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 113ac3d880d4f3b18c5a6ac417bccc587a7cba82..f873883c4a3981b647567f48955d6dea00d84c1f 100644 (file)
--- a/ArmVirtPkg/ArmVirtQemu.dsc
+++ b/ArmVirtPkg/ArmVirtQemu.dsc
@@ -177,6 +177,10 @@
   # point only, for entry point versions >= 3.0.\r
   gEfiMdeModulePkgTokenSpaceGuid.PcdSmbiosEntryPointProvideMethod|0x2\r
 \r
   # point only, for entry point versions >= 3.0.\r
   gEfiMdeModulePkgTokenSpaceGuid.PcdSmbiosEntryPointProvideMethod|0x2\r
 \r

+  # ACPI predates the AARCH64 architecture by 5 versions, so\r
+  # we only target OSes that support ACPI v5.0 or later\r
+  gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiExposedTableVersions|0x20\r
+\r

 [PcdsDynamicDefault.common]\r
   ## If TRUE, OvmfPkg/AcpiPlatformDxe will not wait for PCI\r
   #  enumeration to complete before installing ACPI tables.\r
 [PcdsDynamicDefault.common]\r
   ## If TRUE, OvmfPkg/AcpiPlatformDxe will not wait for PCI\r
   #  enumeration to complete before installing ACPI tables.\r