diff options
Diffstat (limited to 'MdeModulePkg/Universal/LegacyRegion2Dxe/LegacyRegion2.c')
| -rw-r--r-- | MdeModulePkg/Universal/LegacyRegion2Dxe/LegacyRegion2.c | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/LegacyRegion2Dxe/LegacyRegion2.c b/MdeModulePkg/Universal/LegacyRegion2Dxe/LegacyRegion2.c new file mode 100644 index 0000000000..80de38c484 --- /dev/null +++ b/MdeModulePkg/Universal/LegacyRegion2Dxe/LegacyRegion2.c @@ -0,0 +1,249 @@ +/** @file
+ Dummy implementation of Legacy Region 2 Protocol.
+
+ This generic implementation of the Legacy Region 2 Protocol does not actually
+ perform any lock/unlock operations. This module may be used on platforms
+ that do not provide HW locking of the legacy memory regions. It can also
+ be used as a template driver for implementing the Legacy Region 2 Protocol on
+ a platform that does support HW locking of the legacy memory regions.
+
+Copyright (c) 2009, Intel Corporation
+All rights reserved. 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 <LegacyRegion2.h>
+
+EFI_HANDLE mLegacyRegion2Handle = NULL;
+
+EFI_LEGACY_REGION2_PROTOCOL mLegacyRegion2 = {
+ LegacyRegion2Decode,
+ LegacyRegion2Lock,
+ LegacyRegion2BootLock,
+ LegacyRegion2Unlock,
+ LegacyRegionGetInfo
+};
+
+/**
+ Modify the hardware to allow (decode) or disallow (not decode) memory reads in a region.
+
+ If the On parameter evaluates to TRUE, this function enables memory reads in the address range
+ Start to (Start + Length - 1).
+ If the On parameter evaluates to FALSE, this function disables memory reads in the address range
+ Start to (Start + Length - 1).
+
+ @param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
+ @param Start[in] The beginning of the physical address of the region whose attributes
+ should be modified.
+ @param Length[in] The number of bytes of memory whose attributes should be modified.
+ The actual number of bytes modified may be greater than the number
+ specified.
+ @param Granularity[out] The number of bytes in the last region affected. This may be less
+ than the total number of bytes affected if the starting address
+ was not aligned to a region's starting address or if the length
+ was greater than the number of bytes in the first region.
+ @param On[in] Decode / Non-Decode flag.
+
+ @retval EFI_SUCCESS The region's attributes were successfully modified.
+ @retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyRegion2Decode (
+ IN EFI_LEGACY_REGION2_PROTOCOL *This,
+ IN UINT32 Start,
+ IN UINT32 Length,
+ OUT UINT32 *Granularity,
+ IN BOOLEAN *On
+ )
+{
+ ASSERT (Granularity != NULL);
+ *Granularity = 0;
+ return EFI_SUCCESS;
+}
+
+/**
+ Modify the hardware to disallow memory writes in a region.
+
+ This function changes the attributes of a memory range to not allow writes.
+
+ @param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
+ @param Start[in] The beginning of the physical address of the region whose
+ attributes should be modified.
+ @param Length[in] The number of bytes of memory whose attributes should be modified.
+ The actual number of bytes modified may be greater than the number
+ specified.
+ @param Granularity[out] The number of bytes in the last region affected. This may be less
+ than the total number of bytes affected if the starting address was
+ not aligned to a region's starting address or if the length was
+ greater than the number of bytes in the first region.
+
+ @retval EFI_SUCCESS The region's attributes were successfully modified.
+ @retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyRegion2Lock (
+ IN EFI_LEGACY_REGION2_PROTOCOL *This,
+ IN UINT32 Start,
+ IN UINT32 Length,
+ OUT UINT32 *Granularity
+ )
+{
+ ASSERT (Granularity != NULL);
+ *Granularity = 0;
+ return EFI_SUCCESS;
+}
+
+/**
+ Modify the hardware to disallow memory attribute changes in a region.
+
+ This function makes the attributes of a region read only. Once a region is boot-locked with this
+ function, the read and write attributes of that region cannot be changed until a power cycle has
+ reset the boot-lock attribute. Calls to Decode(), Lock() and Unlock() will have no effect.
+
+ @param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
+ @param Start[in] The beginning of the physical address of the region whose
+ attributes should be modified.
+ @param Length[in] The number of bytes of memory whose attributes should be modified.
+ The actual number of bytes modified may be greater than the number
+ specified.
+ @param Granularity[out] The number of bytes in the last region affected. This may be less
+ than the total number of bytes affected if the starting address was
+ not aligned to a region's starting address or if the length was
+ greater than the number of bytes in the first region.
+
+ @retval EFI_SUCCESS The region's attributes were successfully modified.
+ @retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
+ @retval EFI_UNSUPPORTED The chipset does not support locking the configuration registers in
+ a way that will not affect memory regions outside the legacy memory
+ region.
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyRegion2BootLock (
+ IN EFI_LEGACY_REGION2_PROTOCOL *This,
+ IN UINT32 Start,
+ IN UINT32 Length,
+ OUT UINT32 *Granularity
+ )
+{
+ ASSERT (Granularity != NULL);
+ *Granularity = 0;
+ return EFI_SUCCESS;
+}
+
+/**
+ Modify the hardware to allow memory writes in a region.
+
+ This function changes the attributes of a memory range to allow writes.
+
+ @param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
+ @param Start[in] The beginning of the physical address of the region whose
+ attributes should be modified.
+ @param Length[in] The number of bytes of memory whose attributes should be modified.
+ The actual number of bytes modified may be greater than the number
+ specified.
+ @param Granularity[out] The number of bytes in the last region affected. This may be less
+ than the total number of bytes affected if the starting address was
+ not aligned to a region's starting address or if the length was
+ greater than the number of bytes in the first region.
+
+ @retval EFI_SUCCESS The region's attributes were successfully modified.
+ @retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyRegion2Unlock (
+ IN EFI_LEGACY_REGION2_PROTOCOL *This,
+ IN UINT32 Start,
+ IN UINT32 Length,
+ OUT UINT32 *Granularity
+ )
+{
+ ASSERT (Granularity != NULL);
+ *Granularity = 0;
+ return EFI_SUCCESS;
+}
+
+/**
+ Get region information for the attributes of the Legacy Region.
+
+ This function is used to discover the granularity of the attributes for the memory in the legacy
+ region. Each attribute may have a different granularity and the granularity may not be the same
+ for all memory ranges in the legacy region.
+
+ @param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
+ @param DescriptorCount[out] The number of region descriptor entries returned in the Descriptor
+ buffer.
+ @param Descriptor[out] A pointer to a pointer used to return a buffer where the legacy
+ region information is deposited. This buffer will contain a list of
+ DescriptorCount number of region descriptors. This function will
+ provide the memory for the buffer.
+
+ @retval EFI_SUCCESS The region's attributes were successfully modified.
+ @retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyRegionGetInfo (
+ IN EFI_LEGACY_REGION2_PROTOCOL *This,
+ OUT UINT32 *DescriptorCount,
+ OUT EFI_LEGACY_REGION_DESCRIPTOR **Descriptor
+ )
+{
+ ASSERT (DescriptorCount != NULL);
+ ASSERT (Descriptor != NULL);
+
+ *DescriptorCount = 0;
+ *Descriptor = NULL;
+
+ return EFI_SUCCESS;
+}
+
+/**
+ The user Entry Point for module LegacyRegionDxe. The user code starts with this function.
+
+ @param[in] ImageHandle The firmware allocated handle for the EFI image.
+ @param[in] SystemTable A pointer to the EFI System Table.
+
+ @retval EFI_SUCCESS The entry point is executed successfully.
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyRegion2Install (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+
+ //
+ // Make sure the Legacy Region 2 Protocol is not already installed in the system
+ //
+ ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiLegacyRegion2ProtocolGuid);
+
+ //
+ // Install the protocol on a new handle.
+ //
+ Status = gBS->InstallMultipleProtocolInterfaces (
+ &mLegacyRegion2Handle,
+ &gEfiLegacyRegion2ProtocolGuid, &mLegacyRegion2,
+ NULL
+ );
+ ASSERT_EFI_ERROR (Status);
+
+ return EFI_SUCCESS;
+}
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