f211292711
Xen and bhyve are placing ACPI tables into system memory. So, they can share the same code. Therefore, create a new library which searches and installs ACPI tables from system memory. Signed-off-by: Corvin Köhne <corvink@FreeBSD.org> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com>
68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/** @file
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OVMF ACPI support
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Copyright (C) 2021, Red Hat, Inc.
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Copyright (c) 2008 - 2012, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2012, Bei Guan <gbtju85@gmail.com>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/AcpiPlatformLib.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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EFI_STATUS
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EFIAPI
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GetAcpiRsdpFromMemory (
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IN UINTN StartAddress,
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IN UINTN EndAddress,
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OUT EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER **RsdpPtr
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)
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{
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EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER *RsdpStructurePtr;
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UINT8 *AcpiPtr;
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UINT8 Sum;
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for (AcpiPtr = (UINT8 *)StartAddress;
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AcpiPtr < (UINT8 *)EndAddress;
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AcpiPtr += 0x10)
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{
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RsdpStructurePtr = (EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER *)
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(UINTN)AcpiPtr;
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if (!AsciiStrnCmp ((CHAR8 *)&RsdpStructurePtr->Signature, "RSD PTR ", 8)) {
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//
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// RSDP ACPI 1.0 checksum for 1.0/2.0/3.0 table.
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// This is only the first 20 bytes of the structure
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//
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Sum = CalculateSum8 (
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(CONST UINT8 *)RsdpStructurePtr,
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sizeof (EFI_ACPI_1_0_ROOT_SYSTEM_DESCRIPTION_POINTER)
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);
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if (Sum != 0) {
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return EFI_ABORTED;
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}
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if (RsdpStructurePtr->Revision >= 2) {
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//
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// RSDP ACPI 2.0/3.0 checksum, this is the entire table
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//
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Sum = CalculateSum8 (
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(CONST UINT8 *)RsdpStructurePtr,
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sizeof (EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER)
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);
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if (Sum != 0) {
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return EFI_ABORTED;
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}
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}
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*RsdpPtr = RsdpStructurePtr;
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return EFI_SUCCESS;
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}
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}
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return EFI_NOT_FOUND;
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}
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