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Last change
on this file since 89916 was 80721, checked in by vboxsync, 6 years ago |
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Devices/EFI/FirmwareNew: Start upgrade process to edk2-stable201908 (compiles on Windows and works to some extent), bugref:4643
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File size:
618 bytes
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| 1 | /** @file
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| 2 | SpeculationBarrier() function for IA32 and x64.
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| 3 |
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| 4 | Copyright (C) 2018 - 2019, Intel Corporation. All rights reserved.<BR>
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| 5 |
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| 6 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 7 |
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| 8 | **/
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| 9 |
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| 10 | #include <Library/BaseLib.h>
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| 11 |
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| 12 | /**
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| 13 | Uses as a barrier to stop speculative execution.
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| 14 |
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| 15 | Ensures that no later instruction will execute speculatively, until all prior
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| 16 | instructions have completed.
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| 17 |
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| 18 | **/
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| 19 | VOID
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| 20 | EFIAPI
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| 21 | SpeculationBarrier (
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| 22 | VOID
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| 23 | )
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| 24 | {
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| 25 | if (PcdGet8 (PcdSpeculationBarrierType) == 0x01) {
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| 26 | AsmLfence ();
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| 27 | } else if (PcdGet8 (PcdSpeculationBarrierType) == 0x02) {
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| 28 | AsmCpuid (0x01, NULL, NULL, NULL, NULL);
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| 29 | }
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| 30 | }
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