mem/vmap: add basic virtual memory management abstraction

1 files changed, 31 insertions, 0 deletions

diff --git a/mem/vmap.h b/mem/vmap.h
new file mode 100644
index 0000000..4e1816c
--- /dev/null
+++ b/mem/vmap.h
@@ -0,0 +1,31 @@
+#ifndef MEM_VMAP_H
+#define MEM_VMAP_H
+
+#include <rt.h>
+
+typedef struct mem_vmap MemVmap;
+
+typedef usize (*MemVmapTranslate)(MemVmap *, usize);
+typedef int (*MemVmapMap)(MemVmap *, usize, usize, usize, int);
+typedef int (*MemVmapUnmap)(MemVmap *, usize, usize);
+typedef void (*MemVmapSwitchTo)(MemVmap *);
+
+/* Structure abstracting the memory mapping facilities of
+   the machine */
+struct mem_vmap {
+	MemVmapTranslate translate;
+	MemVmapMap map;
+	MemVmapUnmap unmap;
+	MemVmapSwitchTo switch_to;
+
+	/* Flag indicating whether the previous translation
+	   lead to a miss */
+	int miss;
+};
+
+usize mem_vmap_translate(MemVmap *inner, usize virt);
+int mem_vmap_map(MemVmap *inner, usize phys, usize virt, usize len, int flags);
+void mem_vmap_unmap(MemVmap *inner, usize virt, usize len);
+void mem_vmap_switch_to(MemVmap *inner);
+
+#endif
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