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/** @file
EFI block I/O helpers routines/wrappers
Copyright (c) 2016. Disk Cryptography Services for EFI (DCS), Alex Kolotnikov
Copyright (c) 2016. VeraCrypt, Mounir IDRASSI
This program and the accompanying materials are licensed and made available
under the terms and conditions of the GNU Lesser General Public License, version 3.0 (LGPL-3.0).
The full text of the license may be found at
https://opensource.org/licenses/LGPL-3.0
**/
#include <Library/CommonLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/DevicePathLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/BaseMemoryLib.h>
#include <Protocol/LoadedImage.h>
//////////////////////////////////////////////////////////////////////////
// Print handle info
//////////////////////////////////////////////////////////////////////////
VOID
EfiPrintDevicePath(
IN EFI_HANDLE handle)
{
CHAR16 *StrPath;
EFI_DEVICE_PATH *DevicePath;
OUT_PRINT(L"(%0X): ", handle);
DevicePath = DevicePathFromHandle(handle);
if (DevicePath == NULL) {
ERR_PRINT(L"No path found");
return;
}
StrPath = ConvertDevicePathToText(DevicePath, FALSE, FALSE);
OUT_PRINT(StrPath);
MEM_FREE(StrPath);
}
VOID
EfiPrintProtocols(
IN EFI_HANDLE handle)
{
EFI_GUID **guids;
UINTN count;
EFI_STATUS status;
status = gBS->ProtocolsPerHandle(handle, &guids, &count);
if (!EFI_ERROR(status)) {
UINTN i;
for (i = 0; i < count; ++i) {
OUT_PRINT(L"%d: %g\n", i, guids[i]);
}
FreePool(guids);
}
}
//////////////////////////////////////////////////////////////////////////
// Handles
//////////////////////////////////////////////////////////////////////////
EFI_STATUS
EfiGetHandles(
IN EFI_LOCATE_SEARCH_TYPE SearchType,
IN EFI_GUID *Protocol, OPTIONAL
IN VOID *SearchKey, OPTIONAL
OUT EFI_HANDLE **Buffer,
OUT UINTN *Count
)
{
EFI_STATUS res = EFI_BUFFER_TOO_SMALL;
UINTN BufferSize;
if(*Buffer != NULL) MEM_FREE(*Buffer);
*Count = 0;
*Buffer = (EFI_HANDLE*) MEM_ALLOC(sizeof(EFI_HANDLE));
if (*Buffer) {
BufferSize = sizeof(EFI_HANDLE);
res = gBS->LocateHandle(SearchType, Protocol, SearchKey, &BufferSize, *Buffer);
if (res == RETURN_BUFFER_TOO_SMALL) {
MEM_FREE(*Buffer);
*Buffer = (EFI_HANDLE*)MEM_ALLOC(BufferSize);
if (!Buffer) {
return EFI_OUT_OF_RESOURCES;
}
res = gBS->LocateHandle(SearchType, Protocol, SearchKey, &BufferSize, *Buffer);
if(res != EFI_SUCCESS) {
MEM_FREE(*Buffer);
*Buffer = (EFI_HANDLE*)NULL;
return res;
}
} else if (EFI_ERROR(res)) {
MEM_FREE(*Buffer);
*Buffer = (EFI_HANDLE*)NULL;
return res;
}
*Count = (UINTN)(BufferSize / sizeof(EFI_HANDLE));
}
return res;
}
EFI_STATUS
EfiGetStartDevice(
OUT EFI_HANDLE* handle)
{
EFI_STATUS Status;
EFI_LOADED_IMAGE_PROTOCOL *LoadedImage;
Status = gBS->HandleProtocol(gImageHandle, &gEfiLoadedImageProtocolGuid, (VOID **)&LoadedImage);
if (EFI_ERROR(Status)) {
return Status;
}
*handle = LoadedImage->DeviceHandle;
return Status;
}
//////////////////////////////////////////////////////////////////////////
// Block I/O
//////////////////////////////////////////////////////////////////////////
EFI_BLOCK_IO_PROTOCOL*
EfiGetBlockIO(
IN EFI_HANDLE handle
)
{
EFI_STATUS res;
EFI_BLOCK_IO_PROTOCOL* blockIOProtocol = NULL;
res = gBS->HandleProtocol(handle, &gEfiBlockIoProtocolGuid, (VOID**)&blockIOProtocol);
if (res == RETURN_SUCCESS &&
blockIOProtocol != NULL &&
blockIOProtocol->Media->MediaPresent) {
return blockIOProtocol;
}
return NULL;
}
EFI_HANDLE* gBIOHandles;
UINTN gBIOCount;
EFI_STATUS
InitBio() {
EFI_STATUS res;
res = EfiGetHandles(ByProtocol, &gEfiBlockIoProtocolGuid, 0, &gBIOHandles, &gBIOCount);
return res;
}
BOOLEAN
EfiIsPartition(
IN EFI_HANDLE h
)
{
EFI_DEVICE_PATH_PROTOCOL* node;
node = DevicePathFromHandle(h);
if (node == NULL) return FALSE;
while (!IsDevicePathEnd(node)) {
if (node->Type == MEDIA_DEVICE_PATH && node->SubType == MEDIA_HARDDRIVE_DP) {
return TRUE;
}
node = NextDevicePathNode(node);
}
return FALSE;
}
EFI_STATUS
EfiGetPartDetails(
IN EFI_HANDLE h,
OUT HARDDRIVE_DEVICE_PATH* dpVolme,
OUT EFI_HANDLE* hDisk)
{
EFI_DEVICE_PATH_PROTOCOL* node;
EFI_DEVICE_PATH_PROTOCOL* dpVolume;
EFI_DEVICE_PATH_PROTOCOL* dpDisk;
EFI_STATUS res;
dpVolume = DevicePathFromHandle(h);
dpDisk = DuplicateDevicePath(dpVolume);
node = (EFI_DEVICE_PATH_PROTOCOL *)dpDisk;
while (!IsDevicePathEnd(node)) {
if (node->Type == MEDIA_DEVICE_PATH && node->SubType == MEDIA_HARDDRIVE_DP) {
CopyMem(dpVolme, node, sizeof(HARDDRIVE_DEVICE_PATH));
SetDevicePathEndNode(node);
res = gBS->LocateDevicePath(&gEfiBlockIoProtocolGuid, &dpDisk, hDisk);
return res;
}
node = NextDevicePathNode(node);
}
return EFI_NOT_FOUND;
}
EFI_STATUS
EfiGetPartGUID(
IN EFI_HANDLE h,
OUT EFI_GUID* guid)
{
EFI_DEVICE_PATH_PROTOCOL* node;
EFI_DEVICE_PATH_PROTOCOL* dpVolume;
if (guid == NULL) return EFI_INVALID_PARAMETER;
dpVolume = DevicePathFromHandle(h);
node = (EFI_DEVICE_PATH_PROTOCOL *)dpVolume;
while (!IsDevicePathEnd(node)) {
if (node->Type == MEDIA_DEVICE_PATH && node->SubType == MEDIA_HARDDRIVE_DP) {
HARDDRIVE_DEVICE_PATH* hdpNode = (HARDDRIVE_DEVICE_PATH*)node;
CopyMem(guid, hdpNode->Signature, sizeof(*guid));
return EFI_SUCCESS;
}
node = NextDevicePathNode(node);
}
return EFI_NOT_FOUND;
}
EFI_STATUS
EfiFindPartByGUID(
IN EFI_GUID* guid,
OUT EFI_HANDLE* h
)
{
EFI_STATUS res;
EFI_GUID guidI;
UINTN i;
if (guid == NULL || h == NULL) return EFI_INVALID_PARAMETER;
for (i = 0; i < gBIOCount; ++i) {
res = EfiGetPartGUID(gBIOHandles[i], &guidI);
if (!EFI_ERROR(res)) {
if (CompareMem(&guidI, guid, sizeof(guidI)) == 0) {
*h = gBIOHandles[i];
return EFI_SUCCESS;
}
}
}
return EFI_NOT_FOUND;
}
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