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/** @file
The AhciPei driver is used to manage ATA hard disk device working under AHCI
mode at PEI phase.
Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "AhciPei.h"
#include <Guid/S3StorageDeviceInitList.h>
#include <Library/LockBoxLib.h>
/**
Collect the ports that need to be enumerated on a controller for S3 phase.
@param[in] HcDevicePath Device path of the controller.
@param[in] HcDevicePathLength Length of the device path specified by
HcDevicePath.
@param[out] PortBitMap Bitmap that indicates the ports that need
to be enumerated on the controller.
@retval The number of ports that need to be enumerated.
**/
UINT8
AhciS3GetEumeratePorts (
IN EFI_DEVICE_PATH_PROTOCOL *HcDevicePath,
IN UINTN HcDevicePathLength,
OUT UINT32 *PortBitMap
)
{
EFI_STATUS Status;
UINT8 DummyData;
UINTN S3InitDevicesLength;
EFI_DEVICE_PATH_PROTOCOL *S3InitDevices;
EFI_DEVICE_PATH_PROTOCOL *DevicePathInst;
UINTN DevicePathInstLength;
BOOLEAN EntireEnd;
SATA_DEVICE_PATH *SataDeviceNode;
*PortBitMap = 0;
//
// From the LockBox, get the list of device paths for devices need to be
// initialized in S3.
//
S3InitDevices = NULL;
S3InitDevicesLength = sizeof (DummyData);
EntireEnd = FALSE;
Status = RestoreLockBox (&gS3StorageDeviceInitListGuid, &DummyData, &S3InitDevicesLength);
if (Status != EFI_BUFFER_TOO_SMALL) {
return 0;
} else {
S3InitDevices = AllocatePool (S3InitDevicesLength);
if (S3InitDevices == NULL) {
return 0;
}
Status = RestoreLockBox (&gS3StorageDeviceInitListGuid, S3InitDevices, &S3InitDevicesLength);
if (EFI_ERROR (Status)) {
return 0;
}
}
if (S3InitDevices == NULL) {
return 0;
}
//
// Only enumerate the ports that exist in the device list.
//
do {
//
// Fetch the size of current device path instance.
//
Status = GetDevicePathInstanceSize (
S3InitDevices,
&DevicePathInstLength,
&EntireEnd
);
if (EFI_ERROR (Status)) {
break;
}
DevicePathInst = S3InitDevices;
S3InitDevices = (EFI_DEVICE_PATH_PROTOCOL *)((UINTN) S3InitDevices + DevicePathInstLength);
if (HcDevicePathLength >= DevicePathInstLength) {
continue;
}
//
// Compare the device paths to determine if the device is managed by this
// controller.
//
if (CompareMem (
DevicePathInst,
HcDevicePath,
HcDevicePathLength - sizeof (EFI_DEVICE_PATH_PROTOCOL)
) == 0) {
//
// Get the port number.
//
while (DevicePathInst->Type != END_DEVICE_PATH_TYPE) {
if ((DevicePathInst->Type == MESSAGING_DEVICE_PATH) &&
(DevicePathInst->SubType == MSG_SATA_DP)) {
SataDeviceNode = (SATA_DEVICE_PATH *) DevicePathInst;
//
// For now, the driver only support upto AHCI_MAX_PORTS ports and
// devices directly connected to a HBA.
//
if ((SataDeviceNode->HBAPortNumber >= AHCI_MAX_PORTS) ||
(SataDeviceNode->PortMultiplierPortNumber != 0xFFFF)) {
break;
}
*PortBitMap |= (UINT32)BIT0 << SataDeviceNode->HBAPortNumber;
break;
}
DevicePathInst = NextDevicePathNode (DevicePathInst);
}
}
} while (!EntireEnd);
//
// Return the number of ports need to be enumerated on this controller.
//
return AhciGetNumberOfPortsFromMap (*PortBitMap);
}
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