stos/amd64+hal: Add hpet init groundwork

Signed-off-by: Chloe M. <chloe@mensia.org>

paw/stos/arch/amd64/platform/board.c

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: Board initialization
+ * Author:      Chloe M.
+ */
+
+#include <hal/board.h>
+#include <machine/hpet.h>
+
+VOID
+HalBoardInit(VOID)
+{
+    MdHpetInit();
+}

paw/stos/arch/amd64/platform/hpet.c

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: HPET driver
+ * Author:      Chloe M.
+ */
+
+#include <machine/hpet.h>
+#include <drivers/acpi/tables.h>
+#include <drivers/acpi/acpi.h>
+#include <ke/knot.h>
+#include <ex/trace.h>
+
+#define DTRACE(Fmt, ...) \
+    TRACE("[ HPET ]: " Fmt, ##__VA_ARGS__)
+
+VOID
+MdHpetInit(VOID)
+{
+    ACPI_HPET *Hpet;
+
+    Hpet = AcpiQuery("HPET");
+    if (Hpet == NULL) {
+        KeKnot(
+            KNOT_UNBOUND_RSRC,
+            "could not detect HPET on this platform\n"
+        );
+    }
+
+    /* Some informational logging */
+    DTRACE("detected hpet with pci vendor id : %x\n", Hpet->PciVendorId);
+    DTRACE("counter size : %d\n", Hpet->CounterSize);
+    DTRACE("minimum tick : %d\n", Hpet->MinimumTick);
+}

paw/stos/head/arch/amd64/hpet.h

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: HPET driver
+ * Author:      Chloe M.
+ */
+
+#ifndef _MACHINE_HPET_H_
+#define _MACHINE_HPET_H_ 1
+
+#include <stdef.h>
+
+/*
+ * Initialize the HPET timer
+ */
+VOID MdHpetInit(VOID);
+
+#endif  /* !_MACHINE_HPET_H_ */

paw/stos/head/hal/board.h

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description:  Board management
+ * Author:       Chloe M.
+ */
+
+#ifndef _HAL_BOARD_H_
+#define _HAL_BOARD_H_ 1
+
+#include <stdef.h>
+
+/*
+ * Initialize board specifics
+ */
+VOID HalBoardInit(VOID);
+
+#endif  /* !_HAL_BOARD_H_ */

paw/stos/init/init.c

@@ -13,6 +13,7 @@
 #include <ke/bpal.h>
 #include <hal/serial.h>
 #include <hal/kpcr.h>
+#include <hal/board.h>
 #include <ob/object.h>
 #include <drivers/bootvid/fbio.h>
 #include <drivers/acpi/acpi.h>
@@ -82,4 +83,7 @@ KiKernelEntry(VOID)
 
     /* Initialize the object manager */
     ObInitManager();
+
+    /* Initialize the board */
+    HalBoardInit();
 }