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https://github.com/reactos/reactos.git
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- Plug in RAM disk boot support (kernel-side)
svn path=/trunk/; revision=34202
This commit is contained in:
ReactOS Portable Systems Group
parent
662c3b62fe
commit
3cc3ad057f
3 changed files with 289 additions and 0 deletions
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@ -56,6 +56,30 @@
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//
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#define IO_METHOD_FROM_CTL_CODE(c) (c & 0x00000003)
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//
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// Bugcheck codes for RAM disk booting
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//
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//
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// No LoaderXIPRom descriptor was found in the loader memory list
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//
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#define RD_NO_XIPROM_DESCRIPTOR 1
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//
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// Unable to open the RAM disk driver (ramdisk.sys or \Device\Ramdisk)
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//
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#define RD_NO_RAMDISK_DRIVER 2
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//
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// FSCTL_CREATE_RAM_DISK failed
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//
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#define RD_FSCTL_FAILED 3
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//
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// Unable to create GUID string from binary GUID
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//
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#define RD_GUID_CONVERT_FAILED 4
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//
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// Unable to create symbolic link pointing to the RAM disk device
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//
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#define RD_SYMLINK_CREATE_FAILED 5
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//
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// Packet Types when piggybacking on the IRP Overlay
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//
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@ -986,6 +1010,15 @@ IopDeleteIoCompletion(
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PVOID ObjectBody
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);
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//
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// Ramdisk Routines
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//
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NTSTATUS
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NTAPI
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IopStartRamdisk(
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IN PLOADER_PARAMETER_BLOCK LoaderBlock
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);
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//
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// Global I/O Data
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//
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255
reactos/ntoskrnl/io/iomgr/ramdisk.c
Normal file
255
reactos/ntoskrnl/io/iomgr/ramdisk.c
Normal file
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@ -0,0 +1,255 @@
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/*
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* PROJECT: ReactOS Kernel
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* LICENSE: BSD - See COPYING.ARM in the top level directory
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* FILE: ntoskrnl/io/iomgr/ramdisk.c
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* PURPOSE: Allows booting from RAM disk
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* PROGRAMMERS: ReactOS Portable Systems Group
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*/
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/* INCLUDES *******************************************************************/
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#include <ntoskrnl.h>
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#include <initguid.h>
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#include <ntddrdsk.h>
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#define NDEBUG
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#include <debug.h>
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/* DATA ***********************************************************************/
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#if defined (ALLOC_PRAGMA)
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#pragma alloc_text(INIT, IopStartRamdisk)
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#endif
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/* FUNCTIONS ******************************************************************/
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NTSTATUS
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NTAPI
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IopStartRamdisk(IN PLOADER_PARAMETER_BLOCK LoaderBlock)
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{
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PMEMORY_ALLOCATION_DESCRIPTOR MemoryDescriptor;
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NTSTATUS Status;
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PCHAR CommandLine, Offset, OffsetValue, Length, LengthValue;
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HANDLE DriverHandle;
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RAMDISK_CREATE_INPUT RamdiskCreate;
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IO_STATUS_BLOCK IoStatusBlock;
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UNICODE_STRING GuidString, SymbolicLinkName, ObjectName, DeviceString;
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PLIST_ENTRY ListHead, NextEntry;
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OBJECT_ATTRIBUTES ObjectAttributes;
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WCHAR SourceString[54];
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//
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// Scan memory descriptors
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//
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MemoryDescriptor = NULL;
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ListHead = &LoaderBlock->MemoryDescriptorListHead;
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NextEntry = ListHead->Flink;
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while (NextEntry != ListHead)
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{
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//
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// Get the descriptor
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//
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MemoryDescriptor = CONTAINING_RECORD(NextEntry,
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MEMORY_ALLOCATION_DESCRIPTOR,
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ListEntry);
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//
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// Needs to be a ROM/RAM descriptor
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//
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if (MemoryDescriptor->MemoryType == LoaderXIPRom) break;
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//
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// Keep trying
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//
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NextEntry = NextEntry->Flink;
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}
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//
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// Nothing found?
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//
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if (NextEntry == ListHead)
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{
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//
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// Bugcheck -- no data
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//
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KeBugCheckEx(RAMDISK_BOOT_INITIALIZATION_FAILED,
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RD_NO_XIPROM_DESCRIPTOR,
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STATUS_INVALID_PARAMETER,
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0,
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0);
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}
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//
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// Setup the input buffer
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//
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RtlZeroMemory(&RamdiskCreate, sizeof(RamdiskCreate));
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RamdiskCreate.Version = sizeof(RamdiskCreate);
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RamdiskCreate.DiskType = FILE_DEVICE_CD_ROM_FILE_SYSTEM;
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RamdiskCreate.BasePage = MemoryDescriptor->BasePage;
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RamdiskCreate.DiskOffset = 0;
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RamdiskCreate.DiskLength = MemoryDescriptor->PageCount << PAGE_SHIFT;
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RamdiskCreate.DiskGuid = RAMDISK_BOOTDISK_GUID;
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RamdiskCreate.DriveLetter = L'C';
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RamdiskCreate.Options.Fixed = TRUE;
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//
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// Check for commandline parameters
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//
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CommandLine = LoaderBlock->LoadOptions;
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if (CommandLine)
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{
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//
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// Make everything upper case
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//
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_strupr(CommandLine);
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//
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// Check for offset parameter
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//
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Offset = strstr(CommandLine, "RDIMAGEOFFSET");
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if (Offset)
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{
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//
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// Get to the actual value
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//
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OffsetValue = strstr(Offset, "=");
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if (OffsetValue)
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{
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//
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// Set the offset
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//
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RamdiskCreate.DiskOffset = atol(OffsetValue + 1);
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}
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}
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//
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// Reduce the disk length
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//
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RamdiskCreate.DiskLength -= RamdiskCreate.DiskOffset;
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//
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// Check for length parameter
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//
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Length = strstr(CommandLine, "RDIMAGELENGTH");
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if (Length)
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{
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//
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// Get to the actual value
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//
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LengthValue = strstr(Length, "=");
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if (LengthValue)
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{
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//
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// Set the offset
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//
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RamdiskCreate.DiskLength = _atoi64(LengthValue + 1);
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}
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}
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}
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//
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// Setup object attributes
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//
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RtlInitUnicodeString(&ObjectName, L"\\Device\\Ramdisk");
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InitializeObjectAttributes(&ObjectAttributes,
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&ObjectName,
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OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE,
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NULL,
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NULL);
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//
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// Open a handle to the driver
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//
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Status = ZwOpenFile(&DriverHandle,
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GENERIC_ALL,
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&ObjectAttributes,
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&IoStatusBlock,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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FILE_SYNCHRONOUS_IO_NONALERT);
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if (!(NT_SUCCESS(Status)) || !(NT_SUCCESS(IoStatusBlock.Status)))
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{
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//
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// Bugcheck -- no driver
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//
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KeBugCheckEx(RAMDISK_BOOT_INITIALIZATION_FAILED,
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RD_NO_RAMDISK_DRIVER,
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IoStatusBlock.Status,
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0,
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0);
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}
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//
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// Send create command
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//
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Status = ZwDeviceIoControlFile(DriverHandle,
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NULL,
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NULL,
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NULL,
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&IoStatusBlock,
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FSCTL_CREATE_RAM_DISK,
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&RamdiskCreate,
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sizeof(RamdiskCreate),
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NULL,
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0);
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ZwClose(DriverHandle);
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if (!(NT_SUCCESS(Status)) || !(NT_SUCCESS(IoStatusBlock.Status)))
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{
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//
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// Bugcheck -- driver failed
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//
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KeBugCheckEx(RAMDISK_BOOT_INITIALIZATION_FAILED,
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RD_FSCTL_FAILED,
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IoStatusBlock.Status,
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0,
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0);
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}
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//
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// Convert the GUID
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//
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Status = RtlStringFromGUID(&RamdiskCreate.DiskGuid, &GuidString);
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if (!NT_SUCCESS(Status))
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{
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//
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// Bugcheck -- GUID convert failed
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//
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KeBugCheckEx(RAMDISK_BOOT_INITIALIZATION_FAILED,
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RD_GUID_CONVERT_FAILED,
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Status,
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0,
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0);
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}
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//
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// Build the symbolic link name and target
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//
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_snwprintf(SourceString,
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sizeof(SourceString),
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L"\\Device\\Ramdisk%wZ",
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&GuidString);
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SymbolicLinkName.Length = 38;
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SymbolicLinkName.MaximumLength = 38 + sizeof(UNICODE_NULL);
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SymbolicLinkName.Buffer = L"\\ArcName\\ramdisk(0)";
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//
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// Create the symbolic link
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//
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RtlInitUnicodeString(&DeviceString, SourceString);
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Status = IoCreateSymbolicLink(&SymbolicLinkName, &DeviceString);
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RtlFreeUnicodeString(&GuidString);
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if (!NT_SUCCESS(Status))
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{
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//
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// Bugcheck -- symlink create failed
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//
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KeBugCheckEx(RAMDISK_BOOT_INITIALIZATION_FAILED,
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RD_SYMLINK_CREATE_FAILED,
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Status,
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0,
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0);
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}
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//
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// We made it
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//
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return STATUS_SUCCESS;
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}
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@ -256,6 +256,7 @@
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<file>iowork.c</file>
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<file>irp.c</file>
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<file>irq.c</file>
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<file>ramdisk.c</file>
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<file>rawfs.c</file>
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<file>remlock.c</file>
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<file>util.c</file>
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