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MdeModulePkg: Add RamDiskDxe driver implementation

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The RamDiskDxe driver will:
1. Produce the EFI RAM Disk Protocol
2. Install RAM disk device path and block I/O related protocols on the
   RAM disk device handle.
3. Install RAM disk configuration form to HII database

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Samer El-Haj-Mahmoud <elhaj@hpe.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
This commit is contained in:
Hao Wu
2016-02-03 14:14:47 +08:00
parent 7b0a1ead7d
commit 20752cb8e7
14 changed files with 2648 additions and 0 deletions
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253
MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskFileExplorer.c Normal file
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/** @file
Internal file explorer helper functions for RamDiskDxe driver.
Copyright (c) 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 "RamDiskImpl.h"
/**
Helper function called as part of the code needed to allocate the proper
sized buffer for various EFI interfaces.
@param[in, out] Status Current status.
@param[in, out] Buffer Current allocated buffer, or NULL.
@param[in] BufferSize Current buffer size needed.
@retval TRUE If the buffer was reallocated and the caller should
try the API again.
@retval FALSE The caller should not call this function again.
**/
BOOLEAN
GrowBuffer (
IN OUT EFI_STATUS *Status,
IN OUT VOID **Buffer,
IN UINTN BufferSize
)
{
BOOLEAN TryAgain;
//
// If this is an initial request, buffer will be null with a new buffer size
//
if ((*Buffer == NULL) && (BufferSize != 0)) {
*Status = EFI_BUFFER_TOO_SMALL;
}
//
// If the status code is "buffer too small", resize the buffer
//
TryAgain = FALSE;
if (*Status == EFI_BUFFER_TOO_SMALL) {
if (*Buffer != NULL) {
FreePool (*Buffer);
}
*Buffer = AllocateZeroPool (BufferSize);
if (*Buffer != NULL) {
TryAgain = TRUE;
} else {
*Status = EFI_OUT_OF_RESOURCES;
}
}
//
// If there's an error, free the buffer
//
if (!TryAgain && EFI_ERROR (*Status) && (*Buffer != NULL)) {
FreePool (*Buffer);
*Buffer = NULL;
}
return TryAgain;
}
/**
This function gets the file information from an open file descriptor,
and stores it in a buffer allocated from pool.
@param[in] FHand File Handle.
@return A pointer to a buffer with file information or NULL is returned.
**/
EFI_FILE_INFO *
FileInfo (
IN EFI_FILE_HANDLE FHand
)
{
EFI_STATUS Status;
EFI_FILE_INFO *Buffer;
UINTN BufferSize;
//
// Initialize for GrowBuffer loop
//
Buffer = NULL;
BufferSize = SIZE_OF_EFI_FILE_INFO + 200;
//
// Call the real function
//
while (GrowBuffer (&Status, (VOID **) &Buffer, BufferSize)) {
Status = FHand->GetInfo (
FHand,
&gEfiFileInfoGuid,
&BufferSize,
Buffer
);
}
return Buffer;
}
/**
This function will open a file or directory referenced by DevicePath.
This function opens a file with the open mode according to the file path. The
Attributes is valid only for EFI_FILE_MODE_CREATE.
@param[in, out] FilePath On input, the device path to the file.
On output, the remaining device path.
@param[out] FileHandle Pointer to the file handle.
@param[in] OpenMode The mode to open the file with.
@param[in] Attributes The file's file attributes.
@retval EFI_SUCCESS The information was set.
@retval EFI_INVALID_PARAMETER One of the parameters has an invalid value.
@retval EFI_UNSUPPORTED Could not open the file path.
@retval EFI_NOT_FOUND The specified file could not be found on the
device or the file system could not be found
on the device.
@retval EFI_NO_MEDIA The device has no medium.
@retval EFI_MEDIA_CHANGED The device has a different medium in it or
the medium is no longer supported.
@retval EFI_DEVICE_ERROR The device reported an error.
@retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
@retval EFI_WRITE_PROTECTED The file or medium is write protected.
@retval EFI_ACCESS_DENIED The file was opened read only.
@retval EFI_OUT_OF_RESOURCES Not enough resources were available to open
the file.
@retval EFI_VOLUME_FULL The volume is full.
**/
EFI_STATUS
EFIAPI
OpenFileByDevicePath(
IN OUT EFI_DEVICE_PATH_PROTOCOL **FilePath,
OUT EFI_FILE_HANDLE *FileHandle,
IN UINT64 OpenMode,
IN UINT64 Attributes
)
{
EFI_STATUS Status;
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *EfiSimpleFileSystemProtocol;
EFI_FILE_PROTOCOL *Handle1;
EFI_FILE_PROTOCOL *Handle2;
EFI_HANDLE DeviceHandle;
if ((FilePath == NULL || FileHandle == NULL)) {
return EFI_INVALID_PARAMETER;
}
Status = gBS->LocateDevicePath (
&gEfiSimpleFileSystemProtocolGuid,
FilePath,
&DeviceHandle
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = gBS->OpenProtocol(
DeviceHandle,
&gEfiSimpleFileSystemProtocolGuid,
(VOID**)&EfiSimpleFileSystemProtocol,
gImageHandle,
NULL,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = EfiSimpleFileSystemProtocol->OpenVolume(EfiSimpleFileSystemProtocol, &Handle1);
if (EFI_ERROR (Status)) {
FileHandle = NULL;
return Status;
}
//
// go down directories one node at a time.
//
while (!IsDevicePathEnd (*FilePath)) {
//
// For file system access each node should be a file path component
//
if (DevicePathType (*FilePath) != MEDIA_DEVICE_PATH ||
DevicePathSubType (*FilePath) != MEDIA_FILEPATH_DP
) {
FileHandle = NULL;
return (EFI_INVALID_PARAMETER);
}
//
// Open this file path node
//
Handle2 = Handle1;
Handle1 = NULL;
//
// Try to test opening an existing file
//
Status = Handle2->Open (
Handle2,
&Handle1,
((FILEPATH_DEVICE_PATH*)*FilePath)->PathName,
OpenMode &~EFI_FILE_MODE_CREATE,
0
);
//
// see if the error was that it needs to be created
//
if ((EFI_ERROR (Status)) && (OpenMode != (OpenMode &~EFI_FILE_MODE_CREATE))) {
Status = Handle2->Open (
Handle2,
&Handle1,
((FILEPATH_DEVICE_PATH*)*FilePath)->PathName,
OpenMode,
Attributes
);
}
//
// Close the last node
//
Handle2->Close (Handle2);
if (EFI_ERROR(Status)) {
return (Status);
}
//
// Get the next node
//
*FilePath = NextDevicePathNode (*FilePath);
}
//
// This is a weak spot since if the undefined SHELL_FILE_HANDLE format changes this must change also!
//
*FileHandle = (VOID*)Handle1;
return EFI_SUCCESS;
}