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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3168 This interface provides an abstration layer to allow MM modules to access requested areas that are outside of MMRAM. On MM model that blocks all non-MMRAM accesses, areas requested through this API will be mapped or unblocked for accessibility inside MM environment. For MM modules that need to access regions outside of MMRAMs, the agents that set up these regions are responsible for invoking this API in order for these memory areas to be accessible from inside MM. Example usages: 1. To enable runtime cache feature for variable service, Variable MM module will need to access the allocated runtime buffer. Thus the agent sets up these buffers, VariableSmmRuntimeDxe, will need to invoke this API to make these regions accessible by Variable MM. 2. For TPM ACPI table to communicate to physical presence handler, the corresponding NVS region has to be accessible from inside MM. Once the NVS region are assigned, it needs to be unblocked thourgh this API. Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Zhiguang Liu <zhiguang.liu@intel.com> Cc: Hao A Wu <hao.a.wu@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Kun Qin <kun.q@outlook.com> Acked-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn> Message-Id: <MWHPR06MB31028AF0D0785B93E4E7CF63F3969@MWHPR06MB3102.namprd06.prod.outlook.com>
45 lines
1.8 KiB
C
45 lines
1.8 KiB
C
/** @file
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MM Unblock Memory Library Interface.
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This library provides an interface to request non-MMRAM pages to be mapped/unblocked
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from inside MM environment.
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For MM modules that need to access regions outside of MMRAMs, the agents that set up
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these regions are responsible for invoking this API in order for these memory areas
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to be accessed from inside MM.
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Copyright (c) Microsoft Corporation.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef MM_UNBLOCK_MEMORY_LIB_H_
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#define MM_UNBLOCK_MEMORY_LIB_H_
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/**
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This API provides a way to unblock certain data pages to be accessible inside MM environment.
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@param UnblockAddress The address of buffer caller requests to unblock, the address
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has to be page aligned.
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@param NumberOfPages The number of pages requested to be unblocked from MM
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environment.
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@retval RETURN_SUCCESS The request goes through successfully.
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@retval RETURN_NOT_AVAILABLE_YET The requested functionality is not produced yet.
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@retval RETURN_UNSUPPORTED The requested functionality is not supported on current platform.
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@retval RETURN_SECURITY_VIOLATION The requested address failed to pass security check for
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unblocking.
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@retval RETURN_INVALID_PARAMETER Input address either NULL pointer or not page aligned.
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@retval RETURN_ACCESS_DENIED The request is rejected due to system has passed certain boot
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phase.
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**/
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RETURN_STATUS
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EFIAPI
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MmUnblockMemoryRequest (
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IN PHYSICAL_ADDRESS UnblockAddress,
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IN UINT64 NumberOfPages
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);
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#endif // MM_UNBLOCK_MEMORY_LIB_H_
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