stos/amd64+hal: Add hpet init groundwork

Signed-off-by: Chloe M. <chloe@mensia.org>
2026-06-25 22:07:14 -05:00
parent 45dea1edb9
commit 686de4059f
5 changed files with 93 additions and 0 deletions
@@ -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);
+}