ad3359eb43
The BarExisted() function in "MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c" raises the TPL to TPL_HIGH_LEVEL before accessing PCI config space. The PciExpressLib instance under "MdePkg/Library/BasePciExpressLib" -- serving the PCI config space access -- calls PcdGet64(PcdPciExpressBaseAddress) in turn, for each such call. The PcdGet64() function, when issued at TPL_HIGH_LEVEL, triggers an ASSERT(). PcdGet64() is based on a protocol in this UEFI phase, and protocol handler services are not allowed above TPL_NOTIFY (see Table 23 "TPL Restrictions" in the UEFI spec). Clone the library, and in a new constructor, cache the PCD in a global variable. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Olivier Martin <Olivier.martin@arm.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16909 6f19259b-4bc3-4df7-8a09-765794883524
47 lines
1.4 KiB
INI
47 lines
1.4 KiB
INI
## @file
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# Instance of PCI Express Library using the 256 MB PCI Express MMIO window.
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#
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# PCI Express Library that uses the 256 MB PCI Express MMIO window to perform
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# PCI Configuration cycles. Layers on top of an I/O Library instance.
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#
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# Copyright (c) 2007 - 2014, Intel Corporation. All rights reserved.<BR>
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#
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this 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,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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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 = BaseCachingPciExpressLib
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FILE_GUID = 3f3ffd80-04dc-4a2b-9d25-ecca55c2e520
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MODULE_TYPE = BASE
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VERSION_STRING = 1.0
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LIBRARY_CLASS = PciExpressLib|DXE_DRIVER UEFI_DRIVER UEFI_APPLICATION
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CONSTRUCTOR = PciExpressLibInitialize
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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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PciExpressLib.c
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[Packages]
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MdePkg/MdePkg.dec
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[LibraryClasses]
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BaseLib
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PcdLib
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DebugLib
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IoLib
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[Pcd]
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gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress ## CONSUMES
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