/** @file
PCI Root Bridge Io Protocol code.
Copyright (c) 1999 - 2016, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "PciHostBridge.h"
#include "PciRootBridge.h"
#include "PciHostResource.h"
#define NO_MAPPING (VOID *) (UINTN) -1
//
// Lookup table for increment values based on transfer widths
//
UINT8 mInStride[] = {
1, // EfiPciWidthUint8
2, // EfiPciWidthUint16
4, // EfiPciWidthUint32
8, // EfiPciWidthUint64
0, // EfiPciWidthFifoUint8
0, // EfiPciWidthFifoUint16
0, // EfiPciWidthFifoUint32
0, // EfiPciWidthFifoUint64
1, // EfiPciWidthFillUint8
2, // EfiPciWidthFillUint16
4, // EfiPciWidthFillUint32
8 // EfiPciWidthFillUint64
};
//
// Lookup table for increment values based on transfer widths
//
UINT8 mOutStride[] = {
1, // EfiPciWidthUint8
2, // EfiPciWidthUint16
4, // EfiPciWidthUint32
8, // EfiPciWidthUint64
1, // EfiPciWidthFifoUint8
2, // EfiPciWidthFifoUint16
4, // EfiPciWidthFifoUint32
8, // EfiPciWidthFifoUint64
0, // EfiPciWidthFillUint8
0, // EfiPciWidthFillUint16
0, // EfiPciWidthFillUint32
0 // EfiPciWidthFillUint64
};
/**
Construct the Pci Root Bridge instance.
@param Bridge The root bridge instance.
@return The pointer to PCI_ROOT_BRIDGE_INSTANCE just created
or NULL if creation fails.
**/
PCI_ROOT_BRIDGE_INSTANCE *
CreateRootBridge (
IN PCI_ROOT_BRIDGE *Bridge
)
{
PCI_ROOT_BRIDGE_INSTANCE *RootBridge;
PCI_RESOURCE_TYPE Index;
CHAR16 *DevicePathStr;
PCI_ROOT_BRIDGE_APERTURE *Aperture;
DevicePathStr = NULL;
DEBUG ((EFI_D_INFO, "RootBridge: "));
DEBUG ((EFI_D_INFO, "%s\n", DevicePathStr = ConvertDevicePathToText (Bridge->DevicePath, FALSE, FALSE)));
DEBUG ((EFI_D_INFO, " Support/Attr: %lx / %lx\n", Bridge->Supports, Bridge->Attributes));
DEBUG ((EFI_D_INFO, " DmaAbove4G: %s\n", Bridge->DmaAbove4G ? L"Yes" : L"No"));
DEBUG ((EFI_D_INFO, "NoExtConfSpace: %s\n", Bridge->NoExtendedConfigSpace ? L"Yes" : L"No"));
DEBUG ((EFI_D_INFO, " AllocAttr: %lx (%s%s)\n", Bridge->AllocationAttributes,
(Bridge->AllocationAttributes & EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM) != 0 ? L"CombineMemPMem " : L"",
(Bridge->AllocationAttributes & EFI_PCI_HOST_BRIDGE_MEM64_DECODE) != 0 ? L"Mem64Decode" : L""
));
DEBUG ((EFI_D_INFO, " Bus: %lx - %lx\n", Bridge->Bus.Base, Bridge->Bus.Limit));
DEBUG ((EFI_D_INFO, " Io: %lx - %lx\n", Bridge->Io.Base, Bridge->Io.Limit));
DEBUG ((EFI_D_INFO, " Mem: %lx - %lx\n", Bridge->Mem.Base, Bridge->Mem.Limit));
DEBUG ((EFI_D_INFO, " MemAbove4G: %lx - %lx\n", Bridge->MemAbove4G.Base, Bridge->MemAbove4G.Limit));
DEBUG ((EFI_D_INFO, " PMem: %lx - %lx\n", Bridge->PMem.Base, Bridge->PMem.Limit));
DEBUG ((EFI_D_INFO, " PMemAbove4G: %lx - %lx\n", Bridge->PMemAbove4G.Base, Bridge->PMemAbove4G.Limit));
//
// Make sure Mem and MemAbove4G apertures are valid
//
if (Bridge->Mem.Base <= Bridge->Mem.Limit) {
ASSERT (Bridge->Mem.Limit < SIZE_4GB);
if (Bridge->Mem.Limit >= SIZE_4GB) {
return NULL;
}
}
if (Bridge->MemAbove4G.Base <= Bridge->MemAbove4G.Limit) {
ASSERT (Bridge->MemAbove4G.Base >= SIZE_4GB);
if (Bridge->MemAbove4G.Base < SIZE_4GB) {
return NULL;
}
}
if (Bridge->PMem.Base <= Bridge->PMem.Limit) {
ASSERT (Bridge->PMem.Limit < SIZE_4GB);
if (Bridge->PMem.Limit >= SIZE_4GB) {
return NULL;
}
}
if (Bridge->PMemAbove4G.Base <= Bridge->PMemAbove4G.Limit) {
ASSERT (Bridge->PMemAbove4G.Base >= SIZE_4GB);
if (Bridge->PMemAbove4G.Base < SIZE_4GB) {
return NULL;
}
}
//
// Ignore AllocationAttributes when resources were already assigned.
//
if (!Bridge->ResourceAssigned) {
if ((Bridge->AllocationAttributes & EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM) != 0) {
//
// If this bit is set, then the PCI Root Bridge does not
// support separate windows for Non-prefetchable and Prefetchable
// memory.
//
ASSERT (Bridge->PMem.Base > Bridge->PMem.Limit);
ASSERT (Bridge->PMemAbove4G.Base > Bridge->PMemAbove4G.Limit);
if ((Bridge->PMem.Base <= Bridge->PMem.Limit) ||
(Bridge->PMemAbove4G.Base <= Bridge->PMemAbove4G.Limit)
) {
return NULL;
}
}
if ((Bridge->AllocationAttributes & EFI_PCI_HOST_BRIDGE_MEM64_DECODE) == 0) {
//
// If this bit is not set, then the PCI Root Bridge does not support
// 64 bit memory windows.
//
ASSERT (Bridge->MemAbove4G.Base > Bridge->MemAbove4G.Limit);
ASSERT (Bridge->PMemAbove4G.Base > Bridge->PMemAbove4G.Limit);
if ((Bridge->MemAbove4G.Base <= Bridge->MemAbove4G.Limit) ||
(Bridge->PMemAbove4G.Base <= Bridge->PMemAbove4G.Limit)
) {
return NULL;
}
}
}
RootBridge = AllocateZeroPool (sizeof (PCI_ROOT_BRIDGE_INSTANCE));
ASSERT (RootBridge != NULL);
RootBridge->Signature = PCI_ROOT_BRIDGE_SIGNATURE;
RootBridge->Supports = Bridge->Supports;
RootBridge->Attributes = Bridge->Attributes;
RootBridge->DmaAbove4G = Bridge->DmaAbove4G;
RootBridge->NoExtendedConfigSpace = Bridge->NoExtendedConfigSpace;
RootBridge->AllocationAttributes = Bridge->AllocationAttributes;
RootBridge->DevicePath = DuplicateDevicePath (Bridge->DevicePath);
RootBridge->DevicePathStr = DevicePathStr;
RootBridge->ConfigBuffer = AllocatePool (
TypeMax * sizeof (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) + sizeof (EFI_ACPI_END_TAG_DESCRIPTOR)
);
ASSERT (RootBridge->ConfigBuffer != NULL);
InitializeListHead (&RootBridge->Maps);
CopyMem (&RootBridge->Bus, &Bridge->Bus, sizeof (PCI_ROOT_BRIDGE_APERTURE));
CopyMem (&RootBridge->Io, &Bridge->Io, sizeof (PCI_ROOT_BRIDGE_APERTURE));
CopyMem (&RootBridge->Mem, &Bridge->Mem, sizeof (PCI_ROOT_BRIDGE_APERTURE));
CopyMem (&RootBridge->MemAbove4G, &Bridge->MemAbove4G, sizeof (PCI_ROOT_BRIDGE_APERTURE));
CopyMem (&RootBridge->PMem, &Bridge->PMem, sizeof (PCI_ROOT_BRIDGE_APERTURE));
CopyMem (&RootBridge->PMemAbove4G, &Bridge->PMemAbove4G, sizeof (PCI_ROOT_BRIDGE_APERTURE));
for (Index = TypeIo; Index < TypeMax; Index++) {
switch (Index) {
case TypeBus:
Aperture = &RootBridge->Bus;
break;
case TypeIo:
Aperture = &RootBridge->Io;
break;
case TypeMem32:
Aperture = &RootBridge->Mem;
break;
case TypeMem64:
Aperture = &RootBridge->MemAbove4G;
break;
case TypePMem32:
Aperture = &RootBridge->PMem;
break;
case TypePMem64:
Aperture = &RootBridge->PMemAbove4G;
break;
default:
ASSERT (FALSE);
Aperture = NULL;
break;
}
RootBridge->ResAllocNode[Index].Type = Index;
if (Bridge->ResourceAssigned && (Aperture->Limit >= Aperture->Base)) {
RootBridge->ResAllocNode[Index].Base = Aperture->Base;
RootBridge->ResAllocNode[Index].Length = Aperture->Limit - Aperture->Base + 1;
RootBridge->ResAllocNode[Index].Status = ResAllocated;
} else {
RootBridge->ResAllocNode[Index].Base = 0;
RootBridge->ResAllocNode[Index].Length = 0;
RootBridge->ResAllocNode[Index].Status = ResNone;
}
}
RootBridge->RootBridgeIo.SegmentNumber = Bridge->Segment;
RootBridge->RootBridgeIo.PollMem = RootBridgeIoPollMem;
RootBridge->RootBridgeIo.PollIo = RootBridgeIoPollIo;
RootBridge->RootBridgeIo.Mem.Read = RootBridgeIoMemRead;
RootBridge->RootBridgeIo.Mem.Write = RootBridgeIoMemWrite;
RootBridge->RootBridgeIo.Io.Read = RootBridgeIoIoRead;
RootBridge->RootBridgeIo.Io.Write = RootBridgeIoIoWrite;
RootBridge->RootBridgeIo.CopyMem = RootBridgeIoCopyMem;
RootBridge->RootBridgeIo.Pci.Read = RootBridgeIoPciRead;
RootBridge->RootBridgeIo.Pci.Write = RootBridgeIoPciWrite;
RootBridge->RootBridgeIo.Map = RootBridgeIoMap;
RootBridge->RootBridgeIo.Unmap = RootBridgeIoUnmap;
RootBridge->RootBridgeIo.AllocateBuffer = RootBridgeIoAllocateBuffer;
RootBridge->RootBridgeIo.FreeBuffer = RootBridgeIoFreeBuffer;
RootBridge->RootBridgeIo.Flush = RootBridgeIoFlush;
RootBridge->RootBridgeIo.GetAttributes = RootBridgeIoGetAttributes;
RootBridge->RootBridgeIo.SetAttributes = RootBridgeIoSetAttributes;
RootBridge->RootBridgeIo.Configuration = RootBridgeIoConfiguration;
return RootBridge;
}
/**
Check parameters for IO,MMIO,PCI read/write services of PCI Root Bridge IO.
The I/O operations are carried out exactly as requested. The caller is
responsible for satisfying any alignment and I/O width restrictions that a PI
System on a platform might require. For example on some platforms, width
requests of EfiCpuIoWidthUint64 do not work. Misaligned buffers, on the other
hand, will be handled by the driver.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] OperationType I/O operation type: IO/MMIO/PCI.
@param[in] Width Signifies the width of the I/O or Memory operation.
@param[in] Address The base address of the I/O operation.
@param[in] Count The number of I/O operations to perform. The number
of bytes moved is Width size * Count, starting at
Address.
@param[in] Buffer For read operations, the destination buffer to
store the results. For write operations, the source
buffer from which to write data.
@retval EFI_SUCCESS The parameters for this request pass the
checks.
@retval EFI_INVALID_PARAMETER Width is invalid for this PI system.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_UNSUPPORTED The Buffer is not aligned for the given Width.
@retval EFI_UNSUPPORTED The address range specified by Address, Width,
and Count is not valid for this PI system.
**/
EFI_STATUS
RootBridgeIoCheckParameter (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN OPERATION_TYPE OperationType,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN VOID *Buffer
)
{
PCI_ROOT_BRIDGE_INSTANCE *RootBridge;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_PCI_ADDRESS *PciRbAddr;
UINT64 Base;
UINT64 Limit;
UINT32 Size;
//
// Check to see if Buffer is NULL
//
if (Buffer == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Check to see if Width is in the valid range
//
if ((UINT32) Width >= EfiPciWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
//
// For FIFO type, the target address won't increase during the access,
// so treat Count as 1
//
if (Width >= EfiPciWidthFifoUint8 && Width <= EfiPciWidthFifoUint64) {
Count = 1;
}
Width = (EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH) (Width & 0x03);
Size = 1 << Width;
//
// Check to see if Address is aligned
//
if ((Address & (Size - 1)) != 0) {
return EFI_UNSUPPORTED;
}
RootBridge = ROOT_BRIDGE_FROM_THIS (This);
//
// Check to see if any address associated with this transfer exceeds the
// maximum allowed address. The maximum address implied by the parameters
// passed in is Address + Size * Count. If the following condition is met,
// then the transfer is not supported.
//
// Address + Size * Count > Limit + 1
//
// Since Limit can be the maximum integer value supported by the CPU and
// Count can also be the maximum integer value supported by the CPU, this
// range check must be adjusted to avoid all oveflow conditions.
//
if (OperationType == IoOperation) {
//
// Allow Legacy IO access
//
if (Address + MultU64x32 (Count, Size) <= 0x1000) {
if ((RootBridge->Attributes & (
EFI_PCI_ATTRIBUTE_ISA_IO | EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO | EFI_PCI_ATTRIBUTE_VGA_IO |
EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO | EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO |
EFI_PCI_ATTRIBUTE_ISA_IO_16 | EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16 | EFI_PCI_ATTRIBUTE_VGA_IO_16)) != 0) {
return EFI_SUCCESS;
}
}
Base = RootBridge->Io.Base;
Limit = RootBridge->Io.Limit;
} else if (OperationType == MemOperation) {
//
// Allow Legacy MMIO access
//
if ((Address >= 0xA0000) && (Address + MultU64x32 (Count, Size)) <= 0xC0000) {
if ((RootBridge->Attributes & EFI_PCI_ATTRIBUTE_VGA_MEMORY) != 0) {
return EFI_SUCCESS;
}
}
//
// By comparing the Address against Limit we know which range to be used
// for checking
//
if (Address + MultU64x32 (Count, Size) <= RootBridge->Mem.Limit + 1) {
Base = RootBridge->Mem.Base;
Limit = RootBridge->Mem.Limit;
} else {
Base = RootBridge->MemAbove4G.Base;
Limit = RootBridge->MemAbove4G.Limit;
}
} else {
PciRbAddr = (EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_PCI_ADDRESS*) &Address;
if (PciRbAddr->Bus < RootBridge->Bus.Base ||
PciRbAddr->Bus > RootBridge->Bus.Limit) {
return EFI_INVALID_PARAMETER;
}
if (PciRbAddr->Device > PCI_MAX_DEVICE ||
PciRbAddr->Function > PCI_MAX_FUNC) {
return EFI_INVALID_PARAMETER;
}
if (PciRbAddr->ExtendedRegister != 0) {
Address = PciRbAddr->ExtendedRegister;
} else {
Address = PciRbAddr->Register;
}
Base = 0;
Limit = RootBridge->NoExtendedConfigSpace ? 0xFF : 0xFFF;
}
if (Address < Base) {
return EFI_INVALID_PARAMETER;
}
if (Address + MultU64x32 (Count, Size) > Limit + 1) {
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
/**
Polls an address in memory mapped I/O space until an exit condition is met,
or a timeout occurs.
This function provides a standard way to poll a PCI memory location. A PCI
memory read operation is performed at the PCI memory address specified by
Address for the width specified by Width. The result of this PCI memory read
operation is stored in Result. This PCI memory read operation is repeated
until either a timeout of Delay 100 ns units has expired, or (Result & Mask)
is equal to Value.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operations.
@param[in] Address The base address of the memory operations. The caller
is responsible for aligning Address if required.
@param[in] Mask Mask used for the polling criteria. Bytes above Width
in Mask are ignored. The bits in the bytes below Width
which are zero in Mask are ignored when polling the
memory address.
@param[in] Value The comparison value used for the polling exit
criteria.
@param[in] Delay The number of 100 ns units to poll. Note that timer
available may be of poorer granularity.
@param[out] Result Pointer to the last value read from the memory
location.
@retval EFI_SUCCESS The last data returned from the access matched
the poll exit criteria.
@retval EFI_INVALID_PARAMETER Width is invalid.
@retval EFI_INVALID_PARAMETER Result is NULL.
@retval EFI_TIMEOUT Delay expired before a match occurred.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a
lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoPollMem (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINT64 Mask,
IN UINT64 Value,
IN UINT64 Delay,
OUT UINT64 *Result
)
{
EFI_STATUS Status;
UINT64 NumberOfTicks;
UINT32 Remainder;
if (Result == NULL) {
return EFI_INVALID_PARAMETER;
}
if ((UINT32)Width > EfiPciWidthUint64) {
return EFI_INVALID_PARAMETER;
}
//
// No matter what, always do a single poll.
//
Status = This->Mem.Read (This, Width, Address, 1, Result);
if (EFI_ERROR (Status)) {
return Status;
}
if ((*Result & Mask) == Value) {
return EFI_SUCCESS;
}
if (Delay == 0) {
return EFI_SUCCESS;
} else {
//
// Determine the proper # of metronome ticks to wait for polling the
// location. The nuber of ticks is Roundup (Delay /
// mMetronome->TickPeriod)+1
// The "+1" to account for the possibility of the first tick being short
// because we started in the middle of a tick.
//
// BugBug: overriding mMetronome->TickPeriod with UINT32 until Metronome
// protocol definition is updated.
//
NumberOfTicks = DivU64x32Remainder (Delay, (UINT32) mMetronome->TickPeriod,
&Remainder);
if (Remainder != 0) {
NumberOfTicks += 1;
}
NumberOfTicks += 1;
while (NumberOfTicks != 0) {
mMetronome->WaitForTick (mMetronome, 1);
Status = This->Mem.Read (This, Width, Address, 1, Result);
if (EFI_ERROR (Status)) {
return Status;
}
if ((*Result & Mask) == Value) {
return EFI_SUCCESS;
}
NumberOfTicks -= 1;
}
}
return EFI_TIMEOUT;
}
/**
Reads from the I/O space of a PCI Root Bridge. Returns when either the
polling exit criteria is satisfied or after a defined duration.
This function provides a standard way to poll a PCI I/O location. A PCI I/O
read operation is performed at the PCI I/O address specified by Address for
the width specified by Width.
The result of this PCI I/O read operation is stored in Result. This PCI I/O
read operation is repeated until either a timeout of Delay 100 ns units has
expired, or (Result & Mask) is equal to Value.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the I/O operations.
@param[in] Address The base address of the I/O operations. The caller is
responsible for aligning Address if required.
@param[in] Mask Mask used for the polling criteria. Bytes above Width in
Mask are ignored. The bits in the bytes below Width
which are zero in Mask are ignored when polling the I/O
address.
@param[in] Value The comparison value used for the polling exit criteria.
@param[in] Delay The number of 100 ns units to poll. Note that timer
available may be of poorer granularity.
@param[out] Result Pointer to the last value read from the memory location.
@retval EFI_SUCCESS The last data returned from the access matched
the poll exit criteria.
@retval EFI_INVALID_PARAMETER Width is invalid.
@retval EFI_INVALID_PARAMETER Result is NULL.
@retval EFI_TIMEOUT Delay expired before a match occurred.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a
lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoPollIo (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINT64 Mask,
IN UINT64 Value,
IN UINT64 Delay,
OUT UINT64 *Result
)
{
EFI_STATUS Status;
UINT64 NumberOfTicks;
UINT32 Remainder;
//
// No matter what, always do a single poll.
//
if (Result == NULL) {
return EFI_INVALID_PARAMETER;
}
if ((UINT32)Width > EfiPciWidthUint64) {
return EFI_INVALID_PARAMETER;
}
Status = This->Io.Read (This, Width, Address, 1, Result);
if (EFI_ERROR (Status)) {
return Status;
}
if ((*Result & Mask) == Value) {
return EFI_SUCCESS;
}
if (Delay == 0) {
return EFI_SUCCESS;
} else {
//
// Determine the proper # of metronome ticks to wait for polling the
// location. The number of ticks is Roundup (Delay /
// mMetronome->TickPeriod)+1
// The "+1" to account for the possibility of the first tick being short
// because we started in the middle of a tick.
//
NumberOfTicks = DivU64x32Remainder (Delay, (UINT32)mMetronome->TickPeriod,
&Remainder);
if (Remainder != 0) {
NumberOfTicks += 1;
}
NumberOfTicks += 1;
while (NumberOfTicks != 0) {
mMetronome->WaitForTick (mMetronome, 1);
Status = This->Io.Read (This, Width, Address, 1, Result);
if (EFI_ERROR (Status)) {
return Status;
}
if ((*Result & Mask) == Value) {
return EFI_SUCCESS;
}
NumberOfTicks -= 1;
}
}
return EFI_TIMEOUT;
}
/**
Enables a PCI driver to access PCI controller registers in the PCI root
bridge memory space.
The Mem.Read(), and Mem.Write() functions enable a driver to access PCI
controller registers in the PCI root bridge memory space.
The memory operations are carried out exactly as requested. The caller is
responsible for satisfying any alignment and memory width restrictions that a
PCI Root Bridge on a platform might require.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operation.
@param[in] Address The base address of the memory operation. The caller
is responsible for aligning the Address if required.
@param[in] Count The number of memory operations to perform. Bytes
moved is Width size * Count, starting at Address.
@param[out] Buffer For read operations, the destination buffer to store
the results. For write operations, the source buffer
to write data from.
@retval EFI_SUCCESS The data was read from or written to the PCI
root bridge.
@retval EFI_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a
lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoMemRead (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
OUT VOID *Buffer
)
{
EFI_STATUS Status;
Status = RootBridgeIoCheckParameter (This, MemOperation, Width, Address,
Count, Buffer);
if (EFI_ERROR (Status)) {
return Status;
}
return mCpuIo->Mem.Read (mCpuIo, (EFI_CPU_IO_PROTOCOL_WIDTH) Width, Address, Count, Buffer);
}
/**
Enables a PCI driver to access PCI controller registers in the PCI root
bridge memory space.
The Mem.Read(), and Mem.Write() functions enable a driver to access PCI
controller registers in the PCI root bridge memory space.
The memory operations are carried out exactly as requested. The caller is
responsible for satisfying any alignment and memory width restrictions that a
PCI Root Bridge on a platform might require.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operation.
@param[in] Address The base address of the memory operation. The caller
is responsible for aligning the Address if required.
@param[in] Count The number of memory operations to perform. Bytes
moved is Width size * Count, starting at Address.
@param[in] Buffer For read operations, the destination buffer to store
the results. For write operations, the source buffer
to write data from.
@retval EFI_SUCCESS The data was read from or written to the PCI
root bridge.
@retval EFI_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a
lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoMemWrite (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN VOID *Buffer
)
{
EFI_STATUS Status;
Status = RootBridgeIoCheckParameter (This, MemOperation, Width, Address,
Count, Buffer);
if (EFI_ERROR (Status)) {
return Status;
}
return mCpuIo->Mem.Write (mCpuIo, (EFI_CPU_IO_PROTOCOL_WIDTH) Width, Address, Count, Buffer);
}
/**
Enables a PCI driver to access PCI controller registers in the PCI root
bridge I/O space.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operations.
@param[in] Address The base address of the I/O operation. The caller is
responsible for aligning the Address if required.
@param[in] Count The number of I/O operations to perform. Bytes moved
is Width size * Count, starting at Address.
@param[out] Buffer For read operations, the destination buffer to store
the results. For write operations, the source buffer
to write data from.
@retval EFI_SUCCESS The data was read from or written to the PCI
root bridge.
@retval EFI_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a
lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoIoRead (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
OUT VOID *Buffer
)
{
EFI_STATUS Status;
Status = RootBridgeIoCheckParameter (
This, IoOperation, Width,
Address, Count, Buffer
);
if (EFI_ERROR (Status)) {
return Status;
}
return mCpuIo->Io.Read (mCpuIo, (EFI_CPU_IO_PROTOCOL_WIDTH) Width, Address, Count, Buffer);
}
/**
Enables a PCI driver to access PCI controller registers in the PCI root
bridge I/O space.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operations.
@param[in] Address The base address of the I/O operation. The caller is
responsible for aligning the Address if required.
@param[in] Count The number of I/O operations to perform. Bytes moved
is Width size * Count, starting at Address.
@param[in] Buffer For read operations, the destination buffer to store
the results. For write operations, the source buffer
to write data from.
@retval EFI_SUCCESS The data was read from or written to the PCI
root bridge.
@retval EFI_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a
lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoIoWrite (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN VOID *Buffer
)
{
EFI_STATUS Status;
Status = RootBridgeIoCheckParameter (
This, IoOperation, Width,
Address, Count, Buffer
);
if (EFI_ERROR (Status)) {
return Status;
}
return mCpuIo->Io.Write (mCpuIo, (EFI_CPU_IO_PROTOCOL_WIDTH) Width, Address, Count, Buffer);
}
/**
Enables a PCI driver to copy one region of PCI root bridge memory space to
another region of PCI root bridge memory space.
The CopyMem() function enables a PCI driver to copy one region of PCI root
bridge memory space to another region of PCI root bridge memory space. This
is especially useful for video scroll operation on a memory mapped video
buffer.
The memory operations are carried out exactly as requested. The caller is
responsible for satisfying any alignment and memory width restrictions that a
PCI root bridge on a platform might require.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
instance.
@param[in] Width Signifies the width of the memory operations.
@param[in] DestAddress The destination address of the memory operation. The
caller is responsible for aligning the DestAddress if
required.
@param[in] SrcAddress The source address of the memory operation. The caller
is responsible for aligning the SrcAddress if
required.
@param[in] Count The number of memory operations to perform. Bytes
moved is Width size * Count, starting at DestAddress
and SrcAddress.
@retval EFI_SUCCESS The data was copied from one memory region
to another memory region.
@retval EFI_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a
lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoCopyMem (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 DestAddress,
IN UINT64 SrcAddress,
IN UINTN Count
)
{
EFI_STATUS Status;
BOOLEAN Forward;
UINTN Stride;
UINTN Index;
UINT64 Result;
if ((UINT32) Width > EfiPciWidthUint64) {
return EFI_INVALID_PARAMETER;
}
if (DestAddress == SrcAddress) {
return EFI_SUCCESS;
}
Stride = (UINTN) (1 << Width);
Forward = TRUE;
if ((DestAddress > SrcAddress) &&
(DestAddress < (SrcAddress + Count * Stride))) {
Forward = FALSE;
SrcAddress = SrcAddress + (Count - 1) * Stride;
DestAddress = DestAddress + (Count - 1) * Stride;
}
for (Index = 0; Index < Count; Index++) {
Status = RootBridgeIoMemRead (
This,
Width,
SrcAddress,
1,
&Result
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = RootBridgeIoMemWrite (
This,
Width,
DestAddress,
1,
&Result
);
if (EFI_ERROR (Status)) {
return Status;
}
if (Forward) {
SrcAddress += Stride;
DestAddress += Stride;
} else {
SrcAddress -= Stride;
DestAddress -= Stride;
}
}
return EFI_SUCCESS;
}
/**
PCI configuration space access.
@param This A pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
@param Read TRUE indicating it's a read operation.
@param Width Signifies the width of the memory operation.
@param Address The address within the PCI configuration space
for the PCI controller.
@param Count The number of PCI configuration operations
to perform.
@param Buffer The destination buffer to store the results.
@retval EFI_SUCCESS The data was read/written from/to the PCI root bridge.
@retval EFI_INVALID_PARAMETER Invalid parameters found.
**/
EFI_STATUS
EFIAPI
RootBridgeIoPciAccess (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN BOOLEAN Read,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN OUT VOID *Buffer
)
{
EFI_STATUS Status;
PCI_ROOT_BRIDGE_INSTANCE *RootBridge;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_PCI_ADDRESS PciAddress;
UINT8 *Uint8Buffer;
UINT8 InStride;
UINT8 OutStride;
UINTN Size;
Status = RootBridgeIoCheckParameter (This, PciOperation, Width, Address, Count, Buffer);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Read Pci configuration space
//
RootBridge = ROOT_BRIDGE_FROM_THIS (This);
CopyMem (&PciAddress, &Address, sizeof (PciAddress));
if (PciAddress.ExtendedRegister == 0) {
PciAddress.ExtendedRegister = PciAddress.Register;
}
Address = PCI_SEGMENT_LIB_ADDRESS (
RootBridge->RootBridgeIo.SegmentNumber,
PciAddress.Bus,
PciAddress.Device,
PciAddress.Function,
PciAddress.ExtendedRegister
);
//
// Select loop based on the width of the transfer
//
InStride = mInStride[Width];
OutStride = mOutStride[Width];
Size = (UINTN) (1 << (Width & 0x03));
for (Uint8Buffer = Buffer; Count > 0; Address += InStride, Uint8Buffer += OutStride, Count--) {
if (Read) {
PciSegmentReadBuffer (Address, Size, Uint8Buffer);
} else {
PciSegmentWriteBuffer (Address, Size, Uint8Buffer);
}
}
return EFI_SUCCESS;
}
/**
Allows read from PCI configuration space.
@param This A pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
@param Width Signifies the width of the memory operation.
@param Address The address within the PCI configuration space
for the PCI controller.
@param Count The number of PCI configuration operations
to perform.
@param Buffer The destination buffer to store the results.
@retval EFI_SUCCESS The data was read from the PCI root bridge.
@retval EFI_INVALID_PARAMETER Invalid parameters found.
**/
EFI_STATUS
EFIAPI
RootBridgeIoPciRead (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN OUT VOID *Buffer
)
{
return RootBridgeIoPciAccess (This, TRUE, Width, Address, Count, Buffer);
}
/**
Allows write to PCI configuration space.
@param This A pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
@param Width Signifies the width of the memory operation.
@param Address The address within the PCI configuration space
for the PCI controller.
@param Count The number of PCI configuration operations
to perform.
@param Buffer The source buffer to get the results.
@retval EFI_SUCCESS The data was written to the PCI root bridge.
@retval EFI_INVALID_PARAMETER Invalid parameters found.
**/
EFI_STATUS
EFIAPI
RootBridgeIoPciWrite (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN OUT VOID *Buffer
)
{
return RootBridgeIoPciAccess (This, FALSE, Width, Address, Count, Buffer);
}
/**
Provides the PCI controller-specific address needed to access
system memory for DMA.
@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param Operation Indicate if the bus master is going to read or write
to system memory.
@param HostAddress The system memory address to map on the PCI controller.
@param NumberOfBytes On input the number of bytes to map.
On output the number of bytes that were mapped.
@param DeviceAddress The resulting map address for the bus master PCI
controller to use to access the system memory's HostAddress.
@param Mapping The value to pass to Unmap() when the bus master DMA
operation is complete.
@retval EFI_SUCCESS Success.
@retval EFI_INVALID_PARAMETER Invalid parameters found.
@retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common buffer.
@retval EFI_DEVICE_ERROR The System hardware could not map the requested address.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoMap (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_OPERATION Operation,
IN VOID *HostAddress,
IN OUT UINTN *NumberOfBytes,
OUT EFI_PHYSICAL_ADDRESS *DeviceAddress,
OUT VOID **Mapping
)
{
EFI_STATUS Status;
PCI_ROOT_BRIDGE_INSTANCE *RootBridge;
EFI_PHYSICAL_ADDRESS PhysicalAddress;
MAP_INFO *MapInfo;
if (HostAddress == NULL || NumberOfBytes == NULL || DeviceAddress == NULL ||
Mapping == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Make sure that Operation is valid
//
if ((UINT32) Operation >= EfiPciOperationMaximum) {
return EFI_INVALID_PARAMETER;
}
RootBridge = ROOT_BRIDGE_FROM_THIS (This);
PhysicalAddress = (EFI_PHYSICAL_ADDRESS) (UINTN) HostAddress;
if ((!RootBridge->DmaAbove4G ||
(Operation != EfiPciOperationBusMasterRead64 &&
Operation != EfiPciOperationBusMasterWrite64 &&
Operation != EfiPciOperationBusMasterCommonBuffer64)) &&
((PhysicalAddress + *NumberOfBytes) > SIZE_4GB)) {
//
// If the root bridge or the device cannot handle performing DMA above
// 4GB but any part of the DMA transfer being mapped is above 4GB, then
// map the DMA transfer to a buffer below 4GB.
//
if (Operation == EfiPciOperationBusMasterCommonBuffer ||
Operation == EfiPciOperationBusMasterCommonBuffer64) {
//
// Common Buffer operations can not be remapped. If the common buffer
// if above 4GB, then it is not possible to generate a mapping, so return
// an error.
//
return EFI_UNSUPPORTED;
}
//
// Allocate a MAP_INFO structure to remember the mapping when Unmap() is
// called later.
//
MapInfo = AllocatePool (sizeof (MAP_INFO));
if (MapInfo == NULL) {
*NumberOfBytes = 0;
return EFI_OUT_OF_RESOURCES;
}
//
// Initialize the MAP_INFO structure
//
MapInfo->Signature = MAP_INFO_SIGNATURE;
MapInfo->Operation = Operation;
MapInfo->NumberOfBytes = *NumberOfBytes;
MapInfo->NumberOfPages = EFI_SIZE_TO_PAGES (MapInfo->NumberOfBytes);
MapInfo->HostAddress = PhysicalAddress;
MapInfo->MappedHostAddress = SIZE_4GB - 1;
//
// Allocate a buffer below 4GB to map the transfer to.
//
Status = gBS->AllocatePages (
AllocateMaxAddress,
EfiBootServicesData,
MapInfo->NumberOfPages,
&MapInfo->MappedHostAddress
);
if (EFI_ERROR (Status)) {
FreePool (MapInfo);
*NumberOfBytes = 0;
return Status;
}
//
// If this is a read operation from the Bus Master's point of view,
// then copy the contents of the real buffer into the mapped buffer
// so the Bus Master can read the contents of the real buffer.
//
if (Operation == EfiPciOperationBusMasterRead ||
Operation == EfiPciOperationBusMasterRead64) {
CopyMem (
(VOID *) (UINTN) MapInfo->MappedHostAddress,
(VOID *) (UINTN) MapInfo->HostAddress,
MapInfo->NumberOfBytes
);
}
InsertTailList (&RootBridge->Maps, &MapInfo->Link);
//
// The DeviceAddress is the address of the maped buffer below 4GB
//
*DeviceAddress = MapInfo->MappedHostAddress;
//
// Return a pointer to the MAP_INFO structure in Mapping
//
*Mapping = MapInfo;
} else {
//
// If the root bridge CAN handle performing DMA above 4GB or
// the transfer is below 4GB, so the DeviceAddress is simply the
// HostAddress
//
*DeviceAddress = PhysicalAddress;
*Mapping = NO_MAPPING;
}
return EFI_SUCCESS;
}
/**
Completes the Map() operation and releases any corresponding resources.
The Unmap() function completes the Map() operation and releases any
corresponding resources.
If the operation was an EfiPciOperationBusMasterWrite or
EfiPciOperationBusMasterWrite64, the data is committed to the target system
memory.
Any resources used for the mapping are freed.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Mapping The mapping value returned from Map().
@retval EFI_SUCCESS The range was unmapped.
@retval EFI_INVALID_PARAMETER Mapping is not a value that was returned by Map().
@retval EFI_DEVICE_ERROR The data was not committed to the target system memory.
**/
EFI_STATUS
EFIAPI
RootBridgeIoUnmap (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN VOID *Mapping
)
{
MAP_INFO *MapInfo;
LIST_ENTRY *Link;
PCI_ROOT_BRIDGE_INSTANCE *RootBridge;
RootBridge = ROOT_BRIDGE_FROM_THIS (This);
//
// See if the Map() operation associated with this Unmap() required a mapping
// buffer. If a mapping buffer was not required, then this function simply
// returns EFI_SUCCESS.
//
if (Mapping == NO_MAPPING) {
return EFI_SUCCESS;
}
MapInfo = NO_MAPPING;
for (Link = GetFirstNode (&RootBridge->Maps)
; !IsNull (&RootBridge->Maps, Link)
; Link = GetNextNode (&RootBridge->Maps, Link)
) {
MapInfo = MAP_INFO_FROM_LINK (Link);
if (MapInfo == Mapping) {
break;
}
}
//
// Mapping is not a valid value returned by Map()
//
if (MapInfo != Mapping) {
return EFI_INVALID_PARAMETER;
}
RemoveEntryList (&MapInfo->Link);
//
// If this is a write operation from the Bus Master's point of view,
// then copy the contents of the mapped buffer into the real buffer
// so the processor can read the contents of the real buffer.
//
if (MapInfo->Operation == EfiPciOperationBusMasterWrite ||
MapInfo->Operation == EfiPciOperationBusMasterWrite64) {
CopyMem (
(VOID *) (UINTN) MapInfo->HostAddress,
(VOID *) (UINTN) MapInfo->MappedHostAddress,
MapInfo->NumberOfBytes
);
}
//
// Free the mapped buffer and the MAP_INFO structure.
//
gBS->FreePages (MapInfo->MappedHostAddress, MapInfo->NumberOfPages);
FreePool (Mapping);
return EFI_SUCCESS;
}
/**
Allocates pages that are suitable for an EfiPciOperationBusMasterCommonBuffer
or EfiPciOperationBusMasterCommonBuffer64 mapping.
@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param Type This parameter is not used and must be ignored.
@param MemoryType The type of memory to allocate, EfiBootServicesData or
EfiRuntimeServicesData.
@param Pages The number of pages to allocate.
@param HostAddress A pointer to store the base system memory address of the
allocated range.
@param Attributes The requested bit mask of attributes for the allocated
range. Only the attributes
EFI_PCI_ATTRIBUTE_MEMORY_WRITE_COMBINE,
EFI_PCI_ATTRIBUTE_MEMORY_CACHED, and
EFI_PCI_ATTRIBUTE_DUAL_ADDRESS_CYCLE may be used with this
function.
@retval EFI_SUCCESS The requested memory pages were allocated.
@retval EFI_INVALID_PARAMETER MemoryType is invalid.
@retval EFI_INVALID_PARAMETER HostAddress is NULL.
@retval EFI_UNSUPPORTED Attributes is unsupported. The only legal
attribute bits are MEMORY_WRITE_COMBINE,
MEMORY_CACHED, and DUAL_ADDRESS_CYCLE.
@retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.
**/
EFI_STATUS
EFIAPI
RootBridgeIoAllocateBuffer (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_ALLOCATE_TYPE Type,
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages,
OUT VOID **HostAddress,
IN UINT64 Attributes
)
{
EFI_STATUS Status;
EFI_PHYSICAL_ADDRESS PhysicalAddress;
PCI_ROOT_BRIDGE_INSTANCE *RootBridge;
EFI_ALLOCATE_TYPE AllocateType;
//
// Validate Attributes
//
if ((Attributes & EFI_PCI_ATTRIBUTE_INVALID_FOR_ALLOCATE_BUFFER) != 0) {
return EFI_UNSUPPORTED;
}
//
// Check for invalid inputs
//
if (HostAddress == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// The only valid memory types are EfiBootServicesData and
// EfiRuntimeServicesData
//
if (MemoryType != EfiBootServicesData &&
MemoryType != EfiRuntimeServicesData) {
return EFI_INVALID_PARAMETER;
}
RootBridge = ROOT_BRIDGE_FROM_THIS (This);
AllocateType = AllocateAnyPages;
if (!RootBridge->DmaAbove4G ||
(Attributes & EFI_PCI_ATTRIBUTE_DUAL_ADDRESS_CYCLE) == 0) {
//
// Limit allocations to memory below 4GB
//
AllocateType = AllocateMaxAddress;
PhysicalAddress = (EFI_PHYSICAL_ADDRESS) (SIZE_4GB - 1);
}
Status = gBS->AllocatePages (
AllocateType,
MemoryType,
Pages,
&PhysicalAddress
);
if (!EFI_ERROR (Status)) {
*HostAddress = (VOID *) (UINTN) PhysicalAddress;
}
return Status;
}
/**
Frees memory that was allocated with AllocateBuffer().
The FreeBuffer() function frees memory that was allocated with
AllocateBuffer().
@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param Pages The number of pages to free.
@param HostAddress The base system memory address of the allocated range.
@retval EFI_SUCCESS The requested memory pages were freed.
@retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and
Pages was not allocated with AllocateBuffer().
**/
EFI_STATUS
EFIAPI
RootBridgeIoFreeBuffer (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN UINTN Pages,
OUT VOID *HostAddress
)
{
return gBS->FreePages ((EFI_PHYSICAL_ADDRESS) (UINTN) HostAddress, Pages);
}
/**
Flushes all PCI posted write transactions from a PCI host bridge to system
memory.
The Flush() function flushes any PCI posted write transactions from a PCI
host bridge to system memory. Posted write transactions are generated by PCI
bus masters when they perform write transactions to target addresses in
system memory.
This function does not flush posted write transactions from any PCI bridges.
A PCI controller specific action must be taken to guarantee that the posted
write transactions have been flushed from the PCI controller and from all the
PCI bridges into the PCI host bridge. This is typically done with a PCI read
transaction from the PCI controller prior to calling Flush().
@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@retval EFI_SUCCESS The PCI posted write transactions were flushed
from the PCI host bridge to system memory.
@retval EFI_DEVICE_ERROR The PCI posted write transactions were not flushed
from the PCI host bridge due to a hardware error.
**/
EFI_STATUS
EFIAPI
RootBridgeIoFlush (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This
)
{
return EFI_SUCCESS;
}
/**
Gets the attributes that a PCI root bridge supports setting with
SetAttributes(), and the attributes that a PCI root bridge is currently
using.
The GetAttributes() function returns the mask of attributes that this PCI
root bridge supports and the mask of attributes that the PCI root bridge is
currently using.
@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param Supported A pointer to the mask of attributes that this PCI root
bridge supports setting with SetAttributes().
@param Attributes A pointer to the mask of attributes that this PCI root
bridge is currently using.
@retval EFI_SUCCESS If Supports is not NULL, then the attributes
that the PCI root bridge supports is returned
in Supports. If Attributes is not NULL, then
the attributes that the PCI root bridge is
currently using is returned in Attributes.
@retval EFI_INVALID_PARAMETER Both Supports and Attributes are NULL.
**/
EFI_STATUS
EFIAPI
RootBridgeIoGetAttributes (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
OUT UINT64 *Supported,
OUT UINT64 *Attributes
)
{
PCI_ROOT_BRIDGE_INSTANCE *RootBridge;
if (Attributes == NULL && Supported == NULL) {
return EFI_INVALID_PARAMETER;
}
RootBridge = ROOT_BRIDGE_FROM_THIS (This);
//
// Set the return value for Supported and Attributes
//
if (Supported != NULL) {
*Supported = RootBridge->Supports;
}
if (Attributes != NULL) {
*Attributes = RootBridge->Attributes;
}
return EFI_SUCCESS;
}
/**
Sets attributes for a resource range on a PCI root bridge.
The SetAttributes() function sets the attributes specified in Attributes for
the PCI root bridge on the resource range specified by ResourceBase and
ResourceLength. Since the granularity of setting these attributes may vary
from resource type to resource type, and from platform to platform, the
actual resource range and the one passed in by the caller may differ. As a
result, this function may set the attributes specified by Attributes on a
larger resource range than the caller requested. The actual range is returned
in ResourceBase and ResourceLength. The caller is responsible for verifying
that the actual range for which the attributes were set is acceptable.
@param This A pointer to the
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param Attributes The mask of attributes to set. If the
attribute bit MEMORY_WRITE_COMBINE,
MEMORY_CACHED, or MEMORY_DISABLE is set,
then the resource range is specified by
ResourceBase and ResourceLength. If
MEMORY_WRITE_COMBINE, MEMORY_CACHED, and
MEMORY_DISABLE are not set, then
ResourceBase and ResourceLength are ignored,
and may be NULL.
@param ResourceBase A pointer to the base address of the
resource range to be modified by the
attributes specified by Attributes.
@param ResourceLength A pointer to the length of the resource
range to be modified by the attributes
specified by Attributes.
@retval EFI_SUCCESS The current configuration of this PCI root bridge
was returned in Resources.
@retval EFI_UNSUPPORTED The current configuration of this PCI root bridge
could not be retrieved.
**/
EFI_STATUS
EFIAPI
RootBridgeIoSetAttributes (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN UINT64 Attributes,
IN OUT UINT64 *ResourceBase,
IN OUT UINT64 *ResourceLength
)
{
PCI_ROOT_BRIDGE_INSTANCE *RootBridge;
RootBridge = ROOT_BRIDGE_FROM_THIS (This);
if ((Attributes & (~RootBridge->Supports)) != 0) {
return EFI_UNSUPPORTED;
}
RootBridge->Attributes = Attributes;
return EFI_SUCCESS;
}
/**
Retrieves the current resource settings of this PCI root bridge in the form
of a set of ACPI 2.0 resource descriptors.
There are only two resource descriptor types from the ACPI Specification that
may be used to describe the current resources allocated to a PCI root bridge.
These are the QWORD Address Space Descriptor (ACPI 2.0 Section 6.4.3.5.1),
and the End Tag (ACPI 2.0 Section 6.4.2.8). The QWORD Address Space
Descriptor can describe memory, I/O, and bus number ranges for dynamic or
fixed resources. The configuration of a PCI root bridge is described with one
or more QWORD Address Space Descriptors followed by an End Tag.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[out] Resources A pointer to the ACPI 2.0 resource descriptors that
describe the current configuration of this PCI root
bridge. The storage for the ACPI 2.0 resource
descriptors is allocated by this function. The
caller must treat the return buffer as read-only
data, and the buffer must not be freed by the
caller.
@retval EFI_SUCCESS The current configuration of this PCI root bridge
was returned in Resources.
@retval EFI_UNSUPPORTED The current configuration of this PCI root bridge
could not be retrieved.
**/
EFI_STATUS
EFIAPI
RootBridgeIoConfiguration (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
OUT VOID **Resources
)
{
PCI_RESOURCE_TYPE Index;
PCI_ROOT_BRIDGE_INSTANCE *RootBridge;
PCI_RES_NODE *ResAllocNode;
EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor;
EFI_ACPI_END_TAG_DESCRIPTOR *End;
//
// Get this instance of the Root Bridge.
//
RootBridge = ROOT_BRIDGE_FROM_THIS (This);
ZeroMem (
RootBridge->ConfigBuffer,
TypeMax * sizeof (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) + sizeof (EFI_ACPI_END_TAG_DESCRIPTOR)
);
Descriptor = RootBridge->ConfigBuffer;
for (Index = TypeIo; Index < TypeMax; Index++) {
ResAllocNode = &RootBridge->ResAllocNode[Index];
if (ResAllocNode->Status != ResAllocated) {
continue;
}
Descriptor->Desc = ACPI_ADDRESS_SPACE_DESCRIPTOR;
Descriptor->Len = sizeof (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) - 3;
Descriptor->AddrRangeMin = ResAllocNode->Base;
Descriptor->AddrRangeMax = ResAllocNode->Base + ResAllocNode->Length - 1;
Descriptor->AddrLen = ResAllocNode->Length;
switch (ResAllocNode->Type) {
case TypeIo:
Descriptor->ResType = ACPI_ADDRESS_SPACE_TYPE_IO;
break;
case TypePMem32:
Descriptor->SpecificFlag = EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE;
case TypeMem32:
Descriptor->ResType = ACPI_ADDRESS_SPACE_TYPE_MEM;
Descriptor->AddrSpaceGranularity = 32;
break;
case TypePMem64:
Descriptor->SpecificFlag = EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE;
case TypeMem64:
Descriptor->ResType = ACPI_ADDRESS_SPACE_TYPE_MEM;
Descriptor->AddrSpaceGranularity = 64;
break;
case TypeBus:
Descriptor->ResType = ACPI_ADDRESS_SPACE_TYPE_BUS;
break;
default:
break;
}
Descriptor++;
}
//
// Terminate the entries.
//
End = (EFI_ACPI_END_TAG_DESCRIPTOR *) Descriptor;
End->Desc = ACPI_END_TAG_DESCRIPTOR;
End->Checksum = 0x0;
*Resources = RootBridge->ConfigBuffer;
return EFI_SUCCESS;
}