Basic VM and other minor improvements.

Not complete, probably not fully debugged or optimized.

include/sys/mman.h

@@ -0,0 +1,29 @@
+
+#ifndef _MMAN_H
+#define _MMAN_H
+
+#ifndef _TYPES_H
+#include <sys/types.h>
+#endif
+
+/* prot argument for mmap() */
+#define PROT_NONE       0x00    /* no permissions */
+#define PROT_READ       0x01    /* pages can be read */
+#define PROT_WRITE      0x02    /* pages can be written */
+#define PROT_EXEC       0x04    /* pages can be executed */
+
+/* flags argument for mmap()  */
+#define MAP_SHARED      0x0001          /* share changes */
+#define MAP_PRIVATE     0x0002          /* changes are private */
+#define MAP_ANON	0x0004          /* anonymous memory */
+#define MAP_PREALLOC	0x0008		/* not on-demand */
+#define MAP_CONTIG	0x0010		/* contiguous in physical memory */
+#define MAP_LOWER16M	0x0020		/* physically below 16MB */
+
+/* mmap() error return */
+#define MAP_FAILED      ((void *)-1)
+
+_PROTOTYPE( void *mmap, (void *, size_t, int, int, int, off_t));
+_PROTOTYPE( int munmap, (void *, size_t));
+
+#endif /* _MMAN_H */