65a69b2148
The presence of this GUID in the PPI database, and/or in the DXE protocol database (as dictated by the platform's needs in these firmware phases) implies that the platform provides the operating system with a Device Tree-based hardware description. This is not necessarily exclusive with other types of hardware description (for example, an ACPI-based one). A platform PEIM and/or DXE driver is supposed to produce a single instance of the PPI and/or protocol (with NULL contents), if appropriate. The decision to produce the PPI and/or protocol is platform specific; for example, in the DXE phase, it could depend on an HII checkbox / underlying non-volatile UEFI variable. In the DXE phase, the protocol is meant to be consumed by the platform driver that - owns the Device Tree description of the hardware, and - is responsible for installing it as a system configuration table. Said FDT-owner driver can wait for the protocol via DEPEX or protocol notify. Because this GUID is not standard, it is prefixed with EDKII / Edkii, as seen elsewhere (for example in MdeModulePkg and SecurityPkg). Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Leif Lindholm <leif.lindholm@linaro.org> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
36 lines
1.3 KiB
C
36 lines
1.3 KiB
C
/** @file
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EDKII Platform Has Device Tree GUID
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A NULL protocol instance with this GUID in the DXE protocol database, and/or
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a NULL PPI with this GUID in the PPI database, implies that the platform
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provides the operating system with a Device Tree-based hardware description.
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Note that this is not necessarily exclusive with different kinds of hardware
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description (for example, an ACPI-based one). A platform driver and/or PEIM
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is supposed to produce a single instance of the protocol and/or PPI (with
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NULL contents), if appropriate.
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Copyright (C) 2017, Red Hat, Inc.
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License that accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
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WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef __EDKII_PLATFORM_HAS_DEVICE_TREE_H__
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#define __EDKII_PLATFORM_HAS_DEVICE_TREE_H__
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#define EDKII_PLATFORM_HAS_DEVICE_TREE_GUID \
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{ \
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0x7ebb920d, 0x1aaf, 0x46d9, \
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{ 0xb2, 0xaf, 0x54, 0x1e, 0x1d, 0xce, 0x14, 0x8b } \
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}
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extern EFI_GUID gEdkiiPlatformHasDeviceTreeGuid;
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#endif
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