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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275 Use the MemEncryptSevClearMmioPageEncMask() to clear memory encryption mask for the Mmio address range. Cc: James Bottomley <jejb@linux.ibm.com> Cc: Min Xu <min.m.xu@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Erdem Aktas <erdemaktas@google.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Message-Id: <20210519181949.6574-12-brijesh.singh@amd.com>
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/** @file
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Define the module hooks used while probing the QEMU flash device.
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Copyright (C) 2018, Advanced Micro Devices. All rights reserved.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/PcdLib.h>
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#include <Library/MemEncryptSevLib.h>
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#include "QemuFlash.h"
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VOID
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QemuFlashBeforeProbe (
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINTN FdBlockSize,
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IN UINTN FdBlockCount
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)
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{
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EFI_STATUS Status;
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ASSERT (FeaturePcdGet (PcdSmmSmramRequire));
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if (!MemEncryptSevIsEnabled ()) {
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return;
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}
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//
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// When SEV is enabled, AmdSevDxe runs early in DXE phase and clears the
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// C-bit from the NonExistent entry -- which is later split and accommodate
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// the flash MMIO but the driver runs in non SMM context hence it cleared the
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// flash ranges from non SMM page table. When SMM is enabled, the flash
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// services are accessed from the SMM mode hence we explicitly clear the
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// C-bit on flash ranges from SMM page table.
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//
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Status = MemEncryptSevClearMmioPageEncMask (
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0,
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BaseAddress,
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EFI_SIZE_TO_PAGES (FdBlockSize * FdBlockCount)
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);
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ASSERT_EFI_ERROR (Status);
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}
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/**
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Write to QEMU Flash
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@param[in] Ptr Pointer to the location to write.
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@param[in] Value The value to write.
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**/
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VOID
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QemuFlashPtrWrite (
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IN volatile UINT8 *Ptr,
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IN UINT8 Value
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)
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{
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*Ptr = Value;
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}
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