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reactos/subsystems/mvdm/ntvdm/hardware/disk.c

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/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: subsystems/mvdm/ntvdm/hardware/disk.c
* PURPOSE: Generic Disk Controller (Floppy, Hard Disk, ...)
* PROGRAMMERS: Hermes Belusca-Maito (hermes.belusca@sfr.fr)
*
* NOTE 1: This file is meant to be splitted into FDC and HDC
* when its code will grow out of control!
*
* NOTE 2: This is poor-man implementation, i.e. at the moment this file
* contains an API for manipulating the disks for the rest of NTVDM,
* but does not implement real hardware emulation (IO ports, etc...).
* One will have to progressively transform it into a real HW emulation
* and, in case the disk APIs are needed, move them elsewhere.
*
* FIXME: The big endian support (which is hardcoded here for machines
* in little endian) *MUST* be fixed!
*/
/* INCLUDES *******************************************************************/
#include "ntvdm.h"
#define NDEBUG
#include <debug.h>
#include "emulator.h"
#include "disk.h"
// #include "io.h"
#include "memory.h"
#include "utils.h"
/**************** HARD DRIVES -- VHD FIXED DISK FORMAT SUPPORT ****************/
// http://citrixblogger.org/2008/12/01/dynamic-vhd-walkthrough/
// http://www.microsoft.com/en-us/download/details.aspx?id=23850
// https://projects.honeynet.org/svn/sebek/virtualization/qebek/trunk/block/vpc.c
// https://git.virtualopensystems.com/trescca/qemu/raw/40645c7bfd7c4d45381927e1e80081fa827c368a/block/vpc.c
// https://gitweb.gentoo.org/proj/qemu-kvm.git/tree/block/vpc.c?h=qemu-kvm-0.12.4-gentoo&id=827dccd6740639c64732418539bf17e6e4c99d77
#pragma pack(push, 1)
enum VHD_TYPE
{
VHD_FIXED = 2,
VHD_DYNAMIC = 3,
VHD_DIFFERENCING = 4,
};
// Seconds since Jan 1, 2000 0:00:00 (UTC)
#define VHD_TIMESTAMP_BASE 946684800
// Always in BIG-endian format!
typedef struct _VHD_FOOTER
{
CHAR creator[8]; // "conectix"
ULONG features;
ULONG version;
// Offset of next header structure, 0xFFFFFFFF if none
ULONG64 data_offset;
// Seconds since Jan 1, 2000 0:00:00 (UTC)
ULONG timestamp;
CHAR creator_app[4]; // "vpc "; "win"
USHORT major;
USHORT minor;
CHAR creator_os[4]; // "Wi2k"
ULONG64 orig_size;
ULONG64 size;
USHORT cyls;
BYTE heads;
BYTE secs_per_cyl;
ULONG type; // VHD_TYPE
// Checksum of the Hard Disk Footer ("one's complement of the sum of all
// the bytes in the footer without the checksum field")
ULONG checksum;
// UUID used to identify a parent hard disk (backing file)
BYTE uuid[16];
BYTE in_saved_state;
BYTE Padding[0x200-0x55];
} VHD_FOOTER, *PVHD_FOOTER;
C_ASSERT(sizeof(VHD_FOOTER) == 0x200);
#pragma pack(pop)
#if 0
/*
* Calculates the number of cylinders, heads and sectors per cylinder
* based on a given number of sectors. This is the algorithm described
* in the VHD specification.
*
* Note that the geometry doesn't always exactly match total_sectors but
* may round it down.
*
* Returns TRUE on success, FALSE if the size is larger than 127 GB
*/
static BOOLEAN
calculate_geometry(ULONG64 total_sectors, PUSHORT cyls,
PBYTE heads, PBYTE secs_per_cyl)
{
ULONG cyls_times_heads;
if (total_sectors > 65535 * 16 * 255)
return FALSE;
if (total_sectors > 65535 * 16 * 63)
{
*secs_per_cyl = 255;
*heads = 16;
cyls_times_heads = total_sectors / *secs_per_cyl;
}
else
{
*secs_per_cyl = 17;
cyls_times_heads = total_sectors / *secs_per_cyl;
*heads = (cyls_times_heads + 1023) / 1024;
if (*heads < 4)
*heads = 4;
if (cyls_times_heads >= (*heads * 1024) || *heads > 16)
{
*secs_per_cyl = 31;
*heads = 16;
cyls_times_heads = total_sectors / *secs_per_cyl;
}
if (cyls_times_heads >= (*heads * 1024))
{
*secs_per_cyl = 63;
*heads = 16;
cyls_times_heads = total_sectors / *secs_per_cyl;
}
}
*cyls = cyls_times_heads / *heads;
return TRUE;
}
#endif
/*************************** FLOPPY DISK CONTROLLER ***************************/
// A Floppy Controller can support up to 4 floppy drives.
static DISK_IMAGE XDCFloppyDrive[4];
// Taken from DOSBox
typedef struct _DISK_GEO
{
DWORD ksize; /* Size in kilobytes */
WORD secttrack; /* Sectors per track */
WORD headscyl; /* Heads per cylinder */
WORD cylcount; /* Cylinders per side */
WORD biosval; /* Type to return from BIOS & CMOS */
} DISK_GEO, *PDISK_GEO;
// FIXME: At the moment, all of our diskettes have 512 bytes per sector...
static WORD HackSectorSize = 512;
static DISK_GEO DiskGeometryList[] =
{
{ 160, 8, 1, 40, 0},
{ 180, 9, 1, 40, 0},
{ 200, 10, 1, 40, 0},
{ 320, 8, 2, 40, 1},
{ 360, 9, 2, 40, 1},
{ 400, 10, 2, 40, 1},
{ 720, 9, 2, 80, 3},
{1200, 15, 2, 80, 2},
{1440, 18, 2, 80, 4},
{2880, 36, 2, 80, 6},
};
BOOLEAN
MountFDI(IN PDISK_IMAGE DiskImage,
IN HANDLE hFile)
{
ULONG FileSize;
USHORT i;
/*
* Retrieve the size of the file. In NTVDM we will handle files
* of maximum 1Mb so we can largely use GetFileSize only.
*/
FileSize = GetFileSize(hFile, NULL);
if (FileSize == INVALID_FILE_SIZE && GetLastError() != ERROR_SUCCESS)
{
/* We failed, bail out */
DisplayMessage(L"MountFDI: Error when retrieving file size, or size too large (%d).", FileSize);
return FALSE;
}
/* Convert the size in kB */
FileSize /= 1024;
/* Find the floppy format in the list, and mount it if found */
for (i = 0; i < ARRAYSIZE(DiskGeometryList); ++i)
{
if (DiskGeometryList[i].ksize == FileSize ||
DiskGeometryList[i].ksize + 1 == FileSize)
{
/* Found, mount it */
DiskImage->DiskType = DiskGeometryList[i].biosval;
DiskImage->DiskInfo.Cylinders = DiskGeometryList[i].cylcount;
DiskImage->DiskInfo.Heads = DiskGeometryList[i].headscyl;
DiskImage->DiskInfo.Sectors = DiskGeometryList[i].secttrack;
DiskImage->DiskInfo.SectorSize = HackSectorSize;
/* Set the file pointer to the beginning */
SetFilePointer(hFile, 0, NULL, FILE_BEGIN);
DiskImage->hDisk = hFile;
return TRUE;
}
}
/* If we are here, we failed to find a suitable format. Bail out. */
DisplayMessage(L"MountFDI: Floppy image of invalid size %d.", FileSize);
return FALSE;
}
/************************** IDE HARD DISK CONTROLLER **************************/
// An IDE Hard Disk Controller can support up to 4 drives:
// Primary Master Drive, Primary Slave Drive,
// Secondary Master Drive, Secondary Slave Drive.
static DISK_IMAGE XDCHardDrive[4];
BOOLEAN
MountHDD(IN PDISK_IMAGE DiskImage,
IN HANDLE hFile)
{
/**** Support for VHD fixed disks ****/
DWORD FilePointer, BytesToRead;
VHD_FOOTER vhd_footer;
/* Go to the end of the file and retrieve the footer */
FilePointer = SetFilePointer(hFile, -(LONG)sizeof(VHD_FOOTER), NULL, FILE_END);
if (FilePointer == INVALID_SET_FILE_POINTER)
{
DPRINT1("MountHDD: Error when seeking HDD footer, last error = %d\n", GetLastError());
return FALSE;
}
/* Read footer */
// FIXME: We may consider just mapping section to the file...
BytesToRead = sizeof(VHD_FOOTER);
if (!ReadFile(hFile, &vhd_footer, BytesToRead, &BytesToRead, NULL))
{
DPRINT1("MountHDD: Error when reading HDD footer, last error = %d\n", GetLastError());
return FALSE;
}
/* Perform validity checks */
if (RtlCompareMemory(vhd_footer.creator, "conectix",
sizeof(vhd_footer.creator)) != sizeof(vhd_footer.creator))
{
DisplayMessage(L"MountHDD: Invalid HDD image (expected VHD).");
return FALSE;
}
if (vhd_footer.version != 0x00000100 &&
vhd_footer.version != 0x00000500) // FIXME: Big endian!
{
DisplayMessage(L"MountHDD: VHD HDD image of unexpected version %d.", vhd_footer.version);
return FALSE;
}
if (RtlUlongByteSwap(vhd_footer.type) != VHD_FIXED) // FIXME: Big endian!
{
DisplayMessage(L"MountHDD: Only VHD HDD fixed images are supported.");
return FALSE;
}
if (vhd_footer.data_offset != 0xFFFFFFFFFFFFFFFF)
{
DisplayMessage(L"MountHDD: Unexpected data offset for VHD HDD fixed image.");
return FALSE;
}
if (vhd_footer.orig_size != vhd_footer.size)
{
DisplayMessage(L"MountHDD: VHD HDD fixed image size should be the same as its original size.");
return FALSE;
}
// FIXME: Checksum!
/* Found, mount it */
DiskImage->DiskType = 0;
DiskImage->DiskInfo.Cylinders = RtlUshortByteSwap(vhd_footer.cyls); // FIXME: Big endian!
DiskImage->DiskInfo.Heads = vhd_footer.heads;
DiskImage->DiskInfo.Sectors = vhd_footer.secs_per_cyl;
DiskImage->DiskInfo.SectorSize = RtlUlonglongByteSwap(vhd_footer.size) / // FIXME: Big endian!
DiskImage->DiskInfo.Cylinders /
DiskImage->DiskInfo.Heads / DiskImage->DiskInfo.Sectors;
/* Set the file pointer to the beginning */
SetFilePointer(hFile, 0, NULL, FILE_BEGIN);
DiskImage->hDisk = hFile;
return TRUE;
}
/************************ GENERIC DISK CONTROLLER API *************************/
BOOLEAN
IsDiskPresent(IN PDISK_IMAGE DiskImage)
{
ASSERT(DiskImage);
return (DiskImage->hDisk != INVALID_HANDLE_VALUE && DiskImage->hDisk != NULL);
}
BYTE
SeekDisk(IN PDISK_IMAGE DiskImage,
IN WORD Cylinder,
IN BYTE Head,
IN BYTE Sector)
{
DWORD FilePointer;
/* Check that the sector number is 1-based */
// FIXME: Or do it in the caller?
if (Sector == 0)
{
/* Return error */
return 0x01;
}
/* Set position */
// Compute the offset
FilePointer = (DWORD)((DWORD)((DWORD)Cylinder * DiskImage->DiskInfo.Heads + Head)
* DiskImage->DiskInfo.Sectors + (Sector - 1))
* DiskImage->DiskInfo.SectorSize;
FilePointer = SetFilePointer(DiskImage->hDisk, FilePointer, NULL, FILE_BEGIN);
if (FilePointer == INVALID_SET_FILE_POINTER)
{
/* Return error */
return 0x40;
}
return 0x00;
}
BYTE
ReadDisk(IN PDISK_IMAGE DiskImage,
IN WORD Cylinder,
IN BYTE Head,
IN BYTE Sector,
IN BYTE NumSectors)
{
BYTE Result;
DWORD BytesToRead;
PVOID LocalBuffer;
BYTE StaticBuffer[1024];
/* Read the sectors */
Result = SeekDisk(DiskImage, Cylinder, Head, Sector);
if (Result != 0x00)
return Result;
BytesToRead = (DWORD)NumSectors * DiskImage->DiskInfo.SectorSize;
// FIXME: Consider just looping around filling each time the buffer...
if (BytesToRead <= sizeof(StaticBuffer))
{
LocalBuffer = StaticBuffer;
}
else
{
LocalBuffer = RtlAllocateHeap(RtlGetProcessHeap(), 0, BytesToRead);
ASSERT(LocalBuffer != NULL);
}
if (ReadFile(DiskImage->hDisk, LocalBuffer, BytesToRead, &BytesToRead, NULL))
{
/* Write to the memory */
EmulatorWriteMemory(&EmulatorContext,
TO_LINEAR(getES(), getBX()),
LocalBuffer,
BytesToRead);
Result = 0x00;
}
else
{
Result = 0x04;
}
if (LocalBuffer != StaticBuffer)
RtlFreeHeap(RtlGetProcessHeap(), 0, LocalBuffer);
/* Return success or error */
return Result;
}
BYTE
WriteDisk(IN PDISK_IMAGE DiskImage,
IN WORD Cylinder,
IN BYTE Head,
IN BYTE Sector,
IN BYTE NumSectors)
{
BYTE Result;
DWORD BytesToWrite;
PVOID LocalBuffer;
BYTE StaticBuffer[1024];
/* Check for write protection */
if (DiskImage->ReadOnly)
{
/* Return error */
return 0x03;
}
/* Write the sectors */
Result = SeekDisk(DiskImage, Cylinder, Head, Sector);
if (Result != 0x00)
return Result;
BytesToWrite = (DWORD)NumSectors * DiskImage->DiskInfo.SectorSize;
// FIXME: Consider just looping around filling each time the buffer...
if (BytesToWrite <= sizeof(StaticBuffer))
{
LocalBuffer = StaticBuffer;
}
else
{
LocalBuffer = RtlAllocateHeap(RtlGetProcessHeap(), 0, BytesToWrite);
ASSERT(LocalBuffer != NULL);
}
/* Read from the memory */
EmulatorReadMemory(&EmulatorContext,
TO_LINEAR(getES(), getBX()),
LocalBuffer,
BytesToWrite);
if (WriteFile(DiskImage->hDisk, LocalBuffer, BytesToWrite, &BytesToWrite, NULL))
Result = 0x00;
else
Result = 0x04;
if (LocalBuffer != StaticBuffer)
RtlFreeHeap(RtlGetProcessHeap(), 0, LocalBuffer);
/* Return success or error */
return Result;
}
typedef BOOLEAN (*MOUNT_DISK_HANDLER)(IN PDISK_IMAGE DiskImage, IN HANDLE hFile);
typedef struct _DISK_MOUNT_INFO
{
PDISK_IMAGE DiskArray;
ULONG NumDisks;
MOUNT_DISK_HANDLER MountDiskHelper;
} DISK_MOUNT_INFO, *PDISK_MOUNT_INFO;
static DISK_MOUNT_INFO DiskMountInfo[MAX_DISK_TYPE] =
{
{XDCFloppyDrive, _ARRAYSIZE(XDCFloppyDrive), MountFDI},
{XDCHardDrive , _ARRAYSIZE(XDCHardDrive) , MountHDD},
};
PDISK_IMAGE
RetrieveDisk(IN DISK_TYPE DiskType,
IN ULONG DiskNumber)
{
ASSERT(DiskType < MAX_DISK_TYPE);
if (DiskNumber >= DiskMountInfo[DiskType].NumDisks)
{
DisplayMessage(L"RetrieveDisk: Disk number %d:%d invalid.", DiskType, DiskNumber);
return NULL;
}
return &DiskMountInfo[DiskType].DiskArray[DiskNumber];
}
BOOLEAN
MountDisk(IN DISK_TYPE DiskType,
IN ULONG DiskNumber,
IN PCWSTR FileName,
IN BOOLEAN ReadOnly)
{
BOOLEAN Success = FALSE;
PDISK_IMAGE DiskImage;
HANDLE hFile;
BY_HANDLE_FILE_INFORMATION FileInformation;
ASSERT(DiskType < MAX_DISK_TYPE);
if (DiskNumber >= DiskMountInfo[DiskType].NumDisks)
{
DisplayMessage(L"MountDisk: Disk number %d:%d invalid.", DiskType, DiskNumber);
return FALSE;
}
DiskImage = &DiskMountInfo[DiskType].DiskArray[DiskNumber];
if (IsDiskPresent(DiskImage))
{
DPRINT1("MountDisk: Disk %d:%d:0x%p already in use, recycling...\n", DiskType, DiskNumber, DiskImage);
UnmountDisk(DiskType, DiskNumber);
}
/* Try to open the file */
SetLastError(0); // For debugging purposes
if (ReadOnly)
{
hFile = CreateFileW(FileName,
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
}
else
{
hFile = CreateFileW(FileName,
GENERIC_READ | GENERIC_WRITE,
0, // No sharing access
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
}
DPRINT1("File '%S' opening %s ; GetLastError() = %u\n",
FileName, hFile != INVALID_HANDLE_VALUE ? "succeeded" : "failed", GetLastError());
/* If we failed, bail out */
if (hFile == INVALID_HANDLE_VALUE)
{
DisplayMessage(L"MountDisk: Error when opening disk file '%s' (Error: %u).", FileName, GetLastError());
return FALSE;
}
/* OK, we have a handle to the file */
/*
* Check that it is really a file, and not a physical drive.
* For obvious security reasons, we do not want to be able to
* write directly to physical drives.
*
* Redundant checks
*/
SetLastError(0);
if (!GetFileInformationByHandle(hFile, &FileInformation) &&
GetLastError() == ERROR_INVALID_FUNCTION)
{
/* Objects other than real files are not supported */
DisplayMessage(L"MountDisk: '%s' is not a valid disk file.", FileName);
goto Quit;
}
SetLastError(0);
if (GetFileSize(hFile, NULL) == INVALID_FILE_SIZE &&
GetLastError() == ERROR_INVALID_FUNCTION)
{
/* Objects other than real files are not supported */
DisplayMessage(L"MountDisk: '%s' is not a valid disk file.", FileName);
goto Quit;
}
/* Success, mount the image */
if (!DiskMountInfo[DiskType].MountDiskHelper(DiskImage, hFile))
{
DisplayMessage(L"MountDisk: Failed to mount disk file '%s' in 0x%p.", FileName, DiskImage);
goto Quit;
}
/* Update its read/write state */
DiskImage->ReadOnly = ReadOnly;
Success = TRUE;
Quit:
if (!Success) FileClose(hFile);
return Success;
}
BOOLEAN
UnmountDisk(IN DISK_TYPE DiskType,
IN ULONG DiskNumber)
{
PDISK_IMAGE DiskImage;
ASSERT(DiskType < MAX_DISK_TYPE);
if (DiskNumber >= DiskMountInfo[DiskType].NumDisks)
{
DisplayMessage(L"UnmountDisk: Disk number %d:%d invalid.", DiskType, DiskNumber);
return FALSE;
}
DiskImage = &DiskMountInfo[DiskType].DiskArray[DiskNumber];
if (!IsDiskPresent(DiskImage))
{
DPRINT1("UnmountDisk: Disk %d:%d:0x%p is already unmounted\n", DiskType, DiskNumber, DiskImage);
return FALSE;
}
/* Flush the image and unmount it */
FlushFileBuffers(DiskImage->hDisk);
FileClose(DiskImage->hDisk);
DiskImage->hDisk = NULL;
return TRUE;
}
/* PUBLIC FUNCTIONS ***********************************************************/
BOOLEAN DiskCtrlInitialize(VOID)
{
return TRUE;
}
VOID DiskCtrlCleanup(VOID)
{
ULONG DiskNumber;
/* Unmount all the floppy disk drives */
for (DiskNumber = 0; DiskNumber < DiskMountInfo[FLOPPY_DISK].NumDisks; ++DiskNumber)
UnmountDisk(FLOPPY_DISK, DiskNumber);
/* Unmount all the hard disk drives */
for (DiskNumber = 0; DiskNumber < DiskMountInfo[HARD_DISK].NumDisks; ++DiskNumber)
UnmountDisk(HARD_DISK, DiskNumber);
}
/* EOF */
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