mos: mm: Add mm/vmm.h virtual memory header

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 25 insertions, 0 deletions

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_ */