+ }
+ Status = EFI_BUFFER_TOO_SMALL;
+ } else {
+ CopyMem (SmramMap, SmmAccess->SmramDesc, *SmramMapSize);
+ Status = EFI_SUCCESS;
+ }
+ *SmramMapSize = BufferSize;
+
+ return Status;
+}
+
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