mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
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278 lines
8.1 KiB
C
278 lines
8.1 KiB
C
/** @file
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The device path help function.
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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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//
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// Template for an Nvm Express Device Path node
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//
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NVME_NAMESPACE_DEVICE_PATH mNvmeDevicePathNodeTemplate = {
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{ // Header
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MESSAGING_DEVICE_PATH,
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MSG_NVME_NAMESPACE_DP,
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{
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(UINT8) (sizeof (NVME_NAMESPACE_DEVICE_PATH)),
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(UINT8) ((sizeof (NVME_NAMESPACE_DEVICE_PATH)) >> 8)
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}
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},
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0x0, // NamespaceId
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0x0 // NamespaceUuid
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};
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//
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// Template for an End of entire Device Path node
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//
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EFI_DEVICE_PATH_PROTOCOL mNvmeEndDevicePathNodeTemplate = {
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END_DEVICE_PATH_TYPE,
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END_ENTIRE_DEVICE_PATH_SUBTYPE,
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{
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(UINT8) (sizeof (EFI_DEVICE_PATH_PROTOCOL)),
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(UINT8) ((sizeof (EFI_DEVICE_PATH_PROTOCOL)) >> 8)
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}
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};
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/**
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Returns the 16-bit Length field of a device path node.
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Returns the 16-bit Length field of the device path node specified by Node.
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Node is not required to be aligned on a 16-bit boundary, so it is recommended
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that a function such as ReadUnaligned16() be used to extract the contents of
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the Length field.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@return The 16-bit Length field of the device path node specified by Node.
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**/
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UINTN
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DevicePathNodeLength (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return ReadUnaligned16 ((UINT16 *)&((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Length[0]);
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}
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/**
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Returns a pointer to the next node in a device path.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@return a pointer to the device path node that follows the device path node
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specified by Node.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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NextDevicePathNode (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return (EFI_DEVICE_PATH_PROTOCOL *)((UINT8 *)(Node) + DevicePathNodeLength(Node));
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}
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/**
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Get the size of the current device path instance.
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@param[in] DevicePath A pointer to the EFI_DEVICE_PATH_PROTOCOL
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structure.
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@param[out] InstanceSize The size of the current device path instance.
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@param[out] EntireDevicePathEnd Indicate whether the instance is the last
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one in the device path strucure.
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@retval EFI_SUCCESS The size of the current device path instance is fetched.
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@retval Others Fails to get the size of the current device path instance.
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**/
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EFI_STATUS
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GetDevicePathInstanceSize (
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IN EFI_DEVICE_PATH_PROTOCOL *DevicePath,
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OUT UINTN *InstanceSize,
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OUT BOOLEAN *EntireDevicePathEnd
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)
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{
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EFI_DEVICE_PATH_PROTOCOL *Walker;
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if (DevicePath == NULL || InstanceSize == NULL || EntireDevicePathEnd == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Find the end of the device path instance
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//
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Walker = DevicePath;
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while (Walker->Type != END_DEVICE_PATH_TYPE) {
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Walker = NextDevicePathNode (Walker);
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}
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//
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// Check if 'Walker' points to the end of an entire device path
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//
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if (Walker->SubType == END_ENTIRE_DEVICE_PATH_SUBTYPE) {
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*EntireDevicePathEnd = TRUE;
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} else if (Walker->SubType == END_INSTANCE_DEVICE_PATH_SUBTYPE) {
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*EntireDevicePathEnd = FALSE;
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} else {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Compute the size of the device path instance
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//
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*InstanceSize = ((UINTN) Walker - (UINTN) (DevicePath)) + sizeof (EFI_DEVICE_PATH_PROTOCOL);
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return EFI_SUCCESS;
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}
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/**
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Check the validity of the device path of a NVM Express host controller.
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@param[in] DevicePath A pointer to the EFI_DEVICE_PATH_PROTOCOL
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structure.
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@param[in] DevicePathLength The length of the device path.
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@retval EFI_SUCCESS The device path is valid.
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@retval EFI_INVALID_PARAMETER The device path is invalid.
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**/
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EFI_STATUS
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NvmeIsHcDevicePathValid (
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IN EFI_DEVICE_PATH_PROTOCOL *DevicePath,
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IN UINTN DevicePathLength
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)
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{
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EFI_DEVICE_PATH_PROTOCOL *Start;
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UINTN Size;
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if (DevicePath == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Validate the DevicePathLength is big enough to touch the first node.
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//
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if (DevicePathLength < sizeof (EFI_DEVICE_PATH_PROTOCOL)) {
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return EFI_INVALID_PARAMETER;
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}
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Start = DevicePath;
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while (!(DevicePath->Type == END_DEVICE_PATH_TYPE &&
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DevicePath->SubType == END_ENTIRE_DEVICE_PATH_SUBTYPE)) {
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DevicePath = NextDevicePathNode (DevicePath);
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//
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// Prevent overflow and invalid zero in the 'Length' field of a device path
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// node.
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//
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if ((UINTN) DevicePath <= (UINTN) Start) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Prevent touching memory beyond given DevicePathLength.
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//
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if ((UINTN) DevicePath - (UINTN) Start >
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DevicePathLength - sizeof (EFI_DEVICE_PATH_PROTOCOL)) {
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return EFI_INVALID_PARAMETER;
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}
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}
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//
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// Check if the device path and its size match exactly with each other.
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//
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Size = ((UINTN) DevicePath - (UINTN) Start) + sizeof (EFI_DEVICE_PATH_PROTOCOL);
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if (Size != DevicePathLength) {
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return EFI_INVALID_PARAMETER;
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}
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return EFI_SUCCESS;
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}
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/**
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Build the device path for an Nvm Express device with given namespace identifier
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and namespace extended unique identifier.
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@param[in] Private A pointer to the PEI_NVME_CONTROLLER_PRIVATE_DATA
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data structure.
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@param[in] NamespaceId The given namespace identifier.
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@param[in] NamespaceUuid The given namespace extended unique identifier.
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@param[out] DevicePathLength The length of the device path in bytes specified
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by DevicePath.
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@param[out] DevicePath The device path of Nvm Express device.
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@retval EFI_SUCCESS The operation succeeds.
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@retval EFI_INVALID_PARAMETER The parameters are invalid.
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@retval EFI_OUT_OF_RESOURCES The operation fails due to lack of resources.
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**/
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EFI_STATUS
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NvmeBuildDevicePath (
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IN PEI_NVME_CONTROLLER_PRIVATE_DATA *Private,
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IN UINT32 NamespaceId,
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IN UINT64 NamespaceUuid,
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OUT UINTN *DevicePathLength,
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OUT EFI_DEVICE_PATH_PROTOCOL **DevicePath
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)
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{
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EFI_DEVICE_PATH_PROTOCOL *DevicePathWalker;
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NVME_NAMESPACE_DEVICE_PATH *NvmeDeviceNode;
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if (DevicePathLength == NULL || DevicePath == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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*DevicePathLength = Private->DevicePathLength + sizeof (NVME_NAMESPACE_DEVICE_PATH);
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*DevicePath = AllocatePool (*DevicePathLength);
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if (*DevicePath == NULL) {
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*DevicePathLength = 0;
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return EFI_OUT_OF_RESOURCES;
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}
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//
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// Construct the host controller part device nodes
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//
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DevicePathWalker = *DevicePath;
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CopyMem (
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DevicePathWalker,
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Private->DevicePath,
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Private->DevicePathLength - sizeof (EFI_DEVICE_PATH_PROTOCOL)
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);
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//
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// Construct the Nvm Express device node
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//
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DevicePathWalker = (EFI_DEVICE_PATH_PROTOCOL *) ((UINT8 *)DevicePathWalker +
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(Private->DevicePathLength - sizeof (EFI_DEVICE_PATH_PROTOCOL)));
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CopyMem (
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DevicePathWalker,
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&mNvmeDevicePathNodeTemplate,
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sizeof (mNvmeDevicePathNodeTemplate)
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);
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NvmeDeviceNode = (NVME_NAMESPACE_DEVICE_PATH *)DevicePathWalker;
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NvmeDeviceNode->NamespaceId = NamespaceId;
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NvmeDeviceNode->NamespaceUuid = NamespaceUuid;
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//
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// Construct the end device node
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//
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DevicePathWalker = (EFI_DEVICE_PATH_PROTOCOL *) ((UINT8 *)DevicePathWalker +
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sizeof (NVME_NAMESPACE_DEVICE_PATH));
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CopyMem (
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DevicePathWalker,
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&mNvmeEndDevicePathNodeTemplate,
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sizeof (mNvmeEndDevicePathNodeTemplate)
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);
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return EFI_SUCCESS;
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}
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