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/boot/uefi/main.c

@@ -20,6 +20,7 @@
 #include <ntlite/boot_info.h>
 #include <ntlite/memory_map.h>
 #include <common/ini_parser.h>
+#pragma intrinsic(_disable)
 
 int _fltused = 0;
 
@@ -287,6 +288,21 @@ static void DriversIniCb(const char* section, const char* key,
 // ---------------------------------------------------------------------------
 // EFI Memory Map -> MEMORY_MAP conversion
 // ---------------------------------------------------------------------------
+
+static EFI_PHYSICAL_ADDRESS AllocateApTrampolinePageBelow1M(void) {
+    // AP startup via SIPI requires the first instruction page to live below
+    // 1 MiB.  Some real UEFI firmware exposes no ConventionalMemory below
+    // 640 KiB after ExitBootServices, so reserve a loader-data page here while
+    // boot services can still satisfy AllocateMaxAddress.
+    EFI_PHYSICAL_ADDRESS phys = 0x0009F000ULL;
+    EFI_STATUS st = gBS->AllocatePages(AllocateMaxAddress, EfiLoaderData, 1, &phys);
+    if (EFI_ERROR(st) || phys == 0 || phys >= 0x000A0000ULL || (phys & 0xFFFULL)) {
+        return 0;
+    }
+    gBS->SetMem((VOID*)phys, PAGE_SIZE, 0);
+    return phys;
+}
+
 static void ConvertMemoryMap(MEMORY_MAP* out) {
     UINTN mapSize = 0, descSz = 0, mapKey; UINT32 descVer;
     gBS->GetMemoryMap(&mapSize, NULL, &mapKey, &descSz, &descVer);
@@ -738,6 +754,8 @@ EFI_STATUS EFIAPI UefiMain(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE* SystemTable
 
     //Print(L"7\n");
 
+    bi->ApTrampolinePhys = (uintptr_t)AllocateApTrampolinePageBelow1M();
+
     // --- Map physical RAM as direct window AND identity map ---
     UINTN mapSize = 0, descSz = 0, mapKey; UINT32 descVer;
     gBS->GetMemoryMap(&mapSize, NULL, &mapKey, &descSz, &descVer);
@@ -880,7 +898,7 @@ EFI_STATUS EFIAPI UefiMain(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE* SystemTable
     }
 
     // Print it out to verify the bootloader actually found it before launching the kernel
-    //Print(L"Found RSDP at: 0x%llx\n", bi->RsdpPhysical);
+    //Print(L"Found RSDP at: 0x%016llX\n", bi->RsdpPhysical);
 
     bi->PhysicalMapBase = PHYS_MAP_BASE;
     bi->Debug           = (UINT32)ps.debug;