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VirtIOFS.pas
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VirtIOFS.pas
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//
// VirtIOFS.pas
//
// This unit contains the code of the VirtIOFS driver.
//
// Copyright (c) 2003-2019 Matias Vara <matiasevara@gmail.com>
// All Rights Reserved
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
unit VirtIOFS;
interface
{$I ..\Toro.inc}
{$IFDEF EnableDebug}
//{$DEFINE DebugVirtioFS}
{$ENDIF}
uses
{$IFDEF EnableDebug} Debug, {$ENDIF}
FileSystem,
Pci,
Arch, Console, Network, Process, Memory;
implementation
{$MACRO ON}
{$DEFINE EnableInt := asm sti;end;}
{$DEFINE DisableInt := asm pushfq;cli;end;}
{$DEFINE RestoreInt := asm popfq;end;}
type
PByte = ^TByte;
TByte = array[0..0] of byte;
PVirtioFsConfig = ^TVirtioFsConfig;
PVirtIOPciCommonCfg = ^TVirtIOPciCommonCfg;
VirtIOUsedItem = record
Index: Dword;
Length: Dword;
end;
PVirtIOUsed = ^TVirtIOUsed;
TVirtIOUsed = record
Flags: word;
Index: word;
Rings: array[0..0] of VirtIOUsedItem;
end;
PVirtIOAvailable = ^TVirtIOAvailable;
TVirtIOAvailable = record
Flags: Word;
Index: Word;
Rings: Array[0..0] of Word;
end;
PQueueBuffer = ^TQueueBuffer;
TQueueBuffer = record
Address: QWord;
Length: DWord;
Flags: Word;
Next: Word;
end;
PVirtQueue = ^TVirtQueue;
TVirtQueue = record
QueueSize: word;
Buffers: PQueueBuffer;
Available: PVirtIOAvailable;
Used: PVirtIOUsed;
LastUsedIndex: word;
LastAvailableIndex: word;
Buffer: PByte;
ChunkSize: dword;
NextBuffer: word;
Lock: QWord;
end;
TVirtIOFSDevice = record
IRQ: LongInt;
tag: PChar;
NotifyOffMultiplier: DWORD;
FsConfig: PVirtioFsConfig;
CommonConfig: PVirtIOPciCommonCfg;
IsrConfig: ^DWORD;
QueueNotify: ^WORD;
HpQueue: TVirtQueue;
RqQueue: TVirtQueue;
Driver: TFilesystemDriver;
BlkDriver: TBlockDriver;
FileDesc: TFileBlock;
end;
PBufferInfo = ^TBufferInfo;
TBufferInfo = record
Buffer: ^Byte;
Size: QWord;
Flags: Byte;
end;
TVirtIOFsConfig = packed record
tag: array[0..35] of Char;
numQueues: DWORD;
end;
TVirtIOPciCommonCfg = packed record
DeviceFeature_select: DWORD;
DeviceFeature: DWORD;
DriverFeature_select: DWORD;
DriverFeature: DWORD;
MsixConfig: WORD;
NumQueues: WORD;
DeviceStatus: Byte;
ConfigGeneration: Byte;
QueueSelect: WORD;
QueueSize: WORD;
QueueMsixVector: WORD;
QueueEnable: WORD;
QueueNotifyOff: WORD;
QueueDesc: QWORD;
QueueAvail: QWORD;
QueueUsed: QWORD;
end;
TVirtIOPciCap = packed record
CapVndr: Byte;
CapNext: Byte;
CapLen: Byte;
CfgType: Byte;
Bar: Byte;
Padding: array [0..2] of Byte;
Offset: DWORD;
Length: DWORD;
end;
TFuseInHeader = packed record
Len: DWORD;
Opcode: DWORD;
Unique: QWord;
Nodeid: QWord;
Uid: DWORD;
Gid: DWORD;
Pid: DWORD;
Padding: DWORD;
end;
TFuseOutHeader = packed record
Len: DWORD;
Error: DWORD;
Unique: QWord;
end;
TFuseInitIn = packed record
Major: DWORD;
Minor: DWORD;
MaxReadahead: DWORD;
Flags: DWORD;
end;
TFuseInitOut = packed record
Major: DWORD;
Minor: DWORD;
MaxReadahead: DWORD;
Flags: DWORD;
MaxBackground: WORD;
CongestionThreshold: WORD;
MaxWrite: DWORD;
TimeGran: DWORD;
MaxPages: WORD;
Padding: WORD;
Unused: array[0..7] of DWORD;
end;
TFuseGetAttrIn = packed record
GetattrFlags: DWORD;
Dummy: DWORD;
Fh: QWORD;
end;
TFuseAttr = packed record
Ino: QWORD;
Size: QWORD;
Blocks: QWORD;
Atime: QWORD;
Mtime: QWORD;
Ctime: QWORD;
Atimensec: DWORD;
Mtimensec: DWORD;
Ctimensec: DWORD;
Mode: DWORD;
Nlink: DWORD;
Uid: DWORD;
Gid: DWORD;
Rdev: DWORD;
Blksize: DWORD;
Padding: DWORD;
end;
TFuseGetAttrOut = packed record
AttrValid: QWORD;
AttrValid_nsec: DWORD;
Dummy: DWORD;
Attr: TFuseAttr;
end;
TFuseEntryOut = packed record
Nodeid: QWORD;
Generation: QWORD;
EntryValid: QWORD;
AttrValid: QWORD;
EntryValid_nsec: DWORD;
AttrValid_nsec: DWORD;
Attr: TFuseAttr;
end;
TFuseOpenIn = packed record
Flags: DWORD;
Unused: DWORD;
end;
TFuseOpenOut = packed record
Fh: QWORD;
OpenFlags: DWORD;
Padding: DWORD;
end;
TFuseReadIn = packed record
Fh: QWORD;
Offset: QWORD;
Size: DWORD;
ReadFlags: DWORD;
LockOwner: QWORD;
Flags: DWORD;
Padding: DWORD;
end;
TFuseReleaseIn = packed record
Fh: QWORD;
Flags: DWORD;
ReleaseFlags: DWORD;
LockOwner: QWORD;
end;
TFuseMknodIn = packed record
Mode: DWORD;
Rdev: DWORD;
Umask: DWORD;
Padding: DWORD;
end;
TFuseWriteIn = packed record
fh: QWORD;
offset: QWORD;
size: DWORD;
write_flags: DWORD;
lock_owner: QWORD;
flags: DWORD;
padding: DWORD;
end;
TFuseWriteOut = packed record
size: DWORD;
padding: DWORD;
end;
const
VIRTIO_ACKNOWLEDGE = 1;
VIRTIO_DRIVER = 2;
VIRTIO_CTRL_VQ = 17;
VIRTIO_MRG_RXBUF = 15;
VIRTIO_CSUM = 0;
VIRTIO_FEATURES_OK = 8;
VIRTIO_DRIVER_OK = 4;
VIRTIO_DESC_FLAG_WRITE_ONLY = 2;
VIRTIO_DESC_FLAG_NEXT = 1;
VIRTIO_ID_FS = $105a;
VIRTIO_PCI_CAP_DEVICE_CFG = 4;
VIRTIO_PCI_CAP_ISR_CFG = 3;
VIRTIO_PCI_CAP_COMMON_CFG = 1;
VIRTIO_PCI_CAP_NOTIFY_CFG = 2;
PCI_CAP_ID_VNDR = 9;
DEVICE_NEEDS_RESET = 64;
FUSE_ROOT_ID = 1;
// The values come from
// FUSE_KERNEL_VERSION and FUSE_KERNEL_MINOR_VERSION
FUSE_MAJOR_VERSION = 7;
FUSE_MINOR_VERSION = 31;
FUSE_INIT = 26;
FUSE_LOOKUP = 1;
FUSE_OPEN = 14;
FUSE_READ = 15;
FUSE_GETATTR = 3;
FUSE_RELEASE = 18;
FUSE_MKNOD = 8;
FUSE_WRITE = 16;
REQUEST_QUEUE = 0;
// INIT request/reply flags
FUSE_ASYNC_READ = 1 shl 0;
FUSE_POSIX_LOCKS = 1 shl 1;
FUSE_FILE_OPS = 1 shl 2;
FUSE_ATOMIC_O_TRUNC = 1 shl 3;
FUSE_EXPORT_SUPPORT = 1 shl 4;
FUSE_BIG_WRITES = 1 shl 5;
FUSE_DONT_MASK = 1 shl 6;
FUSE_SPLICE_WRITE = 1 shl 7;
FUSE_SPLICE_MOVE = 1 shl 8;
FUSE_SPLICE_READ = 1 shl 9;
FUSE_FLOCK_LOCKS = 1 shl 10;
FUSE_HAS_IOCTL_DIR = 1 shl 11;
FUSE_AUTO_INVAL_DATA = 1 shl 12;
FUSE_DO_READDIRPLUS = 1 shl 13;
FUSE_READDIRPLUS_AUTO = 1 shl 14;
FUSE_ASYNC_DIO = 1 shl 15;
FUSE_WRITEBACK_CACHE = 1 shl 16;
FUSE_NO_OPEN_SUPPORT = 1 shl 17;
FUSE_PARALLEL_DIROPS = 1 shl 18;
FUSE_HANDLE_KILLPRIV = 1 shl 19;
FUSE_POSIX_ACL = 1 shl 20;
FUSE_ABORT_ERROR = 1 shl 21;
FUSE_MAX_PAGES = 1 shl 22;
FUSE_CACHE_SYMLINKS = 1 shl 23;
FUSE_NO_OPENDIR_SUPPORT = 1 shl 24;
// TODO: to check the value of this
TORO_MAX_READAHEAD_SIZE = 1048576;
TORO_UNIQUE = $2721987;
ROOT_UID = 0;
var
FSVirtIO: TVirtIOFSDevice;
function VirtioFSLookUpInode(Ino: PInode; Name: PXChar): PInode; forward;
function VirtIOGetDeviceFeatures(Dev: PVirtIOPciCommonCfg): DWORD;
begin
Result := Dev.DeviceFeature;
end;
// Reset device and negotiate features
function VirtIONegociateFeatures(Dev: PVirtIOPciCommonCfg; Features: DWORD): Boolean;
var
devfeat: DWORD;
begin
Result := False;
Dev.DeviceStatus := 0;
Dev.DeviceStatus := VIRTIO_ACKNOWLEDGE;
Dev.DeviceStatus := VIRTIO_ACKNOWLEDGE or VIRTIO_DRIVER;
devfeat := Dev.DeviceFeature;
devfeat := devfeat and Features;
// TODO: To check if this is the right field
Dev.DeviceFeature_select := devfeat;
Dev.DeviceStatus := VIRTIO_ACKNOWLEDGE or VIRTIO_DRIVER or VIRTIO_FEATURES_OK;
if ((Dev.DeviceStatus and VIRTIO_FEATURES_OK) = 0) then
Exit;
Result := True;
end;
function VirtIOInitQueue(Dev: PVirtIOPciCommonCfg; QueueId: Word; Queue: PVirtQueue; HeaderLen: DWORD): Boolean;
var
sizeOfBuffers: DWORD;
sizeofQueueAvailable: DWORD;
sizeofQueueUsed: DWORD;
buff: PChar;
begin
Result := False;
FillByte(Queue^, sizeof(TVirtQueue), 0);
Dev.QueueSelect := QueueId;
Queue.QueueSize := Dev.QueueSize;
sizeOfBuffers := (sizeof(TQueueBuffer) * Queue.QueueSize);
sizeofQueueAvailable := (2*sizeof(WORD)+2) + (Queue.QueueSize*sizeof(WORD));
sizeofQueueUsed := (2*sizeof(WORD)+2)+(Queue.QueueSize*sizeof(VirtIOUsedItem));
// buff must be 4k aligned
buff := ToroGetMem(sizeOfBuffers + sizeofQueueAvailable + sizeofQueueUsed + 4096 * 2);
FillByte(buff^, sizeOfBuffers + sizeofQueueAvailable + sizeofQueueUsed + 4096 * 2, 0);
buff := buff + (4096 - PtrUInt(buff) mod 4096);
// 16 bytes aligned
Queue.buffers := PQueueBuffer(buff);
// 2 bytes aligned
Queue.available := @buff[sizeOfBuffers];
// 4 bytes aligned
Queue.used := PVirtIOUsed(@buff[((sizeOfBuffers + sizeofQueueAvailable+$0FFF) and not $FFF)]);
Queue.NextBuffer:= 0;
Queue.lock := 0;
Dev.QueueDesc := QWORD(Queue.buffers);
Dev.QueueAvail := QWORD(Queue.available);
Dev.QueueUsed := QWORD(Queue.used);
Dev.QueueEnable := 1;
Dev.DeviceStatus := VIRTIO_ACKNOWLEDGE or VIRTIO_DRIVER or VIRTIO_FEATURES_OK or VIRTIO_DRIVER_OK;
if ((Dev.DeviceStatus and DEVICE_NEEDS_RESET) = DEVICE_NEEDS_RESET) then
Exit;
if HeaderLen <> 0 then
begin
Queue.Buffer := ToroGetMem(queue.QueueSize * (HeaderLen) + 4096);
Queue.Buffer := Pointer(PtrUint(queue.Buffer) + (4096 - PtrUInt(queue.Buffer) mod 4096));
Queue.ChunkSize := HeaderLen;
end;
Result := True;
end;
procedure VirtIOSendBuffer(vq: PVirtQueue; BufferInfo:PBufferInfo; count: QWord; QueueIdx: WORD);
var
index, buffer_index, NextBuffer_index: word;
b: PBufferInfo;
i: LongInt;
QueueBuffer: PQueueBuffer;
begin
index := vq.available.index mod vq.QueueSize;
buffer_index := vq.NextBuffer;
vq.available.rings[index] := buffer_index;
for i := 0 to (count-1) do
begin
NextBuffer_index:= (buffer_index +1) mod vq.QueueSize;
b := Pointer(PtrUInt(BufferInfo) + i * sizeof(TBufferInfo));
QueueBuffer := Pointer(PtrUInt(vq.buffers) + buffer_index * sizeof(TQueueBuffer));
QueueBuffer.flags := b.flags;
QueueBuffer.next := NextBuffer_index;
QueueBuffer.length := b.size;
if (i <> (count-1)) then
QueueBuffer.flags := QueueBuffer.flags or VIRTIO_DESC_FLAG_NEXT;
QueueBuffer.address:= PtrUInt(b.buffer);
buffer_index := NextBuffer_index;
end;
ReadWriteBarrier;
vq.NextBuffer := buffer_index;
Inc(vq.available.index);
if (vq.used.flags and 1 <> 1) then
FsVirtio.QueueNotify^ := QueueIdx;
end;
procedure virtIOFSDedicate(Driver:PBlockDriver; CPUID: LongInt);
begin
DedicateBlockFile(@FsVirtIO.FileDesc, CPUID);
end;
procedure VirtioFSWriteInode(Ino: PInode);
begin
WriteConsoleF('VirtioFSWriteInode: This is not implemented yet\n', []);
end;
function VirtioFSCloseFile(FileDesc: PFileRegular): LongInt;
var
OutHeader: TFuseOutHeader;
InHeader: TFuseInHeader;
ReleaseIn: TFuseReleaseIn;
BufferInfo: array[0..2] of TBufferInfo;
Done: Boolean;
begin
Result := 0;
InHeader.opcode := FUSE_RELEASE;
InHeader.len := sizeof(InHeader) + sizeof(ReleaseIn);
Done := False;
InHeader.unique := PtrUInt(@Done);
InHeader.nodeid := FileDesc.INode.ino;
InHeader.uid := ROOT_UID;
ReleaseIn.fh := FileDesc.Opaque;
BufferInfo[0].buffer := @InHeader;
BufferInfo[0].size := sizeof(InHeader);
BufferInfo[0].flags := 0;
BufferInfo[1].buffer := @ReleaseIn;
BufferInfo[1].size := sizeof(ReleaseIn);
BufferInfo[1].flags := 0;
BufferInfo[2].buffer := @OutHeader;
BufferInfo[2].size := sizeof(OutHeader);
BufferInfo[2].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
VirtIOSendBuffer(@FsVirtio.RqQueue, @BufferInfo[0], 3, REQUEST_QUEUE);
while not Done do
ReadWriteBarrier;
if OutHeader.error <> 0 then
Exit;
Result := 1;
end;
function VirtioFSOpenFile(FileDesc: PFileRegular; Flags: Longint): LongInt;
var
OutHeader: TFuseOutHeader;
InHeader: TFuseInHeader;
OpenIn: TFuseOpenIn;
OpenOut: TFuseOpenOut;
BufferInfo: array[0..3] of TBufferInfo;
Done: Boolean;
begin
Result := 0;
InHeader.opcode := FUSE_OPEN;
InHeader.len := sizeof(InHeader) + sizeof(OpenIn);
InHeader.nodeid := FileDesc.Inode.ino;
Done := False;
InHeader.unique := PtrUInt(@Done);
InHeader.uid := ROOT_UID;
OpenIn.flags := Flags;
BufferInfo[0].buffer := @InHeader;
BufferInfo[0].size := sizeof(InHeader);
BufferInfo[0].flags := 0;
BufferInfo[1].buffer := @OpenIn;
BufferInfo[1].size := sizeof(OpenIn);
BufferInfo[1].flags := 0;
BufferInfo[2].buffer := @OutHeader;
BufferInfo[2].size := sizeof(OutHeader);
BufferInfo[2].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
BufferInfo[3].buffer := @OpenOut;
BufferInfo[3].size := sizeof(OpenOut);
BufferInfo[3].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
VirtIOSendBuffer(@FsVirtio.RqQueue, @BufferInfo[0], 4, REQUEST_QUEUE);
while not Done do
ReadWriteBarrier;
if OutHeader.error <> 0 then
Exit;
FileDesc.Opaque := openout.fh;
Result := 1;
end;
// TODO: These values should be parameters
const
Irusr = &400;
Iwusr = &200;
Irgrp = &40;
Iroth = &4;
S_Ifreg = $8000;
function VirtIOFSCreateInode(Ino: PInode; Name: PXChar): PInode;
var
Len: LongInt;
MknodIn: TFuseMknodIn;
BufferInfo: array[0..3] of TBufferInfo;
InHeader: TFuseInHeader;
OutHeader: TFuseOutHeader;
Done : Boolean;
begin
Result := nil;
Len := strlen(name) + 1;
InHeader.opcode := FUSE_MKNOD;
Done := False;
InHeader.unique := PtrUInt(@Done);
InHeader.len := sizeof(InHeader) + sizeof(MknodIn) + Len ;
InHeader.nodeid := Ino.ino;
InHeader.uid := ROOT_UID;
OutHeader.error := 0;
// TODO: Mode must be a parameter
MknodIn.mode := S_Ifreg or Irusr or Iwusr or Irgrp or Iroth;
MknodIn.rdev := 0;
MknodIn.umask := 0;
BufferInfo[0].buffer := @InHeader;
BufferInfo[0].size := sizeof(InHeader);
BufferInfo[0].flags := 0;
BufferInfo[1].buffer := @MknodIn;
BufferInfo[1].size := sizeof(MknodIn);
BufferInfo[1].flags := 0;
BufferInfo[2].buffer := Pointer(Name);
BufferInfo[2].size := Len;
BufferInfo[2].flags := 0;
BufferInfo[3].buffer := @OutHeader;
BufferInfo[3].size := sizeof(OutHeader);
BufferInfo[3].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
VirtIOSendBuffer(@FsVirtio.RqQueue, @BufferInfo[0], 4, REQUEST_QUEUE);
while not Done do
ReadWriteBarrier;
if OutHeader.error <> 0 then
Exit;
Result := VirtioFSLookUpInode(Ino, Name);
end;
function VirtIOFSWriteFile(FileDesc: PFileRegular; Count: Longint; Buffer: Pointer): longint;
var
BufferInfo: array[0..4] of TBufferInfo;
WriteIn: TFuseWriteIn;
WriteOut: TFuseWriteOut;
InHeader: TFuseInHeader;
OutHeader: TFuseOutHeader;
Done: Boolean;
begin
Result := 0;
InHeader.opcode := FUSE_WRITE;
InHeader.len := sizeof(InHeader) + sizeof(WriteIn) + sizeof(Pointer);
Done := False;
InHeader.unique := PtrUInt(@Done);
InHeader.nodeid := FileDesc.Inode.ino;
InHeader.uid := ROOT_UID;
WriteIn.fh := FileDesc.Opaque;
WriteIn.size := Count;
WriteIn.offset := FileDesc.FilePos;
BufferInfo[0].buffer := @InHeader;
BufferInfo[0].size := sizeof(InHeader);
BufferInfo[0].flags := 0;
BufferInfo[1].buffer := @WriteIn;
BufferInfo[1].size := sizeof(WriteIn);
BufferInfo[1].flags := 0;
BufferInfo[2].buffer := Pointer(buffer);
BufferInfo[2].size := Count;
BufferInfo[2].flags := 0;
BufferInfo[3].buffer := @OutHeader;
BufferInfo[3].size := sizeof(OutHeader);
BufferInfo[3].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
BufferInfo[4].buffer := @WriteOut;
BufferInfo[4].size := sizeof(WriteOut);
BufferInfo[4].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
VirtIOSendBuffer(@FsVirtio.RqQueue, @BufferInfo[0], 5, REQUEST_QUEUE);
while not Done do
ReadWriteBarrier;
if OutHeader.error <> 0 then
Exit;
Inc(FileDesc.FilePos, Count);
// update inode size
if FileDesc.FilePos > FileDesc.Inode.Size then
FileDesc.Inode.Size := FileDesc.FilePos;
Result := Count;
end;
function VirtioFSReadFile(FileDesc: PFileRegular; Count: Longint; Buffer: Pointer): longint;
var
BufferInfo: array[0..3] of TBufferInfo;
ReadIn: TFuseReadIn;
InHeader: TFuseInHeader;
OutHeader: TFuseOutHeader;
Done: Boolean;
begin
Result := 0;
if FileDesc.FilePos + Count > FileDesc.Inode.Size then
begin
Count := FileDesc.Inode.Size - FileDesc.FilePos;
If Count = 0 then
Exit;
end;
InHeader.opcode := FUSE_READ;
InHeader.len := sizeof(InHeader) + sizeof(ReadIn);
Done := False;
InHeader.unique := PtrUInt(@Done);
InHeader.nodeid := FileDesc.Inode.ino;
InHeader.uid := ROOT_UID;
ReadIn.fh := FileDesc.Opaque;
ReadIn.size := Count;
ReadIn.offset := FileDesc.FilePos;
BufferInfo[0].buffer := @InHeader;
BufferInfo[0].size := sizeof(InHeader);
BufferInfo[0].flags := 0;
BufferInfo[1].buffer := @ReadIn;
BufferInfo[1].size := sizeof(ReadIn);
BufferInfo[1].flags := 0;
BufferInfo[2].buffer := @OutHeader;
BufferInfo[2].size := sizeof(OutHeader);
BufferInfo[2].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
BufferInfo[3].buffer := Pointer(buffer);
BufferInfo[3].size := Count;
BufferInfo[3].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
VirtIOSendBuffer(@FsVirtio.RqQueue, @BufferInfo[0], 4, REQUEST_QUEUE);
while not Done do
ReadWriteBarrier;
if OutHeader.error <> 0 then
Exit;
Inc(FileDesc.FilePos, Count);
Result := Count;
end;
function VirtioFSLookUpInode(Ino: PInode; Name: PXChar): PInode;
var
len: LongInt;
EntryOut: TFuseEntryOut;
BufferInfo: array[0..3] of TBufferInfo;
InHeader: TFuseInHeader;
OutHeader: TFuseOutHeader;
Done : Boolean;
begin
Result := nil;
Len := strlen(name) + 1;
InHeader.opcode := FUSE_LOOKUP;
Done := False;
InHeader.unique := PtrUInt(@Done);
InHeader.len := sizeof(InHeader) + Len ;
InHeader.nodeid := Ino.ino;
InHeader.uid := ROOT_UID;
BufferInfo[0].buffer := @InHeader;
BufferInfo[0].size := sizeof(InHeader);
BufferInfo[0].flags := 0;
BufferInfo[1].buffer := Pointer(Name);
BufferInfo[1].size := Len;
BufferInfo[1].flags := 0;
BufferInfo[2].buffer := @OutHeader;
BufferInfo[2].size := sizeof(OutHeader);
BufferInfo[2].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
BufferInfo[3].buffer := @EntryOut;
BufferInfo[3].size := sizeof(EntryOut);
BufferInfo[3].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
VirtIOSendBuffer(@FsVirtio.RqQueue, @BufferInfo[0], 4, REQUEST_QUEUE);
while not Done do
ReadWriteBarrier;
if OutHeader.error <> 0 then
Exit;
Result := GetInode(EntryOut.nodeid);
end;
procedure VirtioFSReadInode(Ino: PInode);
var
BufferInfo: array[0..3] of TBufferInfo;
InHeader: TFuseInHeader;
OutHeader: TFuseOutHeader;
GetAttrIn: TFuseGetAttrIn;
GetAttrOut: TFuseGetAttrOut;
Done: Boolean;
begin
InHeader.opcode := FUSE_GETATTR;
InHeader.len := sizeof(InHeader) + sizeof(GetAttrIn);
InHeader.nodeid := Ino.ino;
InHeader.uid := ROOT_UID;
Done := False;
InHeader.unique := PtrUInt(@Done);
BufferInfo[0].buffer := @InHeader;
BufferInfo[0].size := sizeof(InHeader);
BufferInfo[0].flags := 0;
BufferInfo[1].buffer := @GetAttrIn;
BufferInfo[1].size := sizeof(GetAttrIn);
BufferInfo[1].flags := 0;
BufferInfo[2].buffer := @OutHeader;
BufferInfo[2].size := sizeof(OutHeader);
BufferInfo[2].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
BufferInfo[3].buffer := @GetAttrOut;
BufferInfo[3].size := sizeof(GetAttrOut);
BufferInfo[3].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
VirtIOSendBuffer(@FsVirtio.RqQueue, @BufferInfo[0], 4, REQUEST_QUEUE);
while not Done do
ReadWriteBarrier;
If OutHeader.error <> 0 then
Exit;
Ino.Size := GetAttrOut.attr.size;
Ino.Dirty := False;
if GetAttrOut.attr.mode and $4000 = $4000 then
Ino.Mode := INODE_DIR
else
Ino.Mode := INODE_REG;
end;
function VirtioFSReadSuper(Super: PSuperBlock): PSuperBlock;
var
BufferInfo: array[0..3] of TBufferInfo;
InHeader: TFuseInHeader;
OutHeader: TFuseOutHeader;
InitIn: TFuseInitIn;
InitOut: TFuseInitOut;
Done: Boolean;
begin
Result := nil;
InHeader.opcode := FUSE_INIT;
InHeader.len := sizeof(InHeader) + sizeof(InitIn);
InHeader.uid := ROOT_UID;
Done := False;
InHeader.unique := PtrUInt(@Done);
InitIn.major := FUSE_MAJOR_VERSION;
InitIn.minor := FUSE_MINOR_VERSION;
// TODO: to check this flags
InitIn.flags := 0;
InitIn.MaxReadahead := TORO_MAX_READAHEAD_SIZE;
BufferInfo[0].buffer := @InHeader;
BufferInfo[0].size := sizeof(InHeader);
BufferInfo[0].flags := 0;
BufferInfo[1].buffer := @InitIn;
BufferInfo[1].size := sizeof(InitIn);
BufferInfo[1].flags := 0;
BufferInfo[2].buffer := @OutHeader;
BufferInfo[2].size := sizeof(OutHeader);
BufferInfo[2].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
BufferInfo[3].buffer := @InitOut;
BufferInfo[3].size := sizeof(InitOut);
BufferInfo[3].flags := VIRTIO_DESC_FLAG_WRITE_ONLY;
VirtIOSendBuffer(@FsVirtio.RqQueue, @BufferInfo[0], 4, REQUEST_QUEUE);
while not Done do
ReadWriteBarrier;
if OutHeader.error <> 0 then
Exit;
Super.InodeROOT := GetInode(FUSE_ROOT_ID);
If Super.InodeROOT = nil then
Exit;
Result := Super;
end;
procedure VirtIOProcessQueue(vq: PVirtQueue);
var
index, norm_index, buffer_index: Word;
QueueBuffer: PQueueBuffer;
InHeader: ^TFuseInHeader;
p: ^Boolean;
begin
if vq.LastUsedIndex = vq.used.index then
Exit;
index := vq.LastUsedIndex;
while index <> vq.used.index do
begin
norm_index := index mod vq.QueueSize;
buffer_index := vq.used.rings[norm_index].index;
QueueBuffer := Pointer(PtrUInt(vq.buffers) + buffer_index * sizeof(TQueueBuffer));
InHeader := Pointer(QueueBuffer.address);
p := Pointer(InHeader.unique);
Panic(p^ = True, 'VirtioFS: Waking up a thread in ready state\n', []);
p^ := True;
inc(index);
end;
vq.LastUsedIndex := index;
ReadWriteBarrier;
end;
procedure VirtIOFSHandler;
var
r: DWORD;
begin
r := FsVirtio.IsrConfig^;
if (r and 1 = 1) then
VirtIOProcessQueue (@FsVirtio.RqQueue);
eoi;
end;
procedure VirtIOFSIrqHandler; {$IFDEF FPC} [nostackframe]; assembler; {$ENDIF}
asm
{$IFDEF DCC} .noframe {$ENDIF}
// save registers
push rbp
push rax
push rbx
push rcx
push rdx
push rdi
push rsi
push r8
push r9
push r10
push r11
push r12
push r13
push r14
push r15
mov r15 , rsp
mov rbp , r15
sub r15 , 32
mov rsp , r15
xor rcx , rcx
Call VirtIOFSHandler
mov rsp , rbp
pop r15
pop r14
pop r13
pop r12
pop r11
pop r10
pop r9
pop r8
pop rsi
pop rdi
pop rdx
pop rcx
pop rbx
pop rax
pop rbp
db $48
db $cf
end;
procedure FindVirtIOFSonPci;
var
PciDev: PBusDevInfo;
off, multi: DWORD;
cap_vndr, cap: Byte;
cfg, Bar, next: Byte;
begin
PciDev := PCIDevices;
while PciDev <> nil do
begin
if (PciDev.vendor = $1AF4) and (PciDev.device >= $1040) and (PciDev.device <= $107F) then
begin
// this is a modern virtio driver
if PciDev.device = VIRTIO_ID_FS then
begin
FsVirtio.IRQ := PciDev.IRQ;
multi := 0;
Cap := PciGetNextCapability(PciDev, 0);
while Cap <> 0 do
begin
cap_vndr := PciReadByte(PciDev.bus, PciDev.dev, PciDev.func, Cap);
cfg := PciReadByte(PciDev.bus, PciDev.dev, PciDev.func, Cap + 3);
bar := PciReadByte(PciDev.bus, PciDev.dev, PciDev.func, Cap + 4);
off := PciReadDword(PciDev.bus, PciDev.dev, PciDev.func, (Cap div 4) + 2);
next := PciGetNextCapability(PciDev, Cap);
multi := PciReadDword(PciDev.bus, PciDev.dev, PciDev.func, (Cap div 4) + 4);
Cap := next;
if cap_vndr <> PCI_CAP_ID_VNDR then
continue;
if cfg = VIRTIO_PCI_CAP_NOTIFY_CFG then
begin
if IsPCI64Bar(PciDev.IO[bar]) then
FsVirtio.QueueNotify := Pointer((PciDev.IO[bar] and $FFFFFFF0) + ((PciDev.IO[bar+1] and $FFFFFFFF) * (1 shl 32)) + off)
else
FsVirtio.QueueNotify := Pointer((PciDev.IO[bar] and $FFFFFFF0) + off);
FsVirtio.NotifyOffMultiplier := multi;
end;
if cfg = VIRTIO_PCI_CAP_DEVICE_CFG then
begin
if IsPCI64Bar(PciDev.IO[bar]) then
FsVirtio.FsConfig := Pointer((PciDev.IO[bar] and $FFFFFFF0) + ((PciDev.IO[bar+1] and $FFFFFFFF) * (1 shl 32)) + off)
else
FsVirtio.FsConfig := Pointer((PciDev.IO[bar] and $FFFFFFF0) + off);
WriteConsoleF('VirtIOFS: Detected device tagged: %p, queues: %d\n', [PtrUInt(@FsVirtio.FsConfig.tag), FsVirtio.FsConfig.numQueues]);
end;
if cfg = VIRTIO_PCI_CAP_COMMON_CFG then
begin
if IsPCI64Bar(PciDev.IO[bar]) then
FsVirtio.CommonConfig := Pointer((PciDev.IO[bar] and $FFFFFFF0) + ((PciDev.IO[bar+1] and $FFFFFFFF) * (1 shl 32)) + off)
else