From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Thu, 18 Feb 2016 19:51:08 +0000 (+0100)
Subject: ArmVirtPkg/ArmVirtQemu: limit ACPI support to v5.0 and higher
X-Git-Tag: edk2-stable201903~7815
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=e0692789058ee2c0099f88852503c16dbb0bae4e

ArmVirtPkg/ArmVirtQemu: limit ACPI support to v5.0 and higher

The ACPI spec predates the AARCH64 architecture by 5 versions, so there
is no point in supporting anything below v5.0. So set the PCD that
controls the ACPI table generation to the appropriate value.

Note that the current consumers of this PCD only check whether bit 1
is set or not (i.e., ACPI v1.0b), but this may change in the future,
so let's choose a meaningful value right away.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
---

diff --git a/ArmVirtPkg/ArmVirtQemu.dsc b/ArmVirtPkg/ArmVirtQemu.dsc
index 113ac3d880..f873883c4a 100644
--- a/ArmVirtPkg/ArmVirtQemu.dsc
+++ b/ArmVirtPkg/ArmVirtQemu.dsc
@@ -177,6 +177,10 @@
   # point only, for entry point versions >= 3.0.
   gEfiMdeModulePkgTokenSpaceGuid.PcdSmbiosEntryPointProvideMethod|0x2
 
+  # ACPI predates the AARCH64 architecture by 5 versions, so
+  # we only target OSes that support ACPI v5.0 or later
+  gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiExposedTableVersions|0x20
+
 [PcdsDynamicDefault.common]
   ## If TRUE, OvmfPkg/AcpiPlatformDxe will not wait for PCI
   #  enumeration to complete before installing ACPI tables.