Fix PS/2 mouse ISR blocking; convert USB polling & GFX refresh to processes; remove dead scheduler

PS/2 Mouse:
- Fix ISR spin-blocking by reading port $60 directly with inb() instead
  of calling mouse_read(), which uses mouse_wait_long (100k iterations)
  and would stall the interrupt handler waiting for the next packet byte.

Timer (PIT):
- Increase PIT frequency from ~1024 Hz to ~8 kHz (divisor 1193 -> 149)
  for more granular timer ticks.

Graphics Refresh:
- Replace timer-hook-driven rendering (driver/timers/graphicsrefresh)
  with a dedicated 'gfxd' process that runs a continuous render loop,
  keeping the vCPU active to avoid NEM/Hyper-V pause-loop descheduling.
- Move uidebug from driver/video/ to prog/.
- Update FPS calculation to account for 8 kHz tick rate.

USB Hotplug:
- Replace timer-hook-driven polling (driver/timers/usbhotplug) with a
  dedicated 'usbd' daemon process that sleeps 1s between poll cycles.
- Add bounds check in usbcore.usb_check_hotplug for empty HC list.

Cleanup:
- Remove old scheduler unit (superseded by processmanager/contextswitcher).
- Remove tss unit and tss.init() call from kernel.
- Remove unused syslog import from contextswitcher.
- Reduce BASE_QUANTUM from 8 to 5.

compile_lvgl.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 # compile_lvgl.sh — Download LVGL v9.2 source and compile into lib/liblvgl.a
 # Clone & compile in /tmp (fast container-local fs).
-# Copy source + objects to /lvgl (host mount) for debugging.
+# Cache liblvgl.a on host mount (/code/lvgl/) to skip rebuild.
 set -e
 
 LVGL_VERSION="v9.2.2"
@@ -10,6 +10,7 @@ LVGL_DIR="/tmp/lvgl"
 OBJ_DIR="/tmp/lvgl_obj"
 CONF_DIR="$(pwd)/lvglh"
 OUT_DIR="$(pwd)/lib"
+CACHE_DIR="/code/lvgl"
 
 CC="gcc"
 CFLAGS="-m32 -march=i686 -ffreestanding \
@@ -26,6 +27,17 @@ echo " "
 echo "Compiling LVGL..."
 echo " "
 
+# If cached liblvgl.a exists on host mount, just copy it and skip everything
+if [ -f "${CACHE_DIR}/liblvgl.a" ]; then
+    echo "Found cached liblvgl.a in ${CACHE_DIR}, copying to ${OUT_DIR}..."
+    cp "${CACHE_DIR}/liblvgl.a" "${OUT_DIR}/liblvgl.a"
+    echo "(Delete lvgl/liblvgl.a to force a full rebuild.)"
+    echo " "
+    echo "LVGL compilation complete (cached)."
+    echo " "
+    exit 0
+fi
+
 # Clone LVGL into /tmp (container-local)
 rm -rf "$LVGL_DIR"
 echo "Downloading LVGL ${LVGL_VERSION}..."
@@ -105,12 +117,14 @@ else
     echo "No custom LVGL files in lvglh/."
 fi
 
-# Copy source + objects to /lvgl host mount for debugging
-echo "Copying LVGL source and objects to host mount..."
-mkdir /code/lvgl 2>/dev/null || true
-rm -rf /code/lvgl/* /code/lvgl/.[!.]* /code/lvgl/..?* 2>/dev/null || true
-cp -a "$LVGL_DIR/src" /code/lvgl/src
-cp -a "$OBJ_DIR" /code/lvgl/obj
+# Cache liblvgl.a and source to host mount for next build
+echo "Caching LVGL to host mount..."
+mkdir -p "$CACHE_DIR"
+rm -rf ${CACHE_DIR}/* ${CACHE_DIR}/.[!.]* ${CACHE_DIR}/..?* 2>/dev/null || true
+cp "${OUT_DIR}/liblvgl.a" "${CACHE_DIR}/liblvgl.a"
+cp -a "$LVGL_DIR/src" "${CACHE_DIR}/src"
+cp -a "$LVGL_DIR"/*.h "${CACHE_DIR}/" 2>/dev/null || true
+cp -a "$OBJ_DIR" "${CACHE_DIR}/obj"
 echo "Done."
 
 echo " "

compile_sources.sh

@@ -4,4 +4,4 @@ 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/driver/* -Fusrc/driver/net/* -Fusrc/driver/bus/* -Fusrc/driver/bus/usb/* -Fusrc/driver/hid/* src/kernel.pas
+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

src/contextswitcher.pas

@@ -29,14 +29,11 @@ unit contextswitcher;
 interface
 
 uses
-    idt, isrmanager, processmanager, proctypes, util, syslog, tracer;
+    idt, isrmanager, processmanager, proctypes, util, tracer;
 
 { Initialise: overwrite IDT gate 32 with our custom ISR. }
 procedure init;
 
-{ No idle ESP variable needed — idle is now a formal process (PID 0)
-  with its SavedESP managed like any other process. }
-
 implementation
 
 { -----------------------------------------------------------------------

src/driver/bus/usb/usbcore.pas

@@ -957,11 +957,14 @@ end;
 procedure usb_check_hotplug;
 var
     i    : uint32;
+    count: uint32;
     hc   : PUSBHCDriver;
     port : uint8;
 begin
     if HCList = nil then exit;
-    for i := 0 to LL_Size(HCList) - 1 do begin
+    count := LL_Size(HCList);
+    if count = 0 then exit;
+    for i := 0 to count - 1 do begin
         hc := PUSBHCDriver(LL_Get(HCList, i));
         if (hc <> nil) and hc^.PortChangePending then begin
             hc^.PortChangePending := false;

src/driver/hid/ps2/ps2_mouse.pas

@@ -119,8 +119,12 @@ var
     x32, y32 : sint32;
     r : pchar;
 begin
+    { mouse_wait(0) checks OBF with a short timeout (100 iterations).
+      When it returns true, data is ready — read it directly with inb($60).
+      Do NOT call mouse_read here: it uses mouse_wait_long (100k iterations)
+      and would spin-block the ISR if the next packet byte hasn't arrived yet. }
     while mouse_wait(0) do begin
-        b := mouse_read;
+        b := inb($60);
         if Cycle = 0 then begin
             if (b AND $08) = $08 then begin
                 Mouse_Byte[Cycle] := b;

src/driver/timers/TMR_0_ISR.pas

@@ -13,7 +13,7 @@
 //  limitations under the License.
 
 { 
-	Driver->Timer->TMR_0_ISR - 1024hz Timer Driver.
+	Driver->Timer->TMR_0_ISR - 8khz Timer Driver.
 	
 	@author(Kieron Morris <[email protected]>)
 }
@@ -37,7 +37,7 @@ var
     Hooks : Array[1..MAX_HOOKS] of pp_hook_method;
     Registered : boolean = false;
 
-procedure Main; //IRQ0, 1024.19hz aprox
+procedure Main; //IRQ0, ~8001hz
 var
     i : integer;
 
@@ -54,7 +54,7 @@ procedure register();
 begin
     if not registered then begin
         asm
-            mov ax, 1193
+            mov ax, 149
             out $40, al
             mov al, ah
             out $40, al

src/driver/timers/graphicsrefresh.pas

@@ -1,54 +0,0 @@
-{
-    Driver->Timer->GraphicsRefresh - Timer-driven graphics refresh at ~120FPS.
-
-    Hooks into the 1024Hz timer (TMR_0_ISR) and calls the desktop, uidebug,
-    LVGL and video flush routines every ~9 ticks (1024/9 ≈ 113.8 FPS).
-
-    @author(Kieron Morris <[email protected]>)
-}
-unit graphicsrefresh;
-
-interface
-
-procedure init;
-
-implementation
-
-uses
-    util,
-    TMR_0_ISR,
-    desktop,
-    uidebug,
-    lvgl,
-    video,
-    windows,
-    syslog;
-
-const
-    { 1024 / 4 ≈ 256 FPS }
-    TICKS_PER_FRAME = 4;
-
-var
-    TickCounter : uint32;
-
-procedure on_tick(data : void);
-begin
-    TickCounter := TickCounter + 1;
-    if TickCounter >= TICKS_PER_FRAME then begin
-        TickCounter := 0;
-        windows.reapOrphanedWindows;
-        desktop.update;
-        uidebug.update;
-        lvgl_handler;
-        video.Flush;
-    end;
-end;
-
-procedure init;
-begin
-    TickCounter := 0;
-    TMR_0_ISR.hook(uint32(@on_tick));
-    syslog.logln('GFXREFRESH', 'Hooked into 1024Hz timer (~120 FPS).');
-end;
-
-end.

src/driver/timers/usbhotplug.pas

@@ -1,46 +0,0 @@
-{
-    Driver->Timer->USBHotplug - Timer-driven USB hotplug polling at ~1Hz.
-
-    Hooks into the 1024Hz timer (TMR_0_ISR) and calls
-    usbcore.usb_check_hotplug every 1024 ticks (approximately once per second).
-
-    @author(Kieron Morris <[email protected]>)
-}
-unit usbhotplug;
-
-interface
-
-procedure init;
-
-implementation
-
-uses
-    util,
-    TMR_0_ISR,
-    usbcore,
-    syslog;
-
-const
-    { 1024 ticks at 1024Hz ≈ 1 second }
-    TICKS_PER_POLL = 1024;
-
-var
-    TickCounter : uint32;
-
-procedure on_tick(data : void);
-begin
-    TickCounter := TickCounter + 1;
-    if TickCounter >= TICKS_PER_POLL then begin
-        TickCounter := 0;
-        usbcore.usb_check_hotplug;
-    end;
-end;
-
-procedure init;
-begin
-    TickCounter := 0;
-    TMR_0_ISR.hook(uint32(@on_tick));
-    syslog.logln('USBHOTPLUG', 'Hooked into 1024Hz timer (~1Hz polling).');
-end;
-
-end.

src/include/proctypes.pas

@@ -18,7 +18,7 @@ const
     PROCESS_STACK_SIZE = 8192;
 
     { Base quantum multiplier: quantum = Priority * BASE_QUANTUM ticks }
-    BASE_QUANTUM = 8;
+    BASE_QUANTUM = 5;
 
 type
     { Forward declaration }

src/kernel.pas

@@ -25,7 +25,7 @@ interface
 uses
      multiboot, bios_data_area,
      util,
-     gdt, idt, isr, irq, tss,
+     gdt, idt, isr, irq,
      TMR_0_ISR,
      syslog, stdio,
      keyboard, mouse,
@@ -33,7 +33,6 @@ uses
      vmemorymanager, pmemorymanager, lmemorymanager,
      tracer,
      drivermanagement,
-     scheduler,
      progmanager,
      processmanager, contextswitcher,
      testprocs,
@@ -67,34 +66,15 @@ uses
      base64,
      rand,
      hashmap, vfs,
-     video, vesa, doublebuffer, color, lvgl, desktop, uidebug,
+     video, vesa, doublebuffer, color, lvgl, desktop, uidebug, windows,
      vterminal,
-     graphicsrefresh, usbhotplug;
- 
-procedure terminal_command_meminfo(params : PParamList; stdin_buf, stdout_buf, stderr_buf : POutBuf);
-procedure terminal_command_bsod(params : PParamList; stdin_buf, stdout_buf, stderr_buf : POutBuf);
+     graphicsrefresh, usbhotplug,
+     fifo, cfifo, cfifols, lifo, circ, minh, maxh, prio;
  
 procedure kmain(mbinfo: Pmultiboot_info_t; mbmagic: uint32); stdcall;
  
 implementation
 
-procedure terminal_command_meminfo(params : PParamList; stdin_buf, stdout_buf, stderr_buf : POutBuf);
-begin
-    push_trace('kernel.terminal_command_meminfo');
-
-    stdio.bufWriteStr(stdout_buf, 'Lower Memory = ');
-    stdio.bufWriteInt(stdout_buf, multibootinfo^.mem_lower);
-    stdio.bufWriteStrLn(stdout_buf, 'KB');
-    stdio.bufWriteStr(stdout_buf, 'Higher Memory = ');
-    stdio.bufWriteInt(stdout_buf, multibootinfo^.mem_upper);
-    stdio.bufWriteStrLn(stdout_buf, 'KB');
-    stdio.bufWriteStr(stdout_buf, 'Total Memory = ');
-    stdio.bufWriteInt(stdout_buf, ((multibootinfo^.mem_upper + 1000) div 1024) + 1);
-    stdio.bufWriteStrLn(stdout_buf, 'MB');
-
-    pop_trace;
-end;
-
 procedure terminal_command_bsod(params : PParamList; stdin_buf, stdout_buf, stderr_buf : POutBuf);
 begin
     push_trace('kernel.terminal_command_bsod');
@@ -187,9 +167,7 @@ begin
 
      { Stdio Init }
      stdio.init();
-
-     tss.init();
-     scheduler.init();
+     stdio.registerCommand('BSOD', @terminal_command_bsod, 'Force a Panic Screen.');
 
      { CPUID }
      syslog.logln('CPU', 'Init begin');
@@ -277,6 +255,14 @@ begin
      usbhub.UnitTest;
      usb_keyboard.UnitTest;
      usb_mouse.UnitTest;
+     fifo.UnitTest;
+     cfifo.UnitTest;
+     cfifols.UnitTest;
+     lifo.UnitTest;
+     circ.UnitTest;
+     minh.UnitTest;
+     maxh.UnitTest;
+     prio.UnitTest;
 
      { Register timer-driven tasks }
      graphicsrefresh.init;