From e120c962f50432199d4125f0b7066a78ccbad6f3 Mon Sep 17 00:00:00 2001 From: Laszlo Ersek Date: Wed, 26 May 2021 22:14:32 +0200 Subject: OvmfPkg/PciHostBridgeLibScan: create from PciHostBridgeLib MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Create an almost verbatim copy of the "OvmfPkg/Library/PciHostBridgeLib/PciHostBridgeLib.inf" library instance. The new PciHostBridgeLibScan instance will ultimately duplicate a negligible amount of code from the original, and will be used by the Bhyve and OvmfXen platforms. List the new driver in "Maintainers.txt", in the "OvmfPkg: bhyve-related modules" and "OvmfPkg: Xen-related modules" sections. This patch should be reviewed with "git show --find-copies-harder". Cc: Anthony Perard Cc: Ard Biesheuvel Cc: Jordan Justen Cc: Julien Grall Cc: Peter Grehan Cc: Philippe Mathieu-Daudé Cc: Rebecca Cran Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2122 Signed-off-by: Laszlo Ersek Message-Id: <20210526201446.12554-30-lersek@redhat.com> Reviewed-by: Ard Biesheuvel Reviewed-by: Philippe Mathieu-Daudé --- .../Library/PciHostBridgeLibScan/PciHostBridge.h | 14 + .../PciHostBridgeLibScan/PciHostBridgeLib.c | 133 ++++++ .../PciHostBridgeLibScan/PciHostBridgeLibScan.inf | 54 +++ OvmfPkg/Library/PciHostBridgeLibScan/XenSupport.c | 472 +++++++++++++++++++++ 4 files changed, 673 insertions(+) create mode 100644 OvmfPkg/Library/PciHostBridgeLibScan/PciHostBridge.h create mode 100644 OvmfPkg/Library/PciHostBridgeLibScan/PciHostBridgeLib.c create mode 100644 OvmfPkg/Library/PciHostBridgeLibScan/PciHostBridgeLibScan.inf create mode 100644 OvmfPkg/Library/PciHostBridgeLibScan/XenSupport.c (limited to 'OvmfPkg') diff --git a/OvmfPkg/Library/PciHostBridgeLibScan/PciHostBridge.h b/OvmfPkg/Library/PciHostBridgeLibScan/PciHostBridge.h new file mode 100644 index 0000000..582b792 --- /dev/null +++ b/OvmfPkg/Library/PciHostBridgeLibScan/PciHostBridge.h @@ -0,0 +1,14 @@ +/** @file + Header file of OVMF instance of PciHostBridgeLib. + + Copyright (C) 2021, Red Hat, Inc. + Copyright (c) 2016, Intel Corporation. All rights reserved.
+ + SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + +PCI_ROOT_BRIDGE * +ScanForRootBridges ( + UINTN *NumberOfRootBridges +); diff --git a/OvmfPkg/Library/PciHostBridgeLibScan/PciHostBridgeLib.c b/OvmfPkg/Library/PciHostBridgeLibScan/PciHostBridgeLib.c new file mode 100644 index 0000000..6c2acc9 --- /dev/null +++ b/OvmfPkg/Library/PciHostBridgeLibScan/PciHostBridgeLib.c @@ -0,0 +1,133 @@ +/** @file + OVMF's instance of the PCI Host Bridge Library. + + Copyright (C) 2016-2021, Red Hat, Inc. + Copyright (c) 2016, Intel Corporation. All rights reserved.
+ + SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ +#include // PCI_MAX_BUS +#include // INTEL_Q35_MCH_DEVIC... +#include // ZeroMem() +#include // PcdGet64() +#include // PCI_ROOT_BRIDGE_APE... +#include // PciHostBridgeUtilit... +#include // EFI_PCI_HOST_BRIDGE... +#include // EFI_PCI_ATTRIBUTE_I... + +#include "PciHostBridge.h" + +STATIC PCI_ROOT_BRIDGE_APERTURE mNonExistAperture = { MAX_UINT64, 0 }; + + +/** + Return all the root bridge instances in an array. + + @param Count Return the count of root bridge instances. + + @return All the root bridge instances in an array. + The array should be passed into PciHostBridgeFreeRootBridges() + when it's not used. +**/ +PCI_ROOT_BRIDGE * +EFIAPI +PciHostBridgeGetRootBridges ( + UINTN *Count + ) +{ + UINT64 Attributes; + UINT64 AllocationAttributes; + PCI_ROOT_BRIDGE_APERTURE Io; + PCI_ROOT_BRIDGE_APERTURE Mem; + PCI_ROOT_BRIDGE_APERTURE MemAbove4G; + + if (PcdGetBool (PcdPciDisableBusEnumeration)) { + return ScanForRootBridges (Count); + } + + ZeroMem (&Io, sizeof (Io)); + ZeroMem (&Mem, sizeof (Mem)); + ZeroMem (&MemAbove4G, sizeof (MemAbove4G)); + + Attributes = EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO | + EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO | + EFI_PCI_ATTRIBUTE_ISA_IO_16 | + EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO | + EFI_PCI_ATTRIBUTE_VGA_MEMORY | + EFI_PCI_ATTRIBUTE_VGA_IO_16 | + EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16; + + AllocationAttributes = EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM; + if (PcdGet64 (PcdPciMmio64Size) > 0) { + AllocationAttributes |= EFI_PCI_HOST_BRIDGE_MEM64_DECODE; + MemAbove4G.Base = PcdGet64 (PcdPciMmio64Base); + MemAbove4G.Limit = PcdGet64 (PcdPciMmio64Base) + + PcdGet64 (PcdPciMmio64Size) - 1; + } else { + CopyMem (&MemAbove4G, &mNonExistAperture, sizeof (mNonExistAperture)); + } + + Io.Base = PcdGet64 (PcdPciIoBase); + Io.Limit = PcdGet64 (PcdPciIoBase) + (PcdGet64 (PcdPciIoSize) - 1); + Mem.Base = PcdGet64 (PcdPciMmio32Base); + Mem.Limit = PcdGet64 (PcdPciMmio32Base) + (PcdGet64 (PcdPciMmio32Size) - 1); + + return PciHostBridgeUtilityGetRootBridges ( + Count, + Attributes, + AllocationAttributes, + FALSE, + PcdGet16 (PcdOvmfHostBridgePciDevId) != INTEL_Q35_MCH_DEVICE_ID, + 0, + PCI_MAX_BUS, + &Io, + &Mem, + &MemAbove4G, + &mNonExistAperture, + &mNonExistAperture + ); +} + + +/** + Free the root bridge instances array returned from + PciHostBridgeGetRootBridges(). + + @param The root bridge instances array. + @param The count of the array. +**/ +VOID +EFIAPI +PciHostBridgeFreeRootBridges ( + PCI_ROOT_BRIDGE *Bridges, + UINTN Count + ) +{ + PciHostBridgeUtilityFreeRootBridges (Bridges, Count); +} + + +/** + Inform the platform that the resource conflict happens. + + @param HostBridgeHandle Handle of the Host Bridge. + @param Configuration Pointer to PCI I/O and PCI memory resource + descriptors. The Configuration contains the resources + for all the root bridges. The resource for each root + bridge is terminated with END descriptor and an + additional END is appended indicating the end of the + entire resources. The resource descriptor field + values follow the description in + EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL + .SubmitResources(). +**/ +VOID +EFIAPI +PciHostBridgeResourceConflict ( + EFI_HANDLE HostBridgeHandle, + VOID *Configuration + ) +{ + PciHostBridgeUtilityResourceConflict (Configuration); +} diff --git a/OvmfPkg/Library/PciHostBridgeLibScan/PciHostBridgeLibScan.inf b/OvmfPkg/Library/PciHostBridgeLibScan/PciHostBridgeLibScan.inf new file mode 100644 index 0000000..4685938 --- /dev/null +++ b/OvmfPkg/Library/PciHostBridgeLibScan/PciHostBridgeLibScan.inf @@ -0,0 +1,54 @@ +## @file +# OVMF's instance of the PCI Host Bridge Library. +# +# Copyright (C) 2016-2021, Red Hat, Inc. +# Copyright (c) 2016 - 2018, Intel Corporation. All rights reserved.
+# +# SPDX-License-Identifier: BSD-2-Clause-Patent +# +# +## + +[Defines] + INF_VERSION = 0x00010005 + BASE_NAME = PciHostBridgeLibScan + FILE_GUID = c93f2411-9bf5-4894-b552-67fae0c3d291 + MODULE_TYPE = DXE_DRIVER + VERSION_STRING = 1.0 + LIBRARY_CLASS = PciHostBridgeLib + +# +# The following information is for reference only and not required by the build +# tools. +# +# VALID_ARCHITECTURES = IA32 X64 EBC +# + +[Sources] + PciHostBridge.h + PciHostBridgeLib.c + XenSupport.c + +[Packages] + MdeModulePkg/MdeModulePkg.dec + MdePkg/MdePkg.dec + OvmfPkg/OvmfPkg.dec + +[LibraryClasses] + BaseLib + BaseMemoryLib + DebugLib + MemoryAllocationLib + PcdLib + PciHostBridgeUtilityLib + PciLib + +[Pcd] + gEfiMdeModulePkgTokenSpaceGuid.PcdPciDisableBusEnumeration + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfHostBridgePciDevId + gUefiOvmfPkgTokenSpaceGuid.PcdPciIoBase + gUefiOvmfPkgTokenSpaceGuid.PcdPciIoSize + gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Base + gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Size + gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Base + gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Size diff --git a/OvmfPkg/Library/PciHostBridgeLibScan/XenSupport.c b/OvmfPkg/Library/PciHostBridgeLibScan/XenSupport.c new file mode 100644 index 0000000..a4a61e5 --- /dev/null +++ b/OvmfPkg/Library/PciHostBridgeLibScan/XenSupport.c @@ -0,0 +1,472 @@ +/** @file + Scan the entire PCI bus for root bridges to support OVMF above Xen. + + Copyright (C) 2021, Red Hat, Inc. + Copyright (c) 2016, Intel Corporation. All rights reserved.
+ + SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + +#include // EFI_PCI_COMMAND_IO_SPACE +#include // INTEL_Q35_MCH_DEVICE_ID +#include // DisableInterrupts() +#include // ZeroMem() +#include // ASSERT() +#include // ReallocatePool() +#include // PcdGet16() +#include // PCI_ROOT_BRIDGE_APERTURE +#include // PciHostBridgeUtilityInitRoot... +#include // PciRead32() +#include // EFI_PCI_ATTRIBUTE_ISA_IO + +#include "PciHostBridge.h" + +STATIC +VOID +PcatPciRootBridgeBarExisted ( + IN UINTN Address, + OUT UINT32 *OriginalValue, + OUT UINT32 *Value + ) +{ + // + // Preserve the original value + // + *OriginalValue = PciRead32 (Address); + + // + // Disable timer interrupt while the BAR is probed + // + DisableInterrupts (); + + PciWrite32 (Address, 0xFFFFFFFF); + *Value = PciRead32 (Address); + PciWrite32 (Address, *OriginalValue); + + // + // Enable interrupt + // + EnableInterrupts (); +} + +#define PCI_COMMAND_DECODE ((UINT16)(EFI_PCI_COMMAND_IO_SPACE | \ + EFI_PCI_COMMAND_MEMORY_SPACE)) +STATIC +VOID +PcatPciRootBridgeDecodingDisable ( + IN UINTN Address + ) +{ + UINT16 Value; + + Value = PciRead16 (Address); + if (Value & PCI_COMMAND_DECODE) { + PciWrite16 (Address, Value & ~(UINT32)PCI_COMMAND_DECODE); + } +} + +STATIC +VOID +PcatPciRootBridgeParseBars ( + IN UINT16 Command, + IN UINTN Bus, + IN UINTN Device, + IN UINTN Function, + IN UINTN BarOffsetBase, + IN UINTN BarOffsetEnd, + IN PCI_ROOT_BRIDGE_APERTURE *Io, + IN PCI_ROOT_BRIDGE_APERTURE *Mem, + IN PCI_ROOT_BRIDGE_APERTURE *MemAbove4G + +) +{ + UINT32 OriginalValue; + UINT32 Value; + UINT32 OriginalUpperValue; + UINT32 UpperValue; + UINT64 Mask; + UINTN Offset; + UINT64 Base; + UINT64 Length; + UINT64 Limit; + PCI_ROOT_BRIDGE_APERTURE *MemAperture; + + // Disable address decoding for every device before OVMF starts sizing it + PcatPciRootBridgeDecodingDisable ( + PCI_LIB_ADDRESS (Bus, Device, Function, PCI_COMMAND_OFFSET) + ); + + for (Offset = BarOffsetBase; Offset < BarOffsetEnd; Offset += sizeof (UINT32)) { + PcatPciRootBridgeBarExisted ( + PCI_LIB_ADDRESS (Bus, Device, Function, Offset), + &OriginalValue, &Value + ); + if (Value == 0) { + continue; + } + if ((Value & BIT0) == BIT0) { + // + // IO Bar + // + if (Command & EFI_PCI_COMMAND_IO_SPACE) { + Mask = 0xfffffffc; + Base = OriginalValue & Mask; + Length = ((~(Value & Mask)) & Mask) + 0x04; + if (!(Value & 0xFFFF0000)) { + Length &= 0x0000FFFF; + } + Limit = Base + Length - 1; + + if (Base < Limit) { + if (Io->Base > Base) { + Io->Base = Base; + } + if (Io->Limit < Limit) { + Io->Limit = Limit; + } + } + } + } else { + // + // Mem Bar + // + if (Command & EFI_PCI_COMMAND_MEMORY_SPACE) { + + Mask = 0xfffffff0; + Base = OriginalValue & Mask; + Length = Value & Mask; + + if ((Value & (BIT1 | BIT2)) == 0) { + // + // 32bit + // + Length = ((~Length) + 1) & 0xffffffff; + + MemAperture = Mem; + } else { + // + // 64bit + // + Offset += 4; + PcatPciRootBridgeBarExisted ( + PCI_LIB_ADDRESS (Bus, Device, Function, Offset), + &OriginalUpperValue, + &UpperValue + ); + + Base = Base | LShiftU64 ((UINT64) OriginalUpperValue, 32); + Length = Length | LShiftU64 ((UINT64) UpperValue, 32); + Length = (~Length) + 1; + + if (Base < BASE_4GB) { + MemAperture = Mem; + } else { + MemAperture = MemAbove4G; + } + } + + Limit = Base + Length - 1; + if (Base < Limit) { + if (MemAperture->Base > Base) { + MemAperture->Base = Base; + } + if (MemAperture->Limit < Limit) { + MemAperture->Limit = Limit; + } + } + } + } + } +} + +STATIC PCI_ROOT_BRIDGE_APERTURE mNonExistAperture = { MAX_UINT64, 0 }; + +PCI_ROOT_BRIDGE * +ScanForRootBridges ( + UINTN *NumberOfRootBridges + ) +{ + UINTN PrimaryBus; + UINTN SubBus; + UINT8 Device; + UINT8 Function; + UINTN NumberOfDevices; + UINTN Address; + PCI_TYPE01 Pci; + UINT64 Attributes; + UINT64 Base; + UINT64 Limit; + UINT64 Value; + PCI_ROOT_BRIDGE_APERTURE Io, Mem, MemAbove4G, *MemAperture; + PCI_ROOT_BRIDGE *RootBridges; + UINTN BarOffsetEnd; + + + *NumberOfRootBridges = 0; + RootBridges = NULL; + + // + // After scanning all the PCI devices on the PCI root bridge's primary bus, + // update the Primary Bus Number for the next PCI root bridge to be this PCI + // root bridge's subordinate bus number + 1. + // + for (PrimaryBus = 0; PrimaryBus <= PCI_MAX_BUS; PrimaryBus = SubBus + 1) { + SubBus = PrimaryBus; + Attributes = 0; + + ZeroMem (&Io, sizeof (Io)); + ZeroMem (&Mem, sizeof (Mem)); + ZeroMem (&MemAbove4G, sizeof (MemAbove4G)); + Io.Base = Mem.Base = MemAbove4G.Base = MAX_UINT64; + // + // Scan all the PCI devices on the primary bus of the PCI root bridge + // + for (Device = 0, NumberOfDevices = 0; Device <= PCI_MAX_DEVICE; Device++) { + + for (Function = 0; Function <= PCI_MAX_FUNC; Function++) { + + // + // Compute the PCI configuration address of the PCI device to probe + // + Address = PCI_LIB_ADDRESS (PrimaryBus, Device, Function, 0); + + // + // Read the Vendor ID from the PCI Configuration Header + // + if (PciRead16 (Address) == MAX_UINT16) { + if (Function == 0) { + // + // If the PCI Configuration Read fails, or a PCI device does not + // exist, then skip this entire PCI device + // + break; + } else { + // + // If PCI function != 0, VendorId == 0xFFFF, we continue to search + // PCI function. + // + continue; + } + } + + // + // Read the entire PCI Configuration Header + // + PciReadBuffer (Address, sizeof (Pci), &Pci); + + // + // Increment the number of PCI device found on the primary bus of the + // PCI root bridge + // + NumberOfDevices++; + + // + // Look for devices with the VGA Palette Snoop enabled in the COMMAND + // register of the PCI Config Header + // + if ((Pci.Hdr.Command & EFI_PCI_COMMAND_VGA_PALETTE_SNOOP) != 0) { + Attributes |= EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO; + Attributes |= EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16; + } + + BarOffsetEnd = 0; + + // + // PCI-PCI Bridge + // + if (IS_PCI_BRIDGE (&Pci)) { + // + // Get the Bus range that the PPB is decoding + // + if (Pci.Bridge.SubordinateBus > SubBus) { + // + // If the subordinate bus number of the PCI-PCI bridge is greater + // than the PCI root bridge's current subordinate bus number, + // then update the PCI root bridge's subordinate bus number + // + SubBus = Pci.Bridge.SubordinateBus; + } + + // + // Get the I/O range that the PPB is decoding + // + Value = Pci.Bridge.IoBase & 0x0f; + Base = ((UINT32) Pci.Bridge.IoBase & 0xf0) << 8; + Limit = (((UINT32) Pci.Bridge.IoLimit & 0xf0) << 8) | 0x0fff; + if (Value == BIT0) { + Base |= ((UINT32) Pci.Bridge.IoBaseUpper16 << 16); + Limit |= ((UINT32) Pci.Bridge.IoLimitUpper16 << 16); + } + if (Base < Limit) { + if (Io.Base > Base) { + Io.Base = Base; + } + if (Io.Limit < Limit) { + Io.Limit = Limit; + } + } + + // + // Get the Memory range that the PPB is decoding + // + Base = ((UINT32) Pci.Bridge.MemoryBase & 0xfff0) << 16; + Limit = (((UINT32) Pci.Bridge.MemoryLimit & 0xfff0) << 16) | 0xfffff; + if (Base < Limit) { + if (Mem.Base > Base) { + Mem.Base = Base; + } + if (Mem.Limit < Limit) { + Mem.Limit = Limit; + } + } + + // + // Get the Prefetchable Memory range that the PPB is decoding + // and merge it into Memory range + // + Value = Pci.Bridge.PrefetchableMemoryBase & 0x0f; + Base = ((UINT32) Pci.Bridge.PrefetchableMemoryBase & 0xfff0) << 16; + Limit = (((UINT32) Pci.Bridge.PrefetchableMemoryLimit & 0xfff0) + << 16) | 0xfffff; + MemAperture = &Mem; + if (Value == BIT0) { + Base |= LShiftU64 (Pci.Bridge.PrefetchableBaseUpper32, 32); + Limit |= LShiftU64 (Pci.Bridge.PrefetchableLimitUpper32, 32); + MemAperture = &MemAbove4G; + } + if (Base < Limit) { + if (MemAperture->Base > Base) { + MemAperture->Base = Base; + } + if (MemAperture->Limit < Limit) { + MemAperture->Limit = Limit; + } + } + + // + // Look at the PPB Configuration for legacy decoding attributes + // + if ((Pci.Bridge.BridgeControl & EFI_PCI_BRIDGE_CONTROL_ISA) + == EFI_PCI_BRIDGE_CONTROL_ISA) { + Attributes |= EFI_PCI_ATTRIBUTE_ISA_IO; + Attributes |= EFI_PCI_ATTRIBUTE_ISA_IO_16; + Attributes |= EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO; + } + if ((Pci.Bridge.BridgeControl & EFI_PCI_BRIDGE_CONTROL_VGA) + == EFI_PCI_BRIDGE_CONTROL_VGA) { + Attributes |= EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO; + Attributes |= EFI_PCI_ATTRIBUTE_VGA_MEMORY; + Attributes |= EFI_PCI_ATTRIBUTE_VGA_IO; + if ((Pci.Bridge.BridgeControl & EFI_PCI_BRIDGE_CONTROL_VGA_16) + != 0) { + Attributes |= EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16; + Attributes |= EFI_PCI_ATTRIBUTE_VGA_IO_16; + } + } + + BarOffsetEnd = OFFSET_OF (PCI_TYPE01, Bridge.Bar[2]); + } else { + // + // Parse the BARs of the PCI device to get what I/O Ranges, Memory + // Ranges, and Prefetchable Memory Ranges the device is decoding + // + if ((Pci.Hdr.HeaderType & HEADER_LAYOUT_CODE) == HEADER_TYPE_DEVICE) { + BarOffsetEnd = OFFSET_OF (PCI_TYPE00, Device.Bar[6]); + } + } + + PcatPciRootBridgeParseBars ( + Pci.Hdr.Command, + PrimaryBus, + Device, + Function, + OFFSET_OF (PCI_TYPE00, Device.Bar), + BarOffsetEnd, + &Io, + &Mem, &MemAbove4G + ); + + // + // See if the PCI device is an IDE controller + // + if (IS_CLASS2 (&Pci, PCI_CLASS_MASS_STORAGE, + PCI_CLASS_MASS_STORAGE_IDE)) { + if (Pci.Hdr.ClassCode[0] & 0x80) { + Attributes |= EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO; + Attributes |= EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO; + } + if (Pci.Hdr.ClassCode[0] & 0x01) { + Attributes |= EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO; + } + if (Pci.Hdr.ClassCode[0] & 0x04) { + Attributes |= EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO; + } + } + + // + // See if the PCI device is a legacy VGA controller or + // a standard VGA controller + // + if (IS_CLASS2 (&Pci, PCI_CLASS_OLD, PCI_CLASS_OLD_VGA) || + IS_CLASS2 (&Pci, PCI_CLASS_DISPLAY, PCI_CLASS_DISPLAY_VGA) + ) { + Attributes |= EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO; + Attributes |= EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16; + Attributes |= EFI_PCI_ATTRIBUTE_VGA_MEMORY; + Attributes |= EFI_PCI_ATTRIBUTE_VGA_IO; + Attributes |= EFI_PCI_ATTRIBUTE_VGA_IO_16; + } + + // + // See if the PCI Device is a PCI - ISA or PCI - EISA + // or ISA_POSITIVE_DECODE Bridge device + // + if (Pci.Hdr.ClassCode[2] == PCI_CLASS_BRIDGE) { + if (Pci.Hdr.ClassCode[1] == PCI_CLASS_BRIDGE_ISA || + Pci.Hdr.ClassCode[1] == PCI_CLASS_BRIDGE_EISA || + Pci.Hdr.ClassCode[1] == PCI_CLASS_BRIDGE_ISA_PDECODE) { + Attributes |= EFI_PCI_ATTRIBUTE_ISA_IO; + Attributes |= EFI_PCI_ATTRIBUTE_ISA_IO_16; + Attributes |= EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO; + } + } + + // + // If this device is not a multi function device, then skip the rest + // of this PCI device + // + if (Function == 0 && !IS_PCI_MULTI_FUNC (&Pci)) { + break; + } + } + } + + // + // If at least one PCI device was found on the primary bus of this PCI + // root bridge, then the PCI root bridge exists. + // + if (NumberOfDevices > 0) { + RootBridges = ReallocatePool ( + (*NumberOfRootBridges) * sizeof (PCI_ROOT_BRIDGE), + (*NumberOfRootBridges + 1) * sizeof (PCI_ROOT_BRIDGE), + RootBridges + ); + ASSERT (RootBridges != NULL); + PciHostBridgeUtilityInitRootBridge ( + Attributes, Attributes, 0, + FALSE, PcdGet16 (PcdOvmfHostBridgePciDevId) != INTEL_Q35_MCH_DEVICE_ID, + (UINT8) PrimaryBus, (UINT8) SubBus, + &Io, &Mem, &MemAbove4G, &mNonExistAperture, &mNonExistAperture, + &RootBridges[*NumberOfRootBridges] + ); + RootBridges[*NumberOfRootBridges].ResourceAssigned = TRUE; + // + // Increment the index for the next PCI Root Bridge + // + (*NumberOfRootBridges)++; + } + } + + return RootBridges; +} -- cgit v1.1