move keyboard and mouse out of HAL into a standalone ps2.sys driver, implement usb stack with xhci controller discovery, hid keyboard/mouse, and bulk-only mass storage, add pci msi support with capability chain walking and software irq vector allocation (slots 16-23), rewrite user virtual memory as a USER_VA_REGION descriptor arena with per-process ownership tracking and guard page support, replacing the old bump allocator and top-down image region, add MmCreateUserRegion/MmDestroyAllUserRegions so process teardown reclaims all user va in one pass, allocate a pool-backed shadow framebuffer in hal_screen to fix cursor tearing and scroll corruption, reserve ap trampoline page below 1mb in uefi bootloader before boot services exit, rewrite memset/memcpy/memmove/memcmp with __stosq/__movsq intrinsics, promote driver flag literals to macros and add multi-tu STANDALONE_DRIVERS table to build.c, split rtl8139/rtl816x into header+source, rename KbReadScancode to KbReadKey, improve page fault output with MmDebugDescribeAddress and user region dump, fix %p to %016llX throughout.

code/kernel/hal/hal_main.c

@@ -5,12 +5,11 @@
 #include <stdint.h>
 #include <stdarg.h>
 #include <intrin.h>
+#pragma intrinsic(_disable)
 #include <common/printf.h>
 
-// Declared in other hal_*.c files:
-void HalScreenInitialize(uintptr_t fb, int w, int h, int stride, HAL_SCREEN* out);
-void HalKeyboardInitialize(HAL_KEYBOARD* out);
-void HalMouseInitialize(HAL_MOUSE* out, int screenW, int screenH);
+void HalScreenInitialize(void* (*AllocatePool)(size_t size), uintptr_t fb, int w, int h, int stride,
+                        HAL_SCREEN* out);
 KSTATUS HalTimerInitialize(uintptr_t lapicPhys, uintptr_t hpetPhys, HAL_TIMER *out);
 void HalPciInitialize(HAL_PCI* out);
 extern void HalSetDebugEnabled(int v);
@@ -242,7 +241,7 @@ static void ParseMadt(MADT* madt) {
             uint32_t lapicId = *(uint32_t *)(p + 4);
             uint32_t flags = *(uint32_t *)(p + 8);
             uint32_t uid = *(uint32_t *)(p + 12);
-            if ((flags & 1u) && lapicId < 256u)
+            if (flags & 1u)
                 HalAddCpuRecord(uid, lapicId, flags);
         }
 
@@ -395,7 +394,7 @@ __declspec(dllexport) KSTATUS HalInitialize(const HAL_INIT_PARAMS* initParams) {
     debugEnabled = initParams->Debug;
 
     // Screen first so DbgPrint works immediately.
-    HalScreenInitialize(initParams->FramebufferBase + initParams->PhysicalWindowBase,
+    HalScreenInitialize(initParams->AllocatePool, initParams->FramebufferBase + initParams->PhysicalWindowBase,
                         (int)initParams->FramebufferWidth,
                         (int)initParams->FramebufferHeight,
                         (int)initParams->FramebufferStride,
@@ -412,10 +411,9 @@ __declspec(dllexport) KSTATUS HalInitialize(const HAL_INIT_PARAMS* initParams) {
             gLapicPhys, gIoapicPhys, gHpetPhys);
 
     HalApicInitialize(gLapicPhys, gIoapicPhys);
-    HalKeyboardInitialize(&gApi.Keyboard);
-    HalMouseInitialize(&gApi.Mouse,
-                       (int)initParams->FramebufferWidth,
-                       (int)initParams->FramebufferHeight);
+    HalDbgPrint("HAL: local APIC mode=%s BSP_ID=%u\n",
+                HalApicUsingX2Apic() ? "x2APIC" : "xAPIC",
+                HalGetBspLapicId());
 
     KSTATUS ts = HalTimerInitialize(gLapicPhys, gHpetPhys, &gApi.Timer);
     if (!KSUCCESS(ts)) HalDbgPrint("HAL: HPET unavailable, using fallback\n");