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/drivers/storage/ide/ide.h

@@ -0,0 +1,102 @@
+// ide.h - shared IDE/ATA driver internals.
+#pragma once
+
+#include <stdint.h>
+#include <string.h>
+#include <intrin.h>
+#include <ntlite/ddi/io_driver.h>
+#include <ntlite/ddi/hal_api.h>
+#include <kernel/ke_debug.h>
+#include <kernel/ke_sched.h>
+#include <kernel/ke_irp.h>
+#include <kernel/ke_event.h>
+#include <kernel/ke_semaphore.h>
+#include <kernel/ke_thread.h>
+#include <kernel/ke_irq.h>
+#include <kernel/ke_dpc.h>
+#include <kernel/mm_phys.h>
+#include <kernel/mm_virt.h>
+
+// ---------------------------------------------------------------------------
+// IDE register map (primary channel, base 0x1F0)
+// ---------------------------------------------------------------------------
+#define IDE_DATA    0x1F0
+#define IDE_ERR     0x1F1
+#define IDE_SECCNT  0x1F2
+#define IDE_LBA0    0x1F3
+#define IDE_LBA1    0x1F4
+#define IDE_LBA2    0x1F5
+#define IDE_DRIVE   0x1F6
+#define IDE_STATUS  0x1F7
+#define IDE_CMD     0x1F7
+#define IDE_ALT     0x3F6
+
+#define IDE_BUSY    0x80
+#define IDE_READY   0x40
+#define IDE_ERR_F   0x01
+#define IDE_DRQ     0x08
+
+// ATA commands
+#define CMD_READ_EXT       0x24   // PIO  48-bit read
+#define CMD_WRITE_EXT      0x34   // PIO  48-bit write
+#define CMD_READ_DMA_EXT   0x25   // DMA  48-bit read
+#define CMD_WRITE_DMA_EXT  0x35   // DMA  48-bit write
+#define CMD_READ_DMA       0xC8   // DMA  28-bit read
+#define CMD_WRITE_DMA      0xCA   // DMA  28-bit write
+#define CMD_IDENT          0xEC
+
+// IDE primary IRQ
+#define IDE_IRQ_PRIMARY    14
+
+// ---------------------------------------------------------------------------
+// Bus Master IDE register offsets (relative to gBmBase, primary channel)
+// ---------------------------------------------------------------------------
+#define BM_CMD_REG     0x00   // command
+#define BM_STATUS_REG  0x02   // status
+#define BM_PRDT_REG    0x04   // PRDT physical address (32-bit)
+
+// BM_CMD_REG bits
+#define BM_CMD_START   0x01   // start DMA transfer
+#define BM_CMD_READ    0x08   // 1 = disk→memory (read), 0 = memory→disk (write)
+
+// BM_STATUS_REG bits
+#define BM_STATUS_ACTIVE  0x01   // DMA active
+#define BM_STATUS_ERROR   0x02   // DMA error (write 1 to clear)
+#define BM_STATUS_IRQ     0x04   // interrupt pending (write 1 to clear)
+
+// ---------------------------------------------------------------------------
+// Physical Region Descriptor (PRDT entry, 8 bytes)
+// The PRDT itself must not cross a 64 KB boundary and must be 4-byte aligned.
+// We allocate a full page so both constraints are trivially satisfied.
+// ---------------------------------------------------------------------------
+#pragma pack(push, 1)
+typedef struct {
+    uint32_t physAddr;   // physical base of this memory region
+    uint16_t byteCount;  // byte count; 0 means 64 KB
+    uint16_t flags;      // bit 15: End Of Table
+} PRD;
+#pragma pack(pop)
+
+#define PRD_EOT           0x8000u
+// 512 entries × 8 bytes = 4096 bytes = exactly one page; supports 512×64 KB = 32 MB
+#define PRDT_MAX_ENTRIES  512
+
+
+extern const HAL_API *gHal;
+extern DRIVER_OBJECT gDriver;
+extern DEVICE_OBJECT *gDevice;
+extern bool gDmaEnabled;
+extern uint64_t gSectorCount;
+extern bool gSupportsLba48;
+extern uint16_t gBmBase;
+extern PRD *gPrdtVirt;
+extern uint32_t gPrdtPhys;
+extern IRP_QUEUE gIrpQueue;
+extern SEMAPHORE *gIrpSemaphore;
+extern EVENT *gDmaEvent;
+extern KDPC gDmaDpc;
+
+void IdeDmaCompletionDpc(KDPC *dpc, void *context, void *systemArgument1, void *systemArgument2);
+void IdeIsr(void);
+void IdeWorker(uintptr_t arg);
+bool IdeDmaInit(void);