From 9745c926f83d548e790bfd10878f5a8ca31089b7 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Mon, 22 Dec 2025 20:02:25 -0500
Subject: mos: mm: Add mm/vmm.h virtual memory header

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 mos/sys/inc/mm/vmm.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 mos/sys/inc/mm/vmm.h

diff --git a/mos/sys/inc/mm/vmm.h b/mos/sys/inc/mm/vmm.h
new file mode 100644
index 0000000..b4bc500
--- /dev/null
+++ b/mos/sys/inc/mm/vmm.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2025, Ian Moffett.
+ * Provided under the BSD-3 clause.
+ */
+
+
+#ifndef _MM_VMM_H_
+#define _MM_VMM_H_ 1
+
+#include <sdk/param.h>
+#include <kern/bpt.h>
+
+/* Machine pagesize */
+#define PAGESIZE 4096
+
+/*
+ * Macros to convert virtual addresses to physical and
+ * vice versa.
+ */
+#define vma_to_pma(VMA)         \
+    PTR_NOFFSET((UPTR)(VMA), bpt_kernel_base())
+#define pma_to_vma(PMA)         \
+    (void *)PTR_OFFSET((PMA), bpt_kernel_base())
+
+#endif  /* !_MM_VMM_H_ */
-- 
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