+++ /dev/null
-/** @file\r
- Scan the entire PCI bus for root bridges to support OVMF above Xen.\r
-\r
- Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>\r
-\r
- SPDX-License-Identifier: BSD-2-Clause-Patent\r
-\r
-**/\r
-\r
-#include <IndustryStandard/Pci.h> // EFI_PCI_COMMAND_IO_SPACE\r
-#include <IndustryStandard/Q35MchIch9.h> // INTEL_Q35_MCH_DEVICE_ID\r
-#include <Library/BaseLib.h> // DisableInterrupts()\r
-#include <Library/BaseMemoryLib.h> // ZeroMem()\r
-#include <Library/DebugLib.h> // ASSERT()\r
-#include <Library/MemoryAllocationLib.h> // ReallocatePool()\r
-#include <Library/PcdLib.h> // PcdGet16()\r
-#include <Library/PciHostBridgeLib.h> // PCI_ROOT_BRIDGE_APERTURE\r
-#include <Library/PciHostBridgeUtilityLib.h> // PciHostBridgeUtilityInitRoot...\r
-#include <Library/PciLib.h> // PciRead32()\r
-#include <Protocol/PciRootBridgeIo.h> // EFI_PCI_ATTRIBUTE_ISA_IO\r
-\r
-#include "PciHostBridge.h"\r
-\r
-STATIC\r
-VOID\r
-PcatPciRootBridgeBarExisted (\r
- IN UINTN Address,\r
- OUT UINT32 *OriginalValue,\r
- OUT UINT32 *Value\r
- )\r
-{\r
- //\r
- // Preserve the original value\r
- //\r
- *OriginalValue = PciRead32 (Address);\r
-\r
- //\r
- // Disable timer interrupt while the BAR is probed\r
- //\r
- DisableInterrupts ();\r
-\r
- PciWrite32 (Address, 0xFFFFFFFF);\r
- *Value = PciRead32 (Address);\r
- PciWrite32 (Address, *OriginalValue);\r
-\r
- //\r
- // Enable interrupt\r
- //\r
- EnableInterrupts ();\r
-}\r
-\r
-#define PCI_COMMAND_DECODE ((UINT16)(EFI_PCI_COMMAND_IO_SPACE | \\r
- EFI_PCI_COMMAND_MEMORY_SPACE))\r
-STATIC\r
-VOID\r
-PcatPciRootBridgeDecodingDisable (\r
- IN UINTN Address\r
- )\r
-{\r
- UINT16 Value;\r
-\r
- Value = PciRead16 (Address);\r
- if (Value & PCI_COMMAND_DECODE) {\r
- PciWrite16 (Address, Value & ~(UINT32)PCI_COMMAND_DECODE);\r
- }\r
-}\r
-\r
-STATIC\r
-VOID\r
-PcatPciRootBridgeParseBars (\r
- IN UINT16 Command,\r
- IN UINTN Bus,\r
- IN UINTN Device,\r
- IN UINTN Function,\r
- IN UINTN BarOffsetBase,\r
- IN UINTN BarOffsetEnd,\r
- IN PCI_ROOT_BRIDGE_APERTURE *Io,\r
- IN PCI_ROOT_BRIDGE_APERTURE *Mem,\r
- IN PCI_ROOT_BRIDGE_APERTURE *MemAbove4G\r
-\r
-)\r
-{\r
- UINT32 OriginalValue;\r
- UINT32 Value;\r
- UINT32 OriginalUpperValue;\r
- UINT32 UpperValue;\r
- UINT64 Mask;\r
- UINTN Offset;\r
- UINT64 Base;\r
- UINT64 Length;\r
- UINT64 Limit;\r
- PCI_ROOT_BRIDGE_APERTURE *MemAperture;\r
-\r
- // Disable address decoding for every device before OVMF starts sizing it\r
- PcatPciRootBridgeDecodingDisable (\r
- PCI_LIB_ADDRESS (Bus, Device, Function, PCI_COMMAND_OFFSET)\r
- );\r
-\r
- for (Offset = BarOffsetBase; Offset < BarOffsetEnd; Offset += sizeof (UINT32)) {\r
- PcatPciRootBridgeBarExisted (\r
- PCI_LIB_ADDRESS (Bus, Device, Function, Offset),\r
- &OriginalValue, &Value\r
- );\r
- if (Value == 0) {\r
- continue;\r
- }\r
- if ((Value & BIT0) == BIT0) {\r
- //\r
- // IO Bar\r
- //\r
- if (Command & EFI_PCI_COMMAND_IO_SPACE) {\r
- Mask = 0xfffffffc;\r
- Base = OriginalValue & Mask;\r
- Length = ((~(Value & Mask)) & Mask) + 0x04;\r
- if (!(Value & 0xFFFF0000)) {\r
- Length &= 0x0000FFFF;\r
- }\r
- Limit = Base + Length - 1;\r
-\r
- if (Base < Limit) {\r
- if (Io->Base > Base) {\r
- Io->Base = Base;\r
- }\r
- if (Io->Limit < Limit) {\r
- Io->Limit = Limit;\r
- }\r
- }\r
- }\r
- } else {\r
- //\r
- // Mem Bar\r
- //\r
- if (Command & EFI_PCI_COMMAND_MEMORY_SPACE) {\r
-\r
- Mask = 0xfffffff0;\r
- Base = OriginalValue & Mask;\r
- Length = Value & Mask;\r
-\r
- if ((Value & (BIT1 | BIT2)) == 0) {\r
- //\r
- // 32bit\r
- //\r
- Length = ((~Length) + 1) & 0xffffffff;\r
-\r
- MemAperture = Mem;\r
- } else {\r
- //\r
- // 64bit\r
- //\r
- Offset += 4;\r
- PcatPciRootBridgeBarExisted (\r
- PCI_LIB_ADDRESS (Bus, Device, Function, Offset),\r
- &OriginalUpperValue,\r
- &UpperValue\r
- );\r
-\r
- Base = Base | LShiftU64 ((UINT64) OriginalUpperValue, 32);\r
- Length = Length | LShiftU64 ((UINT64) UpperValue, 32);\r
- Length = (~Length) + 1;\r
-\r
- if (Base < BASE_4GB) {\r
- MemAperture = Mem;\r
- } else {\r
- MemAperture = MemAbove4G;\r
- }\r
- }\r
-\r
- Limit = Base + Length - 1;\r
- if (Base < Limit) {\r
- if (MemAperture->Base > Base) {\r
- MemAperture->Base = Base;\r
- }\r
- if (MemAperture->Limit < Limit) {\r
- MemAperture->Limit = Limit;\r
- }\r
- }\r
- }\r
- }\r
- }\r
-}\r
-\r
-STATIC PCI_ROOT_BRIDGE_APERTURE mNonExistAperture = { MAX_UINT64, 0 };\r
-\r
-PCI_ROOT_BRIDGE *\r
-ScanForRootBridges (\r
- UINTN *NumberOfRootBridges\r
- )\r
-{\r
- UINTN PrimaryBus;\r
- UINTN SubBus;\r
- UINT8 Device;\r
- UINT8 Function;\r
- UINTN NumberOfDevices;\r
- UINTN Address;\r
- PCI_TYPE01 Pci;\r
- UINT64 Attributes;\r
- UINT64 Base;\r
- UINT64 Limit;\r
- UINT64 Value;\r
- PCI_ROOT_BRIDGE_APERTURE Io, Mem, MemAbove4G, *MemAperture;\r
- PCI_ROOT_BRIDGE *RootBridges;\r
- UINTN BarOffsetEnd;\r
-\r
-\r
- *NumberOfRootBridges = 0;\r
- RootBridges = NULL;\r
-\r
- //\r
- // After scanning all the PCI devices on the PCI root bridge's primary bus,\r
- // update the Primary Bus Number for the next PCI root bridge to be this PCI\r
- // root bridge's subordinate bus number + 1.\r
- //\r
- for (PrimaryBus = 0; PrimaryBus <= PCI_MAX_BUS; PrimaryBus = SubBus + 1) {\r
- SubBus = PrimaryBus;\r
- Attributes = 0;\r
-\r
- ZeroMem (&Io, sizeof (Io));\r
- ZeroMem (&Mem, sizeof (Mem));\r
- ZeroMem (&MemAbove4G, sizeof (MemAbove4G));\r
- Io.Base = Mem.Base = MemAbove4G.Base = MAX_UINT64;\r
- //\r
- // Scan all the PCI devices on the primary bus of the PCI root bridge\r
- //\r
- for (Device = 0, NumberOfDevices = 0; Device <= PCI_MAX_DEVICE; Device++) {\r
-\r
- for (Function = 0; Function <= PCI_MAX_FUNC; Function++) {\r
-\r
- //\r
- // Compute the PCI configuration address of the PCI device to probe\r
- //\r
- Address = PCI_LIB_ADDRESS (PrimaryBus, Device, Function, 0);\r
-\r
- //\r
- // Read the Vendor ID from the PCI Configuration Header\r
- //\r
- if (PciRead16 (Address) == MAX_UINT16) {\r
- if (Function == 0) {\r
- //\r
- // If the PCI Configuration Read fails, or a PCI device does not\r
- // exist, then skip this entire PCI device\r
- //\r
- break;\r
- } else {\r
- //\r
- // If PCI function != 0, VendorId == 0xFFFF, we continue to search\r
- // PCI function.\r
- //\r
- continue;\r
- }\r
- }\r
-\r
- //\r
- // Read the entire PCI Configuration Header\r
- //\r
- PciReadBuffer (Address, sizeof (Pci), &Pci);\r
-\r
- //\r
- // Increment the number of PCI device found on the primary bus of the\r
- // PCI root bridge\r
- //\r
- NumberOfDevices++;\r
-\r
- //\r
- // Look for devices with the VGA Palette Snoop enabled in the COMMAND\r
- // register of the PCI Config Header\r
- //\r
- if ((Pci.Hdr.Command & EFI_PCI_COMMAND_VGA_PALETTE_SNOOP) != 0) {\r
- Attributes |= EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO;\r
- Attributes |= EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16;\r
- }\r
-\r
- BarOffsetEnd = 0;\r
-\r
- //\r
- // PCI-PCI Bridge\r
- //\r
- if (IS_PCI_BRIDGE (&Pci)) {\r
- //\r
- // Get the Bus range that the PPB is decoding\r
- //\r
- if (Pci.Bridge.SubordinateBus > SubBus) {\r
- //\r
- // If the subordinate bus number of the PCI-PCI bridge is greater\r
- // than the PCI root bridge's current subordinate bus number,\r
- // then update the PCI root bridge's subordinate bus number\r
- //\r
- SubBus = Pci.Bridge.SubordinateBus;\r
- }\r
-\r
- //\r
- // Get the I/O range that the PPB is decoding\r
- //\r
- Value = Pci.Bridge.IoBase & 0x0f;\r
- Base = ((UINT32) Pci.Bridge.IoBase & 0xf0) << 8;\r
- Limit = (((UINT32) Pci.Bridge.IoLimit & 0xf0) << 8) | 0x0fff;\r
- if (Value == BIT0) {\r
- Base |= ((UINT32) Pci.Bridge.IoBaseUpper16 << 16);\r
- Limit |= ((UINT32) Pci.Bridge.IoLimitUpper16 << 16);\r
- }\r
- if (Base < Limit) {\r
- if (Io.Base > Base) {\r
- Io.Base = Base;\r
- }\r
- if (Io.Limit < Limit) {\r
- Io.Limit = Limit;\r
- }\r
- }\r
-\r
- //\r
- // Get the Memory range that the PPB is decoding\r
- //\r
- Base = ((UINT32) Pci.Bridge.MemoryBase & 0xfff0) << 16;\r
- Limit = (((UINT32) Pci.Bridge.MemoryLimit & 0xfff0) << 16) | 0xfffff;\r
- if (Base < Limit) {\r
- if (Mem.Base > Base) {\r
- Mem.Base = Base;\r
- }\r
- if (Mem.Limit < Limit) {\r
- Mem.Limit = Limit;\r
- }\r
- }\r
-\r
- //\r
- // Get the Prefetchable Memory range that the PPB is decoding\r
- // and merge it into Memory range\r
- //\r
- Value = Pci.Bridge.PrefetchableMemoryBase & 0x0f;\r
- Base = ((UINT32) Pci.Bridge.PrefetchableMemoryBase & 0xfff0) << 16;\r
- Limit = (((UINT32) Pci.Bridge.PrefetchableMemoryLimit & 0xfff0)\r
- << 16) | 0xfffff;\r
- MemAperture = &Mem;\r
- if (Value == BIT0) {\r
- Base |= LShiftU64 (Pci.Bridge.PrefetchableBaseUpper32, 32);\r
- Limit |= LShiftU64 (Pci.Bridge.PrefetchableLimitUpper32, 32);\r
- MemAperture = &MemAbove4G;\r
- }\r
- if (Base < Limit) {\r
- if (MemAperture->Base > Base) {\r
- MemAperture->Base = Base;\r
- }\r
- if (MemAperture->Limit < Limit) {\r
- MemAperture->Limit = Limit;\r
- }\r
- }\r
-\r
- //\r
- // Look at the PPB Configuration for legacy decoding attributes\r
- //\r
- if ((Pci.Bridge.BridgeControl & EFI_PCI_BRIDGE_CONTROL_ISA)\r
- == EFI_PCI_BRIDGE_CONTROL_ISA) {\r
- Attributes |= EFI_PCI_ATTRIBUTE_ISA_IO;\r
- Attributes |= EFI_PCI_ATTRIBUTE_ISA_IO_16;\r
- Attributes |= EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO;\r
- }\r
- if ((Pci.Bridge.BridgeControl & EFI_PCI_BRIDGE_CONTROL_VGA)\r
- == EFI_PCI_BRIDGE_CONTROL_VGA) {\r
- Attributes |= EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO;\r
- Attributes |= EFI_PCI_ATTRIBUTE_VGA_MEMORY;\r
- Attributes |= EFI_PCI_ATTRIBUTE_VGA_IO;\r
- if ((Pci.Bridge.BridgeControl & EFI_PCI_BRIDGE_CONTROL_VGA_16)\r
- != 0) {\r
- Attributes |= EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16;\r
- Attributes |= EFI_PCI_ATTRIBUTE_VGA_IO_16;\r
- }\r
- }\r
-\r
- BarOffsetEnd = OFFSET_OF (PCI_TYPE01, Bridge.Bar[2]);\r
- } else {\r
- //\r
- // Parse the BARs of the PCI device to get what I/O Ranges, Memory\r
- // Ranges, and Prefetchable Memory Ranges the device is decoding\r
- //\r
- if ((Pci.Hdr.HeaderType & HEADER_LAYOUT_CODE) == HEADER_TYPE_DEVICE) {\r
- BarOffsetEnd = OFFSET_OF (PCI_TYPE00, Device.Bar[6]);\r
- }\r
- }\r
-\r
- PcatPciRootBridgeParseBars (\r
- Pci.Hdr.Command,\r
- PrimaryBus,\r
- Device,\r
- Function,\r
- OFFSET_OF (PCI_TYPE00, Device.Bar),\r
- BarOffsetEnd,\r
- &Io,\r
- &Mem, &MemAbove4G\r
- );\r
-\r
- //\r
- // See if the PCI device is an IDE controller\r
- //\r
- if (IS_CLASS2 (&Pci, PCI_CLASS_MASS_STORAGE,\r
- PCI_CLASS_MASS_STORAGE_IDE)) {\r
- if (Pci.Hdr.ClassCode[0] & 0x80) {\r
- Attributes |= EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO;\r
- Attributes |= EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO;\r
- }\r
- if (Pci.Hdr.ClassCode[0] & 0x01) {\r
- Attributes |= EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO;\r
- }\r
- if (Pci.Hdr.ClassCode[0] & 0x04) {\r
- Attributes |= EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO;\r
- }\r
- }\r
-\r
- //\r
- // See if the PCI device is a legacy VGA controller or\r
- // a standard VGA controller\r
- //\r
- if (IS_CLASS2 (&Pci, PCI_CLASS_OLD, PCI_CLASS_OLD_VGA) ||\r
- IS_CLASS2 (&Pci, PCI_CLASS_DISPLAY, PCI_CLASS_DISPLAY_VGA)\r
- ) {\r
- Attributes |= EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO;\r
- Attributes |= EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16;\r
- Attributes |= EFI_PCI_ATTRIBUTE_VGA_MEMORY;\r
- Attributes |= EFI_PCI_ATTRIBUTE_VGA_IO;\r
- Attributes |= EFI_PCI_ATTRIBUTE_VGA_IO_16;\r
- }\r
-\r
- //\r
- // See if the PCI Device is a PCI - ISA or PCI - EISA\r
- // or ISA_POSITIVE_DECODE Bridge device\r
- //\r
- if (Pci.Hdr.ClassCode[2] == PCI_CLASS_BRIDGE) {\r
- if (Pci.Hdr.ClassCode[1] == PCI_CLASS_BRIDGE_ISA ||\r
- Pci.Hdr.ClassCode[1] == PCI_CLASS_BRIDGE_EISA ||\r
- Pci.Hdr.ClassCode[1] == PCI_CLASS_BRIDGE_ISA_PDECODE) {\r
- Attributes |= EFI_PCI_ATTRIBUTE_ISA_IO;\r
- Attributes |= EFI_PCI_ATTRIBUTE_ISA_IO_16;\r
- Attributes |= EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO;\r
- }\r
- }\r
-\r
- //\r
- // If this device is not a multi function device, then skip the rest\r
- // of this PCI device\r
- //\r
- if (Function == 0 && !IS_PCI_MULTI_FUNC (&Pci)) {\r
- break;\r
- }\r
- }\r
- }\r
-\r
- //\r
- // If at least one PCI device was found on the primary bus of this PCI\r
- // root bridge, then the PCI root bridge exists.\r
- //\r
- if (NumberOfDevices > 0) {\r
- RootBridges = ReallocatePool (\r
- (*NumberOfRootBridges) * sizeof (PCI_ROOT_BRIDGE),\r
- (*NumberOfRootBridges + 1) * sizeof (PCI_ROOT_BRIDGE),\r
- RootBridges\r
- );\r
- ASSERT (RootBridges != NULL);\r
- PciHostBridgeUtilityInitRootBridge (\r
- Attributes, Attributes, 0,\r
- FALSE, PcdGet16 (PcdOvmfHostBridgePciDevId) != INTEL_Q35_MCH_DEVICE_ID,\r
- (UINT8) PrimaryBus, (UINT8) SubBus,\r
- &Io, &Mem, &MemAbove4G, &mNonExistAperture, &mNonExistAperture,\r
- &RootBridges[*NumberOfRootBridges]\r
- );\r
- RootBridges[*NumberOfRootBridges].ResourceAssigned = TRUE;\r
- //\r
- // Increment the index for the next PCI Root Bridge\r
- //\r
- (*NumberOfRootBridges)++;\r
- }\r
- }\r
-\r
- return RootBridges;\r
-}\r
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