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04c36d5a1b
This patch refines the SmmAccess implementation: 1. SmramMap will be retrieved from the gEfiSmmSmramMemoryGuid instead of original from the TSEG Memory Base register. 2. Remove the gEfiAcpiVariableGuid creation, thus the DESCRIPTOR_INDEX definition can be also cleaned. 3. The gEfiAcpiVariableGuid HOB is moved to the OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf. Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Ray Ni <ray.ni@intel.com> Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com> Tested-by: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Jiewen Yao <Jiewen.yao@intel.com>
92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
/** @file
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Functions and types shared by the SMM accessor PEI and DXE modules.
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Copyright (C) 2015, Red Hat, Inc.
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Copyright (c) 2024 Intel Corporation.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Pi/PiMultiPhase.h>
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#include <Guid/SmramMemoryReserve.h>
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#include <Library/HobLib.h>
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//
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// The value of PcdQ35TsegMbytes is saved into this variable at module startup.
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//
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extern UINT16 mQ35TsegMbytes;
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/**
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Save PcdQ35TsegMbytes into mQ35TsegMbytes.
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**/
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VOID
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InitQ35TsegMbytes (
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VOID
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);
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/**
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Save PcdQ35SmramAtDefaultSmbase into mQ35SmramAtDefaultSmbase.
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**/
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VOID
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InitQ35SmramAtDefaultSmbase (
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VOID
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);
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/**
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Read the MCH_SMRAM and ESMRAMC registers, and update the LockState and
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OpenState fields in the PEI_SMM_ACCESS_PPI / EFI_SMM_ACCESS2_PROTOCOL object,
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from the D_LCK and T_EN bits.
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PEI_SMM_ACCESS_PPI and EFI_SMM_ACCESS2_PROTOCOL member functions can rely on
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the LockState and OpenState fields being up-to-date on entry, and they need
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to restore the same invariant on exit, if they touch the bits in question.
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@param[out] LockState Reflects the D_LCK bit on output; TRUE iff SMRAM is
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locked.
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@param[out] OpenState Reflects the inverse of the T_EN bit on output; TRUE
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iff SMRAM is open.
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**/
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VOID
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GetStates (
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OUT BOOLEAN *LockState,
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OUT BOOLEAN *OpenState
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);
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//
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// The functions below follow the PEI_SMM_ACCESS_PPI and
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// EFI_SMM_ACCESS2_PROTOCOL member declarations. The PeiServices and This
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// pointers are removed (TSEG doesn't depend on them), and so is the
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// DescriptorIndex parameter (TSEG doesn't support range-wise locking).
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//
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// The LockState and OpenState members that are common to both
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// PEI_SMM_ACCESS_PPI and EFI_SMM_ACCESS2_PROTOCOL are taken and updated in
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// isolation from the rest of the (non-shared) members.
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//
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EFI_STATUS
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SmramAccessOpen (
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OUT BOOLEAN *LockState,
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OUT BOOLEAN *OpenState
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);
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EFI_STATUS
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SmramAccessClose (
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OUT BOOLEAN *LockState,
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OUT BOOLEAN *OpenState
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);
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EFI_STATUS
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SmramAccessLock (
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OUT BOOLEAN *LockState,
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IN OUT BOOLEAN *OpenState
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);
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EFI_STATUS
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SmramAccessGetCapabilities (
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IN OUT UINTN *SmramMapSize,
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IN OUT EFI_SMRAM_DESCRIPTOR *SmramMap
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);
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