MdeModulePkg: AcpiTableDxe: make 4 GB table allocation limit optional

AARCH64 systems never require compatibility with legacy ACPI OSes, and
may not have any 32-bit addressable system RAM. To support ACPI on these
systems, we need to be able to relax the 4 GB allocation restriction.

So add a PCD PcdAcpiExposedTableVersions containing a bitmask describing
which ACPI versions are targeted, and wire it up it up to the memory
allocation calls in AcpiTableDxe/AcpiTableProtocol.c. I.e., if ACPI v1.0b
is not among the supported versions, the memory allocations are not limited
to 4 GB, and only table types that carry 64-bit addresses are emitted.

Note that this will inhibit the publishing of any tables that carry only
32-bit addresses, i.e., RSDPv1, RSDTv1 and RSDTv3.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: "Yao, Jiewen" <jiewen.yao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
This commit is contained in:
Ard Biesheuvel
2016-02-17 15:37:58 +01:00
parent 0d4a6c3dfc
commit f9bbb8d9c3
4 changed files with 270 additions and 181 deletions

View File

@@ -2,6 +2,7 @@
# ACPI Table Protocol Driver
#
# Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
# Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
# This program and the accompanying materials are
# licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution. The full text of the license may be found at
@@ -67,6 +68,7 @@
gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultOemRevision ## CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultCreatorId ## CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultCreatorRevision ## CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiExposedTableVersions ## CONSUMES
[Protocols]
gEfiAcpiTableProtocolGuid ## PRODUCES