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