[edk2-devel] [PATCH v2 01/11] MdePkg: MADT: Add Online capable flag in GICC

Sami Mujawar posted 11 patches 9 months, 2 weeks ago
There is a newer version of this series
[edk2-devel] [PATCH v2 01/11] MdePkg: MADT: Add Online capable flag in GICC
Posted by Sami Mujawar 9 months, 2 weeks ago
Bugzilla: 3706 'Code First - MADT GICC new flags'

On ARM systems physical CPU hotplug is not supported.
All CPUs are considered present and this is true
throughout the system uptime.

The ECR 2285 introduces a new 'online-capable' flag
in the GICC structure flags in ACPI 6.5, to signal
firmware policy (CPU is not enabled but it can be
enabled and onlined). This enables OSPM to support
virtual CPU hotplug (on virtual platforms for

This ECR also updates the MADT table revision to 6
to reflect the ACPI 6.5 changes. Therefore, update
the MADT table revision to match the value as
specified in ACPI 6.5.

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>

     - No code change from v1 patch series.      [SAMI]

 MdePkg/Include/IndustryStandard/Acpi65.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/MdePkg/Include/IndustryStandard/Acpi65.h b/MdePkg/Include/IndustryStandard/Acpi65.h
index 6caadf2404984aa472f748293b8e80dd120f280c..9e2828bc048bcd9b2bf0529d00bdaf8bf04bf543 100644
--- a/MdePkg/Include/IndustryStandard/Acpi65.h
+++ b/MdePkg/Include/IndustryStandard/Acpi65.h
@@ -2,7 +2,7 @@
   ACPI 6.5 definitions from the ACPI Specification Revision 6.5 Aug, 2022.
   Copyright (c) 2017 - 2022, Intel Corporation. All rights reserved.<BR>
-  Copyright (c) 2019 - 2021, ARM Ltd. All rights reserved.<BR>
+  Copyright (c) 2019 - 2023, ARM Ltd. All rights reserved.<BR>
   Copyright (c) 2023, Loongson Technology Corporation Limited. All rights reserved.<BR>
   SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -533,6 +533,7 @@ typedef struct {
 #define EFI_ACPI_6_5_GIC_ENABLED                            BIT0
+#define EFI_ACPI_6_5_GIC_ONLINE_CAPABLE                     BIT3
 /// GIC Distributor Structure

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