getting ready

.gitignore

@@ -1,13 +1,12 @@
-/lib/*.ppu
-/lib/*.a
-/lib/*.o
-/release/*.svg
-/release/*.iso
-/bin/*.bin
-/iso/boot/asuro.bin
-/*.iso
-/*.md5
-/*.sh~
+*.o
+*.ppu
+*.s
+*.iso
+*.elf
+lib/
+release/
+doc/
+bin/
 /*.img
 src/include/asuro.pas
 localenv.json

checksums.md5

@@ -0,0 +1,135 @@
+
+c1e267c6b88cab4d1e3c86fa7f2f8ab1  src//contextswitcher.pas
+0be0d543ea50325c0dee1693c5854c48  src//cpu.pas
+ac76654ddebbeb1d3cc16ca4c85e77ff  src//drivermanagement.pas
+693ca299a852a25d3d8820bb0d76dfeb  src//faults.pas
+eff5f36e129bc22770d643173c426cbd  src//gdt.pas
+42d014445ddc0fd4d01c59e690795532  src//idt.pas
+b40f0c2f3ec166a0bf2ebcf8f11f5614  src//irq.pas
+160ca7f01eb779595a5c90174f8d545e  src//isr.pas
+03963c1b5cf5f661df5598de9af51458  src//kernel.pas
+71a3e1a6c21a76ff71e06e0743c0c57f  src//lmemorymanager.pas
+8e6a6f36c53ecd90e4669189aa9312b4  src//pmemorymanager.pas
+4a5f5bf0f2ca7fff89074ad02813091c  src//processloader.pas
+e600e339593a8bb35964e7531c074e7b  src//progmanager.pas
+81d4b5c4a25a1a855d75a88c725b77fe  src//scheduler.pas
+1be263e53e4838f6a06d2ece86400ef2  src//stdio.pas
+940a7ed5808841c6ba344b67965ecba7  src//syslog.pas
+fe1dba288d3a3ab427a9dea0a9f747ae  src//tracer.pas
+4598f9b19f3e3748394b6f1cb8e52043  src//tss.pas
+1a0461e1028921131594edae0a01e608  src//vmemorymanager.pas
+44b09f7af29af7d7fb9711ee0ea5968d  src/driver/bus/PCI.pas
+6e970ae957a3fbc600c8ee6b42634c78  src/driver/bus/usb/EHCI.pas
+181e6c09e33ff59b3eb827085591d19f  src/driver/bus/usb/OHCI.pas
+820defeb214b59d2329881670cbb493f  src/driver/bus/usb/UHCI.pas
+6edd4a1e9c92e092aea1368d9aa2724f  src/driver/bus/usb/USB.pas
+8588f4da48c37646c969b7d51aa28676  src/driver/bus/usb/XHCI.pas
+e064e466ca4a89b2c88df80f75ab0bdc  src/driver/bus/usb/usbcore.pas
+e8aabf9e1ba0c09ede43ed2844802aa0  src/driver/bus/usb/usbhub.pas
+631d06f67ee6af6bfdcec3279967bca0  src/driver/bus/usb/usbtypes.pas
+45f1afa1170ab00ec92e52de18f1de19  src/driver/exp/testdriver.pas
+28e9e1ff635893639c4442656b763d4b  src/driver/hid/keyboard.pas
+25a86d7379eae581d6c69ccbcfb9d722  src/driver/hid/mouse.pas
+84ceeacce04bc9659c73cba838c94cca  src/driver/hid/ps2/ps2_keyboard.pas
+16a706312825c01b6dd13f51aa385c5f  src/driver/hid/ps2/ps2_keyboard_isr.pas
+d272f2bd62399a119e93118a81a74833  src/driver/hid/ps2/ps2_mouse.pas
+57615a202dd2cf26c64601d86bd5e36c  src/driver/hid/usb/usb_keyboard.pas
+da94fe43ff22d2050ccd8eec602aa4b5  src/driver/hid/usb/usb_mouse.pas
+3f6f56b05d141194fa1e48d46d441042  src/driver/include/drivertypes.pas
+8a6f0bf9d2c77d32f2ce5dede4e15d9a  src/driver/interface/serial.pas
+2d3bcfceef94d7e1138ca465bb32aea5  src/driver/net/include/nettypes.pas
+63a3fa928b17ffd31c9ea033f3443b41  src/driver/net/include/netutils.pas
+9aca959358eaa2159421434a4d1855df  src/driver/net/l1/net.pas
+033c08a36b2e99d573e09f1e182937e0  src/driver/net/l2/eth2.pas
+418cdb2657980f11172bb0c70ff4326d  src/driver/net/l3/arp.pas
+e71bc0e877d736be29378ecdfb91c615  src/driver/net/l3/ipv4.pas
+38facb711f1153b80011e1adee8cfba5  src/driver/net/l4/icmp.pas
+fd577fe3e13389f4ffddfe7480935ae1  src/driver/net/l4/tcp.pas
+0cda1d5d8c298b577b49cc8f1ae031bf  src/driver/net/l4/udp.pas
+004a93b3d4cc1efe1172564239eaf795  src/driver/net/l5/dhcp.pas
+1cf47de6c18308e1d140ce47e74bb204  src/driver/netdev/E1000.pas
+bd529497b38ce6bc7697a6dcde6f7fd7  src/driver/storage/MBR.pas
+333c3bb46b3ca14746281b4921a25630  src/driver/storage/iobuffer.pas
+08a8280503120f3a90a9a041bc8b67d3  src/driver/storage/partitiontable.pas
+2bc09f8f54dd10717440b74017bdeb3d  src/driver/storage/storagemanager.pas
+91d10f7ef29d62e633968d72ceeea2b1  src/driver/storage/storagetypes.pas
+76e01e83220c1882dc429129c0ad937b  src/driver/storage/usb_storage.pas
+e42fdff36185dd92498378ab470a4b35  src/driver/storage/vfs.pas
+621d834536a649b3b483016060bbfafc  src/driver/storage/volumemanager.pas
+0e300d4c833bab776e8d91a348a5b60c  src/driver/storage/AHCI/AHCI.pas
+16304358a6278c23a751e31bb464eae5  src/driver/storage/AHCI/AHCITypes.pas
+b5e3bcb914b585a95ac646cfea7d016e  src/driver/storage/Filesystems/asfs.pas
+cb23855b8bad502999656d3121882c74  src/driver/storage/Filesystems/fat32.pas
+9bceba956d3eeffe97e07bdd45a9476f  src/driver/storage/Filesystems/filesystemmanager.pas
+e03d028cc2915c3cb0a8245407c99b7b  src/driver/storage/Filesystems/flatfs.pas
+5bd48e9a8c97ea11edc2789d2ec7902a  src/driver/storage/Filesystems/iso9660.pas
+753c6bbb3c5f84cdd7300330456980d7  src/driver/storage/IDE/IDE.pas
+f5e13673000388c7b8fa980824139163  src/driver/storage/IDE/ata.pas
+5760feea5b9a4ce3fad820b542113c56  src/driver/storage/IDE/atapi.pas
+900eb584e797111c1a54ca86542e71d0  src/driver/storage/IDE/idetypes.pas
+6d9508503dca0543fe932c32ef8267fc  src/driver/timers/RTC.pas
+c025ffabb5bba2272578d04903637d11  src/driver/timers/TMR_0_ISR.pas
+4a7434e5567f738b8545d56558902d9f  src/driver/timers/TMR_1_ISR.pas
+a4459a13e30281d020d0a8730e243b02  src/driver/timers/graphicsrefresh.pas
+4503465b3f62464f25e17e1d1a67e54d  src/driver/timers/usbhotplug.pas
+0434cc7b77429f971d372e89a8a6972d  src/driver/video/desktop.pas
+fef57dc0269caad191652df07da04466  src/driver/video/doublebuffer.pas
+a2c0d973e133f2624599d12fc0ec13f6  src/driver/video/lvgl.pas
+dce8755865885e41c08b062c162b06c9  src/driver/video/uidebug.pas
+20dc95321989d632fa4c39a5faf74733  src/driver/video/vesa.pas
+19c988cfcc36bcc78e73747662672d8f  src/driver/video/vesa16.pas
+f6714e6972770155cf2c72822ab76128  src/driver/video/vesa24.pas
+81e2f271055c2a89dfc8b7f1d19bf509  src/driver/video/vesa32.pas
+8ea870a31f4a9b11b3dcd639a65d9ca8  src/driver/video/vesa8.pas
+542aa1da8f8e9d6e5cb5e0b90a3c9de5  src/driver/video/video.pas
+d499b828752660e1a03272eb4f63eebb  src/driver/video/videotypes.pas
+b9f4c8f07d26c77cb49bd032202775c0  src/driver/video/windows.pas
+aadcb02abac658feec02042bf5ea4ad0  src/fault/ACE.pas
+d530d3094d335ce5ab78475de5b5a39a  src/fault/BPE.pas
+84c5c4e3981b9718403e7fdeb9ef9f7f  src/fault/BTSSE.pas
+01acde61a8f3f27592e9c6d15349348d  src/fault/CFE.pas
+0f5db45e5979949114dba7d9ba205103  src/fault/CSOE.pas
+a7565ac9d1dadc801c16758d2c4e84fe  src/fault/DBGE.pas
+c45fb023b19f7240a911e189c1771c41  src/fault/DBZ.pas
+b5453d37dd18e375a15f50a870c6dea2  src/fault/DFE.pas
+25fdec8dd1c72680acd5a6246ced55eb  src/fault/GPF.pas
+3c7671f86051aa727adcf547f175d338  src/fault/IDOE.pas
+710aadf1e601c74a0cd8563632f35c50  src/fault/IOPE.pas
+85d27bbbe7002ec3e5e73ff9e971844f  src/fault/MCE.pas
+3f81337468d131b0c9896a588f230772  src/fault/NCE.pas
+7548539c52222f081d75841b929d439f  src/fault/NMIE.pas
+f6a105e5873cc14a8a5c5b05298bdfd1  src/fault/OOBE.pas
+8f976f5663439e533347758cc79add39  src/fault/PF.pas
+3870beacc5b322fa63f633f14b1a8320  src/fault/SFE.pas
+522c6788021d8ebf966096311dd1f38d  src/fault/SNPE.pas
+f32ed5dffb58626b7657a24866c6af4e  src/fault/UIE.pas
+b6bfdc59f9962fc257e9adc7b57a3273  src/include/base64.pas
+dee8388dac0ca79ee6aef73469d75f6b  src/include/bios_data_area.pas
+717b8c0a42983f6b8864d5deda4dd532  src/include/color.pas
+1987f262a6053e02080023554d942ae1  src/include/crc.pas
+7f6c812b5d7ae1a8af5ef00d42a4eb1d  src/include/fonts.pas
+bf9fe2883789147e08980ab4c43220f7  src/include/hashmap.pas
+513d59ae08ba6d753a871e1a82b46ed4  src/include/lists.pas
+c5ef14ac60dad5a32ebfa43da153d05c  src/include/md5.pas
+124f12d75de7ade6993ccd2f02b53ad4  src/include/multiboot.pas
+d8beadde6ebb05c8a3e74aae57d61f34  src/include/rand.pas
+cfa50e59e4bd9ea3a5b05c6b1275858d  src/include/strings.pas
+cb254f95c5e09595c90db690bf98794f  src/include/system.pas
+5df11e0052010580d13f1a5ce3acd60f  src/include/targa.pas
+833967cf14697db6da421a4be58e9044  src/include/texture.pas
+635e5a8936a088a244ddfe48cd658a3f  src/include/types.pas
+a770014537fb6c8d70cf4bc3ec325500  src/include/util.pas
+e23b0bef333262860e1f68034331e529  src/isr/ioapic.pas
+63f4a330383220a5cfad0253c09afde3  src/isr/isr_types.pas
+851217f90e902ca65bebb017eeb172e7  src/isr/isrmanager.pas
+027f34dc6d4e67d15cf10d6db5edd514  src/prog/base64_prog.pas
+2e9d0c9db496dafc3c3423deee644c83  src/prog/dhclient.pas
+6c58870722f8b5fd86308123ae8c934b  src/prog/diskcmd.pas
+a0fa8cf89bee89802d506f2cd3a4dad7  src/prog/diskutil.pas
+31c7601131e09b0dfcc427cdb14bffb6  src/prog/edit.pas
+6fff6024194143a6ebbe849f9aff0326  src/prog/inio.pas
+1ff556cd50088e3ee3efa3103fdc6ba0  src/prog/md5sum.pas
+0f0e6dc1b2d1a6e14b2fd103826d1f12  src/prog/partcmd.pas
+0c7c7f62e8bf76fc2eec7f02e7a092b7  src/prog/vbeinfo.pas
+60bf159fa0a3efb34f73fa15a93acd7c  src/prog/volcmd.pas
+88d71b607256928831a33b363a44c006  src/prog/vterminal.pas

compile_sources.sh

@@ -4,4 +4,10 @@ echo "======================="
 echo " "
 echo "Compiling FPC Sources..."
 echo " "
-fpc -Aelf -gw -g -gl -n -v0ew -O3 -OpPENTIUM3 -Si -Sc -Sg -Xd -CX -XXs -CfSSE -CfSSE2 -Rintel -Pi386 -Tlinux -FElib/ -Fusrc/* -Fusrc/include/* -Fusrc/driver/* -Fusrc/driver/net/* -Fusrc/driver/bus/* -Fusrc/driver/bus/usb/* -Fusrc/driver/hid/* src/kernel.pas
+# Build -Fu flags for all directories under src/ and wasuro/
+FU_PATHS="-Fusrc -Fuwasuro"
+for dir in $(find src wasuro -type d 2>/dev/null); do
+    FU_PATHS="$FU_PATHS -Fu$dir"
+done
+
+fpc -Aelf -gw -g -gl -n -v0ew -O3 -OpPENTIUM3 -Si -Sc -Sg -Xd -CX -XXs -CfSSE -CfSSE2 -Rintel -Pi386 -Tlinux -FElib/ $FU_PATHS src/kernel.pas

doc/flatfs.md

@@ -0,0 +1,32 @@
+#Flat filesystem
+
+A super simple filesystem for asuro. Folders are emulated in filenames.
+
+Starts with disk info sector, sector 0 of volume
+
+---
+#### disk info
+
+jmp2boot        : ubit24;
+OEMName         : array[0..7] of char;
+version         : uint16 // numerical version of filesystem
+sectorCount      : uint16;
+fileCount       : uint16
+signature       : uint32 = 0x0B00B1E5
+
+
+the Rest of the sector is reserved
+
+---
+
+Starting from sector 1 is the file table. Table size is determined by entry size (64) * fileCount
+
+---
+####File entry
+
+name : array[0..59] of char //file name max 60 chars
+fileStart : 16bit // start sector of data
+fileSize : 16bit // data size in sectors
+
+---
+

iso/hello.txt

@@ -0,0 +1 @@
+Hello from the Asuro ISO!

src/driver/bus/PCI.pas

@@ -91,6 +91,7 @@ function getDeviceInfo(class_code : uint8; subclass_code : uint8; prog_if : uint
 procedure requestConfig(bus : uint8; slot : uint8; func : uint8; row : uint8);
 procedure writeConfig(bus: uint8; slot : uint8; func : uint8; row : uint8; val : uint32);
 procedure setBusMaster(bus : uint8; slot : uint8; func : uint8; master : boolean);
+procedure enableDevice(bus : uint8; slot : uint8; func : uint8);
 
 implementation 
 
@@ -442,4 +443,34 @@ begin
     pop_trace;
 end;
 
+//Enable device inturrupts and set bus master
+procedure enableDevice(bus : uint8; slot : uint8; func : uint8);
+var
+    addr : uint32;
+    cmd : uint32;
+begin
+    push_trace('PCI.enableDevice');
+
+    addr := ($1 shl 31);
+    addr := addr or (bus shl 16);
+    addr := addr or ((slot) shl 11);
+    addr := addr or ((func) shl 8);
+    addr := addr or ($04 and $FC);
+
+    outl(PCI_CONFIG_ADDRESS_PORT, addr);
+    cmd := inl(PCI_CONFIG_DATA_PORT);
+    cmd := cmd or PCI_COMMAND_MEM_SPACE;
+    cmd := cmd or PCI_COMMAND_BUS_MASTER;
+    cmd := cmd or (3 shl 1);
+
+    //enable interrupts, remove disable interrupt bit maybe
+    cmd := cmd and not PCI_COMMAND_INT_DISABLE;
+    // cmd := cmd and not (1 shl 9);
+
+    outl(PCI_CONFIG_ADDRESS_PORT, addr);
+    outl(PCI_CONFIG_DATA_PORT, cmd);
+
+    pop_trace;
+end;
+
 end.

src/driver/include/drivertypes.pas

@@ -21,6 +21,29 @@ unit drivertypes;
 
 interface
 
+const
+    PCI_CONFIG_ADDRESS_PORT = $0CF8;
+    PCI_CONFIG_DATA_PORT    = $0CFC;
+
+    PCI_COMMAND_IO_SPACE    = $0001;
+    PCI_COMMAND_MEM_SPACE   = $0002;
+    PCI_COMMAND_BUS_MASTER  = $0004;
+    PCI_COMMAND_SPECIAL_CYC = $0008;
+    PCI_COMMAND_MEM_WRITE   = $0010;
+    PCI_COMMAND_VGA_PALETTE = $0020;
+    PCI_COMMAND_PARITY      = $0040;
+    PCI_COMMAND_WAIT        = $0080;
+    PCI_COMMAND_SERR        = $0100;
+    PCI_COMMAND_FAST_BACK   = $0200;
+    PCI_COMMAND_INT_DISABLE = $0400;
+    PCI_COMMAND_SERR_ENABLE = $8000;
+
+    PCI_CAP_ID_MSI           = $05;
+
+    // Bits in the MSI Control register (16-bit):
+    MSI_CONTROL_ENABLE       = 1 shl 0;  // Bit 0
+    MSI_CONTROL_64BIT        = 1 shl 7;  // Bit 7
+    MSI_CONTROL_PVMASK       = 1 shl 8;  // Bit 8 (optional: per-vector masking)
 type
 
     PPCI_Device = ^TPCI_Device;
@@ -44,6 +67,7 @@ type
         address1       : uint32;
         address2       : uint32;
         address3       : uint32;
+
         address4       : uint32;
         address5       : uint32;
         CIS_pointer    : uint32;

src/driver/storage/AHCI/notes.md

@@ -0,0 +1,58 @@
+# AHCI Driver Notes
+
+## Pre-scheduling / Process Kill Hazards
+
+### 1. Dangling DMA Buffer (critical)
+When a process is killed, its `kalloc`'d buffers get freed. But the AHCI hardware
+is still DMA'ing into that physical memory. The DMA write lands on whatever now
+occupies that memory, silently corrupting the kernel heap or another process.
+
+**Fix:** Before freeing a process's memory, either:
+- Wait for all its pending AHCI slots to drain (`cmd_issue` bits clear), or
+- Issue a port reset to abort in-flight commands, *then* free memory.
+
+### 2. Dangling Completion Callback / Userdata Pointer (critical)
+In `storage_read`/`storage_write`, the completion callback writes to `@done` —
+a **stack-local variable**. If the scheduler preempts or kills the process while
+it's in the `hlt` loop, that stack frame is gone. The ISR fires and writes to a
+dangling stack address, corrupting whatever now uses that stack page.
+
+**Fix:** The `done` flag and completion context must be heap-allocated (or in a
+kernel-owned structure that outlives the process). A per-request struct like:
+```pascal
+type TPendingIO = record
+    done     : uint32;
+    ownerPID : uint32;  { skip delivery if process is dead }
+end;
+```
+
+### 3. Command Slot Leak
+If a process is killed with pending I/O, `pending[slot].inUse` stays `true`
+forever. Eventually all 32 slots fill up and the device becomes unusable.
+
+**Fix:** When killing a process, scan all AHCI devices for `pending[]` entries
+belonging to that process, and either:
+- Let the hardware finish but null out the completion callback (ISR just frees slot), or
+- Abort the command (port reset) and clear the slot.
+
+### 4. Interrupt-Disabled Preemption
+The `asm sti` before the `hlt` loop is fine, but if the timer fires during setup
+(between `readCallbackAsync(...)` and `asm sti`), the process could be switched
+out with interrupts in an unexpected state. `hlt` is also not preemption-safe.
+
+**Fix:** Move to a proper wait-queue/sleep mechanism instead of `hlt`.
+
+## Recommended Path Forward
+Implement a small **I/O request queue** owned by the kernel (not the process stack):
+1. Allocate a request struct
+2. Put it on a per-device queue
+3. ISR completes it
+4. Process kill walks the queue and cancels entries for that PID
+
+## Other Bugs Fixed (2026-03-03)
+- **vtop mask bug:** `$FFFFFF` (24-bit) → `$3FFFFF` (22-bit) for 4MB page offset
+- **find_cmd_slot:** Now checks `pending[].inUse` in addition to `cmd_issue` bit
+- **Missing lba5:** Both `send_read_dma_async` and `send_write_dma_async` now write all 48 LBA bits
+- **IOAPIC routing:** PCI interrupts routed through IOAPIC so AHCI interrupts actually reach the CPU
+- **LAPIC EOI:** `ISR_N` now sends LAPIC EOI for IOAPIC-delivered interrupts
+- **PxIS pre-clear removed:** No longer blanket-clears port interrupt status before issuing commands (was eating other slots' completions)

src/driver/storage/ATA_ISR.pas

@@ -1,85 +0,0 @@
-//  Copyright 2021 Aaron Hance
-//
-//  Licensed under the Apache License, Version 2.0 (the "License");
-//  you may not use this file except in compliance with the License.
-//  You may obtain a copy of the License at
-//
-//  http://www.apache.org/licenses/LICENSE-2.0
-//
-//  Unless required by applicable law or agreed to in writing, software
-//  distributed under the License is distributed on an "AS IS" BASIS,
-//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-//  See the License for the specific language governing permissions and
-//  limitations under the License.
-
-{ 
-	Drivers->Storage->ATA_ISR - Primary ATA IRQ.
-	
-	@author(Aaron Hance <[email protected]>)
-}
-unit ATA_ISR;
-
-interface
-
-uses
-    util,
-    syslog,
-    isr_types,
-    isrmanager,
-    IDT;
-
-procedure register();
-procedure hook(hook_method : uint32);
-procedure unhook(hook_method : uint32);
-
-implementation
-
-var
-    Hooks : Array[1..MAX_HOOKS] of pp_hook_method;
-
-procedure Main(); interrupt;
-var
-    i : integer;
-    
-begin
-    CLI;
-    for i:=0 to MAX_HOOKS-1 do begin
-        if uint32(Hooks[i]) <> 0 then Hooks[i](void($00000000));
-    end;
-    syslog.writestringln('Disk Operation Complete');
-end;
-
-procedure register();
-begin
-    memset(uint32(@Hooks[0]), 0, sizeof(pp_hook_method)*MAX_HOOKS);
-    //isrmanager.registerISR(76, @Main);
-    //IDT.set_gate(76, uint32(@Main), $08, ISR_RING_0);
-end;
-
-procedure hook(hook_method : uint32);
-var
-    i : uint32;
-
-begin
-    for i:=0 to MAX_HOOKS-1 do begin
-        if uint32(Hooks[i]) = hook_method then exit;
-    end;
-    for i:=0 to MAX_HOOKS-1 do begin
-        if uint32(Hooks[i]) = 0 then begin
-            Hooks[i]:= pp_hook_method(hook_method);
-            exit;
-        end;
-    end;
-end;
-
-procedure unhook(hook_method : uint32);
-var
-    i : uint32;
-begin
-    for i:=0 to MAX_HOOKS-1 do begin
-        If uint32(Hooks[i]) = hook_method then Hooks[i]:= nil;
-        exit;
-    end;
-end;
-
-end.

src/driver/storage/Filesystems/asfs.pas

@@ -22,14 +22,17 @@ unit asfs;
 interface
 
 uses
-    storagemanagement,
-    util,
-    lmemorymanager,
-    strings,
+    syslog,
     lists,
-    tracer,
+    lmemorymanager,
+    rtc,
     serial,
-    rtc;
+    storagemanagement,
+    storagemanager,
+    strings,
+    stdio,
+    tracer,
+    util;
 
 type
 
@@ -98,7 +101,7 @@ begin
     filesystemRecord^.endOfData       := filesystemRecord.sectorsPerTable; 
     //filesystemRecord.volumeLabel     := config^
 
-    disk^.writecallback(disk, start, 1, buffer);
+    storagemanager.storage_write(disk, start, 1, buffer);
     memset(uint32(buffer), 0, disk^.sectorSize);
 
     fileEntry            := PFileEntry(buffer)[0];
@@ -111,7 +114,7 @@ begin
     fileEntry^.attributes := 0;
     fileEntry^.location   := 1;
 
-    disk^.writecallback(disk, start + 1, 1, buffer);
+    storagemanager.storage_write(disk, start + 1, 1, buffer);
 
 
 end;

src/driver/storage/Filesystems/filesystemmanager.pas

@@ -0,0 +1,120 @@
+{
+    Driver->Storage->FilesystemManager - Filesystem driver registry and routing.
+
+    Filesystem drivers (FAT32, FlatFS, etc.) register themselves here.
+    When VolumeManager discovers a volume, FilesystemManager probes it
+    against all registered filesystem drivers to detect the filesystem type.
+
+    @author(Aaron Hance <[email protected]>)
+}
+unit filesystemmanager;
+
+interface
+
+uses
+    lists,
+    lmemorymanager,
+    storagetypes,
+    strings,
+    tracer,
+    util;
+
+var
+    filesystems : PLinkedListBase;
+
+procedure init();
+procedure register_filesystem(filesystem : PFilesystem);
+function get_filesystem_count() : uint32;
+function get_filesystem(index : uint32) : PFilesystem;
+function find_filesystem_by_name(name : pchar) : PFilesystem;
+function find_filesystem_by_id(system_id : uint8) : PFilesystem;
+procedure probe_volume(volume : PStorage_Volume);
+
+implementation
+
+procedure init();
+begin
+    push_trace('FilesystemManager.init');
+    filesystems := LL_New(sizeof(TFilesystem));
+end;
+
+procedure register_filesystem(filesystem : PFilesystem);
+var
+    elm : void;
+begin
+    push_trace('FilesystemManager.register_filesystem');
+
+    elm := LL_Add(filesystems);
+    memcpy(uint32(filesystem), uint32(elm), sizeof(TFilesystem));
+end;
+
+function get_filesystem_count() : uint32;
+begin
+    get_filesystem_count := LL_Size(filesystems);
+end;
+
+function get_filesystem(index : uint32) : PFilesystem;
+begin
+    if index < LL_Size(filesystems) then
+        get_filesystem := PFilesystem(LL_Get(filesystems, index))
+    else
+        get_filesystem := nil;
+end;
+
+function find_filesystem_by_name(name : pchar) : PFilesystem;
+var
+    i  : uint32;
+    fs : PFilesystem;
+begin
+    push_trace('FilesystemManager.find_filesystem_by_name');
+    find_filesystem_by_name := nil;
+
+    for i := 0 to LL_Size(filesystems) - 1 do begin
+        fs := PFilesystem(LL_Get(filesystems, i));
+        if stringEquals(fs^.sName, name) then begin
+            find_filesystem_by_name := fs;
+            exit;
+        end;
+    end;
+end;
+
+function find_filesystem_by_id(system_id : uint8) : PFilesystem;
+var
+    i  : uint32;
+    fs : PFilesystem;
+begin
+    push_trace('FilesystemManager.find_filesystem_by_id');
+    find_filesystem_by_id := nil;
+
+    for i := 0 to LL_Size(filesystems) - 1 do begin
+        fs := PFilesystem(LL_Get(filesystems, i));
+        if fs^.system_id = system_id then begin
+            find_filesystem_by_id := fs;
+            exit;
+        end;
+    end;
+end;
+
+procedure probe_volume(volume : PStorage_Volume);
+var
+    i  : uint32;
+    fs : PFilesystem;
+begin
+    push_trace('FilesystemManager.probe_volume.enter');
+
+    { Try each registered filesystem's identify callback against this volume }
+    for i := 0 to LL_Size(filesystems) - 1 do begin
+        fs := PFilesystem(LL_Get(filesystems, i));
+        if fs^.identifyCallback <> nil then begin
+            push_trace('FilesystemManager.probe_volume.tryFS');
+            if fs^.identifyCallback(volume) then begin
+                volume^.filesystem := fs;
+                push_trace('FilesystemManager.probe_volume.found');
+                exit;
+            end;
+        end;
+    end;
+    push_trace('FilesystemManager.probe_volume.exit');
+end;
+
+end.