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https://github.com/CloverHackyColor/CloverBootloader.git
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108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
/** @file
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The NvmExpressPei driver is used to manage non-volatile memory subsystem
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which follows NVM Express specification 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 "NvmExpressPei.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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Determine if a specific NVM Express controller can be skipped 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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@retval The number of ports that need to be enumerated.
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**/
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BOOLEAN
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NvmeS3SkipThisController (
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IN EFI_DEVICE_PATH_PROTOCOL *HcDevicePath,
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IN UINTN HcDevicePathLength
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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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BOOLEAN Skip;
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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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Skip = TRUE;
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Status = RestoreLockBox (&gS3StorageDeviceInitListGuid, &DummyData, &S3InitDevicesLength);
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if (Status != EFI_BUFFER_TOO_SMALL) {
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return Skip;
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} else {
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S3InitDevices = AllocatePool (S3InitDevicesLength);
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if (S3InitDevices == NULL) {
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return Skip;
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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 Skip;
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}
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}
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if (S3InitDevices == NULL) {
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return Skip;
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}
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//
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// Only need to initialize the controllers 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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Skip = FALSE;
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break;
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}
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} while (!EntireEnd);
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return Skip;
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}
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