Initial revision

src/arch/i386/include/segoff.h

@@ -0,0 +1,41 @@
+/*
+ * Segment:offset types and macros
+ *
+ * Initially written by Michael Brown (mcb30).
+ */
+
+#ifndef SEGOFF_H
+#define SEGOFF_H
+
+#include <stdint.h>
+#include <osdep.h>
+#include <io.h>
+
+/* Segment:offset structure.  Note that the order within the structure
+ * is offset:segment.
+ */
+typedef struct {
+	uint16_t offset;
+	uint16_t segment;
+} segoff_t;
+
+/* Macros for converting from virtual to segment:offset addresses,
+ * when we don't actually care which of the many isomorphic results we
+ * get.
+ */
+#ifdef DEBUG_SEGMENT
+uint16_t SEGMENT ( const void * const ptr ) {
+	uint32_t phys = virt_to_phys ( ptr );
+	if ( phys > 0xfffff ) {
+		printf ( "FATAL ERROR: segment address out of range\n" );
+	}
+	return phys >> 4;
+}
+#else
+#define SEGMENT(x) ( virt_to_phys ( x ) >> 4 )
+#endif
+#define OFFSET(x) ( virt_to_phys ( x ) & 0xf )
+#define SEGOFF(x) { OFFSET(x), SEGMENT(x) }
+#define VIRTUAL(x,y) ( phys_to_virt ( ( ( x ) << 4 ) + ( y ) ) )
+
+#endif /* SEGOFF_H */