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MdePkg /IoRemappingTable: Define additional IORT SMMUv3 node flags. 

The flag for HTTU override in an SMMUv3 node in the IORT table is
defined in MdePkg/Include/IndustryStandard/IoRemappingTable.h as
a single bit. BIT0 or BIT1. The implementation of this field is
actually two bits, with the following mapings:

0b0000: Hardware update of the Access flag and dirty state are not
supported.
0b0001: Support for hardware update of the Access flag for Block and
Page descriptors.
0b0010: As 0b0001, and adds support for hardware update of the Access
flag for Block and Page descriptors. Hardware update of dirty state is
supported.

Referenced in Arm® System Memory Management Unit Architecture Specification
SMMU architecture version 3:
https://documentation-service.arm.com/static/63d7a2d5e4378a55c5e045b9

Signed-off-by: Aaron Pop <aaronpop@microsoft.com>
This commit is contained in:
joe 2023-07-24 10:19:22 -07:00 committed by mergify[bot]
parent 159f1aee56
commit 5ff99e0dab
1 changed files with 2 additions and 1 deletions
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3
MdePkg/Include/IndustryStandard/IoRemappingTable.h
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@ -61,7 +61,8 @@
#define EFI_ACPI_IORT_SMMUv1v2_INT_FLAG_EDGE 0x1
#define EFI_ACPI_IORT_SMMUv3_FLAG_COHAC_OVERRIDE BIT0
#define EFI_ACPI_IORT_SMMUv3_FLAG_HTTU_OVERRIDE BIT1
#define EFI_ACPI_IORT_SMMUv3_FLAG_HTTU_OVERRIDE BIT1 // HW update of Access Flag supported
#define EFI_ACPI_IORT_SMMUv3_FLAG_HTTU_OVERRIDE_DS BIT2 // HW update of Access Flag + Dirty Flag supported
#define EFI_ACPI_IORT_SMMUv3_FLAG_PROXIMITY_DOMAIN BIT3
#define EFI_ACPI_IORT_SMMUv3_FLAG_DEVICEID_VALID BIT4