6e2543b01d
After reviewing OvmfPkg's use of its own QemuFwCfgLib instances, it is clear that its only pre-DXE fw_cfg dependency concerns S3 support (the QemuFwCfgS3Enabled() call in "PlatformPei/Platform.c"). For ARM guests, S3 is in the distant future, but we can see several shorter term applications for fw_cfg that all reside in DXE: - controlling boot order (to be implemented in PlatformBdsLib for Intel BDS), - supporting -kernel / -initrd / -append boot on QEMU (to be implemented in PlatformBdsLib for Intel BDS, similarly), - loading and linking ACPI tables, - installing SMBIOS tables. Therefore it makes sense to add a simple MMIO-based fw_cfg client library to ArmVirtualizationPkg that for the moment is only available to DXE_DRIVER modules. Because MMIO accesses are costly on KVM/ARM, InternalQemuFwCfgReadBytes() accesses the fw_cfg data register in full words. This speeds up transfers almost linearly. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16567 6f19259b-4bc3-4df7-8a09-765794883524
53 lines
1.5 KiB
INI
53 lines
1.5 KiB
INI
## @file
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#
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# Stateful, implicitly initialized fw_cfg library.
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#
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# Copyright (C) 2013 - 2014, Red Hat, Inc.
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# Copyright (c) 2008 - 2012, Intel Corporation. All rights reserved.<BR>
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#
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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 which 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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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR
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# IMPLIED.
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#
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##
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[Defines]
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INF_VERSION = 0x00010005
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BASE_NAME = QemuFwCfgLib
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FILE_GUID = B271F41F-B841-48A9-BA8D-545B4BC2E2BF
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MODULE_TYPE = BASE
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VERSION_STRING = 1.0
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LIBRARY_CLASS = QemuFwCfgLib|DXE_DRIVER
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CONSTRUCTOR = QemuFwCfgInitialize
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#
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# The following information is for reference only and not required by the build
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# tools.
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#
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# VALID_ARCHITECTURES = ARM AARCH64
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#
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[Sources]
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QemuFwCfgLib.c
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[Packages]
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MdePkg/MdePkg.dec
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OvmfPkg/OvmfPkg.dec
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ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualizationPkg.dec
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[LibraryClasses]
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BaseLib
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BaseMemoryLib
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IoLib
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PcdLib
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[Pcd]
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gArmVirtualizationTokenSpaceGuid.PcdFwCfgSelectorAddress
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gArmVirtualizationTokenSpaceGuid.PcdFwCfgDataAddress
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